We demonstrate the highest-quality Bragg gratings reported to date in chalcogenide glass rib waveguides, both in strength and apodization. A modified Sagnac interferometer is employed to write gratings in ${\mathrm{As}}_2{\mathrm{S}}_3$ -based rib waveguides, achieving an induced refractive index modulation of the order of ${10}^{-2}$ and a grating transmission rejection of more than $30\mathrm{dB}$ . We obtain good agreement between experimental and theoretical results based on a transfer-matrix formulation for multilayer optical structures. In addition, we report fabrication of phase-shifted Bragg gratings, as well as an investigation of the role of birefringence, higher-order modes, and aging. Finally, grating growth dynamics are investigated by in situ monitoring during writing.

© 2006 Optical Society of America

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