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光纤传感系统在应用于水声及地震波探测等场合时,其通道间相位一致性将影响波束形成的质量,进而影响探测目标的定位精度,因此研究传感系统的通道间相位一致性具有重要的意义。分析了影响基于相位产生载波(PGC)解调法和密集波分复用(DWDM)的多通道光纤激光传感系统通道间相位一致性的各种因素。理论计算结果表明,传感器波长差异对通道间相位差的影响可以忽略。两通道分布反馈式(DFB)光纤激光传感系统通道间相位一致性的实验测试结果表明,传感器波长差异不会对各通道解调结果的相位信息带来影响,当多通道DFB光纤激光传感系统各通道采用相同的参数设置时,各通道解调结果间具有很高的相位一致性,与理论分析结果相吻合。
When applied to underwater acoustic and seismic wave detection, the optical fiber sensing system will affect the quality of beamforming due to the phase consistency between channels, and affect the positioning accuracy of the target. Therefore, it is important to study the phase consistency between channels in the sensing system Meaning. Various factors that affect the phase consistency between multi-channel fiber laser sensing systems based on Phase-Generated Carrier (PGC) demodulation and Dense Wavelength Division Multiplexing (DWDM) are analyzed. The theoretical calculation results show that the influence of wavelength difference of sensors on the phase difference between channels can be neglected. Experimental results of phase consistency between two channels of DFB fiber laser sensing system show that the wavelength difference of the sensors will not affect the phase information of each channel demodulation result. When the multi-channel DFB fiber laser sensing When the same parameters are set for each channel of the system, the demodulation results of each channel have a high phase consistency, which is in good agreement with the theoretical analysis.