Effect of Rayleigh-scattering distributed feedback on multiwavelength Raman fiber laser generation

Abstract
We experimentally demonstrate a Raman fiber laser based on multiple point-action fiber Bragg grating reflectors and distributed feedback via Rayleigh scattering in an ~22-km-long optical fiber. Twenty-two lasing lines with spacing of 100GHz (close to International Telecommunication Union grid) in the C band are generated at the watt level. In contrast to the normal cavity with competition between laser lines, the random distributed feedback cavity exhibits highly stable multiwavelength generation with a power-equalized uniform distribution, which is almost independent on power.
Funding Information
  • Engineering and Physical Sciences Research Council (EPSRC) (EP/E015646/1)
  • Russian Ministry of Education and Science