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稳定的窄脉冲光源、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(OCDMA)系统设计实现的3个关键模块。实验中利用增益开关脉冲光源,63位等效相移超结构布拉格光栅(EPS-SSFBG)相位编解码器和接收机门限调整技术实现了2.5 Gbit/s 60 km传输并得到了相应的误码曲线,系统在误码率(BER)等于10-9时的灵敏度为-22.5 dBm。实验结果表明,等效相移超结构布拉格光栅编解码器兼具高性能和可实现性,可用于实用化的光码分多址系统,而综合利用光域和电域的手段抑制旁瓣和噪声的影响是提高系统性能的重要手段。
Stable narrow pulse light source, high performance codec and receiver with sidelobe / noise suppression are the three key modules designed for optical code division multiple access (OCDMA) system. Experiments using gain switching pulse light source, 63-bit equivalent phase shift super-structure Bragg grating (EPS-SSFBG) phase coder and receiver threshold adjustment technology to achieve 2.5 Gbit / s 60 km transmission and the corresponding error curve , The system has a sensitivity of -22.5 dBm at a bit error rate (BER) equal to 10-9. The experimental results show that the equivalent phase shift superstructural Bragg grating codec can be used in practical optical code division multiple access system with both high performance and realizable performance. However, the combined use of optical and electrical fields suppresses sidelobes and The impact of noise is an important means of improving system performance.