Optical module and related equipment

Abstract

The embodiment of the invention provides an optical module and related equipment. The optical module and the related equipment are used for reducing the duration of power change in a wave adding and dropping scene. The optical module provided by the embodiment of the invention comprises an optical splitter, a detection unit, a non-mechanical optical switch and a false light unit. The non-mechanical optical switch comprises a first input port, a second input port, an electrical port and an output port. The first input port is connected with the optical splitter, and an input optical signal of the first assembly passes through the optical splitter and the first input port and then is output from the output port. The second input port is connected with the false light unit, and the electrical port is connected with the detection unit. And two output ports of the optical splitter are connected with the first input port and the detection unit. The detection unit is used for transmitting a first switching instruction to the non-mechanical optical switch when it is detected that the input optical signal is interrupted. And the non-mechanical optical switch is used for switching the input port connected with the output port from the first input port to the second input port according to the first switching instruction. The dummy light unit is used for providing dummy light.

Description

Technical Field

[0001] Embodiments of the present application relate to the field of optical communication, and in particular, to an optical module and related devices. Background Art

[0002] In an optical communication system, the optical signals transmitted may experience the phenomenon of adding or dropping wavelengths. Adding or dropping wavelengths occurs at certain nodes in the optical communication system (such as wavelength division multiplexing sites, fiber breakpoints, etc.), and optical signals in some or all communication wavelength bands are added or dropped at these nodes. Adding or dropping wavelengths will cause signal waveform changes, thereby affecting the signal transmission quality.

[0003] A method for compensating adding or dropping wavelengths is to connect a dummy optical module to the communication optical path through an optical switch. The communication optical path is used to transmit communication optical signals, and the dummy optical module is used to provide dummy light with the same wavelength band and the same power distribution as the communication optical signals. When the phenomenon of adding or dropping wavelengths occurs, the optical switch switches the connection state between the dummy optical module and the communication optical path. Specifically, when adding wavelengths, the optical switch disconnects the connection between the dummy optical module and the communication optical path, and when dropping wavelengths, the optical switch connects the dummy optical module to the communication optical path. The dummy light provided by the dummy optical module is used to ensure that the optical power in the communication optical path does not change suddenly, thereby ensuring the signal transmission quality.

[0004] However, there is an electrical response delay from when the system detects the occurrence of adding or dropping wavelengths to controlling the optical switch to switch, and the optical switch also has an inherent switching delay. Therefore, there is a long response time from the occurrence of adding or dropping wavelengths to the completion of the optical switch switching, and the optical power will still change suddenly during the response time, affecting the signal transmission quality. Summary of the Invention

[0005] Embodiments of the present application provide an optical module and related devices, which are used to reduce the duration of power change in the scenario of adding or dropping wavelengths, thereby reducing the bit error rate and improving the signal transmission quality.

[0006] In a first aspect, an embodiment of the present application provides an optical module, which includes a first component. The first component includes an optical splitter, a detection unit, a non-mechanical optical switch, and a dummy optical unit. Among them, the non-mechanical optical switch includes a first input port, a second input port, an electrical port, and an output port. The first input port is connected to the optical splitter, and the input optical signal of the first component passes through the optical splitter and the first input port and then is output from the output port. The second input port is connected to the dummy optical unit, and the electrical port is connected to the detection unit. Two output ports of the optical splitter are respectively connected to the first input port and the detection unit. The detection unit is configured to detect the input optical signal separated by the optical splitter to the detection unit, and transmit a first switching instruction to the non-mechanical optical switch when the input optical signal is detected to be interrupted. The non-mechanical optical switch is configured to switch the input port connected to the output port from the first input port to the second input port according to the first switching instruction. The dummy optical unit is configured to provide dummy light, and the dummy light has the same wavelength band and power distribution as the input optical signal.

[0007] In an optical module that realizes the switching between real and dummy light, the time delay from the addition / dropping of the wavelength to the completion of the real / dummy light switching is called the add / drop compensation time. The add / drop compensation time mainly includes the total electrical time delay (the total time delay for detecting the addition / dropping of the wavelength and triggering the switching of the optical switch) and the switching time delay of the optical switch. Among them, the switching time delay of the optical switch is usually in the order of milliseconds to hundreds of microseconds, which is the main factor affecting the add / drop compensation time. In the embodiment of the present application, a non-mechanical optical switch is used to replace the ordinary mechanical optical switch. Compared with the ordinary mechanical optical switch, the non-mechanical optical switch can reduce the switching time delay from the order of hundreds of microseconds to the sub-microsecond (less than 1 microsecond) order, thereby reducing the add / drop compensation time. Since the total electrical time delay is usually in the order of microseconds, the add / drop compensation time of the optical module provided by the embodiment of the present application can be reduced from the order of hundreds of microseconds to the order of microseconds. The reduction of the add / drop compensation time can greatly reduce the bit error rate of the communication system, thereby improving the signal transmission quality.

[0008] In an optional implementation manner, the first component further includes a delay optical path. The delay optical path is located between the first output port (of the optical splitter) and the first input port (of the non-mechanical optical switch), and is configured to generate a first time delay t1 of the input optical signal from the optical splitter to the first input port.

[0009] In the embodiment of the present application, the optical splitter divides the input optical signal into two paths for transmission. One path is transmitted to the non-mechanical optical switch through the delay optical path, and the other path transmits the dropped wavelength state to the non-mechanical optical switch through the detection unit. The added / dropped wavelength compensation delay T of the first component can be understood to consist of two parts. One part is the switching delay t3 of the optical switch; the other part is the time difference between the added / dropped wavelength being transmitted to the non-mechanical optical switch and the first switching instruction being transmitted to the non-mechanical optical switch, that is, the time difference between the two signals (the input optical signal reaching the non-mechanical optical switch through the delay optical path and the switching instruction reaching the non-mechanical optical switch through the detection unit) reaching the non-mechanical optical switch. The delay optical path can delay the time when the added / dropped wavelength is transmitted to the non-mechanical optical switch, thereby reducing the time difference between the two signals reaching the non-mechanical optical switch, and further reducing the added / dropped wavelength compensation time T, improving the signal transmission quality.

[0010] In an alternative implementation, the delay optical path includes: an optical fiber delay line or a spatial optical path.

[0011] In the embodiment of the present application, the preparation process of the optical fiber delay line is mature and the acquisition difficulty is low, which can reduce the cost and manufacturing difficulty of the optical module; the spatial optical path can make the input optical signal continuously reflect in a part of the space, with high space utilization rate, which can improve the integration degree of the optical module and reduce the volume of the optical module.

