Differential mode delay diagnostics for LP modes traversing a few-mode fiber

被引：3
作者：
Shibata, Nori [1 ]
Watanabe, Kimitaka [1 ]
Ohashi, Masaharu [2 ]
Sasaki, Yusuke [3 ]
Aikawa, Kazuhiko [3 ]
机构：
[1] Nihon Univ, Coll Engn, Fukushima 9638642, Japan
[2] Osaka Prefecture Univ, Sakai, Osaka 5998531, Japan
[3] Fujikura Ltd, Sakura, Chiba 2858550, Japan
来源：
APPLIED OPTICS | 2021年 / 60卷 / 36期
关键词：
INTERFERENCE; TRANSMISSION;
D O I：
10.1364/AO.442256
中图分类号：
O43 [光学];
学科分类号：
070207 ; 0803 ;
摘要：
We provide differential mode delay (DMD) diagnostics for linearly polarized (LP) modes traversing a few-mode fiber (FMF). We employ a modal interferometer method with a butt coupling mechanism to measure the DMD between any two modes guided in FMFs with step-index (SI) and depressed-cladding profiles. The measurement principle is based on investigating a transmitted spectrum through temporal decomposition by means of a Fourier transform. At least four different temporal waveforms are needed for an FMF supporting four LP modes to estimate the DMD between two different LP modes. A butt coupling mechanism with an air gap between an FMF and a dispersion-shifted fiber is employed for simultaneous DMD measurement. The present diagnostics requires some knowledge of the bending loss characteristics of the FMFs and the butt coupling properties of the circular symmetry modes or circular asymmetry modes in their electric fields. The DMD diagnostics are realized taking the bending loss and butt coupling characteristics into consideration. We present experimental results for the DMD and DMD slope as a function of the wavelength in a 1450-1625 nm telecommunication band. (C) 2021 Optical Society of America
引用
收藏
页码：11050 / 11057
页数：8
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