平衡检测接收的光码分多址系统实验研究

Nove Balance Detection Technique of Optical CDMA Communication System with Bragg Grating Arrays

提出了一种基于新的编码方式的频谱编码光码分多址(CDMA)系统。系统采用m序列的反码作为地址码。利用可调谐光纤布拉格光栅(FBG)阵列,实验验证了利用平衡检测法可以消除多址干扰。讨论了该系统与采用原码序列做地址码系统误码率(BER)的差异。采用此种编码方式与采用原码做地址码的系统相比,同等条件下,可以降低BER至少5dB;同时又可以减少光栅数目,节省系统成本。

A novel optical code division multiple access(CDMA) system based on fiber Bragg grating(FBG) spectral coding,which adopts spectral coding based on complement code of m sequence,was presented,and multi-access interference(MAI) of the new system can be reduced completely with the help of balanced decoder.The MAI is reduced completely in the experiments.The systems bit error rate (BER) is at least 5 dB lower than traditional ones in the same situation due to the saving of fiber gratings in both transmitter end and receiver end,but also has lower cost and is easy to accomplished.