Open AccessDesign for polymer optical waveguides realizing efficient light coupling via 45-degree mirrors
Author(s) -
Yoshie Morimoto,
Takaaki Ishigure
Publication year - 2019
Publication title -
optics express
Language(s) - Uncategorized
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.27.010839
Subject(s) - cladding (metalworking) , optics , refractive index , materials science , waveguide , core (optical fiber) , coupling loss , coupling (piping) , total internal reflection , insertion loss , optoelectronics , optical fiber , physics , metallurgy
We design graded-index (GI) circular-core waveguides to realize low-loss light coupling via 45-degree mirrors using a ray-trace simulator. The waveguide's structural parameters, which determine the insertion loss of the waveguides with 45-degree mirrors, are the cladding thickness, the core size, the refractive index of materials, and the mirror angle. The optimum waveguide structural parameters are determined, and the GI circular-core waveguide with the appropriate structural parameters which is actually fabricated exhibits much lower total link loss than step-index (SI) core waveguides. The tight optical confinement of the GI-core contributes to the reduction of loss increment due to the mirror structure.