1480 nm two-cascaded highly efficient Raman fiber laser

Bi-doped fiber lasers

“…The lasing wavelength λ s was defined by the FBGs resonance wavelength. As pump sources a Raman fiber laser (λ p = 1230 nm [60]), or a BFL based on an ASB-fiber and emitting at λ p = 1205 nm [40] was used in a set of similar experiments. As the BFL active medium we used a 30-m long PGSB or GSB fiber with λ p = 1230 nm and λ p = 1205 nm.…”

Numerical calculation of the linewidth of Raman fiber lasers due to spontaneous Raman scattering

“…(18). In order to be allowed to give an explicit expression for S + ( , 0), we show that L( )R( )G 2 = 1: If L( ) = 0, the statement is clear.…”

“…Finally, it has been shown that line broadening can significantly stabilize multi-wavelength Raman fiber lasers [16]. The line broadening is usually attributed to nonlinear effects such as four-wave mixing (FWM) or Brillouin scattering [12][13][14]17,18] and there have been several attempts at theoretically calculating the output spectrum of RFLs using various approximations [19][20][21][22][23]. However, a rigorous theoretical treatment of the spectrum of a linear-cavity RFL taking into account FWM without questionable unphysical assumptions has not yet been published.…”

Nonlinear fibre-optic devices pumped by semiconductor disk lasers

“…The two-stage amplification was demonstrated in phosphate fibre (1.06 mm ® 1.24 mm ® 1.48 mm) with the overall conversion efficiency of 40 % [56]. For a silica fibre the two-stage amplification (1.06 mm ® 1.23 mm ® 1.3 mm), the efficiency was in the range of 46 % [57].…”