Narrow-band emission of spectral width down to ∼0.05 nm linewidth is achieved in the random distributed feedback fiber laser employing narrow-band fiber Bragg grating or fiber Fabry-Perot interferometer filters. The observed line-width is ∼10 times less than line-width of other demonstrated up to date random distributed feedback fiber lasers. The random DFB laser with Fabry-Perot interferometer filter provides simultaneously multi-wavelength and narrow-band (within each line) generation with possibility of further wavelength tuning.
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Authors would like to acknowledge the support of the European Research Council, EPSRC, SB RAS partner integration projects, grants of the Russian Ministry of Education and Science, Russian Foundation for Basic Research, Department of General Physics of the Russian Academy of Sciences, and thank E.V. Podivilov for fruitful discussions.