CN108989913A - Transmit the method and passive light network transmission system of optical signal - Google Patents
Transmit the method and passive light network transmission system of optical signal Download PDFInfo
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- H—ELECTRICITY
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- H—ELECTRICITY
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Abstract
The invention discloses a kind of methods and passive light network transmission system for transmitting optical signal, this method comprises: the first optical signal received is converted to the second optical signal；The second optical signal is routed into corresponding passive optical network equipment according to default routing rule.The present invention is after receiving the first optical signal, it is converted into the second optical signal that passive optical network equipment can identify, the second optical signal is routed into corresponding passive optical network equipment passive optical network equipment according still further to default routing rule, whole process is routed according to default routing rule, second optical signal is not limited when being routed by set one-to-one passive optical network equipment, networking flexibility is high, system performance is preferable, solve the problems, such as the as follows of the prior art: the ODN being connected with RE equipment can only connect to corresponding OLT, it is unfavorable for flexible networking, system performance is poor.
Description
Technical Field
The present invention relates to the field of communications, and in particular, to a method for transmitting an optical signal and a passive optical network transmission system.
Background
A Passive Optical Network (PON) provides a connection between an Optical Line Terminal (OLT) and a plurality of Optical Network Units (ONUs), and shares an Optical fiber medium between the OLT and a Remote Node (RN), which has advantages of low cost, convenience in maintenance, transparency to various services, and the like, so that the PON technology has become a mainstream technology of broadband access during a full service operation period.
With the advancement of FTTX (new generation optical fiber user access network) network construction, operators hopefully reduce the network construction cost and operation and maintenance cost, and the future access network development direction is wide coverage, large capacity and few offices. In contrast, in the conventional PON system, since the transmission distance is limited, the number of OLTs needs to be increased to increase the coverage. Therefore, long-distance PON systems with large coverage and large splitting ratio features are receiving more and more attention from operators.
As shown in fig. 1, in a long-distance PON system, an OLT is generally connected to an Optical Distribution Network (ODN) through a distance Extender (RE). And the RE adopts optical-electrical-optical relay equipment or optical amplification equipment to improve the optical power budget between the OLT and the ONU and expand the OLT coverage range.
In view of the fact that the RE device is generally an active device, in a long-distance PON system, a plurality of ODNs and a plurality of OLTs can share one RE to reduce the advantages of active device nodes, and meanwhile, the utilization rate of trunk optical fibers can be improved, but in general, the ODNs connected with the RE device can only be connected to the corresponding OLT, which is not beneficial to flexible networking; meanwhile, if the OLT corresponding to the ODN fails, if the OLT cannot be immediately switched to the normal working OLT, service interruption of all ONU devices connected to the ODN may be caused. Therefore, there is a need to solve the above problems.
Disclosure of Invention
The invention provides a method for transmitting optical signals and a passive optical network transmission system, which are used for solving the following problems in the prior art: the ODN connected to the RE device can only be connected to the corresponding OLT, which is not conducive to flexible networking and has poor system performance.
To solve the above technical problem, in one aspect, a method for transmitting an optical signal is provided, including: converting the received first optical signal into a second optical signal; and routing the second optical signal to the corresponding passive optical network equipment according to a preset routing rule.
Optionally, the passive optical network device includes: an optical line termination OLT or an optical distribution network ODN.
Optionally, converting the received first optical signal into a second optical signal, including: and when the first optical signal and the second optical signal are standard PON wavelength signals at the same time, performing optical power conversion on the first optical signal to convert the first optical signal into the second optical signal.
Optionally, converting the received first optical signal into a second optical signal, including: carrying out optical power and wavelength conversion on a plurality of downlink wavelength division multiplexing WDM optical signals input by a plurality of OLTs so as to convert the optical signals into standard PON wavelength downlink optical signals; or, a plurality of standard PON wavelength uplink optical signals input by a plurality of ODNs are subjected to optical power and wavelength conversion to be converted into an uplink WDM optical signal.
