激光强度起伏及相位噪声对光学双频探测的影响

发布时间：2018-05-20 04:10

本文选题：测量 + 双频激光探测　；参考：《光学学报》2016年12期

【摘要】：针对利用光纤延时自差系统获得双频拍频光的方法,建立了激光源强度起伏和相位噪声对拍频光功率谱影响的理论模型,并基于该模型进行了数值分析和模拟。结果表明,短延时差比长延时差更有利于减小激光器的噪声干扰。当延时差小于激光相干时间时,激光线宽越大,强度起伏越大,信号的信噪比越低。当延时差远大于激光相干时间时,激光器的相位噪声成为拍频光信号展宽的主要来源,且相位噪声越大,拍频光信号功率越小;强度起伏也有一定的展宽效应,但对于拍频信号功率有增大作用。在长延时情况下,拍频光信号功率和线宽随两个频率光的延时差呈余弦规律变化,存在最佳工作点。
[Abstract]:A theoretical model of the influence of intensity fluctuation of laser source and phase noise on the power spectrum of beat light is established, and the numerical analysis and simulation are carried out based on the method of obtaining dual-frequency beat frequency light by using optical fiber delay self-aberration system. The results show that the short delay difference is better than the long delay difference in reducing the noise interference of the laser. When the delay difference is less than the laser coherence time, the larger the laser linewidth, the greater the intensity fluctuation, and the lower the signal-to-noise ratio of the signal. When the delay difference is far greater than the laser coherent time, the phase noise of the laser becomes the main source of the broadening of the beat light signal, and the larger the phase noise, the smaller the power of the beat light signal, and the more the intensity fluctuation has the effect of broadening. But it can increase the power of beat signal. In the case of long delay, the power and linewidth of beat light signal vary with cosine law with the delay difference of two frequency light, and there is an optimum working point.
【作者单位】：北京理工大学光电学院;精密光电测试仪器及技术北京市重点实验室;
【基金】：国家自然科学基金(61275053)
【分类号】：TN24

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