The temperature dependence of the spectral response of Bragg grating filters at 1550 nm, written in single-mode planar waveguides of As2S3 chalcogenide glasses, is presented. It was found that Bragg reflectance increases with temperature (corresponding to an increase as high as 4 dB of the transmission depth, from 20 °C to 50 °C), whereas the resonant wavelength shifts by ∼1 nm. The difference between temperature dependence of the structural properties for exposed and unexposed areas is thought to be responsible for the increase of refractive-index modulation depth. Two experimental techniques are used to further study the observed phenomena.
© 2000 Optical Society of America
(050.7330) Diffraction and gratings : Volume gratings
(120.6780) Instrumentation, measurement, and metrology : Temperature
(160.2750) Materials : Glass and other amorphous materials
(230.1480) Optical devices : Bragg reflectors
(230.7400) Optical devices : Waveguides, slab
Ali Saliminia, Tigran Galstian, Alain Villeneuve, Karine Le Foulgoc, and Kathleen Richardson, "Temperature dependence of Bragg reflectors in chalcogenide As2S3 glass slab waveguides," J. Opt. Soc. Am. B 17, 1343-1348 (2000)