Optionally, routing the second optical signal to a corresponding passive optical network device according to a preset routing rule includes: detecting whether a signal fault exists in an optical signal corresponding to the passive optical network equipment to be routed; under the condition that a signal fault exists, switching or combining the second optical signal to preset passive optical network equipment according to the preset routing rule;
wherein, the preset passive optical network device comprises: spare idle passive optical network equipment or normally working passive optical network equipment.
In another aspect, a passive optical network transmission system is provided, including a passive optical network device and an RE, where the RE includes: and the wavelength conversion routing unit is used for converting the received first optical signal into a second optical signal and routing the second optical signal to the corresponding passive optical network equipment according to a preset routing rule.
Optionally, the passive optical network device includes: OLT or ODN.
Optionally, the wavelength conversion routing unit includes: the N-by-N optical switch array or the N-by-N electric switch array is used for signal routing; and a conversion device, the conversion device comprising: an optical-to-electrical signal converter for converting the optical power or wavelength of the first optical signal to the second optical signal; or, the optical amplifier is used for converting the optical power of the first optical signal to convert the first optical signal into the second optical signal.
Optionally, the wavelength conversion routing unit includes: a wavelength-variable optical-to-electrical signal converter.
Optionally, the wavelength conversion routing unit further includes: the optical link monitor is used for detecting whether a signal fault exists in an optical signal to be routed; and the N-by-N optical switch array or the N-by-N electric switch array switches the second optical signal to the spare idle passive optical network equipment according to the preset routing rule under the condition that a signal fault exists.
Optionally, the wavelength conversion routing unit further includes: and the electrical signal combiner is used for combining the second optical signal to the normally working passive optical network equipment connected with the electrical signal combiner according to the preset routing rule under the condition that a signal fault exists.
Optionally, the RE further includes: and the optical interface unit is used for receiving the first optical signal and the second optical signal and decomposing or combining the first optical signal and the second optical signal.
Optionally, the optical interface unit includes: wavelength division multiplexer and the ascending-descending of ascending-descending single fiber two-way up-descending multiplexer wave-divider, wherein, wavelength division multiplexer includes: a downstream wavelength division multiplexer and an upstream wavelength division multiplexer.
Optionally, the wavelength division multiplexer includes a wavelength selective switch WSS.
After receiving the first optical signal, the invention converts the first optical signal into a second optical signal which can be identified by the passive optical network equipment, and then routes the second optical signal to the corresponding passive optical network equipment according to the preset routing rule, the whole process is routed according to the preset routing rule, the second optical signal is not limited by the established passive optical network equipment which corresponds to one by one when being routed, the networking flexibility is high, the system performance is better, and the following problems in the prior art are solved: the ODN connected to the RE device can only be connected to the corresponding OLT, which is not conducive to flexible networking and has poor system performance.
Drawings
Fig. 1 is a schematic diagram of the connection of components in a long-reach PON system in the prior art;
FIG. 2 is a method of transmitting an optical signal in a first embodiment of the present invention;
fig. 3 is a schematic structural diagram of an RE device of a long-distance PON in a fourth embodiment of the present invention;
fig. 4 is a block diagram of a long-haul PON transmission RE apparatus according to a first embodiment of the present invention;
FIG. 5 is a block diagram of an optical interface module according to a first embodiment of the present invention;
fig. 6 is a block diagram of a wavelength conversion routing module according to a first embodiment of the present invention;
fig. 7 is a schematic diagram of an optical signal monitoring scheme of an optical interface module according to a second embodiment of the present invention;
FIG. 8 is a block diagram of an RE device in example three in the fourth embodiment of the present invention;
FIG. 9 is a schematic diagram of an electrical signal routing unit of example four in a fourth embodiment of the present invention;
fig. 10 is a block diagram of an RE device according to example five in the fourth embodiment of the present invention.
Detailed Description
In order to solve the following problems in the prior art: the ODN connected with the RE equipment can only be connected to the corresponding OLT, which is not beneficial to flexible networking and has poor system performance; the present invention provides a method for transmitting an optical signal, a storage medium, and a PON transmission device, and the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and do not limit the invention.
