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Applied Optics

Applied Optics


  • Editor: Joseph N. Mait
  • Vol. 52, Iss. 22 — Aug. 1, 2013
  • pp: 5393–5397

Direct period measurement for fiber Bragg grating using an optical imaging technique

M. M. Ali, K. S. Lim, H. Z. Yang, W. Y. Chong, W. S. Lim, and H. Ahmad  »View Author Affiliations

Applied Optics, Vol. 52, Issue 22, pp. 5393-5397 (2013)

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This paper proposes an approach based on an optical imaging technique for the period measurement of fiber Bragg gratings (FBG). The simple, direct technique involves a differential interface contrast (DIC) microscope and a high-resolution CCD camera. Image processing is performed on the microscope images to obtain low-noise grating profiles and then the grating periods. Adopting a large image sample size in the image processing can reduce uncertainty. During the investigation, FBGs of different grating periods are fabricated by prestraining the photosensitive fibers during the UV-writing process. A good linearity between the measured Bragg wavelengths and grating periods is observed and the measured strain—optics coefficient was found to be in agreement with reported literature.

© 2013 Optical Society of America

OCIS Codes
(060.2300) Fiber optics and optical communications : Fiber measurements
(100.0100) Image processing : Image processing
(060.3735) Fiber optics and optical communications : Fiber Bragg gratings

ToC Category:
Fiber Optics and Optical Communications

Original Manuscript: May 22, 2013
Revised Manuscript: June 26, 2013
Manuscript Accepted: June 29, 2013
Published: July 24, 2013

M. M. Ali, K. S. Lim, H. Z. Yang, W. Y. Chong, W. S. Lim, and H. Ahmad, "Direct period measurement for fiber Bragg grating using an optical imaging technique," Appl. Opt. 52, 5393-5397 (2013)

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