Open AccessCompact and low-loss bent hollow waveguides with distributed Bragg reflector
Author(s) -
Hua Kung Chiu,
FuLi Hsiao,
ChungHan Chan,
Chii Chang Chen
Publication year - 2008
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.16.015069
Subject(s) - bent molecular geometry , optics , materials science , distributed bragg reflector , waveguide , bending , planar , bragg's law , core (optical fiber) , reflector (photography) , bend radius , substrate (aquarium) , silicon , refractive index , optoelectronics , diffraction , composite material , physics , wavelength , light source , oceanography , computer graphics (images) , computer science , geology
In this study, a hollow bent waveguide with distributed Bragg reflectors (DBR) in silicon substrate was presented theoretically and experimentally. We used the two-dimensional finite-difference time-domain method to simulate bending transmission efficiencies for arc- and cut-type 90 degrees -bent waveguides. The air core was embedded by Si(3)N(4)/SiO(2) multilayer. The multilayer stacks were deposited by using plasma-enhanced chemical vapor deposition on the top and bottom of air core. The lowest 90 degree bending loss is around 3.9dB for the arc-type bending waveguides and 0.8dB for cut-type bending waveguides, respectively. This waveguide demonstrates a possibility for higher density of integration in planar light wave circuits.