The first embodiment of the present invention provides a method for transmitting an optical signal, the flow of the method is shown in fig. 2, and the method includes steps S202 to S204:
s202, converting the received first optical signal into a second optical signal.
In the downstream direction, the first optical signal may be transmitted by the OLT through the trunk fiber, and in the upstream direction, the first optical signal may be transmitted by the ODN side.
In the process of converting the optical signal, the optical power and the wavelength may be converted or only the optical power may be converted according to the optical signal.
And S204, routing the second optical signal to the corresponding passive optical network device according to a preset routing rule. In the process, the passive optical network device includes an OLT or an ODN, a second optical signal is routed to the ODN in a downlink direction, and the second optical signal is routed to the OLT through a trunk optical fiber OTL in an uplink direction.
After receiving the first optical signal, the embodiment of the present invention converts the first optical signal into a second optical signal that can be identified by the passive optical network device, and then routes the second optical signal to the corresponding passive optical network device according to the preset routing rule, in the whole process, the routing is performed according to the preset routing rule, the second optical signal is not limited by the passive optical network devices corresponding to one by one when being routed, the networking flexibility is high, the system performance is better, and the following problems in the prior art are solved: the ODN connected to the RE device can only be connected to the corresponding OLT, which is not conducive to flexible networking and has poor system performance.
In the process of converting the first optical signal into the second optical signal, if the first optical signal and the second optical signal are both standard PON wavelength signals, only the first optical signal is subjected to optical power conversion and not wavelength conversion so as to be converted into the second optical signal.
When the first optical signal and the second optical signal are different optical signals, for different optical signal transmission directions of the downlink and the uplink, the process of converting the first optical signal into the second optical signal by the passive optical network device is as follows:
in a downlink direction, a plurality of downlink WDM (Wavelength division multiplexing) optical signals input by a plurality of OLTs are converted into standard PON Wavelength downlink optical signals; and in the uplink direction, a plurality of standard PON wavelength uplink optical signals input by a plurality of ODNs are converted into uplink WDM optical signals.
When the second optical signal is routed to the corresponding passive optical network device according to the preset routing rule, whether a signal fault exists in the optical signal corresponding to the passive optical network device to be routed or not can be detected; and if the signal fault exists, switching or merging the second optical signal to a preset passive optical network device according to a preset routing rule, and if the signal fault does not exist, routing the second optical signal to a corresponding passive optical network device according to the preset routing rule, namely, the spare idle passive optical network device which needs to be switched or merged to when the fault exists, or the passive optical network device which normally works. When an optical signal has a fault, the prior art does not have any way to switch, but the mode of the embodiment can be adopted to easily switch or combine.
No matter whether signal faults exist in the process, switching, merging or direct routing can be carried out according to preset routing rules, and system performance is greatly improved.
Through the above description of the embodiments, those skilled in the art can clearly understand that the method according to the above embodiments can be implemented by software plus a necessary general hardware platform, and certainly can also be implemented by hardware, but the former is a better implementation mode in many cases. Based on such understanding, the technical solutions of the present invention may be embodied in the form of a software product, which is stored in a storage medium (e.g., ROM/RAM, magnetic disk, optical disk) and includes instructions for causing a terminal device to execute the method of the embodiments of the present invention.
The second embodiment of the invention also provides a storage medium. Alternatively, in the present embodiment, the storage medium may be configured to store program codes for performing the following steps:
s11, converting the received first optical signal into a second optical signal.
In implementation, the first optical signal may be transmitted by the trunk fiber, or may be transmitted by the ODN side.
And S12, routing the second optical signal to the corresponding passive optical network device according to the preset routing rule. In this process, since the first optical signal transmitting ends may be different, there are two cases for the passive optical network device, that is, the passive optical network device may be an OLT or an ODN.
When being executed by a processor, the storage medium in this embodiment converts a first optical signal into a second optical signal that can be identified by a passive optical network device after receiving the first optical signal, and then routes the second optical signal to a corresponding passive optical network device according to a preset routing rule, where the whole process is routed according to the preset routing rule, the second optical signal is not limited by the passive optical network device corresponding to a predetermined one-to-one when being routed, the networking flexibility is high, the system performance is better, and the following problems in the prior art are solved: the ODN connected to the RE device can only be connected to the corresponding OLT, which is not conducive to flexible networking and has poor system performance.
