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Optics Letters

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  • Vol. 26, Iss. 14 — Jul. 15, 2001
  • pp: 1102–1104

Photonic crystal tapers for ultracompact mode conversion

Thomas D. Happ, Martin Kamp, and Alfred Forchel  »View Author Affiliations


Optics Letters, Vol. 26, Issue 14, pp. 1102-1104 (2001)
http://dx.doi.org/10.1364/OL.26.001102


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Abstract

We have studied the coupling of a classic ridge waveguide with a two-dimensional photonic crystal (PC) waveguide, using finite-difference time-domain calculations. The ridge waveguide exhibits only a weak refractive-index confinement of light, as it is commonly used in buried-heterostructure or ridge-waveguide lasers. The light is coupled to a PC waveguide that consists of one missing row along the ΓK direction in a triangular lattice of air cylinders in AlGaAs. We compare various designs for PC tapers with that of a classic taper and for butt coupling. The calculation yields high coupling efficiency that exceeds 80% for a 2.5-µm-long PC taper. In addition, the dependence of the efficiency on the PC air-fill factor and on alignment tolerances is analyzed.

© 2001 Optical Society of America

OCIS Codes
(130.3120) Integrated optics : Integrated optics devices
(250.5300) Optoelectronics : Photonic integrated circuits

Citation
Thomas D. Happ, Martin Kamp, and Alfred Forchel, "Photonic crystal tapers for ultracompact mode conversion," Opt. Lett. 26, 1102-1104 (2001)
http://www.opticsinfobase.org/ol/abstract.cfm?URI=ol-26-14-1102


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