[0012] In an alternative implementation, assume that the time delay from the detection unit detecting the input optical signal to the switching instruction being transmitted to the optical switch is the second time delay t2, and the switching delay of the non-mechanical optical switch is the third time delay t3. If the first time delay t1 ≥ the second time delay t2, then the adjustment time T for the optical module to achieve added / dropped wavelength compensation is T = t3. If the first time delay t1 < the second time delay t2, then the adjustment time T for the optical module to achieve added / dropped wavelength compensation is T = t3 + t2 - t1.

[0013] In the embodiment of the present application, the compensation for the total electrical time delay (the second time delay t2) is achieved through the delay optical path (providing the first time delay t1). If the first time delay t1 ≥ the second time delay t2, then the input optical signal arrives at the non-mechanical optical switch no earlier than the switching instruction, and the delay optical path completely compensates for the total electrical delay of the optical module, making the adjustment time T only depend on the switching delay of the non-mechanical optical switch (the third time delay t3), so T = t3, achieving the maximum reduction of T.

[0014] The total electrical time delay t2 is usually in the order of microseconds, and the switching delay t3 of the non-mechanical optical switch is usually in the order of sub-microseconds. Based on applying the non-mechanical optical switch to reduce the adjustment time T from the order of hundreds of microseconds to the order of microseconds in the embodiment of the present application, the total electrical time delay t2 is compensated through the delay optical path, further reducing the adjustment time T from the order of microseconds (t2 + t3) to the order of sub-microseconds (t3).

[0015] If the first time delay t1 < the second time delay t2, the input optical signal arrives at the non-mechanical optical switch later than the switching instruction, and the delay optical path realizes partial compensation for the total electrical delay. In this case, the adjustment time T for the optical module to perform add / drop compensation consists of two parts. One part is the time difference t2 - t1 between the optical signal and the switching instruction arriving at the non-mechanical optical switch, and the other part is the switching time delay (the third time delay t3) of the non-mechanical optical switch. Therefore, the adjustment time T = t3 + t2 - t1, making the adjustment time T closer to the switching time delay (the third time delay t3, which is also the minimum value of the adjustment time T theoretically). Whether it is the input optical signal or the dummy optical signal, it must pass through the non-mechanical optical switch to be output to the communication link. Therefore, the switching time delay of the non-mechanical optical switch cannot be cancelled out, and the minimum value of the adjustment time T theoretically is the switching time delay t3 of the non-mechanical optical switch.

[0016] In an alternative implementation, assume that the time delay from when the detection unit detects the input optical signal to when the switching instruction is transmitted to the optical switch is the second time delay t2, and the switching time delay of the non-mechanical optical switch is t3. The optical splitter is directly connected to the first input port of the non-mechanical optical switch, and the adjustment time T for the optical module to perform add / drop compensation is T = t3 + t2.

[0017] In the embodiment of the present application, between the optical splitter and the non-mechanical optical switch, in addition to the line for transmitting the input optical signal (the line between the first output port and the first input port), a detection unit is inserted to detect the input optical signal and trigger the switching of the non-mechanical optical switch. Since both ends of the detection unit are directly connected to the optical splitter and the non-mechanical optical switch respectively, the optical path and the circuit for detection are shorter, so that the total electrical time delay (the second time delay t2) is shorter, thereby reducing the adjustment time T of the entire optical module.

[0018] In an alternative implementation, the adjustment time T for the optical module to perform add / drop compensation is T ≤ 10 microseconds.

[0019] In the embodiment of the present application, the adjustment time T of the switching module of the mechanical optical switch is usually above one hundred microseconds. Compared with the add / drop compensation optical module of the mechanical optical switch, the optical module using the non-mechanical optical switch provided in the embodiment of the present application reduces the adjustment time T from one hundred microseconds to less than 10 microseconds, thereby reducing the bit error rate to about 1 / 10 of that of the mechanical optical switch, achieving a great optimization of the bit error rate, and thus improving the signal transmission quality.

[0020] In an alternative implementation, the non-mechanical optical switch includes any one of the following: acousto-optic switch, electro-optic switch, or magneto-optic switch.

[0021] In the embodiments of the present application, the acousto-optic switch, electro-optic switch, and magneto-optic switch have high tolerance power and can withstand higher optical power, thereby achieving add-drop compensation for higher power requirements. For example, they are applicable in full-band scenarios, high-power transmission scenarios, etc. In hardware fault scenarios such as fiber breakage, optical amplifier board failure, multiplexer / demultiplexer failure, and subrack power-off, passive drop of the full band will occur. Through an optical module including the above non-mechanical optical switch with high tolerance power, full-band add-drop compensation can be achieved in passive drop scenarios to ensure communication quality.

[0022] In an alternative implementation, the optical module further includes a second component, and the structure of the second component is the same as that of the first component. The input port of the optical splitter in the first component is used to connect to the first optical amplifier. The first optical amplifier is used to amplify the optical signal of the first band and input it into the first component, and the first component is used to achieve add-drop compensation for the optical signal of the first band. The input port of the optical splitter in the second component is used to connect to the second optical amplifier. The second optical amplifier is used to amplify the optical signal of the second band and input it into the second component, and the second component is used to achieve add-drop compensation for the optical signal of the second band. The second band is different from the first band.

[0023] In the embodiments of the present application, by using different components to achieve add-drop compensation for signals of different bands respectively, the granularity of add-drop compensation can be refined, preventing the bands without add-drop from being covered by the false light accessed by add-drop compensation, thereby reducing the influence range of add-drop compensation on signal transmission. For example, if add-drop occurs in the communication link of the first band (such as optical amplifier failure or fiber breakage), the first component of the first band performs add-drop compensation on the first band. Since the first component is not connected to the communication link of the second band, during the add-drop compensation process, false light is only accessed on the communication link of the first band, and the add-drop compensation of the first component will not cause the signal of the second band to be covered by false light. On the other hand, since the reduction of the add-drop compensation time of the first component will cause power changes in the communication link of the second band, by using the first component provided in the embodiments of the present application to reduce the power change time of the first band (reduced to the adjustment time T), the power change time of the second band is correspondingly reduced, improving the signal transmission quality of the second band.

[0024] In an alternative implementation, the first band and the second band are any two of the following bands: O band, E band, S band, C band, L band, U band.

