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为了提高光通信系统的可靠性,利用光反馈半导体激光器在自由空间产生了通信源,实验中通过分析半导体激光器输出的相干特性,实现了对光通信源性能的检测。研究发现,无反馈时,激光器的输出为单模振荡,随反馈强度的增加,系统的输出经周期区域进入了混沌状态,通信光源的相干性逐渐变弱。此时系统处于复杂的随机变化状态,系统的抗破译能力强,利于隐藏信息,进行保密通信传输。
In order to improve the reliability of optical communication system, the optical feedback semiconductor laser is used to generate the communication source in free space. In the experiment, by analyzing the coherence of the output of the semiconductor laser, the performance of optical communication source is detected. The results show that the output of the laser is single-mode oscillation with no feedback, and the output of the system enters the chaotic state through the periodic region with the increase of the feedback strength, and the coherence of the communication light source becomes weaker. At this point the system is in a complex state of random changes, the system anti-deciphering ability, help to hide the information, secure communication transmission.