As a common optical element, fiber

As a common optical element, fiber grating is widely used in many optical sensors fields, such as aeronautics and aerospace, warships, civil engineering, petrochemical
industries, electric appliance, chemical corrosion resistance, medical filed, and so on, because of its merits of smaller volume, resisting of electromagnetic interference,
erosion-proof, high-pressure resistance and high sensitivity. Fiber grating can measure many parameters, including temperature, tension, refractive index, electric current, voltage, etc. But all these can finally be boiled down to sensitivity of temperature, strain and refractive index. Combining with the transfer matrix method and the Runge-Kutta algorithm, the influence of temperature and strain change on transmission characteristics of fiber grating are analyzed, and further the sensitivity of various parameters is analyzed in order to attain optimized design.