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研究注入半导体激光混沌调制解调及其性能特性,提出外部光注入半导体激光器混沌内部相位编码方法.小信号调制分析了系统混沌调制响应函数和解调响应函数以及解调因子,系统的调制解调响应函数以及解调因子在60MHz有一个峰值,系统在高频调制时,响应函数和解调因子明显下降.理论推导出混沌调制解调方程,给出了小信号调制时的信息信号的解,数值分析出系统在低频有一个调制解调峰值,高频调制解调效果下降,但系统仍可以进行109Hz频率调制解调.数值模拟并证明了系统在较大的参数范围内都能实现同步,模拟了混沌调制速率200Mb/s和调制频率1·4GHz的保密通信应用.还通过键控调制注入光的相位相移对激光混沌态进行了编码,通过同步与非同步进行混沌解码,数值模拟了具有调制速率10Mb/s的混沌相位键控编码通信应用.
In this paper, the chaotic modulation and demodulation of semiconductor laser and its performance characteristics are studied, and the chaotic internal phase coding method of semiconductor laser with external light injection is proposed.The modulation and demodulation of the chaotic modulation response function, the demodulation response function, the demodulation factor, The response function and the demodulation factor have a peak at 60MHz, and the response function and demodulation factor obviously decrease when the system is modulated at high frequency. The chaos modulation and demodulation equation is derived theoretically, and the solution of information signal in small signal modulation is given. Numerical analysis shows that the system has a modulation and demodulation peak at low frequency and the effect of high frequency modulation and demodulation is reduced, but the system can still perform frequency modulation and demodulation at 109Hz. Numerical simulations show that the system can achieve synchronization within a large range of parameters, The chaotic modulation rate of 200Mb / s and the modulation frequency of 1.4GHz are used in the secure communication.At the same time, the laser chaotic state is encoded by the phase shift of the keying modulation injection light, and the chaos decoding is achieved through the synchronization and non-synchronization Application of chaotic phase keying coded communication with modulation rate 10Mb / s.