Bending effect characterization of individual higher-order modes in few-mode fibers

被引：12

作者：

Xu, Yao ^{[1
,2
]}

Ren, Guobin ^{[2
]}

Jiang, Youchao ^{[1
,2
]}

Gao, Yixiao ^{[1
,2
]}

Li, Haisu ^{[1
,2
]}

Jin, Wenxing ^{[1
,2
]}

Wu, Yue ^{[1
,2
]}

Shen, Ya ^{[1
,2
]}

Jian, Shuisheng ^{[1
,2
]}

机构：

[1] Beijing Jiaotong Univ, EMC, Key Lab All Opt Network & Adv Telecommun Network, Beijing 100044, Peoples R China

[2] Beijing Jiaotong Univ, Inst Lightwave Technol, Beijing 100044, Peoples R China

来源：

OPTICS LETTERS | 2017年 / 42卷 / 17期

基金：

中国国家自然科学基金;

关键词：

OPTICAL-FIBERS; CURVATURE LOSS; LOSS FORMULA; AREA FIBERS;

D O I：

10.1364/OL.42.003343

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

We propose an approach to directly measure the bending effect on individual modes in few-mode fibers using a wavelength-scanning spatially and spectrally resolved imaging technique. By collecting a fiber output beam profile with a scanning wavelength at different bending diameters and analyzing the peaks of its Fourier transformation, we have distinguished higher-order modes (HOMs) of the fiber and investigated their group delay, beam profile, bend loss, and mode splitting individually. We have experimentally verified with a multilayer core fiber at 1-8 cm bending diameters that its HOMs experience more loss compared to lower-order modes, but delay at approximately the same speed as the bending diameter decreases. Mode splitting of the LP11 mode at a small bending diameter due to bending-induced birefringence is also observed and discussed. This method provides an efficient tool to study the bending effect on individual HOMs in fibers and could be extended to studying fiber stretching and twisting. (C) 2017 Optical Society of America

引用

页码：3343 / 3346

页数：4

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