Role of the FBG's bandwidth in long distance point sensing system based on random fiber laser

We study the influence of the fiber Bragg grating (FBG)'s bandwidth on the performance of the long distance point sensing system based on random fiber laser. The results show that the optical signal-to-noise ratio (OSNR) decreases gradually when the bandwidth of the FBG increases by simulation, under the same pump power, which is demonstrated by the experiment. This work could provide a reference for designing a long-distance optical fiber sensing system.