Key Laboratory of Advanced Transducers and Intelligent Control System, Ministry of Education and Shanxi Province, Taiyuan University of Technology, Taiyuan, 030024, People's Republic of China.
Institute of Optoelectronic Engineering, College of Physics and Optoelectronics, Taiyuan University of Technology, Taiyuan, 030024, People's Republic of China.
Sci Rep. 2018 Jan 16;8(1):827. doi: 10.1038/s41598-018-19180-w.
Chaotic Brillouin dynamic gratings (BDGs) have special advantages such as the creation of single, permanent and localized BDG. However, the periodic signals induced by conventional optical feedback (COF) in chaotic semiconductor lasers can lead to the generation of spurious BDGs, which will limit the application of chaotic BDGs. In this paper, filtered optical feedback (FOF) is proposed to eliminate spurious BDGs. By controlling the spectral width of the optical filter and its detuning from the laser frequency, semiconductor lasers with FOF operate in the suppression region of the time-delay signature, and chaotic outputs serving as pump waves are then utilized to generate the chaotic BDG in a polarization maintaining fiber. Through comparative analysis of the COF and FOF schemes, it has been demonstrated that spurious BDGs are effectively eliminated and that the reflection characterization of the chaotic BDG is improved. The influence of FOF on the reflection and gain spectra of the chaotic BDG is analyzed as well.
混沌布里渊动态光栅（BDG）具有独特的优势，例如能够产生单一、永久和局域的 BDG。然而，传统光反馈（COF）在混沌半导体激光器中诱导的周期性信号会导致虚假 BDG 的产生，从而限制了混沌 BDG 的应用。在本文中，提出了滤波光反馈（FOF）来消除虚假 BDG。通过控制光学滤波器的光谱宽度及其与激光频率的失谐，FOF 下的半导体激光器工作在延时特征的抑制区域，然后利用混沌输出作为泵浦波在保偏光纤中产生混沌 BDG。通过对 COF 和 FOF 方案的比较分析，证明了虚假 BDG 得到了有效消除，并且混沌 BDG 的反射特性得到了改善。还分析了 FOF 对混沌 BDG 的反射和增益谱的影响。
