Fabrication of coherent optical transversal filterconsisting of MMIsplitter/combiner and thermo-optic amplitude and phase controllers
- 5 August 1999
- journal article
- Published by Institution of Engineering and Technology (IET) in Electronics Letters
- Vol. 35 (16) , 1331-1332
- https://doi.org/10.1049/el:19990940
Abstract
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.Keywords
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