[0025] In an optional implementation, if the wave drop is caused by a fault, the input optical signal is retransmitted in the communication link after the fault is eliminated (input optical signal wave addition), and the first component can also automatically compensate for the wave addition of the input optical signal. Specifically, the detection unit is used to determine the communication link failure where the optical module is located when the input optical signal is detected to be interrupted. The detection unit is also used to receive an interaction instruction after sending the first switching instruction, and the interaction instruction is used to indicate that the fault has been eliminated. The detection unit is also used to send a second switching instruction to the electrical port according to the interaction instruction. The non-mechanical optical switch is used to switch the input port connected to the output port from the second input port to the first input port according to the second switching instruction.

[0026] In an optional implementation, the optical module is applied to a wavelength selection switch WSS. The WSS includes a first optical communication line, a second optical communication line, a first up / down wave node, and a second up / down wave node. An optical signal of a first wavelength is transmitted from the first optical communication line to the first up / down wave node, and an optical signal of a second wavelength is transmitted from the second optical communication line to the second up / down wave node. The optical module also includes a second component, and the structure of the second component is the same as that of the first component. The input port of the optical splitter in the first component is connected to the first optical communication line, and the output port of the first component is used to connect to the first up / down wave node, and the first up / down wave node is used to realize the up / down wave of the first wavelength signal. The input port of the optical splitter in the second component is connected to the second optical communication line, and the output port of the second component is used to connect to the second up / down wave node, and the second up / down wave node is used to realize the up / down wave of the second wavelength signal. The wavelength of the second wavelength signal is different from that of the first wavelength signal.

[0027] In the embodiment of the present application, the up / down wave compensation (wave drop compensation) of different wavelength signals in the WSS is realized through different components in the optical module. Since the components provided in the embodiment of the present application shorten the wave drop compensation time T (i.e., the adjustment time T of the wave drop compensation mentioned above), the switching time T' reserved for the up / down wave switching in the wave drop scenario of the WSS can be reduced, thereby reducing the time of the up / down wave switching. In addition, the wave drop compensation time is shortened, so that the corresponding band can be restored to the normal transmission state more quickly after the wave drop occurs, thereby improving the efficiency of signal transmission.

[0028] In an optional implementation, the switching time for adding and dropping waves on the first communication line in the WSS is T, the switching time for adding and dropping waves on the second communication line in the WSS is T, and the switching time allowed by the adding and dropping waves scenario is T', T≤T'.

[0029] In the embodiment of the present application, T' is the switching time corresponding to generating a target bit error rate in the adding / dropping wave scenario. The adjustment time T for the component to perform adding / dropping wave compensation is also the switching time T of the WSS. The switching time T of the WSS + the system control delay time (i.e., the time from when the up / down wave command is issued externally to when the up / down wave node completes the up / down wave switching) ≤ T'.

[0030] In an alternative implementation, the first wavelength signal and the second wavelength signal are signals with different wavelengths in any of the following wavelength bands: O band, E band, S band, C band, L band, U band.

[0031] In an alternative implementation, in the optical module applied to the WSS, the detection unit can also implement compensation for adding waves in the case of adding waves. Specifically, the detection unit is further configured to send a second switching instruction to the electrical port when detecting an input optical signal (i.e., detecting the case of adding waves). The non-mechanical optical switch is configured to switch the input port connected to the output port from the second input port to the first input port according to the second switching instruction.

[0032] In an alternative implementation, in the scenario of actively adding / dropping waves, the first component can also automatically compensate for the added waves of the input optical signal. Specifically, the detection unit is further configured to send a second switching instruction to the electrical port when detecting an input optical signal. The non-mechanical optical switch is configured to switch the input port connected to the output port from the second input port to the first input port according to the second switching instruction.

[0033] In a second aspect, the embodiment of the present application provides an optical communication device. The optical communication device includes a first optical amplifier, a second optical amplifier, a first optical module, and a second optical module. The first optical module and the second optical module are the optical modules described in the first aspect. The first optical module is connected to the first optical amplifier, and the first optical amplifier is configured to amplify and transmit the optical signal in the first wavelength band to the first optical module. The second optical module is connected to the second optical amplifier, and the second optical amplifier is configured to amplify and transmit the optical signal in the second wavelength band to the second optical module, and the second wavelength band is different from the first wavelength band.

[0034] In an alternative implementation, the first wavelength band and the second wavelength band are any two of the following wavelength bands: O band, E band, S band, C band, L band, U band.

[0035] For the beneficial effects of the second aspect, refer to the first aspect, which will not be elaborated here. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 It is a schematic structural diagram of the adding / dropping wave compensation system provided by the present application;

[0037] Figure 2Schematic structural diagram of the optical module provided by the embodiment of the present application;

[0038] Figure 3 Schematic structural diagram of the optical module including a delay optical path provided by the embodiment of the present application;

[0039] Figure 4a Schematic diagram of the add / drop wave compensation time of the optical module provided by the embodiment of the present application;

[0040] Figure 4b Schematic diagram of the add / drop wave compensation time of the optical module including a delay optical path provided by the embodiment of the present application;

[0041] Figure 5 Schematic structural diagram of the optical module including multiple components provided by the embodiment of the present application;

[0042] Figure 6 Schematic structural diagram of the optical communication device including multiple optical modules provided by the embodiment of the present application;

[0043] Figure 7 Schematic structural diagram of the wavelength selective switch provided by the embodiment of the present application. Detailed implementation manners

[0044] The embodiments of the present application will be described below with reference to the accompanying drawings. It can be known to those of ordinary skill in the art that with the development of technology and the emergence of new scenarios, the technical solutions provided by the embodiments of the present application are also applicable to similar technical problems.

[0045] In the description, claims and the above-mentioned drawings of this application, terms such as "first", "second", etc. are used to distinguish similar objects, and do not necessarily describe a specific order or sequence. It should be understood that such terms can be interchanged under appropriate circumstances, which is only a way of distinguishing objects with the same attributes when describing embodiments of this application. In addition, the terms "comprising" and "having" and any variations thereof are intended to cover non-exclusive inclusion, so that a process, method, system, product or device comprising a series of units does not have to be limited to those units, but may include other units not clearly listed or inherent to these processes, methods, products or devices. Additionally, "at least one" means one or more, and "a plurality" means two or more. "And / or" describes the association relationship of associated objects, indicating that three relationships can exist. For example, A and / or B can represent: A exists alone, A and B exist simultaneously, and B exists alone, where A and B can be singular or plural. The character " / " generally indicates that the associated objects before and after are in an "or" relationship. "At least one (item)" or similar expressions thereof refer to any combination of these items, including any combination of single item (s) or plural items (s). For example, at least one (item) of a, b, or c can represent: a, b, c, a - b, a - c, b - c, or a - b - c, where a, b, c can be single or multiple.

