光栅法布里-珀罗腔干涉型水听器阵列中的时域串扰  

Time Domain Crosstalk in Fiber Bragg Grating Fabry-Pérot Interferometric Hydrophone Array System

作　　者：郭振[1] 高侃[1] 周少玲[1] 沙剑波[1] 

机构地区：[1]中国电子科技集团公司第二十三研究所,上海200437

出　　处：《光学学报》2016年第7期27-32,共6页Acta Optica Sinica

基　　金：上海市科学技术委员会资助课题(13dz1204500)

摘　　要：光栅法布里-珀罗腔干涉型水听器系统内的时域串扰严重限制了其实际应用,因此,对系统内时域串扰的产生机理进行分析,讨论在相位产生载波(PGC)解调方法下干涉信号的幅度对其相位信息的影响,并制作了两组不同反射率光栅水听器进行对比实验。实验表明,高反射率(R=0.6)光栅系统时分串扰明显,串扰信号在满足PGC解调能力的基础上其相位信息不会明显衰减;低反射率(R=0.02)光栅实现了34dB的串扰抑制。进一步研究发现,低反射率光栅系统中的串扰主要由前端水听器单元外加信号引起的多普勒效应噪声和时分串扰噪声组成。Time domain crosstalk in fiber Bragg grating Fabry-Pérot（F-P）interferometric hydrophone array system limits its practical application seriously.So it is necessary to analyze the generating mechanism of time domain crosstalk.With the phase generator carrier（PGC）demodulation,the effect of amplitude on phase is discussed for the interference signal.Then two comparative hydrophone systems with different reflectivities of fiber Bragg grating are fabricated and tested.Experimental results show that amplitude of the crosstalk is high for the demodulation signal with high reflectivity of grating（R=0.6）,because the phase of the crosstalk signal hardly reduces on the basis of the PGC demodulation.On the other hand,the crosstalk has about 34 dB suppression with the low reflectivity of grating（R=0.02）.Furthermore,the crosstalk in low reflectivity grating system is verified to be composite of the Doppler noise of precedent hydrophones and time domain crosstalk.

关 键 词：光纤光学 光纤水听器 光纤光栅 相位产生载波解调 串扰 

分 类 号：TN253[电子电信—物理电子学]