首页|Optical wavelength dependence of strain sensitivity of FBG inscribed in perfluorinated plastic optical fibers
Optical wavelength dependence of strain sensitivity of FBG inscribed in perfluorinated plastic optical fibers
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NSTL
We measure the strain dependence of multiple Bragg wavelengths (corresponding to different diffraction orders) of a fiber Bragg grating (FBG) inscribed in a perfluorinated graded-index plastic optical fiber (PFGI-POF) in the wavelength range up to 1550 nm. Based on this result, we show that the fractional sensitivity, which has been conventionally used as a wavelength-independent index for fair comparison of the FBG performance measured at different wavelengths, is dependent on wavelength in this range. The reason of this behavior seems to originate from the non-negligible wavelength dependence of refractive index and its strain-dependence coefficient. Using the wavelength dependence of the refractive index already reported for bulk, we deduce the wavelength dependence of the strain coefficient of the refractive index. This information will be a useful archive in implementing PFGI-POF-based strain sensors based not only on FBGs but also on Brillouin scattering in future.
NSTL
