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 $2.3\mu \mathrm{m}$, 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 $4\mu \mathrm{m}$, as well as dispersion waves in the $5\text{−}\mu \mathrm{m}$ range, emitted by a soliton when approaching the second zero-dispersion wavelength, is demonstrated.

中文翻译：

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具有两个零色散波长的多芯碲酸盐光纤中激光脉冲波长的超宽偏移

分析和数值研究了在具有两个零色散波长的多芯光纤中中红外范围内拉曼孤子的产生。获得了依赖于介质色散、频率相关损耗和非线性递减参数的拉曼孤子波长最大位移的估计，这与数值模拟结果非常吻合。提出了一种由一副兼容玻璃制成的 10 芯光纤的现实设计，用于以异相模式传播的孤子脉冲波长的拉曼位移。激光脉冲的非线性动力学，在波长为$2.3\mu \mathrm{米}$在采用这种设计的光纤中传播期间，1.5 nJ 的能量和 100 fs 的持续时间进行了数值研究。中红外范围内波长超过的拉曼孤子的产生$4\mu \mathrm{米}$，以及散射波 $5\text{-}\mu \mathrm{米}$ 演示了孤子在接近第二个零色散波长时发射的范围。