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Journal of the Optical Society of America B

Journal of the Optical Society of America B


  • Editor: Henry Van Driel
  • Vol. 26, Iss. 11 — Nov. 1, 2009
  • pp: 2136–2142

Effect of writing beam spatial coherence on fiber Bragg grating modulation contrast and thermal stability

Lingyun Xiong and Jacques Albert  »View Author Affiliations

JOSA B, Vol. 26, Issue 11, pp. 2136-2142 (2009)

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We present a method to fabricate fiber Bragg gratings with adjustable refractive index contrast by using the standard phase mask technique. A theoretical analysis of the diffracted field from the phase mask is performed by considering the effect of the spatial coherence of the incident UV beam. The numerical results show that the grating index contrast decreases as the separation between the fiber and the phase mask increases. Strong gratings with various index contrasts have been inscribed in hydrogen-loaded single mode fibers at different writing distances, and the measured index contrast values are in good agreement with the simulation results. Furthermore, thermal decay tests on the gratings demonstrate that the thermal stability of the grating reflectivity is improved for those gratings fabricated at larger separations between the fiber and the phase mask. These results suggest a one-step process to fabricate gratings with an enhanced thermal stability.

© 2009 Optical Society of America

OCIS Codes
(030.1640) Coherence and statistical optics : Coherence
(120.6780) Instrumentation, measurement, and metrology : Temperature
(120.6810) Instrumentation, measurement, and metrology : Thermal effects
(060.3735) Fiber optics and optical communications : Fiber Bragg gratings
(060.3738) Fiber optics and optical communications : Fiber Bragg gratings, photosensitivity

ToC Category:
Fiber Optics and Optical Communications

Original Manuscript: July 17, 2009
Revised Manuscript: September 8, 2009
Manuscript Accepted: September 14, 2009
Published: October 26, 2009

Lingyun Xiong and Jacques Albert, "Effect of writing beam spatial coherence on fiber Bragg grating modulation contrast and thermal stability," J. Opt. Soc. Am. B 26, 2136-2142 (2009)

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