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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、2.5Gb/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。
High stability, low cost narrow pulse light source, high performance codec and receiver with sidelobe / noise suppression function are the three key modules of optical code division multiple access system. Experiments using gain switching pulse light source and 63 chip equivalent phase shift superstructure Bragg fiber grating phase codec half-band applications, the decision threshold adjustment and broadband decision receiver combined to achieve a dual-user, 2.5Gb / s 100 km transmission. The experiment measured the relationship between the bit error rate and the decision time and the decision threshold. The system realized error-free transmission within 10 ps decision margin and 17% decision margin.