【摘要】 分析了谱域幅度编码的光CDMA通信系统的特点及其对编解码器的要求,根据阵列波导光栅的复用和解复用功能,设计了用于该通信系统中的两种阵列波导光栅编解码器。基于修正素数码MQC码,考虑接收机的热噪声和散弹噪声,采用数值分析的方法,研究了谱域幅度编码的光CDMA系统的通信性能。分析结果表明,由于AWG编解码器可以提供足够多的波长数,基于AWG编解码器的谱域光CDMA通信系统具有很好的误码率性能,可以同时容纳更多的用户数。更多还原

【Abstract】 The characteristics of spectral amplitude-coding optical CDMA communication systems and the needs of the encoder and decoder in this optical CDMA communications are analyzed.According to the multiplexing and demultiplexing performance of arrayed waveguide grating(AWG),two kind of encoders and decoders based on AWG used in spectral amplitude coding are presented.Using MQC codes,considering the effects of thermal noise,shot noise,and phase-induced intensity noise,the performance of spectral amplitude coding optical communication systems are studied.The results show that spectral amplitude-coding optical CDMA communication systems,which use AWG encoder and decoder,have good performance.And because the AWG encoder and decoder can provide enough number of optical wave,spectral amplitude-coding optical CDMA communications can accommodate more active users.更多还原