FSK-DWDM四波混频的研究  

Study on Four-Wave-Mixing in DWDM System based on FSK Modulation

作　　者：张鑫[1] 杜建新[1] 杨辉[1] 

机构地区：[1]南京邮电大学光电工程学院,江苏南京210046

出　　处：《通信技术》2013年第6期41-43,47,共4页Communications Technology

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因素的影响。给出了调制格式为FSK,信道为非简并,入射脉冲为啁啾高斯脉冲波情况下的四波混频噪声标准差的理论计算模型,在考虑到多个信道对于探测信道的影响的情况下用实例对其进行分析。研究结果表明在讨论调制偏移频率与四波混频噪声标准差的关系中我们发现调制偏移频率是有最优取值的,特征宽度值的大小基本不会影响到最优取值的选取,但是较小的特征宽度值可以得到比较小的四波混频效应,然而群速度色散值的大小对于调制偏移频率与四波混频标准差的关系曲线图的影响较大,其绝对值在很小的情况下,调制偏移频率与四波混频标准差曲线图基本呈线性增长趋势,随着其绝对值的增大,曲线出现了起伏变化。A theoretical calculation model is given for standard deviation of non-degenerated four-wave mixing noise in case that the modulation format is FSK and the launched pulses are chirped Gaussian pulse wave, without ignoring group-velocity walk-off of random bit sequence between channels. Some calculation examples indicate that in discussion of the relationship between deviation frequency and standard deviation of four-wave mixing noise, deviation frequency is found to have the optimal value in considering the influence of multiple channels on the detected channel. The characteristic width value would not affect the selection of optimal value while the small characteristic width value could obtain relatively small four-wave mixing effects. However the value of group velocity dispersion has a major influence on the relation curve between deviation frequency and standard deviation of four-wave mixing noise, and when its absolute value is small, the the relation curve between deviation frequency and the standard deviation of four-wave mixing noise exhibits a growing trend, and when its absolute values increases, the curve fluctuates.

关 键 词：FSK调制 非简并四波混频 啁啾高斯脉冲 密集波分复用 

分 类 号：TN929.11[电子电信—通信与信息系统]