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Connection loss reduction in variable optical delay line by using graded‐index type photonic crystal fiber
Author(s) -
Higuchi Keiichi,
Yokota Hirohisa,
Yoneya Kazuki,
Imai Yoh
Publication year - 2018
Publication title -
ieej transactions on electrical and electronic engineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.254
H-Index - 30
eISSN - 1931-4981
pISSN - 1931-4973
DOI - 10.1002/tee.22624
Subject(s) - photonic crystal fiber , materials science , beam propagation method , connection (principal bundle) , optics , optical fiber , refractive index , photonic crystal , fiber , reduction (mathematics) , microstructured optical fiber , single mode optical fiber , optoelectronics , graded index fiber , physics , composite material , mathematics , fiber optic sensor , engineering , structural engineering , geometry
A low‐loss butt‐joint connection method between photonic crystal fibers (PCFs) by using a graded‐index type photonic crystal fiber (GI‐PCF) is proposed. The GI‐PCF, in which the diameter of the air holes is chosen in a parabolic distribution in the effective refractive index, is analyzed numerically by a beam propagation method. It is found that the mode extent in the GI‐PCF varies periodically along the propagation direction when the LP 01 mode of the PCF is launched into the GI‐PCF. This characteristic is successfully applied to reduce the butt‐joint connection loss between the PCFs by 1.6 dB with a 20.6‐mm GI‐PCF under 200 µm air gap. © 2018 Institute of Electrical Engineers of Japan. Published by John Wiley & Sons, Inc.