CN111970049B - Optical power detection method and device - Google Patents

Abstract

The application discloses a method and a device for detecting optical power, which are used for solving the problem of low accuracy rate of judging whether the optical power of a standby port meets the requirement of optical power budget by judging whether an SD signal exists or not. By determining the maximum received optical power and the minimum received optical power at the active port, and when the standby port and the link normally transmit optical signals, and the maximum received optical power and the minimum received optical power on the standby port do not meet the preconfigured conditions, the standby port does not meet the requirements of the optical power budget.

Description

Method and device for detecting optical power

technical field

The present application relates to the technical field of optical communication, and in particular, to a method and device for detecting optical power.

Background technique

In the typical networking of passive optical network (PON) Type B protection, two PON ports in an optical line termination (OLT) are added to a protection group, so as to protect the optical line termination. (optical line termination, OLT) PON port and trunk fiber are protected. When a certain OLTPON port or trunk fiber fails, it can automatically switch to another OLT PON port or trunk fiber. One of the two PON ports in the protection group is a working port and the other is a protection port. In the normal working state, the working port carries services. When the link where the working port is located fails, the system automatically switches the services of the working port to the protection port to ensure the normal transmission of services. There are two states of protection group members: active and standby. Ports in the active state forward data, and ports in the standby state do not forward data.

In order to perform normal service switching on two ports, it is necessary to ensure that the optical power budget of the active port and standby port of the TypeB protection group meets the requirements of the GPON optical power budget.

Since the optical network unit (ONU) only goes online on the active port, the standby port only receives the upstream optical signal and does not send the downstream optical signal. The optical power of the standby port cannot be accurately measured when the standby port does not emit any signal.

In the prior art, whether the standby port has an optical signal is determined by regularly checking whether the standby port has SD (signal detect), so as to determine whether the optical power of the standby port meets the requirements of the GPON optical power budget. The SD signal can only judge that the optical path has light when the optical intensity is above -35dbm, and the GPON optical budget usually requires the optical intensity received by the OLT to be between -28dbm and -8dbm. Therefore, whether there is an SD signal can determine whether the optical path optical power of the standby port is The accuracy rate of meeting the GPON optical budget requirements is low, and some ONUs cannot meet the optical power budget requirements after switching services, resulting in switching failures and service interruptions.

SUMMARY OF THE INVENTION

Embodiments of the present application provide an optical power detection method and device, which are used to solve the existing problem of low accuracy in judging whether the optical path optical power of the standby port meets the GPON optical budget requirement by whether there is an SD signal.

An embodiment of the present application provides a method for detecting optical power, including: an OLT detecting a first maximum received optical power among received optical powers of optical signals received by a first optical module installed on a first port within a first preset time period at least one of the power and the first minimum received optical power, the first port is in a non-working state; the OLT determines that at least one of the first condition, the second condition or the third condition is satisfied, and outputs alarm information, and the alarm information is used to indicate that the optical power of the first port does not meet the requirements of the optical power budget; wherein, the first condition is that the first maximum received optical power is less than a first threshold, and the second condition is that the first maximum received optical power The power is greater than a second threshold, and the third condition is that the first minimum received optical power is less than a third threshold, and the second threshold is greater than the first threshold.

Wherein, when the first port is in a non-working state, the first port can receive the optical signal but not transmit the optical signal. The non-working state can also be called the standby state, or the standby state. The first port may also be referred to as a standby port.

Exemplarily, the first threshold, the second threshold and the third threshold are all related to the optical power budget. Since the standby port can receive optical signals, this embodiment of the present application determines whether the optical power of the standby port meets the requirements of the optical power budget by detecting at least one of the maximum received optical power and the minimum received optical power of the standby port. Thus, the accuracy of judgment is improved, and to a certain extent, it is avoided that some ONUs cannot meet the optical power budget requirements after switching services, resulting in switching failure and service interruption.

In a possible design, the method may further include: detecting, by the OLT, a second maximum received optical power of the optical signals received by the second optical module installed on the second port within a second preset time period The received optical power and the second minimum received optical power, the second port is in a working state, and the received optical signals come from a plurality of optical network units ONU; wherein, the first threshold is related to the first difference, and all The first difference is equal to the difference between the second maximum received optical power and the second minimum received optical power.

Wherein, when the second port is in a working state, the second port can receive an optical signal or transmit an optical signal. The working state can also be called the active state or the active state. The second port may also be referred to as an active port.

In this design, by determining the maximum received optical power and the minimum received optical power on the active port, it can be inferred that when the standby port and the link corresponding to the standby port transmit optical signals normally, the maximum received optical power on the standby port can be inferred. and the minimum received optical power should be smaller than the maximum and minimum received optical power of the active port. Therefore, the first threshold is determined by the difference between the maximum received optical power and the minimum received optical power of the active port, and then according to the relationship between the maximum received optical power of the standby port and the first threshold, it is determined whether there is an individual optical signal on the standby port that is too low or not. Meeting the requirements of the optical power budget can improve the accuracy of the determination.

Exemplarily, the second threshold is less than or equal to the maximum receiving sensitivity of the optical power of the first optical module. Exemplarily, the third threshold is greater than or equal to a minimum receiving sensitivity value of the optical power of the first optical module.

In a possible design, the first maximum received optical power is the maximum received optical power of the optical signal at N×M time points detected in the N detection cycles; wherein the duration of the N detection cycles is less than or equal to the first preset duration, the optical signals at M time point positions are collected in each detection period, the time point positions of the collected optical signals in any two adjacent detection periods are different, and N is an integer greater than 1 , M is an integer greater than 1.

In the above design, the time points and positions of the collected optical signals in any two adjacent detection periods are not the same, that is to say, in each detection period, a fixed time point position will not be used to collect the optical signals to obtain the reception of the collected optical signals. Optical power.

In one possible design, the M is related to the minimum sampling interval supported by the OLT.

