title: Direct laser writing of thermally stabilized channel waveguides with Bragg gratings.
abstract: Thermally stabilized photo-induced channel waveguides with Bragg gratings were fabricated in Ge-B-SiO2 thin glass films by exposure with KrF excimer laser and successive annealing at 600 degrees C. The annealing reversed the photo-induced refractive index pattern and also enhanced its thermal stability. The stabilized channel waveguide with a Bragg grating showed diffraction efficiency of 18.0 dB and 18.7 dB for TE- and TM-like modes, respectively. The diffraction efficiencies and wavelengths for both modes never changed after heat treatment at 500 degrees C, whereas the conventional photo-induced grating decayed even at 200 degrees C.
authors.forename: Hiroaki
authors.initials: H
authors.lastname: Nishiyama
authors.forename: Isamu
authors.initials: I
authors.lastname: Miyamoto
authors.forename: Shin-Ichi
authors.initials: S
authors.lastname: Matsumoto
authors.forename: Mitsunori
authors.initials: M
authors.lastname: Saito
authors.forename: Kenji
authors.initials: K
authors.lastname: Kintaka
authors.forename: Junji
authors.initials: J
authors.lastname: Nishii