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研究了影响干涉型光纤水听器远程无中继传输系统性能的各种噪声,分析了分布式拉曼光纤放大(DFRA)与掺铒光纤放大(EDFA)混合放大方案对光放大相位噪声抑制的效果,并通过实验得到了与仿真分析一致的结果。研究了相位产生载波(PGC)调制解调对相干双重瑞利散射(DRS)噪声的抑制原理,并对不同距离的DRS噪声抑制效果进行了讨论。远程实验结果表明,PGC技术可使相干DRS噪声降低19dB,混合放大可使光放大噪声降低7.2dB。经噪声综合抑制后,100km传输系统的相位噪声降至-113.2dB(即2.2μrad/Hz1/2),与短程系统噪声基本相当;200km传输后噪声降至-104dB(即6.3μrad/Hz1/2),相比短程系统增加的部分主要为残留的DRS噪声。
Various noises that affect the performance of interferometric fiber hydrophone remote relayless transmission system are studied. The effects of distributed Raman fiber amplifier (DFRA) and erbium doped fiber amplifier (EDFA) The result is consistent with the simulation analysis through experiments. The suppression principle of coherent double Rayleigh scattering (DRS) modulation by phase-modulated carrier (PGC) modulation is studied, and the effect of DRS noise suppression at different distances is discussed. The results of remote experiments show that the PGC technique can reduce the coherent DRS noise by 19dB and the hybrid amplification can reduce the optical amplification noise by 7.2dB. After noise synthesis suppression, the phase noise of the 100km transmission system is reduced to -113.2dB (ie, 2.2μrad / Hz1 / 2), which is almost the same as that of the short-range system. The noise after the 200km transmission is reduced to -104dB (ie 6.3μrad / Hz1 / 2 ), Which is mainly the residual DRS noise compared with the increase of short-range system.