All-fiber mode converter based on long-period fiber gratings written in few-mode fiber

被引：112
作者：
Zhao, Yunhe [1 ]
Liu, Yunqi [1 ]
Zhang, Chenyi [1 ]
Zhang, Liang [1 ]
Zheng, Guangjun [1 ]
Mou, Chengbo [1 ]
Wen, Jianxiang [1 ]
Wang, Tingyun [1 ]
机构：
[1] Shanghai Univ, Key Lab Specialty Fiber Opt & Opt Access Networks, Shanghai Inst Adv Commun & Data Sci, Sch Commun & Informat Engn, 99 Shangda Rd, Shanghai 200444, Peoples R China
来源：
OPTICS LETTERS | 2017年 / 42卷 / 22期
基金：
中国国家自然科学基金;
关键词：
OPTICAL VORTEX GENERATION; DIVISION;
D O I：
10.1364/OL.42.004708
中图分类号：
O43 [光学];
学科分类号：
070207 ; 0803 ;
摘要：
We investigated an all-fiber mode converter based on longperiod fiber gratings (LPFGs) written in the few-mode fiber. Mode conversion between the fundamental core mode and different higher-order core modes (LP11, LP21, and LP02 modes) can be realized via a single LPFG with an efficiency of 99% at the resonance wavelength. Moreover, optimized mode conversion between the LP01 and LP21 modes can be realized by cascading two LPFGs with different grating pitches. The maximum conversion efficiency is estimated to be similar to 99.5% at 1553 nm. The orbital angular momentum states with different topological charges (+/- 1; +/- 2) are demonstrated experimentally. The all-fiber LPFG mode converters could have promising applications in the mode-division multiplexing optical communications. (C) 2017 Optical Society of America
引用
收藏
页码：4708 / 4711
页数：4
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