Two modes of the chirped grating also occurs coupling

on the coupled mode theory of chirped fiber grating

in order to understand physical and sensing characteristics of chirped grating and improve precision of reflectance spectrum in-depth study must be done. Through the coupling equations of chirp grating

take appropriate coordinate transformation

and numerical simulation research is carried out using Matlab

influences of chirp grating coupling models on chirped fiber grating reflectance spectrum when in different refractive index modulation

different grating length

different grating period

and chirp coefficient are respectively discussed

and chirp grating spectrum features are further studied.