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基于马赫-曾德尔(Mach-Zehnder)干涉仪结构,构造了全保偏光纤传感系统,以单频窄线宽保偏光纤激光器作为光源,采用了光源光电负反馈和双光路平衡检测双重降噪方法,降低了光源的附加强度噪声,使系统信噪比(SNR)提高了约15 dB,达到60 dB。
Based on the Mach-Zehnder interferometer structure, a fully-preserved polarization fiber sensing system is constructed. The single-frequency narrow-linewidth polarization-maintaining fiber laser is used as the light source. The photoelectric negative feedback of the light source and the dual-optical path balance detection Noise method reduces the additional intensity noise of the light source and improves the system signal-to-noise ratio (SNR) by about 15 dB to 60 dB.