光纤水听器无电中继远程解调系&统噪声优化  

Noise Optimization of Repeaterless Remote Demodulation Systems of Fiber-Optic Hydrophone

作　　者：汪樟海 张红 王巍[1] 李东明[1] 葛辉良[1] 

机构地区：[1]杭州应用声学研究所,浙江杭州310023

出　　处：《中国激光》2017年第11期196-202,共7页Chinese Journal of Lasers

基　　金：声纳科技重点实验室基金(P140C2401080802)

摘　　要：光纤水听器无电中继远程解调系统的噪声主要来源于放大自发辐射(ASE)噪声和双重瑞利散射(DRS)噪声。为了优化系统噪声并提升系统的性能,通过噪声拟合方法实验分离了ASE噪声和DRS噪声对系统相位噪声的影响。结果表明ASE噪声是实验系统的主要噪声源,但DRS噪声也会成为降低系统相位噪声的限制因素。理论分析并实验验证了光源相位调制方案对两种噪声源的抑制效果,通过铌酸锂相位调制器对100km远程解调系统的光源施加幅度为2.2rad、频率为40 MHz的正弦相位调制,ASE噪声功率下降了5.2dB,DRS噪声功率下降了6.2dB,系统总相位噪声下降了5.2dB。The noise of repeaterless remote demodulation systems of fiber-optic hydrophone primarily comes from amplified spontaneous emission （ASE） noise and double Rayleigh scattering （DRS） noise. To optimize the noise and improve the performance of the system, the effects of ASE noise and DRS noise on phase noise of the system are separated experimentally by noise fitting. The results show that the ASE noise is the main noise source of the experimental system, while DRS noise also is the limiting factor of the phase noise reduction. The noise suppression effects of the illuminant phase modulation scheme on both ASE noise and DRS noise are theoretically analyzed and experimentally confirmed. Experimental results show that the total phase noise of 100 km remote demodulation system is suppressed by 5.2 dB when the sinusoidal phase modulation with amplitude of 2.2 rad and frequency of 40 MHz is applied by lithium niobate phase modulator, while ASE noise power is reduced by 5.2 dB and DRS noise power is reduced by 6.2 dB.

关 键 词：光纤光学 噪声优化 相位调制 放大自发辐射噪声 双重瑞利散射噪声 

分 类 号：TN253[电子电信—物理电子学]