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

作者：Ali M M; Lim K S^*; Yang H Z; Chong W Y; Lim W S; Ahmad H

来源：Applied Optics, 2013, 52(22): 5393-5397.

DOI：10.1364/AO.52.005393

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.

• 出版日期2013-8-1
• 单位西北大学