40 Gb/s非零色散位移光纤传输系统中四种调制格式的性能比较  

Performance Comparison among Four Different Modulation Formats in a 40 Gb/s NZDSF Transmission System

作　　者：胡辽林[1] 刘增基[1] 杨国庆[1] 

机构地区：[1]西安电子科技大学综合业务网国家重点实验室,西安710071

出　　处：《光子学报》2003年第10期1181-1184,共4页Acta Photonica Sinica

摘　　要：介绍了四种调制格式即非归零 (NRZ) ,归零 (RZ) ,载波抑制的RZ(CSRZ)和单边带RZ(SSB RZ) ,用计算机仿真方法产生了这四种调制格式的 4 0Gb/s光信号 ,比较了其波形和光谱 .也对这四种调制格式在非零色散位移光纤 (NZDSF)上单信道传输进行了仿真 ,结果表明 :在色散完全补偿情况下 ,RZ ,CSRZ和SSB RZ抗非线性能力都比NRZ强 ,其中CSRZ最强 ,CSRZ能够容忍的入纤光功率比NRZ大 10 .2dBm ;RZ ,CSRZ和SSB RZ三种格式抗EDFA噪声能力差不多 。Four different modulation formats including nonreturn-to-zero (NRZ), return-to-zero (RZ), carrier-suppressed return-to-zero (CSRZ) and single sideband return-to-zero (SSB-RZ)are introduced. A method of their CM(46modulated signal generation is described, and a comparison of their spectra and waveforms is made. Then 40 Gb/sCM) single channel transmission over nonzero dispersion-shifted fiber (NZDSF) is simulated for the four formats. It is shown that RZ, CSRZ or SSB-RZ format is more tolerant than NRZ in nonlinearities, and CSRZ tolerance to nonlinearities is the highest among the four formats. Compared to NRZ, CSRZ is 10.2 dBm more tolerant in fiber input power. RZ, CSRZ and SSB-RZ have almost same tolerance to ASE of EDFA, but the three formats are more tolerant than NRZ in ASE of EDFA.

关 键 词：光纤通信 调制格式 非线性 归零码 

分 类 号：TN929.11[电子电信—通信与信息系统]