In a possible design, the OLT detects a first maximum received optical power and a first minimum received optical power among the received optical powers of the optical signals received by the first optical module installed on the first port within a first preset time period Before receiving at least one of the optical powers, it also includes:

The OLT allocates to the first ONU a second light-emitting time slot that is not occupied by the plurality of ONUs on the second port except the first light-emitting time slot currently occupied by the first ONU, so that the The first ONU sends an optical signal to the OLT in the first light-emitting time slot and the second light-emitting time slot, and the first ONU is the ONU corresponding to the second maximum received optical power among the plurality of ONUs.

In general, the upstream traffic of the PON port is much smaller than the theoretical bandwidth of the PON port. In the above design, the remaining bandwidth of the active port is allocated as much as possible to the ONU corresponding to the maximum received optical power of the online active port, and the optical signal with the maximum received optical power is increased. The proportion of the allocated bandwidth of the ONU is increased, thereby increasing the probability that the sampling point hits the maximum received optical power.

Based on the same inventive concept as the first aspect, in the second aspect, an embodiment of the present application provides an optical power detection device, and the device is applied to an optical line terminal OLT, including:

The first detection module is used to detect the first maximum received optical power and the first minimum received optical power among the received optical powers of the optical signals received by the first optical module installed on the first port within the first preset time period At least one of the first ports is in a non-working state;

a processing module, configured to determine that at least one of condition 1, condition 2 or condition 3 is satisfied, and output alarm information, where the alarm information is used to indicate that the optical power of the first port does not meet the requirements of the optical power budget;

The first condition is that the first maximum received optical power is less than a first threshold, the second condition is that the first maximum received optical power is greater than a second threshold, and the third condition is that the first minimum received optical power is The power is less than a third threshold, and the second threshold is greater than the first threshold.

In a possible design, the device further includes:

a second detection module, configured to detect the second maximum received optical power and the second minimum received optical power among the received optical powers of the optical signals received by the second optical module installed on the second port within the second preset time period, The second port is in a working state, and the received optical signals come from a plurality of ONUs;

The first threshold value is related to a first difference value, and the first difference value is equal to the difference between the second maximum received optical power and the second minimum received optical power.

In a possible design, the second threshold is less than or equal to the maximum receiving sensitivity of the optical power of the first optical module.

In a possible design, the third threshold is greater than or equal to a minimum receiving sensitivity value of the optical power of the first optical module.

In a possible design, the first maximum received optical power is the maximum received optical power of the optical signal at N×M time points detected in N detection cycles;

The duration of the N detection cycles is less than or equal to the first preset duration, the optical signals at M time points are collected in each detection cycle, and the time points at which the optical signals are collected in any two adjacent detection cycles are Not the same, N is an integer greater than 1, and M is an integer greater than 1.

In one possible design, the M is related to the minimum sampling interval supported by the OLT.

In one possible design, also include:

a distribution module, configured to detect, at the first detection module, the first maximum received optical power and the first received optical power of the optical signals received by the first optical module installed on the first port within the first preset time period Before at least one of the minimum received optical powers, in addition to the first light-emitting time slot currently occupied by the first ONU, the second light-emitting time slot that is not occupied by the plurality of ONUs on the second port is allocated to the first ONU. An ONU, so that the first ONU can send optical signals to the OLT in the first light-emitting time slot and the second light-emitting time slot, and the first ONU is the first ONU corresponding to the first maximum received optical power among the plurality of ONUs ONU.

In a third aspect, an embodiment of the present application further provides a device, which may be an OLT, for implementing the method described in the first aspect; the device may also be another device capable of supporting the OLT to implement the method described in the first aspect, For example, a device that can be provided in an OLT. Wherein, it may be a chip system, a module or a circuit etc. provided in the OLT, which is not specifically limited in this application. The apparatus includes a processor for implementing the function of the OLT in the method described in the first aspect above. The apparatus may also include a memory for storing program instructions and data. The memory is coupled to the processor, and the processor invokes and executes program instructions stored in the memory, so as to implement the function of the OLT in the method described in the first aspect above. The apparatus may also include a communication interface for the apparatus to communicate with other devices. Exemplarily, the other device is an ONU. In this embodiment of the present application, the communication interface may include a circuit, a bus, an interface, a communication interface, or any other device capable of implementing a communication function.

In a fourth aspect, the embodiments of the present application further provide a computer storage medium, where a software program is stored in the storage medium, and the software program can implement the first aspect or the first aspect when read and executed by one or more processors The method of any design of the aspect.

In a fifth aspect, embodiments of the present application provide a computer program product containing instructions, which, when run on a computer, cause the computer to execute the method described in the first aspect or any design of the first aspect.

In a sixth aspect, an embodiment of the present application provides a chip system, where the chip system includes a processor, and may also include a memory, for implementing the function of the OLT in the above method. The chip system can be composed of chips, and can also include chips and other discrete devices.

In a seventh aspect, an embodiment of the present application provides a system, where the system includes an OLT and a plurality of ONUs. The ONU is configured to send an optical signal to the OLT, and the OLT is configured to receive the optical signal, and perform the method described in the first aspect or any design of the first aspect based on the optical signal.

Description of drawings

FIG. 1 is a schematic diagram of an optical communication system architecture provided by an embodiment of the present application;

FIG. 2 is a schematic structural diagram of a type B protection single-homed networking according to an embodiment of the present application;

3 is a flowchart of a method for detecting optical power provided by an embodiment of the present application;

4 is a schematic diagram of different ONU receiving optical powers in a DBA cycle provided by an embodiment of the present application;

FIG. 5 is a schematic diagram of translation of detection points in different detection periods provided by an embodiment of the present application;

FIG. 6 is a schematic diagram of bandwidth allocation according to an embodiment of the present application;

FIG. 7 is a flowchart of another method for detecting optical power provided by an embodiment of the present application;

FIG. 8 is another schematic diagram of bandwidth allocation provided by an embodiment of the present application;

FIG. 9 is a schematic structural diagram of an apparatus 900 provided by an embodiment of the present application;

FIG. 10 is a schematic structural diagram of an OLT1000 according to an embodiment of the present application.

