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Optics Letters

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  • Editor: Alan E. Willner
  • Vol. 35, Iss. 4 — Feb. 15, 2010
  • pp: 484–486

Thermally tunable lithium-niobate long-period waveguide grating filter fabricated by reactive ion etching

Wei Jin, Kin Seng Chiang, and Qing Liu  »View Author Affiliations


Optics Letters, Vol. 35, Issue 4, pp. 484-486 (2010)
http://dx.doi.org/10.1364/OL.35.000484


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Abstract

We fabricate a long-period grating band-rejection filter with a lithium niobate ( LiNbO 3 ) channel waveguide, where the grating is formed on the waveguide surface by plasma reactive ion etching. The filter shows three distinct thermal tuning regimes. Below 55 ° C , the center wavelength of the rejection band decreases linearly with an increase in the temperature at a high sensitivity ( 1.4   nm / ° C ) . The temperature sensitivity drops abruptly to a negligible value at 55 ° C and stays low up to 70 ° C , above which it jumps abruptly to a large positive value ( 1.6   nm / ° C ) . We attribute these peculiar tuning characteristics to the formation of different crystal phases in the core and cladding areas of the LiNbO 3 waveguide and the abrupt transitions of the thermo-optic coefficients of some crystal phases. The grating could be developed into various kinds of integrated-optic filters and switches for application in optical signal processing.

© 2010 Optical Society of America

OCIS Codes
(050.2770) Diffraction and gratings : Gratings
(130.3730) Integrated optics : Lithium niobate
(230.7370) Optical devices : Waveguides
(130.7408) Integrated optics : Wavelength filtering devices
(230.7408) Optical devices : Wavelength filtering devices

ToC Category:
Integrated Optics

History
Original Manuscript: September 17, 2009
Revised Manuscript: December 15, 2009
Manuscript Accepted: December 23, 2009
Published: February 4, 2010

Citation
Wei Jin, Kin Seng Chiang, and Qing Liu, "Thermally tunable lithium-niobate long-period waveguide grating filter fabricated by reactive ion etching," Opt. Lett. 35, 484-486 (2010)
http://www.opticsinfobase.org/ol/abstract.cfm?URI=ol-35-4-484


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