提出并数值证实利用反馈相位的随机调制可消除外腔半导体激光器反馈引起的时延结构.研究发现:当反馈相位随机调制信号的速率处在0.1—1Gbit/s范围,随机调制信号的切换幅值个数达到5时,在半导体激光器偏置电流(1.2—2.8Ith)和反馈速率(8—26GHz)构成的参数空间中,反馈时延结构对应的外腔长信息可被有效地消除.
We propose and numerically demonstrate that the feedback induced time-delay signature in an external cavity semiconductor laser can be eliminated by randomly modulating feedback phase. We find that when the rate of the random modulation signal is within the range of 0.1—1 Gb/s, and the number of the random variation amplitudes reaches 5, the time-delay signature corresponding to the external cavity can be effectively suppressed in the parameter space of injection current (1.2—2.8Ith) and feedback rate (8—26 GHz).