Synthesis of codirectional couplers with ultralow sidelobes and minimum bandwidth
- 1 June 1995
- journal article
- Published by Optica Publishing Group in Optics Letters
- Vol. 20 (11) , 1259-1261
- https://doi.org/10.1364/ol.20.001259
Abstract
A general variational optimization procedure is used to synthesize codirectional couplers with arbitrary sidelobe suppression down to −125 dB. Apodization shapes yielding sidelobe levels over the range of −40 dB to −75 dB are given by a single design formula. The limiting performance in terms of sidelobe suppression versus the bandwidth of passive evanescent-type couplers is found.Keywords
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