摘要
通过引入描述扰动程度的参数X和描述掺饵光纤放大器(EDFA)饱和特性陡度的参数T,本文推出了一个归一化的EDFA增益表达式,并据此对系统受扰后的信号恢复特性和误码率变化进行了分析。结果表明:对EDFA饱和程度较浅的陆上光纤通信系统,出现小于1dB(X≥0.8)的微扰时,光功率经一级EDFA即可恢复其原值的90%;系统经3dB扰动(X=0.5)后,光功率(信号和噪音功率之和)经过三级EDFA方能恢复到原值的90%,但系统误码率(BER)的恶化则在两个量级以上,且随着扰动开始点的后移而更加恶化。这说明为保证系统受扰后能正常工作,其光信噪比应有相当大的裕量。EDFA饱和越浅,系统受扰动的影响就越严重。
By introducing two parameters,X(describing the perturbation)and T(descibing thesteepness of EDFA ain under saturation),an improved normalized Erbium-Doped Fiber Amplifier(EDFA)gain formula is derived.For terrestrial systems where EDFAs work under light saturation,results show that the optical power could regain 90 per-cent of its original value after one stage ofEDFA under perturbation of less than 1 dB(≥0.8).When the system suffers a 3 dB(X=0.5)perturbation,3 stages is needed to achieve the same degree of optical power restoration. On the otherhand,the corresponding system Bit-Error-Rate(BER)will deteriorate by more than two~orders ofmagnitude,and the later the perturbation starts,the more degradation in BER. Less saturatedEDFAs would result in worse BER under perturbation.
出处
《光子学报》
EI
CAS
CSCD
1995年第6期519-523,共5页
Acta Photonica Sinica
基金
863计划基金
关键词
光纤通信
系统特性
掺杂
铒
光纤放大器
optical fiber communication
System performance
Signal-restoration
EDFA
BER