CN113824506B - Optical signal processing method, optical transceiver, controller and optical line terminal - Google Patents

Abstract

Embodiments of the present disclosure relate to an optical signal processing method, an optical transceiver, a controller, and an optical line terminal. The optical line terminal includes an optical transceiver and a controller. The optical transceiver includes a receiver, the receiver including: a light detector configured to receive an optical signal from an optical network unit; and an amplifier coupled with the light detector and configured to receive an indication signal from the controller for indicating an operating mode of the controller and to adjust a light processing parameter of the receiver for the light signal based on the indication signal. The controller includes: a first signal generator configured to generate the indication signal and provide the indication signal to the optical transceiver. According to the scheme of the embodiment of the disclosure, the stability and the accuracy of the optical receiving process of the optical line terminal side can be ensured. In addition, the design complexity of the optical transceiver, especially the amplifier, can be reduced, and the high integration of the optical line terminal is promoted.

Description

Optical signal processing method, optical transceiver, controller and optical line terminal

technical field

Embodiments of the present disclosure relate to the field of optical communications, and more specifically relate to receiving and processing of optical signals at an optical line terminal (OLT: Optical Line Terminal).

Background technique

Currently, the mainstream optical fiber access method is a passive optical network (PON: Passive Optical Network) system. The PON system includes an OLT at the central office and an Optical Network Unit (ONU: Optical Network Unit) at the terminal side. An OLT can receive time-division multiplexed (TDMA: Time Division Multiple Access) optical signals from multiple ONUs, which is also called upstream light. Since the optical signals from each ONU may have differences in amplitude and time length, how to quickly adjust the optical processing parameters of the OLT for these optical signals so as to correctly process and identify these optical signals has always been a research hotspot in this field.

Usually, when the ONU is powered on, it needs to interact with the OLT to complete the registration and online, and normal data transmission and reception can only be performed after the registration and online. However, in the process of registering and going online, because the OLT cannot predict when the ONU will be powered on, that is, the moment when the upstream light arrives, the OLT may not be able to adjust the optical processing parameters at the right time, and sometimes even fail to start the optical processing. Parameter adjustment, so that the uplink light from the ONU cannot be correctly processed and identified, and even cannot be registered online.

Contents of the invention

In general, embodiments of the present disclosure provide an improved light reception processing scheme at the OLT.

According to a first aspect of an embodiment of the present disclosure, an optical signal processing method implemented at an optical transceiver is provided. The method includes: the optical transceiver receives an optical signal from an optical network unit; the optical transceiver receives an indication signal from a controller, and the indication signal is used to indicate the working mode of the controller; and based on the indication signal , the optical transceiver adjusts an optical processing parameter of a receiver in the optical transceiver for the optical signal.

According to a second aspect of the embodiments of the present disclosure, an optical signal processing method implemented at a controller is provided. The method includes: a controller generating an indication signal, the indication signal indicating an operating mode of the controller; and the controller providing the indication signal to an optical transceiver, so that the optical transceiver is based on the indication signal Adjusting optical processing parameters of a receiver of the optical transceiver.

According to a third aspect of the embodiments of the present disclosure, an optical transceiver is provided. The optical transceiver includes: a receiver configured to receive an optical signal from an optical network unit; and an amplifier coupled to the receiver and configured to: receive an indication signal from a controller, the indication signal used to indicate the working mode of the controller; and based on the indication signal, adjust an optical processing parameter of the receiver for the optical signal.

According to a fourth aspect of the embodiments of the present disclosure, a controller is provided. The controller includes: a first signal generator configured to: generate an indication signal indicating the working mode of the controller; and provide the indication signal to an optical transceiver, so that the optical transceiver The controller adjusts an optical processing parameter of a receiver in the optical transceiver based on the indication signal.

According to a fifth aspect of the embodiments of the present disclosure, an optical line terminal is provided. The optical line terminal comprises the optical transceiver according to the third aspect and the controller according to the fourth aspect.

It will be understood from the description of the example embodiments below that according to the technical solution proposed herein, the stability and accuracy of the light receiving process at the OLT side during the ONU registration and online period can be ensured. In addition, it can reduce the complexity of the light receiving process on the OLT side, and promote the high integration of the OLT.

It should be understood that the content described in the Summary of the Invention is not intended to limit the key or important features of the embodiments of the present disclosure, nor is it intended to limit the scope of the present disclosure. Other features of the present disclosure will be readily understood through the following description.

Description of drawings

The above and other features, advantages and aspects of the various embodiments of the present disclosure will become more apparent with reference to the following detailed description when taken in conjunction with the accompanying drawings. In the drawings, identical or similar reference numerals denote identical or similar elements, wherein:

Figure 1 shows a schematic diagram of an example communication system in which embodiments of the present disclosure may be implemented;

Fig. 2 shows a schematic diagram of the light receiving process at the OLT side according to the conventional scheme;

Fig. 3 shows a schematic structural block diagram of an optical line terminal according to an embodiment of the present disclosure;

FIG. 4 shows a flowchart of an optical signal processing method according to an embodiment of the present disclosure;

FIG. 5 shows a flowchart of a method of adjusting light processing parameters according to an embodiment of the present disclosure; and

Fig. 6 shows a flowchart of an optical signal processing method according to an embodiment of the present disclosure.

detailed description

Embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although certain embodiments of the present disclosure are shown in the drawings, it should be understood that the disclosure may be embodied in various forms and should not be construed as limited to the embodiments set forth herein; A more thorough and complete understanding of the present disclosure. It should be understood that the drawings and embodiments of the present disclosure are for exemplary purposes only, and are not intended to limit the protection scope of the present disclosure.

As used herein, the term "comprise" and its variants are inclusive, ie "including but not limited to". The term "based on" is "based at least in part on". The term "one embodiment" means "at least one embodiment"; the term "another embodiment" means "at least one further embodiment". Relevant definitions of other terms will be given in the description below.

It should be understood that although the terms "first" and "second", etc. may be used herein to describe various elements, these elements should not be limited by these terms. These terms are only used to distinguish one element from another. For example, a first element could be termed a second element, and similarly, a second element could be termed a first element, without departing from the scope of the embodiments. As used herein, the term "and/or" includes any and all combinations of one or more of the listed items.

As used herein, the term "circuitry" means one or more of the following:

(a) only hardware circuit implementations (such as only analog and/or digital circuit implementations); and

(b) combinations of hardware circuitry and software, such as (if applicable): (i) combinations of analog and/or digital hardware circuitry and software/firmware, and (ii) any portion of a hardware processor combined with software (including digital signal processors, software, and memory that enable devices such as optical line terminals (OLTs) or other computing devices to perform various functions); and

(c) A hardware circuit and/or processor, such as a microprocessor or a portion thereof, that requires software (eg, firmware) to operate, but may be without software when not required to operate.

