Growth Characteristics of Fiber Bragg Gratings Fabricated in High Germania Boron Co-Doped Fiber

S. W. Harun , P. Poopalan and H. Ahmad

doi:10.31436/iiumej.v3i2.365

Authors

S. W. Harun , P. Poopalan and H. Ahmad Department of Physics, Faculty of Science, University of Malaya, 50603, Kuala Lumpur.

DOI:

https://doi.org/10.31436/iiumej.v3i2.365

Abstract

This paper reports and provides an explanation for the growth characteristics of fibre Bragg gratings (FBGs) fabricated in high germania boron co-doped optical fiber by using a continuous wave (CW) doubled frequency Argon ion laser as an UV light source. The grating reflectivity and Bragg wavelength shift as a function of exposure time are measured. The index modulation time is observed to have a good fit to a power law of the form ï„n = Ctb (t is the time, C and b are constants), whereas the exponent b of 0.3 is obtained for the FBGs. The UV laser light also causes a shift of the resonant wavelength with fabrication time. The fastest wavelength shift is shown to be 0.53 nm after 524 seconds exposure.

Keywords: Fiber Bragg grating, Argon ion laser, Phase mask method, Growth characteristics.