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Applied Optics

Applied Optics


  • Vol. 38, Iss. 34 — Dec. 1, 1999
  • pp: 6987–6993

Characteristics of grating-assisted couplers

Nahum Izhaky and Amos Hardy  »View Author Affiliations

Applied Optics, Vol. 38, Issue 34, pp. 6987-6993 (1999)

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Characteristics of grating-assisted coupling between two parallel waveguides are analyzed. The influence of the grating parameters, such as groove depth, duty cycle, and refractive indices is considered. Chirped and parallel gratings as well as gratings with sinusoidal envelope periodicity are also addressed. The analysis is based on a unified coupled-mode formalism, with the transfer-matrix method as a general solution technique. It is shown how to modify the grating parameters to provide a specific spectral response (reflectivity and transmission coefficients). As an example, two parallel gratings are used to obtain a similar response to a single grating of double length. The location of the grating between the two waveguides as well as the light-wave injection direction are very important. The presented methods and effects may be useful for design and analysis in the fields of optical communications, sensing, and processing.

© 1999 Optical Society of America

OCIS Codes
(050.1950) Diffraction and gratings : Diffraction gratings
(050.2770) Diffraction and gratings : Gratings
(130.2790) Integrated optics : Guided waves
(230.7390) Optical devices : Waveguides, planar

Original Manuscript: July 6, 1999
Revised Manuscript: September 3, 1999
Published: December 1, 1999

Nahum Izhaky and Amos Hardy, "Characteristics of grating-assisted couplers," Appl. Opt. 38, 6987-6993 (1999)

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