Method and system for detecting spectrum of undersea cable system

Abstract

The present application discloses determining spectra for a subsea cable system. The submarine cable system includes an undersea cable with optical repeaters at intervals. Factory spectrum test data o

Claims

1. A method for detecting spectrum of an undersea cable system applied to the undersea cable system, comprising a plurality of sites configured to receive and transmit optical signals, an undersea cable provided between the plurality of sites to communicate with the plurality of sites, and a plurality of optical repeaters respectively disposed on the undersea cable to amplify the optical signals transmitted by the sites, wherein the method comprises:acquiring first spectrum test data of the plurality of the optical repeaters and second spectrum test data of the undersea cable; the first spectrum test data comprises factory spectrum test data of each of the optical repeaters, and the second spectrum test data comprises intrinsic Raman spectrum data of the undersea cable;acquiring a spectrum baseline corresponding to each of the optical repeaters according to each of the first spectrum test data and the second spectrum test data; the spectrum baseline comprising an input spectrum and an output spectrum of each of the optical repeaters after the undersea cable system inputs an optical signal of a pre-set power;acquiring a gain variation model corresponding to each of the optical repeaters according to each of the first spectrum test data; the gain variation model comprising gain data of the optical repeater for optical signals of different wavelengths and / or different powers, wherein the gain variation model is a model which models how power versus wavelength spectra vary depending on a power offset of input power to the subsea cable system, from a nominal value;monitoring the undersea cable system to obtain power variation data; andcalculating a first gain spectrum from the power variation data, the spectrum baseline, and the gain variation model; the first gain spectrum comprising an input spectrum and an output spectrum of each of the optical repeaters after a power variation of an optical signal in the undersea cable system.

2. The method according to claim 1, wherein the acquiring a spectrum baseline corresponding to each of the optical repeaters according to each of the first spectrum test data and the second spectrum test data comprises:acquiring a wavelength range of an input optical signal of the undersea cable15 08 25system and power information corresponding to different wavelength signals;acquiring a loss spectrum of the undersea cable to the input optical signal and a gain spectrum of each of the optical repeaters to the input optical signal according to the wavelength range and the power information; anddetermining the loss spectrum and the gain spectrum corresponding to the input optical signal as the spectrum baseline.

3. The method according to claim 1 or claim 2, wherein the acquiring a gain variation model corresponding to each of the optical repeaters according to each of the first spectrum test data comprises:acquiring gain data of each of the optical repeaters for optical signals of different wavelengths and / or different powers according to the first spectrum test data; anddetermining the gain variation model for each of the optical repeaters based on gain data for each of the optical repeaters.

4. The method according to any of claims 1 to 3, wherein the monitoring the undersea cable system to obtain power variation data comprises:transmitting a first detected light of a single wavelength into the undersea cable system;acquiring a second gain spectrum of the first detected light in the undersea cable system as the power variation data; the second gain spectrum comprising an input spectrum and an output spectrum of the first detected light passing through each of the optical repeaters;the calculating a first gain spectrum from the power variation data, the spectrum baseline, and the gain variation model comprises:acquiring a gain difference between the second gain spectrum and the spectrum baseline if the second gain spectrum does not match the spectrum baseline; andcalculating the first gain spectrum from the gain difference and the gain variation model.

5. The method according to claim 4, wherein the acquiring a gain difference between the second gain spectrum and the spectrum baseline if the second gain spectrum does not match the spectrum baseline comprises:15 08 25extracting gain spectrum information in the spectrum baseline; the gain spectrum information comprising an input spectrum and an output spectrum of an optical signal corresponding to a first detection optical wavelength in the spectrum baseline passing through each of the optical repeaters; andcomparing the second gain spectrum with the gain spectrum information to acquire the gain difference.

6. The method according to claim 5, wherein the second gain spectrum comprises a second input spectrum and a second output spectrum, the gain spectrum information comprises an input gain spectrum and an output gain spectrum, the gain difference comprises an input gain difference and an output gain difference, and the comparing the second gain spectrum with the gain spectrum information to acquire the gain difference comprises:calculating a difference between the second input spectrum and the input gain spectrum corresponding to each of the optical repeaters to obtain an input gain difference;calculating a difference between the second output spectrum and the output gain spectrum corresponding to each of the optical repeaters to obtain an output gain difference; andarranging the input gain difference and the output gain difference corresponding to each of the optical repeaters in a transceiving order of each of the optical repeaters to obtain the gain difference.

7. The method according to claim 5 or 6, wherein after the comparing the second gain spectrum with the gain spectrum information to obtain a gain difference, the method further comprises:detecting each of the input gain differences and the output gain differences in the gain differences to obtain first difference data which is greater than a pre-set value or less than the pre-set value;if the first difference data is one of the input gain differences, the fault region of the undersea cable system is the undersea cable connected to an input end of the first optical repeater; the first optical repeater is the optical repeater corresponding to the first difference data;15 08 25if the first difference data is one of the output gain differences, the fault region of the undersea cable system is the first optical repeater.

8. The method according to any of claims 4 to 7, wherein the calculating the first gain spectrum from the gain difference and the gain variation model comprises:determining a second optical repeater in the undersea cable system according to the position of the first optical repeater; the second optical repeater comprises each of the optical repeaters connected to an output end of the first optical repeater through the undersea cable; andcalculating an input spectrum and an output spectrum of each of the second optical repeaters according to the gain difference and the gain variation model corresponding to the second optical repeater to obtain the first gain spectrum.

9. The method according to any preceding claim, wherein the method further comprises, after the calculating the first gain spectrum, displaying the first gain spectrum.

10. A system for detecting spectrum of an undersea cable system for executing the method for detecting spectrum of an undersea cable system according to any one of claims 1 to 9, the spectrum detection system being provided in an undersea cable system, the undersea cable system comprising a plurality of sites configured to receive and transmit optical signals, an undersea cable provided between the plurality of sites to communicate with the plurality of sites, and a plurality of optical repeaters respectively disposed on the undersea cable to amplify the optical signals transmitted by the sites, wherein the system comprises a network management device disposed in one of the sites and connected to the site, and an undersea cable monitoring device connected to the undersea cable, and the network management device is connected to the undersea cable monitoring device, whereinthe network management device comprises:a data acquisition unit configured to acquire first spectrum test data of a plurality of the optical repeaters and second spectrum test data of the undersea cable;a processing and computing unit configured to acquire a spectrum baseline corresponding to each of the optical repeaters according to each of the first spectrum test data and the second spectrum test data;acquire a gain variation model corresponding to each of the optical repeatersaccording to each of the first spectrum test data;the undersea cable monitoring device is configured to monitor the undersea cable system to obtain power variation data; andthe processing and computing unit is further configured to calculate a first gain spectrum from the power variation data, the spectrum baseline, and the gain variation model.

11. The system according to claim 10, wherein the network management device further comprises a spectrum display unit configured to display the first gain spectrum.15 08 25

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