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Optica Publishing Group
  • Journal of Lightwave Technology
  • Vol. 23,
  • Issue 9,
  • pp. 2740-
  • (2005)

Design of Photonic-Crystal and Wire Waveguide Interface

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Abstract

The coupling of light between wire-dielectric and photonic-crystal waveguides, characterized by a triangular lattice of air holes, is investigated through a finite-element time domain (FE-TD) approach, in order to optimize the transmission spectrum. The displacement of the inner-hole rows of the photonic-crystal waveguide, on both sides of the interface, has been shown to considerably improve the coupling, resulting in transmission values higher than 90% and 95% over bandwidths of hundreds of nanometers around 1550 nm. The new design approach is successfully proposed for input and output waveguides with width equal to sqrt{3}Lambda, as well as for larger widths, like 2sqrt{3}Lambda and 3sqrt{3}Lambda, with Lambda being the period of the photonic crystal.

© 2005 IEEE

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