Cross sensitivity of temperature in fiber Bragg grating strain sensing

An effective method of passive temperature compensation was introduced and a compensation structure was designed to address the temperature cross sensitivity in the fiber Bragg grating (FBG) strain sensing. The curves of the compensation effect were analyzed with theoretical simulation in different M values. The optimized M value for compensation effect was obtained. The temperature curves in different pre-strains were obtained, the pre-strain value, which compensates the temperature completely, was found out. The phenomena of under-compensation and over-compensation were also analyzed. The temperature cross sensitivity existing in FBG sensing was effectively resolved via this method, and such temperature compensation can meet the demand of temperature stability in fiber sensing and communication.