Open AccessWavelength division multiplexer based on cavity-resonator-integrated guided-mode resonance filters for a compact multi-wavelength light source
Author(s) -
Jun–ichi Inoue,
Atsushi Tsuji,
Kenji Kintaka,
K. Nishio,
Shogo Ura
Publication year - 2018
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.26.002212
Subject(s) - optics , multiplexer , resonator , wavelength , waveguide , guided mode resonance , distributed bragg reflector , materials science , reflector (photography) , optoelectronics , aperture (computer memory) , multiplexing , diffraction grating , physics , telecommunications , light source , computer science , acoustics
Cavity-resonator-integrated guided-mode resonance filters (CRIGF) consisting of a grating coupler in a waveguide resonator formed by two distributed Bragg reflectors of different reflectances can act as a wavelength-selective reflector and an input waveguide coupler for an incident free-space wave. Integration of CRIGFs in a waveguide is proposed to give an array of external mirrors and a wavelength division multiplexer for constructing a compact multi-wavelength light source. Four CRIGFs of 10-μm-size aperture with a wavelength spacing of 15 nm were designed and fabricated. The reflectance of 62% and output efficiency of higher than 18% were theoretically predicted. Multiplexing of four wavelengths was confirmed experimentally.