Optical transmission equipment and optical network

Abstract

The invention provides optical transmission equipment and an optical network, relates to the field of optical communication, and can improve the transmission quality of the optical network. The optical transmission equipment comprises a first OLP circuit, a second OLP circuit and a control circuit, the first OLP circuit and the second OLP circuit are both used for being connected with a working optical fiber line through the first interface circuit, and the first OLP circuit and the second OLP circuit are also used for being connected with a protection optical fiber line through the second interface circuit; wherein the first OLP circuit and the second OLP circuit are connected with the control circuit; the control circuit is used for controlling the first OLP circuit to receive the optical signal of the first wave band from the working optical fiber line and to switch to receive the optical signal of the first wave band from the protection optical fiber line, and controlling the second OLP circuit to receive the optical signal of the second wave band from the working optical fiber line and to switch to receive the optical signal of the second wave band from the protection optical fiber line; the first wavelength band and the second wavelength band have different wavelength ranges. The embodiment of the invention is applied to the field of optical communication.

Description

Technical Field

[0001] This application relates to the field of optical communication, and particularly to an optical transmission device and an optical network. Background Art

[0002] Optical communication is a communication method using light waves as the transmission medium, which has advantages such as large communication capacity and strong anti-interference ability. However, during the process of transmitting signals in an optical communication network (also known as an optical network), it frequently faces the problem of transmission interruption caused by fiber optic line failures, seriously affecting the transmission quality of the optical communication network.

[0003] Based on this problem, optical multiplex section protection (OMSP) technology is usually adopted. Through an optical line protection (OLP) device, it is ensured that the optical communication network can transmit signals normally. Specifically, two optical signals are transmitted to the OLP device through two ("1 + 1", that is, "main path + backup path", also known as "working path + protection path") fiber optic lines. Through the OLP device, the better-quality one of the two optical signals can be selected for reception (also known as "switching"), thereby realizing the backup of the optical signal. Usually, when a certain fiber optic line for transmitting optical signals in the C (compromise, generally shorter wavelength) band fails, the optical signal in the C band will be switched; when the fiber optic line for the optical signal in the L (long wave, generally longer wavelength) band fails, the optical signal in the L band will be switched. With the continuous development of optical communication-related technologies, the optical signals transmitted in the optical communication network are no longer limited to only transmitting optical signals in the C band, but also need to transmit optical signals in the L band at the same time, that is, the transmitted optical signals gradually evolve into C + L band optical signals (including optical signals in the C band and optical signals in the L band). And the switching mechanism for the transmission of optical signals in different bands will also affect the transmission quality of the optical communication network. Summary of the Invention

[0004] This application provides an optical transmission device and an optical network, which can realize the linkage switching of optical signals in two different bands, thereby improving the transmission quality of the optical communication network.

[0005] In a first aspect, an optical transmission device is provided. The optical transmission device includes: a first OLP circuit, a second OLP circuit, and a control circuit; the first OLP circuit is configured to connect to a working optical fiber line through a first interface circuit, and the first OLP circuit is further configured to connect to a protection optical fiber line through a second interface circuit; the second OLP circuit is configured to connect to the working optical fiber line through the first interface circuit, and the second OLP circuit is further configured to connect to the protection optical fiber line through the second interface circuit; wherein, the first OLP circuit and the second OLP circuit are connected to the control circuit; the control circuit is configured to control the first OLP circuit to switch from receiving an optical signal in a first band from the working optical fiber line to receiving the optical signal in the first band from the protection optical fiber line, and control the second OLP circuit to switch from receiving an optical signal in a second band from the working optical fiber line to receiving the optical signal in the second band from the protection optical fiber line, and the first band and the second band have different wavelength ranges.

[0006] Then, in the above solution, two OLP circuits (i.e., the first OLP circuit and the second OLP circuit) can both receive two optical signals transmitted by two optical fiber lines (i.e., the working optical fiber line and the protection optical fiber line) through the interface circuit, and the two optical signals respectively belong to two different bands. Among them, the first OLP circuit is used to receive the optical signal in the first band, and the second OLP circuit is used to receive the optical signal in the second band. Specifically, through the control circuit in the above solution, it can control the first OLP circuit to switch from receiving the optical signal in the first band from the working optical fiber line to receiving the optical signal in the first band from the protection optical fiber line; at the same time, the control circuit can also control the second OLP circuit to switch from receiving the optical signal in the second band from the working optical fiber line to receiving the optical signal in the second band from the protection optical fiber line. In a possible implementation manner, the first band is the C band and the second band is the L band, then the optical signals transmitted by the two optical fiber lines both include the optical signals in the C+L band, wherein the first OLP circuit is used to receive the optical signal in the C band, and the second OLP circuit is used to receive the optical signal in the L band. For example, when a fault occurs during the transmission of the optical signal in the C band along the working optical fiber transmission line, the control circuit can control the first OLP circuit to perform a switchover on the optical signal in the C band, that is, switch to receiving the optical signal in the C band from the protection optical fiber line to ensure the normal transmission of the optical signal in the C band. At the same time, the control circuit can also control the second OLP circuit to perform a switchover on the optical signal in the L band, that is, switch to receiving the optical signal in the L band from the protection optical fiber line, so as to ensure the normal transmission of the optical signal in the L band. In this way, through the above solution, the optical signal in the C band and the optical signal in the L band can achieve a linkage switchover. Then, the above solution enables the optical signals in two different bands to achieve a linkage switchover, thereby effectively improving the transmission quality of the optical communication network.

[0007] In a possible implementation, the control circuit is further configured to receive a first detection result sent by the first OLP circuit based on the working optical fiber line and the protection optical fiber line. The first detection result is used to indicate that the optical signal in the first band is abnormally transmitted along the working optical fiber line, and the optical signal in the first band is normally transmitted along the protection optical fiber line. Specifically, the control circuit is configured to control the first OLP circuit to receive the optical signal in the first band from the protection optical fiber line based on the first detection result.

[0008] Then, in the above solution, the first OLP circuit can send a detection result to the control circuit based on two optical fiber lines. Among them, the first OLP circuit can receive two optical signals from two optical fiber lines (i.e., the working optical fiber line and the protection optical fiber line), and the two optical signals belong to the same band (i.e., the first band). Specifically, based on the first detection result, the control circuit can determine that the optical signal in the first band is abnormally transmitted along the working optical fiber line, and the optical signal in the first band is normally transmitted along the protection optical fiber line. Further, based on the detection result, the control circuit controls the first OLP circuit to switch the optical signal in the first band. Usually, the OLP circuit switching includes: based on the two received optical signals, determining the detection result by determining the quality (such as optical power) of the two optical signals, and finally selecting to receive the optical signal with better quality among the two optical signals. Exemplarily, according to the received first detection result, the control circuit can determine that the quality of the optical signal in the first band transmitted along the working optical fiber line is poor, and the quality of the optical signal in the first band transmitted along the protection optical fiber line is good; and then control the first OLP circuit to switch, and switch to select to receive the optical signal with better quality, that is, receive the optical signal in the first band from the protection optical fiber line. Then, the above solution can control the switching of the optical signal in the corresponding band (the first band) based on the detection result sent by the first OLP circuit to ensure the transmission quality of the optical signal in this band.

[0009] In a possible implementation, the control circuit is further configured to receive a second detection result sent by the first OLP circuit based on the working optical fiber line and the protection optical fiber line. The second detection result is used to indicate that the optical signal in the first band is abnormally transmitted along the working optical fiber line, and the optical signal in the first band is abnormally transmitted along the protection optical fiber line. Specifically, the control circuit is configured to control the first OLP circuit to receive the optical signal in the first band from the working optical fiber line based on the second detection result.

[0010] Then, in the above solution, the first OLP circuit can send the detection result to the control circuit based on two optical fiber lines (i.e., the working optical fiber line and the protection optical fiber line), where the two optical signals belong to the same wavelength band (i.e., the first wavelength band). Specifically, based on the second detection result, the control circuit can determine that the optical signal in the first wavelength band is abnormally transmitted along the working optical fiber line, and the optical signal in the first wavelength band is abnormally transmitted along the protection optical fiber line. Further, based on this detection result, the control circuit controls the first OLP circuit not to perform switching. Specifically, according to the received second detection result, the control circuit can determine that the quality of the optical signal in the first wavelength band transmitted along the working optical fiber line is poor, and the quality of the optical signal in the first wavelength band transmitted along the protection optical fiber line is also poor; and then control the first OLP circuit not to perform switching, that is, continue to receive the optical signal in the first wavelength band from the working optical fiber line. Then, the above solution can control the optical signal in the corresponding wavelength band (the first wavelength band) not to perform switching based on the detection result sent by the first OLP circuit.

[0011] In a possible implementation manner, the control circuit is further configured to receive a third detection result sent by the second OLP circuit based on the working optical fiber line and the protection optical fiber line, where the third detection result is used to indicate that the optical signal in the second wavelength band is normally transmitted along the working optical fiber line, and the optical signal in the second wavelength band is normally transmitted along the protection optical fiber line; the control circuit is further configured to control the second OLP circuit to receive the optical signal in the second wavelength band from the protection optical fiber line in response to the third detection result.

[0012] Then, in the above solution, the second OLP circuit can send the detection result to the control circuit based on two optical fiber lines. Among them, the second OLP circuit can receive two optical signals from two optical fiber lines (i.e., the working optical fiber line and the protection optical fiber line) respectively, and the two optical signals belong to the same wavelength band (i.e., the second wavelength band). Specifically, based on the third detection result, the control circuit can determine that the optical signal of the second wavelength band is transmitted normally along the working optical fiber line, and the optical signal of the second wavelength band is transmitted normally along the protection optical fiber line. Further, based on the third detection result, the control circuit controls the second OLP circuit to perform a switch, and switches to receive the optical signal of the second wavelength band from the protection optical fiber line. Exemplarily, if the first wavelength band is the C band and the second wavelength band is the L band, the optical signals transmitted along the working optical fiber line and the protection optical fiber line both include the optical signals of the C+L band. Generally, stimulated Raman scattering (SRS) will occur when the optical signal is transmitted along the optical fiber, so the SRS effect will appear during the transmission process. This means that the energy of the optical signal with a short wavelength will transfer to the optical signal with a long wavelength, resulting in the attenuation of the energy of the optical signal with a short wavelength and the enhancement of the energy of the optical signal with a long wavelength. In a possible implementation manner, the control circuit has controlled the first OLP circuit to perform a switch, that is, the first OLP circuit switches to receive the optical signal of the C band from the protection optical fiber line. In this way, due to the SRS effect during the transmission process, the transmission of the optical signal of the C band is abnormal, which will cause the energy of the optical signal of the C band not to transfer to the optical signal of the L band, and the transmission quality of the optical signal of the L band is affected, and the optical signal of the L band needs to be switched in a linked manner. However, since the third detection result indicates that the optical signal of the L band is transmitted normally along the two optical fiber lines, the second OLP circuit will continue to receive the optical signal of the L band from the working optical fiber line and will not perform a linked switch on the optical signal of the L band, which will result in a poor transmission quality of the optical transmission network. Based on the above solution, the control circuit can control the first OLP circuit to switch the optical signal of the C band; at the same time, it can also control the second OLP circuit to receive the optical signal of the L band from the protection optical fiber line based on the third detection result, and realize a linked switch on the optical signal of the L band. Then, the above solution can realize the linked switch of the optical signals of two different wavelength bands, thus ensuring the transmission effect of the optical transmission network.

[0013] In a possible implementation manner, the control circuit is further configured to receive a fourth detection result sent by the second OLP circuit based on the working optical fiber line and the protection optical fiber line, where the fourth detection result is used to indicate that the optical signal of the second wavelength band is transmitted normally along the working optical fiber line, and the optical signal of the second wavelength band is transmitted abnormally along the protection optical fiber line; the control circuit is further configured to control the second OLP circuit to receive the optical signal of the second wavelength band from the working optical fiber line in response to the fourth detection result.

[0014] Then, the second OLP circuit can send the fourth detection result to the control circuit based on two optical fiber lines. Among them, the second OLP circuit can receive two optical signals from two optical fiber lines (i.e., the working optical fiber line and the protection optical fiber line) respectively, and the two optical signals belong to the same wavelength band (i.e., the second wavelength band). Specifically, based on the fourth detection result, the control circuit can determine that the optical signal of the second wavelength band is transmitted normally along the working optical fiber line, and the optical signal of the second wavelength band is transmitted abnormally along the protection optical fiber line. Based on the above solution, in some examples, the control circuit has controlled the first OLP circuit to complete the switching of the optical signal of the first wavelength band. Of course, the first OLP circuit can also not switch the optical signal of the first wavelength band. In this way, the above solution can, based on the detection result, control the second OLP circuit to adaptively not switch the optical signal of the second wavelength band and continue to receive the optical signal of the second wavelength band from the working optical fiber line. Then, the above solution can, through the control circuit, switch the optical signal of one wavelength band based on the detection result and not switch the optical signal of another wavelength band to ensure the transmission quality of the optical communication network.

[0015] In a possible implementation, the control circuit is further configured to receive the fifth detection result sent by the second OLP circuit based on the working optical fiber line and the protection optical fiber line, where the fifth detection result is used to indicate that the optical signal of the second wavelength band is transmitted normally along the working optical fiber line and the optical signal of the second wavelength band is transmitted normally along the protection optical fiber line; the control circuit is further configured to, in response to the fifth detection result, control the second OLP circuit to receive the optical signal of the second wavelength band from the working optical fiber line.

[0016] Then, in the above solution, the second OLP circuit can send the fifth detection result to the control circuit based on two optical fiber lines. Among them, the second OLP circuit can receive two optical signals from two optical fiber lines (i.e., the working optical fiber line and the protection optical fiber line) respectively, and the two optical signals belong to the same wavelength band (i.e., the second wavelength band). Specifically, based on the fifth detection result, the control circuit can determine that the optical signal of the second wavelength band is transmitted normally along the working optical fiber line and the optical signal of the second wavelength band is transmitted normally along the protection optical fiber line. In a possible implementation, the control circuit has controlled the first OLP circuit not to switch the optical signal of the first wavelength band. In this way, the above solution can, based on the detection result, control the second OLP circuit to adaptively not switch the optical signal of the second wavelength band and continue to receive the optical signal of the second wavelength band from the working optical fiber line. Then, the above solution can, through the control circuit, not switch the optical signal of one wavelength band based on the detection result and also not switch the optical signal of another wavelength band.

