基于相位载波解调法的多通道光纤激光传感系统相位一致性研究

Research on Phase Consistency of Fiber Laser Sensor Array System Based on Phase Generated Carrier Demodulation

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。

The phase consistency between different channels of the fiber laser sensor system has great effect on beamforming and target locating in the detection of underwater acoustics and seismic wave.So it is important to study the phase consistency between different channels.The factors influencing the phase consistency of the fiber laser array system based on dense wavelength division multiplexing（DWDM） and phase generated carrier（PGC） demodulation are analyzed.The analysis and corresponding calculations show that the influence of the sensor′s wavelength difference can be neglected.An experiment is carried out on two channels distribution-feedback（DFB） fiber laser sensor array system to demonstrate the analysis,The results show that the system has high phase consistency in the situation of different sensors and the results are in accordance with the theoretical expectations.