水下蓝绿光波段偏振调控器件的无串扰机理研究

光在水中传播时产生的后向散射对水下光通信以及光学成像系统造成的影响是不可忽视的。通过偏振调控器件对发射光进行偏振调制以及对接收光进行偏振检测，可有效分析后向散射光的偏振特性，为抑制后向散射提供新思路。本项目拟针对蓝绿光波段偏振控制器件的无串扰机理展开研究，通过抑制器件的偏振消光比来降低水下光学系统的偏振损耗，同时提高后向散射光的偏振分析精度。为探究偏振调控器件的无串扰机理，本项目将针对光子晶体光纤的高双折射原理和多光纤间的偏振模式耦合原理等关键问题，结合理论分析、建模仿真与实验验证展开研究。

In the marine enviroment, the influence of backscattering of light on underwater optical communication and optical imaging system cannot be ignored. By using polarization control devices to modulate the polarization of the transmitted light and detect the polarization of the received light, the polarization characteristics of backscattered light can be effectively analyzed, which could provide a new way to suppress the backscattered light. This project aims to study the crosstalk free mechanism of the polarization control devices in blue-green light bandwidth. Supressing the polarization extinction ratio of devices is used to reduce the polarization loss of the underwater optical system and improve the polarization analysis accuracy of backscattered light. This project will combine theoretical analysis, simulation and experimental verification, and focus on the key issues of the high birefringence principle of photonic crystal fibers and the polarization mode coupling principle between multiple fibers.