Modulation format identification and optical signal to noise ratio monitoring method for coherent optical communication system

Abstract

The invention discloses a modulation format identification and optical signal to noise ratio monitoring method for a coherent optical communication system, comprising: receiving signals Ex and Ey on two polarization states, performing dispersion compensation on the two signals, and using a constant modulus algorithm to perform signal pre-equalization to obtain the pre-equalized signals E'x and E'y; mapping the signals E'x and E'y to the Stokes space to obtain their statistical distributions S1d and S2d in the S1 and S2 vector directions respectively, performing first derivation on the fitted curves of the S1d and S2d to obtain feature enhancement signals S'1 and S'2 of different modulation format signals and different optical signal to noise ratio signals; training the feature enhancementsignals S'1 and S'2 based on the neural network of DNN algorithm, extracting the feature information of different modulation formats and different optical signal to noise ratio signals, and identifying the coherent optical communication quenching and tempering format and monitoring the optical signal to noise ratio signals according to the information. The invention may realize signal modulation format identification and optical signal to noise ratio monitoring simultaneously by using a single digital signal processing module without changing the configuration of the coherent receiver.

Description

technical field [0001] The invention belongs to the technical field of optical fiber communication, and in particular relates to a modulation format identification and optical signal-to-noise ratio monitoring method of a coherent optical communication system. Background technique [0002] In recent years, coherent light detection and digital signal processing technologies have promoted the continuous growth of the capacity and transmission distance of optical fiber communication systems. At the same time, optical network construction will become more dynamic, complex, transparent, flexible and reconfigurable. Link impairments experienced by signals in future long-distance, high-capacity, dynamic and reconfigurable optical fiber communication systems will exhibit dynamic characteristics. Real-time and accurate link characteristic monitoring technology is the key to maximize the use of existing system resources to achieve the maximum capacity and longest distance reliable tra...

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Problems solved by technology

[0005] The purpose of the present invention is to address the above-mentioned deficiencies in the prior art, and provide a coherent optical communication system modulation format identification and optical signal-to-noise ratio monitoring method to solve the problem that the prior art only has a single function of OSNR monitoring or modulation format identification

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