When the processor executes routing of the second optical signal to the corresponding passive optical network device according to the preset routing rule, whether a signal fault exists in the optical signal corresponding to the passive optical network device to be routed or not can be detected; and if the signal fault exists, switching the second optical signal to the standby passive optical network equipment corresponding to the preset passive optical network equipment according to a preset routing rule, and if the signal fault does not exist, routing the second optical signal to the corresponding passive optical network equipment according to the preset routing rule. No matter whether signal faults exist in the process, switching or direct routing can be carried out according to a preset routing rule, and the system performance is greatly improved.
The process of converting the first optical signal into the second optical signal is different for different passive optical network devices.
For different optical signal transmission directions of downlink and uplink, the processes of converting the first optical signal into the second optical signal by the passive optical network device are respectively as follows: in a downlink direction, converting a plurality of downlink WDM optical signals input by a plurality of OLTs into downlink optical signals with a standard PON wavelength; and in the uplink direction, a plurality of standard PON wavelength uplink optical signals input by a plurality of ODNs are converted into uplink WDM optical signals.
A third embodiment of the present invention provides a PON transmission system, including an OLT, an RE, an ODN, and an ONU, which are connected in sequence, where the RE includes: a wavelength conversion routing unit, configured to convert the received first optical signal into a second optical signal, and route the second optical signal to a corresponding passive optical network device according to a preset routing rule, where the passive optical network device includes: OLT or ODN.
In a specific implementation, the wavelength conversion routing unit includes: an N by N optical switch array or an N by N electrical switch array for signal routing. When the wavelength routing conversion unit is composed of a switch array, the wavelength routing conversion unit needs to further include a conversion device coupled to the switch array, for example, an optical-to-electrical signal converter or an optical amplifier. The photoelectric signal converter is used for converting the optical power or wavelength of the first optical signal to convert the first optical signal into a second optical signal; or, the optical amplifier is used for converting the optical power of the first optical signal to convert the first optical signal into the second optical signal.
Therefore, when the first optical signal and the second optical signal are both standard PON wavelength signals, an optical amplifier or an optical-to-electrical signal converter may be provided to convert the low optical power into the high optical power; when the first optical signal and the second optical signal are different optical signals, an optical-to-electrical signal converter may be provided.
In the implementation process, a wavelength-variable photoelectric signal converter can be used to replace the combination of the switch array and the conversion device, which can achieve the same effect.
The RE may also include an optical link monitor coupled to the switch array for detecting whether there is a signal failure in the optical signal to be routed. In the process of the RE operation, in the case of a signal failure, if there is an empty PON interface, an N-by-N optical switch array, or an N-by-N electrical switch array, the second optical signal is switched to a spare idle passive optical network device according to a preset routing rule, but if all PON interfaces are used, the wavelength conversion routing unit further needs to include: and the electrical signal combiner is used for switching the second optical signal to the normally working passive optical network equipment according to a preset routing rule under the condition that a signal fault exists.
The RE may further include: an optical interface unit, configured to receive the first optical signal and the second optical signal, and decompose or combine the first optical signal and the second optical signal, and further, the optical interface unit includes: wavelength division multiplexer and the two-way ascending-descending multiplexer wave separator of ascending-descending single fiber, wherein, wavelength division multiplexer includes: a downstream wavelength division multiplexer and an upstream wavelength division multiplexer. The Wavelength division multiplexer may be set to WSS (Wavelength Selective Switch).
In addition, the RE may further include a processor or controller having a management function for managing or controlling the wavelength conversion routing unit and the optical interface unit.
