Optical terminal multiplexer, optical control method, apparatus, and system

Abstract

The present application provides a first optical terminal multiplexer (OTM), an optical control method, an apparatus, and a system, capable of being applied to an optical transport network. The first OTM comprises a first wavelength selective switch (WSS) and a first coupler; the first WSS is configured to receive a first service optical signal of a first wavelength and a first dummy optical signal of a second wavelength, combine the first service optical signal and the first dummy optical signal, and transmit a combined signal to the first coupler; and the first coupler is configured to combine the first service optical signal and the first dummy optical signal and transmit the combined signal to an optical fiber. The first WSS in the first OTM provided by the present application, as an access component for the first service optical signal and the first dummy optical signal, supports bandwidth adjustment and attenuation control of ports, preventing conflict between the first dummy optical signal and the first service optical signal; in addition, by introducing the first coupler, parallel operation of multiple WSSs can be supported, meeting the requirements for large-scale add / drop operations in the OTM, and improving system transmission performance.

Description

Optical terminal multiplexer, optical control method, device and system

[0001] The present application claims priority from the Chinese patent application No. 202410606709.X filed on May 13, 2024, and entitled "Optical terminal multiplexer, optical control method, device and system", the content of which is incorporated herein by reference in its entirety. TECHNICAL FIELD

[0002] The present application relates to the field of optical communication, and more particularly, to an optical terminal multiplexer, an optical control method, a device and a system. BACKGROUND

[0003] An optical terminal multiplexer (OTM) site is a typical site in a wavelength division multiplexing (WDM) transmission system network.

[0004] For example, an OTM site applied to a C band generally adopts a combined architecture of an arrayed waveguide grating (AWG) and an interleaver (ITL) to realize a multiplexing / demultiplexing function. For another example, an OTM site applied to a C+L band superimposes a set of wavelength selective switches (WSSs) on a traditional AWG multiplexing scheme, which can perform wavelength-level trimming and power adjustment on an incoming wide-spectrum dummy light (DML) signal to meet the application requirements of the system. However, relying on WSSs for multiplexing / demultiplexing processing cannot meet the large-volume up / down wave requirements of the OTM site, and often requires cascading AWGs for port number expansion, which will lose the characteristics of flexible and adjustable passband bandwidth of the WSSs, and has great defects in cost, integration and evolution.

[0005] Therefore, how to design an optical terminal multiplexer to meet the large-volume up / down wave requirements of the OTM and improve the transmission performance of the system is a problem to be considered. SUMMARY

[0006] The present application provides an optical terminal multiplexer, an optical control method, a device and a system, which can meet the transmission requirements of the OTM up / down wave and improve the transmission performance of the system.

[0007] In a first aspect, a first optical terminal multiplexer is provided, which comprises a first wavelength selective switch (WSS) and a first coupler; the first WSS is configured to receive a first service optical signal of a first wavelength and a first dummy optical signal of a second wavelength, combine the first service optical signal and the first dummy optical signal, and transmit the combined first service optical signal and first dummy optical signal to a first port of the first coupler, wherein the first dummy optical signal is used to fill idle channels other than the channel of the first service optical signal in the first WSS, and the first wavelength is different from the second wavelength; and the first coupler is configured to combine the first service optical signal and the first dummy optical signal to obtain a first optical signal, and transmit the first optical signal to an optical fiber.

[0008] Exemplarily, the first OTM is applicable to a transmission system of a C band, an L band, or a C+L band.

[0009] Based on the above scheme, the first OTM comprising the first WSS and the first coupler is designed, wherein the first WSS is configured to receive the first service optical signal of the different wavelength and the first dummy optical signal, combine the first service optical signal and the first dummy optical signal, and transmit the combined first service optical signal and first dummy optical signal to the first coupler, and then output the first optical signal from the first coupler to the optical fiber. That is, the first WSS in the first OTM serves as an access component of the first service optical signal and the first dummy optical signal, the first dummy optical signal is used for filling the idle channels, the introduction of the first dummy optical signal can control the SRS effect of the optical fiber, ensure the stability and safety of the service signal, the first WSS has the wavelength-level on-off control (or the bandwidth adjustment of the port) and the attenuation adjustment capability, and can prevent the conflict between the first dummy optical signal and the first service optical signal. Compared with the AWG architecture, the service signal is directly accessed by the WSS in the present architecture, and thus the present architecture is no longer limited by the fixed channel bandwidth of the AWG. The WSS can flexibly configure the channel bandwidth, support the simultaneous access of different bit rate signals, and has the ability of intergenerational evolution. In addition, the introduction of the first coupler can support the parallel work of multiple WSSs, the number of ports for signal access can be doubled, has the ability of large-scale uplink and downlink, meets the transmission requirements of large-scale uplink and downlink of the first OTM, improves the system transmission performance, and reduces the cost.

[0010] In a possible design, the first OTM further comprises a second WSS; the second WSS is configured to receive a second service optical signal of a third wavelength, and transmit the second service optical signal to a second port of the first coupler; and the first coupler is further configured to combine the first optical signal and the second service optical signal, and output the combined first optical signal and second service optical signal to the optical fiber.

[0011] Based on the above scheme, the first OTM comprises multiple WSSs, and each WSS supports receiving a service optical signal of a different wavelength, wherein the first wavelength and the third wavelength can belong to a C band and / or an L band. In the first OTM architecture, the first coupler can support the parallel work of multiple WSSs (for example, the first WSS and the second WSS), so as to meet the transmission requirements of large-scale uplink and downlink of the first OTM, and improve the system transmission performance.

[0012] In a possible design, the first OTM further includes a second WSS; the second WSS is configured to receive a second service optical signal of a third wavelength and a second dummy optical signal of a second wavelength, perform wavelength multiplexing on the second service optical signal and the second dummy optical signal, and transmit to a second port of the first coupler, where the second dummy optical signal is used to fill idle channels other than a channel where the first service optical signal is located in the first WSS and a channel where the second service optical signal is located in the second WSS, and the first wavelength, the third wavelength, and the second wavelength are different; and the first coupler is further configured to perform wavelength multiplexing on the first optical signal and a second optical signal and output to an optical fiber, where the second optical signal is obtained by performing wavelength multiplexing on the second service optical signal and the second dummy optical signal.

[0013] Optionally, a plurality of WSSs expanded in parallel by the first coupler are regarded as a group, and the WSSs in the same group are configured to perform mutual exclusion detection of channel crossing by software, to prevent wavelength conflict at the first coupler, that is, the first wavelength and the third wavelength are different, and can both belong to a C band and / or an L band.

[0014] Based on the foregoing scheme, the first OTM includes a plurality of WSSs, each of which supports receiving service optical signals and dummy optical signals of different wavelengths, and in the architecture of the first OTM, the first coupler can support parallel operation of the plurality of WSSs (for example, the first WSS and the second WSS) to meet the transmission requirement of a large number of uplink and downlink waves of the first OTM, and improve the transmission performance of the system. The dummy optical signals accessed by the plurality of WSSs in the same group are mutually backed up, for example, the first dummy optical signal and the second dummy optical signal, which can resist failure of the dummy optical signal and prevent service signal interruption caused by failure of the dummy optical signal.

[0015] In this application, the plurality of WSSs (for example, the first WSS and the second WSS) connected to the same coupler (for example, the first coupler) are centrally controlled, and the service ports are subjected to wavelength mutual exclusion checking by software; the plurality of WSSs (for example, the first WSS and the second WSS) connected to the same coupler (for example, the first coupler) are centrally controlled, and the dummy optical ports are subjected to mutual exclusion checking of signal wavelengths by software, and the same frequency access of the dummy optical wavelengths.

[0016] In a possible design, the first OTM further includes a first variable optical attenuator (VOA) and a second VOA, where the first VOA is connected to the first port of the first coupler, and the second VOA is connected to the second port of the first coupler; the first VOA is configured to enable the first optical signal to pass through the first port of the first coupler; and the second VOA is configured to enable the second optical signal to pass through the second port of the first coupler.

[0017] In a possible design, the first OTM further includes a third VOA, and the third VOA is connected with the third port of the first coupler, and when the third port of the first coupler is not connected with the WSS, the third VOA is controlled to block an external non-signal interference source.

[0018] Based on the foregoing scheme, the VOA controls the light path of each port of the first coupler to be interrupted or not interrupted, thereby preventing external light attack of a non-used port from affecting the normal work of a service light signal of another working port.

[0019] In a possible design, the first wavelength belongs to a C band or an L band, the third wavelength belongs to the C band or the L band, and the second wavelength belongs to a C+L band.

[0020] In a possible design, the first OTM further includes a second coupler, and the first WSS is further configured to receive a fourth service light signal of a fourth wavelength, perform wavelength multiplexing processing on the fourth service light signal and the first dummy light signal, and output the processed light signal to the first port of the first coupler or the first port of the second coupler.

[0021] The first wavelength and the fourth wavelength are different, and each of the first wavelength and the fourth wavelength can belong to a C band and / or an L band.

[0022] Based on the foregoing scheme, the first WSS can be an integrated WSS, the integrated WSS is used as a wavelength multiplexing / demultiplexing interface of the service light signal, supports service access and attenuation adjustment of an arbitrary wavelength (including a C+L full band) and an arbitrary channel spacing, and is used as an access interface of the dummy light signal, supports on-off control and attenuation adjustment of the dummy light signal.

[0023] In a possible design, when the first coupler corresponds to a C band and the second coupler corresponds to an L band, the first wavelength belongs to the C band; the first coupler is further configured to output, to an optical fiber, a light signal obtained by performing wavelength multiplexing processing on a C band part of the first service light signal and the first dummy light signal; if the fourth wavelength belongs to the L band, the second coupler is configured to output, to the optical fiber, a light signal obtained by performing wavelength multiplexing processing on an L band part of the fourth service light signal and the first dummy light signal; and if the fourth wavelength belongs to the C band, the first coupler is further configured to output, to the optical fiber, a light signal obtained by performing wavelength multiplexing processing on a C band part of the fourth service light signal and the first dummy light signal.

[0024] In a possible design, the first OTM further includes a third WSS, the third WSS is configured to receive a fifth service light signal of a fifth wavelength and output the fifth service light signal to the second port of the first coupler or the second port of the second coupler; if the fifth wavelength belongs to a C band, the first coupler is further configured to output, to an optical fiber, a light signal obtained by performing wavelength multiplexing processing on a C band part of the fifth service light signal, the first service light signal, and the first dummy light signal; and if the fifth wavelength belongs to an L band, the second coupler is configured to output, to the optical fiber, the fifth service light signal.

[0025] Based on the above scheme, the first OTM further comprises a third WSS, the first coupler supports parallel operation of multiple WSSs, the number of ports available for signal access is multiplied, the capacity of large batch of uplink and downlink waves is possessed, the transmission demand of the first OTM for large batch of uplink and downlink waves is met, the cost overhead is reduced, and the system transmission performance is improved. The first OTM can support adding the number of WSSs as the customer traffic increases, and does not affect the normal operation of the existing services.

[0026] In a possible design, the first OTM further comprises a third WSS; the third WSS is configured to receive a fifth service optical signal of a fifth wavelength and a third dummy optical signal of a second wavelength, perform wavelength multiplexing processing on the fifth service optical signal and the third dummy optical signal, and output to a second port of the first coupler or a second port of the second coupler. The third dummy optical signal is used to fill the idle wave channels in the first WSS except the wave channels where the first service optical signal and the fourth service optical signal are located, and the third WSS except the wave channel where the fifth service optical signal is located.

[0027] Optionally, the multiple WSSs expanded in parallel by the first coupler are regarded as a group, and the WSSs in the same group implement mutual exclusion detection of channel crossing through software to prevent wavelength conflict at the first coupler, that is, the first wavelength and the fifth wavelength are different, and both can belong to the C band and / or the L band.

[0028] Based on the above scheme, the first OTM comprises multiple WSSs, each WSS supports receiving service optical signals and dummy optical signals of different wavelengths, in the architecture of the first OTM, the first coupler can support parallel operation of multiple WSSs (for example, the first WSS and the third WSS) to meet the transmission demand of the first OTM for large batch of uplink and downlink waves and improve the system transmission performance. The dummy optical signals accessed by the multiple WSSs in the same group are mutually backed up, for example, the first dummy optical signal and the third dummy optical signal can resist failure of the dummy optical signal and prevent service signal interruption caused by failure of the dummy optical signal.

