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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 20, Iss. 20 — Sep. 24, 2012
  • pp: 22018–22033

Modified Maxwell fish-eye approach for efficient coupler design by graded photonic crystals

H. Kurt, B. B. Oner, M. Turduev, and I. H. Giden  »View Author Affiliations

Optics Express, Vol. 20, Issue 20, pp. 22018-22033 (2012)

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We present a novel design of two dimensional graded index medium that provides coupling of light with high coupling efficiency between two planar dielectric waveguides of different widths (15.46μm vs. 2.21μm). Poor light coupling performance of butt-coupler can be mitigated by implementing tapered coupler at the expense of long coupler section. In order to reduce coupling losses, a new coupling device approach based on graded index (GRIN) concept is proposed. The refractive index distribution is in the form of modified version of the Maxwell fish-eye lens. The inhomogeneous refractive index distribution is approximated by photonic crystals (PCs) such that the positions of each PC rods are appropriately arranged. Strong electric field focusing ability of the designed GRIN PC medium provides relatively high coupling efficiency that is around 90%. Spectral region corresponding to coupling efficiency over 75% has a bandwidth of Δω = 18.56% (284 nm). Finally, we discuss the durability of the proposed coupler against the lateral displacement and angular misalignment of output waveguides.

© 2012 OSA

OCIS Codes
(110.2760) Imaging systems : Gradient-index lenses
(230.3120) Optical devices : Integrated optics devices
(230.7390) Optical devices : Waveguides, planar
(250.5300) Optoelectronics : Photonic integrated circuits
(160.5298) Materials : Photonic crystals

ToC Category:
Photonic Crystals

Original Manuscript: June 29, 2012
Revised Manuscript: August 29, 2012
Manuscript Accepted: September 6, 2012
Published: September 11, 2012

H. Kurt, B. B. Oner, M. Turduev, and I. H. Giden, "Modified Maxwell fish-eye approach for efficient coupler design by graded photonic crystals," Opt. Express 20, 22018-22033 (2012)

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