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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 15, Iss. 4 — Feb. 19, 2007
  • pp: 1823–1831

Optical add-drop filters based on photonic crystal ring resonators

Zexuan Qiang, Weidong Zhou, and Richard A. Soref  »View Author Affiliations

Optics Express, Vol. 15, Issue 4, pp. 1823-1831 (2007)

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We present here an optical add-drop filter (ADF) design based on ultra-compact photonic crystal ring resonators (PCRRs). The normalized transmission spectra for single-ring and dual-ring configurations have been investigated by using the two-dimensional finite-difference time-domain (FDTD) technique in a square lattice dielectric-rod photonic-crystal structure. With the introduction of four scatterers at the corners of quasi-square-ring PCRR, high wavelength selectivity and close to 100% drop efficiency can be obtained. Both backward- and forward-dropping were achieved by controlling the coupling efficiency between two PCRR rings for resonant modes with different symmetry. The resonant-mode quality factor Q and the wavelength tunability were also analyzed, opening opportunities for PCRRs as ultra-compact filters, optical add-drop multiplexers, electrooptical N × N switches and electrooptical modulators.

© 2007 Optical Society of America

OCIS Codes
(060.1810) Fiber optics and optical communications : Buffers, couplers, routers, switches, and multiplexers
(130.3130) Integrated optics : Integrated optics materials
(230.0230) Optical devices : Optical devices
(230.7390) Optical devices : Waveguides, planar
(250.5300) Optoelectronics : Photonic integrated circuits

ToC Category:
Photonic Crystals

Original Manuscript: November 30, 2006
Revised Manuscript: February 2, 2007
Manuscript Accepted: February 4, 2007
Published: February 19, 2007

Zexuan Qiang, Weidong Zhou, and Richard A. Soref, "Optical add-drop filters based on photonic crystal ring resonators," Opt. Express 15, 1823-1831 (2007)

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