In order to solve the problems in the prior art, a fourth embodiment of the present invention provides a long-distance PON transmission device and method, which can implement flexible networking between multiple OLTs and multiple ODNs in a long-distance PON network and service protection of an ONU in an ODN network connected to an OLT when the OLT fails. The specific technical scheme is as follows:
as shown in fig. 3, the long-distance PON transmission device provided in this embodiment includes: an optical interface module (a collection of all PON interfaces), a wavelength conversion routing module (corresponding to the wavelength conversion routing unit in the third embodiment), and a management module (corresponding to a processor or a controller in the third embodiment).
The optical interface module is used for transmitting and distributing downlink WDM optical signals with different wavelengths input from the trunk optical fiber OTL from different OLT equipment to a plurality of optical interfaces of the wavelength conversion routing module, and transmitting and combining uplink WDM optical signals with different wavelengths from the plurality of optical interfaces of the wavelength conversion routing module to the trunk optical fiber.
The wavelength conversion routing module is used for performing wavelength conversion on downlink WDM optical signals with different wavelengths input by the plurality of optical interfaces and from the optical interface module into downlink optical signals with standard PON wavelengths, routing PON signals of different OLT equipment to corresponding ODN networks according to configuration, and converting uplink optical signals with standard PON wavelengths from the plurality of ODN networks into corresponding uplink WDM optical signals.
The management module manages and controls the wavelength conversion routing module and the optical interface module according to a local instruction or a main instruction issued by the OLT, and the management instruction issued by the OLT is transmitted to the management module from the optical interface module through a trunk optical fiber.
Further, the optical interface module or the wavelength conversion routing module further includes an optical link monitoring device to detect an optical signal fault generated by the PON port and send fault information to the management module, and the management module controls the wavelength conversion routing module and the optical interface module according to the received fault information to realize switching of the PON port corresponding to the ODN and recover optical link connection.
Further, the optical interface module or the wavelength conversion routing module further includes an optical amplification unit, which is used for amplifying the uplink and downlink WDM optical signals, so as to further improve the optical power budget of the system.
The embodiments described above are described below with reference to the accompanying drawings and specific examples.
Example one
The apparatus shown in fig. 4 includes an optical interface module, a wavelength conversion routing module, and a management module, where the wavelength conversion routing module includes a wavelength conversion unit and a signal routing unit.
In the downstream direction, the wavelength input from the trunk optical fiber OTL is λW_D1，λW_D2，…，λW_DnThe downstream WDM optical signal is distributed to corresponding wavelength conversion unit interface via optical interface module, and the wavelength conversion unit converts the input downstream WDM optical signal with different wavelengths into optical signal λ of standard PON wavelengthS_D1，λS_D2，…，λS_DnAnd input to the signal routing unit through a different interface. The signal routing unit has a signal routing function and can be flexibly configured to be conducted between any pair of input/output interfaces of n paths of input and n paths of output, and input n paths of PON signals with standard wavelength lambdaS_D1，λS_D2，…，λS_DnRouting output λ as requiredS_Dx1，λS_Dx2，…，λS_DxnAnd the OLT and the ODN are flexibly networked. For example, when the signal routing unit will be λS_D1Route to lambdaS_Dx2Then ODNx2And λW_D1Corresponding OLTs are connected, when the signal routing unit sends lambdaS_D2Route to lambdaS_Dx2Then ODNx2And λW_D2The corresponding OLTs are connected.
Upstream, ODNx1To ODNxnInput lambdaS_Ux1，λS_Ux2，…，λS_UxnThe signal routing unit has a signal routing function and can be flexibly configured to be conducted between any pair of input/output interfaces of n paths of input and n paths of output to enable n paths of input lambda to be conductedS_Ux1，λS_Ux2，…，λS_UxnRouting output to corresponding uplink wavelength conversion unit, standard wavelength PON signal lambdaS_U1，λS_U2，…，λS_UnConverting the input standard PON wavelength optical signal into a downlink WDM optical signal lambda with different wavelengths by a wavelength conversion unitW_U1，λW_U2，…，λW_Un. And then the wavelength is output to the trunk optical fiber OTL through the optical interface module.