[0046] In an optical communication system, the optical signals transmitted may experience the phenomenon of adding / dropping wavelengths. Adding / dropping wavelengths refers to the addition or dropping of partial band signals or full band signals that occur at certain nodes. Adding / dropping wavelengths includes active adding / dropping and passive dropping.

[0047] Active adding / dropping mainly appears in scenarios such as signal wavelength addition / dropping, channel expansion, in - network testing, and channel cut - over. Among them, signal wavelength addition / dropping is the addition or dropping of partial wavelength signals performed by relay stations in a wavelength - division multiplexing communication system.

[0048] Passive dropping mainly appears in scenarios such as fiber breakage, optical amplifier board failure, multiplexer / demultiplexer (such as WSS) failure, and sub - rack power - off. Passive dropping is usually the dropping of full - band signals, and has characteristics such as fast dropping speed and large power change.

[0049] Whether it is active adding / dropping or passive dropping, the power of the adding / dropping wavelength band will change. And due to optical amplifier effects and stimulated raman scattering (SRS) effects, etc., the change in the power of the adding / dropping wavelength band will also cause fluctuations in the power of other wavelength bands. Therefore, adding / dropping wavelengths will cause signal waveform changes, thereby affecting signal transmission quality. In severe cases of waveform change, bit errors may also occur.

[0050] To prevent the power fluctuations during adding / dropping waves from affecting the communication quality, a method for adding / dropping wave compensation is to use dummy light to compensate for the sudden power change during adding / dropping waves. As Figure 1 shown, the adding / dropping wave compensation system includes a detection unit, an optical switch, a dummy light module, and a control circuit, etc. The detection unit is used to detect the occurrence of adding / dropping waves in the optical communication link, and the control circuit is used to control the optical switch to switch when adding / dropping waves occur. The optical switch (or optical attenuator) is used to connect or disconnect the dummy light module to the optical communication link. The dummy light module is used to provide dummy light, which is also called standby light and has the same wavelength and power distribution as the communication optical signal transmitted in the optical communication link.

[0051] If a dropping wave occurs in the optical communication link, the control circuit controls the optical switch to connect the dummy light module to the optical communication link, and the dummy light is transmitted into the optical communication link to achieve power compensation for the dropping wave. If an adding wave occurs in the optical communication link, the control circuit controls the optical switch to disconnect the connection between the dummy light module and the optical communication link, and by accessing the dummy light in the optical communication link before adding the wave, the power stability before and after adding the wave is ensured.

[0052] However, starting from the occurrence of adding / dropping waves, there is a certain detection delay for the detection unit to detect the occurrence of adding / dropping waves, there is a certain circuit transmission delay for the control circuit to issue a switching instruction to the optical switch, and the optical switch also has an inherent switching delay. The existence of the above detection delay, circuit transmission delay, and switching delay results in a relatively long adding / dropping wave compensation time from the occurrence of adding / dropping waves to the completion of adding / dropping wave compensation (the optical switch completes the switching).

[0053] During the process of adding / dropping wave compensation, there will be a sudden power change in the optical communication link. For example, in the dropping wave scenario, at the moment when the dropping wave occurs, the power of the signal transmitted in the optical communication link drops suddenly. The adding / dropping wave compensation system compensates for the dropping wave, and at the moment when the adding / dropping wave compensation is completed (the optical switch completes the switching), the power of the signal transmitted in the optical communication link returns to the state before the dropping wave occurred. The power of the signal transmitted in the optical communication link will fluctuate during the adding / dropping wave compensation time, thus affecting the quality of signal transmission. The situation of adding waves is the same, which will not be elaborated here.

[0054] To solve the above problems, the embodiments of the present application provide an optical module and related devices. By using a non-mechanical optical switch and a relatively simple connection structure, the adding / dropping wave compensation time is reduced, thereby reducing the duration of power fluctuations caused by adding / dropping waves and improving the signal transmission quality.

[0055] As Figure 2 shown, the optical module provided by the embodiments of the present application includes a first component 2000a. The first component 2000 includes an optical splitter 2100, a detection unit 2200, a non-mechanical optical switch 2300, and a dummy light unit 2400.

[0056] The non-mechanical optical switch 2300 includes a first input port 2310, a second input port 2320, an electrical port 2330, and an output port 2340. The first input port 2310 is connected to the optical splitter 2100. The input optical signal of the first component passes through the optical splitter 2100 and the first input port 2310 and is then output from the output port 2340. The second input port 2320 is connected to the dummy optical unit 2400, and the electrical port 2330 is connected to the detection unit 2200.

[0057] Two output ports of the optical splitter 2100 are respectively connected to the first input port 2310 and the detection unit 2200. The optical splitter 2100 is used to split and transmit the input optical signal of the first component 2000a to the first input port 2310 and the detection unit 2200. Since the detection unit 2200 is mainly used to implement signal detection and has a relatively low power requirement for the input optical signal. Therefore, the power of the input optical signal transmitted by the optical splitter 2100 to the first input port 2310 is much greater than the power of the input optical signal transmitted to the detection unit 2200.

[0058] The detection unit 2200 is used to detect the input optical signal separated by the optical splitter 2100 and transmitted to the detection unit 2200. If the detection unit 2200 detects an interruption of the input optical signal, it indicates that the input optical signal has dropped a wave. In the case of detecting an interruption of the input optical signal, the detection unit 2200 sends a first switching instruction to the electrical port.

[0059] The non-mechanical optical switch 2300 is used to switch the input port connected to the output port 2340 from the first input port 2310 to the second input port 2320 according to the first switching instruction. Thereby, dummy light is connected to the communication link (output port 2340), and the dropped wave compensation of the input optical signal is realized through the dummy light.

[0060] The dummy optical unit 2400 is used to provide dummy light, and the dummy light has the same wavelength band and power distribution as the input optical signal.

[0061] The above describes the signal transmission in the case of a dropped wave. In the case of adding a wave, the detection unit 2200 can detect the input optical signal. That is, when the detection unit 2200 detects a sudden increase in power, it indicates that the input optical signal has added a wave. In the case of detecting the input optical signal, the detection unit 2200 sends a second switching instruction to the electrical port. The non-mechanical optical switch 2300 switches the input port connected to the output port 2340 from the second input port 2320 to the first input port 2310 according to the second switching instruction. Thereby, the connection of the dummy light to the communication link (output port 2340) is stopped, and the real light (input optical signal) is started to be connected to the communication link, and the added wave compensation of the input optical signal is realized through the dummy light.