Detailed ways

It should be understood that references throughout the specification to "one embodiment," "one implementation," "one implementation," or "an example" mean that a particular feature, structure, or characteristic associated with the embodiment is included within the scope of this application. in at least one embodiment. Thus, appearances of "in one embodiment," "one implementation," "one implementation," or "in an example" in various places throughout this specification are not necessarily necessarily referring to the same embodiment. Furthermore, the particular features, structures or characteristics may be combined in any suitable manner in one or more embodiments. It should be understood that, in various embodiments of the present application, the size of the sequence numbers of the above-mentioned processes does not mean the sequence of execution, and the execution sequence of each process should be determined by its functions and internal logic, and should not be dealt with in the embodiments of the present application. implementation constitutes any limitation.

Additionally, the terms "system" and "network" are often used interchangeably herein. The term "and/or" in this article is only an association relationship to describe the associated objects, indicating that there can be three kinds of relationships, for example, A and/or B, it can mean that A exists alone, A and B exist at the same time, and A and B exist independently B these three cases. In addition, the character "/" in this document generally indicates that the related objects are an "or" relationship. It should be understood that, in this embodiment of the present application, "B corresponding to A" means that B is associated with A, and B can be determined according to A. However, it should also be understood that determining B according to A does not mean that B is only determined according to A, and B may also be determined according to A and/or other information. And, unless stated to the contrary, the ordinal numbers such as “first” and “second” mentioned in the embodiments of the present application are used to distinguish multiple objects, and are not used to limit the order, sequence, priority or priority of multiple objects. Importance. In addition, the terms "comprising" and "having" in the embodiments and claims of the present application and the drawings are not exclusive. For example, a process, method, system, product or device that includes a series of steps or modules is not limited to the listed steps or modules, and may also include unlisted steps or modules.

The embodiments of the present application may be applied to an optical communication system, and the optical communication system may be a PON system. The PON system can be a gigabit-capable PON (GPON) system, an Ethernet passive optical network (ethernetPON, EPON) system, a 10Gb/s ethernet passive optical network (10G) -EPON) system, time and wavelength division multiplexing passive optical network (TWDM-PON), ten gigabit passive optical network (10 gigabit-capable passive optical network, XG-PON) system or ten Gigabit symmetric passive optical network (10-gigabit-capable symmetric passive optical network, XGS-PON) system, etc. New technologies evolving in the future will increase the PON rate to 25 Gbps, 50 Gbps or even 100 Gbps, so this application can also apply a PON system with a higher transmission rate.

The optical communication system includes at least an OLT and a plurality of ONUs, and the OLT communicates with the plurality of ONUs respectively. The optical communication system may further include an optical distribution network (Optical Distribute Network, ODN), and multiple ONUs may be connected to the PON port of the same OLT through the ODN.

Exemplarily, the optical communication system may also include other network devices, such as user terminals, servers, mobile base stations, and the like. As shown in FIG. 1 , an optical communication system topology is exemplarily described. In the topology shown in FIG. 1 , the communication devices can be divided into "user side" and "network side" according to the connection relationship of the communication devices. For a user terminal that terminates services, such as a personal computer (PC), in the network topology shown in FIG. 1, there is only the network side; while for a communication device that terminates some services, such as a dynamic host setup protocol (dynamic host configurationprotocol, DHCP) dial-up server, possibly only the user side. The OLT connects the equipment on the user side with the router equipment on the network side, and plays the role of aggregation and access. The OLT can access a variety of network equipment, such as PCs, mobile base stations, and ONUs.

The following describes the technical terms involved in the embodiments of the present application.

1. xPON Type B protection

The xPON Type B protection refers to the dual redundant protection of the OLT's PON port and the backbone fiber in the xPON network. xPON Type B protection can improve the reliability of the ODN network and ensure uninterrupted services.

Referring to Fig. 2, an example is a networking structure of xPON Type B protection single-homing. Type B protection single-homing mainly protects the OLT PON port and the trunk fiber. When the OLT PON port or the trunk fiber fails, it can automatically switch to another OLT PON port or the trunk fiber.

2. Protection group

In the xPON Type B protection single-homing scenario, add two PON access ports on an OLT to a protection group. Two PON access ports on one OLT can be on the same PON board or on two PON boards. When two PON access ports on a PON board are used to form a protection group, hardware resources can be saved, but when the PON board fails, services of the entire board will be interrupted. When two PON access ports on two PON boards are used to form a protection group, although the hardware cost is increased compared with one PON board, when one of the PON boards (can be called the main PON board) fails, the service can Switching to a PON port on another PON board for service access will not cause service interruption.

1) There are two roles for members of the protection group: work and protect.

A protection group includes a working port (ie, a work port) and a protection port (ie, a protection port). The working port and the protection port are respectively two access PON ports. The working port can also be called the active port, and the protected port can also be called the standby port.

In the normal working state, the working port carries services. When the link where the working port is located fails, the system automatically switches the services of the working port to the protection port to ensure the normal transmission of services.

2), the protection group member status.

There are two states of protection group members: working state and non-working state. The working state may also be referred to as an active (active) state, and the non-working state may also be referred to as a standby (standby) state. Ports in the active state forward data, and ports in the standby state do not forward data.

It should be understood that, in a normal working state, the working port is in an active state, and the protection port is in a standby state. When the link where the working port is located fails, the working port changes from the active state to the standby state, and the protection port changes from the standby state to the active state.

3), switching type.

There are two types of protection group switching: automatic switching triggered by faults and protection switching performed manually. Human operations that cause protection switching include manual switching, forced switching, and locking. Automatic switching means that the OLT and ONU automatically perform optical link switching without human intervention when the switching conditions are met. Manual switching is a way to manually control the switching of protection groups, for example, by running the manual-switch command on the OLT. Forced switching is considered to be enforced. For example, by running the force-switch command on the OLT, the optical link switching occurs regardless of whether the specified target member is normal or not.

After the switchover occurs, when the active state of the working port changes to the standby state, if the OLT runs the lockout command to lock the member ports of the protection group, the work port and the protection port can be locked in the Type B single-homing scenario, and protection switching will occur. The status of the work port changes from standby to active.

