Fabrication of coherent optical transversal filter consisting of MMI splitter/combiner and thermo-optic amplitude and phase controllers

Author

Okamoto, K. ; Yamada, H. ; Goh, T.

Author_Institution

NTT Photonics Labs., Ibaraki, Japan

Volume

35

Issue

16

fYear

1999

fDate

8/5/1999 12:00:00 AM

Firstpage

1331

Lastpage

1332

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. Sine-type and Gaussian-type spectral filter responses have been successfully realised showing good agreement with theoretical characteristics

Keywords

integrated optics; interference filters; optical delay lines; optical phase shifters; optical waveguide filters; power combiners; Gaussian-type spectral filter response; MMI splitter/combiner; arbitrary filter characteristics; coherent optical transversal filter; delay arms; fixed path length difference; integrated optics; multimode interference; phase shifters; signal splitting; sine-type spectral filter response; tapped signals; thermo-optic amplitude controller; thermo-optic phase controller;

fLanguage

English

Journal_Title

Electronics Letters

Publisher

iet

ISSN

0013-5194

Type

jour

DOI

10.1049/el:19990940

Filename

790033