The definition of electrical circuit applies to all uses of this term in this application, including in any claims. As a further example, the term 'circuitry' as used herein also covers an implementation of merely a hardware circuit or processor (or multiple processors), or a portion thereof, or its accompanying software or firmware. For example, the term "circuitry" also covers a baseband integrated circuit or a processor integrated circuit or similar integrated circuits in an OLT or other computing device, if applicable to a particular claim element.

As used herein, the term "communication system" may be a PON-based communication system, for example, a gigabit passive optical network (G-PON: Gigabit-Capable Passive Optical Network), a 10 gigabit passive optical network (XG-PON: 10-Gigabit-Capable Passive Optical Network), 10 Gigabit Symmetrical Passive Optical Network (XGS-PON: 10-Gigabit-Capable Symmetric Passive Optical Network), 50 Gigabit Passive Optical Network (50G-PON: 50-Gigabit- Capable Passive Optical Network), etc. The communication system may also be any wired or wireless communication system capable of implementing embodiments of the present disclosure. Considering the rapid development of communication technology, there will certainly be future types of communication technology and systems, with which the present invention may be combined. It should not be taken as limiting the scope of the present disclosure to only the systems described above.

FIG. 1 shows a schematic diagram of an example communication system 100 in which embodiments of the present disclosure may be implemented. As shown in FIG. 1 , the system 100 may be a PON system, and the PON system includes ONUs 111 , 112 and 113 (for convenience, they may also be collectively referred to as ONU 110 below) and an OLT 120 . ONUs 111 , 112 and 113 may communicate with OLT 120 via optical splitter 130 . It should be understood that the number of ONUs 110 is not limited to the example shown in Figure 1, but may include more or less numbers, and the number of OLTs 120 is not limited to the example shown in Figure 1, but may include more many. Furthermore, their implementation is not limited to the specific examples described above, but may be implemented in any suitable manner.

The PON system 100 shown in FIG. 1 includes downlink transmission and uplink transmission. Downstream transmission refers to data transmission from OLT 120 to ONU 110 (also referred to as optical signal transmission herein), and upstream transmission refers to data transmission from ONU 110 to OLT 120 . Usually, the downlink transmission is to transmit data in a broadcast manner. At the OLT 120 , the downstream data flow is encapsulated into an Ethernet packet, and a corresponding identifier (ID: Identity) is appended, and the ONUs 111 , 112 and 113 are associated with different IDs. At the optical splitter 130, the downstream data flow will be divided into three groups and broadcast to each branch, so all the ONUs 111, 112 and 113 will receive the same data. After receiving the data sent by the OLT 120, the ONUs 111, 112 and 113 judge whether to process or discard the data flow according to the ID. For example, data streams with IDs associated with them are processed, while data streams with IDs not associated with them are discarded, and vice versa. It should be pointed out here that the number of groups into which the downstream data flow is divided may be associated with the number of corresponding ONUs. The number of groups is not limited to the above specific example number, but may be more or less.

Uplink transmission is the transmission of optical signals through TDMA. For example, when the ONUs 111, 112 and 113 are successfully registered and online, the OLT 120 will allocate specific bandwidths to the ONUs 111, 112 and 113 according to configuration information such as data service types, that is, time slots allocated during data transmission, for data transmission . The ONUs 111, 112 and 113 perform data transmission when their respective time slots arrive, and send data in sequence, avoiding uplink data conflicts. The corresponding optical signals sent by the ONUs 111 , 112 and 113 in their respective time slots are aggregated by the optical splitter 130 to form a time-division multiplexed optical signal, and the optical signal is sent to the OLT 120 .

Since the service types of each ONU 110 and the distance from the OLT 120 are usually different, the optical signals from each ONU 110 also have differences in amplitude and time length. Therefore, how to restore the optical signal of each ONU 110 from the received optical signal at the OLT 120 has always been a research hotspot that has attracted much attention.

Generally, the OLT 120 may include two working modes: a windowing mode and a data transceiving mode. In the windowing mode, the OLT120 can allocate a specific time slot for the ONU to go online, so as to receive the optical signal from the ONU, and perform ranging processing, so as to complete the registration and go online. The OLT 120 can switch to the windowing mode every predetermined time, so as to discover new ONUs to go online and incorporate them into the PON system. After the ONU is registered and online, the OLT 120 can enter the data sending and receiving mode to perform normal data sending and receiving.

As shown in FIG. 1 , the OLT 120 may include an optical transceiver 121 and a controller 122 . The optical transceiver 121 may include a transmitter 141 and a receiver 142 . It should be understood that the OLT 120 and the optical transceiver 121 may also include other additional modules, and are not limited to the examples here. The transmitter 141 is used to convert the transmission data from the controller 122 to be transmitted to the ONU 110 into a downlink optical signal, and provide it to the ONU 110 through the optical splitter 130 . The receiver 142 is used for receiving the upstream optical signal from the ONU 110 and converting the upstream optical signal into an electrical signal, and then providing it to the controller 122 .

However, in the windowing mode, since the controller cannot predict the arrival time of the ONU's upstream light, it is usually impossible to reset the receiver at an appropriate time in the traditional solution. This will be described in detail below in conjunction with FIG. 2 .

FIG. 2 shows a schematic diagram of a light reception processing procedure on the OLT 200 side according to a conventional scheme. As shown in FIG. 2 , the OLT 200 may include a receiver 210 and a controller 220 of an optical transceiver. For simplicity, the transmitter of the optical transceiver is not shown here. The receiver 210 may include a photodetector 201 , a transimpedance amplifier (TIA: Trans-Impedance Amplifier) 202 and a limiting amplifier (LA: Limiting Amplifier) 203 . The optical signal from the ONU 110 can be converted into a current signal through the photodetector 201, and the current signal can be converted into a voltage signal through the TIA 202 and amplified. The amplified voltage signal can be converted into a standard digital level signal through the LA 203 , and the standard digital level signal is output to the controller 220 as the received data output RX of the optical transceiver 310 .