In fig. 4, to implement wavelength division of the downlink WDM optical signals and wavelength multiplexing of the uplink WDM optical signals, the optical interface generally includes a downlink wavelength division multiplexing device, an uplink wavelength division multiplexing device, and an uplink and downlink wavelength division multiplexing device that implements uplink and downlink single fiber bidirectional. In order to send the configuration command of the OLT to the management module, the optical interface unit further includes an optical splitter or a wave splitter connected to the management module, as shown in fig. 5.
As shown in fig. 6, the wavelength conversion routing module includes n pairs of uplink and downlink transceivers, where the receiver performs optical-to-electrical conversion of signals, the transmitter performs optical-to-electrical conversion of signals, and the downlink direction implements downlink WDM optical signals λW_DnConversion to optical signals λ of downlink standard wavelengthW_SnAnd realizing the optical signal lambda of the uplink standard wavelength in the uplink directionS_UnConversion to upstream WDM optical signals lambdaW_Un. And the uplink and downlink standard wavelength signals corresponding to the n OLTs are connected to the nxn optical switch matrix through the uplink and downlink multiplexer-demultiplexer. The other side of the n multiplied by n optical switch matrix is connected with n ODN networks, and any pair of OLT and ODN networks can be communicated through the management module to form a signal routing unit, so that flexible networking between the OLT and the ODN is realized. In fig. 6, the uplink transmitters are different WDM wavelength transmitters, which may be fixed WDM wavelength transmitters or tunable WDM wavelength transmitters.
In this embodiment, multiple OTL optical fibers may be included, and when the multiple OTL optical fibers are input to the RE device, the multiple OTL optical fibers respectively carry a downlink optical signal transmitted by the PON port connected to the optical fibers and a received uplink optical signal, at this time, a downlink receiver and an uplink transmitter in the wavelength conversion unit receive and transmit a standard wavelength optical signal, and the wavelength conversion unit only performs optical-electrical-optical conversion on optical power, and does not perform wavelength conversion. In addition, in the wavelength conversion unit, an optical amplifier may be used instead of the optical-electrical signal converter to realize optical power conversion of the standard wavelength optical signal.
The present embodiment further provides a long-distance PON transmission method, including the following steps:
the method comprises the following steps: the optical interface unit demultiplexes the different OLT downstream WDM optical signals received from the OTL to the wavelength conversion unit, and multiplexes the upstream WDM optical signals received from the wavelength conversion unit to the OTL.
Step two: the wavelength conversion unit respectively converts the multiple paths of downlink WDM optical signals into multiple paths of downlink standard wavelength optical signals and converts the multiple paths of uplink standard optical signals into multiple paths of uplink WDM optical signals.
Step three: the signal routing unit routes optical signals corresponding to different OLTs to different ODN networks and routes optical signals of different ODN networks to corresponding different OLTs.
Example two
The invention provides a long-distance PON transmission method, which comprises the following steps:
the method comprises the following steps: according to networking requirements, the RE device is configured to be connected with the OLTa and the ODNb, and the OLTa and the OLTc are configured to be switched between the main and standby devices.
Step two: when the OLTa PON port fails, the optical path monitoring device in the RE device detects that the downlink WDM optical signal corresponding to the OLTa is abnormal, and informs the RE device management module.
Step three: the RE device notifies the signal routing module to switch the connection relationship of ODNb to OLTc (and notifies OLTc) according to the received signal abnormality information.
Step four: and the OLTc is connected with the ODNb, the OLTc switches to the standby OLTc according to the received information reported by the RE device, or the ONU corresponding to the ODNb recovers the service by monitoring the service loss.
In order to implement the foregoing transmission method, the RE apparatus needs to include an optical signal monitoring device, and according to the first embodiment, the long-distance PON transmission RE apparatus is improved as follows: and an optical splitter and an optical power detector are added at the output port of the downstream wavelength division multiplexing device, the optical power detector is connected with the output ports of the wavelength division multiplexing devices through the optical splitter and is connected with the management module, and the obtained output optical signals of the wavelength division multiplexing devices are abnormally transmitted to the management module. And the optical signals at the output ports of different wavelength division multiplexers correspond to different OLT downlink signals, so that the fault of the OLT PON port is judged. Fig. 7 shows an optical signal monitoring scheme of an optical interface module according to a second embodiment of the present invention.
