CN-121984582-A - Signal processing method and related device and system

Abstract

The embodiment of the application discloses a signal processing method, and a related device and system. The first optical signal sent by the sending device to the receiving device is a multi-wavelength signal, and after the first optical signal is transmitted through a channel, an interference signal may be generated due to the FWM phenomenon. The receiving device receives a second optical signal transmitted by the first optical signal through the channel, and detects the second optical signal to determine whether an interference signal generated by the FWM exists. Then, the receiving apparatus may transmit the first frame to the transmitting apparatus according to the detection result of the second optical signal, so that the transmitting apparatus determines whether to adjust the wavelength of the first optical signal according to the first frame. It should be understood that if the detection result of the second optical signal indicates that there is an interference signal generated by the FWM, the first frame is used to instruct the transmitting end to adjust the wavelength of the first optical signal so as to change the phase matching condition of the FWM, thereby avoiding the occurrence of the FWM phenomenon, which is beneficial to improving the system performance.

Inventors

• TIAN YU
• LIAO HAO
• XIN HAIYUN

Assignees

• 华为技术有限公司

Dates

Publication Date

20260505

Application Date

20241031

Claims (20)

1. 1. A signal processing method, comprising: Receiving a second optical signal transmitted by a first optical signal transmitted by a transmitting device through a channel, wherein the first optical signal comprises optical signals with a plurality of wavelengths; Detecting the second optical signal to determine whether an interference signal generated by four-wave mixing FWM exists; And sending a first frame to the sending device according to the detection result of the second optical signal, so that the sending device determines whether to adjust the wavelength of the first optical signal according to the first frame.
2. 2. The method of claim 1, wherein the first frame is a data frame comprising traffic data and a preset bit for indicating whether the transmitting device adjusts the wavelength of the first optical signal.
3. 3. The method of claim 2, wherein the data frame comprises a forward error correction, FEC, codeword comprising the traffic data and check bits.
4. 4. The method of claim 3 wherein each 8704 of said FEC codewords in said data frame comprises 1024 of said preset bits.
5. 5. The method of claim 1, wherein the first frame is a training frame, and wherein at least one bit in a control field and/or a status field in the training frame is used to indicate whether the transmitting device adjusts a wavelength of the first optical signal.
6. 6. The method of claim 1, wherein the first frame is a negotiation frame, and wherein at least one bit in a base page and/or an extended page of the negotiation frame is used to indicate whether the transmitting device adjusts a wavelength of the first optical signal.
7. 7. The method according to any one of claims 1 to 6, wherein the first frame is used to instruct the transmitting device to maintain the wavelength of the first optical signal if the detection result of the second optical signal is that the interfering signal is not present.
8. 8. The method according to any one of claims 1 to 6, wherein if the detection result of the second optical signal is that the interference signal is present, the first frame is used to instruct the transmitting device to adjust the wavelength of the first optical signal.
9. 9. The method of claim 8, wherein the first frame is used to instruct the transmitting device to adjust the wavelengths of all or a portion of the optical signals in the first optical signal.
10. 10. The method according to claim 8 or 9, wherein the first frame is used to instruct the transmitting apparatus to step up the wavelength of the first optical signal according to the wavelength adjustment accuracy, or the first frame is used to instruct the transmitting apparatus to step down the wavelength of the first optical signal according to the wavelength adjustment accuracy.
11. 11. The method according to any of claims 8 to 10, wherein the first frame is used to instruct the transmitting device to adjust the wavelength of the first optical signal within a wavelength scanning range.
12. 12. The method according to any one of claims 8 to 11, wherein after transmitting the first frame to the transmitting device, the method further comprises: receiving a fourth optical signal transmitted by the third optical signal through a channel, wherein the third optical signal is obtained by adjusting the wavelength of the first optical signal by the transmitting device; detecting the fourth optical signal to determine whether the interference signal exists; And if the detection result of the fourth optical signal is that the interference signal does not exist, sending a second frame to the sending equipment, wherein the second frame is used for indicating the sending equipment to stop adjusting the wavelength of the first optical signal.
13. 13. The method according to any one of claims 8 to 11, wherein after transmitting the first frame to the transmitting device, the method further comprises: Sequentially receiving a plurality of fourth optical signals transmitted by the transmission equipment through channels, wherein the plurality of third optical signals are obtained by the transmission equipment traversing the wavelength scanning range to adjust the wavelength of the first optical signals; sequentially detecting the plurality of fourth optical signals to determine fourth optical signals without interference signals in the plurality of fourth optical signals; determining a target wavelength adjustment amount from the wavelength adjustment amounts corresponding to the fourth optical signals without the interference signals; and sending a second frame to the sending device, wherein the second frame is used for instructing the sending device to adjust the wavelength of the first optical signal according to the target wavelength adjustment quantity and then fixing the wavelength.
14. 14. The method of claim 13, wherein there are a plurality of the fourth optical signals without the interference signal, and the target wavelength adjustment amount is a wavelength adjustment amount having a smallest absolute value among wavelength adjustment amounts corresponding to the fourth optical signals without the interference signal.
15. 15. The method of claim 13, wherein the fourth optical signal without the interference signal has a plurality of wavelength adjustment amounts corresponding to the fourth optical signal without the interference signal including at least one wavelength adjustment amount section, the target wavelength adjustment amount being a median within a target wavelength adjustment amount section among the at least one wavelength adjustment amount section, an absolute value of the median within the target wavelength adjustment amount section being a minimum among the median of the at least one wavelength adjustment amount section.
16. 16. The method of any one of claims 1 to 15, wherein detecting the second optical signal comprises: converting the second optical signal into an electrical signal and detecting the electrical signal; And if a target signal with the amplitude larger than a threshold value is detected in the effective frequency range of the electric signal, determining the target signal as the interference signal.
17. 17. The method according to any one of claims 1 to 16, wherein if the detection result of the second optical signal is that the interference signal is present, the first frame is further used to instruct the transmitting device to reduce the light emitting power.
18. 18. A signal processing method, comprising: Transmitting a first optical signal to a receiving device, wherein the first optical signal comprises optical signals with a plurality of wavelengths, and a second optical signal transmitted by the first optical signal through a channel is received and detected by the receiving device; receiving a first frame sent by the receiving device according to a detection result of the second optical signal, wherein the detection result of the second optical signal is used for indicating whether an interference signal generated by four-wave mixing FWM exists or not; and determining whether to adjust the wavelength of the first optical signal according to the first frame.
19. 19. A signal processing device is characterized by comprising a receiving and transmitting unit and a processing unit; The receiving and transmitting unit is used for receiving a second optical signal transmitted by a first optical signal transmitted by a transmitting device through a channel, wherein the first optical signal comprises optical signals with a plurality of wavelengths; The processing unit is used for detecting the second optical signal to determine whether an interference signal generated by four-wave mixing FWM exists or not; The receiving and transmitting unit is used for transmitting a first frame to the transmitting device according to the detection result of the second optical signal, so that the transmitting device determines whether to adjust the wavelength of the first optical signal according to the first frame.
20. 20. A signal processing device is characterized by comprising a receiving and transmitting unit and a processing unit; The receiving and transmitting unit is used for transmitting a first optical signal to receiving equipment, wherein the first optical signal comprises optical signals with a plurality of wavelengths, and a second optical signal transmitted by the first optical signal through a channel is received and detected by the receiving equipment; receiving a first frame sent by the receiving device according to a detection result of the second optical signal, wherein the detection result of the second optical signal is used for indicating whether an interference signal generated by four-wave mixing FWM exists or not; The processing unit is used for determining whether to adjust the wavelength of the first optical signal according to the first frame.

