【摘要】 通过数学推导和仿真分析,对直接调制光源产生相位载波的马赫-曾德尔(Mach Zehnder)干涉型光纤水听器调制解调技术进行了研究。提出了不能通过干涉信号的峰值或峰峰值检测来控制自动增益控制(AGC)电路增益的方法消除偏振衰落对输出信号的影响。在这一思想的指导下完成了光纤水听器相位载波(PGC)解调电路的设计,给出了实验测试结果。更多还原

【Abstract】 The phase modulation and demodulation of interferometric Mach-Zehnder fiber-optic hydrophone using phase generated carrier (PGC) technique with direct source modulation is described and analyzed through mathematical calculation and simulation. It is found infeasible to overcome the polarization-induced fading influence on output signal through AGC circuit which uses peak or peak-peak signal of interferometric detection method to control the gain of AGC circuit. In this way, the PGC detection system design is completed and the experimental results are given out.更多还原