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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。
In phase modulation carrier (PGC) demodulation system based on intra-light modulation, there are some problems such as ambient phase noise and phase noise of light source due to the interferometer arm aberration and rapid tuning of light source. For this reason, The new PGC demodulation system. In order to meet the application requirements of PGC demodulation technology, a micro-nano optical fiber all-optical phase modulator based on the thermal effect of light absorption is designed, and the modulation bandwidth is up to 10 kHz. On this basis, the fiber hydrophone PGC demodulation system is constructed, and the test demodulation of the analogue underwater acoustic signal is carried out. Experimental results show that the system can demodulate underwater acoustic signals under 3 kHz well.