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利用仿真的方法研究了光纤色散对快跳频光码分多址系统的影响 .建立了快跳频光码分多址系统的数学模型和仿真模块 ,利用该仿真模块研究了 N =1 2 ,q=2 9的快跳频 OCDMA系统中光纤群速度延迟色散导致的码字自相关输出峰值和取样切普内光能量的减小 .研究表明 ,对于高速 FFH- OCDMA系统 ,光纤的色散导致用户自相关输出峰值和取样切普内光能量的减小 ,进而降低了接收的信噪比 .同时 ,色散对同一码集内不同码字的影响各不相同 ,但差别不大 .基于峰值功率降为 80 %的标准 ,给出了用户所能达到的最大数据速率 .最后提出了两种新的抑制色散影响的方法 ,即光纤延迟线延迟量补偿法和码字优化法 .
The influence of optical fiber dispersion on fast frequency hopping optical code division multiple access system is studied by using the simulation method.The mathematical model and simulation module of fast frequency hopping optical code division multiple access system are established.Using the simulation module, The peak of the codeword auto-correlation output due to the delay dispersion of the optical fiber group in fast frequency-hopped OCDMA system with q = 2 9 and the decrease of the light energy in the sampling cut show that for the high-speed FFH-OCDMA system, the dispersion of the fiber leads to the user The peak value of autocorrelation and the decrease of the light energy in the sample slice reduce the signal-to-noise ratio of the received signal.At the same time, the influence of dispersion on different codewords in the same code set is different, but the difference is not significant.Based on the peak power drop Is the standard of 80%, and gives the maximum data rate that the user can reach.Finally, two new methods to suppress the dispersion are proposed, that is, the delay compensation method of fiber delay line and the code word optimization method.