Optical coherence system performance evaluation method based on laser frequency noise spectrum

Abstract

The invention discloses an optical coherence system performance evaluation method based on a laser frequency noise spectrum, and the method comprises the steps: obtaining the phase noise frequency domain information of an optical coherence system receiving signal through the conversion relation between a phase noise spectrum and a frequency noise spectrum based on the frequency domain characteristics of laser frequency noise; using the obtained phase noise frequency domain information to construct the autocorrelation characteristic of the phase noise of the received signal under any optical fiber delay; calculating autocorrelation information of the received signal according to the obtained autocorrelation characteristics; and calculating the power spectral density of the received signal of the optical coherence system according to the obtained autocorrelation information, and analyzing the system performance. According to the method, the influence of any laser frequency noise characteristic on the performance of the optical coherence system is analyzed, the influence of the laser frequency noise in the optical coherence measurement system can be accurately measured under the optical fiber delay of any length, the obtained analysis result is accurate and reliable, and the performance evaluation requirement of the high-precision optical coherence system can be better met.

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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