4) The condition for switching occurs: the optical power of the active port and the standby port of the Type B protection group meets the requirements of the PON optical power budget.

Type B protection group is a typical cold backup protection mechanism. The ONU only goes online on the active port, so the standby port only receives upstream optical signals and does not send downstream optical signals. When the standby port does not emit light, it is impossible to accurately measure the emission of the standby port. Optical power. At present, it is judged whether the standby port has an optical signal by regularly checking whether the standby port has SD (signal detect), so as to determine whether the optical power of the standby port meets the requirements of the GPON optical power budget. The SD signal can only judge that the optical path has light when the optical intensity is above -35dbm, and the GPON optical budget usually requires the optical intensity received by the OLT to be between -28dbm and -8dbm, so the optical power of the standby port cannot be judged by whether there is an SD signal. Whether it meets the GPON optical budget requirements. Some ONUs cannot meet the optical power budget requirements after switching services, and the switching fails and services are interrupted.

Based on this, embodiments of the present application provide an optical power detection method and device, which are used to improve the accuracy of optical power detection. Among them, the method and the device are based on the same inventive concept. Since the principles of the method and the device for solving the problem are similar, the implementation of the device and the method can be referred to each other, and the repetition will not be repeated.

In the embodiment of the present application, the protection group includes one working port and one protection port as an example for description. It should be understood that the number of working ports and protection ports included in the protection group is not limited during system configuration. The main purpose of this application is to detect whether the optical power of the protection port meets the optical power budget requirement.

In this embodiment of the present application, it can be determined whether the optical power of the protection port meets the optical power budget requirement according to the maximum value and/or the minimum value of the received optical power of the detected protection port. Exemplarily, the OLT determines that at least one of condition 1, condition 2 or condition 3 is satisfied according to the maximum value and/or the minimum value of the received optical power of the protection port, and determines that the optical power of the protection port does not meet the optical power budget requirements.

Condition 1: the first maximum received optical power is less than a first threshold;

Condition 2: the first maximum received optical power is greater than the second threshold;

Condition 3: The first minimum received optical power is less than the third threshold.

Wherein, the second threshold is greater than the first threshold, and the third threshold is less than the first threshold.

The solutions provided by the embodiments of the present application are exemplarily described in detail as follows from the perspective of configuration condition 1 and from the perspectives of configuration condition 2 and condition 3. For other combinations, see configuration condition 1, condition 2, and condition 3. No longer.

The following first describes in detail the above implementation solution by determining whether the first maximum received optical power is less than the first threshold.

Referring to FIG. 3 , it is a schematic flowchart of a method for detecting optical power in an embodiment of the present application.

S301 , the OLT detects a first maximum received optical power among received optical powers of optical signals received by a first optical module installed on a first port within a first preset time period, and the first port is in a non-working state.

Wherein, when the first port is in a non-working state, the first port can receive the optical signal but not transmit the optical signal. The non-working state can also be called the standby state, or the standby state. The first port may also be referred to as a standby port. In the subsequent description, the first port in the non-working state is referred to as a standby port as an example for description.

S302: When the OLT determines that the first maximum received optical power is less than a first threshold (ie, condition 1), output alarm information, where the alarm information is used to indicate that the optical power of the first port does not meet the requirements of the optical power budget.

Exemplarily, the alarm information may include at least one of the following:

Identifier of the OLT (for example, chassis number), slot number (each board is plugged into one slot, and an OLT has multiple slots), and port number. Ports that do not meet the optical power budget requirements are indicated by including the above information in the alarm information.

The first threshold can be determined in various ways, and two ways of determining the first threshold are exemplarily described as follows:

In the first example, the first threshold may be related to the difference between the maximum received optical power and the minimum received optical power of the second port in the working state.

Based on this, the method may also include:

S303, the OLT detects the second maximum received optical power and the second minimum received optical power among the received optical powers of the optical signals received by the second optical module installed on the second port within the second preset time period; wherein, The first threshold value is related to a first difference value, and the first difference value is equal to the difference between the second maximum received optical power and the second minimum received optical power. The second port is in a working state, and the received optical signals come from a plurality of ONUs.

Exemplarily, when the second port is in a working state, the second port can receive an optical signal and can also transmit an optical signal. The working state can also be called the active state or the active state. The second port may also be referred to as an active port.

Exemplarily, the first threshold may be equal to the sum of the first difference and the preconfigured threshold. The preconfigured threshold may be less than or equal to the minimum receiving sensitivity of the optical power of the first optical module, for example, the preconfigured threshold may be equal to the minimum receiving sensitivity of the optical power of the first optical module.

In the second example, the first threshold may be an empirical value. For example, it can be an empirical value obtained through multiple experiments.

In one example, in a dynamically bandwidth assignment (DBA) cycle, different ONUs transmit optical signals in different time slots. For the convenience of description, the second port in the working state is called the active port. When detecting the second maximum received optical power and the second minimum received optical power, the OLT may measure the received signal strength indication (RSSI) on all online ONUs under the active port in turn, and record the received signal strength indication (RSSI) of the active port. Optical power value of an ONU. The maximum value in the record is taken as the second maximum received optical power of the active port; the minimum value in the record is taken as the second minimum received optical power of the active port. For example, as shown in FIG. 4 , the optical communication system includes an OLT and 4 ONUs, and the OLT communicates with the 4 ONUs respectively. The four ONUs are ONU1, ONU2, ONU3 and ONU4 respectively. The bandwidth occupied by the four ONUs may not occupy the entire bandwidth. The OLT detects the maximum and minimum received optical powers of the optical signals of ONU1-OTN4 on the active port, where the maximum value is the second maximum received optical power, and the minimum value is the second minimum received optical power. In Figure 4, the height of the rectangular frame indicates the corresponding received optical power of each ONU. Therefore, for Figure 4, the second maximum received optical power is the received optical power of ONU2, and the second minimum received optical power is the received optical power of ONU3. Optical power.