[0029] In the present application, the multiple WSSs (for example, the first WSS and the third WSS) connected to the same coupler (for example, the first coupler) are centrally controlled, and the service ports are subjected to wavelength mutual exclusion verification by software; the multiple WSSs (for example, the first WSS and the third WSS) connected to the same coupler (for example, the first coupler) are centrally controlled, and the dummy optical ports are subjected to mutual exclusion verification of signal wavelengths by software, and the same frequency access of the dummy optical wavelengths.

[0030] In a possible design, if the fifth wavelength belongs to the C band, the first coupler is further configured to output, to the optical fiber, an optical signal obtained by combining the fifth service optical signal and a C band part of the third dummy optical signal; and if the fifth wavelength belongs to the L band, the second coupler is configured to output, to the optical fiber, an optical signal obtained by combining the fifth service optical signal and an L band part of the third dummy optical signal.

[0031] In a possible design, the first OTM supports M1*N1 optical signal accesses, where M1 represents the number of input ports of the first WSS, N1 represents the number of input ports of the first coupler, and M1 and N1 are both integers greater than 1.

[0032] Based on the above scheme, compared with the current industry WSS whose port number is generally less than 30 and it is still technically difficult to increase the port number, by introducing the first coupler, the parallel work of multiple WSSs can be supported, the port number for signal access can be doubled, the capacity of large-scale uplink and downlink waves can be supported, the transmission requirement of the first OTM for large-scale uplink and downlink waves can be met, the system transmission performance can be improved, and the cost can be reduced.

[0033] In a second aspect, a second optical terminal multiplexer is provided. The second optical terminal multiplexer includes a fourth wavelength selective switch (WSS) and a first splitter; the first splitter is configured to receive a first optical signal from an optical fiber, perform wavelength division processing on the first optical signal to obtain a first service optical signal of a first wavelength and a first dummy optical signal of a second wavelength, and output the first service optical signal to a first port of the fourth WSS; and the fourth WSS is configured to receive the first service optical signal from the first port of the first splitter, and output the first service optical signal.

[0034] Based on the above scheme, the second OTM including the fourth WSS and the first splitter is designed, where the first splitter receives a first optical signal from an optical fiber, performs wavelength division processing on the first optical signal to obtain a first service optical signal of a first wavelength and a first dummy optical signal of a second wavelength, and outputs the first service optical signal to a first port of the fourth WSS. The second OTM provided in this application can support the parallel work of multiple WSSs, support the bandwidth adjustment and attenuation control of the ports, to meet the transmission requirement of the first OTM for supporting large-scale uplink and downlink waves, and improve the system transmission performance.

[0035] In a possible design, the second OTM further includes a fifth WSS; the first splitter is further configured to receive a second service optical signal of a third wavelength from the optical fiber, and output the second service optical signal to a first port of the fifth WSS; and the fifth WSS is configured to receive the second service optical signal from a second port of the first splitter, and output the second service optical signal.

[0036] In a possible design, the second OTM further includes a fifth WSS; the first splitter is further configured to receive the second optical signal from the optical fiber, perform wavelength division processing on the second optical signal to obtain a second service optical signal of a third wavelength and a second dummy optical signal of a second wavelength, and output the second service optical signal to a first port of the fifth WSS; and the fifth WSS is configured to receive the second service optical signal from a second port of the first splitter, and output the second service optical signal.

[0037] In a possible design, the first wavelength belongs to a C band or an L band, and the third wavelength belongs to the C band or the L band, and the second wavelength belongs to a C+L band.

[0038] In a possible design, the second OTM further includes a second splitter; when the first splitter corresponds to the C band and the second splitter corresponds to the L band, the first wavelength belongs to the C band; if the fourth wavelength belongs to the L band, the second splitter is configured to receive an optical signal from the optical fiber, perform wavelength division processing on the optical signal to obtain a fourth service optical signal of the fourth wavelength and an L band part of the first dummy optical signal, and output the fourth service optical signal to a second port of the fourth WSS; if the fourth wavelength belongs to the C band, the first splitter is further configured to receive the optical signal from the optical fiber, perform wavelength division processing on the optical signal to obtain the fourth service optical signal and a C band part of the first dummy optical signal, and output the fourth service optical signal to a first port of the fourth WSS.

[0039] In a possible design, the second OTM further includes a sixth WSS; if the fifth wavelength belongs to the C band, the first splitter is further configured to receive the optical signal from the optical fiber, perform wavelength division processing on the optical signal to obtain a fifth service optical signal and a C band part of the third dummy optical signal, and output the fifth service optical signal to a first port of the sixth WSS; if the fifth wavelength belongs to the L band, the second splitter is configured to receive the optical signal from the optical fiber, perform wavelength division processing on the optical signal to obtain a fifth service optical signal of the fifth wavelength and an L band part of the third dummy optical signal of the second wavelength, and output the fifth service optical signal to a second port of the sixth WSS.

[0040] In a possible design, the second OTM supports M2*N2 optical signal outputs, where M2 represents a number of output ports of the fourth WSS, N2 represents a number of output ports of the first splitter, and M2 and N2 are both integers greater than 1.

[0041] In a third aspect, an optical terminal multiplexer (OTM) system is provided. The OTM system includes a first OTM and a second OTM, the first OTM includes a first wavelength selective switch (WSS) and a first coupler, and the second OTM includes a fourth WSS and a first splitter. The first OTM and the second OTM are connected through an optical fiber.

[0042] Exemplarily, the first WSS is configured to receive a first service optical signal of a first wavelength and a first dummy optical signal of a second wavelength, combine the first service optical signal and the first dummy optical signal, and transmit the combined first service optical signal and first dummy optical signal to a first port of the first coupler, wherein the first dummy optical signal is used to fill idle channels of the first WSS except for a channel of the first service optical signal, and the first wavelength is different from the second wavelength; the first coupler is configured to transmit a first optical signal obtained by combining the first service optical signal and the first dummy optical signal to the optical fiber; the first splitter is configured to receive the first optical signal from the optical fiber, split the first optical signal to obtain the first service optical signal of the first wavelength and the first dummy optical signal of the second wavelength, and output the first service optical signal to a first port of the fourth WSS; and the fourth WSS is configured to receive the first service optical signal from the first port of the first splitter and output the first service optical signal.

[0043] Alternatively, an optical terminal multiplexer (OTM) system includes an optical fiber, a first OTM as in the first aspect, and a second OTM as in the second aspect, wherein the optical fiber connects the first OTM and the second OTM.

[0044] In the first OTM and the second OTM, the relevant descriptions can be referred to the relevant descriptions of the first aspect and the second aspect respectively, and will not be repeated here for brevity.

[0045] In the fourth aspect, a wavelength division multiplexing (WDM) system is provided. The WDM system includes an optical line amplifier (OLA), a first optical terminal multiplexer (OTM) and a second OTM, the first OTM includes a first wavelength selective switch (WSS) and a first coupler, and the second OTM includes a fourth WSS and a first splitter.

[0046] Exemplarily, the first WSS is configured to receive a first service optical signal of a first wavelength and a first dummy optical signal of a second wavelength, combine the first service optical signal and the first dummy optical signal, and transmit the combined first service optical signal and first dummy optical signal to a first port of the first coupler, wherein the first dummy optical signal is used to fill idle channels of the first WSS except for a channel of the first service optical signal, and the first wavelength is different from the second wavelength; the first coupler is configured to transmit a first optical signal obtained by combining the first service optical signal and the first dummy optical signal to the optical fiber; the first splitter is configured to receive the first optical signal from the optical fiber, split the first optical signal to obtain the first service optical signal of the first wavelength and the first dummy optical signal of the second wavelength, and output the first service optical signal to a first port of the fourth WSS; and the fourth WSS is configured to receive the first service optical signal from the first port of the first splitter and output the first service optical signal.

[0047] Or, a wavelength division multiplexing (WDM) system. The WDM system comprises an optical line amplifier (OLA), a first optical terminal multiplexer (OTM) as the first aspect, and a second OTM as the second aspect. The OLA is configured to receive a first optical signal from an optical fiber, amplify the first optical signal, and output the first optical signal to the second OTM. The first optical signal is obtained by combining a first service optical signal and a first dummy optical signal.

[0048] The descriptions of the first OTM and the second OTM can refer to the descriptions of the first aspect and the second aspect, respectively. For brevity, the descriptions are not repeated here.

[0049] In a fifth aspect, an optical control method is provided. The method is applied to an optical terminal multiplexer (OTM) system, which comprises a first OTM and a second OTM. The first OTM comprises a first wavelength selective switch (WSS) and a first coupler. The second OTM comprises a fourth WSS and a first splitter.

[0050] The method comprises the following steps. The first WSS is controlled to receive a first service optical signal of a first wavelength and a first dummy optical signal of a second wavelength, combine the first service optical signal and the first dummy optical signal, and transmit the combined first service optical signal and first dummy optical signal to a first port of the first coupler. The first dummy optical signal is used to fill idle channels other than the channel of the first service optical signal in the first WSS. The first wavelength and the second wavelength are different. The first coupler is controlled to combine the first service optical signal and the first dummy optical signal, and transmit the combined first optical signal to an optical fiber. The first splitter is controlled to receive the first optical signal from the optical fiber, split the first optical signal to obtain the first service optical signal of the first wavelength and the first dummy optical signal of the second wavelength, and output the first service optical signal to a first port of the fourth WSS. The fourth WSS is controlled to receive the first service optical signal from the first port of the first splitter, and output the first service optical signal.

[0051] In a possible design, the first OTM further comprises a second WSS. The method further comprises the following steps. The second WSS is controlled to receive a second service optical signal of a third wavelength, and transmit the second service optical signal to a second port of the first coupler. The first coupler is controlled to combine the first optical signal and the second service optical signal, and output the combined first optical signal and second service optical signal to the optical fiber.

[0052] In a possible design, the first OTM further includes a second WSS. The method further includes: controlling the second WSS to receive a second service optical signal of a third wavelength and a second dummy optical signal of a second wavelength, to perform wavelength multiplexing processing on the second service optical signal and the second dummy optical signal, and to transmit to a second port of the first coupler, where the second dummy optical signal is used to fill idle channels in the first WSS except for a channel in which the first service optical signal is located and in the second WSS except for a channel in which the second service optical signal is located, and the first wavelength, the third wavelength, and the second wavelength are different; and controlling the first coupler to perform wavelength multiplexing processing on the first optical signal and a second optical signal, and to output to the optical fiber, where the second optical signal is obtained by performing wavelength multiplexing processing on the second service optical signal and the second dummy optical signal.

[0053] In a possible design, the first OTM further includes a first variable optical attenuator (VOA) and a second VOA, where the first VOA is connected to the first port of the first coupler, and the second VOA is connected to the second port of the first coupler. The method further includes: controlling the first VOA to enable the first optical signal to pass through the first port of the first coupler; and controlling the second VOA to enable the second optical signal to pass through the second port of the first coupler.

[0054] In a possible design, the first OTM further includes a third VOA. The method further includes: controlling the third VOA to be connected to the third port of the first coupler. The method further includes: when the third port of the first coupler is not connected to a WSS, controlling the third VOA to block an external non-signal interference source.

[0055] In a possible design, the first wavelength belongs to a C band or an L band, the third wavelength belongs to the C band or the L band, and the second wavelength belongs to a C+L band.

[0056] In a possible design, the first OTM further includes a second coupler. The method further includes: controlling the first WSS to further receive a fourth service optical signal of a fourth wavelength, to perform wavelength multiplexing processing on the fourth service optical signal and the first dummy optical signal, and to output to the first port of the first coupler or the first port of the second coupler.

[0057] In a possible design, when the first coupler corresponds to a C band and the second coupler corresponds to an L band, the first wavelength belongs to the C band. The method further includes: controlling the first coupler to further output, to the optical fiber, an optical signal obtained by performing wavelength multiplexing processing on a C band part of the first service optical signal and the first dummy optical signal; if the fourth wavelength belongs to the L band, controlling the second coupler to output, to the optical fiber, an optical signal obtained by performing wavelength multiplexing processing on an L band part of the fourth service optical signal and the first dummy optical signal; and if the fourth wavelength belongs to the C band, controlling the first coupler to further output, to the optical fiber, an optical signal obtained by performing wavelength multiplexing processing on a C band part of the fourth service optical signal and the first dummy optical signal.

[0058] In a possible design, the first OTM further includes a third WSS. The method further includes: controlling the third WSS to receive a fifth service optical signal of a fifth wavelength and a third dummy optical signal of a second wavelength, and to perform wavelength multiplexing on the fifth service optical signal and the third dummy optical signal and output to the second port of the first coupler or the second port of the second coupler, the third dummy optical signal being used to fill idle channels in the first WSS except for channels of the first service optical signal and the fourth service optical signal and in the third WSS except for a channel of the fifth service optical signal.

