Abstract
It is demonstrated by numerical simulations that the CS2-filled dual-core fiber coupler with appropriate parameters can provide single-mode operation, normal dispersions, low loss and high nonlinearities in 1550-nm and 2000-nm wavelength windows, which can contribute to a saturable absorber (SA) with short fiber length and low power needed for nonlinearity-induced saturation. The effects of stimulated Raman scattering (SRS) play a key role in the process of nonlinearity-induced saturation. The numerical results indicate that the SAs can be employed in the mode-locking fiber lasers with self-similar (SS) or dissipative soliton (DS) operations.
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