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Title: Blue-shifted contra-directional coupling between a periodic and conventional dielectric waveguides
Authors: Shen, L.
Chen, X. 
Zhang, X.
Pan, L.
Issue Date: 26-Apr-2010
Citation: Shen, L., Chen, X., Zhang, X., Pan, L. (2010-04-26). Blue-shifted contra-directional coupling between a periodic and conventional dielectric waveguides. Optics Express 18 (9) : 9341-9350. ScholarBank@NUS Repository.
Abstract: The interaction between a periodic and conventional dielectric waveguides is investigated theoretically for a two-dimensional model system. A modified coupled-mode theory is formulated for the considered system and found to agree well with rigorous numerical calculations. It is shown that in a certain wavelength range the contra-directional coupling between the two waveguides can be achieved with high efficiency. But the spectrum of the coupling efficiency is blue-shifted and thus the strongest coupling does not occur in the case when two individual waveguides have the same propagation constant. For such a contra-directional coupling system, the coupling efficiency grows with the coupling length and it tends to 100% (excluding insertion loss) when the coupling length is larger than a certain value, and the coupling window can be largely broaden by reducing the distance between the coupled waveguides. © 2010 Optical Society of America.
Source Title: Optics Express
ISSN: 10944087
DOI: 10.1364/OE.18.009341
Appears in Collections:Staff Publications

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