基于微纳光纤全光相位调制器的PGC解调系统

Study on PGC Demodulation System Based on All-Optical Microfiber Phase Modulator

基于光源内调制法的相位生成载波(PGC)解调系统中存在因干涉仪臂差及光源快速调谐引入环境相位噪声和光源相位噪声等问题,为此,建立了基于微纳光纤全光相位调制器的新型PGC解调系统。为满足PGC解调技术应用要求,设计了基于光吸收致热效应的微纳光纤全光相位调制器,调制带宽可达10kHz以上。在此基础上,构建了光纤水听器PGC解调系统,并进行了模拟水声信号的测试解调研究。实验结果显示,该系统可以对3kHz以下水声信号的进行良好解调。

The current phase generated carrier （PGC） demodulation system based on light source internal modulation method has phase noises of environmental and light source introduced by the interferometer arms difference and the high speed light source tuning, Aiming at this, a new PGC demodulation system based on microfiber all optical phase modulator is studied, To satisfy the PGC demodulation requirements, the microfiber all- optical phase modulator based on light absorbing thermal effect is designed with bandwidth exceeding 10 kHz. Based on this, the PGC demodulation system of fiber hydrophone is constructed, and used to study the detection and demodulation performance of underwater acoustic signal. Experimental results show that the proposed system can realize good demodulation performance for the underwater signal with frequency below 3 kHz.