Open AccessEffective area measurement of few-mode fiber using far field scan technique with Hankel transform generalized for circularly-asymmetric mode
Author(s) -
Tetsuya Hayashi,
Yuichi Tamura,
Toru Nagashima,
Kazuhiro Yonezawa,
Toshiki Taru,
Koji Igarashi,
Daiki Soma,
Yuta Wakayama,
Takehiro Tsuritani
Publication year - 2018
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.26.011137
Subject(s) - optics , multiplexer , physics , hankel transform , near and far field , crosstalk , refractive index , modal , mode volume , optical fiber , graded index fiber , multiplexing , materials science , telecommunications , fiber optic sensor , computer science , bessel function , polymer chemistry
We report on a measurement method for the effective area of the few-mode fiber. We derived a transform equation between a near-field pattern and a far-field pattern generalized for circularly-asymmetric higher-order modes of a cylindrical core, and enabled effective area measurement of the higher-order modes using high-dynamic-range far-field scan technique and low-crosstalk mode multiplexer. The measured effective area values agreed well with the values that were numerically predicted using a finite-element method from the refractive index profile, when the modal crosstalk was suppressed.