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Journal of the Optical Society of America B

Journal of the Optical Society of America B


  • Editor: Henry M. Van Driel
  • Vol. 25, Iss. 1 — Jan. 1, 2008
  • pp: 67–73

Optimization of a 60° waveguide bend in InP-based 2D planar photonic crystals

Patric Strasser, Glen Stark, Franck Robin, Daniel Erni, Katharina Rauscher, Robert Wüest, and Heinz Jäckel  »View Author Affiliations

JOSA B, Vol. 25, Issue 1, pp. 67-73 (2008)

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We present a novel design for a W 1 (one missing row of holes) waveguide 60° bend implemented in a substrate-type In P In Ga As P In P planar photonic crystal based on a triangular array of air holes. The bend has been designed to provide high transmission over a large bandwidth. The investigated design improvement relies only on displacing holes while avoiding changing individual holes diameter in the interest of better process control (homogenous hole depth). Two-dimensional (2D) finite-element simulations were used to increase the relative transmission bandwidth from 18% to 40% of the photonic bandgap for unoptimized and optimized 60° bends, respectively. The 2D results were verified by means of rigorous three-dimensional (3D) finite-difference time-domain (FDTD) simulations. We show that excellent agreement between 2D and 3D simulations can be obtained, provided a small effective-index shift of 0.024 ( 0.74 % ) and an imaginary loss parameter ( ϵ = 0.014 ) is introduced in the 2D simulations. To demonstrate the applicability of our improved design, the bend was fabricated and measured using the endfire technique. A bending loss of 3 dB is obtained for the optimized W 1 waveguide bend compared to more than 8 dB in the unoptimized case.

© 2008 Optical Society of America

OCIS Codes
(130.3120) Integrated optics : Integrated optics devices
(230.3120) Optical devices : Integrated optics devices
(230.7370) Optical devices : Waveguides

ToC Category:
Photonic Crystals

Original Manuscript: September 4, 2007
Manuscript Accepted: October 7, 2007
Published: December 21, 2007

Patric Strasser, Glen Stark, Franck Robin, Daniel Erni, Katharina Rauscher, Robert Wüest, and Heinz Jäckel, "Optimization of a 60° waveguide bend in InP-based 2D planar photonic crystals," J. Opt. Soc. Am. B 25, 67-73 (2008)

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