DWDM系统啁啾高斯脉冲简并四波混频噪声标准差的计算

J4 ›› 2009, Vol. 26 ›› Issue (6): 736-743.

DWDM系统啁啾高斯脉冲简并四波混频噪声标准差的计算

杜建新

南京邮电大学光电工程学院，南京，210046

发布日期:2009-11-03
通讯作者: 杜建新，2006年毕业于中国科学院上海光学与精密机械研究所，获博士学位，现为南京邮电大学光电工程学院讲师，主要研究方向光纤通信与非线性光纤光学。 E-mail:dujx@njupt.edu.cn
基金资助:
国家自然科学基金项目（60707006），南京邮电大学校科研基金 (NY207007)

Calculation of degenerate four-wave-mixing noise for chirped Gaussian pulse in dense-wavelength-division-multiplexed system

DU Jian-Xin

College of Optoelectrical Engineering, Nanjing University of Posts & Telecommunication, Nanjing 210046

Online:2009-11-03

摘要/Abstract

摘要：

假定入射脉冲为啁啾高斯脉冲，考虑到各信道内的比特模式及比特序列初始相位的随机性，得到此种情况下的强度调制直接检测（IM/DD）密集波分复用系统（DWDM）简并四波混频噪声标准差的半解析的理论计算模型，这个理论模型同时考虑到各信道间的脉冲走离效应的影响，计算结果表明：除了群速度色散、信道间隔等是影响此种标准差的重要因素外，当高斯脉冲有较小的初始脉宽时，各信道比特序列的相对初始时延、初始啁啾参量都是重要的影响因素，计算结果同时表明：初始脉宽较小时，色散效应导致的脉宽随距离的变化对这种标准差值的影响不能忽略。

关键词: 光通信, 四波混频噪声, 密集波分复用, 啁啾高斯脉冲

Abstract:

The launched pulses for dense wavelength-division-multiplexing (DWDM) system with intensity modulated and direct-detection（IM/DD）scheme are assumed to be chirped Gaussian pulses. The pattern and initial phase of bit sequence in each channel are random. A statistical method is used to analyze these random quantities and a semi-analytic calculation model applied to evaluate the variance of degenerate four-wave-mixing (FWM) noise is obtained. The model also accounts for walk-off effect between channels. The results of calculation show that, to the value of deviation of degenerate FWM noise of chirped Gaussian pulse, not only the group velocity and channel separation are important, but also the initial delay of bit sequence of each channel and initial chirp of pulse are important in the case of small values of launched pulse width. It is also shown that, when the width of launched pulse is small, the change of pulse width with distance due to dispersion effect must be considered to avoid relative large error.

Key words: optical communication, four-wave-mixing (FWM) noise, dense wavelength-division-multiplexing , chirped Gaussian pulse

杜建新. DWDM系统啁啾高斯脉冲简并四波混频噪声标准差的计算[J]. J4, 2009, 26(6): 736-743.

DU Jian-Xin. Calculation of degenerate four-wave-mixing noise for chirped Gaussian pulse in dense-wavelength-division-multiplexed system[J]. J4, 2009, 26(6): 736-743.

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