As an example, the second preset duration may be configured as one or more DBA cycles, for example, the second preset duration is equal to one DBA cycle. The duration of the second preset duration configuration may be configured as required, which is not specifically limited in this application.

It should be understood that the first preset duration and the second preset duration may or may not be equal.

Exemplarily, since the OLT generally does not perform any processing on the optical signal transmitted by the standby port, in this embodiment of the present application, the OLT is configured to receive the optical signal transmitted by the standby port, and can sample the optical signal transmitted by the standby port to detect the optical signal. received optical power.

It should be noted that the active port and the standby port in the OLT can be configured on the same board or on different boards. When it is necessary to determine whether the standby port meets the requirements of the optical power budget, the OLT is configured on the standby port. The maximum received optical power detection can be started.

In the embodiment of the present application, by determining the maximum received optical power and the minimum received optical power on the active port, it can be inferred that when the standby port and the link corresponding to the standby port normally transmit optical signals, the maximum received optical power on the standby port can be inferred. The power and minimum received optical power should be smaller than the maximum and minimum received optical power of the active port. In actual measurement, the accuracy of measuring the minimum received optical power of the standby port is relatively low. Therefore, in this embodiment of the present application, the first threshold determined based on optical power prediction is used as the possible minimum received optical power of the standby port. If the difference between the maximum received optical power (the second maximum received optical power) and the first threshold is smaller than the difference between the maximum received optical power and the minimum received optical power of the active port, it is determined that individual optical signals on the standby port are too low and do not meet the optical power budget. requirements.

Exemplarily, when the conditions shown in the following formula (1) are satisfied, the standby port does not meet the requirement of the optical power budget:

ROPmaxS<thres+(ROPmaxA-ROPminA); formula (1)

Wherein, ROPmaxS represents the maximum received optical power of the standby port, and the first threshold=thres+(ROPmaxA-ROPminA). ROPmaxA represents the maximum received optical power of the active port, ROPminA represents the minimum received optical power of the active port, and thres represents the preconfigured threshold.

When the conditions shown in the following formula (2) are satisfied, the standby port meets the requirements of the optical power budget.

ROPmaxS≥thres+(ROPmaxA-ROPminA); formula (2).

In a possible example, when detecting the maximum received optical power of the first optical module on the first port, N detection periods may be configured, and M time point positions may be set for each detection period. The duration of the N detection cycles is equal to or less than the first preset duration. It should be understood that the N detection periods may be exactly equal to the first preset duration, and of course, the N detection periods may be less than the first preset duration. Measurement is performed within the detection period, and the remaining half period is not measured. Of course, the remaining half period may also be measured, which is not specifically limited in this application. N is an integer greater than 1, and M is an integer greater than 1. In this example, the maximum received optical power of the standby port (the first maximum received optical power) is the maximum received optical power of optical signals in N×M time points detected in N detection cycles; The optical signals at M time-point positions are collected in a cycle, and the time-point positions of the collected optical signals in any two adjacent detection cycles are different. In any two adjacent detection periods, the time points and positions of the collected optical signals are different, that is, in each detection period, a fixed time point position is not used to collect the optical signals to obtain the received optical power of the collected optical signals.

Exemplarily, one detection period may be equal to one DBA period, or equal to multiple DBA periods.

As an example, the "detection point shift" method can be used to measure the maximum received optical power of the standby port. When configuring the acquisition time point, the start position of the acquisition time point of the next detection cycle is a quantitative translation of the start position of the acquisition time point of the previous detection cycle. In a detection cycle, the interval between any two time points is the same. For example, referring to FIG. 5 , two detection periods are taken as an example. The time points at which the optical signals are collected in the first detection cycle are A1-A7. The time points at which the optical signals are collected in the second detection period are B1-B7, and the translation amount is X. By using different detection periods and different detection points, the probability that the standby collects the maximum received optical power can be improved.

It should be understood that, in the manner in which the first threshold is determined in the first example, the detection point shift method may also be used to measure the maximum received optical power and the minimum received optical power of the active port.

As another example, the detection method may be randomly determined, for example, the detection point is randomly determined in each detection period. Therefore, by using different detection periods and different detection points, the probability that the standby collects the maximum received optical power can be improved.

In another possible example, a "dense triggering" approach may be used, that is, there are as many detection points as possible in each detection cycle. For example, the number of detection points in each detection period can be determined according to the minimum sampling interval supported by the OLT. For example, the number of detection points in each detection period is equal to the number determined according to the minimum sampling interval supported by the OLT and the duration of the detection period. For another example, the number of detection points in each detection cycle is equal to 3/4 of the number determined according to the minimum sampling interval supported by the OLT and the duration of the detection cycle. For another example, the number of detection points in each detection cycle is equal to 1/2 of the number determined according to the minimum sampling interval supported by the OLT and the duration of the detection cycle. Exemplarily, the sampling interval may range from 125us to 500us. The minimum sampling interval supported by the OLT is related to the RSSI sampling capability and CPU processing capability of the OLT.

Exemplarily, the number of sampling points in different detection periods may also be different, which is not specifically limited in this application.

It should be understood that, in the manner in which the above-mentioned first threshold is determined in the first example, a manner of dense triggering of detection point translation can also be used to measure the maximum received optical power and the minimum received optical power of the active port.

