We demonstrate here a method for the online temperature measurement of the output-coupling fiber Bragg grating (FBG) in a high power fiber oscillator by a superimposed FBG, which is used as the output-coupling FBG and the temperature monitor simultaneously. The experimental results verify the feasibility of this method.
We measured the temperature of a single point using a uniform fiber Bragg grating (FBG) for the first time. A quasi- Gaussian temperature distribution pattern was achieved by heating at the midpoint of FBG, then the spectral characteristics, mainly including the central wavelength and amplitude of the resonance peaks were investigated in detail. Results show that the attenuation of each peaks accords well with the theoretical predictions, so the temperature of midpoint can be demodulated by the analysis of transmission spectra.
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