[0017] In a possible implementation, the control circuit is further configured to receive a sixth detection result sent by the second OLP circuit based on the working optical fiber line and the protection optical fiber line. The sixth detection result is used to indicate that the optical signal in the second band is abnormally transmitted along the working optical fiber line, and the optical signal in the second band is normally transmitted along the protection optical fiber line. The control circuit is further configured to control the second OLP circuit to receive the optical signal in the second band from the protection optical fiber line in response to the sixth detection result.

[0018] Then, in the above solution, the second OLP circuit can send the sixth detection result to the control circuit based on the two optical fiber lines, so that the control circuit can determine, based on the sixth detection result, that the optical signal in the second band is abnormally transmitted along the working optical fiber line, and the optical signal in the second band is normally transmitted along the protection optical fiber line. Further, based on this detection result, the control circuit controls the second OLP circuit to switch the optical signal in the second band. Specifically, according to the received sixth detection result, the control circuit can determine that the quality of the optical signal in the second band transmitted along the working optical fiber line is poor, and the quality of the optical signal in the second band transmitted along the protection optical fiber line is good. Then, the control circuit controls the second OLP circuit to perform a switch and switch to select the optical signal with better quality, that is, to receive the optical signal in the second band from the protection optical fiber line. Therefore, the above solution can control the switching of the optical signal in the corresponding band (the second band) based on the detection result sent by the second OLP circuit to ensure the transmission quality of the optical signal in this band.

[0019] In a possible implementation, the control circuit is further configured to receive a seventh detection result sent by the second OLP circuit based on the working optical fiber line and the protection optical fiber line. The seventh detection result is used to indicate that the optical signal in the second band is abnormally transmitted along the working optical fiber line, and the optical signal in the second band is abnormally transmitted along the protection optical fiber line. The control circuit is further configured to control the second OLP circuit to receive the optical signal in the second band from the working optical fiber line in response to the seventh detection result.

[0020] Then, in the above solution, the second OLP circuit can send the seventh detection result to the control circuit based on two optical fiber lines, enabling the control circuit to determine, based on the seventh detection result, that the optical signal in the second band is abnormally transmitted along the working optical fiber line and the optical signal in the second band is abnormally transmitted along the protection optical fiber line. Further, based on this detection result, the control circuit controls the second OLP circuit not to switch the optical signal in the second band. Specifically, according to the received seventh detection result, the control circuit can determine that the quality of the optical signal in the second band transmitted along the working optical fiber line is poor, and the quality of the optical signal in the second band transmitted along the protection optical fiber line is also poor; and then controls the second OLP circuit not to perform switching and continue to receive the optical signal in the second band from the working optical fiber line. Then, the above solution can control the optical signal in the corresponding band (the second band) not to be switched based on the detection result sent by the second OLP circuit.

[0021] In a possible implementation, the control circuit is further configured to receive the eighth detection result sent by the first OLP circuit based on the working optical fiber line and the protection optical fiber line, where the eighth detection result is used to indicate that the optical signal in the first band is normally transmitted along the working optical fiber line and the optical signal in the first band is normally transmitted along the protection optical fiber line; specifically, the control circuit is configured to control the first OLP circuit to receive the optical signal in the first band from the protection optical fiber line based on the eighth detection result.

[0022] Then, in the above solution, the first OLP circuit can send the eighth detection result to the control circuit based on two optical fiber lines. Among them, the second OLP circuit can receive two optical signals from two optical fiber lines (i.e., the working optical fiber line and the protection optical fiber line), and the two optical signals belong to the same band (i.e., the first band). Specifically, based on the eighth detection result, the control circuit can determine that the optical signal in the first band is normally transmitted along the working optical fiber line and the optical signal in the first band is normally transmitted along the protection optical fiber line. Further, based on the eighth detection result, the control circuit controls the first OLP circuit to perform switching and switch to receive the optical signal in the first band from the protection optical fiber line. In a possible implementation, the first band is the C band and the second band is the L band, and the optical signals transmitted along the working optical fiber line and the protection optical fiber line both include optical signals in the C + L band. In this way, based on the above solution, the control circuit can control the second OLP circuit to switch the optical signal in the L band; at the same time, it can also control the first OLP circuit to receive the optical signal in the C band from the protection optical fiber line based on the eighth detection result and implement a linkage switch for the optical signal in the C band, so as to achieve the linkage switch for optical signals in two different bands.

[0023] In a possible implementation, the control circuit is further configured to receive a ninth detection result sent by the first OLP circuit based on the working optical fiber line and the protection optical fiber line. The ninth detection result is used to indicate that the optical signal in the first band is transmitted normally along the working optical fiber line, and the optical signal in the first band is transmitted abnormally along the protection optical fiber line. Specifically, the control circuit is configured to control the first OLP circuit to receive the optical signal in the first band from the working optical fiber line based on the ninth detection result.

[0024] Then, in the above solution, the first OLP circuit can send the ninth detection result to the control circuit based on the two optical fiber lines. Among them, the second OLP circuit can receive two optical signals from the two optical fiber lines (i.e., the working optical fiber line and the protection optical fiber line), and the two optical signals belong to the same band (i.e., the first band). Specifically, based on the ninth detection result, the control circuit can determine that the optical signal in the first band is transmitted normally along the working optical fiber line, and the optical signal in the first band is transmitted abnormally along the protection optical fiber line. Further, based on the ninth detection result, the control circuit controls the first OLP circuit not to perform switching and continues to receive the optical signal in the first band from the working optical fiber line. In a possible implementation, the first band is the C band, the second band is the L band, and the optical signals transmitted along the working optical fiber line and the protection optical fiber line both include the optical signals in the C + L band. In this way, based on the above solution, the control circuit can control the second OLP circuit to perform switching on the optical signal in the L band; at the same time, it can also control the first OLP circuit to continue to receive the optical signal in the C band from the working optical fiber line based on the ninth detection result and not perform linkage switching on the optical signal in the C band.

[0025] In a possible implementation, the control circuit is further configured to receive a tenth detection result sent by the first OLP circuit based on the working optical fiber line and the protection optical fiber line. The tenth detection result is used to indicate that the optical signal in the first band is transmitted normally along the working optical fiber line, and the optical signal in the first band is transmitted normally along the protection optical fiber line. Specifically, the control circuit is configured to control the first OLP circuit to receive the optical signal in the first band from the working optical fiber line based on the tenth detection result.

[0026] Then, in the above solution, the first OLP circuit can send the tenth detection result to the control circuit based on two optical fiber lines. Among them, the second OLP circuit can receive two optical signals from two optical fiber lines (i.e., the working optical fiber line and the protection optical fiber line) respectively, and the two optical signals belong to the same wavelength band (i.e., the first wavelength band). Specifically, based on the tenth detection result, the control circuit can determine that the optical signal in the first wavelength band is transmitted normally along the working optical fiber line, and the optical signal in the first wavelength band is transmitted normally along the protection optical fiber line. Further, based on the tenth detection result, the control circuit controls the first OLP circuit not to perform switching and continues to receive the optical signal in the first wavelength band from the working optical fiber line. In a possible implementation manner, the first wavelength band is the C band, the second wavelength band is the L band, and the optical signals transmitted along the working optical fiber line and the protection optical fiber line both include the optical signals in the C+L band. In this way, based on the above solution, the control circuit can control the second OLP circuit to perform switching on the optical signal in the L band; at the same time, it can also control the first OLP circuit to continue to receive the optical signal in the C band from the working optical fiber line based on the tenth detection result and not perform linkage switching on the optical signal in the C band.

[0027] In a possible implementation manner, the control circuit is further configured to receive the eleventh detection result sent by the first OLP circuit based on the working optical fiber line and the protection optical fiber line, and the eleventh detection result is used to indicate that the optical signal in the first wavelength band is transmitted normally along the working optical fiber line, and the optical signal in the first wavelength band is transmitted normally along the protection optical fiber line; specifically, the control circuit is configured to control the first OLP circuit to receive the optical signal in the first wavelength band from the working optical fiber line based on the eleventh detection result.

[0028] Then, in the above solution, the first OLP circuit can send the eleventh detection result to the control circuit based on two optical fiber lines (i.e., the working optical fiber line and the protection optical fiber line), and the two optical signals belong to the same wavelength band (i.e., the first wavelength band). Among them, based on the eleventh detection result, the control circuit can determine that the optical signal in the first wavelength band is transmitted normally along both the working optical fiber line and the protection optical fiber line. Specifically, based on this detection result, the control circuit will control the first OLP circuit to receive the optical signal in the first wavelength band from the working optical fiber line. In a possible implementation manner, at the first moment, the optical signal in the first wavelength band is transmitted abnormally along the working optical fiber line and normally along the protection optical fiber line, and the first OLP circuit switches to receive the optical signal in the first wavelength band from the protection optical fiber line. At the second moment, based on the eleventh detection result, the control circuit determines that the transmission of the optical signal in the first wavelength band along the working optical fiber line is (restored) normal, and will control the first OLP circuit to be restored to receive the optical signal in the first wavelength band from the working optical fiber line. Based on the above solution, the control circuit can control the first OLP circuit to realize the line restoration of the optical signal in the corresponding wavelength band (the first wavelength band) based on the transmission situation of the optical fiber line indicated by the detection result, so as to ensure the transmission effect of the optical signal.

[0029] In a possible implementation, the control circuit is further configured to receive a twelfth detection result sent by the first OLP circuit based on the working optical fiber line and the protection optical fiber line. The twelfth detection result is used to indicate that the optical signal in the first band is transmitted normally along the working optical fiber line, and the optical signal in the first band is transmitted abnormally along the protection optical fiber line. Specifically, the control circuit is configured to control the first OLP circuit to receive the optical signal in the first band from the working optical fiber line based on the twelfth detection result.

[0030] Then, in the above solution, the first OLP circuit can send the twelfth detection result to the control circuit based on two optical fiber lines (i.e., the working optical fiber line and the protection optical fiber line), and the two optical signals belong to the same band (i.e., the first band). Among them, based on the twelfth detection result, the control circuit can determine that the optical signal in the first band is transmitted normally along the working optical fiber line, and the optical signal in the first band is transmitted abnormally along the protection optical fiber line. Specifically, based on this detection result, the control circuit will control the first OLP circuit to receive the optical signal in the first band from the working optical fiber line. In a possible implementation, at the first moment, the optical signal in the first band is transmitted abnormally along the working optical fiber line and normally along the protection optical fiber line. Therefore, the first OLP circuit receives the optical signal in the first band from the protection optical fiber line. At the second moment, based on the twelfth detection result, the control circuit determines that the transmission (recovery) of the optical signal in the first band along the working optical fiber line is normal, and will control the first OLP circuit to resume receiving the optical signal in the first band from the working optical fiber line. Based on the above solution, the control circuit can control the first OLP circuit to realize the line recovery of the optical signal in the corresponding band (the first band) based on the detection result, so as to ensure the transmission effect of the optical signal.

[0031] In a possible implementation, the control circuit is further configured to receive a thirteenth detection result sent by the second OLP circuit based on the working optical fiber line and the protection optical fiber line. The thirteenth detection result is used to indicate that the optical signal in the second band is transmitted normally along the working optical fiber line, and the optical signal in the second band is transmitted normally along the protection optical fiber line. The control circuit is further configured to control the second OLP circuit to receive the optical signal in the second band from the working optical fiber line in response to the thirteenth detection result.

[0032] Then, in the above solution, the second OLP circuit can send the thirteenth detection result to the control circuit based on two optical fiber lines (i.e., the working optical fiber line and the protection optical fiber line), and the two optical signals belong to the same wavelength band (i.e., the second wavelength band). Among them, based on the thirteenth detection result, the control circuit can determine that the transmission of the optical signal in the second wavelength band along the working optical fiber line and the protection optical fiber line is normal. Specifically, based on this detection result, the control circuit will control the second OLP circuit to receive the optical signal in the second wavelength band from the working optical fiber line. In a possible implementation, at the first moment, the optical signals in the first wavelength band and the second wavelength band are abnormally transmitted along the working optical fiber line and normally transmitted along the protection optical fiber line. Therefore, the first OLP circuit receives the optical signal in the first wavelength band from the protection optical fiber line, and the second OLP circuit receives the optical signal in the second wavelength band from the protection optical fiber line. At the second moment, the transmission of the optical signal in the first wavelength band along the working optical fiber line and the protection optical fiber line is normal, and the control circuit controls the first OLP circuit to resume receiving the optical signal in the first wavelength band from the working optical fiber line; at the same time, since the control circuit determines that the transmission (recovery) of the optical signal in the second wavelength band along the working optical fiber line is normal based on the thirteenth detection result, it will control the second OLP circuit to resume receiving the optical signal in the second wavelength band from the working optical fiber line. Based on the above solution, the control circuit can control the second OLP circuit to achieve the linkage recovery of the optical signal in another wavelength band (the second wavelength band) based on the line recovery of the optical signal in a certain wavelength band (the first wavelength band) by the first OLP circuit, effectively improving the transmission efficiency of the optical communication network.

[0033] In a possible implementation, the control circuit is further configured to receive the fourteenth detection result sent by the second OLP circuit based on the working optical fiber line and the protection optical fiber line, where the fourteenth detection result is used to indicate that the optical signal in the second wavelength band is abnormally transmitted along the working optical fiber line and the optical signal in the second wavelength band is normally transmitted along the protection optical fiber line; the control circuit is further configured to control the second OLP circuit to receive the optical signal in the second wavelength band from the protection optical fiber line in response to the fourteenth detection result.

