摘要
在入射脉冲为啁啾高斯脉冲条件下,考虑到各信道内比特序列初始相位和比特模式的随机性,建立了啁啾高斯脉冲色散管理波分复用系统中的简并四波混频噪声的半解析理论计算模型。并详细推导了啁啾高斯脉冲在色散管理光纤链路中的脉冲振幅表达式。色散图由两段群速度色散绝对值大小相等、符号相反且长度可变的光纤构成。通过对此模型仿真计算得到:脉冲特征宽度对FWM噪声标准差的影响比较明显,FWM噪声标准差值随脉冲特征宽度的增加而增加;当脉冲特征宽度较小时,啁啾参数值对FWM效应产生较大的影响,优化啁啾参数值可进一步降低FWM噪声标准差值;优化的色散管理方案可以使得噪声标准差有较小的值;对局部群速度色散系数绝对值进行优化,可得到较小噪声标准差值。
Under the condition that the launched pulses are chirped Gaussian pulses and in considering the randomness of bit pattern and initial phase of bit sequence in each channel, a semi-analytic calculation model applied to evaluate the variance of degenerated four-wave mixing noise in dispersion-management wavelength-division-multiplexing （WDM） system is estabilished. The pulse amplitude expressions for the chirped Gaussian pulse in dispersion-management fiber link are deduced in detail. The dispersion map is composed of two variable fiber segments with same absolute value and opposite sign of dispersion. The simulation indicates that the pulse characteristic widths have obvious impacts on standard variance of FWMnoise, while the standard variance of FWM noise increases with the increase of pulse characteristic widths. When the pulse characteristic width is smaller, the chirp parameter value has fairly great influence on the FWMeffect. The optimized dispersion management scheme could make the standard variance of FWM noise small.
出处
《通信技术》
2013年第6期9-11,14,共4页
Communications Technology
关键词
波分复用
色散管理
四波混频
啁啾高斯脉冲
比特模式
wavelength-division-multiplexing
dispersion-management fiber
four-wave mixing
chirped Gaussian pulse
bit pattern
