Design of Photonic Crystal Directional Coupler with High Extinction Ratio and Small Coupling Length

As one of the key component of photonic crystal optical circuit devices, the directional coupler is investigated. We explain the reason the directional coupler consisting of an ordinary symmetric parallel waveguide cannot have a high extinction ratio and a small coupling length simultaneously. To re...

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Bibliographic Details
Published inJapanese Journal of Applied Physics Vol. 44; no. 4S; p. 2575
Main Authors Yamamoto, Noritsugu, Watanabe, Yoshinori, Komori, Kazuhiro
Format Journal Article
LanguageEnglish
Published 01.04.2005
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Summary:As one of the key component of photonic crystal optical circuit devices, the directional coupler is investigated. We explain the reason the directional coupler consisting of an ordinary symmetric parallel waveguide cannot have a high extinction ratio and a small coupling length simultaneously. To realize both characteristics simultaneously, we propose a novel directional coupler structure. By numerical calculation, we show the possibility of a directional coupler with a high extinction ratio (-24 dB) and a small coupling length (18a).
ISSN:0021-4922
1347-4065
DOI:10.1143/JJAP.44.2575