Soliton spectral tunneling effect in multi-cladding single mode fibers with three zero-dispersion wavelengths

We present the numerical simulations of soliton spectral tunneling (SST) effect in multi-cladding single mode fibers with three zero-dispersion wavelengths. Fiber geometries with appropriate refractive index difference and fiber radius are selected to generate this unique dispersion property. The mechanism of multi-cladding fibers exhibiting multi zero-dispersion wavelengths is discussed. Simulation results clearly show SST effect in the proposed multi-cladding fiber. The dependence of the output SST frequency on fiber geometry is investigated numerically and analytically. The detailed studies present the phase-matching condition of dispersive pulses in different engineered dispersion curves of multi-cladding fibers. The soliton numbers of input pulse show a significant role on the threshold length of SST effect.