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Optics Letters

Optics Letters


  • Vol. 28, Iss. 9 — May. 1, 2003
  • pp: 686–688

Theory and practice of long-period gratings: when a loss becomes a gain

Xavier Daxhelet and Mykola Kulishov  »View Author Affiliations

Optics Letters, Vol. 28, Issue 9, pp. 686-688 (2003)

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Losses of cladding modes are part of the mechanism of operation of a long-period grating (LPG) when it is used as an optical filter. We present a LPG computer simulation that accounts for these losses. On the basis of this simulation, we show that losses result in qualitatively different LPG spectral behavior. There is an optimal loss value that provides sidelobe-free, 100% power transfer from the core to the cladding mode for a uniform LPG. We obtained a simple equation that relates this optimum loss value to the LPG length and the cross-coupling coefficient. Based on the results, we propose new approaches to LPG design in a fiber as well as in waveguide platforms for fiber-optic communication and sensor applications. A design of a LPG reconfigurable filter is suggested.

© 2003 Optical Society of America

OCIS Codes
(050.1950) Diffraction and gratings : Diffraction gratings
(130.2790) Integrated optics : Guided waves
(130.3120) Integrated optics : Integrated optics devices
(160.2100) Materials : Electro-optical materials
(230.2090) Optical devices : Electro-optical devices
(230.7400) Optical devices : Waveguides, slab

Xavier Daxhelet and Mykola Kulishov, "Theory and practice of long-period gratings: when a loss becomes a gain," Opt. Lett. 28, 686-688 (2003)

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  3. V. Rastogi and K. S. Chiang, Appl. Opt. 41, 6351 (2002).
  4. M. Kulishov and X. Daxhelet, J. Opt. Soc. Am. A 19, 1632 (2002).
  5. H. Jeong and K. Oh, Opt. Commun. 199, 103 (2001).

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