[0034] Then, in the above solution, the second OLP circuit can send the fourteenth detection result to the control circuit based on two optical fiber lines (i.e., the working optical fiber line and the protection optical fiber line), and the two optical signals belong to the same wavelength band (i.e., the second wavelength band). Among them, based on the fourteenth detection result, the control circuit can determine that the optical signal in the second wavelength band is abnormally transmitted along the working optical fiber line and is normally transmitted along the protection optical fiber line. Specifically, based on this detection result, the control circuit will control the second OLP circuit to receive the optical signal in the second wavelength band from the working optical fiber line. In a possible implementation, at the first moment, the optical signals in the first wavelength band and the second wavelength band are abnormally transmitted along the working optical fiber line and are normally transmitted along the protection optical fiber line. Therefore, the first OLP circuit receives the optical signal in the first wavelength band from the protection optical fiber line, and the second OLP circuit receives the optical signal in the second wavelength band from the protection optical fiber line. At the second moment, the transmission of the optical signal in the first wavelength band along the working optical fiber line and the protection optical fiber line is normal, and the control circuit controls the first OLP circuit to resume receiving the optical signal in the first wavelength band from the working optical fiber line; at the same time, since the control circuit determines based on the fourteenth detection result that the transmission of the optical signal in the second wavelength band along the working optical fiber line is abnormal (not restored to normal), it will control the second OLP circuit to continue to receive the optical signal in the second wavelength band from the protection optical fiber line. Based on the above solution, the control circuit can control the first OLP circuit to achieve line restoration for the optical signal in a certain wavelength band (the first wavelength band) based on the transmission condition of the optical fiber line, and control the second OLP circuit not to perform linkage restoration for the optical signal in another wavelength band (the second wavelength band).

[0035] In a possible implementation, the control circuit is further configured to receive the fifteenth detection result sent by the second OLP circuit based on the working optical fiber line and the protection optical fiber line, where the fifteenth detection result is used to indicate that the optical signal in the second wavelength band is abnormally transmitted along the working optical fiber line and the optical signal in the second wavelength band is abnormally transmitted along the protection optical fiber line; the control circuit is further configured to control the second OLP circuit to receive the optical signal in the second wavelength band from the protection optical fiber line in response to the fifteenth detection result.

[0036] Then, in the above solution, the second OLP circuit can send the fifteenth detection result to the control circuit based on two optical fiber lines (i.e., the working optical fiber line and the protection optical fiber line), and the two optical signals belong to the same wavelength band (i.e., the second wavelength band). Among them, based on the fifteenth detection result, the control circuit can determine that the transmission of the optical signal in the second wavelength band along both the working optical fiber line and the protection optical fiber line is abnormal. Specifically, based on this detection result, the control circuit will control the second OLP circuit to receive the optical signal in the second wavelength band from the protection optical fiber line. In a possible implementation manner, at the first moment, the optical signal in the first wavelength band and the optical signal in the second wavelength band are abnormally transmitted along the working optical fiber line and are normally transmitted along the protection optical fiber line. Therefore, the first OLP circuit receives the optical signal in the first wavelength band from the protection optical fiber line, and the second OLP circuit receives the optical signal in the second wavelength band from the protection optical fiber line. At the second moment, the optical signal in the first wavelength band is normally transmitted along the working optical fiber line and is abnormally transmitted along the protection optical fiber line. The control circuit controls the first OLP circuit to resume receiving the optical signal in the first wavelength band from the working optical fiber line; at the same time, since the control circuit determines that the transmission of the optical signal in the second wavelength band along the working optical fiber line is abnormal (not restored to normal) based on the fifteenth detection result, it will control the second OLP circuit to continue receiving the optical signal in the second wavelength band from the protection optical fiber line. Based on the above solution, the control circuit can control the first OLP circuit to achieve line restoration for the optical signal in a certain wavelength band (the first wavelength band) based on the transmission conditions of the optical fiber lines, and control the second OLP circuit not to perform linkage restoration for the optical signal in another wavelength band (the second wavelength band).

[0037] In a possible implementation manner, the control circuit is further configured to receive the sixteenth detection result sent by the second OLP circuit based on the working optical fiber line and the protection optical fiber line. The sixteenth detection result is used to indicate that the optical signal in the second wavelength band is normally transmitted along the working optical fiber line and the optical signal in the second wavelength band is normally transmitted along the protection optical fiber line; the control circuit is further configured to control the second OLP circuit to receive the optical signal in the second wavelength band from the working optical fiber line in response to the sixteenth detection result.

[0038] Then, in the above solution, the second OLP circuit can send the sixteenth detection result to the control circuit based on two optical fiber lines (i.e., the working optical fiber line and the protection optical fiber line), and the two optical signals belong to the same wavelength band (i.e., the second wavelength band). Among them, based on the sixteenth detection result, the control circuit can determine that the optical signals in the second wavelength band are transmitted normally along both the working optical fiber line and the protection optical fiber line. Specifically, based on this detection result, the control circuit will control the second OLP circuit to receive the optical signals in the second wavelength band from the working optical fiber line. In a possible implementation, at the first moment, the optical signals in the second wavelength band are abnormally transmitted along the working optical fiber line and normally transmitted along the protection optical fiber line, and the second OLP circuit switches to receiving the optical signals in the second wavelength band from the protection optical fiber line. At the second moment, based on the sixteenth detection result, the control circuit determines that the transmission of the optical signals in the second wavelength band along the working optical fiber line is (restored) normal, and will control the second OLP circuit to resume receiving the optical signals in the second wavelength band from the working optical fiber line. Based on the above solution, the control circuit can control the second OLP circuit to achieve line restoration of the optical signals in the corresponding wavelength band (the second wavelength band) based on the transmission conditions of the optical fiber lines indicated by the detection results.

[0039] In a possible implementation, the control circuit is further configured to receive the seventeenth detection result sent by the second OLP circuit based on the working optical fiber line and the protection optical fiber line, where the seventeenth detection result is used to indicate that the optical signals in the second wavelength band are transmitted normally along the working optical fiber line and the optical signals in the second wavelength band are abnormally transmitted along the protection optical fiber line; the control circuit is further configured to control the second OLP circuit to receive the optical signals in the second wavelength band from the working optical fiber line in response to the seventeenth detection result.

[0040] Then, in the above solution, the second OLP circuit can send the seventeenth detection result to the control circuit based on two optical fiber lines (i.e., the working optical fiber line and the protection optical fiber line), and the two optical signals belong to the same wavelength band (i.e., the second wavelength band). Among them, based on the seventeenth detection result, the control circuit can determine that the optical signals in the second wavelength band are transmitted normally along the working optical fiber line and the optical signals in the first wavelength band are abnormally transmitted along the protection optical fiber line. Specifically, based on this detection result, the control circuit will control the second OLP circuit to receive the optical signals in the second wavelength band from the working optical fiber line. In a possible implementation, at the first moment, the optical signals in the second wavelength band are abnormally transmitted along the working optical fiber line and normally transmitted along the protection optical fiber line, so the second OLP circuit receives the optical signals in the second wavelength band from the protection optical fiber line. At the second moment, based on the seventeenth detection result, the control circuit determines that the transmission of the optical signals in the second wavelength band along the working optical fiber line is (restored) normal, and will control the second OLP circuit to resume receiving the optical signals in the second wavelength band from the working optical fiber line. Based on the above solution, the control circuit can control the second OLP circuit to achieve line restoration of the optical signals in the corresponding wavelength band (the second wavelength band) based on the detection result.

[0041] In a possible implementation, the control circuit is further configured to receive an eighteenth detection result sent by the first OLP circuit based on the working optical fiber line and the protection optical fiber line. The eighteenth detection result is used to indicate that the optical signal in the first band is transmitted normally along the working optical fiber line, and the optical signal in the first band is transmitted normally along the protection optical fiber line. Specifically, the control circuit is configured to control the first OLP circuit to receive the optical signal in the first band from the working optical fiber line based on the eighteenth detection result.

[0042] Then, in the above solution, the first OLP circuit can send the eighteenth detection result to the control circuit based on two optical fiber lines (i.e., the working optical fiber line and the protection optical fiber line), and the two optical signals belong to the same band (i.e., the first band). Among them, based on the eighteenth detection result, the control circuit can determine that the transmission of the optical signal in the first band along the working optical fiber line and the protection optical fiber line is normal. Specifically, based on this detection result, the control circuit will control the first OLP circuit to receive the optical signal in the first band from the working optical fiber line. In a possible implementation, at the first moment, the optical signal in the first band and the optical signal in the second band are abnormally transmitted along the working optical fiber line and are normally transmitted along the protection optical fiber line. Therefore, the first OLP circuit receives the optical signal in the first band from the protection optical fiber line, and the second OLP circuit receives the optical signal in the second band from the protection optical fiber line. At the second moment, the transmission of the optical signal in the second band along the working optical fiber line and the protection optical fiber line is normal, and the control circuit controls the second OLP circuit to resume receiving the optical signal in the second band from the working optical fiber line. At the same time, since the control circuit determines that the transmission (recovery) of the optical signal in the first band along the working optical fiber line is normal based on the eighteenth detection result, it will control the first OLP circuit to resume receiving the optical signal in the first band from the working optical fiber line. Based on the above solution, the control circuit can control the second OLP circuit to perform line recovery on the optical signal in a certain band (the second band) based on the transmission condition of the optical fiber line, and control the first OLP circuit to realize the linkage recovery of the optical signal in another band (the first band).

[0043] In a possible implementation, the control circuit is further configured to receive a nineteenth detection result sent by the first OLP circuit based on the working optical fiber line and the protection optical fiber line. The nineteenth detection result is used to indicate that the optical signal in the first band is abnormally transmitted along the working optical fiber line, and the optical signal in the first band is normally transmitted along the protection optical fiber line. Specifically, the control circuit is configured to control the first OLP circuit to receive the optical signal in the first band from the protection optical fiber line based on the nineteenth detection result.

[0044] Then, in the above solution, the first OLP circuit can send the nineteenth detection result to the control circuit based on two optical fiber lines (i.e., the working optical fiber line and the protection optical fiber line), and the two optical signals belong to the same wavelength band (i.e., the first wavelength band). Among them, based on the nineteenth detection result, the control circuit can determine that the optical signal of the first wavelength band is abnormally transmitted along the working optical fiber line and is normally transmitted along the protection optical fiber line. Specifically, based on this detection result, the control circuit will control the first OLP circuit to receive the optical signal of the first wavelength band from the protection optical fiber line. In a possible implementation manner, at the first moment, the optical signal of the first wavelength band and the optical signal of the second wavelength band are abnormally transmitted along the working optical fiber line and are normally transmitted along the protection optical fiber line. Therefore, the first OLP circuit receives the optical signal of the first wavelength band from the protection optical fiber line, and the second OLP circuit receives the optical signal of the second wavelength band from the protection optical fiber line. At the second moment, the optical signal of the second wavelength band is normally transmitted along both the working optical fiber line and the protection optical fiber line. The control circuit controls the second OLP circuit to resume receiving the optical signal of the second wavelength band from the working optical fiber line; at the same time, since the control circuit determines based on the nineteenth detection result that the optical signal of the first wavelength band is abnormally transmitted (not recovered) along the working optical fiber line, it will control the first OLP circuit to continue receiving the optical signal of the first wavelength band from the protection optical fiber line. Based on the above solution, the control circuit can control the second OLP circuit to perform line recovery on the optical signal of a certain wavelength band (the second wavelength band) based on the transmission situation of the optical fiber line, and control the first OLP circuit not to perform linkage recovery on the optical signal of another wavelength band (the first wavelength band).

[0045] In a possible implementation manner, the control circuit is further configured to receive the twentieth detection result sent by the first OLP circuit based on the working optical fiber line and the protection optical fiber line. The twentieth detection result is used to indicate that the optical signal of the first wavelength band is abnormally transmitted along the working optical fiber line, and the optical signal of the first wavelength band is abnormally transmitted along the protection optical fiber line; specifically, the control circuit is configured to control the first OLP circuit to receive the optical signal of the first wavelength band from the protection optical fiber line based on the twentieth detection result.

[0046] Then, in the above solution, the first OLP circuit can send the twentieth detection result to the control circuit based on two optical fiber lines (i.e., the working optical fiber line and the protection optical fiber line), and the two optical signals belong to the same wavelength band (i.e., the first wavelength band). Among them, based on the twentieth detection result, the control circuit can determine that the transmission of the optical signal in the first wavelength band along both the working optical fiber line and the protection optical fiber line is abnormal. Specifically, based on this detection result, the control circuit will control the first OLP circuit to receive the optical signal in the first wavelength band from the protection optical fiber line. In a possible implementation, at the first moment, the optical signal in the first wavelength band and the optical signal in the second wavelength band are abnormally transmitted along the working optical fiber line and normally transmitted along the protection optical fiber line. Therefore, the first OLP circuit receives the optical signal in the first wavelength band from the protection optical fiber line, and the second OLP circuit receives the optical signal in the second wavelength band from the protection optical fiber line. At the second moment, the optical signal in the second wavelength band is normally transmitted along the working optical fiber line and abnormally transmitted along the protection optical fiber line. The control circuit controls the second OLP circuit to resume receiving the optical signal in the second wavelength band from the working optical fiber line; at the same time, since the control circuit determines that the transmission of the optical signal in the first wavelength band along the working optical fiber line is abnormal (not restored) based on the twentieth detection result, it will control the first OLP circuit to continue receiving the optical signal in the first wavelength band from the protection optical fiber line. Based on the above solution, the control circuit can control the second OLP circuit to perform line restoration on the optical signal in a certain wavelength band (the second wavelength band) based on the transmission condition of the optical fiber line, and control the first OLP circuit not to perform linkage restoration on the optical signal in another wavelength band (the first wavelength band).

[0047] In a possible implementation, the first wavelength band is: 1530 nm to 1565 nm; the second wavelength band is: 1565 nm to 1625 nm.

[0048] Then, in the above solution, the first wavelength band includes optical signals with wavelengths from 1530 nm to 1565 nm, and the second wavelength band includes optical signals with wavelengths from 1565 nm to 1625 nm. Based on the above solution, the first wavelength band can be the C band, and / or, the second wavelength band can be the L band. Of course, the above first wavelength band and second wavelength band can also be other possible corresponding wavelength bands, and the present application does not limit this.