[0062] In an optical module that implements add-drop compensation, the time delay from the occurrence of add-drop to the completion of add-drop compensation (the optical switch completes the switching) is called the add-drop compensation time. The add-drop compensation time mainly includes the total electrical time delay (the total time delay for detecting the occurrence of add-drop and triggering the optical switch to switch) and the switching time delay of the optical switch.

[0063] The switching time delay of the optical switch is usually in the order of milliseconds to hundreds of microseconds, which is the main factor affecting the add-drop compensation time. In the embodiments of the present application, a non-mechanical optical switch is used to replace the ordinary mechanical optical switch. Compared with the ordinary mechanical optical switch, the non-mechanical optical switch can reduce the switching time delay from the order of hundreds of microseconds to the sub-microsecond (less than 1 microsecond) order, thereby reducing the add-drop compensation time. Since the total electrical time delay is usually in the order of microseconds, the add-drop compensation time can be reduced from the order of hundreds of microseconds to the order of microseconds through the optical module provided by the embodiments of the present application. The reduction of the add-drop compensation time can greatly reduce the bit error rate of the communication system, thereby improving the signal transmission quality.

[0064] In Figure 2 Based on the shown structure, the total electrical time delay can also be compensated by delaying the optical path, thereby further reducing the add-drop compensation time. As Figure 3 shown, the first component 2000a further includes a delay optical path 2500, and the delay optical path 2500 is located between the optical splitter 2100 and the first input port 2310. The delay optical path 2500 is used to generate a first time delay t1 of the input optical signal from the optical splitter 2100 to the first input port 2310.

[0065] Taking the drop-wave scenario as an example below, it is explained how the delay optical path 2500 reduces the adjustment time T for the optical module to perform add-drop. As Figure 3 shown, the time difference between the occurrence of the drop-wave at the optical splitter 2100 and the detection unit 2200 detecting the occurrence of the drop-wave is the detection time delay, and the time difference between the first switching instruction sent by the detection unit 2200 and the first switching instruction being transmitted to the electrical port 2330 is the circuit transmission time delay. The sum of the detection time delay and the circuit transmission time delay is the total electrical time delay t2, and the switching time delay of the non-mechanical optical switch is t3.

[0066] As Figure 4aAs shown, if the delay optical path 2500 is not included in the first component 2000a, after wave loss (power sudden drop) occurs at the optical splitter 2100, the wave loss is transmitted to the detection unit 2200 along the optical path between the optical splitter 2100 and the detection unit 2200 (detection time delay), and the first switching instruction generated by the detection unit 2200 is transmitted to the non-mechanical optical switch 2300 along the circuit between the detection unit 2200 and the electrical port 2330 (circuit transmission time delay). The sum of the detection time delay and the circuit transmission time delay is the total electrical time delay t2. After the first switching instruction is transmitted to the non-mechanical optical switch 2300, the time delay for the non-mechanical optical switch 2300 to complete the switching is called the optical switch switching time delay t3. Then t2 + t3 is the add / drop wave compensation time T of the optical module.

[0067] If a delay optical path 2500 is added between the optical splitter 2100 and the non-mechanical optical switch 2300, then as Figure 3 shown. The optical splitter 2100 divides the input optical signal into two paths for transmission. For the path passing through the delay optical path 2500, after wave loss occurs at the optical splitter 2100, it takes the first time delay t1 of the delay optical path 2500 for the wave loss to be transmitted to the non-mechanical optical switch 2300. For the path passing through the detection unit 2200, it takes the total electrical time delay t2 for the wave loss to be transmitted to the non-mechanical optical switch 2300 (that is, the first switching instruction reaches the non-mechanical optical switch 2300). The corresponding power change is as Figure 4b shown.

[0068] In the embodiment of the present application, the optical splitter 2100 divides the input optical signal into two paths for transmission. One path is transmitted to the non-mechanical optical switch 2300 through the delay optical path 2500, and the other path transmits the wave loss state to the non-mechanical optical switch 2300 through the detection unit 2200. The add / drop wave compensation time delay T of the optical module can be understood to consist of two parts. One part is the switching time delay t3 of the optical switch; the other part is the time difference between when the add / drop wave is transmitted to the non-mechanical optical switch 2300 and when the first switching instruction is transmitted to the non-mechanical optical switch 2300, that is, the time difference between when the two signals (the input optical signal reaching the non-mechanical optical switch 2300 through the delay optical path and the switching instruction reaching the non-mechanical optical switch 2300 through the detection unit 2200) reach the non-mechanical optical switch 2300. As Figure 4b shown, the delay optical path 2500 can delay the time when the add / drop wave is transmitted to the non-mechanical optical switch 2300, thereby reducing the time difference between the two signals reaching the non-mechanical optical switch 2300, and further reducing the add / drop wave compensation time T and improving the signal transmission quality.

[0069] Optionally, the delay optical path 2500 can be an optical fiber delay line, a spatial optical path, etc. If the delay optical path 2500 is an optical fiber delay line, since the preparation process of the optical fiber delay line is mature and the acquisition difficulty is low, the cost and manufacturing difficulty of the optical module can be reduced. If the delay optical path 2500 is a spatial optical path, since the spatial optical path can make the input optical signal continuously reflect in a part of the space and the space utilization rate is high, the integration degree of the optical module can be improved and the volume of the optical module can be reduced. Optionally, the spatial optical path can include multiple reflecting surfaces for realizing the reflection of the input optical signal.

[0070] In Figure 3 the structure shown, the add-drop compensation time T of the optical module depends on the relationship between the delay time t1 of the delay optical path (also referred to as the first delay time) and the total electrical delay time t2 (also referred to as the second delay time).

[0071] Specifically, as Figure 3 shown, if the first delay time t1 ≥ the second delay time t2, the input optical signal arrives at the non-mechanical optical switch 2300 not earlier than the switching instruction, and the delay optical path 2500 completely compensates for the total electrical delay of the optical module. In this case, the adjustment time T for the optical module to perform add-drop compensation only depends on the switching delay time (the third delay time t3) of the non-mechanical optical switch, so T = t3.

