针对光码分多址系统对地址码的要求, 通过改进的Tent映射产生混沌扩频序列, 将序列作为系统中的用户地址码; 搭建光码分多址系统, 分析混沌码与素数码相比下的系统性能。结果表明, 产生的混沌序列有良好的相关性和初值敏感性, 可以有效抑制系统的多址干扰并增强系统安全性; 在2.5Gb/s的传输速率下, 使用混沌序列码的光码分多址系统较素数码系统最小误码率提高1~3个数量级; 同时较传统光正交码的系统误码率性能也可提高1~2个数量级。

According to the requirement of address codes for optical code division multiple access system, the chaotic spread spectrum sequences were generated by the improved Tent map, and the sequences were taken as the user address codes in the system. Optical code division multiple access system was built, and the system performance was analyzed by comparing chaotic code with prime code. The results show that chaotic sequence has good correlation properties and initial values sensitivity, and the influence of multiple access interference was restrained and the system security was enhanced. Under the transmission rate of 2.5Gb/s, the minimum bit error rate performance of using the chaotic sequence code was improved by 1~3 orders of magnitude. And the bit error rate is improved by 1~2 orders of magnitude by comparing with that of the traditional optical orthogonal code.