• DOI:10.1364/AO.52.005393
• Corpus ID: 43830037

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

@article{Ali2013DirectPM,
  title={Direct period measurement for fiber Bragg grating using an optical imaging technique.},
  author={M. M. Ali and K. S. Lim and H. Z. Yang and Wu Yi Chong and W S Lim and Harith Ahmad},
  journal={Applied optics},
  year={2013},
  volume={52 22},
  pages={
          5393-7
        }
}

• M. M. Ali, K. Lim, +3 authors H. Ahmad
• Published 1 August 2013
• Physics
• Applied optics

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.