Traditionally, for the problem that the controller 220 cannot predict the arrival time of the uplink light, the LA 203 is designed to output the detection signal SD and provide it to the controller 220 when the light detector 201 detects the light signal, so that the controller 220 can know Receiver 210 has received the optical signal. Upon receiving the detection signal SD, the controller 220 may send a reset signal RESET to the receiver 210 for resetting the receiver 210 . However, in order to reduce the design difficulty of the TIA 202, in some cases, the TIA 202 will be designed to work based on the reset signal. In still some cases, LA 203 can also be designed to work based on the reset signal RESET. In the data transceiving mode, the controller 220 can determine the specific arrival time of the ONU upstream light according to the dynamic bandwidth allocation (DBA:DynamicBandwidth Allocation) information, and then can output the reset signal RESET at an appropriate time, so that the TIA 202 and LA 203 can be based on The reset signal RESET works normally. However, in the window opening mode, the controller 220 cannot predict the arrival time of the ONU upstream light, and thus cannot provide the reset signal RESET. This will cause the TIA 202 and LA 203 to fail to work normally, and thus fail to provide the detection signal SD to the controller 220 . In the absence of the detection signal SD, the controller 220 cannot output the reset signal RESET, resulting in an endless loop.

In view of the points to be improved in the known solutions, the embodiments of the present disclosure propose an improved light receiving processing solution. Generally speaking, according to the technical solution proposed here, the operating mode of the controller is notified to the optical transceiver, so that the optical transceiver can timely adjust the optical processing parameters of the receiver based on the operating mode, thereby ensuring the processing of optical signals . For ease of understanding, various exemplary embodiments of the present disclosure are described in detail below with reference to FIGS. 3 to 6 .

Fig. 3 shows a schematic structural block diagram of an OLT 300 according to an embodiment of the present disclosure. The OLT 300 may be implemented as or a part of the OLT 120 of FIG. 1 . It should be understood that the OLT 300 may include other additional components not shown or omit some components shown therein, which is not limited in this embodiment of the present disclosure.

As shown in FIG. 3 , the OLT 300 includes an optical transceiver 310 and a controller 320 . The optical transceiver 310 may be implemented as or as part of the optical transceiver 121 of FIG. 1 . The controller 320 may be implemented as or a part of the controller 122 of FIG. 1 . For convenience, description will be made below in conjunction with the example system shown in FIG. 1 . However, it should be understood that the embodiments of the present disclosure can also be used in other suitable environments or systems known at present or developed in the future.

As shown in FIG. 3 , the optical transceiver 310 may include a receiver 311 . The optical transceiver 310 may include other unshown additional components, which are not limited in this embodiment of the present disclosure. Receiver 311 may be implemented as or part of receiver 142 of FIG. 1 . The receiver 311 may include a light detector 331 and an amplifier 332 . It should be understood that the receiver 311 may include other additional components not shown or some components shown therein may be omitted, which is not limited in this embodiment of the present disclosure.

The photodetector 331 is configured to receive an optical signal from the ONU 110 . In some embodiments, the photodetector 331 can further convert the received light signal into a current signal, and provide the current signal to the amplifier 332 coupled to the photodetector 331 . The amplifier 332 is configured to receive an indication signal MODE from the controller 320 , the indication signal MODE is used to indicate the working mode of the controller 320 . In this way, the amplifier 332 can know the working mode of the controller 320 in real time, so as to adjust its operation appropriately.

The working mode of the controller 320 may be a windowing mode or a data sending and receiving mode. In the context of the present disclosure, "window mode" means that the controller 320 allocates specific time slots for ONUs to go online, so as to receive optical signals from the ONUs and perform ranging processing, thereby completing the registration and online of these ONUs. "Data transceiving mode" means that the controller 320 allocates a specific bandwidth to the registered online ONU according to the system configuration, so as to perform data transmission. Of course, the embodiments of the present disclosure are not limited thereto, and the controller 320 may also include other existing or future developed working modes.

In some embodiments, the amplifier 332 may receive the indication signal from the controller 320 via the first input and output terminal of the optical transceiver 310 . In some embodiments, the first input and output terminals may be one or more pins. Of course, other forms of the first input and output terminals are also feasible. In some embodiments, the first input and output terminal may be dedicated to receiving the indication signal MODE, as shown in FIG. 3 . In this manner, accurate reception of the indication signal MODE is facilitated.

In some alternative embodiments, the first input and output terminal may be a terminal multiplexed with other signals. For example, the indication signal MODE can share one terminal with the reset signal RESET. As another example, the indication signal MODE may share a terminal with the rate selection signal (not shown in the figure). It should be pointed out here that the embodiments of the present disclosure are not limited thereto, but the indication signal MODE may be multiplexed with any other one or more suitable signals on one terminal. Through the multiplexing of terminals, changes to the hardware structure of the optical transceiver can be reduced, reducing costs.

The amplifier 332 is further configured to adjust an optical processing parameter of the receiver 311 for the optical signal based on the indication signal MODE. In some embodiments, the amplifier 332 can determine the working mode of the controller 320 based on the indication signal MODE, and adjust the light processing parameters for the light signal based on the working mode. In some embodiments, the characteristic of the indication signal MODE is used to indicate the working mode of the controller 320 . For example, the characteristic of the indication signal MODE may be the amplitude, frequency, phase, etc. of the signal. It should be understood that the above examples of features are illustrative only and not limiting, and that other suitable features are possible.

In some embodiments, when the indication signal MODE is at the first level, the amplifier 332 can determine that the working mode of the controller 122 is the windowing mode, and when the indication signal MODE is at the second level different from the first level, the amplifier 332 332 may determine that the working mode of the controller 122 is the data sending and receiving mode. For example, the first level and the second level may differ in at least one of amplitude, frequency and phase.

In some embodiments, the first level and the second level have different amplitude values. For convenience of description, the amplitude value of the first level is referred to as "first amplitude value" and the amplitude value of the second level is referred to as "second amplitude value" below. The first amplitude value can be larger or smaller than the second amplitude value.

Alternatively or additionally, in some embodiments the first level and the second level have different durations. For convenience of description, the duration of the first level is referred to as "first duration" and the duration of the second level is referred to as "second duration" hereinafter. The first duration can be greater than or less than the second duration. It should be understood that the above-mentioned embodiments are only examples, and the embodiments of the present disclosure are not limited thereto, and any other suitable manners are feasible.

If the indication signal MODE indicates that the working mode of the controller 320 is the windowing mode, the amplifier 332 can adjust the light processing parameters in various ways. For example, in some embodiments, amplifier 332 may adjust light processing parameters by adjusting a gain parameter. Alternatively or additionally, the amplifier 332 can also adjust the bias voltage. As another example, in some examples, the bias voltage of the coupling capacitor can be adjusted, the DC bias can be eliminated, and so on. Note that these adjustment means can be used alone or in any combination.

