方形光子晶体光纤光栅传感特性研究

ccording to the transmission theory of step-index single-mode optical fiber, the text analysis square photonic crystal fiber grating mode resonant characteristics. The reflection spectra of this photonic crystal fiber grating (PCFBG) were computed and simulated by coupled-mode method and transmission matrix method. The simulation result of its fundamental mode resonant wavelength is 1558.75nm. It focuses on the structure in the single-mode, the movement of resonance center wavelength in different outside conditions like temperature sensing, stress sensing, and temperature / stress sensing,the result draws a high accuracy temperature sensitivity (0.011806nm/ ) and stress sensitivity (0.01226nm/u ),the effective refractive index of fundamental mode has a greater influence on temperature sensing characteristics and the grating period is the same on stress sensing characteristics.