Formation of Pure Quartic Soliton in Single Crystal Microstructured Optical Fiber

We propose a single crystal photonic crystal fiber (SC-PCF) as an efficient waveguide to form quartic soliton for the first time. We design an SC-PCF that meets the real life fabrication tolerances presenting negative fourth order dispersion of about −0.0028 ps4km−1 at 2350 nm wavelength. The fiber also exhibits second order dispersion of about 0.5 ps2km
$^{- 1}$
and negligible third order dispersion at the same wavelength which are the criteria to form quartic soliton. Finally, the designed SC-PCF presents pure quartic soliton (PQS) formation for 0.1 ps input pulse with 0.0275 W peak power at 2375 nm. Moreover, we investigate the impact of third order dispersion on PQS. Nonlinear Schrödinger equation is solved using split step Fourier method for numerical analysis. To the best of our knowing, single crystal fibers are yet to be proposed for pure quartic soliton formation which have potentiality for ultrafast laser applications.