As an example, amplifier 332 may be implemented to include a preamplifier and a postamplifier. The pre-amplifier may include, for example, TIA, and the post-amplifier may include, for example, LA. In these embodiments, the amplifier 332 can adjust the gain parameter and the bias voltage of the preamplifier according to the intensity of the current signal output by the photodetector 331 . In this way, it is possible to quickly adjust the DC decision voltage and select an appropriate gain to generate an amplified voltage signal. In turn, the amplifier 332 can adjust the coupling capacitor voltage of the post-amplifier and remove the DC bias. Thus, the amplified voltage signal can be converted into a standard digital level signal, and output as the received data of the optical transceiver 310 RX. As an example only, the standard digital level signal can conform to such as current mode logic (CML: Current Mode Logic), positive emitter coupled logic (PECL: PositiveEmitter-Couple Logic), low voltage differential signal (LVDS: Low Voltage DifferentialSignal) Various standard digital level formats of the class. It should be understood that these are examples only, and not limiting. The standard digital level signal may conform to any other standard digital level format known in the art or determined in the future.

It should be noted here that the structure of the amplifier 332 is not limited to the above example, but can be implemented in any other suitable manner. Correspondingly, the operation of adjusting the light processing parameter is not limited to the above example, and any other suitable operation is also feasible.

Through the above adjustment of the optical processing parameters based on the indication signal, correct processing of the ONU optical signal can be realized even in the windowing mode. Thereby, the occurrence of the above-mentioned infinite loop can be avoided, and the registration and online of the ONU can be ensured. In addition, since the optical transceiver can know the current working mode in time, the design complexity of the optical transceiver, especially the amplifier, can be reduced. Furthermore, the size of the optical transceiver can be reduced, which facilitates the high integration of the OLT.

In some alternative embodiments, if the indication signal MODE indicates that the working mode of the controller 320 is the windowing mode, the amplifier 332 can directly reset the receiver 311 without the reset signal RESET from the controller 320 . In some embodiments, the amplifier 332 can autonomously generate a reset signal to directly reset the receiver 311 . Of course, any other suitable manner can also be used to directly reset the receiver 311 . Resetting the receiver 311 refers to adjusting the light processing parameters of the receiver 311 to a predetermined value. In some embodiments, the predetermined value may be predetermined. In some other embodiments, the predetermined value may be dynamically determined according to needs. Regarding the specific implementation of reset, the embodiment of the present disclosure does not make any limitation. In this way, the adjustment of light processing parameters can be realized more simply and quickly.

In some embodiments, after the above-mentioned optical processing parameters are adjusted, the amplifier 332 can provide the converted standard digital level signal as the received data output RX to the controller 320 for further processing. Additionally or alternatively, the amplifier 332 can also output a detection signal SD to the controller 320 for indicating that the optical transceiver 310 has received an optical signal. Further, the amplifier 332 may receive a reset signal RESET from the controller 320 , which is generated based on the detection signal SD and used to instruct the receiver 311 to be reset. In this way, the receiver 311 can subsequently be brought into normal operation.

In some embodiments, if the indication signal MODE indicates that the working mode of the controller 320 is the data transceiving mode, the amplifier 332 can reset the receiver 311 based on the reset signal RESET from the controller 320 . In this way, the receiver 311 can process the optical signal from the ONU 110 for data transmission.

Also referring to FIG. 3 , the controller 320 may include a first signal generator 321 . The first signal generator 321 is configured to generate the indication signal MODE. In some embodiments, the first signal generator 321 can determine whether the working mode of the controller 320 is the window opening mode or the data transceiving mode, and generate an indication signal MODE to indicate the working mode. For example, in some embodiments, if the working mode of the controller 320 is switched from the data transceiving mode to the windowing mode, the first signal generator 321 may generate an indication signal MODE to indicate that the working mode is the windowing mode. If the working mode of the controller 320 is switched from the window opening mode to the data transmitting and receiving mode, an indication signal MODE is generated to indicate that the working mode is the data transmitting and receiving mode. In this way, the generation of the indication signal MODE can be realized conveniently.

In some embodiments, the first signal generator 321 can indicate the working mode of the controller 320 through the characteristic of the indicating signal MODE. For example, the characteristic of the indication signal MODE may be the amplitude, frequency, phase, etc. of the signal. It should be understood that the above examples of features are illustrative only and not restrictive, and that other suitable features are possible.

In some embodiments, if it is determined that the working mode of the controller 320 is the windowing mode, the first signal generator 321 may generate an indication signal MODE with a first level to indicate the windowing mode. If it is determined that the working mode of the controller 320 is the data transceiving mode, the first signal generator 321 may generate an indication signal MODE having a second level different from the first level to indicate the data transceiving mode. For example, the first level and the second level may differ in at least one of amplitude, frequency and phase.

Following the previous example, the first level has a first amplitude value and a first duration, and the second level has a second amplitude value and a second duration. In some embodiments, the first amplitude value of the first level may be greater than the second amplitude value of the second level. Alternatively, the first amplitude value may be made smaller than the second amplitude value. In some alternative or additional embodiments, the first duration of the first level may be made longer than the second duration of the second level. Of course, it is also feasible that the first duration is shorter than the second duration. The above-mentioned embodiments are only examples, and the embodiments of the present disclosure are not limited thereto, and any other suitable features or combinations of features are feasible.

The first signal generator 321 may also be configured to provide the indication signal MODE to the optical transceiver 310 . In some embodiments, the first signal generator 321 can provide the indication signal MODE to the optical transceiver 310 via the second input and output terminal of the controller 320 . In some embodiments, the second input and output terminals may be one or more pins. It should be understood that other forms of the second input and output terminals are also feasible. In some embodiments, the second input and output terminal may be dedicated to providing the indication signal MODE, as shown in FIG. 3 . In this way, accurate provision of the indication signal MODE can be facilitated.

In some alternative embodiments, the second input-output terminal may be a terminal multiplexed with other signals. For example, the indication signal MODE can share one terminal with the reset signal RESET. As another example, the indication signal MODE may share a terminal with the rate selection signal (not shown in the figure). It should be understood that the embodiments of the present disclosure are not limited thereto, but the indication signal MODE may be multiplexed with any other one or more suitable signals on one terminal. Through the multiplexing of terminals, changes to the hardware structure of the controller can be reduced, reducing costs.

Additionally, the controller 320 may also include a second signal generator (not shown in the figure). The second signal generator may be configured to receive the detection signal SD from the optical transceiver 310, and generate a reset signal RESET based on the detection signal SD. In addition, the second signal generator can provide the reset signal RESET to the optical transceiver 320 for resetting the receiver 311 of the optical transceiver 310 .

According to the above manner, by notifying the optical transceiver 310 of the working mode of the controller 320 , the controller 320 can obtain the ONU optical signal accurately processed by the optical transceiver 310 . In this way, the stability and accuracy of OLT-side optical signal processing can be improved. In addition, it can reduce the complexity of the light receiving process on the OLT side, and promote the high integration of the OLT. Correspondingly, the embodiments of the present disclosure further provide an optical signal processing method implemented at the optical transceiver and at the controller, which will be described below with reference to FIG. 4 to FIG. 6 .