Description

Signal processing method and related device and system Technical Field The present application relates to the field of optical communications, and in particular, to a signal processing method, and related apparatus and system. Background In the optical communication scenario of the alignment check (INTENSITY MODULATION DIRECT DETECTION, IMDD), the cost of fiber nonlinearity introduction is difficult to overcome, and suppression and compensation are generally required by a reasonable system configuration, scheme design or a nonlinear algorithm with higher power consumption, for example, reducing the incident light power, polarization interpolation, non-equidistant wavelengths, and the like. After IMDD short-distance high-speed transmission system is evolved from 2km to 10km, the wavelength scheme is changed from coarse wavelength division multiplexing (coarse wavelength division multiplexing, CWDM) to local area network wavelength division multiplexing (local area network wavelength division multiplexing, lan-WDM) with narrower interval and smaller dispersion amount due to the increase of dispersion cost. Because a plurality of wavelengths are positioned in the range of zero dispersion wavelengths (zero dispersion wavelength, ZDW), and the incident light power is higher, the occurrence probability of the nonlinear four-wave mixing (four wave mixing, FWM) of the optical fiber is greatly increased, and the performance cost of the system is increased, so that the problem to be solved is urgently needed at present. Disclosure of Invention The embodiment of the application provides a signal processing method, a related device and a related system, which can effectively avoid FWM phenomenon and are beneficial to improving system performance. In a first aspect, an embodiment of the present application provides a signal processing method, which is applied to a receiving device. Specifically, the receiving device receives the second optical signal after the first optical signal sent by the sending device is transmitted through the channel. The first optical signal includes optical signals with multiple wavelengths, and the first optical signal may be subjected to noise or other interference when transmitted through a channel, for example, a four-wave mixing (four wave mixing, FWM) phenomenon occurs in the transmission of the first optical signal in the channel, so that an interference signal is formed, and thus, noise or other interference may be increased by the second optical signal compared to the first optical signal. Thereafter, the receiving device detects the second optical signal to determine whether there is an interference signal due to the FWM. Further, the receiving apparatus transmits the first frame to the transmitting apparatus according to the detection result of the second optical signal, so that the transmitting apparatus determines whether to adjust the wavelength of the first optical signal according to the first frame. In this embodiment, the receiving device may specifically determine, according to a detection result of the received second optical signal, information that needs to be fed back to the sending device, so that the sending device may learn, in real time, a transmission quality of the current optical signal, thereby being beneficial to maintaining better system performance for different scenarios. If the detection result of the second optical signal indicates that there is no interference signal due to FWM, the receiving apparatus should inform the transmitting apparatus to maintain the wavelength of the first optical signal currently transmitted. If the detection result of the second optical signal indicates that there is an interference signal generated by the FWM, the receiving device should inform the transmitting device to adjust the wavelength of the first optical signal currently transmitted so as to change the phase matching condition of the FWM, thereby avoiding the occurrence of the FWM phenomenon and being beneficial to improving the system performance. In some possible embodiments, the first frame is a data frame, the data frame including traffic data and a preset bit for indicating whether the transmitting device adjusts a wavelength of the first optical signal. In the embodiment, the receiving device can carry the information needing to be fed back by utilizing the data frame sent to the sending device in the service transmission stage, and the information feedback is realized on the premise of not influencing the service transmission, so that the method has a better practical effect. And the preset bits reserved in the data frame are utilized to carry information needing to be fed back, the data frame is not required to be additionally expanded, and the realization cost is low. In some possible implementations, the data frame includes a forward error correction (forward error correction, FEC) codeword that includes traffic data and check bits. That is, the service data