Multiwavelength fiber laser sources with 60 GHz Brillouin frequency shift

The experimental results obtained for the sextuple Brillouin Stokes line (0.48 nm) based on stimulated Brillouin scattering phenomenon are presented in this paper. Three ring laser cavities with unidirectional propagation are used. In each ring cavity, a dispersion compensation fibre (DCF) spool is used as a Brillouin gain medium. Two erbium amplifiers are used to amplify the generated Stokes signal and to overcome the path loss for the propagation Stokes lines. A maximum pump power of 500 mW at a central wavelength of 1480 nm is used for these two amplifiers. In our new structure, up to three sextuple Stokes lines with a high signal power of 10 dBm and a large optical signal-to-noise ratio of more than 55 dB are achieved. The generated Stokes lines can be tuned over a wavelength range of 15 nm from 1560 to 1575 nm.