具有多个波长通道的光纤光栅相位编/解码器

光码分多址(OCDMA)技术是实现未来宽带全光接入网的最佳技术之一.提出了一种基于超结构光纤光栅(SSFBG)的光码分多址时域相位编/解码器.编/解码器根据等效相移原理,采用Sinc函数作为采样函数,仅仅利用一块均匀的相位掩模板即实现了多个性能一致的编/解码信道,可以并行对不同波长通道的用户同时进行编/解码,既节省了成本又提高了系统容量.对该编/解码器的结构和性能进行了分析,并进行了计算机仿真.结果表明,对于使用127位Gold序列的编/解码器,各通道自相关峰瓣比(P/W)大于16.3 dB,峰瓣比波动小于0.4 dB,归一化自相关峰值波动小于0.04,各个编码通道取得了与纯相移编/解码器相近的性能,可用于光码分多址/波分复用(WDM)混合系统.

Fiber Bragg Grating Based Time Phase En-Decoder with Multiple Wavelength Channels

Optical code-division multi-access(OCDMA) is one of the most attractive techniques to realize all optical access network. A new OCDMA en-decoder based on super structure fiber Bragg grating(SSFBG) is proposed.Based on the equivalent phase shift theory,the proposed en-decoder adopts Sinc function as its sampling function and needs only one phase mask plate to achieve multiple en-decoding channels with similar performance.Users with different wavelength channels can be encoded(decoded) simultaneously by the proposed multi-channel en-decoder,and the capacity and compatibility of the system with wavelength division multiple(WDM) are improved.Analysis and computer simulation are made on the structure and performance of the encoder-decoder.Result shows that each channel achieves equivalent performance with the pure phase-shift en-decoder,the auto correlative P/W rates of each channel is more than 16.3 dB,the fluctuation of P/W rates is less than 0.4 dB,and the fluctuation of auto-correlation peak is less than 0.04 for the endecoder of 127 bit Gold-series.This multi-channel en-decoder can be used in OCDMA/WDM hybrid system.