High-efficiency optical coupling between VCSEL and 90-degree-bent Graded-Index Core Polymer Waveguide with Numeral Aperture Optimization

In this paper, we propose a higher efficiency optical coupling technique using 90-degree-bent Graded-Index (GI) core polymer waveguide which replaces conventional optical assembly (mirrors and lenses) in vertical cavity surface emitting laser (VCSEL) based optical engines. The 90-degree-bent GI-core...

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Bibliographic Details
Published in2021 IEEE CPMT Symposium Japan (ICSJ) pp. 150 - 153
Main Authors Kohmu, Naohiro, Ishii, Maho, Ishigure, Takaaki
Format Conference Proceeding
LanguageEnglish
Published IEEE 10.11.2021
Subjects
90°-bend polymer waveguide
GI-core polymer waveguide
Integrated optics
On-board optical interconnect
Optical coupling
Optical device fabrication
Optical diffraction
Optical interconnections
Optical losses
Optical waveguide components
VCSEL based Optical engine
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Summary:In this paper, we propose a higher efficiency optical coupling technique using 90-degree-bent Graded-Index (GI) core polymer waveguide which replaces conventional optical assembly (mirrors and lenses) in vertical cavity surface emitting laser (VCSEL) based optical engines. The 90-degree-bent GI-core polymer waveguides are fabricated using the Mosquito method. However, high coupling loss could be caused by the VCSEL beam divergence due to diffraction in the lens free coupling. We theoretically confirm that total insertion loss including bending loss as well as coupling loss could remain low by the waveguide NA control. Fabricating the 90-degree-bent GI-core polymer waveguides with the optimized NA, a waveguide insertion loss as low as about 2 dB is experimentally achieved.
ISSN:2475-8418
DOI:10.1109/ICSJ52620.2021.9648865