Gao Ya, Sun Junqiang, Chen Guodong, Sima Chaotan
Opt Express. 2015 Apr 20;23(8):9959-67. doi: 10.1364/OE.23.009959.
We experimentally demonstrate mode conversion by exploiting optical reflection of tilted few-mode fiber Bragg grating (FM-FBG). Mode conversions from LP(01) mode to higher symmetric and asymmetric modes are achieved, and more than 99.5% conversion efficiency from LP(01) to LP(11) mode is obtained using a 1.6°-tilted FM-FBG. Influences of the weakly tilted FM-FBG parameters on the property of mode conversion is analyzed and discussed. A simultaneous mode conversion and demultiplexing scheme for 4-mode × 3-wavelength multiplexing transmission is proposed and the modal crosstalk is analyzed based on the transmission spectra of the tilted FM-FBGs. The proposed approach shows potential applications in mode and wavelength division multiplexing communication systems.
我们通过利用倾斜的少模光纤布拉格光栅（FM-FBG）的光学反射，通过实验证明了模式转换。实现了从LP(01)模式到更高对称和非对称模式的模式转换，并且使用1.6°倾斜的FM-FBG获得了从LP(01)到LP(11)模式超过99.5%的转换效率。分析并讨论了弱倾斜FM-FBG参数对模式转换特性的影响。提出了一种用于四模式×三波长复用传输的同时模式转换和解复用方案，并基于倾斜FM-FBG的传输光谱分析了模态串扰。所提出的方法在模式和波分复用通信系统中显示出潜在的应用。
