Title :
59-nm trimming of center wavelength of ARROW-type vertical coupler filter by UV irradiation
Author :
Sato, S. ; Pan, W. ; Chu, S.T. ; Endo, S. ; Suzuki, S. ; Kokubun, Y.
Author_Institution :
Kanagawa Acad. of Sci. & Technol., Japan
fDate :
3/1/1999 12:00:00 AM
Abstract :
An antiresonant reflecting optical waveguide (ARROW)-type vertical coupler filter (VCF) with a polysilane cover layer is designed and fabricated to demonstrate the trimming of the center wavelength of the filter by ultraviolet (UV) irradiation. The propagation constant of the upper waveguide of the VCF was modified by UV irradiation on the polysilane cover in the presence of oxygen. The refractive index of polysilane can be adjusted from 1.448 to 1.427 by the exposure time of the UV irradiation. A wide trimming range of 59 nm (1567.5 nm to 1508.8 nm) of center wavelength is demonstrated.
Keywords :
optical couplers; optical design techniques; optical fabrication; optical films; optical planar waveguides; optical polymers; optical waveguide filters; refractive index; ultraviolet radiation effects; 1567.5 to 1508.8 nm; ARROW-type vertical coupler filter; UV irradiation; antiresonant reflecting optical waveguide-type vertical coupler filter; center wavelength; design; exposure time; fabrication; polysilane cover layer; propagation constant; refractive index; upper waveguide; wavelength trimming; wide trimming range; Glass; Optical coupling; Optical filters; Optical refraction; Optical sensors; Optical waveguides; Refractive index; Temperature control; Temperature dependence; Wavelength measurement;
Journal_Title :
Photonics Technology Letters, IEEE
