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Optics Letters

Optics Letters


  • Editor: Alan E. Willner
  • Vol. 34, Iss. 3 — Feb. 1, 2009
  • pp: 280–282

Adiabaticity criterion and the shortest adiabatic mode transformer in a coupled-waveguide system

Xiankai Sun, Hsi-Chun Liu, and Amnon Yariv  »View Author Affiliations

Optics Letters, Vol. 34, Issue 3, pp. 280-282 (2009)

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By analyzing the propagating behavior of the supermodes in a coupled-waveguide system, we have derived a universal criterion for designing adiabatic mode transformers. The criterion relates ε, the fraction of power scattered into the unwanted mode, to waveguide design parameters and gives the shortest possible length of an adiabatic mode transformer, which is approximately 2 π ε 1 2 times the distance of maximal power transfer between the waveguides. The results from numerical calculations based on a transfer-matrix formalism support this theory very well.

© 2009 Optical Society of America

OCIS Codes
(060.1810) Fiber optics and optical communications : Buffers, couplers, routers, switches, and multiplexers
(130.2790) Integrated optics : Guided waves
(130.3120) Integrated optics : Integrated optics devices
(230.7370) Optical devices : Waveguides

ToC Category:
Integrated Optics

Original Manuscript: October 8, 2008
Revised Manuscript: December 7, 2008
Manuscript Accepted: December 8, 2008
Published: January 26, 2009

Xiankai Sun, Hsi-Chun Liu, and Amnon Yariv, "Adiabaticity criterion and the shortest adiabatic mode transformer in a coupled-waveguide system," Opt. Lett. 34, 280-282 (2009)

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