Gain limit in erbium-doped fiber amplifiers due to internal Rayleigh backscattering

@article{Hansen1992GainLI,
  title={Gain limit in erbium-doped fiber amplifiers due to internal Rayleigh backscattering},
  author={S. L. Hansen and K. Dybdal and C C Larsen},
  journal={IEEE Photonics Technology Letters},
  year={1992},
  volume={4},
  pages={559-561}
}
A very high gain of 51 dB in a single Er-doped fiber is reported. A significant amount of amplified Rayleigh backscattering is also observed. This is predicted to impose an upper limit of 57-70 dB of achievable gain for the investigated fibers. By the insertion of an isolator, a gain of 54 dB is observed.<<ETX>>