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The fabrication and operation of Bragg gratings is reported with a view to their suitability for future wavelength-division multiplex (WDM) devices in integrated optical circuits. Crosstalk attenuations of more than 20 dB with respect to the optical power and spectral bandwidths of up to 2.2 nm were achieved. In addition, polarization-independent operation of Bragg gratings, an important qualification for their operation in fiber optical transmission systems, was demonstrated with a filter bandwidth of 0.2 nm at -10 dB and possible channel spacings as Low as 1 nm.

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