[0072] The total electrical delay time t2 is usually in the order of microseconds, and the switching delay time t3 of the non-mechanical optical switch is usually in the order of sub-microseconds. Based on the application of the non-mechanical optical switch in reducing the adjustment time T from the order of hundreds of microseconds to the order of microseconds in the embodiments of the present application, the total electrical delay time t2 is compensated by the delay optical path, and the adjustment time T is further reduced from the order of microseconds (t2 + t3) to the order of sub-microseconds (t3).

[0073] As Figure 4b shown, if the first delay time t1 < the second delay time t2, the input optical signal arrives at the non-mechanical optical switch 2300 later than the switching instruction, and the delay optical path 2500 realizes partial compensation for the total electrical delay t2. In this case, the adjustment time T for the optical module to perform add-drop compensation consists of two parts. One part is the time difference t2 - t1 between the optical signal and the switching instruction arriving at the non-mechanical optical switch, and the other part is the switching delay time (the third delay time t3) of the non-mechanical optical switch 2300, so T = t3 + t2 - t1.

[0074] If the first delay time t1 = the second delay time t2, the optical module can compensate for the total electrical delay to the greatest extent. If the first delay time t1 > t2, it will additionally increase the optical path of the input optical signal, and the increase in this optical path is not helpful for shortening T, but will introduce additional transmission loss, so t1 ≤ t2 can be limited. In order to shorten the adjustment time T to the greatest extent, t1 = t2 can be made.

[0075] Optionally, if there is no delay optical path 2500 between the optical splitter 2100 and the non-mechanical optical switch 2300, the first output port 2310 of the optical splitter 2100 and the non-mechanical optical switch 2300 are directly connected. Then, as Figure 4a shown, the adjustment time T for the optical module to perform add / drop compensation consists of two parts. One part is the total electrical delay t2, and the other part is the switching delay of the non-mechanical optical switch (the third delay t3). Therefore, T = t3 + t2.

[0076] In the optical module provided by the embodiment of the present application, the first component 2000a can be an add / drop compensation component for the full band, or an add / drop compensation component for a partial band or wavelength. The present application does not make any limitation on this. Next, the descriptions will be separately expanded:

[0077] 1. The first component 2000a is used to implement add / drop compensation for the full band.

[0078] In an optional implementation manner, the first component 2000a is used to implement add / drop compensation for the full band. The full band can be any one of the O band, E band, S band, C band, L band, and U band.

[0079] 2. The first component 2000a is used to implement add / drop compensation for a partial band.

[0080] In an optional implementation manner, the first component 2000a is used to implement add / drop compensation for a partial band. For example Figure 5 shown, the optical module includes a first component 2000a and a second component 2000b, and the second component 2000b has the same structure as the first component 2000a.

[0081] The input port of the optical splitter 2100 in the first component 2000a is used to connect to the first optical amplifier. The first optical amplifier is used to amplify the optical signal of the first band and input it into the first component 2000a, and the first component 2000a is used to implement add / drop compensation for the optical signal of the first band. The input port of the optical splitter in the second component 2000b is used to connect to the second optical amplifier. The second optical amplifier is used to amplify the optical signal of the second band and input it into the second component 2000b, and the second component 2000b is used to implement add / drop compensation for the optical signal of the second band. The second band is different from the first band.

[0082] In the embodiment of the present application, by using different components to respectively implement add / drop compensation for signals of different bands, the granularity of add / drop compensation can be refined, preventing the bands without add / drop from being covered by the false light accessed by the add / drop compensation, thereby reducing the influence range of the add / drop compensation on signal transmission. For example Figure 5In the case where a communication link in the first wavelength band experiences signal addition or removal (such as a failure of the first optical amplifier or a fiber break in the optical fiber), the first component 2000a in the first wavelength band performs signal addition or removal compensation for the first wavelength band. Since the first component 2000a is not connected to the communication link in the second wavelength band, during the signal addition or removal compensation process, only dummy light is inserted into the communication link in the first wavelength band, and the signal addition or removal compensation of the first component 2000a will not cause the signal in the second wavelength band to be covered by the dummy light.

[0083] On the other hand, since a decrease in the signal addition or removal compensation time of the first component 2000a will cause a power change in the communication link in the second wavelength band, by using the first component 2000a provided in the embodiment of the present application to reduce the power change time in the first wavelength band (reduced to the adjustment time T), the power change time in the second wavelength band is correspondingly reduced, improving the signal transmission quality in the second wavelength band.

[0084] In an optional implementation manner, the first wavelength band and the second wavelength band are any two of the following wavelength bands: O band, E band, S band, C band, L band, U band.

[0085] It should be noted that Figure 5 Taking two wavelength bands as an example to illustrate the signal addition or removal compensation of different components for different wavelength bands does not limit the number of components and corresponding wavelength bands. The signal addition or removal compensation for n wavelength bands can be realized by n components respectively, where n is any integer greater than 1.

[0086] The embodiment of the present application also provides an optical communication device. The optical communication device realizes signal addition or removal compensation for different wavelength band signals through components on different optical modules. As Figure 6 shown, the optical communication device includes a first optical amplifier, a second optical amplifier, a first optical module, and a second optical module. The first optical module and the second optical module are Figure 2 the optical modules described in any one of the embodiments from

[0087] The first optical module is connected to the first optical amplifier, and the first optical amplifier is used to amplify and transmit the optical signal in the first wavelength band to the first optical module. The second optical module is connected to the second optical amplifier, and the second optical amplifier is used to amplify and transmit the optical signal in the second wavelength band to the second optical module, where the second wavelength band is different from the first wavelength band.

[0088] In an optional implementation manner, the first wavelength band and the second wavelength band are any two of the following wavelength bands: O band, E band, S band, C band, L band, U band.

[0089] In the above-mentioned add / drop wave compensation scenarios for the full band or partial bands, the non-mechanical optical switch in the first component 2000a can be an acousto-optic switch, an electro-optic switch, a magneto-optic switch, etc., which are optical switches with high power tolerance. In the embodiments of the present application, the acousto-optic switch, the electro-optic switch, and the magneto-optic switch have high power tolerance and can withstand higher optical power, thereby realizing add / drop wave compensation with higher power requirements. For example, it can be applied to full-band add / drop wave compensation scenarios, high-power transmission scenarios, etc.

[0090] Exemplarily, in hardware fault scenarios such as fiber breakage, optical amplifier board failure, multiplexer / demultiplexer failure, and subrack power-off, passive drop wave in the full band or partial bands will occur. Through the optical module including the above-mentioned non-mechanical optical switch with high power tolerance, add / drop wave compensation for the full band or partial bands can be realized in the passive drop wave scenario, ensuring communication quality.