FIG. 4 shows a flowchart of an optical signal processing method 400 according to an embodiment of the present disclosure. The method may be implemented at an optical transceiver (such as the optical transceiver 121 of FIG. 1 or the optical transceiver 310 of FIG. 3 ) at the OLT side, such as the receiver 142 of FIG. 1 or the receiver 311 of FIG. 3 . For convenience, FIG. 4 will be described below in conjunction with the example in FIG. 3 . It should be understood that the method in FIG. 4 may include other additional steps not shown, or some steps shown may be omitted. The scope of the present disclosure is not limited thereto.

As shown in FIG. 4 , at block 401 , the optical transceiver 310 receives an optical signal from the ONU 110 . In some embodiments, optical transceiver 310 may receive time-multiplexed optical signals from multiple ONUs 110 . But the embodiments of the present disclosure are not limited thereto. In some alternative embodiments, optical transceiver 310 may also receive optical signals from a single ONU 110 .

At block 402 , the optical transceiver 310 receives an indication signal MODE from the controller 320 , the indication signal MODE is used to indicate the working mode of the controller 320 . In some embodiments, the working modes of the controller 320 may include a window opening mode and a data transceiving mode. The windowing mode means that the controller allocates a specific time slot for the ONU to be online, so as to receive the optical signal from the ONU, and perform ranging processing, so as to complete the registration and online of these ONUs. The data sending and receiving mode refers to that the controller 320 allocates a specific bandwidth to the registered online ONU according to the system configuration, so as to perform data transmission. It should be understood that the embodiments of the present disclosure are not limited thereto, and the controller 320 may also include other existing or future developed working modes.

According to some embodiments of the present disclosure, the optical transceiver 310 may receive an indication signal from the controller 320 via the first input and output terminal of the optical transceiver 310 . In some embodiments, the first input and output terminals may be one or more pins. Of course, other forms of the first input and output terminals are also feasible. In some embodiments, the first input and output terminal may be dedicated to receiving the indication signal MODE. In this way, accurate reception of the indication signal may be facilitated.

In some alternative embodiments, the first input and output terminal may be a terminal multiplexed with other signals. For example, the indication signal MODE can share one terminal with the reset signal RESET. As another example, the indication signal MODE may share a terminal with the rate selection signal (not shown in the figure). It should be understood that the embodiments of the present disclosure are not limited thereto, but the indication signal MODE may be multiplexed with any other one or more suitable signals on one terminal. Through the multiplexing of terminals, changes to the hardware structure of the optical transceiver can be reduced, reducing costs.

In block 403, based on the indication signal MODE, the optical transceiver 310 adjusts the optical processing parameters of the receiver 311 in the optical transceiver 310 for the optical signal. According to some embodiments of the present disclosure, based on the indication signal MODE, the optical transceiver 310 can determine the working mode of the controller 320 . Based on the determined mode of operation, optical transceiver 310 may adjust optical processing parameters. In this way, the optical transceiver 310 can know the working mode of the controller 320 , so that it can timely adjust the optical processing parameters to process the optical signal received from the ONU 110 . This will be described in more detail below in conjunction with FIG. 5 .

FIG. 5 shows a flowchart of a method 500 for adjusting light processing parameters according to an embodiment of the present disclosure. The method of FIG. 5 can be implemented at an optical transceiver (for example, the optical transceiver 121 of FIG. 1 or the optical transceiver 310 of FIG. 3 ) at the OLT side, for example, implemented at the receiver 142 of FIG. 1 or the receiver 311 of FIG. 3 . For convenience, FIG. 5 will be described below in conjunction with the example in FIG. 3 . It should be understood that the method in FIG. 5 may include other additional steps not shown, or some steps shown may be omitted. The scope of the present disclosure is not limited thereto.

As shown in FIG. 5 , in block 501 , the optical transceiver 121 may determine whether the working mode of the controller 320 is the window opening mode or the data transceiving mode based on the indication signal MODE. In some embodiments, the optical transceiver 310 can determine the working mode of the controller 320 based on the characteristic of the indication signal MODE. For example, the characteristics of the indication signal MODE may include amplitude, frequency, phase and so on. It should be understood that this is merely an example and other features are possible.

In some embodiments, when the indication signal MODE is at the first level, the optical transceiver 310 may determine that the working mode of the controller 320 is the windowing mode. When the indication signal MODE is at a second level different from the first level, the optical transceiver 310 may determine that the working mode of the controller 320 is the data transceiving mode. For example, the first level and the second level may differ in at least one of amplitude, frequency and phase.

Continuing with the previous example, the first level has a first amplitude value and a first duration, and the second level has a second amplitude value and a second duration. In some embodiments, the first magnitude value of the first level may be greater than the second magnitude value of the second level. Alternatively, the first magnitude value may be smaller than the second magnitude value. In some alternative or additional embodiments, the first duration of the first level may be greater than the second duration of the second level. Alternatively, the first duration may also be shorter than the second duration. It should be understood that the above-mentioned embodiments are only examples, and the embodiments of the present disclosure are not limited thereto, and any other suitable features or combinations of features are feasible.

If it is determined at block 501 that the operating mode is the windowing mode, then at block 502 the optical transceiver 310 may adjust light processing parameters of the receiver 311 . For example, light processing parameters may include gain parameters, bias voltage, coupling capacitor voltage, DC bias, and the like. In some embodiments, optical transceiver 310 may adjust gain parameters to adjust optical processing parameters. Alternatively or additionally, the optical transceiver 310 may also adjust the bias voltage. As another example, in some examples, the bias voltage of the coupling capacitor can be adjusted, the DC bias can be eliminated, and so on. Note that these adjustment means can be used alone or in any combination. Of course, this is only an example, and any other suitable operations are also feasible.

For example, in some embodiments, if the indication signal MODE indicates that the working mode of the controller 320 is the windowing mode, the optical transceiver 310 can adjust the preamplifier in the amplifier 332 according to the intensity of the current signal converted by the optical detector 331. The bias voltage and gain parameters of an amplifier such as a TIA. In this way, the DC decision voltage can be quickly adjusted and an appropriate gain can be selected to generate an amplified voltage signal. Alternatively or additionally, the optical transceiver 310 may adjust the coupling capacitor voltage of a post-amplifier (eg, LA) in the amplifier 332 and remove the DC bias. Thus, the amplified voltage signal can be converted into a standard digital level signal, and output as the received data of the optical transceiver 310 RX. The standard digital level signal can conform to various standard digital level formats such as CML, PECL, LVDS and the like. It should be understood that this is only an example rather than a limitation, and the standard digital level signal may conform to any other standard digital level format known in the art or determined in the future.

