Method and system for identifying optical signal modulation format

Abstract

The invention relates to a method and system for identifying a modulation format based on optical signals in the field of optical fiber communication. The method includes the steps that a TDC exerts certain dispersion values on input optical signals to be identified and then outputs the optical signals, after passing through an optical amplifier, the optical signals are injected into a non-linear power transfer function NPTF generating module, and a optical power meter measures signal average power of the output end of the non-linear power transfer function NPTF generating module; a control and digital signal processing module drives the TDC to generate a series of dispersion values and records each dispersion value and the signal average power, corresponding to each dispersion value, of the output end of the NPTF generating module, and the dispersion values and corresponding signal average power are stored as a dispersion-signal average power measured value array. Matching is carried out among various dispersion-signal average power samples with known modulation format signals and the dispersion-signal average power measured value array, and the modulation format of the best matched sample is discriminated as the modulation format of the input signals. The method and system for identifying the optical signal modulation format does not need any prior information at work, is suitable for signals with various modulation formats and speed and has the advantages of being simple in structure and high in cost performance.

Description

technical field [0001] The invention relates to the technical fields of optical fiber communication, all-optical signal and digital signal processing. Background technique [0002] The ultimate goal of communication is to achieve fast, effective, safe and accurate transmission of information. Due to the limitation of channel capacity, communication signals need to adopt different modulation methods to meet different needs of users. With the rapid development of modern communication technology, the modulation methods in the communication system tend to be diversified and complicated. The identification of the modulation mode of the communication signal is an important part of the field of interception signal processing. It needs to determine the modulation mode of the received signal and extract the corresponding modulation mode under the condition of complex environment and noise interference without relying on other prior knowledge. Parameters to provide a basis for furth...

AI Technical Summary

Problems solved by technology

This method can automatically identify six commonly used optical modulation formats, including some advanced modulation formats, and is not sensitive to OSNR, chromatic dispersion (CD) and polarization mode dispersion (PMD) degradation within a certain range, but the method More complex sampling and data algorithms are required, and the training of the ANN network requires a large amount of sample data, and the process is cumbersome

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