The resonance equation of the sampled fiber Bragg gratings is derived through the Fourier′s transform and the coupled-mode theory, which determine the wavelengths of the resonance peaks.
利用傅里叶变换和耦合模理论得到了取样布拉格光纤光栅的谐振方程，确定了其多谐振峰的位置。
2
The fiber Bragg grating used for simultaneous measurement of strain and temperature was written on the joint of two different fibers, and has two reflection peaks at different wavelength.