摘要
为了研究色散和非线性对异步光码分多址系统性能的影响,基于非线性薛定谔方程,采用数值模拟的方法,取得了异步光码分多址系统误比特率与传输距离的关系曲线和与用户数关系曲线。结果表明,光纤中的群速度色散、3阶色散和非线性效应都会引起异步光码分多址系统性能劣化,其中以群速度色散效应的影响最为严重;系统传输媒质可以采用色散位移光纤,改善由此造成的系统性能下降。
In order to study the influence of dispersion and nonlinearity on asynchronous optic code division multiple access （OCDMA） systems based on nonlinear Schrtidinger equation, the functions of the bit error rate of an asynchronous OCDMA system with the transmission distance and the number of users were obtained by means of simulation. The results show that the performance of an asynchronous OCDMA system can be deteriorated severely by the group velocity dispersion, the third-order dispersion and nonlinear effects, especially the group velocity dispersion. Dispersed shift fiber can be used as system transmission medium so as to compensate the consequent system performance degradation.
出处
《激光技术》
CAS
CSCD
北大核心
2011年第5期705-707,711,共4页
Laser Technology
关键词
光通信
异步光码分多址系统
色散
非线性效应
光正交码
optical communication
asynchronous optic code divison multiple access systems
dispersion
nonlinear effect
optical orthogonal code
