随机数字光信号注入半导体激光器产生混沌

Chaos Generation in Semiconductor Laser with Random Digital Optical Injection

提出并数值研究了随机数字相位调制光注入半导体激光器中产生混沌的方案。模拟结果表明:随着调制速率或调制深度的增大,激光器可以从初始的注入锁定状态经历准周期路径进入混沌,其原因是相位变化激励了非阻尼弛豫振荡;随机数字相位调制光注入可产生有效带宽大于10 GHz的混沌激光。鉴于数字信号长距离传输的抗干扰能力,该方案为长距离混沌同步及密钥分发应用提供了新思路。

This paper proposes and numerically studies a scheme of chaos generation in semiconductor lasers with randomdigitalphasemodulated optical injection.The simulation results demonstrate that as the modulation rate or modulation depth increases,the laser state changes from injectionlocking to chaotic through a quasiperiodic route due to the excitation of undamped relaxation oscillation by the phase change.Chaotic laser with an effective bandwidth over 10 GHz can be generated by randomdigitalphasemodulated optical injection.Given the antiinterference capability of digital signals in longdistance transmission,the proposed scheme provides a new approach for longdistance chaos synchronization and key distribution.