Wuhan National Laboratory for Optoelectronics, and School of optical and electronic information, Huazhong University of Science and Technology, Wuhan, 430074, China.
Wuhan Research Institute of Posts and Telecommunications, 88# Youkeyuan Road, Hongshan District, Wuhan, 430074, China.
Sci Rep. 2017 May 31;7(1):2539. doi: 10.1038/s41598-017-02781-2.
We propose and experimentally demonstrate spatial rotation manipulation for radially asymmetric modes based on two kinds of polarization maintaining few-mode fibers (PM-FMFs). Theoretical finding shows that due to successful suppression of both polarization and spatial mode coupling, the spatial rotation of radially asymmetric modes has an excellent linear relationship with the twist angle of PM-FMF. Both elliptical core and panda type FMFs are fabricated, in order to realize manageable spatial rotation of LP mode within ±360° range. Finally, we characterize individual PM-FMF based spatial orientation rotator and present comprehensive performance comparison between two PM-FMFs in terms of insertion loss, temperature sensitivity, linear polarization maintenance, and mode scalability.
我们提出并实验演示了基于两种保偏多模光纤（PM-FMF）的径向非对称模式的空间旋转操控。理论发现表明，由于成功抑制了偏振和空间模式耦合，径向非对称模式的空间旋转与 PM-FMF 的扭转角呈出色的线性关系。我们制造了椭圆芯和熊猫型 PM-FMF，以实现 LP 模式在±360°范围内的可管理空间旋转。最后，我们对基于 PM-FMF 的单个空间定向旋转器进行了特性描述，并根据插入损耗、温度灵敏度、线性偏振保持和模式可扩展性等方面，对两种 PM-FMF 的性能进行了全面比较。