Through the above adjustment of the optical processing parameters based on the indication signal, correct processing of the ONU optical signal can be realized even in the windowing mode. Thereby, the occurrence of the above-mentioned infinite loop can be avoided, and the registration and online of the ONU can be ensured. In addition, since the optical transceiver can know the current working mode in time, the design complexity of the optical transceiver, especially the amplifier, can be reduced. Furthermore, the size of the optical transceiver can be reduced, which facilitates the high integration of the OLT.

In some alternative embodiments, if the indication signal MODE indicates that the working mode of the controller 320 is the windowing mode, the optical transceiver 310 can reset the receiver 311 . In this case, the receiver 311 can be reset to process the optical signal from the ONU 110 without receiving the reset signal RESET from the controller 320 . In some embodiments, the optical transceiver 310 can autonomously generate a reset signal to reset the receiver 311 . Of course, any other suitable way can also be used to reset the receiver 311 . As mentioned earlier, resetting the receiver 311 refers to adjusting the light processing parameters of the receiver 311 to a predetermined value. In some embodiments, the predetermined value may be predetermined. In some embodiments, the predetermined value may be determined dynamically according to needs. By directly resetting, the adjustment of light processing parameters can be realized more conveniently and quickly.

As a result of the adjustment of the above optical processing parameters, at block 503, the optical transceiver 310 may provide a detection signal SD to the controller 320, indicating that the optical transceiver 310 has received an optical signal. In some embodiments, the optical transceiver 310 can also provide a standard digital level signal as a received data output RX to the controller 320 for further processing.

At block 504 , the optical transceiver 310 may receive a reset signal RESET from the controller 320 . The reset signal RESET is generated based on the detection signal SD, and is used to instruct the receiver 311 to be reset. In this way, the stability of the optical signal processing of the OLT 300 in the windowing mode can be ensured, and the occurrence of an infinite loop can be avoided.

If it is determined at 501 that the working mode is the data transceiving mode, at block 505 , the optical transceiver 310 may reset the receiver 311 based on a reset signal RESET from the controller 320 . In this way, the receiver 311 can process the optical signal from the ONU 110 for data transmission.

The optical signal processing method implemented at the optical transceiver according to the embodiment of the present disclosure is described above with reference to FIG. 4 and FIG. 5 , and the optical signal processing method implemented at the controller according to the embodiment of the present disclosure is described below with reference to FIG. 6 . FIG. 6 shows a flowchart of an optical signal processing method 600 according to an embodiment of the present disclosure. The method may be implemented at a controller at the OLT side (such as the controller 122 in FIG. 1 or the controller 320 in FIG. 3 ). For convenience, FIG. 6 will be described below in conjunction with the example in FIG. 3 . It should be understood that the method in FIG. 6 may include other additional steps not shown, or some steps shown may be omitted, and the scope of the present disclosure is not limited thereto.

As shown in FIG. 6 , at block 601 , the controller 320 generates an indication signal MODE, which is used to indicate the working mode of the controller 320 . In some embodiments, the working mode of the controller 320 is a window opening mode or a data transceiving mode. In some embodiments, the controller 320 can determine whether the working mode is the window opening mode or the data transceiving mode, and generate an indication signal MODE to indicate the working mode. For example, in some embodiments, if the working mode is switched from the data transceiving mode to the windowing mode, the controller 320 may generate an indication signal MODE to indicate that the working mode is the windowing mode. If the working mode is switched from the window opening mode to the data transmitting and receiving mode, the controller 320 generates an indication signal MODE to indicate that the working mode is the data transmitting and receiving mode.

In some embodiments, the controller 320 can indicate its working mode by indicating the characteristics of the signal MODE. Characteristics of the indicator signal may include amplitude, frequency, phase, and the like. It should be understood that this is merely an example and other features are possible. In some embodiments, if it is determined that the working mode is the window opening mode, the controller 320 may generate an indication signal MODE having a first level to indicate the window opening mode. If it is determined that the working mode is the data transceiving mode, the controller 320 may generate an indication signal MODE having a second level different from the first level to indicate the data transceiving mode. For example, the first level and the second level may differ in at least one of amplitude, frequency and phase.

Following the previous example, the first level has a first amplitude value and a first duration, and the second level has a second amplitude value and a second duration. In some embodiments, the first amplitude value of the first level may be greater than the second amplitude value of the second level. Alternatively, the first amplitude value may be made smaller than the second amplitude value. In some alternative or additional embodiments, the first duration of the first level may be made longer than the second duration of the second level. Of course, it is also feasible that the first duration is shorter than the second duration. The above-mentioned embodiments are only examples, and the embodiments of the present disclosure are not limited thereto, and any other suitable features or combinations of features are feasible.

At block 602 , the controller 320 may provide the indication signal MODE to the optical transceiver 310 . Thus, the optical transceiver 310 is made to adjust the optical processing parameters of the receiver 311 of the optical transceiver 310 based on the indication signal MODE. In some embodiments, the controller 320 may provide the indication signal MODE to the optical transceiver 310 via the second input and output terminal. In some embodiments, the second input and output terminals may be one or more pins. Of course, other forms of the second input and output terminals are also feasible. In some embodiments, the second input and output terminal may be dedicated to providing the indication signal MODE, as shown in FIG. 3 . In this way, accurate provision of the indication signal MODE can be facilitated.

In some alternative embodiments, the second input-output terminal may be a terminal multiplexed with other signals. For example, the indication signal MODE can share one terminal with the reset signal RESET. As another example, the indication signal MODE may share a terminal with the rate selection signal (not shown in the figure). It should be understood that the embodiments of the present disclosure are not limited thereto, but the indication signal MODE may be multiplexed with any other one or more suitable signals on one terminal. Through the multiplexing of terminals, changes to the hardware structure of the controller can be reduced, reducing costs.

In some alternative or additional embodiments, the controller 320 may also receive a detection signal SD from the optical transceiver 310, and generate a reset signal RESET based on the detection signal SD. Then, the controller 320 can provide the reset signal RESET to the optical transceiver 320 for resetting the receiver 311 of the optical transceiver 310 .

According to the method of the embodiment of the present disclosure, by notifying the optical transceiver 310 of the working mode of the controller 320 , the controller 320 can obtain the ONU optical signal accurately processed by the optical transceiver 310 . In this way, the stability and accuracy of the OLT side light reception processing can be improved. In addition, the design complexity of the optical transceiver can be reduced, and the high integration of the OLT can be promoted.