[0059] In a possible design, the first OTM further includes a third WSS. The method further includes: controlling the third WSS to receive a fifth service optical signal of a fifth wavelength and a third dummy optical signal of a second wavelength, and to perform wavelength multiplexing on the fifth service optical signal and the third dummy optical signal and output to the second port of the first coupler or the second port of the second coupler, the third dummy optical signal being used to fill idle channels in the first WSS except for channels of the first service optical signal and the fourth service optical signal and in the third WSS except for a channel of the fifth service optical signal.

[0060] In a possible design, the method further includes: if the fifth wavelength belongs to the C band, controlling the first coupler to further perform wavelength multiplexing on the fifth service optical signal and a C band part of the third dummy optical signal and output the multiplexed optical signal to the optical fiber; and if the fifth wavelength belongs to the L band, controlling the second coupler to perform wavelength multiplexing on the fifth service optical signal and an L band part of the third dummy optical signal and output the multiplexed optical signal to the optical fiber.

[0061] In a possible design, the second OTM further includes a fifth WSS. The method further includes: controlling the first splitter to further receive a second service optical signal of a third wavelength from the optical fiber and output to a first port of the fifth WSS; and controlling the fifth WSS to receive the second service optical signal from a second port of the first splitter and output the second service optical signal.

[0062] In a possible design, the second OTM further includes a fifth WSS. The method further includes: controlling the first splitter to further receive a second optical signal from the optical fiber, perform wavelength demultiplexing on the second optical signal to obtain a second service optical signal of a third wavelength and a second dummy optical signal of a second wavelength, and output the second service optical signal to a first port of the fifth WSS; and controlling the fifth WSS to receive the second service optical signal from a second port of the first splitter and output the second service optical signal.

[0063] In a possible design, the second OTM further includes a second splitter. When the first splitter corresponds to the C band and the second splitter corresponds to the L band, the first wavelength belongs to the C band. The method further includes: if the fourth wavelength belongs to the L band, controlling the second splitter to receive the optical signal from the optical fiber, performing wavelength division processing on the optical signal to obtain a fourth service optical signal of the fourth wavelength and an L-band part of the first dummy optical signal, and outputting the fourth service optical signal to a second port of the fourth WSS; and if the fourth wavelength belongs to the C band, controlling the first splitter to further receive the optical signal from the optical fiber, performing wavelength division processing on the optical signal to obtain the fourth service optical signal and a C-band part of the first dummy optical signal, and outputting the fourth service optical signal to a first port of the fourth WSS.

[0064] In a possible design, the second OTM further includes a sixth WSS. The method further includes: if the fifth wavelength belongs to the C band, controlling the first splitter to further receive the optical signal from the optical fiber, performing wavelength division processing on the optical signal to obtain a fifth service optical signal and a C-band part of the third dummy optical signal, and outputting the fifth service optical signal to a first port of the sixth WSS; and if the fifth wavelength belongs to the L band, controlling the second splitter to receive the optical signal from the optical fiber, performing wavelength division processing on the optical signal to obtain a fifth service optical signal of the fifth wavelength and an L-band part of the third dummy optical signal of the second wavelength, and outputting the fifth service optical signal to a second port of the sixth WSS.

[0065] In a possible design, the first OTM supports M1*N1 optical signal access, where M1 represents a number of input ports of the first WSS, N1 represents a number of input ports of the first coupler, and M1 and N1 are both integers greater than 1.

[0066] In a possible design, the second OTM supports M2*N2 optical signal output, where M2 represents a number of output ports of the fourth WSS, N2 represents a number of output ports of the first splitter, and M2 and N2 are both integers greater than 1.

[0067] In a sixth aspect, an optical control apparatus is provided. The apparatus is configured to perform the method in the fifth aspect and possible designs thereof.

[0068] Specifically, the optical control apparatus can include units and / or modules configured to perform the method in any one of the implementation manners of the fifth aspect, for example, a transceiver module and / or a processing module.

[0069] Exemplarily, the transceiving module is configured to receive a first service optical signal of a first wavelength and a first dummy optical signal of a second wavelength, perform wavelength multiplexing on the first service optical signal and the first dummy optical signal, and transmit the first service optical signal and the first dummy optical signal to a first port of the first coupler, wherein the first dummy optical signal is used to fill idle channels in the first WSS except for a channel in which the first service optical signal is located, and the first wavelength is different from the second wavelength; the processing module is configured to perform wavelength multiplexing on the first service optical signal and the first dummy optical signal to obtain a first optical signal, and transmit the first optical signal to the optical fiber; the transceiving module is further configured to receive the first optical signal from the optical fiber, perform wavelength demultiplexing on the first optical signal to obtain the first service optical signal of the first wavelength and the first dummy optical signal of the second wavelength, and output the first service optical signal to a first port of the fourth WSS; and the transceiving module is further configured to receive the first service optical signal from the first port of the first branching filter and output the first service optical signal.

[0070] In an implementation manner, the optical control device is a network management device, or a communication module in the network management device, or a circuit or a chip responsible for a communication function in the network management device, or a function module or software capable of invoking and executing a program in the network management device.

[0071] For example, the transceiving module can be a transceiver or an input / output interface. The processing module can be at least one processor. Optionally, the transceiver can be a transceiving circuit. Optionally, the input / output interface can be an input / output circuit.

[0072] For another example, the transceiving module can be an input / output interface, an interface circuit, an output circuit, an input circuit, a pin, or a related circuit on the chip, the chip system, or the circuit. The processing module can be at least one processor, a processing circuit, or a logic circuit.

[0073] In a seventh aspect, a processor is provided, configured to execute the method provided in any of the aspects above. For the sending and obtaining / receiving operations of the processor, if no special description is given, or if it does not contradict with the actual role or inherent logic in the related description, it can be understood as the processor outputting and receiving, inputting, and the like, or as the sending and receiving operations performed by the radio frequency circuit and the antenna, which are not limited in the present application.

[0074] In an eighth aspect, a computer readable storage medium is provided. The computer readable storage medium stores program code for execution by an apparatus, and the program code includes instructions for executing the method provided in any of the implementation manners of the fifth aspect.

[0075] In a ninth aspect, a computer program product containing instructions is provided. When the computer program product is run on a computer, the computer is caused to execute the method provided in any of the implementation manners of the fifth aspect.

[0076] In a tenth aspect, a chip is provided, which includes one or more processors. The one or more processors can execute computer programs or instructions, when the computer programs or instructions are executed, causing the communication device to implement the method in any possible design or implementation manner of the fifth aspect.

[0077] Optionally, the chip further includes a communication interface or interface circuit. The processor reads the instructions stored on the memory through the communication interface, or the processor is configured to communicate with other devices or components through the interface circuit.

[0078] Optionally, the chip further includes a memory, and the memory stores computer programs or instructions. The processor is configured to execute the computer programs or instructions stored on the memory, and when the computer programs or instructions are executed, the processor is configured to execute the method provided in any implementation manner of the fifth aspect.

[0079] In an eleventh aspect, an optical communication system is provided, which includes the optical control device as described in the sixth aspect.

[0080] The beneficial effects brought by the second aspect to the eleventh aspect can refer to the description of the beneficial effects of the first aspect, which will not be repeated here. BRIEF DESCRIPTION OF DRAWINGS

[0081] FIGS. 1 and 2 show schematic diagrams of a conventional WDM system architecture.

[0082] FIG. 3 is a schematic diagram of a WDM system architecture applied to a C band.

[0083] FIG. 4 is a schematic diagram of a WDM system architecture applied to a C+L band.

[0084] FIG. 5 is a structural schematic diagram of a first OTM applied to a C+L band according to an embodiment of the present application.

[0085] FIG. 6 is a structural schematic diagram of a second OTM applied to a C+L band according to an embodiment of the present application.

[0086] FIG. 7 is a schematic diagram of an OTM system architecture according to an embodiment of the present application.

[0087] FIG. 8 is a schematic diagram of another OTM system architecture according to an embodiment of the present application.

[0088] FIG. 9 is a flow schematic diagram of an optical control method according to an embodiment of the present application.

[0089] FIG. 10 is a structural schematic diagram of an optical control device according to an embodiment of the present application.

[0090] FIG. 11 is a structural schematic diagram of another light control device according to an embodiment of the present application.

[0091] FIG. 12 is a schematic diagram of a WDM system architecture according to an embodiment of the present application. DETAILED DESCRIPTION

[0092] In order to facilitate understanding of the above-mentioned embodiments provided by the present application, the following points are explained:

[0093] 1) In the present application, the terms and / or descriptions of different embodiments are consistent and can be mutually referenced if there is no special description and logical conflict, and the technical features in different embodiments can be combined to form new embodiments according to their inherent logical relationship.

[0094] 2) In the present application, "at least one" means one or more, and "multiple" means two or more. "And / or" describes the association relationship of the associated objects, which means that there can be three kinds of relationships, for example, A and / or B, which can represent the following cases: A exists alone, A and B exist together, and B exists alone, where A and B can be singular or plural. In the literal description of the present application, the character " / " generally represents an "or" relationship between the front and rear associated objects. "At least one of the following" or similar expressions means any combination of these items, including any combination of single item or multiple items. For example, at least one of a, b and c can represent: a, or b, or c, or a and b, or a and c, or b and c, or a, b and c. Where a, b and c can be single or multiple.

[0095] 3) In the present application, "first", "second", and various number designations (for example, #1, #2, etc.) indicate differentiation for the sake of description, and are not intended to limit the scope of the embodiments of the present application. For example, different messages are distinguished, rather than being used to describe a specific order or sequence. It should be understood that the objects thus described can be interchanged as appropriate in order to describe solutions other than the embodiments of the present application.

[0096] 4) In the present application, "when", "in the case of", "if" and other descriptions all mean that the device will make corresponding processing under certain objective circumstances, and are not limited to time, and do not require the device to have a judgment action when implemented, nor does it mean that there are other limitations.

[0097] 5) In the present application, "protocol" can refer to a standard protocol in the communication field. "Predefined" can include predefinition. For example, protocol definition. "Preconfigured" can be achieved by pre-saving corresponding codes, tables or other means that can be used to indicate relevant information in the device, and the present application does not limit the implementation thereof.

[0098] 6) In this application, “communication” can also be described as “data transmission”, “information transmission”, “data processing” and the like. “Transmission” includes “sending” and “receiving”. “Transmission” can be described as “output”.

[0099] 7) In this application, “sending information to XX (device)” can be understood as that the destination of the information is the device. It can include directly or indirectly sending information to the device. “Receiving information from XX (device), or receiving information from XX (device)” can be understood as that the source of the information is the device, which can include directly or indirectly receiving information from the device. The information can be processed as necessary between the source and the destination of the information transmission, such as format change, etc., but the destination can understand the valid information from the source. Similar expressions in this application can be similarly understood, and will not be repeated here.

[0100] 8) In this application, words such as “exemplarily” and “for example” are used to represent examples, illustrations or descriptions. Any embodiment or design scheme described as “example” in this application should not be interpreted as more preferred or more advantageous than other embodiments or design schemes. Rather, the use of the word “example” is intended to present the concept in a specific way. In the embodiments of this application, “of”, “corresponding” and “corresponding” can be used interchangeably at times. It should be pointed out that when the difference is not emphasized, the meanings expressed are consistent.

[0101] 9) In this application, the same component or the same part can be represented by different reference numerals. In addition, the components in the drawings are not drawn to scale, and the size and the size of the components shown in the drawings are only exemplary and should not be understood as a limitation of the present application.

[0102] The technical solutions in the present application will be described below with reference to the accompanying drawings.

[0103] The technical solutions proposed in this application can be applied to optical transmission scenarios. For example, optical backbone transmission network, metropolitan optical network, optical access network, data center optical transmission and wireless service front / backhaul, etc. Specifically, the communication method and device provided in the embodiments of the present application can be applied to various optical communication systems, such as wavelength division multiplexing (WDM), all-optical network (AON), metropolitan area network (MAN), or optical transport network (OTN) system, etc.

[0104] Among them, as a system concept, WDM technology usually has 3 multiplexing modes, namely 1310nm and 1550nm wavelength division multiplexing, sparse wavelength division multiplexing (CWDM) and dense wavelength division multiplexing (DWDM). It should be understood that the WDM technology is a technology that at least two different wavelength optical carrier signals (carrying various information) are combined together by a multiplexer (also known as a combiner) at the sending end and coupled into the same optical fiber in the optical line for transmission. Correspondingly, at the receiving end, the demultiplexer (also known as a wave divider or demultiplexer) separates the optical carriers of various wavelengths, and then further processed by the optical receiver to recover the original signal.

