Ultrawide shifting of the laser pulse wavelength in a multicore tellurite fiber with two zero-dispersion wavelengths

Abstract

The generation of Raman solitons in the mid-IR range in a multicore fiber with two zero-dispersion wavelengths is studied analytically and numerically. The estimate for the maximum shift of the Raman soliton wavelength depending on the parameters of the media dispersion, the frequency-dependent losses, and the nonlinearity decreasing is obtained, which is in good agreement with the results of numerical simulation. A realistic design of a 10-core fiber made of a pair of compatible glasses is proposed for the Raman shift of the wavelength of soliton pulses propagating in an out-of-phase mode. The nonlinear dynamics of a laser pulse, specified at the wavelength of $2.3\phantom{\rule{4pt}{0ex}}\ensuremath{\mu}\mathrm{m}$, energy of 1.5 nJ, and duration of 100 fs, during propagation in a fiber with this design, is studied numerically. The generation of Raman solitons in the mid-IR range at wavelengths exceeding $4\phantom{\rule{4pt}{0ex}}\ensuremath{\mu}\mathrm{m}$, as well as dispersion waves in the $5\text{\ensuremath{-}}\ensuremath{\mu}\mathrm{m}$ range, emitted by a soliton when approaching the second zero-dispersion wavelength, is demonstrated.