Open AccessOptimum index profile of few-mode coupled multicore fibers for reducing the group delay spread
Author(s) -
Kazuki Yoshida,
Takeshi Fujisawa,
Takanori Sato,
Kunimasa Saitoh
Publication year - 2019
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.27.016281
Subject(s) - optics , mode (computer interface) , multi core processor , core (optical fiber) , bending , modal , coupling (piping) , modal dispersion , physics , group delay and phase delay , mode coupling , coupled mode theory , materials science , refractive index , optical fiber , graded index fiber , telecommunications , computer science , fiber optic sensor , composite material , bandwidth (computing) , thermodynamics , operating system
We numerically investigate the group delay spread (GDS) characteristics in few-mode coupled multicore fibers (FM-CMCFs) in weak random-bending conditions by using a coupled-wave theory. We qualitatively show the modal coupling between modes in the intra- and the inter-mode group generated by bending. The results indicate that the modes of FM-CMCFs are less likely to couple with each other in weak random-bending conditions in contradiction to single-mode coupled multicore fibers. To resolve this problem, we demonstrate an optimum index profile and core pitch, where the GDS can be reduced even if the different mode groups do not couple strongly.