[0049] In a second aspect, an optical network is provided. The optical network includes: at least one optical add-drop multiplexer, and an optical transmission device as described in any item of the first aspect connected to the optical add-drop multiplexer.

[0050] Among them, for the technical effects brought by the second aspect and any of its design methods, reference can be made to the technical effects brought by different design methods in the first aspect above, and details are not described here again. Description of the Drawings

[0051] Figure 1A schematic diagram of an optical communication network provided by an embodiment of the present application;

[0052] Figure 2 A schematic diagram of an optical communication network provided by another embodiment of the present application;

[0053] Figure 3 A schematic diagram of the change in optical power of an optical signal provided by an embodiment of the present application;

[0054] Figure 4 A distribution diagram of the optical power of an optical signal provided by an embodiment of the present application;

[0055] Figure 5 A schematic diagram of an optical communication network provided by yet another embodiment of the present application;

[0056] Figure 6 A schematic diagram of an optical transmission device provided by an embodiment of the present application. Detailed implementation manners

[0057] The present application will present various aspects, embodiments, or features around a system that may include multiple devices, components, modules, etc. It should be understood and appreciated that each system may include additional devices, components, modules, etc., and / or may not include all the devices, components, modules, etc. discussed in conjunction with the drawings. In addition, combinations of these solutions may also be used. It should be noted that in the embodiments of the present application, words such as "exemplary" or "for example" are used to represent examples, illustrations, or explanations. Any embodiment or design solution described as "exemplary" or "for example" in the embodiments of the present application should not be construed as being more preferred or having more advantages than other embodiments or design solutions. Rather, the use of words such as "exemplary" or "for example" is intended to present relevant concepts in a specific manner.

[0058] Next, the technical solutions in the embodiments of the present application will be described in conjunction with the drawings.

[0059] Exemplarily, referring to Figure 1 as shown, an embodiment of the present application provides a schematic diagram of an optical communication network. Combining Figure 1 as shown, the optical communication network includes: a multiplexer 101, a multiplexer 102, an OLP device 103, an OLP device 104, a plurality of fiber interface units (FIUs) (or referred to as fiber interface circuits, including Figure 1 8 FIUs in Figure 1 , namely FIU 105-1 to FIU 105-8), a plurality of amplifiers (including Figure 1The six adjustable attenuators in it, namely, adjustable attenuator 107-1 to adjustable attenuator 107-6).

[0060] Among them, multiplexer 101, OLP device 103, FIU 105-1, FIU 105-5, amplifier 106-1, amplifier 106-4, adjustable attenuator 107-1 and adjustable attenuator 107-4 are deployed at the sending end; multiplexer 102, OLP device 104, FIU 105-4, FIU 105-8, amplifier 106-3, amplifier 106-6, adjustable attenuator 107-3 and adjustable attenuator 107-6 are deployed at the receiving end. Combining Figure 1 As shown, all devices inside the sending end, optical fiber line and receiving end are connected by optical fibers, and optical signals are transmitted through the optical fiber line between the sending end and the receiving end. The optical fiber line is provided with: FIU 105-2, FIU 105-3, FIU 105-6, FIU 105-7, amplifier 106-2, amplifier 106-5, adjustable attenuator 107-2 and adjustable attenuator 107-5.

[0061] In this optical communication network, the optical signal output by the sending end is transmitted to the receiving end through the optical fiber line. Specifically, the sending end outputs an optical signal; the optical signal is transmitted along the optical fiber line and transmitted to the receiving end; the receiving end receives the optical signal. In order to ensure that the optical signal can be normally transmitted along the optical fiber line, multiple amplifiers can be deployed along the optical fiber line to perform multi-stage amplification on the optical signal, and at the same time, multiple adjustable attenuators can be deployed along the optical fiber line to adjust the optical signal amplified by the amplifier (for example, reduce the optical power of the optical signal).

[0062] However, during the transmission of the optical signal along the optical fiber line, it often faces the problem of transmission interruption caused by optical fiber line faults, which seriously affects the transmission quality of the optical communication network. The OLP technology has the characteristics of safety, reliability and fast fault recovery, and can solve the problem of transmission interruption caused by optical fiber line faults in an efficient and low-cost manner. By adopting the OLP technology, the protection of the optical fiber line can be realized and transmission interruption can be avoided.

[0063] Specifically, taking the downstream direction as an example, combining Figure 1 As shown, in this optical communication network:

[0064] At the transmitting end: The multiplexer 101 deployed at the transmitting end outputs an optical signal, and the OLP device 103 equally divides this optical signal into two optical signals; the two optical signals are respectively transmitted to the amplifiers 106-1 and 106-4 through two optical fibers; then the optical powers of the two optical signals are respectively reduced by the adjustable attenuators 107-1 and 107-4, and then transmitted to the FIU 105-1 and FIU 105-5 respectively; the two optical signals are respectively transmitted to the FIU 105-2 and FIU 105-6 of the optical fiber line through the FIU 105-1 and FIU 105-5 along the optical fiber.

[0065] In the optical fiber line: The two optical signals are respectively received by the FIU 105-2 and FIU 105-6; then the two optical signals are respectively amplified by the amplifiers 106-2 and 106-5; then the optical powers of the two optical signals are respectively reduced by the adjustable attenuators 107-2 and 107-5; the two optical signals are respectively output to the FIU 105-4 and FIU 105-8 of the receiving end through the FIU 105-3 and FIU 105-7 along the optical fiber.

[0066] At the receiving end: The two optical signals are respectively received by the FIU 105-4 and FIU 105-8; then the two optical signals are respectively amplified by the amplifiers 106-3 and 106-6; then the optical powers of the two optical signals are respectively reduced by the adjustable attenuators 107-3 and 107-6; the two optical signals are transmitted to the OLP device 104, and the OLP device 104 selects the optical signal with better quality among the two optical signals and outputs it to the multiplexer 102 for reception.

[0067] In a possible implementation, the OLP (such as the OLP device 104) can judge the quality of the optical signal according to the optical power of the optical signal (the higher the optical power, the better the quality of the optical signal), and judge the quality of the two received optical signals. Specifically, the OLP device 104 will select the optical signal with higher optical power (better quality) for reception according to the detected levels of the optical powers of the two optical signals.

[0068] In this way, the two optical signals output from the transmitting end can be transmitted to the receiving end through two optical fiber lines (for example, one main optical fiber line and one backup optical fiber line), and then the backup of the optical signal can be realized. Then, in the face of the problem of transmission interruption caused by a fault in the optical fiber line, the optical communication network adopting the OLP technology can perform a fast (for example, within 50 milliseconds (ms)) switch (that is, quickly select the optical signal transmitted by one of the two optical fiber lines for reception), so as to realize the protection of the optical fiber line of the optical signal.

[0069] With the continuous development of optical communication related technologies, the wavelength of optical signals transmitted in optical communication networks is gradually evolving towards the C+L band. Based on Figure 1 the architecture shown, exemplarily, referring to Figure 2 shown, an embodiment of the present application provides a schematic diagram of an optical communication network. Based on Figure 1 the architecture shown, in combination with Figure 2 shown, the optical communication network further includes: a multiplexer 201, a multiplexer 202, an OLP device 203, an OLP device 204, a plurality of optical fiber interface units ( Figure 2 4 FIU in Figure 2 , namely FIU 205-1 to FIU205-4), a plurality of amplifiers (including Figure 2 6 amplifiers in

[0070] , namely amplifier 206-1 to amplifier 206-6) and a plurality of adjustable attenuators (including Figure 2 6 adjustable attenuators in

[0071] , namely adjustable attenuator 207-1 to adjustable attenuator 207-6). Figure 2 Specifically, in combination with

[0072] At the transmitting end: The multiplexer 101 deployed at the transmitting end outputs an optical signal in the C band. An optical signal in the C band is divided into two optical signals through the OLP device 103. The two optical signals in the C band are respectively transmitted to the amplifiers 106-1 and 106-4. Then, the optical powers of the two optical signals are respectively reduced through the adjustable attenuators 107-1 and 107-4. The adjustable attenuator 107-1 transmits one of the optical signals in the C band to the FIU 105-1, and the adjustable attenuator 107-4 transmits the other optical signal in the C band to the FIU 205-1. Meanwhile, the multiplexer 201 deployed at the transmitting end outputs an optical signal in the L band. An optical signal in the L band is divided into two optical signals through the OLP device 203. The two optical signals in the L band are respectively transmitted to the amplifiers 206-1 and 206-4. Then, one of the optical signals in the L band is transmitted to the FIU 105-1 through the adjustable attenuator 207-1, and the optical power of the other optical signal in the L band is reduced and transmitted to the FIU 205-1 through the adjustable attenuator 207-4.

[0073] The FIU 105-1 combines the two received optical signals (the optical signal in the C band and the optical signal in the L band) into one optical signal and transmits it along the optical fiber to the FIU 105-2 in the first optical fiber line. The FIU 205-1 combines the two received optical signals (the optical signal in the C band and the optical signal in the L band) into one optical signal (the C+L band optical signal) along the optical fiber and transmits it to the FIU 205-2 in the second optical fiber line.

[0074] In the first optical fiber line: The two optical signals (the optical signal in the C band and the optical signal in the L band) are received by the FIU 105-2; then the two optical signals are respectively amplified by the amplifiers 106-2 and 106-5; then the optical powers of the two optical signals are respectively reduced through the adjustable attenuators 107-2 and 107-5; the two optical signals are output along the optical fiber through the FIU 105-3 to the receiving end (the FIU 105-4).

[0075] In the second optical fiber line: The two optical signals (the optical signal in the C band and the optical signal in the L band) are received by the FIU 205-2; then the two optical signals are respectively amplified by the amplifiers 106-2 and 106-5; then the optical powers of the two optical signals are respectively reduced through the adjustable attenuators 107-2 and 107-5; the two optical signals are output along the optical fiber through the FIU 205-3 to the receiving end (the FIU 205-4).

[0076] At the receiving end: In the first optical fiber line: FIU 105-4 divides the received optical signal into two optical signals (optical signal in the C band, optical signal in the L band), and transmits one of the optical signals to amplifier 106-3 (such as the optical signal in the C band), and transmits the other optical signal to amplifier 206-3 (such as the optical signal in the L band); amplifier 106-3 and amplifier 206-3 respectively amplify the two optical signals; then, the optical power of the two optical signals is reduced by variable optical attenuator 107-3 and variable optical attenuator 207-3 respectively; the two optical signals will be transmitted to OLP device 104 and OLP device 204 respectively. In the second optical fiber line: FIU 205-4 divides the received optical signal into two optical signals (optical signal in the C band, optical signal in the L band), and transmits one of the optical signals to amplifier 106-6 (such as the optical signal in the C band), and transmits the other optical signal to amplifier 206-6 (such as the optical signal in the L band); amplifier 106-6 and amplifier 206-6 respectively amplify the two optical signals; then, the optical power of the two optical signals is reduced by variable optical attenuator 107-6 and variable optical attenuator 207-6 respectively; in this way, the two optical signals in the C band will be transmitted to OLP device 104, and the two optical signals in the L band will be transmitted to OLP device 204.

[0077] Generally, when a fault occurs in a certain optical fiber transmission line for transmitting the optical signal in the C band (such as a fault in variable optical attenuator 107-1), the receiving end will perform a switchover of the optical signal in the C band; when a fault occurs in the optical fiber transmission line for the optical signal in the L band, the receiving end will perform a switchover of the optical signal in the L band. Specifically, OLP device 104 can select a better-quality optical signal from the two optical signals (such as the optical signal in the C band) for reception and output it to multiplexer 102 for reception. OLP device 204 can select a better-quality optical signal from the two optical signals (such as the optical signal in the L band) for reception and output it to multiplexer 202 for reception.

[0078] Based on the above, when the optical signal transmitted in the optical communication network is an optical signal in the C+L band and a fault occurs in an optical fiber transmission line for transmitting the optical signal in the C band, OLP device 104 will perform a switchover of the optical signal in the C band, but OLP device 204 will not perform a synchronous switchover of the optical signal in the L band (i.e., a linked switchover).

[0079] Since Raman scattering occurs during the transmission of optical signals along optical fibers, the Raman effect will occur, that is, the energy (such as optical power) of short-wavelength optical signals will be transferred to long-wavelength optical signals. In particular, when the transmitted optical signal is an optical signal in the C+L band, the Raman effect will be stronger, and the energy of the optical signal in the C band will be transferred to the optical signal in the L band. At this time, if a fault occurs during the transmission of the optical signal in the C band along a fiber-optic transmission line, the receiving end will only switch the optical signal in the C band. Since the optical signal in the L band may still be normally transmitted to the receiving end, the receiving end will not switch the optical signal in the L band (i.e., linked switching). However, the energy of the optical signal in the C band is no longer transferred to the optical signal in the L band, which will cause the quality of the optical signal in the L band to deteriorate, affecting the transmission quality of the optical communication network.

[0080] Based on the above, exemplarily, referring to Figure 3 as shown, an embodiment of the present application provides a schematic diagram of the optical power change amount of an optical signal in the L band. Among them, in combination with Figure 3 as shown, the abscissa is the wavelength, with the unit of nanometer (nm), and the ordinate is the optical power change amount (both are negative values), with the unit of decibel (dB). The optical signal in the L band includes optical signals of multiple wavelengths (refer to the multiple hollow dots in the figure). Specifically, Figure 3 shows the distribution of the optical power change amounts of the optical signals of multiple wavelengths included in the L band when the optical signals in the C band and the L band are transmitted along the same optical fiber and a fault occurs in the transmission of the optical signal in the C band: that is, the longer the wavelength of the optical signal, the greater the optical power change amount.

[0081] Exemplarily, referring to Figure 4 as shown, an embodiment of the present application provides a distribution diagram of the optical power of optical signals in different scenarios. In combination with Figure 4 as shown, the line formed by connecting multiple solid dots is used to represent the optical signal in the C band, and any solid dot can be used to represent an optical signal corresponding to a certain wavelength in the C band; the line formed by connecting multiple hollow dots is used to represent the optical signal in the L band, and any hollow dot can be used to represent an optical signal corresponding to a certain wavelength in the C band. Among them, the abscissa is time, the ordinate is the optical power of the optical signal, and the dashed line represents the threshold of the optical power. Specifically, when the optical power of the optical signal is detected to be lower than the threshold during the transmission of the optical signal along the optical fiber, it is considered that a fault occurs in the transmission of the optical signal along the optical fiber.

