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Applied Optics

Applied Optics


  • Vol. 41, Iss. 30 — Oct. 20, 2002
  • pp: 6351–6355

Long-period gratings in planar optical waveguides

Vipul Rastogi and Kin Seng Chiang  »View Author Affiliations

Applied Optics, Vol. 41, Issue 30, pp. 6351-6355 (2002)

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We present a theoretical analysis of light propagation in a four-layer planar waveguide that consists of a long-period grating (LPG) having a period of the order of 100 µm. By means of the coupled-mode theory, we show that such a structure is capable of coupling light from the fundamental guided mode to the cladding modes at specific wavelengths (resonance wavelengths) and thus results in sharp rejection bands in the transmission spectrum of the waveguide. Our numerical results show that the resonance wavelengths as well as the transmission spectrum can be significantly changed with the waveguide and grating parameters. A waveguide-based LPG should provide a useful approach to the design of a wide range of integrated-optic devices, including wavelength-tunable filters, switches, and environmental sensors.

© 2002 Optical Society of America

OCIS Codes
(060.2340) Fiber optics and optical communications : Fiber optics components
(130.0130) Integrated optics : Integrated optics
(130.3120) Integrated optics : Integrated optics devices
(130.6010) Integrated optics : Sensors
(350.2770) Other areas of optics : Gratings

Original Manuscript: January 4, 2002
Revised Manuscript: July 26, 2002
Published: October 20, 2002

Vipul Rastogi and Kin Seng Chiang, "Long-period gratings in planar optical waveguides," Appl. Opt. 41, 6351-6355 (2002)

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