[0105] Figure 1 is a schematic diagram of a WDM system architecture suitable for embodiments of the present application. In the networking shown in Figure 1, according to different functions, it can include but is not limited to the following three types of sites: optical terminal multiplexer OTM site (such as OTM site 101 and site 104 in Figure 1), optical line amplifier (OLA) site (such as OLA site 102 in Figure 1) and optical multiplexing site (such as reconfigurable optical add-drop multiplexer (ROADM) site 103 shown in Figure 1).

[0106] Among them, OTM site 101 and site 104 are the source node / origin and the destination node / endpoint of the service of the WDM network, i.e. the OTM site is located at both ends of the point-to-point transmission network, and there is only one line dimension (including transceiver). Specifically, the optical transponder unit (OTU) (such as OTU1, OTU2, …, OTUn shown in Figure 1) completes the conversion from electrical signal to optical signal, outputs optical signals of different wavelengths to WSS 112, and completes the combining of different wavelengths in WSS 112, and then realizes optical signal amplification through erbium-doped fiber amplifier (EDFA) 113, and then enters the transmission optical fiber from the facilities interface unit (FIU) 114.

[0107] It should be understood that the OTM site is mainly considered in the light signal-to-noise ratio, dispersion tolerance and other limiting factors, such as exceeding a certain distance (generally about 700KM), the need to increase the electrical relay OTM site solution. Considering that the OTM site has the ability to mass up and down waves, that is, the up and down port number of the OTM site can meet all the wavelength channels of the WDM system to access at the same time; the configuration of the OTM site is simple, easy to maintain, high integration, and at the same time requires a lower cost of optical devices, therefore, the OTM site is usually used for national trunk, primary trunk, international trunk, long-distance power network and other point-to-point single-chain transmission networks.

[0108] The OLA site 102 is a site that amplifies the received optical signal and can realize the relay amplification of the combined optical signal. In the WDM network, generally speaking, there are a plurality of OLA sites in succession, and the super-long distance transmission of the WDM service is realized through the optical relay of each site. Specifically, the FIU 121 receives the combined optical signal from the transmission fiber, and then the EDFA 122 realizes the amplification of the combined optical signal, and then the FIU 123 enters the transmission fiber.

[0109] The ROADM site 103 is an optical service implementation site that schedules and partially re-uploads the service direction. Specifically, the FIU 131 receives the optical signal from the transmission fiber, and then the EDFA 132 realizes the amplification of the optical signal, and then enters the WSS 133, and completes the wave separation processing of different wavelengths in the WSS 133, realizes the down wave of the service, and the down wave signal reaches each OTU via the WSS 135. The signal separated by the WSS 133 is subjected to service scheduling via the WSS 134, receives other service signals input from the WSS 136, realizes the up wave of the service in the WSS 134, and then enters the transmission fiber from the FIU 138 after the amplification of the WSS 134 and the EDFA 137. Optionally, there can be multiple ROADM sites between the OTM site 101 and the OTM site 104 to comprehensively realize the flexible scheduling of the service.

[0110] Finally, the service optical signal enters the rightmost OTM site 104, and specifically, the FIU 141 receives the optical signal from the transmission fiber, and then the EDFA 142 amplifies and the WSS 143 separates the wave to enter different OTUs for optical-electric conversion, that is, to complete the conversion from optical signal to electrical signal, to realize the reception of each electrical signal.

[0111] It should be noted that the above Figure 1 is an example illustrating the transceiving of service optical signals in the transmission direction of OTM station 101→OLA station 102→ROADM station 103→OTM station 104. Alternatively, in the WDM architecture, the service optical signals can also be transceived in the transmission direction of OTM station 104→ROADM station 103→OLA station 102→OTM station 101 (not shown in the figure), which is not limited in the present application.

[0112] It should be understood that the WDM system architecture shown in the above Figure 1 is only an example given for ease of description, and does not limit the scope of protection of the present application. For example, the number of WSSs 112 in OTM station 101 is not limited to one in the above Figure 1, and the OLA station 102 and the ROADM station 103 in the WDM network system can also have multiple ones.

[0113] Figure 2 is another WDM system architecture suitable for embodiments of the present application. In the networking shown in Figure 2, according to different functions, the following three types of stations can be included, but are not limited to: OTM stations (such as OTM stations 201 and 204 in Figure 2), OLA stations (such as OLA station 202 in Figure 2), and optical equalizers (OEQs) (such as OEQ station 203 shown in Figure 2).

[0114] The OEQ station 203 is a device used to adjust the propagation performance of optical signals in fiber communication, mainly used to compensate for signal distortion and attenuation, etc., to flatten the tilt characteristics of wavelength division multiplexed optical signals. The OEQ station 203 can include a detection unit, an optical attenuation unit, and an optical amplification unit. The detection unit detects the tilt characteristics based on the intensities of at least two optical signals in the wavelength division multiplexed optical signal, the optical attenuation unit is used to attenuate the intensity of the wavelength division multiplexed optical signal by a certain optical attenuation amount, and the optical amplification unit amplifies the attenuated wavelength division multiplexed optical signal according to the gain characteristics of the intensity of the attenuated wavelength division multiplexed optical signal.

[0115] Among them, the specific structure and function of OTM stations 201 and 204, and OLA station 202 can refer to the related description of the above Figure 1, which will not be repeated here.

[0116] Exemplarily, the service optical signals can be transmitted in the transmission direction of OTM station 201→OLA station 202→OEQ station 203→OTM station 204. For example, the OTM station 201 receives service optical signals of different wavelengths, completes the combining process, and sends the combined optical signals to the OLA station 202 through the transmission optical fiber. The OLA station 202 amplifies the combined optical signals and sends the amplified combined optical signals to the OEQ station 203 through the transmission optical fiber. The OEQ station 203 compensates the distortion and attenuation of the combined optical signals and sends them to the OTM station 204 through the transmission optical fiber. The OTM station 204 divides the combined optical signals and outputs service optical signals of different wavelengths. Alternatively, in the WDM architecture, the service optical signals can also be transmitted in the transmission direction of OTM station 204→OEQ station 203→OLA station 202→OTM station 201, which is not limited in the present application.

[0117] It should be understood that the WDM system architecture shown in FIG. 2 is only an example given for ease of description, and does not limit the scope of protection of the present application. For example, the OEQ 203 in the WDM network system can also have multiple OEQs.

[0118] Since the transmission attenuation loss of the transmission window corresponding to the C band and the L band is the smallest, the optical signals in the WDM system are usually transmitted in the C band and the L band. In the following, the WDM system architecture of the C band and the C+L band is described in conjunction with FIG. 3 and FIG. 4.

[0119] FIG. 3 is a schematic diagram of a WDM system architecture applied to the C band. As shown in FIG. 3, the architecture includes a sending end 301 (for example, a sending end OTM station) and a receiving end 302 (for example, a receiving end OTM station).

[0120] The OTM station generally adopts a combined architecture of arrayed waveguide grating (AWG) and comb filter (ITL) to realize the multiplexing and demultiplexing functions. The main feature of the AWG is the binding of the accessible signal wavelength and the port number, that is, after the design of the device is completed, a certain port of the AWG can only access the signal of a fixed wavelength, and other wavelengths are blocked at this port. Alternatively, in order to support the function of single-channel signal power adjustment, the AWG and an array of electrical variable optical attenuators (eVOA) are connected in series to form a variable optical power wavelength division multiplexer (VMUX). The VMUX is generally arranged at the transmitting end of the optical network, and is used to realize the power leveling of each signal channel to ensure that the transmission performance of each signal is equivalent. In this architecture, in order to improve the channel isolation of the AWG and prevent mutual interference between adjacent signal channels, the AWG is usually designed in the form of odd-even grouping.

[0121] The transmitting end 301 includes a VMUX 1, a VMUX 2, an ITL and an optical amplifier C. Exemplarily, the optical signals of the odd channels CH1 / 3… are accessed by the VMUX 1, and the signals of the even channels CH2 / 4… are accessed by the VMUX 2. The multiplexed optical signals output by the VMUX 1 and the VMUX 2 are transmitted to the ITL, and the mixing of the optical signals of the odd and even channels is completed through the ITL. After being amplified by the optical amplifier C, the mixed optical signals are input into the optical fiber for transmission.

[0122] The receiving end 302 includes an AWG 1, an AWG 2, an ITL and an optical amplifier C. Exemplarily, after the optical amplifier C receives the multiplexed optical signals from the optical fiber, the optical signals are amplified, and then demultiplexed through the ITL and the AWG. Specifically, the optical signals of the odd channels CH1 / 3… are output by the AWG 1, and the optical signals of the even channels CH2 / 4… are output by the AWG 2.

[0123] Alternatively, the WDM system architecture further includes at least one of an OEQ, an OLA or a ROADM, wherein the positional relationship between the OTM, the OEQ, the OLA or the ROADM can refer to the WDM system architecture shown in FIG. 1 or FIG. 2, which is not limited in the present application.

[0124] It should be understood that the stimulated raman scattering (SRS) effect of the optical fiber of the transmission system of the C+L band is 4 times that of the transmission system of the C band. The characteristic of the SRS effect is that the energy of the short-wavelength signal is transferred to the long-wavelength signal, and changes with the number of signal channels and the signal power value transmitted in the optical fiber, that is, the SRS effect dynamically changes.

[0125] In order to control the SRS effect of the optical fiber, ensure the stability and safety of the service signal, the transmission system of the C+L band can introduce a wide-spectrum DML signal for filling the idle channel, so that the system is always in a "full wave" state. The DML is a wide-spectrum amplified spontaneous emission (ASE) signal covering the full wavelength, and the wavelength signal to be filled is selected into the main light path through a combining and splitting device for filling.

[0126] However, when the WDM system architecture shown in the above Figure 3 is expanded to the C+L band, there may be serious defects, such as not supporting the access and control of the DML. This is because the wavelength of the accessible signal and the port number of the AWG are bound, and the OTM site composed of the conventional AWG cannot access the DML, so it cannot be used in the C+L system, and the use scenario is limited.

[0127] For the WDM system architecture, in order to support the access and control of the DML, and at the same time, prevent the conflict between the DML signal and the service optical signal, the access component of the DML needs to have the wavelength-level on-off control and attenuation adjustment capability. At present, the industry basically realizes this function through a wavelength selective switch WSS, such as superimposing a group of WSS on the conventional AWG combining scheme. This is because the WSS has the ability of wavelength on-off selection and attenuation adjustment of the access signal of any port, so it can perform wavelength-level trimming and power adjustment on the access false light to meet the application requirements of the system.

[0128] Figure 4 is a schematic diagram of a WDM system architecture applied to the C+L band. As shown in Figure 4, the architecture includes a sending end 401 (for example, a sending end OTM site) and a receiving end 402 (for example, a receiving end OTM site), and similar parts can refer to the related description of the above Figure 3.

[0129] In this architecture, the AWG is used as a low-cost and multi-port service signal access component, and the WSS is used as an access and control component of the DML.

[0130] The sending end 401 includes AWG 1, WSS 1 and amplifier C applied to the C band, and AWG 2, WSS 2 and amplifier L applied to the L band. Exemplarily, the service optical signals of different wavelengths of each channel CH1 / 2… are accessed by the AWG 1, the AWG 1 transmits the service optical signals of different wavelengths belonging to the C band range to the WSS 1, the WSS 1 performs wavelength combining processing, and the optical signals are amplified by the optical amplifier C and then output to the optical fiber for transmission; and the service optical signals of different wavelengths of each channel CH1 / 2… are accessed by the AWG 2, the AWG 2 transmits the service optical signals of different wavelengths belonging to the L band range to the WSS 2, the WSS 2 also accesses the DML for filling the idle channels, the WSS 2 performs wavelength combining processing on the service optical signals of different wavelengths and the DML, and the optical signals are amplified by the optical amplifier L and then output to the optical fiber for transmission.

[0131] The receiving end 402 includes the optical amplifier C, WSS 3 and AWG 3 applied to the C band, and the optical amplifier L, WSS 4 and AWG 4. Exemplarily, the optical amplifier C amplifies the combined optical signals received from the optical fiber, then the WSS 3 completes the wavelength splitting processing, and the service optical signals of different wavelengths belonging to the C band range are output by the AWG 3; and the optical amplifier L amplifies the combined optical signals received from the optical fiber, then the WSS 4 completes the wavelength splitting processing, and the service optical signals of different wavelengths belonging to the L band range are output by the AWG 4.

