SAC OCDMA系统FOC地址码设计及性能研究

设计了一种新的适合同步光谱幅度编码光码分变址(Spectral-amplitude coding optical code division multiple access,SAC OCDMA)系统的地址码,能够使多址干扰产生的误码率为0.且该地址码的互相关限为1,在给定码重和用户数的情况下能够得到较小码长,便于系统的编解码。利用OptiSys 7.0设计出仿真系统,分析比较用波分复用器和光纤光栅作为编解码器适用的不同系统,在考虑散弹噪声、相位引起的强度噪声(PIIN)和热噪声的情况下,根据该地址码的特点分析整个编解码系统的信噪比和误码率,并与现有的SAC地址码性能进行比较.结果表明:选用该地址码的SAC OCDMA系统得到的眼图更为理想,在系统误码率、编解码实现,及系统性能上都有了很大的提高。

Design and performance of FOC for spectral-amplitude-coding optical CDMA system

A new class of codes for synchronous SAC OCDMA system was designed, the error rate cause by multiple access interference is 0. The codes’ cross-correlation is one, defined the code weight and the number of users can get the shorter code length. Using the OptiSys7.0 to system simulation, analysis and comparison with the wavelength division multiplexer and the fiber grating as the codecs in different systems, in considering with the shot noise, phase induced intensity noise (PIIN) and thermal noise, analyzed the signal to noise ratio and bit error rate according to the characteristic of the codes and compared with the existing SAC codes. The results showed that: the SAC system with the codes has clear eye diagram, in the bit error rate, codec implementation and system performance has been greatly improved.