喇曼放大器噪声对性能的影响

摘要

对拉曼放大器(RA)的放大自发辐射(ASE)噪声、等效自发辐射因子、等效噪声系数以及RA中的ASE噪声、瑞利噪声、光纤长度和开关增益分别对光接收机信噪比的影响进行了理论分析,并对双重瑞利背向散射噪声进行了理论计算和相关数值仿真.计算与仿真结果表明:在同一信号输入条件下,RA相对掺铒光纤放大器(EDFA)能提高光接收机的信噪比;RA的等效自发辐射因子＜1且其随开关增益的增加而减小,因而优于EDFA;RA的瑞利噪声可以忽略的条件为RA的增益＜15 dB;文中还得到对优化设计RA具有重要参考价值的一些其它结论.%The Amplified Spontaneous Emission (ASE) noise,equivalent spontaneous emission factor and equivalent noise factor for the Raman Amplifier (RA) as well as the respective impacts of the the ASE noise,Rayleigh noise,optical fiber length and the switching gain in the RA on the Signal Noise Ratio (SNR) of optical receivers are theoretically analyzed,and then the Double Rayleigh Backscattering (DRB) noise are also theoretically analyzed and calculated.Furthermore,the numerically related simulations are also implemented.The calculation and simulation results show that,compared with the Erbium-Doped Fiber Amplifier (EDFA),the RA can improve the SNR of optical receivers under the condition of the same input signal; the equivalent spontaneous emission factor is less than 1 and decreases with the increase of the switching gain,so this characteristics of the RA are superior to that of the EDFA.Moreover,when the gain of the RA is less than 15 dB the Rayleigh noise of the RA can be ignored.Also,some other significant conclusions to play the important roles in guiding the optimal design of the RA are obtained.