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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 18, Iss. 9 — Apr. 26, 2010
  • pp: 9341–9350

Blue-shifted contra-directional coupling between a periodic and conventional dielectric waveguides

Linfang Shen, Xudong Chen, Xufeng Zhang, and Li Pan  »View Author Affiliations

Optics Express, Vol. 18, Issue 9, pp. 9341-9350 (2010)

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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

OCIS Codes
(060.1810) Fiber optics and optical communications : Buffers, couplers, routers, switches, and multiplexers
(130.2790) Integrated optics : Guided waves
(260.2030) Physical optics : Dispersion
(050.5298) Diffraction and gratings : Photonic crystals

ToC Category:
Photonic Crystals

Original Manuscript: January 4, 2010
Revised Manuscript: March 26, 2010
Manuscript Accepted: April 12, 2010
Published: April 20, 2010

Linfang Shen, Xudong Chen, Xufeng Zhang, and Li Pan, "Blue-shifted contra-directional coupling between a periodic and conventional dielectric waveguides," Opt. Express 18, 9341-9350 (2010)

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