CN-119254310-B - C+L transmission system noise wave automatic filling method and device

CN119254310BCN 119254310 BCN119254310 BCN 119254310BCN-119254310-B

Abstract

The application discloses a C+L transmission system noise wave automatic filling method and a device, which relate to the technical field of optical communication, wherein the C+L transmission system noise wave automatic filling method comprises the following steps of starting an optical channel to monitor OCM scanning if the power of an optical amplifier at a downstream site of a C+L transmission system is abnormal, and acquiring the frequency and power information of a missing channel; based on the missing channel frequency and power information, automatic filling of noise waves is initiated. The application can make the C+L transmission system maintain the stability of the service channel in the dynamic process.

Inventors

GONG HAOMIN
YANG XIANZHI
YANG XINJIAN
WANG HUIYI
SU XING
ZHOU HONG
LUO SHA
LI WENYU
WANG JUNQI

Assignees

烽火通信科技股份有限公司

Dates

Publication Date: 20260508
Application Date: 20240918

Claims (4)

1. The automatic filling method of the C+L transmission system noise wave is characterized by comprising the following steps of: If the power of the optical amplifier of the downstream site of the C+L transmission system is abnormal, starting an optical channel to monitor OCM scanning, and obtaining the frequency and power information of the missing channel; Starting automatic filling of noise waves based on the frequency and power information of the missing channels; The power abnormality of the optical amplifier comprises that the optical amplifier generates an input light loss alarm or generates output power mutation; if the power of the optical amplifier of the downstream station of the c+l transmission system is abnormal, then starting the optical channel monitoring OCM scanning to obtain the frequency and power information of the missing channel, including: when the power of the optical amplifier is monitored to be approaching to 0, prompting an input light loss alarm, and judging that the optical fiber is interrupted; When the power burst of the optical amplifier is monitored to be larger or smaller but not 0, judging that the service channel is lost; Starting OCM scanning, detecting channels in the full bandwidth of C+L and distinguishing the power and the center frequency of the channels; comparing the acquired center frequency of the channel with the preset full-channel center frequency, and if the missing exists, recording the frequency and power information of the missing channel.
2. The c+l transmission system noise wave automatic filling method of claim 1, wherein the starting the automatic filling of the noise wave based on the missing channel frequency and power information comprises: based on the frequency and power information of the missing channel, opening the corresponding wavelength center frequency and bandwidth at the port of the wave combining optical device, and setting channel attenuation to match the frequency and power of the traffic channel before loss.
3. The c+l transmission system noise wave automatic filling method according to claim 1, further comprising, after the automatic filling of noise waves is started based on the missing channel frequency and power information: sending a query confirmation command to the optical amplifier, and judging whether the input light loss alarm or the output power mutation of the optical amplifier is recovered to a state before failure; and switching back to the port before the fault after the recovery is received, performing OCM scanning, stopping noise wave filling if the channel power is normal, and continuing to perform noise wave filling if the channel power is abnormal.
4. The utility model provides a C+L transmission system noise wave automatic filling device which characterized in that, C+L transmission system noise wave automatic filling device includes: The detection module is used for starting an optical channel to monitor OCM scanning if the power of an optical amplifier of a downstream site of the C+L transmission system is abnormal, and acquiring the frequency and power information of a missing channel; a filling module that initiates automatic filling of noise waves based on the missing channel's frequency and power information; The power abnormality of the optical amplifier comprises that the optical amplifier generates an input light loss alarm or generates output power mutation; The detection module is used for starting an optical channel to monitor OCM scanning if the power of an optical amplifier of a downstream station of the C+L transmission system is abnormal, and obtaining the frequency and power information of the missing channel, and comprises the following steps: when the power of the optical amplifier is monitored to be approaching to 0, prompting an input light loss alarm, and judging that the optical fiber is interrupted; When the power burst of the optical amplifier is monitored to be larger or smaller but not 0, judging that the service channel is lost; Starting OCM scanning, detecting channels in the full bandwidth of C+L and distinguishing the power and the center frequency of the channels; comparing the acquired center frequency of the channel with the preset full-channel center frequency, and if the missing exists, recording the frequency and power information of the missing channel.