[0091] In an optional implementation manner, if the drop wave is caused by faults such as optical amplifier failure and fiber breakage, after the faults are eliminated, the input optical signal can be transmitted in the communication link again (adding wave to the input optical signal), and the components provided in the embodiments of the present application (the first component 2000a, the second component 2000b, etc.) can also automatically compensate for the adding wave of the input optical signal.

[0092] Specifically, the detection unit 2200 is used to determine the failure of the communication link where the optical module is located when detecting the interruption of the input optical signal. After the detection unit 2200 sends the first switching instruction, if the operator eliminates the fault, the operator can transmit an interaction instruction to the detection unit 2200 through an interaction interface, a program, etc. The interaction instruction is used to indicate that the fault has been eliminated. After receiving the interaction instruction, the detection unit 2200 sends a second switching instruction to the electrical port 2330 according to the interaction instruction. The non-mechanical optical switch 2300 switches the input port connected to the output port 2340 from the second input port 2320 to the first input port 2310 according to the second switching instruction.

[0093] 3. The first component 2000a is used to realize add / drop wave compensation for partial wavelengths.

[0094] In an optional implementation manner, the first component 2000a is used to realize add / drop wave compensation for partial wavelengths. For example Figure 7 As shown, the optical module is applied to a wavelength select switch (WSS). The WSS includes a first optical communication line, a second optical communication line, a first add / drop node, and a second add / drop node. The optical signal of the first wavelength is transmitted from the first optical communication line to the first add / drop node, and the optical signal of the second wavelength is transmitted from the second optical communication line to the second add / drop node.

[0095] The optical module includes a first component 2000a and a second component 2000b, and the second component 2000b has the same structure as the first component 2000a. The input port of the optical splitter in the first component 2000a is connected to the first optical communication line, and the output port of the first component 2000a (i.e., the output port 2340 of the non-mechanical optical switch 2300 in the first component 2000a) is used to connect to the first add-drop node, and the first add-drop node is used to implement the add-drop of the first wavelength signal. The input port of the optical splitter in the second component 2000b is connected to the second optical communication line, and the output port of the second component 2000b (i.e., the output port 2340 of the non-mechanical optical switch 2300 in the second component 2000b) is used to connect to the second add-drop node, and the second add-drop node is used to implement the add-drop of the second wavelength signal. The wavelength of the second wavelength signal is different from that of the first wavelength signal.

[0096] In the embodiment of the present application, the add-drop compensation (add-drop compensation) of different wavelength signals in the WSS is realized through different components in the optical module. Since the components (the first component 200a, the second component 2000b, etc.) provided in the embodiment of the present application shorten the add-drop compensation time T (i.e., the adjustment time T of the aforementioned add-drop compensation), the switching time T' reserved by the WSS for add-drop switching in the add-drop scenario can be reduced, thereby reducing the time of add-drop switching. Moreover, shortening the add-drop compensation time enables the corresponding wavelength band to return to the normal transmission state faster after the add-drop occurs, thereby improving the signal transmission efficiency.

[0097] In an optional implementation manner, the switching time for implementing add-drop of the first communication line in the WSS is T, the switching time for implementing add-drop of the second communication line in the WSS is T, and the allowable switching time for the add-drop scenario is T', and T ≤ T'.

[0098] In an optional implementation manner, the first wavelength signal and the second wavelength signal are signals with different wavelengths in any of the following wavelength bands: O band, E band, S band, C band, L band, U band.

[0099] It should be noted that Figure 7 Taking the first component 2000a and the second component 2000b as examples to illustrate the add-drop compensation components of different wavelength signals in the WSS does not limit the number of wavelengths in the WSS and the number of corresponding add-drop compensation components.

[0100] In an optional implementation manner, in the scenario of active add-drop, the components (the first component 2000a, the second component 2000b, etc.) provided in the embodiment of the present application can also automatically compensate for the add-wave of the input optical signal.

[0101] Specifically, if the detection unit 2200 detects an input optical signal, it indicates that the input optical signal is added to the communication link where the component is located. The detection unit 2200 can then send a second switching instruction to the electrical port 2330. According to the second switching instruction, the non-mechanical optical switch 2300 switches the input port connected to the output port 2340 from the second input port 2320 to the first input port 2310.

[0102] In the above-mentioned adding / dropping wave compensation scenarios for the full band, partial band, or wavelength division wavelengths, in the component (such as the first component 2000a, the second component 2000b, etc.), between the optical splitter 2100 and the first input port 2310, it can be connected through the delay optical path 2500 or directly connected. This application does not make any limitations in this regard.

[0103] In the above-mentioned adding / dropping wave compensation scenarios for the full band, partial band, or wavelength division wavelengths, through the setting of the non-mechanical optical switch 2300, Figures 2 to 7 the connection structure of the detection unit 2200 shown and the delay optical path 2500 (optional), the adjustment time T for the optical module to achieve adding / dropping wave compensation can be shortened, such that the adjustment time T ≤ 10 microseconds.

[0104] In the embodiments of the present application, the adjustment time T of the switching module of the mechanical optical switch is usually above one hundred microseconds. Compared with the adding / dropping wave compensation optical module of the mechanical optical switch, the optical module using the non-mechanical optical switch 2300 provided in the embodiments of the present application reduces the adjustment time T from one hundred microseconds to less than 10 microseconds, thereby reducing the bit error rate to about 1 / 10 of that of the mechanical optical switch, achieving a significant optimization of the bit error rate, and thus improving the signal transmission quality.

[0105] Those skilled in the art can clearly understand that for the convenience and brevity of description, the specific working processes of the above-described systems, devices, and units can refer to the corresponding processes in the foregoing method embodiments and will not be elaborated herein.

[0106] In several embodiments provided in the present application, it should be understood that the disclosed systems, devices, and methods can be implemented in other ways. For example, the device embodiments described above are merely illustrative. For example, the division of the units is only a logical function division, and there can be other division methods in actual implementation. For example, multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the displayed or discussed couplings or direct couplings or communication connections to each other can be through some interfaces, and the indirect couplings or communication connections of the devices or units can be in electrical, mechanical, or other forms.

[0107] The unit described as a separation component may or may not be physically separated. The component displayed as a unit may or may not be a physical unit, that is, it may be located in one place or distributed to multiple network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0108] In addition, each functional unit in various embodiments of the present application may be integrated in a processing unit, may exist separately as individual physical units, or two or more units may be integrated in one unit. The above-mentioned integrated unit can be implemented in the form of hardware or in the form of a software functional unit.