[0132] Optionally, the WDM system architecture further includes at least one of the OEQ, the OLA or the ROADM, wherein the positional relationship between the OTM, the OEQ, the OLA or the ROADM can refer to the WDM system architecture shown in FIG. 1 or FIG. 2, which is not limited in the present application.

[0133] It should be understood that both the WSS and the AWG have the functions of combining and splitting. In the WDM network architecture shown in FIG. 4, the service signals are accessed via the AWG, and the DML is accessed via the WSS. Therefore, it can be known that the WSS only uses part of the ports for accessing and controlling the service optical signals and the DML, and the other ports are not utilized. In addition, since the AWG is a combining and splitting device with a fixed channel spacing (the fixed passband bandwidth is determined by design), the WSS in the architecture cannot play the role of flexible and adjustable passband bandwidth. In addition, the port number of the current WSS in the industry is generally less than 30, and it is still difficult to improve the port number. Therefore, purely relying on the WSS to combine and split cannot meet the large quantity of uplink and downlink wave requirements of the OTM site, and has great defects in cost, integration and evolution.

[0134] To solve the above problems, the application provides an optical terminal multiplexer (OTM), for example, a first OTM or a second OTM. In the sending end, that is, the first WSS in the first OTM is used for receiving first service optical signals of different wavelengths and first dummy optical signals, and transmitting to the first coupler, and outputting to the optical fiber by the first coupler. Correspondingly, in the receiving end, that is, the first splitter in the second OTM is used for performing wave division processing on the received first optical signals to obtain first service optical signals and transmitting to the fourth WSS, and outputting the first service optical signals by the fourth WSS. The WSS in the OTM provided by the application is used as an access component of the service optical signals and the dummy optical signals, supports bandwidth adjustment and attenuation control of the ports, prevents conflict between the dummy optical signals and the service optical signals, and meanwhile introduces the coupler and / or the splitter, so that parallel work of multiple WSSs can be supported, the demand of OTM for large quantity of uplink and downlink waves can be met, and the transmission performance of the system is improved.

[0135] Next, the first OTM or the second OTM provided by the embodiment of the application will be described in detail in combination with FIG. 5 and FIG. 6. It should be understood that the first OTM or the second OTM is applicable to C-band, L-band or C+L-band.

[0136] FIG. 5 is a structural schematic diagram of the first OTM provided by the embodiment of the application. As shown in FIG. 5, the first OTM 500 includes a first WSS 510 and a first coupler 520. Among them, the port #1 of the first WSS 510 is used for receiving first service optical signals of a first wavelength, the port #2 of the first WSS 510 is used for receiving first dummy optical signals of a second wavelength, then the first WSS 510 performs wave combining processing on the first service optical signals and the first dummy optical signals, and transmits to the port #1 of the first coupler 520; the first coupler 520 is used for transmitting the first optical signals obtained by performing wave combining processing on the first service optical signals and the first dummy optical signals to an optical fiber 530.

[0137] Exemplarily, the first OTM supports M1*N1 optical signal access, M1 represents the number of input ports of the first WSS, N1 represents the number of input ports of the first coupler, and M1 and N1 are both integers greater than 1.

[0138] FIG. 6 is a structural schematic diagram of the second OTM provided by the embodiment of the application. As shown in FIG. 6, the second OTM 600 includes a fourth WSS 620 and a first splitter 610. Among them, the port #1 of the first splitter 610 is used for receiving first optical signals from the optical fiber 530, then performing wave division processing on the first optical signals to obtain first service optical signals of a first wavelength and first dummy optical signals of a second wavelength, and outputting the first service optical signals to the port #1 of the fourth WSS 620; the fourth WSS 620 is used for receiving the first service optical signals from the port #1 of the first splitter 610, and outputting the first service optical signals.

[0139] Exemplarily, the second OTM supports M2*N2 optical signal outputs, where M2 represents the number of output ports of the fourth WSS, and N2 represents the number of output ports of the first splitter, and both M2 and N2 are integers greater than 1.

[0140] It should be understood that the first dummy optical signal described in the above Fig. 5 or Fig. 6 is used to fill the idle channels in the first WSS except the channel where the first service optical signal is located. Here, the first wavelength and the second wavelength are different, for example, the first wavelength belongs to the C band or the L band, and the second wavelength belongs to the C+L band.

[0141] It should be noted that the above Fig. 5 and Fig. 6 are only examples given for the convenience of understanding, and other schemes are not excluded. Alternatively, the number of the first WSS and the first coupler in the first OTM is not limited by the present application, and the number of the first splitter and the fourth WSS in the second OTM is also not limited by the present application.

[0142] Next, the OTM system architecture provided by the embodiments of the present application will be described in detail in combination with Fig. 7 and Fig. 8. It should be understood that the OTM system architecture is applicable to the C band, the L band, or the C+L band.

[0143] Fig. 7 is a schematic diagram of an OTM system architecture applied to the C+L band according to an embodiment of the present application. As shown in Fig. 7, the OTM system includes a first OTM 701 and a second OTM 702, and the first OTM 701 and the second OTM 702 are connected through an optical fiber 706, or in other words, the first OTM 701 outputs the first optical signal obtained by the combining processing to the second OTM 702 through the optical fiber 706.

[0144] Exemplarily, the first OTM 701 includes a WSS 1 703 (i.e., a first WSS) and a coupler 704 (i.e., a first coupler). Here, port #1 of the coupler 704 is connected with a VOA #1 (i.e., a first VOA), the VOA #1 is connected with the WSS 1 703, and the VOA #1 is used to transmit the first optical signal obtained by the WSS 1 703 to port #1 of the coupler. For example, port #1 of the WSS 1 703 receives a first service optical signal of a first wavelength from a channel (CH), port #2 of the WSS 1 703 receives a first dummy optical signal of a second wavelength, and the WSS 1 703 combines the first service optical signal and the first dummy optical signal to obtain the first optical signal, and then transmits the first optical signal to port #1 of the coupler 704 through the VOA #1, and the coupler 704 outputs the first optical signal to the optical fiber 706.

[0145] Optionally, the first OTM 701 further comprises a WSS 2 705 (i.e., a second WSS), port #2 of the coupler 704 is connected with a VOA #2 (i.e., a second VOA), the VOA #2 is connected with the WSS 2 705, and the VOA #2 is used for transmitting the second optical signal obtained by the WSS 2 705 from the combining of the second service optical signal to port #2 of the coupler.

[0146] In one example, port #1 of the WSS 2 705 is used for receiving the second service optical signal of the third wavelength, and the second service optical signal is transmitted to port #2 of the coupler 704 through the VOA #2; the coupler 704 is further used for combining the first optical signal and the second service optical signal, and outputting to the optical fiber 706.

[0147] In another example, port #1 of the WSS 2 705 is used for receiving the second service optical signal of the third wavelength, port #2 of the WSS 2 705 is used for receiving the second dummy optical signal of the second wavelength, then the WSS 2 705 combines the second service optical signal and the second dummy optical signal to obtain the second optical signal, and the second optical signal is transmitted to port #2 of the coupler 704 through the VOA #2; the coupler 704 is further used for combining the first optical signal and the second optical signal, and outputting to the optical fiber 706.

[0148] Optionally, the coupler 704 further comprises a VOA #3 (i.e., a third VOA), and the VOA #3 is connected with port #3 of the coupler 704. For example, when port #3 of the coupler 704 is not connected with a WSS but is suspended, the VOA #3 is used for blocking external non-signal interference sources. That is, signals of other wavelengths cannot be transmitted to port #3 of the coupler 704 through the VOA #3.

[0149] Exemplarily, the second OTM 702 comprises a splitter 707 (i.e., a first splitter) and a WSS 4 708 (i.e., a fourth WSS). For example, port #1 of the splitter 707 receives the first optical signal from the optical fiber 706, then splits the first optical signal to obtain the first service optical signal of the first wavelength and the first dummy optical signal of the second wavelength, and outputs the first service optical signal to port #1 of the WSS 4 708, and port #1 of the WSS 4 708 outputs the first service optical signal.

[0150] Optionally, the second OTM 702 further comprises a WSS 5 709 (i.e., a fifth WSS).

[0151] In one example, the splitter 707 is further used for receiving the second service optical signal of the third wavelength from the optical fiber 706, and outputting to port #1 of the WSS 5 709; the WSS 5 709 is used for receiving the second service optical signal from port #2 of the splitter 707, and outputting the second service optical signal.

[0152] In another example, the splitter 707 is further configured to receive the second optical signal from the optical fiber 706, then split the second optical signal to obtain a second service optical signal of the third wavelength and a second dummy optical signal of the second wavelength, and output the second service optical signal to port #1 of the WSS 5 709; the WSS 5 709 is configured to receive the second service optical signal from port #2 of the splitter 707, and output the second service optical signal.

[0153] It should be understood that the above-mentioned second dummy optical signal is used to fill the idle channels in the first WSS except the channel where the first service optical signal is located, and the idle channels in the second WSS except the channel where the second service optical signal is located. Wherein, the first wavelength, the third wavelength and the second wavelength are different, for example, the first wavelength belongs to the C band or the L band, the third wavelength belongs to the C band or the L band, and the second wavelength belongs to the C+L band.

[0154] FIG. 8 is a schematic diagram of another OTM system architecture applied to the C+L band according to an embodiment of the present application. As shown in FIG. 8, the OTM system includes a first OTM 801 and a second OTM 802, and the first OTM 801 can output a first optical signal obtained by combining a first service optical signal of a first wavelength and a first dummy optical signal of a second wavelength to the second OTM 802 through an optical fiber 809. Correspondingly, the second OTM 802 can receive the first optical signal through the optical fiber 809.

[0155] Exemplarily, the first OTM 801 includes an integrated WSS 1 803 (i.e., a first WSS) and a coupler #a 805 (i.e., a first coupler). For example, port #1 of the integrated WSS 1 803 receives a first service optical signal of a first wavelength, port #2 of the integrated WSS 1 803 receives a first dummy optical signal of a second wavelength, and the first service optical signal and the first dummy optical signal are combined to obtain a first optical signal, which is then transmitted to port #1 of the coupler #a 805, and the coupler #a 805 outputs the first optical signal to the optical fiber 809.

[0156] It should be understood that the integrated WSS refers to a WSS supporting the C band, the L band, or the C+L band.

[0157] Optionally, the first OTM 801 further includes a coupler #b 806 (i.e., a second coupler), and the integrated WSS 1 803 is further configured to receive a fourth service optical signal of a fourth wavelength, then combine the fourth service optical signal and the first dummy optical signal, and output to port #1 of the coupler #a 805 or port #1 of the coupler #b 806.

[0158] For example, when the coupler #a 805 corresponds to the C band and the coupler #b 806 corresponds to the L band, the first wavelength belongs to the C band, that is, the port #1 of the integrated WSS 1 receives the first service optical signal from OUT-C. At this time, the coupler #a 805 is also used to output the optical signal obtained by combining the C band part of the first service optical signal and the first dummy optical signal to the optical fiber 809; if the fourth wavelength belongs to the L band, the coupler #b 806 is used to output the optical signal obtained by combining the L band part of the fourth service optical signal and the first dummy optical signal to the optical fiber 809; if the fourth wavelength belongs to the C band, the coupler #a 805 is also used to output the optical signal obtained by combining the C band part of the fourth service optical signal and the first dummy optical signal to the optical fiber 809.

[0159] For example, when the coupler #a 805 corresponds to the C band and the coupler #b 806 corresponds to the L band, the first wavelength belongs to the C band, that is, the port #1 of the integrated WSS 1 receives the first service optical signal from OUT-C. At this time, the coupler #a 805 is also used to output the optical signal obtained by combining the C band part of the first service optical signal and the first dummy optical signal to the optical fiber 809; if the fourth wavelength belongs to the L band, the coupler #b 806 is used to output the optical signal obtained by combining the L band part of the fourth service optical signal and the first dummy optical signal to the optical fiber 809; if the fourth wavelength belongs to the C band, the coupler #a 805 is also used to output the optical signal obtained by combining the C band part of the fourth service optical signal and the first dummy optical signal to the optical fiber 809.

[0160] For example, when the coupler #a 805 corresponds to the C band and the coupler #b 806 corresponds to the L band, the first wavelength belongs to the C band, that is, the port #1 of the integrated WSS 1 receives the first service optical signal from OUT-C. At this time, the coupler #a 805 is also used to output the optical signal obtained by combining the C band part of the first service optical signal and the first dummy optical signal to the optical fiber 809; if the fourth wavelength belongs to the L band, the coupler #b 806 is used to output the optical signal obtained by combining the L band part of the fourth service optical signal and the first dummy optical signal to the optical fiber 809; if the fourth wavelength belongs to the C band, the coupler #a 805 is also used to output the optical signal obtained by combining the C band part of the fourth service optical signal and the first dummy optical signal to the optical fiber 809.

