The fabrication of an integrated-optic coherent transversal filter which is capable of synthesising almost arbitrary filter characteristics is reported. The transversal filter consists of a multimode interference (MMI) splitter for 1 × N signal splitting, delay arms with fixed path length difference, thermo-optic switches and phase shifters for arbitrarily weighting the signal and MMI N × 1 combiner to combine N tapped signals. Sinc-type and Gaussian-type spectral filter responses have been successfully realised showing good agreement with theoretical characteristics.
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Okamoto et al. (1999) studied this question.
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