Proceedings Article | 26 October 2011
Proc. SPIE. 8011, 22nd Congress of the International Commission for Optics: Light for the Development of the World
KEYWORDS: Ultrafast phenomena, Refractive index, Photonic crystal fibers, Data modeling, Cladding, Dispersion, Manufacturing, Structured optical fibers, Supercontinuum generation, Picosecond phenomena
In the modeling of supercontinuum generation in photonic crystal fibers by ultrashort pulses, the knowledge of the
higher-order dispersion terms of the fiber are necessary to achieve a good approximation between the simulated and
experimental spectra. However, these parameters are usually not provided by the manufacturer. In this work, we present
the numerical estimation of the higher-order dispersion terms for a nonlinear photonic crystal fiber with hexagonal holes.
For the simulation, we chose a commercial fiber with a high nonlinear response (Blazephotonics NL-2.4-8). The fiber
was designed with a small core diameter of 2.4 μm and a triangular pattern of air holes in the cladding with a pitch of
2.9 μm. Through the free software, MIT Photonic Bands, the structure of the fiber was modeled and the effective
refractive index, as well as the dispersion terms curves are estimated. From our results, the zero-dispersion wavelength of
the fiber resulted to be of 800 nm and at this wavelength, the higher-order dispersion terms were: β2=0, β3=0.05 ps3/km,
β4=-7.03×10-5 ps4/km, β5=1.4×10-7 ps5/km, β6=-4.163×10-10 ps6/km, β7=1.118×10-12 ps7/km. The zero-dispersion
wavelength and the dispersion slope estimated at this wavelength agree with the values reported by the manufacturer.
