The Characterization of the Double Fiber Bragg Gratings Fiber RingLaser and Its Applications in Real Time Fiber Sensing System

摘要

We demonstrate a fiber sensing system by using a fiber resonator which is formed by two fiber Bragg gratings. It is ableto measure real time strain and stress directly by the variation of the intensity of the output power due to the modulationin the fiber resonator. It shows that recording of the strain variation can be achieved as high as 2K Hz. The frequencyresponse, signal noise ratio, and maximum range of the sensing system are studied with various reflectivity of the FBG,and the coupling ratios of the couplers used in the system.