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导出了单一串扰情况下 ,串扰光和系统光噪声共同存在时 ,接收机输入光信号及其基带输出信号的表达式。阐述了信号光与串扰光的物理相干性与信号数字逻辑相关性问题。计算了在最优判决门限情况下 ,背景误码率在10 - 9条件时 ,信号光消光比与串扰光消光比对系统误码率的影响。结果表明 ,消光比在 8～ 12dB的范围内 ,系统的误码特性接近最优。
The expression of input optical signal of receiver and its baseband output signal is deduced when the crosstalk noise and system optical noise coexist in the case of single crosstalk. The physical relativity between signal light and crosstalk light and the signal digital logic dependency problem are expounded. The influence of extinction ratio and extinction ratio of crosstalk on the bit error rate (BER) of the system under the optimal decision threshold is calculated. The results show that the extinction ratio is in the range of 8 ~ 12dB, and the error performance of the system is close to optimal.