Optical fiber temperature sensor with single sagnac interference loop based on vernier effect

A novel optical fiber temperature sensor with single sagnac loop based on vernier effect has been proposed. The sensitivity of the sensor enhances obviously based on vernier effect. The experimental temperature sensitivity is -2.147 nm/O which is 13.17 times higher than that of the single sagnac sensor without vernier effect. This sensor has a simple structure and can be applied widely.