First-order Bragg grating filters have been realised in GaAs/GaAlAs rib waveguides for operation at λ ̃ 1.5μm. Singlemode devices with rib widths of 2 to 5 μm and incorporating a 2.5 mm length of 225 nm period grating have been evaluated using a tunable T1:KCl colour-centre laser. Rejection ratios of 95% to 39% and 3dB bandwidths of 3.5 Å to 7.9 Å have been measured.
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Yi-Yan et al. (1987) studied this question.
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