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远程传输光纤受环境的影响会在水听器系统中引入噪声,利用迈克耳孙光纤干涉仪模拟光纤水听器,搭建了远程光纤水听器系统,采用参考干涉仪法解调对传输光纤引入的噪声进行抑制。实验结果表明,与常用的相位产生载波技术(PGC)解调相比,参考干涉仪法解调在不影响传感水听器对声信号检测能力的情况下,对传输光纤引入的扰动噪声能进行良好的抑制,频率为500 Hz噪声的抑制量可达到约25 d B,同时该方法使传感水听器系统中100 Hz位置的本底噪声也降低了17 d B。
Long-distance transmission of optical fiber by the environment will introduce noise in the hydrophone system, the use of Michelson optical fiber interferometer analog fiber hydrophone, set up a remote optical fiber hydrophone system, the use of reference interferometer demodulation of transmission fiber introduced Of the noise suppression. The experimental results show that compared with the commonly used phase-generated carrier (PGC) demodulation, the demodulation of the reference interferometer does not affect the ability of the sensing hydrophone to detect the acoustic signal, and the disturbance noise energy , The suppression of noise at 500 Hz can reach about 25 d B and the method also reduces the noise floor at 100 Hz in the sensing hydrophone system by 17 dB.