[0082] In a possible implementation manner, during the T1 time period, the optical signals in the C band and the L band are transmitted along different optical fibers respectively; during the T2 time period, the optical signals in the C band and the L band are transmitted along the same optical fiber; during the T3 time period, the optical signals in the C band and the L band are transmitted along the same optical fiber, and a fault occurs in the transmission of the optical signal in the C band.

[0083] Specifically, in combination with Figure 4 As shown, during the T1 time period, the optical power distribution of the optical signals of multiple wavelengths included in the C band is relatively uniform, and the optical powers of the optical signals of each wavelength are almost the same; the optical power distribution of the optical signals of multiple wavelengths included in the L band is also relatively uniform, and the optical powers of the optical signals of each wavelength are almost the same. During the T2 time period, due to the SRS effect when the optical signals in the C band and the L band are transmitted along the same optical fiber, the energy (such as optical power) of the optical signals with short wavelengths transfers to long wavelengths. Therefore, the optical powers of the optical signals of multiple wavelengths included in the C band gradually increase, and at the same time, the optical power of the optical signals in the C band will transfer to the optical signals in the L band, and the optical powers of the optical signals of multiple wavelengths included in the L band also gradually increase. During the T3 time period, the optical signals in the C band and the L band are transmitted along the same optical fiber, and a fault occurs in the transmission of the optical signals in the C band. At this time, the optical powers of the optical signals of multiple wavelengths included in the C band are 0, and the optical power of the optical signals in the C band will no longer transfer to the optical signals in the L band; as a result, the optical powers of the optical signals of multiple wavelengths included in the L band will decrease as a whole to a certain extent, and the longer the wavelength of the optical signals in the L band, the more the optical power decreases. Therefore, the optical powers of the optical signals of multiple wavelengths included in the L band gradually decrease.

[0084] Based on the above, if a fault occurs in the transmission of the optical signals in the C band, the energy of the optical signals in the C band will not be able to transfer to the optical signals in the L band, resulting in a decrease in the optical power of the optical signals in the L band, and the longer the wavelength of the optical signal, the more the optical power decreases. Although the receiving end can determine through detection that the total optical power of all wavelengths of optical signals included in the L band decreases, and the optical signals in the L band deteriorate. However, since the total optical power of the optical signals does not reach the threshold for triggering a switch (referring to the fact that during the T3 time period, the optical power of the optical signals in the L band is still higher than the optical power threshold), the receiving end does not perform a switch on the optical signals in the L band. This will seriously affect the transmission quality of the optical signals in the L band, and the transmission quality of the optical communication network will also be affected accordingly.

[0085] Based on the above problems, usually, a controller is set in the optical communication network to improve the transmission quality of the optical communication network. Exemplarily, referring to Figure 5 As shown, an embodiment of the present application provides a schematic diagram of an optical communication network. In combination with Figure 5 As shown, the optical communication network includes: four OLP devices (i.e., OLP device 401 to OLP device 404), four transmission devices (i.e., Figure 5The OLP devices 401 and 402 are used for transmitting optical signals in the C band, the OLP devices 403 and 404 are used for transmitting optical signals in the L band, and the main optical fiber line (refer to Figure 5 ) includes device 406, device 407, and a backup optical fiber line (refer to Figure 5 ) includes device 408 and device 409.

[0086] For the sake of explanation, only Figure 5 The architecture shown is taken as an example, and the architecture of the optical communication network should not be limited thereto. For example, one or more of the above-mentioned devices 406 to 409 may be amplifiers. Of course, one or more of the above-mentioned devices 406 to 409 may also be implemented by other possible devices, and the embodiments of the present application do not limit this.

[0087] Specific, combined Figure 5 As shown, when the optical fiber at point A is broken, the OLP device 401 recognizes that a fault has occurred at point A, triggers switching, and reports the fault to the controller 410. The controller 410 searches for the corresponding device (for example, the OLP device 403) and linkage operation (for example, the OLP device 403 and the OLP device 401 are switched in linkage) associated with the fault according to the switching rule. The controller 410 sends a command to the associated OLP device 403, so that the OLP device 403 is also switched in linkage.

[0088] However, the above scheme needs to be linked through corresponding signal transmission (reporting faults, issuing commands, etc.), which makes the linkage switching time-consuming and difficult to achieve fast linkage switching (within 50ms). At the same time, the communication between the controller and each device in the optical communication network may fail (for example, the main control software or main control board of the central controller is abnormal), which will cause the associated devices (such as OLP device 401 and OLP device 403) to be unable to achieve linkage switching, and the service may be interrupted for a long time. In addition, the above scheme is difficult to meet the switching requirements of more scenarios, such as complex scenarios, recovery scenarios, forced switching and other scenarios.

[0089] Based on the above structure, for example, refer to Figure 6 As shown, an embodiment of the present application provides a schematic diagram of an optical transmission device. Figure 6 As shown, the optical transmission device includes: an OLP circuit 501 , an OLP circuit 502 and a control circuit 503 .

[0090] Combination Figure 6As shown in the figure, the OLP circuit 501 is connected to the optical fiber line A through the FIU 505, and the OLP circuit 501 is also connected to the optical fiber line B through the FIU 506; the OLP circuit 502 is connected to the optical fiber line A through the FIU 505, and the OLP circuit 502 is also connected to the optical fiber line B through the FIU 506. Among them, the OLP circuit 501 and the OLP circuit 502 are communicatively connected to the control circuit 503.

[0091] For the convenience of description, in Figure 6 the optical fiber line A is used as the working optical fiber line (main path), and the optical fiber line B is used as the protection optical fiber line (backup path), but the embodiments of the present application should not be limited thereby.

[0092] Specifically, as shown in Figure 6 the figure, the OLP circuit 501 receives the optical signal 1 transmitted by the optical fiber line A through the FIU 505, and receives the optical signal 2 transmitted by the optical fiber line B through the FIU 506. Among them, the optical signals 1 and 2 belong to the first band. The OLP circuit 502 receives the optical signal 3 transmitted by the optical fiber line A through the FIU 505, and receives the optical signal 4 transmitted by the optical fiber line A through the FIU 506. Among them, the optical signals 3 and 4 belong to the second band. The control circuit 503 controls the OLP circuit 501 to switch from receiving the optical signal 1 of the first band from the optical fiber line A to receiving the optical signal 2 of the first band from the optical fiber line B, and controls the OLP circuit 502 to switch from receiving the optical signal 3 of the second band from the optical fiber line A to receiving the optical signal 4 of the second band from the optical fiber line B. Among them, the first band and the second band have different wavelength ranges.

[0093] Optionally, the first band is: 1530 nanometers to 1565 nanometers; the second band is: 1565 nanometers to 1625 nanometers. In this way, the first band can be the C band, and the second band can be the L band. However, the embodiments of the present application do not limit the specific types of the first band and the second band. For example, the first band can include optical signals of other wavelengths, and the second band can also include optical signals of other wavelengths.

[0094] As shown in Figure 6 the figure, in a possible implementation manner, the first band is the C band, the second band is the L band, the optical fiber line A is the main path (which can also be called the working path), and the optical fiber line B is the backup path (which can also be called the protection path). Specifically, as shown in Figure 6As shown, the OLP circuit 501 receives the optical signal 1 in the C band transmitted by the optical fiber line A through the FIU 505, and receives the optical signal 2 in the C band transmitted by the optical fiber line B through the FIU 506. The OLP circuit 502 receives the optical signal 3 in the L band transmitted by the optical fiber line A through the FIU 505, and receives the optical signal 4 in the L band transmitted by the optical fiber line B through the FIU 506. At a certain moment, a fault occurs during the transmission of the optical signal 1 in the C band (refer to Figure 6 as shown). In this way, the control circuit 503 can control the OLP circuit 501 to switch from receiving the optical signal 1 from the optical fiber line A to receiving the optical signal 2 from the optical fiber line B, thereby completing the switching of the optical signal in the C band. The control circuit 503 can also control the OLP circuit 502 to switch from receiving the optical signal 3 from the optical fiber line A to receiving the optical signal 4 from the optical fiber line B, that is, to realize the linkage switching of the optical signal in the L band. Of course, in some other examples, the control circuit 503 can also control the OLP circuit 502 to continue to receive the optical signal 3 from the optical fiber line A, that is, to choose not to perform the linkage switching of the optical signal in the L band.

[0095] In a possible implementation manner, the OLP circuit 501 can send a detection result to the control circuit 503 based on the optical fiber line A and the optical fiber line B. Among them, the detection result can indicate the transmission situation of the optical signal in the first band along the optical fiber line A and the optical fiber line B. Optionally, the optical signal 1 received by the OLP circuit 501 from the optical fiber line A and the optical signal 2 received by the OLP circuit 501 from the optical fiber line B detect the quality of the optical signal 1 and the optical signal 2, and send the corresponding detection result to the control circuit. Similarly, the OLP circuit 502 can also send a detection result to the control circuit 503 based on the optical signal 3 and the optical signal 4. Specifically, the optical signal 3 received by the OLP circuit 502 from the optical fiber line A and the optical signal 4 received by the OLP circuit 502 from the optical fiber line B detect the quality of the optical signal 3 and the optical signal 4, and send the corresponding detection result to the control circuit. Further, the control circuit 503 controls the OLP circuit 501 and the OLP circuit 502 based on the received detection result.

[0096] In a possible implementation manner, the control circuit 503 controls the OLP circuit 501 to switch to receiving the optical signal 1 from the optical fiber line B in response to the control signal by sending a control signal (for example, the first control signal) to the OLP circuit 501. The control circuit 503 also responds to the control signal and controls the OLP circuit 502 to switch to receiving the optical signal 3 from the optical fiber line A or receiving the optical signal 4 from the optical fiber line B in response to the control signal by sending a control signal (for example, the second control signal or the third control signal) to the OLP circuit 502.

[0097] Based on the above, the optical transmission device provided by the embodiments of the present application can achieve the linkage switching of optical signals in two different bands, and the linkage switching takes less time, enabling the entire switching process to be completed quickly with relatively high reliability.

[0098] It is not difficult to understand that, for the convenience of description, Figure 6 only one possible architecture in which the OLP circuit 501 and the OLP circuit 502 are integrated in the same device is shown, and the embodiments of the present application should not be limited thereby. For example, referring to Figure 6 as shown, the OLP circuit 501 and the OLP circuit 502 can be integrated on the same single board. Of course, in some other examples, one or more control circuits can be integrated on the control circuit 503 for separately controlling the OLP circuit 501 and the OLP circuit 502.

[0099] Based on Figure 6 the architecture shown, exemplarily, as shown in Table 1, the embodiments of the present application show a principle of linkage switching, and this principle is applicable to the scenario where optical signals in the C band and the L band are transmitted along the same optical fiber. Among them, the vertical header (the first column in the vertical direction) shows the transmission situation of the optical fiber line at the initial moment, and the horizontal header (the first row in the horizontal direction) represents the type of fault that occurs.

[0100] The principle of the optical transmission device for linkage switching is specifically described as follows in combination with Table 1:

[0101]

[0102] Table 1

[0103] Combined with the above table, the following eight examples are provided:

[0104] Example (1): The transmission situation of the optical fiber line at the initial moment is that both the main path and the backup path of the C band are transmitting normally, and both the main path and the backup path of the L band are transmitting normally. At a certain moment, a fault occurs in the transmission of the main path of the C band. At this time, the C band is switched, and it is switched to the backup path; the L band performs linkage switching, that is, the optical signal of the L band is switched to the backup path for transmission. Correspondingly, combined with Figure 6As shown in the figure, the optical transmission device specifically performs the following operations to implement Example (1). Among them, the OLP circuit 501 is used to transmit optical signals in the C band, and the OLP circuit 502 is used to transmit optical signals in the L band. Specifically, the OLP circuit 501 sends a first detection result to the control circuit 503 based on the optical fiber line A and the optical fiber line B. The first detection result indicates that the optical signal 1 has an abnormal transmission along the optical fiber line A, and the optical signal 2 has a normal transmission along the optical fiber line B. Based on the received first detection result, the control circuit 503 controls the OLP circuit 501 to receive the optical signal 2 from the optical fiber line B, and the OLP circuit 501 performs a switchover and switches to the standby path. The OLP circuit 502 sends a third detection result to the control circuit 503 based on the optical fiber line A and the optical fiber line B. The third detection result indicates that the optical signal 3 has a normal transmission along the optical fiber line A, and the optical signal 4 has a normal transmission along the optical fiber line B. Based on the third detection result, the control circuit 503 controls the OLP circuit 502 to receive the output optical signal 4 from the optical fiber line B, so that the OLP circuit 502 performs a linkage switchover and also switches to the standby path.

[0105] Example (2): The initial transmission situation of the optical fiber line is as follows: both the main path and the standby path of the C band have normal transmissions, and the main path of the L band has a normal transmission while the standby path has an abnormal transmission. At a certain moment, a fault occurs in the transmission of the main path of the C band. At this time, the C band performs a switchover and switches to the standby path; the L band does not perform a linkage switchover, that is, the optical signals in the L band still pass through the main path for transmission. Correspondingly, combined with Figure 6 As shown in the figure, the optical transmission device specifically performs the following operations to implement Example (2). Among them, the OLP circuit 501 is used to transmit optical signals in the C band, and the OLP circuit 502 is used to transmit optical signals in the L band. Specifically, the OLP circuit 501 sends a first detection result to the control circuit 503 based on the optical fiber line A and the optical fiber line B. The first detection result indicates that the optical signal 1 has an abnormal transmission along the optical fiber line A, and the optical signal 2 has a normal transmission along the optical fiber line B. Based on the first detection result, the control circuit 503 controls the OLP circuit 501 to receive the optical signal 2 from the optical fiber line B, and the OLP circuit 501 performs a switchover and switches to the standby path. The OLP circuit 502 sends a fourth detection result to the control circuit 503 based on the optical fiber line A and the optical fiber line B. The fourth detection result indicates that the optical signal 3 has a normal transmission along the optical fiber line A, and the optical signal 4 has an abnormal transmission along the optical fiber line B. Based on the fourth detection result, the control circuit 503 controls the OLP circuit 502 to receive the optical signal 3 from the optical fiber line A, and the OLP circuit 502 does not perform a linkage switchover and still passes through the main path for transmission.

