In the FBG demodulation system applying HCN absorption lines as wavelength reference, the output of ASE broadband light source is controlled by tunable F-P filter to provide scanning light for the whole demodulation system. However, due to the influence of the tunable F-P filter in the system, the HCN absorption lines are distorted, including broadening, shallowness and asymmetry, which affect the subsequent determination of peak position, thus reducing the demodulation. In this paper, the broadening, shallowness and asymmetric distortion of HCN absorption spectrum caused by F-P filter are studied and analyzed.
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