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在Fabry—Perot型光纤光栅水听器复用阵列中,光脉冲的多次反射引入严重的通道间串扰。分析了不同的时分、波分复用光路结构中光纤光栅反射率对水听器通道间串扰的影响。提出了一种采用较高反射率光纤光栅有效抑制光纤光栅水听器阵列通道间串扰的光路结构。试验结果表明,在采用这种光路结构的2波分4时分的复用阵列中,通过使用反射率约为10%的光纤光栅,通道间串扰最大为-50.5dB。
In Fabry-Perot fiber grating hydrophone multiplexed arrays, multiple reflections of light pulses introduce severe cross talk between channels. The influence of FBG reflectivity on the crosstalk between hydrophone channels in different time-division and WDM optical path structures was analyzed. A new optical path structure with high reflectivity fiber grating is proposed to effectively suppress the crosstalk between FBG hydrophone arrays. The experimental results show that in a 2-wavelength, 4-time multiplexed array using this optical path structure, the maximum inter-channel crosstalk is -50.5 dB by using a fiber grating with a reflectance of about 10%.