Interactions of the second-order solitons with an external probe pulse in the optical event horizon

Abstract

We demonstrate manipulating the interactions of a second-order soliton with a weak probe pulse under the condition of group velocity match and group velocity mismatch (GVMM). During these interactions, the second-order soliton acting as an effective periodic refractive-index barrier leads to the polychromatic scattering of the probe pulse, which is represented as unequally spaced narrow-band sources with adjustable spectral width. In the case of GVMM, almost all the spectral components of the narrow-band sources meet the nonlinear frequency conversion relationship by using the wavenumbermatching relationship due to the robustness of the second-order soliton under moderate high-order-dispersion perturbations, so this case is more conducive to the study of the soliton wells. In addition, different transmission states of a soliton well are demonstrated under different probe pulse properties in the fiber-optical analog of the event horizon. When the power of the probe pulse is strong enough, a dispersive wave can be generated from the collision of two fundamental solitons split from the two second-order solitons. These interesting phenomena investigated in this work as a combination of white-and black-hole horizons can be considered as promising candidates for frequency conversion and broadband supercontinuum generation.

Controllable wavelength conversion based on soliton dynamics in mid-infrared fiber

“…At the same time, there is a significant research effort focused on extending the wavelength coverage toward the mid-Infrared (mid-IR) in the 2-20 µm molecular fingerprint region currently [15][16][17][18][19][20]. But the generation of these mid-infrared supercontinua requires a 2-5 µm ultrasoft pulse source, and the current methods of implementation are optical parametric oscillators (OPO) and amplifiers (OPA) [2].…”

Slotless dispersion-flattened waveguides with more than five zero-dispersion wavelengths

“…Thus, the generation of broadband and flat dispersion profiles in integrated waveguides, also known as dispersion flattening, has attracted much interest from researchers in recent years. Dispersion flattening can enhance nonlinear processes and has been widely used for supercontinuum generation [2][3][4][5][6][7] , frequency comb generation [8][9][10] , parametric amplification [11] , and ultrafast pulse manipulation [12] .…”

“…The removal of the slot-assisted structure simplifies the waveguide parameters from four to three and makes material selection more flexible. The bilayer waveguide structure has been used in various nonlinear applications [6,[9][10][11][12][22][23][24] . Although the bilayer waveguide makes fabrication easier, the flatness of the dispersion profile is rarely improved.…”