Research on Optical Chaos and it's Applications in Semiconductor Lasers with Phase-Conjugate Optical Feedback

半导体激光器容易由于来自外部反射器的反馈而不稳定，并且在存在到激光器的光反馈的情况下，采用半导体激光器作为光源的系统的性能大大降低。这种不稳定性来自系统中涉及的非线性动力学，称为系统中的混沌。同时，半导体激光器被用作相位共轭光学的光源。相位共轭反馈对半导体激光器的作用是非常重要的，因为相位共轭镜的反射光被自动反馈到光源。然而，在这方面的研究很少。在这个项目中，相位共轭反馈半导体激光器的动力学进行了广泛的研究和相位共轭和普通反射镜的反馈之间的差异已经澄清。还研究了相位共轭反馈在半导体激光器中的应用。结果表明，相位共轭反馈实现了对激光器的有效控制和噪声抑制。研究了保密通信中的混沌同步问题，证明了相位共轭反馈半导体激光器可以作为混沌通信系统的高性能混沌产生模块。

A semiconductor laser is destabilized easily by a feedback from an external reflector and the performance of a system employing a semiconductor laser as a light source is much degraded in the presence of optical feedback to the laser. This instability is derived from the nonlinear dynamics involved in the system and is known as chaos in the system. In the meantime, a semiconductor laser is used as a light source for phase-conjugate optics. The effects of Phase-conjugate feedback to a semiconductor laser are very important since the reflected light by a phase-conjugate mirror is automatically fed back to the light source. However, a few researches have been done in this area. In this project, the dynamics of semiconductor lasers with phase-conjugate feedback have been extensively investigated and the differences between feedback from phase-conjugate and ordinary mirrors have been clarified. Applications of phase-conjugate feedback in semiconductor lasers have been also investigated. As a result, effective laser control and noise suppression have been attained by phase-conjugate feedback. Chaos synchronization for secure communications has been studied and it has been proved that semiconductor laser with phase-conjugate feedback can be used as a high performance chaos generating module for chaos communication systems.