干涉测量
相位噪声
光学
迈克尔逊干涉仪
相对强度噪声
噪音(视频)
话筒
激光线宽
物理
激光器
噪声功率
光纤
噪声测量
材料科学
声学
降噪
半导体激光器理论
功率(物理)
计算机科学
声压
量子力学
人工智能
图像(数学)
作者
Junpeng Zhao,Chen Zhao,Baichao Zheng,Yong Yang,Xuefeng Wang
摘要
In order to reduce the phase noise introduced by the unbalanced interferometer in the distributed feedback (DFB) fiber microphone modulation system, a phase noise compensation method based on a stable laser source as an optical reference is proposed. The narrow linewidth laser source is incident on the unbalanced Michelson interferometer shared by the microphone, so that it has the same optical path difference. This optical phase noise information is used to offset the noise introduced by the interferometer, so as to achieve the purpose of noise suppression. The principle of the unbalanced interferometer composition and suppression are theoretically analyzed and experimentally verified. The experimental results show that under the quiet conditions of the laboratory, compared with the structure that has not been suppressed, the noise of the microphone primitive is reduced from about ± 0.2rad to within ± 0.04rad, the power spectral density is reduced to less than -58.95dB/Hz1/2. It can be suppressed by more than 32dB at the noise peak, and the suppression effect of the phase noise is very obvious.
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