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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 15, Iss. 18 — Sep. 3, 2007
  • pp: 11278–11284

Bandpass filters based on phase-shifted photonic crystal waveguide gratings

Chao Chen, Xuechun Li, Hanhui Li, Kun Xu, Jian Wu, and Jintong Lin  »View Author Affiliations

Optics Express, Vol. 15, Issue 18, pp. 11278-11284 (2007)

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In this paper, a bandpass transmission filter realized in phase-shifted waveguide gratings based on photonic crystals (PCs) is proposed. Phase-shift regions each composed of one period of photonic crystal (PC) waveguide are incorporated into PC waveguide gratings. The magnitudes of the phase-shifts are modified by involving small changes in the size of the border rods in the phase-shift regions. Using standard coupled-mode theory and finite-difference time-domain (FDTD) method, we show that by properly choosing the magnitudes of phase-shifts and the lengths of waveguide gratings, a flat-top and sharp roll-off response with a narrow bandwidth is theoretically and numerically achieved by the designed filter. A further analysis shows that the center frequency of the transmission band can be changed by altering the magnitude of the phase-shift and the response performance exhibits relaxed sensitivity to the phase-shift variation. As a specific application, we theoretically demonstrate a third-order Chebyshev bandpass filter based on compound phase-shifted PC waveguide gratings. The filter performance is suitable for dense wavelength-division-multiplexed (DWDM) optical communication systems with a channel spacing of 100-GHz.

© 2007 Optical Society of America

OCIS Codes
(050.2770) Diffraction and gratings : Gratings
(050.5080) Diffraction and gratings : Phase shift
(060.4510) Fiber optics and optical communications : Optical communications

ToC Category:
Photonic Crystals

Original Manuscript: June 19, 2007
Revised Manuscript: July 17, 2007
Manuscript Accepted: July 24, 2007
Published: August 22, 2007

Chao Chen, Xuechun Li, Hanhui Li, Kun Xu, Jian Wu, and Jintong Lin, "Bandpass filters based on phase-shifted photonic crystal waveguide gratings," Opt. Express 15, 11278-11284 (2007)

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