[0106] Example (3): The transmission status of the optical fiber line at the initial moment is as follows: The main path of the C band transmits normally, and the backup path transmits abnormally. Both the main path and the backup path of the L band transmit normally. At a certain moment, a fault occurs in the main path of the C band. At this time, no switching is performed in the C band, and the signal still transmits through the main path; no linked switching is performed in the L band, that is, the optical signal in the L band still transmits through the main path. Correspondingly, in combination with Figure 6 As shown, the optical transmission device specifically performs the following operations to implement this Example (3). Among them, the OLP circuit 501 is used to transmit the optical signal of the C band, and the OLP circuit 502 is used to transmit the optical signal of the L band. Specifically, the OLP circuit 501 sends the second detection result to the control circuit 503 based on the optical fiber line A and the optical fiber line B. The second detection result indicates that the optical signal 1 transmits abnormally along the optical fiber line A, and the optical signal 2 transmits abnormally along the optical fiber line B; based on the second detection result, the control circuit 503 controls the OLP circuit 501 to receive the optical signal 1 from the optical fiber line A. The OLP circuit 501 does not perform switching and still transmits through the main path; the OLP circuit 502 sends the fifth detection result to the control circuit 503 based on the optical fiber line A and the optical fiber line B. The fifth detection result indicates that the optical signal 3 transmits normally along the optical fiber line A, and the optical signal 4 transmits normally along the optical fiber line B; based on the fifth detection result, the control circuit 503 controls the OLP circuit 502 to receive the optical signal 3 from the optical fiber line A. The OLP circuit 502 also does not perform switching and still transmits through the main path.

[0107] Example (4): The transmission status of the optical fiber line at the initial moment is as follows: The main path of the C band transmits normally, and the backup path transmits abnormally. The main path of the L band transmits normally, and the backup path transmits abnormally. At a certain moment, a fault occurs in the main path of the C band. At this time, no switching is performed in the C band, and the signal still transmits through the main path; no linked switching is performed in the L band, that is, the optical signal in the L band still transmits through the main path. Correspondingly, in combination with Figure 6As shown in the figure, the optical transmission device specifically performs the following operations to implement Example (4). Among them, the OLP circuit 501 is used to transmit optical signals in the C band, and the OLP circuit 502 is used to transmit optical signals in the L band. Specifically, the OLP circuit 501 sends a second detection result to the control circuit 503 based on the optical fiber line A and the optical fiber line B. The second detection result indicates that the optical signal 1 has an abnormal transmission along the optical fiber line A, and the optical signal 2 has an abnormal transmission along the optical fiber line B. Based on the second detection result, the control circuit 503 controls the OLP circuit 501 to receive the optical signal 1 from the optical fiber line A. The OLP circuit 501 does not perform a switchover and still transmits through the main path. The OLP circuit 502 sends a fourth detection result to the control circuit 503 based on the optical fiber line A and the optical fiber line B. The fourth detection result indicates that the optical signal 3 has a normal transmission along the optical fiber line A, and the optical signal 4 has an abnormal transmission along the optical fiber line B. Based on the fourth detection result, the control circuit 503 controls the OLP circuit 502 to receive the optical signal 3 from the optical fiber line A. The OLP circuit 502 also does not perform a switchover and still transmits through the main path.

[0108] Example (5): The initial transmission situation of the optical fiber line is as follows: both the main path and the backup path of the C band transmit normally, and both the main path and the backup path of the L band transmit normally. At a certain moment, a fault occurs in the transmission of the main path of the L band. At this time, the L band performs a switchover and switches to the backup path; the C band performs a linked switchover, that is, the optical signal of the C band is switched to the backup path for transmission. Correspondingly, combined with Figure 6 As shown in the figure, the optical transmission device specifically performs the following operations to implement Example (5). Among them, the OLP circuit 501 is used to transmit optical signals in the C band, and the OLP circuit 502 is used to transmit optical signals in the L band. Specifically, the OLP circuit 502 sends a sixth detection result to the control circuit 503 based on the optical fiber line A and the optical fiber line B. The sixth detection result indicates that the optical signal 3 has an abnormal transmission along the optical fiber line A, and the optical signal 4 has a normal transmission along the optical fiber line B. Based on the sixth detection result, the control circuit 503 controls the OLP circuit 502 to receive the optical signal 4 from the optical fiber line B. The OLP circuit 502 performs a switchover and switches to the backup path. The OLP circuit 501 sends an eighth detection result to the control circuit 503 based on the optical fiber line A and the optical fiber line B. The eighth detection result indicates that the optical signal 1 has a normal transmission along the optical fiber line A, and the optical signal 2 has a normal transmission along the optical fiber line B. Based on the eighth detection result, the control circuit 503 controls the OLP circuit 501 to receive the optical signal 2 from the optical fiber line B. The OLP circuit 501 performs a linked switchover and also switches to the backup path.

[0109] Example (6): The transmission status of the optical fiber line at the initial moment is as follows: both the main and standby paths of the C band are transmitting normally, the main path of the L band is transmitting normally, and the standby path is transmitting abnormally. At a certain moment, a fault occurs in the transmission of the main path of the L band. At this time, no switching occurs in the L band, and the transmission still passes through the main path; no cascaded switching occurs in the C band, that is, the optical signal in the C band still passes through the main path. Correspondingly, combined with Figure 6 As shown, the optical transmission device specifically performs the following operations to implement this Example (6). Among them, the OLP circuit 501 is used to transmit the optical signal of the C band, and the OLP circuit 502 is used to transmit the optical signal of the L band. Specifically, the OLP circuit 502 sends the seventh detection result to the control circuit 503 based on the optical fiber line A and the optical fiber line B. The seventh detection result indicates that the optical signal 3 is abnormally transmitted along the optical fiber line A, and the optical signal 4 is abnormally transmitted along the optical fiber line B; based on the seventh detection result, the control circuit 503 controls the OLP circuit 502 to receive the optical signal 3 from the optical fiber line A. The OLP circuit 502 does not perform switching and still transmits through the main path; the OLP circuit 501 sends the tenth detection result to the control circuit 503 based on the optical fiber line A and the optical fiber line B. The tenth detection result indicates that the optical signal 1 is normally transmitted along the optical fiber line A, and the optical signal 2 is normally transmitted along the optical fiber line B; based on the tenth detection result, the control circuit 503 controls the OLP circuit 501 to receive the optical signal 1 from the optical fiber line A, and the OLP circuit 501 also does not perform switching and still transmits through the main path.

[0110] Example (7): The transmission status of the optical fiber line at the initial moment is as follows: the main path of the C band is transmitting normally, the standby path is transmitting abnormally, and both the main and standby paths of the L band are transmitting normally. At a certain moment, a fault occurs in the transmission of the main path of the L band. At this time, switching occurs in the L band and switches to the standby path; no cascaded switching occurs in the C band, that is, the optical signal in the C band still passes through the main path. Correspondingly, combined with Figure 6 As shown, the optical transmission device specifically performs the following operations to implement this Example (7). Among them, the OLP circuit 501 is used to transmit the optical signal of the C band, and the OLP circuit 502 is used to transmit the optical signal of the L band. Specifically, the OLP circuit 502 sends the sixth detection result to the control circuit 503 based on the optical fiber line A and the optical fiber line B. The sixth detection result indicates that the optical signal 3 is abnormally transmitted along the optical fiber line A, and the optical signal 4 is normally transmitted along the optical fiber line B; based on the sixth detection result, the control circuit 503 controls the OLP circuit 502 to receive the optical signal 4 from the optical fiber line B. The OLP circuit 502 performs switching and switches to the standby path; the OLP circuit 501 sends the ninth detection result to the control circuit 503 based on the optical fiber line A and the optical fiber line B. The ninth detection result indicates that the optical signal 1 is normally transmitted along the optical fiber line A, and the optical signal 2 is abnormally transmitted along the optical fiber line B; based on the ninth detection result, the control circuit 503 controls the OLP circuit 501 to receive the optical signal 1 from the optical fiber line A, and the OLP circuit 501 does not perform cascaded switching and still transmits through the main path.

[0111] Example (VIII): The transmission status of the optical fiber line at the initial moment is as follows: the main path of the C band transmits normally, and the backup path transmits abnormally; the main path of the L band transmits normally, and the backup path transmits abnormally. At a certain moment, a fault occurs in the main path of the L band. At this time, no switching occurs in the L band, and the signal still transmits through the main path; no cascaded switching occurs in the C band, that is, the optical signal in the C band still transmits through the main path. Correspondingly, as shown in Figure 6 the optical transmission device specifically performs the following operations to implement this Example (VIII). Among them, the OLP circuit 501 is used to transmit the optical signal of the C band, and the OLP circuit 502 is used to transmit the optical signal of the L band. Specifically, the OLP circuit 502 sends the seventh detection result to the control circuit 503 based on the optical fiber line A and the optical fiber line B. The seventh detection result indicates that the optical signal 3 transmits abnormally along the optical fiber line A, and the optical signal 4 transmits abnormally along the optical fiber line B; based on the seventh detection result, the control circuit 503 controls the OLP circuit 502 to receive the optical signal 3 from the optical fiber line A. The OLP circuit 502 does not perform switching and still transmits through the main path; the OLP circuit 501 sends the ninth detection result to the control circuit 503 based on the optical fiber line A and the optical fiber line B. The ninth detection result indicates that the optical signal 1 transmits normally along the optical fiber line A, and the optical signal 2 transmits abnormally along the optical fiber line B; based on the ninth detection result, the control circuit 503 controls the OLP circuit 501 to receive the optical signal 1 from the optical fiber line A. The OLP circuit 501 does not perform cascaded switching and still transmits through the main path.

[0112] Therefore, the embodiments of the present application can, based on the detection results indicating the transmission status of the optical fiber line (including abnormal transmission, normal transmission, main path failure, and backup path failure), adaptively follow the above cascaded switching principle, and through the optical transmission device provided by the embodiments of the present application, achieve the cascaded switching of optical signals in two different bands, thereby effectively improving the transmission quality of the optical communication network.

[0113] It should be noted that the examples provided in the above table are only one possible cascaded switching principle. Figure 6 For the optical transmission device shown, it can also perform corresponding switching on the transmission of optical signals based on other possible cascaded switching principles. The embodiments of the present application do not limit this.

[0114] In addition, when hardware failures such as optical fiber breakage and damage to the integrated single board of the OLP circuit occur, based on the Figure 6 architecture shown, the embodiments of the present application can achieve the rapid recovery of services (optical signal transmission) and avoid long interruptions of services caused by the SRS effect. That is, in another example, the above optical transmission device can also be used for the cascaded recovery of optical signals in two different bands.

[0115] Exemplarily, the first band is the C band, the second band is the L band, the optical fiber line A is the main path (working path), and the optical fiber line B is the backup path (protection path). At the first moment, the optical signals in the C band and the L band are both abnormal when transmitted along the optical fiber line A and both normal when transmitted along the protection optical fiber line. Therefore, the OLP circuit 501 receives the optical signal 2 in the C band from the optical fiber line B, and the OLP circuit 502 receives the optical signal 4 in the L band from the optical fiber line B.

[0116] At the second moment, in combination with Figure 6 as shown, for the OLP circuit 501: The OLP circuit 501 receives the optical signal 1 in the C band transmitted by the optical fiber line A through the FIU 505, receives the optical signal 2 in the C band transmitted by the optical fiber line B through the FIU 506, and sends the detection result to the control circuit 503. Exemplarily, the detection result is the eleventh detection result, and the eleventh detection result can indicate that the transmission of the optical signal in the C band along the optical fiber line A has returned to normal ( Figure 6 the fault that occurred in the optical fiber line A in

[0117] has been recovered), and the transmission along the optical fiber line B is also normal. Further, based on the received eleventh detection result, the control circuit controls the OLP circuit 501 to receive the optical signal 1 from the optical fiber line A, that is, the optical signal in the C band resumes transmission through the main path. Figure 6 At the second moment, in combination with Figure 6 as shown, for the OLP circuit 502: The OLP circuit 502 receives the optical signal 3 in the L band transmitted by the optical fiber line A through the FIU 505, and receives the optical signal 4 in the L band transmitted by the optical fiber line B through the FIU 505, and sends the detection result to the control circuit 503. Exemplarily, the detection result is the thirteenth detection result, and the thirteenth detection result can indicate that the transmission of the optical signal in the L band along the optical fiber line A has returned to normal (

[0118] the fault that occurred in the optical fiber line A in

[0119] Figure 6 has been recovered), and the transmission along the optical fiber line B is also normal. Further, based on the received thirteenth detection result, the control circuit controls the OLP circuit 502 to receive the optical signal 3 from the optical fiber line A, that is, to realize the linkage recovery of the optical signal in the L band.

[0118] In this way, the optical transmission device provided by the embodiments of the present application can realize the line recovery of optical signals in two different bands. Among them, optionally, the detection results sent by the OLP circuit (including the OLP circuit 501 and the OLP circuit 502) to the control circuit 503 can be generated by the OLP circuit through detecting the received signals, or can be generated by other possible methods, and the embodiments of the present application do not limit this.

[0119] For ease of explanation, the following takes the case where the OLP circuit 501 sends the thirteenth detection result to the control circuit 503 and the OLP circuit 502 sends the thirteenth detection result to the control circuit 503 as an example, but the embodiments of the present application should not be limited thereby. In other examples, the detection results sent by the OLP circuit (including the OLP circuit 501 and the OLP circuit 502) to the control circuit 503 further include other possible detection results. Further, based on the received detection results, the control circuit can control the corresponding OLP circuit to perform line restoration or not perform line restoration. For example, based on the received detection results, the control circuit can also control the OLP circuit 501 to perform line restoration on the optical signals in the first band, and control the OLP circuit 502 not to perform line restoration on the optical signals in the second band.

