More than 110-nm broadband mode converter based on dual-resonance coupling mechanism in long period fiber gratings

被引：39

作者：

Guo, Yancheng ^{[1
]}

Liu, Yan-ge ^{[1
]}

Wang, Zhi ^{[1
]}

Zhang, Hongwei ^{[1
]}

Mao, Baiwei ^{[1
]}

Huang, Wei ^{[1
]}

Li, Zhaohui ^{[1
]}

机构：

[1] Nankai Univ, Inst Modern Opt, Key Lab Optoelect Sensor & Sensing Network Techno, Tianjin, Peoples R China

来源：

OPTICS AND LASER TECHNOLOGY | 2019年 / 118卷

基金：

中国国家自然科学基金;

关键词：

Two-mode fiber long period grating; Orbital angular momentum; Dual-resonance coupling; Mode converter; GENERATION;

D O I：

10.1016/j.optlastec.2019.04.039

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

We propose and demonstrate the broadband generation of orbital angular momentum (OAM) beams with high efficiency based on a two-mode fiber long period grating (TMF-LPG) on account of a dual-resonance coupling mechanism. Theoretical and experimental investigations reveal that a dual-resonance coupling phenomenon exists because of the special phase matching condition between LP01 and LP11 core modes in the two-mode fiber. When a specific grating period is chosen, the dual resonance wavelengths gather together and the TMF-LPG could act as a broadband mode converter. An LPG with 15.0 dB bandwidth (corresponding to conversion efficiency greater than 96%) of 118.2 nm and 10.0 dB bandwidth (corresponding to conversion efficiency greater than 90%) of 156.4 nm is achieved in experiment. Furthermore, simulation results indicate that the operation wavelength can be extended to other wavelengths if a TMF with appropriate core radius is chosen to fabricate the LPG.

引用

页码：8 / 12

页数：5

共 22 条

[1] Multimode fiber amplifier with tunable modal gain using a reconfigurable multimode pump [J].