A passive all-fibre technique for Bragg wavelength shift detection is presented which can be considered as the minimum configuration for fibre grating sensing demodulation. The scheme involves a light source with a particular spectral profile that allows the direct tracking of Bragg wavelength shifts. Referencing to source power fluctuations is also provided. This simple technique shows satisfactory resolution over a large dynamic range. Experimental results are presented for temperature and strain measurements.
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Ferreira et al. (1996) studied this question.
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