So far, the optical signal processing method, the optical transceiver, the controller, and the OLT according to the embodiments of the present disclosure have been described with reference to examples. In the method according to the embodiment of the present disclosure, the controller generates an indication signal indicating its working mode, and provides the indication signal to the optical transceiver. The optical transceiver receives the indication signal, and when receiving the optical signal from the ONU, adjusts the optical processing parameter for the optical signal based on the indication signal. Accordingly, an OLT according to an embodiment of the present disclosure includes an optical transceiver and a controller. An optical transceiver includes a receiver, which may include a photodetector and an amplifier coupled to the photodetector. The optical detector is configured to receive an optical signal from the ONU, and the amplifier is configured to receive an indication signal from the controller indicating an operating mode of the controller and adjust an optical processing parameter of the receiver for the optical signal based on the indication signal . The controller includes a first signal generator configured to generate the indication signal and provide the indication signal to the optical transceiver. According to the above solutions of the embodiments of the present disclosure, the stability and accuracy of the light receiving process at the OLT side can be ensured. In addition, it can reduce the design complexity of the optical transceiver, especially the amplifier, and promote the high integration of the OLT.

In general, the various example embodiments of the present disclosure may be implemented in hardware or special purpose circuits, software, logic, or any combination thereof. Certain aspects may be implemented in hardware, while other aspects may be implemented in firmware or software, which may be executed by a controller, microprocessor or other computing device. When aspects of the embodiments of the present disclosure are illustrated or described as block diagrams, flowcharts, or using some other graphical representation, it is to be understood that the blocks, devices, systems, techniques, or methods described herein may serve as non-limiting Examples are implemented in hardware, software, firmware, special purpose circuits or logic, general purpose hardware or controllers or other computing devices, or some combination thereof. Examples of hardware devices that can be used to implement embodiments of the present disclosure include, but are not limited to: Field Programmable Gate Array (FPGA: Field Programmable Gate Array), Application-Specific Integrated Circuit (ASIC: Application-Specific Integrated Circuit), Application-Specific Standard Products (ASSP: Application-Specific Standard Product), System On a Chip (SOC: System On a Chip), Complex Programmable Logic Device (CPLD: Complex Programmable Logic Device), etc.

As an example, embodiments of the present disclosure may be described in the context of machine-executable instructions, such as program modules included in a device executed on a real or virtual processor of a target. Generally, program modules include routines, programs, libraries, objects, classes, components, data structures, etc. that perform particular tasks or implement particular abstract data structures. In various embodiments, the functionality of the program modules may be combined or divided between the described program modules. Machine-executable instructions for program modules may be executed locally or in distributed devices. In a distributed device, program modules may be located in both local and remote storage media.

Computer program codes for implementing the methods of the present disclosure may be written in one or more programming languages. These computer program codes can be provided to processors of general-purpose computers, special-purpose computers, or other programmable data processing devices, so that when the program codes are executed by the computer or other programmable data processing devices, The functions/operations specified in are implemented. The program code may execute entirely on the computer, partly on the computer, as a stand-alone software package, partly on the computer and partly on a remote computer or entirely on the remote computer or server.

In the context of the present disclosure, computer program code or related data may be carried by any suitable carrier to enable a device, apparatus or processor to perform the various processes and operations described above. Examples of carriers include signals, computer readable media, and the like.

Examples of signals may include electrical, optical, radio, sound, or other forms of propagated signals, such as carrier waves, infrared signals, and the like.

A machine-readable medium may be any tangible medium that contains or stores a program for or related to an instruction execution system, apparatus, or device. A machine-readable medium can be a machine-readable signal medium or a machine-readable storage medium. A machine-readable medium may include, but is not limited to, an electronic, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or any suitable combination thereof. More detailed examples of machine-readable storage media include electrical connections with one or more wires, portable computer disks, hard disks, Random Access Memory (RAM: Random Access Memory), Read Only Memory (ROM: Read Only Memory), Erasable Programmable Read Only Memory (EPROM: Erasable Programmable Read Only Memory or flash memory), optical storage device, magnetic storage device, or any suitable combination thereof.

In addition, while operations are depicted in a particular order, this should not be understood as requiring that such operations be performed in the particular order shown, or in sequential order, or that all illustrated operations be performed, to achieve desirable results. In some cases, multitasking or parallel processing can be beneficial. Likewise, while the above discussion contains certain specific implementation details, these should not be construed as limitations on the scope of any invention or claims, but rather as a description of particular embodiments that may be directed to particular inventions. Certain features that are described in this specification in the context of separate embodiments can also be implemented integrally in a single embodiment. Conversely, various features that are described in the context of a single embodiment can also be implemented in multiple embodiments separately or in any suitable subcombination.

Although the subject matter has been described in language specific to structural features and/or methodological acts, it is to be understood that the subject matter defined in the appended claims is not limited to the specific features or acts described above. Rather, the specific features and acts described above are disclosed as example forms of implementing the claims.

Claims (36)

1. An optical signal processing method, comprising:

the optical transceiver receives an optical signal from the optical network unit;

the optical transceiver receives an indication signal from a controller, wherein the indication signal is used for indicating the working mode of the controller; and

if the indication signal indicates that the working mode of the controller is a windowing mode, the optical transceiver adjusts optical processing parameters of a receiver of the optical transceiver aiming at the optical signal so as to process the optical signal;

the windowing mode is that the controller allocates a specific time slot for the optical network unit to be on-line, so that the optical transceiver receives an optical signal from the optical network unit to be on-line and performs ranging processing to complete registration on-line of the optical network unit to be on-line.

2. The method of claim 1, wherein the optical transceiver adjusting the optical processing parameters comprises:

based on the indication signal, the optical transceiver determining an operating mode of the controller; and

based on the operating mode, the optical transceiver adjusts the optical processing parameters.

3. The method of claim 1, wherein a characteristic of the indicator signal is used to indicate an operating mode of the controller, the characteristic comprising at least one of amplitude, frequency, and phase.

4. The method of claim 1, wherein an operating mode of the controller is the windowing mode or a data transceiving mode.

5. The method of any of claims 1-4, wherein the optical transceiver adjusting the optical processing parameters comprises:

if the indication signal indicates that the working mode of the controller is the windowing mode, performing at least one of the following:

adjusting a gain parameter of the receiver;

adjusting a bias voltage of the receiver;

adjusting a coupling capacitance bias voltage of the receiver; and

and eliminating the direct current bias of the receiver.

6. The method of any of claims 1-4, the optical transceiver to adjust the optical processing parameters comprising:

resetting the receiver.

7. The method of any of claims 1-4, further comprising:

and if the indication signal indicates that the working mode of the controller is a data transceiving mode, resetting the receiver based on a reset signal from the controller.

8. The method of any of claims 1-4, wherein the optical transceiver receiving the indication signal comprises:

the optical transceiver receives the indication signal from the controller via a first input-output terminal of the optical transceiver.