Example three
Fig. 8 is a block diagram of a RE device according to a third embodiment of the present invention, where the RE device includes an optical interface module, a wavelength conversion routing module and a management module, and the wavelength conversion routing module includes a photoelectric conversion unit, an electro-optical conversion unit and an electrical signal routing unit, so as to implement wavelength conversion and routing functions.
The difference from the first example is that the signal routing function of the first example is implemented by an optical switch array, which is independent of the wavelength conversion function, while the signal routing function of the third example is implemented by an electrical switch array, which performs wavelength conversion simultaneously. In addition, a downlink optical amplifier and an uplink optical amplifier can be respectively added between the uplink/downlink multiplexer/demultiplexer and the downlink wavelength division multiplexer/demultiplexer and between the uplink wavelength division multiplexer/demultiplexer in the optical interface module.
Example four
In the third embodiment, when a certain OLT fails, the ODN corresponding to the OLT needs to be connected to other standby OLTs through the electrical signal routing unit of the RE device, and the standby OLT is connected to only one ODN. With the device described in the fourth embodiment, when a certain OLT fails, the ODN corresponding to the OLT may be connected to other OLTs connected to other ODNs through the electrical signal routing unit of the RE device, so as to implement protection switching. At this time, the RE routes two ODNs to one OLT device.
The basic functional block diagram of the present invention is the same as that of the third embodiment, but the electrical signal routing unit is different from that of the third embodiment, and in the fourth embodiment, the electrical signal routing unit includes, in addition to the electrical switch array, an electrical signal combiner, for example, taking any one of two paths of signals in the following row directions a and b, and as shown in fig. 9, the schematic diagram of the front and rear signal routing units is protected, and the following processes are implemented:
according to networking requirements, the RE device is configured to be connected with the OLTa and the ODNa, the OLTb is connected with the ODNb, and the OLTa and the OLTb are configured to be switched between the main device and the standby device; when an OLTb PON port fails, an optical path monitoring device in the RE device detects a downlink WDM optical signal lambda corresponding to the OLTbW_DbNotifying the RE device management module of the exception; the RE device informs the electric signal routing module of switching according to the received signal abnormal information, and the ODNb is simultaneously connected to the OLTa (and informs the OLTa) through the combiner; and the OLTb is connected with the ODNa, the OLTa informs the OLTa after monitoring that the service is lost according to the received information reported by the RE device, or the OLTb monitors that the service is lost, the OLTa combines the ODNa service and the ODNb service, and bandwidth allocation is carried out again.
Example five
Fig. 10 is a block diagram of an RE device according to a fifth embodiment of the present invention, where the RE device includes an optical interface module, a wavelength conversion routing module and a management module, and the wavelength conversion routing module includes a photoelectric conversion unit and an electrical signal routing unit, and implements wavelength conversion and routing functions.
The difference from the first and third examples is that the fifth example does not have a separate signal routing unit, and the signal routing function is realized by the downstream wavelength tuning receiver and the upstream wavelength tuning transmitter. When the ODN needs to be connected to a certain OLT, the receiving wavelength of the downstream wavelength tuning receiver and the transmitting wavelength of the upstream wavelength tuning transmitter need to be adjusted to the corresponding WDM wavelength.
When the wavelength division multiplexing device in the optical interface module adopts a variable wavelength division multiplexing device, such as a WSS (wavelength selective Switch), the downlink receivers corresponding to different WDM downlink wavelengths can be controlled by the WSS device, so that the receiver can be a wide-spectrum receiver without a wavelength tunable receiver.
When a downlink adjustable receiver is adopted, the downlink wavelength division multiplexing device and the uplink wavelength division multiplexing device in the optical interface module can share one optical splitter to realize, and the wavelength selection is realized through the adjustable receiver and the transmitter.
In a specific implementation, an amplifier unit may be further added to the wavelength conversion routing module, and specifically, an optical amplification unit may be added between the optical interface unit and the wavelength conversion unit on the basis of fig. 4.