In another possible example, the upstream traffic of the PON port is usually much smaller than the theoretical bandwidth of the PON port, and the optical power detection directly on the standby port has a high probability of missing the real maximum value. In order to reduce the possibility of missing the maximum value , to improve the probability of hitting the maximum received optical power, the remaining bandwidth of the active port can be allocated as much as possible to the ONU corresponding to the maximum received optical power of the online active port, and the proportion of the allocated bandwidth of the ONU that sends out the optical signal with the maximum received optical power can be increased. . For example, the first ONU is the ONU corresponding to the second maximum received optical power among the plurality of ONUs. Exemplarily, before the OLT performs detection of the first maximum received optical power of the optical signals received by the first optical module installed on the first port within the first preset time period, the OLT may remove the first ONU In addition to the currently occupied first light-emitting time slot, the second light-emitting time slot on the active port that is not occupied by the plurality of ONUs is allocated to the first ONU, so that the first ONU can use the first light-emitting time slot in the first light-emitting time slot. and the second light-emitting time slot sends an optical signal to the OLT. Since the proportion of the allocated bandwidth of the ONU that transmits the optical signal with the maximum received optical power increases in the detection period, the probability that the standby port detects the maximum received optical power is increased. For example, as shown in FIG. 6 , other bandwidths on the active port that are not occupied by the ONUs are allocated to ONU2. Before the allocation, the sampling points may not hit the maximum received optical power, and other bandwidths smaller than the maximum received optical power may not be reached. The value of the received optical power is taken as the maximum received optical power. After the allocation, the sampling points D2 and D3 both hit the maximum received optical power, so by assigning other bandwidths to the ONU with the maximum received optical power of the active port, the probability that the sampling point hits the maximum received optical power can be improved.

It should be noted that, the second light-emitting time slot may be the entire bandwidth on the active port that is not occupied by the multiple ONUs. Or part of the bandwidth on the active port that is not occupied by the multiple ONUs, which is not specifically limited in this embodiment of the present application.

In a possible example, generally, when the optical signal sent by the ONU with the maximum received optical power corresponding to the active port is transmitted through the standby port, the received optical power is very likely to be the maximum received optical power. Based on this, when the OLT detects the first maximum received optical power among the received optical powers of the optical signals received on the standby port within the first preset time period, it may be implemented in the following manner:

The OLT detects the received optical power of the optical signal from the first ONU of the first optical module on the first port within the first preset time period as the first maximum received optical power. The first ONU is an ONU corresponding to the second maximum received optical power among the plurality of ONUs.

Specifically, the OLT detects the received optical power of the optical signal from the first ONU on the standby port within the first preset time period, and can detect the received optical power of the optical signal on the corresponding light-emitting time slot of the first ONU. For example, if the first ONU sends an optical signal on the first light-emitting time slot, the OLT detects the received optical power of the optical signal received from the standby port on the first light-emitting time slot.

Exemplarily, after the ONU with the maximum received optical power corresponding to the active port can be determined, the remaining bandwidth of the active port can be allocated as much as possible to the ONU corresponding to the maximum received optical power of the online active port, and the optical output with the maximum received optical power can be increased. The proportion of the allocated bandwidth of the ONU of the signal. For example, when the OLT detects the received optical power of the optical signal from the first ONU on the standby port within the first preset time period, it can detect the received optical power on the active port except the first light-emitting time slot currently occupied by the first ONU. The second light-emitting time slot occupied by the plurality of ONUs is allocated to the first ONU, so that the first ONU sends an optical signal to the OLT in the first light-emitting time slot and the second light-emitting time slot. Therefore, the OLT can detect the received optical power of the optical signal on the corresponding first light-emitting time slot and the second light-emitting time slot of the first ONU. Exemplarily, in this example, the second preset duration may only be equal to one detection period. Of course, in order to improve the detection accuracy, the received optical power of the optical signal may be detected on the corresponding first light-emitting time slot and the second light-emitting time slot of the first ONU multiple times in multiple detection periods. The maximum value detected in multiple detections is taken as the maximum received optical power of the standby port, that is, the first maximum received optical power.

As an example, when the OLT detects the received optical power of the optical signal on the corresponding first light-emitting time slot and the second light-emitting time slot of the first ONU, it can detect multiple light-emitting powers on the first light-emitting time slot and the second light-emitting time slot. The received optical power of the detected optical signal at the detection time point.

The solution implemented by determining whether the second condition and/or the third condition is satisfied in the embodiments of the present application will be described in detail below.

Referring to FIG. 7 , it is a schematic flowchart of another optical power detection method provided in an embodiment of the present application.

S701, the OLT detects a first maximum received optical power and a first minimum received optical power among received optical powers of optical signals received by a first optical module installed on a first port within a first preset time period.

S702, the OLT determines that the first minimum received optical power of the standby port is less than a third threshold and/or the first maximum received optical power of the standby port is greater than a second threshold, and outputs alarm information.

Exemplarily, the second threshold is less than or equal to the maximum receiving sensitivity of the optical power of the first optical module. The third threshold value is greater than or equal to the minimum receiving sensitivity value of the optical power of the first optical module. For example, the optical power budget of the optical module ranges from -28dB to -8dB, the maximum receiving sensitivity of the optical power of the first optical module can be equal to -8dB or slightly less than -8dB, and the minimum receiving sensitivity value of the optical power of the first optical module can be equal to -28dB or slightly more than -28dB.

In a possible design, after it is determined that the first minimum received optical power of the standby port is greater than or equal to the third threshold, and the first maximum received optical power of the standby port is less than or equal to the second threshold, alarm recovery information is output, and the alarm is recovered. The information is used to indicate that the optical power of the standby port meets the requirements of the optical power budget.

Wherein, when the first minimum received optical power of the standby port is less than the third threshold, the received optical power of the individual optical signals existing on the standby port is too low, and when the maximum received optical power of the standby port is greater than the second threshold, the individual optical signals of the standby port exist. The received optical power of the signal is too high. When the received optical power of individual optical signals on the standby port is too high and/or too low, the output alarm information can be sent to the network manager, so that the network manager can adjust the links or ports that do not meet the requirements in time.

In a possible example, when S701 is executed, a method of "detection point translation" may be adopted. For details, please refer to the relevant description in the embodiment shown in FIG. 3 , which will not be repeated here.

In another possible example, in the execution of S701, a "intensive triggering" manner may be adopted. For details, please refer to the relevant description in the embodiment shown in FIG. 3, which will not be repeated here.

In another possible example, before the OLT performs S701, the OLT detects the second maximum received optical power among the received optical powers of the optical signals from the multiple ONUs on the second optical module of the active port within the second preset time period optical power and the second minimum received optical power. In general, the upstream traffic of the PON port is much smaller than the theoretical bandwidth of the PON port, and the optical power detection directly on the standby port has a high probability of missing the real maximum value. In order to reduce the possibility of missing the maximum value, the maximum and minimum received optical power are improved The probability that the remaining bandwidth of the active port can be allocated as much as possible to the ONU corresponding to the maximum received optical power and the minimum received optical power of the online active port, and the proportion of the allocated bandwidth of the ONU that sends out the optical signal with the maximum and minimum received optical power is increased. .

