Generation of supercontinuum in a nonlinear fiber light guide. Controlling the Raman soliton wavelength by controlling the polarization state of the pump pulse

The problem of generating ultrashort Raman solitons with a wavelength in the range of 1600 – 1700 nm, which are formed in a nonlinear fiber when splitting a high-power pump pulse with a wavelength of ∼1550 nm, is considered numerically and experimentally. The specificity of the problem is the use of a photonic crystal fiber with a large mode area and close to zero birefringence as a nonlinear light guide. The results obtained show the possibility of controlling the central wavelength of a Raman soliton in the range of 1625 – 1700 nm by controlling the polarization state of the pump pulse at the input to the photonic crystal fiber. The proposed method for controlling the wavelength is notable in that the energy of the Raman soliton remains approximately the same throughout the entire tuning range, which is very attractive for a number of applications.