[0161] For example, when coupler #a 805 corresponds to the L band and coupler #b 806 corresponds to the L band, the first wavelength belongs to the L band, i.e., port #1 of the integrated WSS 1 receives the first service optical signal from OUT-L. At this time, the coupler #a 805 is also used to output the optical signal obtained by combining the L band part of the first service optical signal and the first dummy optical signal to the optical fiber 809; if the fourth wavelength belongs to the L band, the coupler #a 805 is used to output the optical signal obtained by combining the L band part of the fourth service optical signal and the first dummy optical signal to the optical fiber 809.

[0162] Optionally, the first OTM 801 further includes an integrated WSS 2 804 (i.e., a third WSS). Assuming that the coupler #a 805 corresponds to the C band and the coupler #b 806 corresponds to the L band, the first wavelength belongs to the C band, i.e., port #1 of the integrated WSS 1 receives the first service optical signal from OUT-C.

[0163] In one example, the integrated WSS 2 804 is used to receive a fifth service optical signal of a fifth wavelength and output to port #2 of the coupler #a 805 or port #2 of the coupler #b 806; if the fifth wavelength belongs to the C band, port #1 of the integrated WSS 2 receives the fifth service optical signal from OUT-C. The coupler #a 805 is also used to output the optical signal obtained by combining the C band part of the fifth service optical signal and the first service optical signal and the first dummy optical signal to the optical fiber 809; if the fifth wavelength belongs to the L band, the coupler #b 806 is used to output the fifth service optical signal to the optical fiber 809.

[0164] In another example, port #1 of the integrated WSS 2 804 is used to receive a fifth service optical signal of a fifth wavelength, and port #2 of the integrated WSS 2 804 is used to receive a third dummy optical signal of a second wavelength, and then the fifth service optical signal and the third dummy optical signal are combined and output to port #2 of the coupler #a 805 or port #2 of the coupler #b 806; if the fifth wavelength belongs to the C band, the coupler #a 805 is also used to output the optical signal obtained by combining the C band part of the fifth service optical signal and the third dummy optical signal to the optical fiber 809; if the fifth wavelength belongs to the L band, the coupler #b 806 is used to output the optical signal obtained by combining the L band part of the fifth service optical signal and the third dummy optical signal to the optical fiber 809.

[0165] Optionally, assuming that the coupler #a 805 corresponds to the L band and the coupler #b 806 corresponds to the C band, the first wavelength belongs to the L band, that is, the port #1 of the integrated WSS 1 receives the first service optical signal from OUT-L; or, when the coupler #a 805 and the coupler #b 806 both correspond to the C band or the L band, the specific implementation manner can refer to the related description above, and details are not described herein for the sake of brevity.

[0166] Exemplarily, the first OTM in the above-described FIG. 7 or FIG. 8 supports M1*N1 optical signal access, M1 represents the number of input ports of the first WSS, N1 represents the number of input ports of the first coupler, and M1 and N1 are both integers greater than 1. The second OTM supports M2*N2 optical signal output, M2 represents the number of output ports of the fourth WSS, N2 represents the number of output ports of the first splitter, and M2 and N2 are both integers greater than 1.

[0167] It should be understood that the above-described third dummy optical signal is used to fill the idle channels in the first WSS except the channels where the first service optical signal and the fourth service optical signal are located, and the channels in the third WSS except the channel where the fifth service optical signal is located. Among them, the first wavelength, the second wavelength, the fourth wavelength and the fifth wavelength are different, for example, the first wavelength belongs to the C band or the L band, the fourth wavelength belongs to the C band or the L band, the fifth wavelength belongs to the C band or the L band, and the second wavelength belongs to the C+L band.

[0168] It should be noted that the above-described FIG. 7 or FIG. 8 is only an example given for the sake of understanding, and other schemes are not excluded. Optionally, the number of WSSs and couplers in the first OTM is not limited by the present application, and the number of splitters and WSSs in the second OTM is also not limited by the present application. Optionally, the first OTM and the second OTM in the above-described FIG. 7 or FIG. 8 can be decoupled, that is, the first OTM and the second OTM can be independently implemented as an OTM sending end and an OTM receiving end, respectively, and the present application does not limit this.

[0169] Next, the optical control method provided by the embodiments of the present application will be described in detail in combination with the drawings, which is applied to an optical terminal multiplexer (OTM) system or a WDM system. It should be understood that the embodiments of the present application can be applied to a communication scenario in which a sending device (for example, the first OTM) and a receiving device (for example, the second OTM) communicate. The present application is mainly applied to a C+L optical transmission system, especially a site that needs large-scale uplink and downlink, such as an OTM site, a CD site, etc.

[0170] It should be noted that the execution subject of the embodiments of the present application can be a network management device (which can be referred to as a network management device) or other processing devices, and the present application is not limited. In the present application, without special description, the network management device can be the network management device itself, or can refer to the communication module in the network management device, or the component responsible for the communication function in the network management device (for example, a processor, a circuit, a chip or a chip system, or it can also refer to the function module or software in the network management device capable of calling and executing programs. For the convenience of description, the following embodiments take the network management device as the execution subject for description. It should be understood that when the network management device is other nodes, chips, circuits or entities, the corresponding specific implementation manners are similar, and the present application will not be described here.

[0171] FIG. 9 is a flow diagram of an optical control method provided by an embodiment of the present application, which is applied to an OTM system including a first OTM and a second OTM, the first OTM including a first WSS and a first coupler, and the second OTM including a fourth WSS and a first splitter. As shown in FIG. 9, the method 900 includes the following steps.

[0172] S910, the network management device controls the first WSS to receive a first service optical signal of a first wavelength and a first dummy optical signal of a second wavelength, performs wavelength combining processing on the first service optical signal and the first dummy optical signal, and transmits the first service optical signal and the first dummy optical signal to a first port of the first coupler.

[0173] The first dummy optical signal is used to fill the idle wave channels of the first WSS except the wave channel of the first service optical signal, and the first wavelength and the second wavelength are different.

[0174] S920, the network management device controls the first coupler to perform wavelength combining processing on the first service optical signal and the first dummy optical signal, and transmits the obtained first optical signal to an optical fiber.

[0175] S930, the network management device controls the first splitter to receive the first optical signal from the optical fiber, performs wavelength splitting processing on the first optical signal to obtain the first service optical signal of the first wavelength and the first dummy optical signal of the second wavelength, and outputs the first service optical signal to a first port of the fourth WSS.

[0176] S940, the network management device controls the fourth WSS to receive the first service optical signal from the first port of the first splitter, and outputs the first service optical signal.

[0177] Optionally, the first OTM further includes a second WSS.

[0178] For example, the network management device controls the second WSS to receive a second service optical signal of a third wavelength, and transmits the second service optical signal to a second port of the first coupler; controls the first coupler to perform wavelength combining processing on the first optical signal and the second service optical signal, and outputs the first optical signal and the second service optical signal to an optical fiber.

[0179] For another example, the network management device controls the second WSS to receive a second service optical signal of a third wavelength and a second dummy optical signal of a second wavelength, to perform wavelength combining on the second service optical signal and the second dummy optical signal, and to transmit to the second port of the first coupler. The second dummy optical signal is used to fill idle channels in the first WSS except the channel of the first service optical signal and in the second WSS except the channel of the second service optical signal, and the first wavelength, the third wavelength and the second wavelength are different. The network management device controls the first coupler to perform wavelength combining on the first optical signal and the second optical signal and to output to the optical fiber, and the second optical signal is obtained by performing wavelength combining on the second service optical signal and the second dummy optical signal.

[0180] Optionally, the first OTM further comprises a first VOA and a second VOA, wherein the first VOA is connected with the first port of the first coupler, and the second VOA is connected with the second port of the first coupler. For example, the network management device controls the first VOA to make the first optical signal pass through the first port of the first coupler, and controls the second VOA to make the second optical signal pass through the second port of the first coupler.

[0181] Optionally, the first OTM further comprises a third VOA. For example, the network management device controls the third VOA to be connected with the third port of the first coupler. The method further comprises: when the third port of the first coupler is not connected with a WSS, the network management device controls the third VOA to block an external non-signal interference source.

[0182] Optionally, the first OTM further comprises a second coupler.

[0183] For example, the network management device controls the first WSS to further receive a fourth service optical signal of a fourth wavelength, to perform wavelength combining on the fourth service optical signal and the first dummy optical signal, and to output to the first port of the first coupler or the first port of the second coupler. Optionally, when the first coupler corresponds to a C band and the second coupler corresponds to an L band, the first wavelength belongs to the C band. The network management device controls the first coupler to further output an optical signal obtained by performing wavelength combining on the C band part of the first service optical signal and the first dummy optical signal to the optical fiber; if the fourth wavelength belongs to the L band, controls the second coupler to output an optical signal obtained by performing wavelength combining on the L band part of the fourth service optical signal and the first dummy optical signal to the optical fiber; and if the fourth wavelength belongs to the C band, controls the first coupler to further output an optical signal obtained by performing wavelength combining on the C band part of the fourth service optical signal and the first dummy optical signal to the optical fiber.

[0184] Optionally, the first OTM further comprises a third WSS.

[0185] For example, the network management device controls the third WSS to receive a fifth service optical signal of a fifth wavelength, and output to the second port of the first coupler or the second port of the second coupler; if the fifth wavelength belongs to the C band, the first coupler is further configured to output an optical signal obtained by combining the fifth service optical signal, the first service optical signal and the C band part of the first dummy optical signal to the optical fiber; if the fifth wavelength belongs to the L band, the second coupler is configured to output the fifth service optical signal to the optical fiber.

[0186] For example, the network management device controls the third WSS to receive a fifth service optical signal of a fifth wavelength, and output to the second port of the first coupler or the second port of the second coupler; if the fifth wavelength belongs to the C band, the first coupler is further configured to output an optical signal obtained by combining the fifth service optical signal, the first service optical signal and the C band part of the first dummy optical signal to the optical fiber; if the fifth wavelength belongs to the L band, the second coupler is configured to output the fifth service optical signal to the optical fiber.

[0187] Optionally, the second OTM further comprises a fifth WSS.

[0188] For example, the network management device controls the first splitter to further receive a second service optical signal of a third wavelength from the optical fiber, and output to the first port of the fifth WSS; controls the fifth WSS to receive the second service optical signal from the second port of the first splitter, and output the second service optical signal.

[0189] For example, the network management device controls the first splitter to further receive a second service optical signal of a third wavelength from the optical fiber, and output to the first port of the fifth WSS; controls the fifth WSS to receive the second service optical signal from the second port of the first splitter, and output the second service optical signal.

[0190] Optionally, the second OTM further comprises a second splitter. When the first splitter corresponds to the C band and the second splitter corresponds to the L band, the first wavelength belongs to the C band. Optionally, if the fourth wavelength belongs to the L band, the network management device controls the second splitter to receive the optical signal from the optical fiber, performs wavelength division processing on the optical signal to obtain the fourth service optical signal of the fourth wavelength and the L band part of the first dummy optical signal, and outputs the fourth service optical signal to the second port of the fourth WSS; if the fourth wavelength belongs to the C band, the network management device controls the first splitter to further receive the optical signal from the optical fiber, performs wavelength division processing on the optical signal to obtain the fourth service optical signal and the C band part of the first dummy optical signal, and outputs the fourth service optical signal to the first port of the fourth WSS.

[0191] Optionally, the second OTM further comprises a sixth WSS.

[0192] For example, if the fifth wavelength belongs to the C band, the network management device controls the first splitter to further receive the optical signal from the optical fiber, performs wavelength division processing on the optical signal to obtain the fifth service optical signal and the C band part of the third dummy optical signal, and outputs the fifth service optical signal to the first port of the sixth WSS; if the fifth wavelength belongs to the L band, the network management device controls the second splitter to receive the optical signal from the optical fiber, performs wavelength division processing on the optical signal to obtain the fifth service optical signal of the fifth wavelength and the L band part of the third dummy optical signal of the second wavelength, and outputs the fifth service optical signal to the second port of the sixth WSS.

[0193] For example, the first OTM supports M1*N1 optical signal access, M1 represents the number of input ports of the first WSS, N1 represents the number of input ports of the first coupler, and M1 and N1 are both integers greater than 1. The second OTM supports M2*N2 optical signal output, M2 represents the number of output ports of the fourth WSS, N2 represents the number of output ports of the first splitter, and M2 and N2 are both integers greater than 1.

