Random Fiber Lasers and Application


  Random fiber laser (RFL) based on random distributed Rayleigh scattering and Raman amplification effect is emerging as a new research highlight in fiber lasers. Our group has obtained some progresses about random fiber laser in recent years: more than 20 papers were published in well-known publications such as OSA and IEEE, including 1 ESI highly cited paper. These works were supported by National Natural Science Foundation of Key Projects.
  Compared with previously reported RFLs, lasing threshold in half-open cavity RFL was greatly reduced. For the first time, we had achieved random lasing by using ultra-long fiber ring cavity structure. The output characteristics and stability were also analyzed. In point sensing applications based on fiber Bragg grating, optical signal to noise ratio (OSNR) more than 20 dB over 100 km was achieved. Furthermore, we applied the 1st and 2nd -order random fiber laser to the Brillouin optical time domain analyzer (BOTDA) sensing system. We set a record for sensing distance, where over 122km with a temperature resolution of ±1℃ and a spatial resolution of ±2 m was achived.