[0109] If the above-mentioned integrated unit is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on such an understanding, the technical solution of the present application, in essence, or the part that contributes to the prior art, or all or part of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the methods described in various embodiments of the present application. The foregoing storage medium includes: various media such as USB flash drives, mobile hard disks, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical discs that can store program codes.

Claims

1. An optical module, characterized in that, Comprising a first component; The first component includes an optical splitter, a detection unit, a non-mechanical optical switch, and a dummy light unit; The non-mechanical optical switch includes a first input port, a second input port, an electrical port, and an output port. The first input port is connected to the optical splitter. The input optical signal of the first component passes through the optical splitter and the first input port and then is output from the output port. The second input port is connected to the dummy light unit, and the electrical port is connected to the detection unit; Two output ports of the optical splitter are respectively connected to the first input port and the detection unit; The detection unit is configured to detect the input optical signal separated by the optical splitter to the detection unit, and in the case of detecting an interruption of the input optical signal, send a first switching instruction to the electrical port; The non-mechanical optical switch is configured to, according to the first switching instruction, switch the input port connected to the output port from the first input port to the second input port; The dummy light unit is configured to provide dummy light, and the dummy light has the same wavelength band and power distribution as the input optical signal.

2. The optical module according to claim 1, characterized in that, The first component further includes a delay optical path, and the delay optical path is located between the optical splitter and the first input port; The delay optical path is configured to generate a first time delay t1 of the input optical signal from the optical splitter to the first input port.

3. The optical module according to claim 2, characterized in that, The delay optical path includes: an optical fiber delay line or a spatial optical path.

4. The optical module according to claim 2 or 3, characterized in that, The time delay from the detection unit detecting the input optical signal to the switching instruction being transmitted to the optical switch is a second time delay t2, and the switching time delay of the non-mechanical optical switch is a third time delay t3; If the first time delay t1 ≥ the second time delay t2, the adjustment time T for the optical module to achieve add / drop wavelength compensation is T = t3; If the first time delay t1 < the second time delay t2, the adjustment time T for the optical module to achieve add / drop wavelength compensation is T = t3 + t2 - t1.

5. The optical module according to claim 1, characterized in that, The time delay from the detection unit detecting the input optical signal to the switching instruction being transmitted to the optical switch is a second time delay t2, and the switching time delay of the non-mechanical optical switch is a third time delay t3; The first input port is directly connected to the optical splitter, and the adjustment time T for the optical module to achieve add / drop wavelength compensation is T = t3 + t2.

6. The optical module according to claim 4 or 5, characterized in that, The adjustment time T ≤ 10 microseconds.

7. The optical module according to any one of claims 1 to 6, characterized in that, The non-mechanical optical switch includes any one of the following: An acousto-optic switch, an electro-optic switch, or a magneto-optic switch.

8. The optical module according to any one of claims 2 to 7, characterized in that, It further includes a second component, and the structure of the second component is the same as that of the first component; The input port of the optical splitter in the first component is used to be connected to a first optical amplifier, and the first optical amplifier is configured to amplify the optical signal in the first wavelength band and input it into the first component, and the first component is configured to achieve add / drop wavelength compensation for the optical signal in the first wavelength band; The input port of the optical splitter in the second component is used to be connected to a second optical amplifier, and the second optical amplifier is configured to amplify the optical signal in the second wavelength band and input it into the second component, and the second component is configured to achieve add / drop wavelength compensation for the optical signal in the second wavelength band, and the second wavelength band is different from the first wavelength band.

9. The optical module according to claim 8, characterized in that, The first band and the second band are any two of the following bands: O band, E band, S band, C band, L band, U band.

10. The optical module according to any one of claims 1 to 9, characterized in that, The detection unit is configured to determine that a communication link where the optical module is located fails when detecting an interruption of the input optical signal. The detection unit is further configured to receive an interaction instruction after sending the first switching instruction, where the interaction instruction is used to indicate that the fault has been eliminated, and the detection unit is further configured to send a second switching instruction to the electrical port according to the interaction instruction. The non-mechanical optical switch is configured to switch the input port connected to the output port from the second input port to the first input port according to the second switching instruction.

11. The optical module according to claim 4 or 5, characterized in that, The optical module is applied to a wavelength selective switch (WSS). The WSS includes a first optical communication line, a second optical communication line, a first add / drop node, and a second add / drop node. An optical signal of a first wavelength is transmitted from the first optical communication line to the first add / drop node, and an optical signal of a second wavelength is transmitted from the second optical communication line to the second add / drop node. The optical module further includes a second component, and the structure of the second component is the same as that of the first component. The input port of the optical splitter in the first component is connected to the first optical communication line, and the output port of the non-mechanical optical switch in the first component is used to be connected to the first add / drop node, and the first add / drop node is configured to implement adding / dropping of the first wavelength signal. The input port of the optical splitter in the second component is connected to the second optical communication line, and the output port of the non-mechanical optical switch in the second component is used to be connected to the second add / drop node, and the second add / drop node is configured to implement adding / dropping of the second wavelength signal; the wavelength of the second wavelength signal is different from that of the first wavelength signal.

12. The optical module according to claim 11, wherein, The switching time for the first communication line in the WSS to implement adding / dropping is T, the switching time for the second communication line in the WSS to implement adding / dropping is T, and the allowable switching time for the adding / dropping scenario is T', and T ≤ T'.

13. The optical module according to claim 12, wherein, The first wavelength signal and the second wavelength signal are signals with different wavelengths in any one of the following bands: O band, E band, S band, C band, L band, U band.

14. The optical module according to any one of claims 11 to 13, wherein, The detection unit is further configured to send a second switching instruction to the electrical port when detecting the input optical signal. The non-mechanical optical switch is configured to switch the input port connected to the output port from the second input port to the first input port according to the second switching instruction.

15. An optical communication device, wherein, It includes a first optical amplifier, a second optical amplifier, a first optical module, and a second optical module, and the first optical module and the second optical module are the optical modules according to any one of claims 1 to 14. The first optical module is connected to the first optical amplifier, and the first optical amplifier is configured to amplify an optical signal of a first band and transmit it to the first optical module. The second optical module is connected to the second optical amplifier, and the second optical amplifier is configured to amplify an optical signal of a second band and transmit it to the second optical module, and the second band is different from the first band.

16. The optical communication device according to claim 15, wherein, The first band and the second band are any two of the following bands: O band, E band, S band, C band, L band, U band.

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