Performance Evaluation Method of Optical Coherent System Based on Laser Frequency Noise Spectrum

Abstract

The invention discloses a method for evaluating the performance of an optical coherent system based on the laser frequency noise spectrum, which includes: based on the frequency domain characteristics of the laser frequency noise, and through the conversion relationship between the phase noise spectrum and the frequency noise spectrum, the phase noise of the received signal of the optical coherent system is obtained Frequency domain information; use the obtained phase noise frequency domain information to construct the autocorrelation characteristics of the phase noise of the received signal under any fiber delay; calculate the autocorrelation information of the received signal according to the obtained autocorrelation characteristics; according to the obtained autocorrelation information , calculate the power spectral density of the received signal of the optical coherent system, and analyze the system performance in four steps. Based on the characteristics of the frequency noise of any laser, this method analyzes its influence on the performance of the optical coherent system, and can accurately measure the influence of the frequency noise of the laser in the optical coherent measurement system under any length of fiber delay. High-precision optical coherent system performance evaluation requirements.

Description

technical field [0001] The present invention relates to the technical field of optical coherent communication system and optical coherent measurement, and more specifically relates to an optical coherent system performance evaluation method based on laser frequency noise spectrum. Background technique [0002] At present, the optical coherent system is widely used in the fields of optical coherent communication, optical coherent detection and optical sensing due to its high sensitivity, many measurable objects, anti-radiation, and anti-electromagnetic interference. An important factor affecting the performance of an optical coherent system is the laser spectral purity, or the intrinsic phase noise of the laser. Generally, there are two methods for evaluating the intrinsic phase noise of lasers: laser spectral linewidth and laser frequency noise spectrum, and the latter can provide more noise information in the frequency domain than the former. [0003] When the existing lin...

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Problems solved by technology

[0005] In view of this, the present invention provides a method for evaluating the performance of an optical coherent system based on the laser frequency noise spectrum, which can accurately evaluate the impact of a laser with arbitrary frequency noise characteristics on the optical coherent system, and solves the problem of optical coherence based on linewidth. Problems with limited accuracy of system performance analysis methods

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