9. The method of claim 8, wherein the first input-output terminal is dedicated to reception of the indication signal.

10. The method of any of claims 1-4, further comprising:

the optical transceiver providing a detection signal to the controller, the detection signal indicating that the optical transceiver has received the optical signal; and

the optical transceiver receives a reset signal from the controller, the reset signal being generated by the controller based on the detection signal, the reset signal being used to reset the receiver.

11. An optical signal processing method, comprising:

the method comprises the steps that a controller generates an indication signal, and the indication signal is used for indicating the working mode of the controller; and

the controller provides the indication signal to an optical transceiver so that the optical transceiver adjusts optical processing parameters of a receiver of the optical transceiver when the indication signal indicates that the working mode of the controller is a windowing mode to process an optical signal;

the windowing mode is that the controller allocates a specific time slot for the optical network unit to be on-line, so that the optical transceiver receives an optical signal from the optical network unit to be on-line and performs ranging processing to complete registration on-line of the optical network unit to be on-line.

12. The method of claim 11, wherein the controller generating the indication signal comprises:

determining whether the operating mode of the controller is the windowing mode or the data transceiving mode; and

generating the indication signal to indicate an operating mode of the controller.

13. The method of claim 11, wherein a characteristic of the indicator signal is used to indicate an operating mode of the controller, the characteristic including at least one of amplitude, frequency, and phase.

14. The method of any of claims 11-13, wherein the controller generating the indication signal comprises:

if the working mode of the controller is switched to the windowing mode from the data receiving and transmitting mode, generating the indicating signal to indicate that the working mode is the windowing mode; and

and if the working mode of the controller is switched to the data transceiving mode from the windowing mode, generating the indication signal to indicate that the working mode is the data transceiving mode.

15. The method of any of claims 11-13, wherein the controller providing the indication signal comprises:

providing the indication signal to the optical transceiver via a second input-output terminal of the controller.

16. The method of claim 15, wherein the second input-output terminal is dedicated to the provision of the indication signal.

17. The method according to any one of claims 11-13, further comprising:

the controller receives a detection signal from the optical transceiver indicating that the optical transceiver has received the optical signal; and

the controller provides a reset signal to the optical transceiver, the reset signal being generated by the controller based on the detection signal, the reset signal being used to reset the receiver.

18. An optical transceiver, comprising:

a receiver, the receiver comprising:

a light detector configured to receive an optical signal from an optical network unit;

an amplifier coupled with the light detector and configured to:

receiving an indication signal from a controller, wherein the indication signal is used for indicating the working mode of the controller; and

if the indication signal indicates that the working mode of the controller is a windowing mode, adjusting the optical processing parameters of the receiver aiming at the optical signal so as to process the optical signal;

the windowing mode is that the controller allocates a specific time slot for the optical network unit to be on-line, so that the optical transceiver receives an optical signal from the optical network unit to be on-line and performs ranging processing to complete registration on-line of the optical network unit to be on-line.

19. The optical transceiver of claim 18, wherein the amplifier is further configured to:

determining an operating mode of the controller based on the indication signal; and

adjusting an optical processing parameter of the receiver based on the operating mode.

20. The optical transceiver of claim 18, wherein a characteristic of the indication signal is used to indicate an operating mode of the controller, the characteristic comprising at least one of amplitude, frequency, and phase.

21. The optical transceiver of claim 18, wherein the controller operates in the windowing mode or a data transceiving mode.

22. The optical transceiver of any of claims 18-21, wherein the amplifier is further configured to:

if the indication signal indicates that the working mode of the controller is the windowing mode, performing at least one of the following:

adjusting a gain parameter of the receiver;

adjusting a bias voltage of the receiver;

adjusting a coupling capacitance bias voltage of the receiver; and

and eliminating the DC offset of the receiver.

23. The optical transceiver of any of claims 18-21, wherein the amplifier is further configured to:

resetting the receiver.

24. The optical transceiver of any of claims 18-21, wherein the amplifier is further configured to:

resetting the receiver based on a reset signal from the controller if the indication signal indicates that the operating mode of the controller is a data transceiving mode.

25. The optical transceiver of any of claims 18-21, wherein the amplifier is further configured to:

receiving the indication signal from the controller via a first input-output terminal of the optical transceiver.

26. The optical transceiver of claim 25, wherein the first input-output terminal is dedicated to reception of the indication signal.

27. The optical transceiver of any of claims 18-21, wherein the amplifier is further configured to:

providing a detection signal to the controller, the detection signal indicating that the optical transceiver has received the optical signal, an

Receiving a reset signal from the controller, the reset signal generated by the controller in response to the detection signal, the reset signal to reset the receiver.

28. The optical transceiver of any of claims 18-21, wherein the amplifier comprises a pre-amplifier and a post-amplifier.

29. A controller, comprising:

a first signal generator configured to:

generating an indication signal for indicating an operating mode of the controller; and

providing the indication signal to an optical transceiver to cause the optical transceiver to adjust an optical processing parameter of a receiver in the optical transceiver to process an optical signal when the indication signal indicates that the operating mode of the controller is the windowed mode;

the windowing mode is that the controller allocates a specific time slot for the optical network unit to be on-line, so that the optical transceiver receives an optical signal from the optical network unit to be on-line and performs ranging processing to complete registration on-line of the optical network unit to be on-line.

30. The controller of claim 29, wherein the first signal generator is further configured to:

determining whether the operating mode of the controller is the windowing mode or the data transceiving mode; and

generating the indication signal to indicate an operating mode of the controller.

31. The controller of claim 29, wherein a characteristic of the indicator signal is used to indicate an operating mode of the controller, the characteristic including at least one of amplitude, frequency, and phase.

32. The controller of any one of claims 29-31, wherein the first signal generator is further configured to:

if the working mode of the controller is switched to the windowing mode from the data receiving and transmitting mode, generating the indicating signal to indicate that the working mode is the windowing mode; and

and if the working mode of the controller is switched to a data transceiving mode from the windowing mode, generating the indication signal to indicate that the working mode is the data transceiving mode.

33. The controller of any one of claims 29-31, wherein the first signal generator is further configured to:

providing the indication signal to the optical transceiver via a second input-output terminal of the controller.

34. The controller of claim 33, wherein the second input-output terminal is dedicated to the provision of the indication signal.

35. The controller of any of claims 29-31, further comprising:

a second signal generator configured to:

receiving a detection signal from the optical transceiver, the detection signal indicating that the optical transceiver has received an optical signal; and

providing a reset signal to the optical transceiver, the reset signal generated based on the detection signal, the reset signal to reset the receiver.

36. An optical line terminal comprising:

the optical transceiver of any of claims 18-28; and

a controller according to any of claims 29-35.

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