For example, taking FIG. 4 as an example, ONU2 is the ONU corresponding to the second maximum received optical power among the four ONUs, and OTN3 is the ONU corresponding to the second minimum received optical power among the four ONUs.

Exemplarily, before the OLT executes S701, except for the light-emitting time slot 1 currently occupied by ONU2 and the light-emitting time slot 2 currently occupied by ONU2, other light-emitting time slots on the active port that are not occupied by the four ONUs Slots are allocated to the ONU2 and ONU3. Since the proportion of the allocated bandwidth of the ONU that transmits the optical signal with the maximum and minimum received optical power increases in the detection period, the probability of the standby port detecting the maximum and minimum received optical power is increased. For example, as shown in FIG. 8 , other bandwidths on the active port that are not occupied by the four ONUs are allocated to ONU2 and OTN3.

Based on the same inventive concept as the above-mentioned embodiment, the embodiment of the present application further provides an apparatus. The device is applied to OLT. Specifically, the apparatus may be a processor, a chip, a chip system, or a functional module for sending, or the like. As shown in FIG. 9 , the device includes a first detection module 901, a second detection module 902 and a processing module 903; wherein the first detection module 901 is used to execute S301 or S701, the second detection module 902 is used to execute S303, The processing module 903 is used for executing S302 or for executing S702.

Optionally, the above three modules may also perform other relevant optional steps performed by the OLT mentioned in any of the foregoing embodiments, which will not be repeated here.

The division of modules in the embodiments of the present application is schematic, and is only a logical function division, and there may be other division manners in actual implementation. In addition, each functional module in each embodiment of the present application may be integrated into one processor, or may exist physically alone, or two or more modules may be integrated into one module. The above-mentioned integrated modules can be implemented in the form of hardware, and can also be implemented in the form of software function modules.

The embodiment of the present application further provides an OLT structure. As shown in FIG. 10 , the OLT 1000 includes a communication interface 1010A and a communication interface 1001B, a processor 1020 and a memory 1030 . Exemplarily, the communication interface 1010A is an active port, and the communication interface 1010B is a standby port.

The first detection module 901 , the second detection module 902 and the processing module 903 shown in FIG. 9 above can all be implemented by the processor 1020 . The processor 1020 receives the optical signal through the communication interface 1010A, and when the optical power budget detection of the standby port is activated, receives the optical signal through the communication interface 1010B, and is used to implement the method performed by the OLT in FIG. 3 and FIG. 7 . In the implementation process, the steps of the processing flow may be implemented by the hardware integrated logic circuit in the processor 1020 or the instructions in the form of software to complete the method executed by the OLT in any of the foregoing embodiments.

In this embodiment of the present application, the communication interface 1010A and the communication interface 1010B may be a circuit, a bus, a transceiver, or any other device that can be used for information interaction. Wherein, for example, the other device may be a device connected to the device 1000, for example, the other device may be an ONU.

In this embodiment of the present application, the processor 1020 may be a general-purpose processor, a digital signal processor, an application-specific integrated circuit, a field programmable gate array or other programmable logic device, a discrete gate or transistor logic device, or a discrete hardware component, which may be implemented or executed The methods, steps, and logical block diagrams disclosed in the embodiments of the present application. A general purpose processor may be a microprocessor or any conventional processor or the like. The steps of the method disclosed in conjunction with the embodiments of the present application may be directly embodied as executed by a hardware processor, or executed by a combination of hardware and software units in the processor. The program codes executed by the processor 1020 for implementing the above method may be stored in the memory 1030 . Memory 1030 is coupled to processor 1020 . The coupling in the embodiments of the present application is an indirect coupling or communication connection between devices, units or modules, which may be in electrical, mechanical or other forms, and is used for information exchange between devices, units or modules. The processor 1020 may cooperate with the memory 1030 . The memory 1030 may be a non-volatile memory, such as a hard disk drive (HDD) or a solid-state drive (SSD), etc., and may also be a volatile memory (volatile memory), such as random access memory (random access memory). -access memory, RAM). Memory 1030 is any other medium that can be used to carry or store desired program code in the form of instructions or data structures and that can be accessed by a computer, but is not limited thereto.

The specific connection medium between the communication interface 1010 , the processor 1020 , and the memory 1030 is not limited in this embodiment of the present application. In the embodiment of the present application, the memory 1030, the processor 1020, and the communication interface 1010 are connected through a bus in FIG. 10. The bus is represented by a thick line in FIG. 10. The connection mode between other components is only for schematic illustration. It is not limited. The bus can be divided into an address bus, a data bus, a control bus, and the like. For ease of presentation, only one thick line is used in FIG. 10, but it does not mean that there is only one bus or one type of bus.

Based on the above embodiments, the embodiments of the present application may further provide a system including an OLT and a plurality of ONUs. The OLT is used to send optical signals to the ONU or receive optical signals sent by the ONU.

Based on the above embodiments, the embodiments of the present application further provide a computer storage medium, where a software program is stored in the storage medium, and when the software program is read and executed by one or more processors, it can implement any one or more of the above Methods provided by the examples. The computer storage medium may include: U disk, removable hard disk, read-only memory, random access memory and other media that can store program codes.

Based on the above embodiments, an embodiment of the present application further provides a chip, where the chip includes a processor for implementing the functions involved in any one or more of the above embodiments, such as acquiring or processing the data frames involved in the above method . Optionally, the chip further includes a memory, and the memory is used for necessary program instructions and data to be executed by the processor. The chip may consist of chips, or may include chips and other discrete devices.

As will be appreciated by those skilled in the art, the embodiments of the present application may be provided as a method, a system, or a computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, etc.) having computer-usable program code embodied therein.

