Abstract
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.
Original language | English |
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Pages (from-to) | 5393-5397 |
Number of pages | 5 |
Journal | Applied Optics |
Volume | 52 |
Issue number | 22 |
DOIs | |
Publication status | Published - 1 Aug 2013 |
Externally published | Yes |