In order to improve the measurement accuracy of Bragg wavelength drift, this paper proposes a processing technology based on FP tunable filter and wavelength reference, using interpolation-correlation spectrum method, that is, firstly, some points are linearly inserted between each two adjacent points in the original spectrum, and then the Bragg wavelength drift is obtained by correlation spectrum method. This method can not only effectively suppress noise, but also accurately measure the Bragg wavelength drift, thereby realizing high-precision measurement of external parameters such as temperature and strain.
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