DWDM系统非简并四波混频串扰的分析  

Analysis of non-degenerate four-wave-mixing crosstalk in DWDM system

作　　者：杜建新[1] 

机构地区：[1]南京邮电大学光电工程学院光通信研究所,南京210046

出　　处：《物理学报》2009年第2期1046-1052,共7页Acta Physica Sinica

基　　金：南京邮电大学校科研基金(批准号:NY207007)资助的课题~~

摘　　要：考虑到DWDM系统中的比特序列的随机性、信道间脉冲走离效应等多种因素的影响,完善了归零调制格式下的四波混频效率的计算方法,给出了相应的非简并四波混频噪声标准差的计算公式,并利用该公式进行实例分析,计算结果表明,当占空比和信道间隔变小时,不同信道内的随机比特序列的相对初始时延及光纤色散值的取值组合对四波混频效率的影响变得更大,为保证系统的低色散和低四波混频串扰特性,必须对这些量取值组合进行优化.Four-wave mixing （FWM） tone degrades system performance in dense wavelength-division-multiplexed （DWDM） optical transmission. A method of evaluating the efficiency of non-degenerate FWM tone for return-to-zero modulation scheme is developed without ignoring group-velocity walk-off of random bit sequence between channels. A theoretical model evaluating the standard deviation of FWM tone is then given. Some calculation examples show that, when the duty cycle and channel separation become small, the initial relative time delay of random bit sequences in different channels and fiber dispersion are more important to the FWM noise. Choosing optimal values of them is important to make the system to have low dispersion and small FWM crosstalk.

关 键 词：非简并四波混频 脉冲走离 密集波分复用 

分 类 号：O437[机械工程—光学工程]