概述了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。重点在于通过严密的数学推导,定量分析了直接调制光源伴生的调幅现象对于解调过程和结果的影响,并有针对性地提出了解决办法。同时就采用直接调制光源的相位载波零差检测方案时,设计中如何合理选择各相关参数,以达到最佳匹配进行了原理性探讨。给出了有关实验结果,这些理论分析和实验结果对于全光纤化水听器阵列的研究及检测系统的设计具有十分重要的意义。

The phase modulation and demodulation of interferometric Mach-Zehnder fiber-optic hydrophone using phase-generated-carrier (PGC) techniques with direct source modulation are described. The additional influence of amplitude modulation in the course of phase modulation is analyzed through rigorous mathematical calculation, and the resolution is given accordingly. To select various parameters reasonably and match them well are discussed when taking this scheme. Some experimental results concerned are given. The theoretical analysis and the experimental results are important to the study of all fiber optic hydrophone arrays and the signal detection system design.