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The manufactured spectrum of fibre Bragg grating (FBG) is presented in Fig. 5.1. It was used as the initial/reference reading of every measurement, for both transmission and reflection spectra. The center wavelength or the Bragg wavelength, λB, was measured as 1553.865 nm with 0.24 nm bandwidth. Figures 5.2 and 5.3 show the transmission and reflection spectra of FBG taken at room temperature (23 ± 1 °C).