通过改变两个耦合混沌激光器反馈相位, 实现了两激光器之间信号的双向同步传输。两个激光器之间的部分透光的平面镜可以诱导延时和混沌动力学。数值模拟考虑延迟的激光器速率方程, 证明了两个激光器可以达到高质量同步。编解码的过程从信号改变两个激光器的反馈相位开始, 检测两个激光器中混沌载波光功率的差, 并与本地信号进行对比, 最终恢复发送者传输的数字信息。根据恢复出来信号的眼图, 可以看出该系统具有很高的传输质量。本方案中, 窃听者即使可以得到传输信号的差值, 也无法得知本地信号, 因此, 无法解调出发送者的信息, 系统的安全传输性能得以保障。

We change feedback phases of two coupled chaotic lasers to achieve bidirectional simultaneous transmission of signals between the two lasers. The partial transparent mirror between the lasers can induce delay and the chaotic dynamics. Numerical simulation of laser rate equation considering delay proves that the two lasers can achieve high-quality synchronization. The encoding and decoding process starts with the change of the feedback phases of the two lasers induced by signals. And then the difference in the optical power of the chaotic carrier in the two lasers is detected and compared with the difference with the local signal, finally, the digital messages sent by sender are recovered. Based on the eye diagram of recovered signal, it reveals that this system has a high transmission quality. In this scheme, the eavesdroppers cannot know the local signal even if he can get the difference of the transmitted signals. So the security of transmission performance of this system can be guaranteed as the eavesdroppers are unable to demodulate the sender's information.