[0194] For example, the first wavelength, the third wavelength, the fourth wavelength, and the fifth wavelength all belong to the C band or the L band, and the second wavelength belongs to the C+L band.

[0195] Based on the above scheme, the first OTM or the second OTM provided by the present application supports the access and control of the dummy optical signal, meets the basic requirement of stable work of the service signal of the C+L system. At the same time, by using the first coupler or the first splitter, the parallel work of multiple WSSs can be supported, the number of signal access ports is doubled, the capacity of large number of uplink and downlink waves is improved, and the system transmission performance is improved. Compared with the existing AWG architecture, the technical scheme of the present application uses WSS to access the service signal, so it is no longer limited by the fixed shortcomings of the AWG channel bandwidth. The WSS can flexibly configure the channel bandwidth of the access signal, can support the simultaneous access of different wave rate signals, has the ability of generational evolution, and has better integration and configuration cost.

[0196] It should be understood that in some of the above embodiments, the devices in the existing network architecture are mainly exemplarily described (such as OTM stations or OTM devices), and the specific forms of the devices are not limited in the embodiments of the present application. For example, devices having the same functions in the future are also applicable to the present application.

[0197] The above describes the light control method provided by the embodiments of the present application in detail. The above light control method is mainly introduced from the perspective of the interaction between the first OTM and the second OTM. It can be understood that the first OTM and the second OTM contain the corresponding hardware structure and / or software module for executing each function in order to realize the above functions. The device-side embodiments of the present application, including the light control device and the WDM system architecture, will be described in detail below in combination with FIG. 10 to FIG. 12. It should be understood that the description of the device embodiments corresponds to the description of the method embodiments, and therefore, the parts not described in detail can be referred to the foregoing method embodiments.

[0198] FIG. 10 is a schematic block diagram of a light control device 1000 provided by an embodiment of the present application. As shown in FIG. 10, the device 1000 includes a processing module 1010 and a communication module 1020. The device 1000 can be a network management device or a sending device (such as a first OTM) or a receiving device (such as a second OTM), or can be a device applied to the network management device or the sending device or the receiving device, or used in matching with the network management device or the sending device or the receiving device, and capable of realizing the method executed by the network management device or the sending device or the receiving device, such as a chip, a chip system or a circuit.

[0199] The communication module 1020 can also be referred to as a transceiver module, a transceiver, a transceiver, a transceiver unit or a transceiver device, etc. The processing module 1010 can also be referred to as a processor, a processing board, a processing unit or a processing device, etc. Optionally, the communication module 1020 is used to execute the sending operation and the receiving operation of the network management device, the sending device and the receiving device in the above method, and the devices in the communication module 1020 for realizing the receiving function can be regarded as a receiving unit, and the devices in the communication module 1020 for realizing the sending function can be regarded as a sending unit, that is, the communication module 1020 includes a receiving unit and a sending unit.

[0200] Optionally, the device 1000 can further include a storage module 1030 for storing device program codes and / or data.

[0201] In an example, when the device 1000 is applied to the network management device, the processing module 1010 can be used to realize the processing function of the network management device in the above embodiments, and the communication module 1020 can be used to realize the transceiving function of the network management device in the above embodiments.

[0202] For example, when the apparatus 1000 is a communication module in a network management device, the function of the processing module 1010 can be implemented by one or more processors. Specifically, the processor can include a Modem chip, or a System on Chip (SoC) chip or a SIP chip containing a Modem core. The function of the communication module 1020 can be implemented by a transceiver circuit.

[0203] For another example, when the apparatus 1000 is a circuit or chip responsible for communication function in a network management device, the function of the processing module 1010 can be implemented by the circuit system including one or more processors or processor cores in the above-mentioned chip. The function of the communication module 1020 can be implemented by the interface circuit or data transceiver circuit on the above-mentioned chip.

[0204] Exemplarily, the communication module 1020 is configured to receive a first service optical signal of a first wavelength and a first dummy optical signal of a second wavelength, perform wavelength multiplexing processing on the first service optical signal and the first dummy optical signal, and transmit the first service optical signal and the first dummy optical signal to a first port of the first coupler, wherein the first dummy optical signal is used to fill the idle channels in the first WSS except the channel of the first service optical signal, and the first wavelength and the second wavelength are different; the processing module 1010 is configured to perform wavelength multiplexing processing on the first service optical signal and the first dummy optical signal, and transmit the obtained first optical signal to an optical fiber; the communication module 1020 is further configured to receive the first optical signal from the optical fiber, perform wavelength demultiplexing processing on the first optical signal to obtain the first service optical signal of the first wavelength and the first dummy optical signal of the second wavelength, and output the first service optical signal to a first port of the fourth WSS; and the communication module 1020 is further configured to receive the first service optical signal from the first port of the first branching filter, and output the first service optical signal.

[0205] In addition, it needs to be noted that the aforementioned communication module and / or processing module can be implemented by a virtual module, for example, the processing module can be implemented by a software function unit or a virtual apparatus, and the communication module can be implemented by a software function or a virtual apparatus. Alternatively, the processing module or the communication module can also be implemented by a physical apparatus, for example, if the apparatus is implemented by a chip / circuit (such as an integrated circuit or a logic circuit, etc.). The communication module can be an input / output circuit and / or a communication interface, which performs an input operation (corresponding to the aforementioned receiving operation) and an output operation (corresponding to the aforementioned sending operation); and the processing module is an integrated processor or a microprocessor or a circuit (such as an integrated circuit or a logic circuit, etc.).

[0206] The division of modules in the present application is illustrative, and is only a logical function division. Actual implementation can have another division manner. In addition, each function module in each example in the present application can be integrated in one processor, or can be a separate physical existence, or two or more modules can be integrated in one module. The integrated module can be realized in the form of hardware or in the form of a software function module.

[0207] In one example, the function units in any of the above apparatuses can be one or more integrated circuits configured to implement the above methods, such as one or more application specific integrated circuits (ASICs), or one or more central processing units (CPUs), one or more microcontroller units (MCUs), one or more digital signal processors (DSPs), or one or more field programmable gate arrays (FPGAs), or a combination of at least two of these integrated circuit forms.

[0208] In one example, the storage module 1030 can include a random access memory, a flash memory, a read only memory, a programmable read only memory, an electrically erasable programmable memory, a register, and / or the like.

[0209] FIG. 11 is a schematic block diagram of another light control apparatus 1100 provided by an embodiment of the present application. Optionally, the apparatus 1100 can be a chip or a chip system. Optionally, in the present application, a chip system can be composed of a chip, or can include a chip and other discrete devices.

[0210] As shown in FIG. 11, the apparatus 1100 can be used to implement the functions of any of the apparatuses (such as a network management device, a sending device, or a receiving device) in the communication systems described in the foregoing examples. The apparatus 1100 can include at least one processor 1110. Optionally, the processor 1110 is coupled with a memory. The memory can be located in the apparatus, or the memory can be integrated with the processor, or the memory can be located outside the apparatus. For example, the apparatus 1100 can further include at least one memory 1120. The memory 1120 stores necessary computer programs, computer programs or instructions, and / or data for implementing any of the above examples. The processor 1110 can execute the computer programs stored in the memory 1120 to complete the methods in any of the above examples.

[0211] The apparatus 1100 can further include a communication interface 1130, through which the apparatus 1100 can exchange information with other devices. For example, the communication interface 1130 can be a transceiver, a circuit, a bus, a module, a pin, or another type of communication interface. When the apparatus 1100 is a chip or a circuit, the communication interface 1130 in the apparatus 1100 can also be an input / output circuit, which can input (or receive) information and output (or send) information. The processor 1110 can be an integrated processor, a microprocessor, an integrated circuit, or a logic circuit, etc. The processor can determine output information according to input information.

[0212] In an example, when the apparatus 1100 is applied to a network management device, the processor 1110 can be configured to implement the processing functions of the network management device in the above embodiments, and the communication interface 1130 can be configured to implement the transceiving functions of the network management device in the above embodiments.

[0213] In an example, when the apparatus 1100 is applied to a sending device (e.g., a first OTM), the processor 1110 can be configured to implement the processing functions of the sending device in the above embodiments, and the communication interface 1130 can be configured to implement the transceiving functions of the sending device in the above embodiments.

[0214] In an example, when the apparatus 1100 is applied to a receiving device (e.g., a second OTM), the processor 1110 can be configured to implement the processing functions of the receiving device in the above embodiments, and the communication interface 1130 can be configured to implement the transceiving functions of the receiving device in the above embodiments.

[0215] The coupling in the present application is an indirect coupling or a communication connection between apparatuses, units, or modules, which can be electrical, mechanical, or other forms, and is used for information exchange between apparatuses, units, or modules. The processor 1110 can operate in cooperation with the memory 1120 and the communication interface 1130. The specific connection medium between the processor 1110, the memory 1120, and the communication interface 1130 is not limited in the present application.

[0216] Optionally, as shown in FIG. 11, the processor 1110, the memory 1120, and the communication interface 1130 are connected to each other through a bus 1140. Optionally, the bus can include an address bus, a data bus, a control bus, and the like. In addition, for ease of representation, one bus 1040 is shown in FIG. 11, but it does not mean that there is only one bus or only one type of bus.

[0217] FIG. 12 is a schematic diagram of a WDM system architecture according to an embodiment of the present application. As shown in FIG. 12, the WDM system 1200 includes a first OTM 1201, a second OTM 1202 and an OLA 1203. For example, the first OTM 1201 sends an optical signal #1 to the OLA 1203 through an optical fiber, the OLA 1203 amplifies the optical signal #1 and then transmits the amplified optical signal to the second OTM 1202 through an optical fiber.

[0218] For the components of the first OTM 1201 and the second OTM 1202 and their functions, reference can be made to the related descriptions of FIGS. 5 to 8 above, and thus the descriptions are not repeated here for brevity.

[0219] It should be understood that the processor mentioned in the embodiments of the present application can be a device or a part of circuit for processing function in the following devices: a central processing unit (CPU), other general-purpose processors, a digital signal processor (DSP), an application specific integrated circuit (ASIC), a field programmable gate array (FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. The general-purpose processor can be a microprocessor or the processor can also be any conventional processor.

[0220] It should also be understood that the memory referred to in the embodiments described herein can be volatile memory and / or non-volatile memory. The non-volatile memory can be read-only memory (ROM), programmable ROM (PROM), erasable PROM (EPROM), electrically EPROM (EEPROM), or flash memory, for example. The volatile memory can be random access memory (RAM), for example. The RAM can be used as external cache memory, for example. By way of example and not limitation, RAM includes the following types: static RAM (SRAM), dynamic RAM (DRAM), synchronous DRAM (SDRAM), double data rate SDRAM (DDR SDRAM), enhanced SDRAM (ESDRAM), synchlink DRAM (SLDRAM), and direct rambus RAM (DR RAM).

[0221] It should be noted that when the processor is a general processor, a DSP, an ASIC, a FPGA or other programmable logic device, a discrete gate or transistor logic device, a discrete hardware component, the memory (storage module) can be integrated in the processor.

[0222] It should also be noted that the memory described herein is intended to include, but is not limited to, these and any other suitable type of memory.

[0223] The embodiments of the present application also provide a computer readable storage medium, having stored thereon computer instructions for implementing the method executed by the apparatus (such as the network management device, the sending device, or the receiving device) in each of the above method embodiments.

[0224] The embodiments of the present application also provide a computer program product, containing instructions executed by a computer to implement the method executed by the apparatus (such as the network management device, the sending device, or the receiving device) in each of the above method embodiments.

[0225] The embodiments of the present application also provide a communication system, including at least one of the network management device, the sending device, or the receiving device in the above embodiments.

[0226] Optionally, the communication system further comprises an optical fiber.

[0227] The explanations and beneficial effects of the related contents in any one of the above provided devices can refer to the corresponding method embodiments provided above, and will not be repeated here.

[0228] Those skilled in the art can clearly understand that the units and algorithm steps of each example described in combination with the embodiments disclosed herein can be realized by electronic hardware or a combination of computer software and electronic hardware. Whether the functions are realized in hardware or software depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of the present application.

[0229] Those skilled in the art can clearly understand that, for the convenience and brevity of the description, the specific working processes of the above described system, device and unit can refer to the corresponding processes in the foregoing method embodiments, which will not be repeated here.

