DocumentCode :
3610074
Title :
Lens-Less Coupling of Cavity-Resonator-Integrated Guided-Mode Resonance Filter
Author :
Inoue, Junichi ; Hatanaka, Koji ; Kintaka, Kenji ; Nishio, Kenzo ; Ura, Shogo
Author_Institution :
Kyoto Inst. of Technol., Kyoto, Japan
Volume :
33
Issue :
24
fYear :
2015
Firstpage :
5278
Lastpage :
5283
Abstract :
A cavity-resonator-integrated guided-mode resonance filter (CRIGF) consists of a grating coupler (GC) and a pair of distributed-Bragg reflectors (DBRs) on a thin-film dielectric waveguide, and provides a narrowband reflection spectrum for an incident small-diameter beam. A lens-less direct coupling of CRIGF to a single-mode optical fiber is theoretically and experimentally studied. A field-profile matching was discussed with alignment tolerance between CRIGF and the fiber. Design, fabrication, and characterization of CRIGF were described for an operation wavelength of 1540 nm. The aperture size and a nonuniform fill factors of the GC were investigated in order to realize high-efficiency coupling with an incident Gaussian beam of a 10.5-μm diameter. GeO2:SiO2 guiding core and Si-N cladding layers were deposited on a SiO2 glass substrate, and GC and DBRs were formed in the cladding layer by the electron-beam direct writing lithography. The lens-less direct coupling was demonstrated with wavelength selective coupling of the maximum efficiency of 50% and full-width at half-maximum of 1.3 nm.
Keywords :
distributed Bragg reflectors; germanium compounds; integrated optics; laser beams; optical design techniques; optical fibre cladding; optical fibre couplers; optical fibre fabrication; optical fibre filters; optical resonators; silicon compounds; CRIGF design; CRIGF fabrication; DBR; Gaussian beam; GeO2:SiO; SiN; SiO2; alignment tolerance; cavity resonator integrated guided-mode resonance filter; cladding layer; distributed Bragg reflectors; efficiency 50 percent; electron beam direct writing lithography; field profile matching; grating coupler; lensless coupling; narrowband reflection spectrum; single mode optical fiber; thin film dielectric waveguide; wavelength 1540 nm; wavelength selective coupling; Couplings; Gratings; Optical fiber filters; Optical fiber polarization; Reflection; Distributed Bragg reflectors; grating couplers; guided mode resonance; guided waves; optical filters; optical waveguides; waveguide cavities;
fLanguage :
English
Journal_Title :
Lightwave Technology, Journal of
Publisher :
ieee
ISSN :
0733-8724
Type :
jour
DOI :
10.1109/JLT.2015.2499274
Filename :
7323802
Link To Document :
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