The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the present application. It will be understood that each flow and/or block in the flowchart illustrations and/or block diagrams, and combinations of flows and/or blocks in the flowchart illustrations and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to the processor of a general purpose computer, special purpose computer, embedded processor or other programmable data processing device to produce a machine such that the instructions executed by the processor of the computer or other programmable data processing device produce Means for implementing the functions specified in a flow or flow of a flowchart and/or a block or blocks of a block diagram.

These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory result in an article of manufacture comprising instruction means, the instructions The apparatus implements the functions specified in the flow or flow of the flowcharts and/or the block or blocks of the block diagrams.

These computer program instructions can also be loaded on a computer or other programmable data processing device to cause a series of operational steps to be performed on the computer or other programmable device to produce a computer-implemented process such that The instructions provide steps for implementing the functions specified in the flow or blocks of the flowcharts and/or the block or blocks of the block diagrams.

Obviously, those skilled in the art can make various changes and modifications to the embodiments of the present application without departing from the scope of the embodiments of the present application. Thus, if these modifications and variations of the embodiments of the present application fall within the scope of the claims of the present application and their equivalents, the present application is also intended to include these modifications and variations.

Claims (13)

1. A method for detecting optical power, comprising:

the method comprises the steps that an Optical Line Terminal (OLT) detects at least one of a first maximum receiving optical power and a first minimum receiving optical power in receiving optical power of an optical signal received by a first optical module installed on a first port within a first preset time, wherein the first port is in a non-working state;

the OLT determines that at least one of a first condition, a second condition or a third condition is met, and outputs alarm information, wherein the alarm information is used for indicating that the optical power of the first port does not meet the requirement of an optical power budget;

wherein the first condition is that the first maximum received optical power is less than a first threshold, the second condition is that the first maximum received optical power is greater than a second threshold, the third condition is that the first minimum received optical power is less than a third threshold, and the second threshold is greater than the first threshold;

the method further comprises the following steps:

the OLT detects a second maximum receiving optical power and a second minimum receiving optical power in receiving optical power of optical signals received by a second optical module installed on a second port within a second preset time, the second port is in a working state, and the received optical signals are from a plurality of Optical Network Units (ONU); wherein the first threshold is associated with a first difference value and the first difference value is equal to a difference between the second maximum received optical power and the second minimum received optical power;

before the OLT detects at least one of a first maximum received optical power and a first minimum received optical power in received optical power of an optical signal received by a first optical module installed on a first port within a first preset time, the OLT further includes:

the OLT allocates, to the first ONU, a second light-emitting time slot that is not occupied by the ONUs on the second port, except for a first light-emitting time slot currently occupied by the first ONU, so that the first ONU transmits an optical signal to the OLT in the first light-emitting time slot and the second light-emitting time slot, where the first ONU is an ONU corresponding to a second maximum received optical power among the ONUs.

2. The method of claim 1, wherein the second threshold is less than or equal to a receive sensitivity maximum for the first optical module optical power.

3. The method of claim 1, wherein the third threshold is greater than or equal to a receive sensitivity minimum for the first optical module optical power.

4. The method according to any one of claims 1 to 3, wherein the first maximum received optical power is a maximum received optical power of the optical signal at N × M time points detected in N detection periods;

the time length of N detection periods is less than or equal to the first preset time length, optical signals of M time point positions are collected in each detection period, the time point positions of the collected optical signals in any two adjacent detection periods are different, N is an integer larger than 1, and M is an integer larger than 1.

5. The method of claim 4, wherein the M is related to a minimum sampling interval supported by the OLT.

6. An optical power detection device, which is applied to an Optical Line Terminal (OLT), comprises:

the first detection module is used for detecting at least one of a first maximum received optical power and a first minimum received optical power in the received optical power of an optical signal received by a first optical module installed on a first port within a first preset time period, and the first port is in a non-working state;

the processing module is used for determining that at least one of a first condition, a second condition or a third condition is met, and outputting alarm information, wherein the alarm information is used for indicating that the optical power of the first port does not meet the requirement of an optical power budget;

wherein the first condition is that the first maximum received optical power is less than a first threshold, the second condition is that the first maximum received optical power is greater than a second threshold, the third condition is that the first minimum received optical power is less than a third threshold, and the second threshold is greater than the first threshold;

the second detection module is configured to detect a second maximum received optical power and a second minimum received optical power in received optical powers of optical signals received by a second optical module installed on a second port within a second preset time period, where the second port is in a working state, and the received optical signals are from a plurality of optical network units ONU; wherein the first threshold is associated with a first difference value and the first difference value is equal to a difference between the second maximum received optical power and the second minimum received optical power;

the first ONU is configured to send the optical signal to the OLT in the first light-emitting timeslot and the second light-emitting timeslot, where the first ONU is not occupied by the ONUs, and the first ONU is an ONU corresponding to the first maximum received optical power among the ONUs.

7. The apparatus of claim 6, wherein the second threshold is less than or equal to a receive sensitivity maximum of the first light module optical power.

8. The apparatus of claim 6, wherein the third threshold is greater than or equal to a receive sensitivity minimum for the first light module optical power.

9. The apparatus according to any one of claims 6-8, wherein the first maximum received optical power is a maximum received optical power of the optical signal at N × M time points detected in N detection periods;

the time length of N detection periods is less than or equal to the first preset time length, optical signals of M time point positions are collected in each detection period, the time point positions of the collected optical signals in any two adjacent detection periods are different, N is an integer larger than 1, and M is an integer larger than 1.

10. The apparatus of claim 9, wherein the M is related to a minimum sampling interval supported by the OLT.

11. An optical line terminal comprising a processor and a memory, wherein:

the memory is used for storing program codes;

the processor is used for reading and executing the program codes stored in the memory so as to realize the method of any one of claims 1 to 5.

12. A passive optical network, PON, system comprising the OLT of claim 11 and a plurality of ONUs in communication with the OLT.

13. A computer-readable storage medium storing computer instructions which, when executed by a computer, cause the computer to perform the method of any one of claims 1 to 5.

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