Brillouin frequency shift in a single-mode optical fiber has been measured as a function of tensile strain. The strain coefficient of normalized Brillouin frequency shift C ≡ (dνB/dε)/νB is found to be 4.4 for silica fibers. This result shows the potential of Brillouin spectroscopy to evaluate tensile strain in the fiber with the strain resolution of about 2 × 10-4. The origin of the large strain coefficient is discussed.
ASJC Scopus subject areas