[0120] It should be noted that only one possible implementation manner described above is taken as an example here to illustrate the specific process of the optical transmission device realizing the linkage restoration of optical signals in two bands, and the embodiments of the present application should not be limited thereby.

[0121] Based on the above, combined with Figure 6 the architecture shown, exemplarily, as shown in Table 2, the embodiments of the present application show a linkage restoration principle, and this principle is applicable to the scenario where the optical signals in the C band and the L band are transmitted along the same optical fiber.

[0122] Among them, the vertical header (the first column in the vertical direction) shows the transmission situation of the optical fiber line, and the horizontal header (the first row in the horizontal direction) represents the type of fault recovery.

[0123] The principle of the optical transmission device for performing linkage restoration is specifically described as follows in combination with Table 2:

[0124]

[0125] Table 2

[0126] Combined with the above table, the following eight examples are provided:

[0127] Example (IX): The transmission situation of the optical fiber line is that the main path transmission of the C band is abnormal and the backup path transmission is normal, and the main path transmission of the L band is abnormal and the backup path transmission is normal. At a certain moment, the main path transmission of the C band is restored. At this time, the C band performs restoration and switches to the main path; the L band does not perform linkage restoration, that is, the optical signals in the L band still pass through the backup path for transmission. Correspondingly, combined with Figure 6As shown, the optical transmission device specifically performs the following operations to implement Example (IX). Among them, the OLP circuit 501 is used to transmit optical signals in the C band, and the OLP circuit 502 is used to transmit optical signals in the L band. Specifically, the OLP circuit 501 sends the eleventh detection result to the control circuit 503 based on the optical fiber line A and the optical fiber line B. The eleventh detection result indicates that the optical signal 1 is transmitted normally along the optical fiber line A, and the optical signal 2 is transmitted normally along the optical fiber line B. Based on the eleventh detection result, the control circuit 503 controls the OLP circuit 501 to receive the optical signal 1 from the optical fiber line A, and the OLP circuit 501 performs line restoration, and the optical signal in the C band is transmitted through the main path. The OLP circuit 502 sends the fourteenth detection result to the control circuit 503 based on the optical fiber line A and the optical fiber line B. The fourteenth detection result indicates that the optical signal 3 is abnormally transmitted along the optical fiber line A, and the optical signal 4 is transmitted normally along the optical fiber line B. Based on the fourteenth detection result, the control circuit 503 controls the OLP circuit 502 to receive the optical signal 4 from the optical fiber line B, and the OLP circuit 502 does not perform linkage restoration, and the optical signal in the L band is still transmitted through the backup path.

[0128] Example (X): The transmission situation of the optical fiber line is as follows: the main path transmission of the C band is abnormal, and the backup path transmission is normal; the main path and the backup path of the L band are both transmitted normally. At a certain moment, the main path transmission of the C band is restored. At this time, the C band is restored and switched to the main path; the L band performs linkage restoration, that is, the optical signal in the L band is switched to the main path for transmission. Correspondingly, combined with Figure 6 As shown, the optical transmission device specifically performs the following operations to implement Example (X). Among them, the OLP circuit 501 is used to transmit optical signals in the C band, and the OLP circuit 502 is used to transmit optical signals in the L band. Specifically, the OLP circuit 501 sends the eleventh detection result to the control circuit 503 based on the optical fiber line A and the optical fiber line B. The eleventh detection result indicates that the optical signal 1 is transmitted normally along the optical fiber line A, and the optical signal 2 is transmitted normally along the optical fiber line B. Based on the eleventh detection result, the control circuit 503 controls the OLP circuit 501 to receive the optical signal 1 from the optical fiber line A, and the OLP circuit 501 performs line restoration, and the optical signal in the C band is transmitted through the main path. The OLP circuit 502 sends the thirteenth detection result to the control circuit 503 based on the optical fiber line A and the optical fiber line B. The thirteenth detection result indicates that the optical signal 3 is transmitted normally along the optical fiber line A, and the optical signal 4 is transmitted normally along the optical fiber line B. Based on the thirteenth detection result, the control circuit 503 controls the OLP circuit 502 to receive the optical signal 3 from the optical fiber line A, and the OLP circuit 502 performs linkage restoration, and the optical signal in the L band is transmitted through the main path.

[0129] Example (XI): The transmission status of the optical fiber line is as follows: both the primary and backup transmissions in the C band are abnormal, and both the primary and backup transmissions in the L band are abnormal. At a certain moment, the primary transmission in the C band is restored. At this time, the C band is restored and switched to the primary path; the L band does not perform a linked restoration, that is, the optical signal in the L band still passes through the backup path for transmission. Accordingly, in combination with Figure 6 As shown, the optical transmission device specifically performs the following operations to implement Example (XI). Among them, the OLP circuit 501 is used to transmit the optical signal in the C band, and the OLP circuit 502 is used to transmit the optical signal in the L band. Specifically, the OLP circuit 501 sends the twelfth detection result to the control circuit 503 based on the optical fiber line A and the optical fiber line B. The twelfth detection result indicates that the optical signal 1 is transmitted normally along the optical fiber line A, and the optical signal 2 is transmitted abnormally along the optical fiber line B; based on the twelfth detection result, the control circuit 503 controls the OLP circuit 501 to receive the optical signal 1 from the optical fiber line A, and the OLP circuit 501 performs line restoration, and the optical signal in the C band is transmitted through the primary path; the OLP circuit 502 sends the fifteenth detection result to the control circuit 503 based on the optical fiber line A and the optical fiber line B. The fifteenth detection result indicates that the optical signal 3 is transmitted abnormally along the optical fiber line A, and the optical signal 4 is transmitted abnormally along the optical fiber line B; based on the fifteenth detection result, the control circuit 503 controls the OLP circuit 502 to receive the optical signal 4 from the optical fiber line B, and the OLP circuit 502 does not perform a linked restoration, and the optical signal in the L band still passes through the backup path for transmission.

[0130] Example (XII): The transmission status of the optical fiber line is as follows: the C band transmission is abnormal and the backup transmission is normal, and the L band primary transmission is abnormal and the backup transmission is normal. At a certain moment, the L band primary transmission is restored. At this time, the L band is restored and switched to the primary path; the C band does not perform a linked restoration, that is, the optical signal in the C band still passes through the backup path for transmission. Accordingly, in combination with Figure 6As shown in the figure, the optical transmission device specifically performs the following operations to implement Example (12). Among them, the OLP circuit 501 is used to transmit optical signals in the C band, and the OLP circuit 502 is used to transmit optical signals in the L band. Specifically, the OLP circuit 502 sends the sixteenth detection result to the control circuit 503 based on the optical fiber line A and the optical fiber line B. The sixteenth detection result indicates that the optical signal 3 is transmitted normally along the optical fiber line A, and the optical signal 4 is transmitted normally along the optical fiber line B. Based on the sixteenth detection result, the control circuit 503 controls the OLP circuit 502 to receive the optical signal 3 from the optical fiber line A. The OLP circuit 502 performs line restoration, and the optical signal in the L band is transmitted through the main path. The OLP circuit 501 sends the nineteenth detection result to the control circuit 503 based on the optical fiber line A and the optical fiber line B. The nineteenth detection result indicates that the optical signal 1 is transmitted abnormally along the optical fiber line A, and the optical signal 2 is transmitted normally along the optical fiber line B. Based on the nineteenth detection result, the control circuit 503 controls the OLP circuit 501 to receive the optical signal 2 from the optical fiber line B. The OLP circuit 501 does not perform linkage restoration, and the optical signal in the C band is still transmitted through the backup path.

[0131] Example (13): The transmission conditions of the optical fiber lines are as follows: both the main path and the backup path of the C band are transmitted normally, the main path of the L band is transmitted abnormally, and the backup path is transmitted normally. At a certain moment, the main path transmission of the L band is restored. At this time, the L band is restored and switched to the main path; the C band performs linkage restoration, that is, the optical signal in the C band is switched to the main path for transmission. Corresponding to this, combined with Figure 6 As shown in the figure, the optical transmission device specifically performs the following operations to implement Example (13). Among them, the OLP circuit 501 is used to transmit optical signals in the C band, and the OLP circuit 502 is used to transmit optical signals in the L band. Specifically, the OLP circuit 502 sends the sixteenth detection result to the control circuit 503 based on the optical fiber line A and the optical fiber line B. The sixteenth detection result indicates that the optical signal 3 is transmitted normally along the optical fiber line A, and the optical signal 4 is transmitted normally along the optical fiber line B. Based on the sixteenth detection result, the control circuit 503 controls the OLP circuit 502 to receive the optical signal 3 from the optical fiber line A. The OLP circuit 502 performs line restoration, and the optical signal in the L band is transmitted through the main path. The OLP circuit 501 sends the eighteenth detection result to the control circuit 503 based on the optical fiber line A and the optical fiber line B. The eighteenth detection result indicates that the optical signal 1 is transmitted normally along the optical fiber line A, and the optical signal 2 is transmitted normally along the optical fiber line B. Based on the eighteenth detection result, the control circuit 503 controls the OLP circuit 501 to receive the optical signal 1 from the optical fiber line A. The OLP circuit 501 performs linkage restoration, and the optical signal in the C band is transmitted through the main path.

[0132] Example (XIV): The transmission status of the optical fiber line is as follows: both the primary and backup paths of the C-band have abnormal transmissions, and both the primary and backup paths of the L-band have abnormal transmissions. At a certain moment, the transmission of the primary path of the L-band is restored. At this time, the L-band is restored and switched to the primary path; the C-band does not perform a linked restoration, that is, the optical signal of the C-band still passes through the backup path for transmission. Correspondingly, in combination with Figure 6 as shown, the optical transmission device specifically performs the following operations to implement this Example (XIV). Among them, the OLP circuit 501 is used to transmit the optical signal of the C-band, and the OLP circuit 502 is used to transmit the optical signal of the L-band. Specifically, the OLP circuit 502 sends the seventeenth detection result to the control circuit 503 based on the optical fiber line A and the optical fiber line B. The seventeenth detection result indicates that the optical signal 3 is transmitted normally along the optical fiber line A, and the optical signal 4 is transmitted abnormally along the optical fiber line B; based on the seventeenth detection result, the control circuit 503 controls the OLP circuit 502 to receive the optical signal 3 from the optical fiber line A. The OLP circuit 502 performs line restoration, and the optical signal of the L-band is transmitted through the primary path; the OLP circuit 501 sends the twentieth detection result to the control circuit 503 based on the optical fiber line A and the optical fiber line B. The twentieth detection result indicates that the optical signal 1 is transmitted abnormally along the optical fiber line A, and the optical signal 2 is transmitted abnormally along the optical fiber line B; based on the twentieth detection result, the control circuit 503 controls the OLP circuit 501 to receive the optical signal 2 from the optical fiber line B. The OLP circuit 501 does not perform a linked restoration, and the optical signal of the C-band still passes through the backup path for transmission.

[0133] Example (XV): The transmission status of the optical fiber line is as follows: both the primary and backup paths of the C-band have normal transmissions, the primary path of the L-band has abnormal transmission, and the backup path has normal transmission. At this time, the optical signal of the C-band only needs to continue to be transmitted through the primary path or the backup path without the need for restoration. Therefore, this scenario belongs to an invalid scenario and no linked restoration is required. Correspondingly, in combination with Figure 6 as shown, the optical transmission device specifically performs the following operations. Among them, the OLP circuit 501 is used to transmit the optical signal of the C-band, and the OLP circuit 502 is used to transmit the optical signal of the L-band. Specifically, based on the detection result sent by the OLP circuit 501, the control circuit 503 determines that both the primary and backup paths of the C-band have normal transmissions. Therefore, the optical signal of the C-band only needs to continue to be transmitted through the primary path or the backup path without the need for line restoration.

[0134] Example (XVI): The transmission status of the optical fiber line is as follows: the primary path of the C-band has abnormal transmission and the backup path has normal transmission, and both the primary and backup paths of the L-band have normal transmissions. At this time, the optical signal of the C-band only needs to continue to be transmitted through the primary path or the backup path without the need for restoration. Therefore, this scenario belongs to an invalid scenario and no linked restoration is required. Correspondingly, in combination with Figure 6As shown, the optical transmission device specifically performs the following operations. Among them, the OLP circuit 501 is used to transmit optical signals in the C band, and the OLP circuit 502 is used to transmit optical signals in the L band. Specifically, based on the detection result sent by the OLP circuit 502, the control circuit 503 determines that both the primary and backup transmissions in the L band are normal. Therefore, the optical signals in the L band only need to continue to be transmitted through the primary or backup path without line recovery.

[0135] Then, the embodiments of the present application can, based on the detection result indicating the transmission situation of the optical fiber line (including the fault recovery situation of the optical fiber line), in accordance with the above-mentioned linkage recovery principle, through the optical transmission device provided by the embodiments of the present application, achieve the linkage recovery of optical signals in two different bands. It can effectively improve the recovery efficiency of the optical transmission device, thereby further improving the transmission quality of the optical communication network.

[0136] It should be noted that the examples provided in the above table are only one possible linkage recovery principle. Figure 6 The optical transmission device shown can also perform corresponding recovery on the transmission of optical signals based on other possible linkage recovery principles, and the embodiments of the present application do not limit this.

[0137] In a possible implementation manner, the embodiments of the present application also provide an optical network. This optical network includes at least one optical add-drop multiplexer and an optical transmission device as provided by the embodiments of the present application (refer to Figure 6 as shown).

[0138] Optionally, the optical network may further include more optical add-drop multiplexers for transmitting optical signals in different bands to realize the connection and deployment of the optical transmission device. Among them, the optical add-drop multiplexer can be a reconfigurable optical add-drop multiplexer (ROADM).

[0139] Optionally, the optical network includes one or more amplifiers for amplifying the optical signals during the process of the optical signals. In a possible implementation manner, the optical network may further include one or more optical attenuators (for example, it can be a variable optical attenuator (VOA)) for attenuating the amplified optical signals.

