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针对强注入开环结构的外腔反馈半导体激光器混沌通信系统,数值计算得到系统增益与注入系数的定量关系曲线.对比是否使用系统增益对接收系统输出进行校正两种情况下系统的解调性能,表明使用增益校正的相减解调法获得的信息更接近原始信息.通过采用不同频率的正弦信号进行调制,表明信息频率对系统增益没有影响;用不同调制方法对0.2Gbit/s数字信号加密,结果表明系统增益与信号类型及调制方法无关.
Aiming at the chaotic communication system of external cavity feedback semiconductor laser with strong injection open-loop structure, the quantitative relationship between system gain and injection coefficient is obtained by numerical calculation.Compared with whether the system gain is used to correct the output of the receiving system, the demodulation performance, Which shows that the information obtained by subtraction demodulation using gain correction is closer to the original information.Using the sinusoidal signal of different frequencies to modulate the information shows that the information frequency has no influence on the system gain.Using different modulation methods to encrypt the 0.2Gbit / The results show that the system gain is independent of signal type and modulation method.