稳定性高、低成本的窄脉冲光源、高性能编解码器和具有旁瓣/噪声抑制功能的接收机是光码分多址系统实用化的3个关键模块。实验中利用增益开关脉冲光源和63 chip等效相移超结构布拉格光纤光栅相位编解码器的半边带应用, 判决门限调整与宽带判决相结合的接收机实现了双用户、2.5 Gb/s 100 km传输。实验中测量了误码率与判决时刻和判决门限的关系曲线, 系统在10 ps的判决时刻容限内和17%的幅度判决容限内实现了无误码传输。

There are three key modules in coherent optical code division multiple access (OCDMA) system: source of ultra-short optical pulse, en/decoder and receiver. Two-user 2.5 Gb/s OCDMA experiment is shown to achieve 100 km transmission using single-band application between gain switch laser diode and 63-chip equivalent phase shift superstructured fiber Bragg grating (EPS-SSFBG) phase en/decoder, and threshold adjustable receiver with broadband decision. Relations between bit error rate (BER) and decision level and time are observed in the experiment, error-free transmission is achieved in the range of 10 ps decision time and 17% decision level.