Description

C+L transmission system noise wave automatic filling method and device Technical Field The application relates to the technical field of optical communication, in particular to a C+L transmission system noise wave automatic filling method and device. Background With the continuous increase of network traffic, higher requirements are also put forward on the transmission rate and transmission performance of a transmission network, in recent years, the expansion of the use frequency spectrum of an optical fiber to improve the single-fiber capacity is the most effective way to solve the annual increase of network traffic, the current optical transmission system is already expanded from the traditional C-wave 80/96-wave system to the 120-wave system, the application range of the C-wave band frequency spectrum is continuously widened in the industry, and the improvement of the transmission capacity and the transmission distance is realized. However, with the continuous emergence of technologies such as 5G, cloud technology and big data, especially the high load growth of DCI traffic, a higher demand is put on transmission capacity, and the optical spectrum needs to be further expanded to the c+l band. Particularly, with the maturation of 400G long-range transmission technology, if the transmission capacity of 80 waves needs to be satisfied in 400G QPSK and 400G PCS-16QAM code types, the occupied channel interval is larger (not smaller than 80 x 100 ghz), the available spectrum bandwidth needs to be continuously expanded on the basis of the C-band, the optical spectrum resources of the L-band are utilized to form a c+l optical system, if the 80 wave wavelength needs to be continuously maintained, as shown in fig. 1, the c96+l96 wave band spectrum is required for 400GPCS-16QAM code types, and the c120+l120 wave band spectrum is required for 400G QPSK code types. The silica fiber has a broad SRS (Stimulated RAMAN SCATTERING ) gain spectrum and a broad gain peak around about 13THz (100 nm) at the pump frequency down shift. If a weak signal and a strong pump light wave are transmitted in the optical fiber at the same time, and the wavelength of the weak signal is placed in the Raman gain bandwidth of the pump light, the weak signal light can be amplified. In a c+l band transmission system, the L band is just within the raman gain spectrum of the C band, which causes the energy of the C band signal to be transferred to the L band, resulting in a large power difference, as shown in fig. 2. The SRS effect causes more pronounced short wave power degradation than the pure C band with increased wavenumbers and broader bands. Therefore, in the c+l spectrum expansion scheme, the SRS effect is suppressed by using the SRS control technique, which is one of key techniques for ensuring the system performance. In a C+L transmission system, for a common single-mode fiber span with the length of about 60-100 km, the equalization and the consistency of average OSNR (optical fiber to noise ratio) can be realized only by taking the difference of fiber attenuation coefficients and the effect of SRS (sounding reference signal) power transfer into consideration, wherein the average power of the common single-mode fiber span is about 1-1.5 dB greater than that of the common single-mode fiber in the whole C-band transmission system. This means that if the conventional capacity expansion mode is adopted, that is, only the service channel required for each capacity expansion is used, then each time the service expansion is performed, system optimization, that is, configuration adjustment of the entire line system, needs to be performed once, as shown in fig. 3. This is a great challenge for the stability of the whole system, since the process of system optimization will have some impact on the wavelength of the original traffic. The optical layer line system is kept in a full wave operation state at the beginning of service opening by adopting a noise wave filling mode and continuously in the whole life cycle process, when the service channels are required to be expanded, the system can be kept in a relatively stable state all the time by closing one filling channel in sequence to call one service channel with the same wavelength, and the influence of SRS change on the existing service caused by increasing or decreasing the service is avoided. As shown in fig. 4, (solid lines in the figure are true traffic waves, and broken lines are noise waves). However, the static noise wave filling can only make the system relatively stable, and the optical transmission line and the system are always absolutely dynamic, and if the noise wave filling is not performed on the lost channel in time, the rest channels can still be influenced. Disclosure of Invention The application provides a method and a device for automatically filling noise waves of a C+L transmission system, which can ensure that the C+L transmission system maintains the stability of a serv