Although the preferred embodiments of the present invention have been disclosed for illustrative purposes, those skilled in the art will appreciate that various modifications, additions and substitutions are possible, and the scope of the invention should not be limited to the embodiments described above.
Claims (14)
1. A method of transmitting an optical signal, comprising:
converting the received first optical signal into a second optical signal;
and routing the second optical signal to the corresponding passive optical network equipment according to a preset routing rule.
2. The method of claim 1, wherein the passive optical network device comprises: an optical line termination OLT or an optical distribution network ODN.
3. The method of claim 1, wherein converting the received first optical signal to a second optical signal comprises:
and when the first optical signal and the second optical signal are standard PON wavelength signals at the same time, performing optical power conversion on the first optical signal to convert the first optical signal into the second optical signal.
4. The method of claim 1, wherein converting the received first optical signal to a second optical signal comprises:
carrying out optical power and wavelength conversion on a plurality of downlink wavelength division multiplexing WDM optical signals input by a plurality of OLTs so as to convert the optical signals into standard PON wavelength downlink optical signals; or,
and carrying out optical power and wavelength conversion on a plurality of standard PON wavelength uplink optical signals input by a plurality of ODNs so as to convert the optical signals into uplink WDM optical signals.
5. The method of any of claims 1 to 4, wherein routing the second optical signal to the corresponding passive optical network device according to a preset routing rule comprises:
detecting whether a signal fault exists in an optical signal corresponding to the passive optical network equipment to be routed;
under the condition that a signal fault exists, switching or combining the second optical signal to preset passive optical network equipment according to the preset routing rule;
wherein, the preset passive optical network device comprises: spare idle passive optical network equipment or normally working passive optical network equipment.
6. A passive optical network transmission system comprising a passive optical network device and a distance extension apparatus RE, wherein the RE comprises:
and the wavelength conversion routing unit is used for converting the received first optical signal into a second optical signal and routing the second optical signal to the corresponding passive optical network equipment according to a preset routing rule.
7. The passive optical network transmission system of claim 6, wherein the passive optical network device comprises: an optical line termination OLT or an optical distribution network ODN.
8. The passive optical network transmission system of claim 6, wherein the wavelength conversion routing unit comprises:
the N-by-N optical switch array or the N-by-N electric switch array is used for signal routing; and the number of the first and second groups,
a switching device, the switching device comprising: an optical-to-electrical signal converter for converting the optical power or wavelength of the first optical signal to the second optical signal; or, the optical amplifier is used for converting the optical power of the first optical signal to convert the first optical signal into the second optical signal.
9. The passive optical network transmission system of claim 6, wherein the wavelength conversion routing unit comprises: a wavelength-variable optical-to-electrical signal converter.
10. The passive optical network transmission system of claim 8 or 9, wherein the wavelength conversion routing unit further comprises:
the optical link monitor is used for detecting whether a signal fault exists in an optical signal to be routed;
and the N-by-N optical switch array or the N-by-N electric switch array switches the second optical signal to the spare idle passive optical network equipment according to the preset routing rule under the condition that a signal fault exists.
11. The passive optical network transmission system of claim 10, wherein the wavelength conversion routing unit further comprises:
and the electrical signal combiner is used for combining the second optical signal to the normally working passive optical network equipment connected with the electrical signal combiner according to the preset routing rule under the condition that a signal fault exists.
12. The passive optical network transmission system of claim 6, wherein the RE further comprises: and the optical interface unit is used for receiving the first optical signal and the second optical signal and decomposing or combining the first optical signal and the second optical signal.
13. The passive optical network transmission system of claim 12, wherein the optical interface unit comprises: wavelength division multiplexer and the ascending-descending of ascending-descending single fiber two-way up-descending multiplexer wave-divider, wherein, wavelength division multiplexer includes: a downstream wavelength division multiplexer and an upstream wavelength division multiplexer.
14. The passive optical network transmission system of claim 13, wherein the wavelength division multiplexer includes a wavelength selective switch WSS.
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