[0230] In several embodiments provided in the present application, it should be understood that the disclosed system, device and method can be realized by other ways. For example, the above described device embodiments are only schematic, for example, the division of the units is only a logical function division, and actual implementation can be in another division manner, for example, a plurality of units or components can be combined or integrated into another system, or some features can be ignored or not executed. In addition, the coupling or direct coupling or communication connection between the units shown or discussed can be indirect coupling or communication connection through some interface, device or unit, and can be electrical, mechanical or other forms.

[0231] The units described as separate components can or can not be physically separate, and the components shown as units can or can not be physical units, that is, they can be located in one place, or can be distributed on a plurality of network units. According to actual needs, part or all of the units can be selected to achieve the purpose of the embodiment.

[0232] In addition, each functional unit in each embodiment of the present application can be integrated in one processing unit, or each unit can be physically present separately, or two or more units can be integrated in one unit.

[0233] If the functions are implemented in the form of software function units and sold or used as independent products, they can be stored in a computer readable storage medium. Based on this understanding, the technical solutions of the present application or the parts that essentially contribute to the prior art or the parts of the technical solutions can be embodied in the form of a software product. The computer software product is stored in a storage medium and includes a plurality of instructions for causing a computer device (which can be a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of the present application. The aforementioned storage medium includes a U disk, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk or an optical disk, and various media that can store program codes.

[0234] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art can easily think of changes or replacements within the technical scope disclosed in the present application, which should be covered within the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A first optical terminal multiplexer (OTM) comprising: The first wavelength selective switch (WSS) and the first coupler are included. The first WSS is configured to receive a first service optical signal of a first wavelength and a first dummy optical signal of a second wavelength, perform wavelength multiplexing on the first service optical signal and the first dummy optical signal, and transmit the first service optical signal and the first dummy optical signal to a first port of the first coupler, wherein the first dummy optical signal is used to fill idle channels in the first WSS except a channel of the first service optical signal, and the first wavelength and the second wavelength are different. The first coupler is configured to transmit a first optical signal obtained by performing wavelength multiplexing on the first service optical signal and the first dummy optical signal to an optical fiber. The first OTM further includes a second WSS.

2. The first OTM of claim 1, wherein, The second WSS is configured to receive a second service optical signal of a third wavelength and transmit the second service optical signal to a second port of the first coupler. The first coupler is further configured to perform wavelength multiplexing on the first optical signal and the second service optical signal, and output the first optical signal and the second service optical signal to the optical fiber. The first OTM further includes a second WSS.

3. The first OTM of claim 1, wherein, The second WSS is configured to receive a second service optical signal of a third wavelength and a second dummy optical signal of the second wavelength, perform wavelength multiplexing on the second service optical signal and the second dummy optical signal, and transmit the second service optical signal and the second dummy optical signal to a second port of the first coupler, wherein the second dummy optical signal is used to fill idle channels in the first WSS except a channel of the first service optical signal and a channel of the second service optical signal in the second WSS, and the first wavelength, the third wavelength and the second wavelength are different. The first coupler is further configured to perform wavelength multiplexing on the first optical signal and a second optical signal, and output the first optical signal and the second optical signal to the optical fiber, wherein the second optical signal is obtained by performing wavelength multiplexing on the second service optical signal and the second dummy optical signal. The first OTM further includes a first variable optical attenuator (VOA) and a second VOA, wherein the first VOA is connected to the first port of the first coupler, and the second VOA is connected to the second port of the first coupler.

4. The first OTM of claim 3, wherein, The first VOA is configured to enable the first optical signal to pass through the first port of the first coupler. The second VOA is configured to enable the second optical signal to pass through the second port of the first coupler. The first OTM further includes a third VOA connected to a third port of the first coupler, and the third VOA is configured to block an external non-signal interference source when the third port of the first coupler is not connected to a WSS.

5. The first OTM of claim 4, wherein, The first wavelength belongs to a C band or an L band, the third wavelength belongs to the C band or the L band, and the second wavelength belongs to a C+L band.

6. The first OTM of any one of claims 2 to 5, wherein, The first OTM further includes a second coupler.

7. The first OTM of claim 1, wherein, The first WSS is further configured to receive a fourth service optical signal of a fourth wavelength, perform wavelength multiplexing on the fourth service optical signal and the first dummy optical signal, and output the fourth service optical signal and the first dummy optical signal to the first port of the first coupler or a first port of the second coupler. When the first coupler corresponds to a C band and the second coupler corresponds to an L band, the first wavelength belongs to the C band.

8. The first OTM of claim 7, wherein, ​ The first coupler is further configured to output an optical signal obtained by combining the first service optical signal and a C-band part of the first dummy optical signal to the optical fiber; If the fourth wavelength belongs to the L band, the second coupler is configured to output an optical signal obtained by combining the fourth service optical signal and an L-band part of the first dummy optical signal to the optical fiber; If the fourth wavelength belongs to the C band, the first coupler is further configured to output an optical signal obtained by combining the fourth service optical signal and a C-band part of the first dummy optical signal to the optical fiber.

9. The first OTM of claim 8, wherein, The first OTM further comprises a third WSS; The third WSS is configured to receive a fifth service optical signal of a fifth wavelength and output the fifth service optical signal to a second port of the first coupler or a second port of the second coupler; If the fifth wavelength belongs to the C band, the first coupler is further configured to output an optical signal obtained by combining the fifth service optical signal, the first service optical signal and a C-band part of the first dummy optical signal to the optical fiber; If the fifth wavelength belongs to the L band, the second coupler is configured to output the fifth service optical signal to the optical fiber.

10. The first OTM of claim 8, wherein, The first OTM further comprises a third WSS; The third WSS is configured to receive a fifth service optical signal of a fifth wavelength and a third dummy optical signal of the second wavelength, combine the fifth service optical signal and the third dummy optical signal, and output the combination to the second port of the first coupler or the second port of the second coupler, the third dummy optical signal being used to fill other idle channels in the first WSS except for channels of the first service optical signal and the fourth service optical signal and in the third WSS except for a channel of the fifth service optical signal.

11. The first OTM of claim 10, wherein, If the fifth wavelength belongs to the C band, the first coupler is further configured to output an optical signal obtained by combining the fifth service optical signal and a C-band part of the third dummy optical signal to the optical fiber; If the fifth wavelength belongs to the L band, the second coupler is configured to output an optical signal obtained by combining the fifth service optical signal and an L-band part of the third dummy optical signal to the optical fiber.

12. The first OTM of any one of claims 1 to 11, wherein, The first OTM supports access of M1*N1 optical signals, wherein M1 represents a number of input ports of the first WSS, N1 represents a number of input ports of the first coupler, and M1 and N1 are both integers greater than 1.

13. A second optical terminal multiplexer (OTM), characterized by Comprise: a fourth wavelength selective switch (WSS) and a first splitter; The first splitter is configured to receive a first optical signal from an optical fiber, split the first optical signal to obtain a first service optical signal of a first wavelength and a first dummy optical signal of a second wavelength, and output the first service optical signal to a first port of the fourth WSS; The fourth WSS is configured to receive the first service optical signal from the first port of the first splitter and output the first service optical signal.

14. The second OTM of claim 13, wherein, The second OTM further comprises a fifth WSS; The first splitter is further configured to receive a second optical signal from the optical fiber, and perform a wavelength division process on the second optical signal to obtain a second service optical signal of a third wavelength and a second dummy optical signal of the second wavelength, and output the second service optical signal to a first port of the fifth WSS. The fifth WSS is configured to receive the second service optical signal from a second port of the first splitter, and output the second service optical signal.

15. The second OTM of claim 13, wherein, The second OTM further comprises a fifth WSS. The first splitter is further configured to receive a second optical signal from the optical fiber, and perform a wavelength division process on the second optical signal to obtain a second service optical signal of a third wavelength and a second dummy optical signal of the second wavelength, and output the second service optical signal to a first port of the fifth WSS. The fifth WSS is configured to receive the second service optical signal from a second port of the first splitter, and output the second service optical signal.

16. The second OTM of claim 14 or 15, wherein, The first wavelength belongs to a C band or an L band, the third wavelength belongs to the C band or the L band, and the second wavelength belongs to a C+L band.

17. The second OTM of claim 13, wherein, The second OTM further comprises a second splitter. When the first splitter corresponds to the C band and the second splitter corresponds to the L band, the first wavelength belongs to the C band. If the fourth wavelength belongs to the L band, the second splitter is configured to receive an optical signal from the optical fiber, perform a wavelength division process on the optical signal to obtain a fourth service optical signal of the fourth wavelength and an L band part of the first dummy optical signal, and output the fourth service optical signal to a second port of the fourth WSS. If the fourth wavelength belongs to the C band, the first splitter is further configured to receive an optical signal from the optical fiber, perform a wavelength division process on the optical signal to obtain the fourth service optical signal and a C band part of the first dummy optical signal, and output the fourth service optical signal to a first port of the fourth WSS.

18. The second OTM of claim 17, wherein, The second OTM further comprises a sixth WSS. If the fifth wavelength belongs to the C band, the first splitter is further configured to receive an optical signal from the optical fiber, perform a wavelength division process on the optical signal to obtain the fifth service optical signal and a C band part of the third dummy optical signal, and output the fifth service optical signal to a first port of the sixth WSS. If the fifth wavelength belongs to the L band, the second splitter is configured to receive an optical signal from the optical fiber, perform a wavelength division process on the optical signal to obtain a fifth service optical signal of the fifth wavelength and an L band part of the third dummy optical signal of the second wavelength, and output the fifth service optical signal to a second port of the sixth WSS.

19. The second OTM of any one of claims 13 to 18, wherein, The second OTM supports M2*N2 optical signal outputs, where M2 represents the number of output ports of the fourth WSS, N2 represents the number of output ports of the first splitter, and M2 and N2 are both integers greater than 1.

20. An optical terminal multiplexer (OTM) system, characterized by, Comprising: The first optical terminal multiplexer (OTM) of any one of claims 1 to 12 and the second OTM of any one of claims 13 to 19, wherein the first OTM and the second OTM are connected by an optical fiber.

21. A wavelength division multiplexing (WDM) system, comprising: Comprising: An optical line amplifier OLA, a first optical terminal multiplexer OTM as claimed in any one of claims 1 to 12, and a second OTM as claimed in any one of claims 13 to 19; The OLA is configured to receive a first optical signal from an optical fiber, amplify the first optical signal, and output to the second OTM, wherein the first optical signal is obtained by combining a first service optical signal and a first dummy optical signal.

22. A light control method, comprising: An application applied to an optical terminal multiplexer OTM system, the OTM system comprising a first OTM and a second OTM, the first OTM comprising a first wavelength selective switch WSS and a first coupler, the second OTM comprising a fourth WSS and a first splitter, the method comprising: controlling the first WSS to receive a first service optical signal of a first wavelength and a first dummy optical signal of a second wavelength, combine the first service optical signal and the first dummy optical signal, and transmit to a first port of the first coupler, wherein the first dummy optical signal is used to fill other idle channels in the first WSS except the channel of the first service optical signal, and the first wavelength and the second wavelength are different; controlling the first coupler to combine the first service optical signal and the first dummy optical signal to obtain a first optical signal, and transmitting the first optical signal to an optical fiber; controlling the first splitter to receive the first optical signal from the optical fiber, split the first optical signal to obtain a first service optical signal of a first wavelength and a first dummy optical signal of a second wavelength, and output the first service optical signal to a first port of the fourth WSS; controlling the fourth WSS to receive the first service optical signal from the first port of the first splitter, and output the first service optical signal.

23. The method of claim 22, wherein, The first OTM further comprises a first variable optical attenuator VOA and a second VOA, wherein the first VOA is connected to the first port of the first coupler, and the second VOA is connected to the second port of the first coupler, and the method further comprises: controlling the first VOA to pass the first optical signal through the first port of the first coupler; controlling the second VOA to pass the second optical signal through the second port of the first coupler.

24. A light control device, characterized by An apparatus comprising at least one processor coupled with at least one memory, the at least one processor configured to execute computer programs or instructions stored in the at least one memory to cause the apparatus to perform the method of claim 22 or 23.

25. A chip system, characterized by comprising: at least one processor configured to call and run computer programs or instructions from the memory to cause a communication device installed with the chip system to perform the method of claim 22 or 23.

26. A computer-readable storage medium, characterized in that, The computer readable storage medium stores computer programs or instructions, when the computer programs or instructions are run on a computer, the method of claim 22 or 23 is executed.

27. A computer program product, characterised in that, comprising computer programs or instructions, when the computer programs or instructions are executed by a processor, the computer is caused to perform the method of claim 22 or 23.

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