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When a photosensitive (PS) fiber is exposed to UV-irradiation, a permanent refractive index change is induced in the core. As a result, according to Kramers-Kronig relations, the absorption coefficient (α) is also increased. This increment of the absorption can lead to a significant heating of the fiber when it is illuminated by a moderate optical power. Thermal effects may produce spectral changes...
The resonance wavelength of whispering gallery modes (WGM) of an optical fiber shifts as a function of the fiber temperature. Monitoring the shift of a given WGM resonance at different positions of a fiber component gives direct information on the thermal effects produced in it. This information is particularly important in fiber power systems. Thermal effects in fiber Bragg gratings are investigated...
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