[0140] Then, the optical transmission device provided by the embodiments of the present application can be deployed at a certain position during the optical fiber transmission process to protect the transmission of optical signals during the transmission process, and can achieve linkage switching and linkage recovery, which can significantly improve the transmission quality of the optical network.

[0141] In the above embodiments, it can be implemented in whole or in part by software, hardware, firmware, or any combination thereof. When implemented using a software program, it can be implemented in whole or in part in the form of a computer program product. The computer program product includes one or more computer instructions. When the computer program instructions are loaded and executed on a computer, the processes or functions described in the embodiments of the present application are generated in whole or in part. The computer can be a general-purpose computer, a special-purpose computer, a computer network, or other programmable devices. The computer instructions can be stored in a computer-readable storage medium or transmitted from one computer-readable storage medium to another. For example, the computer instructions can be transmitted from a website, computer, server, or data center to another website, computer, server, or data center via wired (such as coaxial cable, optical fiber, digital subscriber line (DSL)) or wireless (such as infrared, wireless, microwave, etc.) means. The computer-readable storage medium can be any available medium that the computer can access or a data storage device such as a server or data center that contains one or more media integrated therein. The available medium can be a magnetic medium (such as a floppy disk, hard disk, magnetic tape), an optical medium (such as a DVD), or a semiconductor medium (such as a solid state disk (SSD)), etc. In the embodiments of the present application, the computer can include the device described above.

[0142] Although the present application has been described in conjunction with various embodiments herein, however, in the process of implementing the claimed present application, those skilled in the art can understand and implement other variations of the disclosed embodiments by viewing the accompanying drawings, the disclosure content, and the appended claims. In the claims, the word "comprising" does not exclude other components or steps, and "a" or "an" does not exclude a plurality. A single processor or other unit can implement several functions recited in the claims. Certain measures are recited in mutually different dependent claims, but this does not mean that these measures cannot be combined to produce good results.

[0143] Although the present application has been described in connection with specific features and their embodiments, it will be apparent that various modifications and combinations can be made without departing from the spirit and scope of the present application. Accordingly, this specification and the drawings are merely exemplary illustrations of the present application as defined by the appended claims, and are considered to cover any and all modifications, variations, combinations, or equivalents within the scope of the present application. Obviously, those skilled in the art can make various changes and modifications to the present application without departing from the spirit and scope of the present application. Thus, if these modifications and variations of the present application fall within the scope of the claims of the present application and their equivalent technologies, the present application is also intended to include these changes and modifications.

Claims

1. An optical transmission device, characterized in that, Including: A first optical fiber line protection circuit, a second optical fiber line protection circuit, and a control circuit; The first optical fiber line protection circuit is used to connect to a working optical fiber line through a first interface circuit, and the first optical fiber line protection circuit is further used to connect to a protection optical fiber line through a second interface circuit; The second optical fiber line protection circuit is used to connect to the working optical fiber line through the first interface circuit, and the second optical fiber line protection circuit is further used to connect to the protection optical fiber line through the second interface circuit; Wherein, the first optical fiber line protection circuit and the second optical fiber line protection circuit are connected to the control circuit; The control circuit is used to control the first optical fiber line protection circuit to switch from receiving an optical signal of a first band from the working optical fiber line to receiving the optical signal of the first band from the protection optical fiber line, and control the second optical fiber line protection circuit to switch from receiving an optical signal of a second band from the working optical fiber line to receiving the optical signal of the second band from the protection optical fiber line, and the first band and the second band have different wavelength ranges.

2. The optical transmission device according to claim 1, wherein The control circuit is further used to receive a first detection result sent by the first optical fiber line protection circuit based on the working optical fiber line and the protection optical fiber line, and the first detection result is used to indicate that the optical signal of the first band is abnormally transmitted along the working optical fiber line, and the optical signal of the first band is normally transmitted along the protection optical fiber line; The control circuit is specifically used to control the first optical fiber line protection circuit to receive the optical signal of the first band from the protection optical fiber line based on the first detection result.

3. The optical transmission device according to claim 1, wherein The control circuit is further used to receive a second detection result sent by the first optical fiber line protection circuit based on the working optical fiber line and the protection optical fiber line, and the second detection result is used to indicate that the optical signal of the first band is abnormally transmitted along the working optical fiber line, and the optical signal of the first band is abnormally transmitted along the protection optical fiber line; The control circuit is specifically used to control the first optical fiber line protection circuit to receive the optical signal of the first band from the working optical fiber line based on the second detection result.

4. The optical transmission device according to claim 2, wherein The control circuit is further used to receive a third detection result sent by the second optical fiber line protection circuit based on the working optical fiber line and the protection optical fiber line, and the third detection result is used to indicate that the optical signal of the second band is normally transmitted along the working optical fiber line, and the optical signal of the second band is normally transmitted along the protection optical fiber line; The control circuit is further used to control the second optical fiber line protection circuit to receive the optical signal of the second band from the protection optical fiber line in response to the third detection result.

5. The optical transmission device according to claim 2 or 3, wherein The control circuit is further configured to receive a fourth detection result sent by the second optical fiber line protection circuit based on the working optical fiber line and the protection optical fiber line, where the fourth detection result is used to indicate that the optical signal in the second wavelength band is transmitted normally along the working optical fiber line, and the optical signal in the second wavelength band is transmitted abnormally along the protection optical fiber line; The control circuit is further configured to control the second optical fiber line protection circuit to receive the optical signal in the second wavelength band from the working optical fiber line in response to the fourth detection result.

6. The optical transmission device according to claim 3, wherein The control circuit is further configured to receive a fifth detection result sent by the second optical fiber line protection circuit based on the working optical fiber line and the protection optical fiber line, where the fifth detection result is used to indicate that the optical signal in the second wavelength band is transmitted normally along the working optical fiber line, and the optical signal in the second wavelength band is transmitted normally along the protection optical fiber line; The control circuit is further configured to control the second optical fiber line protection circuit to receive the optical signal in the second wavelength band from the working optical fiber line in response to the fifth detection result.

7. The optical transmission device according to claim 1, wherein The control circuit is further configured to receive a sixth detection result sent by the second optical fiber line protection circuit based on the working optical fiber line and the protection optical fiber line, where the sixth detection result is used to indicate that the optical signal in the second wavelength band is transmitted abnormally along the working optical fiber line, and the optical signal in the second wavelength band is transmitted normally along the protection optical fiber line; The control circuit is further configured to control the second optical fiber line protection circuit to receive the optical signal in the second wavelength band from the protection optical fiber line in response to the sixth detection result.

8. The optical transmission device according to claim 1, wherein The control circuit is further configured to receive a seventh detection result sent by the second optical fiber line protection circuit based on the working optical fiber line and the protection optical fiber line, where the seventh detection result is used to indicate that the optical signal in the second wavelength band is transmitted abnormally along the working optical fiber line, and the optical signal in the second wavelength band is transmitted abnormally along the protection optical fiber line; The control circuit is further configured to control the second optical fiber line protection circuit to receive the optical signal in the second wavelength band from the working optical fiber line in response to the seventh detection result.

9. The optical transmission device according to claim 7, wherein The control circuit is further configured to receive an eighth detection result sent by the first optical fiber line protection circuit based on the working optical fiber line and the protection optical fiber line, where the eighth detection result is used to indicate that the optical signal in the first wavelength band is transmitted normally along the working optical fiber line, and the optical signal in the first wavelength band is transmitted normally along the protection optical fiber line; The control circuit is specifically configured to control the first optical fiber line protection circuit to receive the optical signal in the first wavelength band from the protection optical fiber line based on the eighth detection result.

10. The optical transmission device according to claim 7 or 8, wherein The control circuit is further configured to receive a ninth detection result sent by the first optical fiber line protection circuit based on the working optical fiber line and the protection optical fiber line, where the ninth detection result is used to indicate that the optical signal in the first band is transmitted normally along the working optical fiber line, and the optical signal in the first band is transmitted abnormally along the protection optical fiber line; Specifically, the control circuit is configured to control the first optical fiber line protection circuit to receive the optical signal in the first band from the working optical fiber line based on the ninth detection result.

11. The optical transmission device according to claim 8, wherein The control circuit is further configured to receive a tenth detection result sent by the first optical fiber line protection circuit based on the working optical fiber line and the protection optical fiber line, where the tenth detection result is used to indicate that the optical signal in the first band is transmitted normally along the working optical fiber line, and the optical signal in the first band is transmitted normally along the protection optical fiber line; Specifically, the control circuit is configured to control the first optical fiber line protection circuit to receive the optical signal in the first band from the working optical fiber line based on the tenth detection result.

12. The optical transmission device according to claim 1, wherein The control circuit is further configured to receive an eleventh detection result sent by the first optical fiber line protection circuit based on the working optical fiber line and the protection optical fiber line, where the eleventh detection result is used to indicate that the optical signal in the first band is transmitted normally along the working optical fiber line, and the optical signal in the first band is transmitted normally along the protection optical fiber line; Specifically, the control circuit is configured to control the first optical fiber line protection circuit to receive the optical signal in the first band from the working optical fiber line based on the eleventh detection result.

13. The optical transmission device according to claim 1, wherein The control circuit is further configured to receive a twelfth detection result sent by the first optical fiber line protection circuit based on the working optical fiber line and the protection optical fiber line, where the twelfth detection result is used to indicate that the optical signal in the first band is transmitted normally along the working optical fiber line, and the optical signal in the first band is transmitted abnormally along the protection optical fiber line; Specifically, the control circuit is configured to control the first optical fiber line protection circuit to receive the optical signal in the first band from the working optical fiber line based on the twelfth detection result.

14. The optical transmission device according to claim 12, wherein The control circuit is further configured to receive a thirteenth detection result sent by the second optical fiber line protection circuit based on the working optical fiber line and the protection optical fiber line, where the thirteenth detection result is used to indicate that the optical signal in the second band is transmitted normally along the working optical fiber line, and the optical signal in the second band is transmitted normally along the protection optical fiber line; The control circuit is further configured to control the second optical fiber line protection circuit to receive the optical signal in the second band from the working optical fiber line in response to the thirteenth detection result.

15. The optical transmission device according to claim 12, wherein The control circuit is further configured to receive a fourteenth detection result sent by the second optical fiber line protection circuit based on the working optical fiber line and the protection optical fiber line, where the fourteenth detection result is used to indicate that the optical signal in the second wavelength band is abnormally transmitted along the working optical fiber line, and the optical signal in the second wavelength band is normally transmitted along the protection optical fiber line; The control circuit is further configured to control the second optical fiber line protection circuit to receive the optical signal in the second wavelength band from the protection optical fiber line in response to the fourteenth detection result.

16. The optical transmission device according to claim 13, wherein The control circuit is further configured to receive a fifteenth detection result sent by the second optical fiber line protection circuit based on the working optical fiber line and the protection optical fiber line, where the fifteenth detection result is used to indicate that the optical signal in the second wavelength band is abnormally transmitted along the working optical fiber line, and the optical signal in the second wavelength band is abnormally transmitted along the protection optical fiber line; The control circuit is further configured to control the second optical fiber line protection circuit to receive the optical signal in the second wavelength band from the protection optical fiber line in response to the fifteenth detection result.

17. The optical transmission device according to claim 1, wherein The control circuit is further configured to receive a sixteenth detection result sent by the second optical fiber line protection circuit based on the working optical fiber line and the protection optical fiber line, where the sixteenth detection result is used to indicate that the optical signal in the second wavelength band is normally transmitted along the working optical fiber line, and the optical signal in the second wavelength band is normally transmitted along the protection optical fiber line; The control circuit is further configured to control the second optical fiber line protection circuit to receive the optical signal in the second wavelength band from the working optical fiber line in response to the sixteenth detection result.

18. The optical transmission device according to claim 1, wherein The control circuit is further configured to receive a seventeenth detection result sent by the second optical fiber line protection circuit based on the working optical fiber line and the protection optical fiber line, where the seventeenth detection result is used to indicate that the optical signal in the second wavelength band is normally transmitted along the working optical fiber line,and the optical signal in the second wavelength band is abnormally transmitted along the protection optical fiber line; The control circuit is further configured to control the second optical fiber line protection circuit to receive the optical signal in the second wavelength band from the working optical fiber line in response to the seventeenth detection result.

19. The optical transmission device according to claim 17,wherein The control circuit is further configured to receive an eighteenth detection result sent by the first optical fiber line protection circuit based on the working optical fiber line and the protection optical fiber line, where the eighteenth detection result is used to indicate that the optical signal in the first wavelength band is normally transmitted along the working optical fiber line, and the optical signal in the first wavelength band is normally transmitted along the protection optical fiber line; The control circuit is specifically configured to control the first optical fiber line protection circuit to receive the optical signal in the first wavelength band from the working optical fiber line based on the eighteenth detection result.

20. The optical transmission device according to claim 17, wherein The control circuit is further configured to receive a nineteenth detection result sent by the first optical fiber line protection circuit based on the working optical fiber line and the protection optical fiber line, where the nineteenth detection result is used to indicate that the optical signal in the first band is abnormally transmitted along the working optical fiber line, and the optical signal in the first band is normally transmitted along the protection optical fiber line; The control circuit is specifically configured to control the first optical fiber line protection circuit to receive the optical signal in the first band from the protection optical fiber line based on the nineteenth detection result.

21. The optical transmission device according to claim 18, wherein The control circuit is further configured to receive a twentieth detection result sent by the first optical fiber line protection circuit based on the working optical fiber line and the protection optical fiber line, where the twentieth detection result is used to indicate that the optical signal in the first band is abnormally transmitted along the working optical fiber line, and the optical signal in the first band is abnormally transmitted along the protection optical fiber line; The control circuit is specifically configured to control the first optical fiber line protection circuit to receive the optical signal in the first band from the protection optical fiber line based on the twentieth detection result.

22. The optical transmission device according to any one of claims 1-21, characterized in that, The first band is: 1530 nanometers to 1565 nanometers; the second band is: 1565 nanometers to 1625 nanometers.

23. An optical network, characterized in that, Comprising at least one optical add-drop multiplexer, and an optical transmission device according to any one of claims 1-22 connected to the optical add-drop multiplexer.

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