Passband broadening of arrayed waveguide filters that are compatible with singlemode fibre is demonstrated using an integrated multimode interference coupler at the entrance to the star coupler. An 8 × 1.6 nm filter is realised for the 1.55 µm band with 0.75 nm-wide –1 dB passbands and –20 dB rejection at >1.7 nm bandwidth.
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Amersfoort et al. (1996) studied this question.
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