A dispersion engineered silica-based photonic crystal fiber for supercontinuum generation in near-infrared wavelength region.

• Computational model of photonic crystal fibers in silica glass for near-infrared supercontinuum generation has been proposed. • At pump wavelength of 1300 nm, a flat-top dispersion profile has been obtained with very low dispersion value in anomalous region. • An ultra-broadband supercontinuum spanning, from 0.67 μm up to 2.4 μm can be easily achieved by proposed fiber of 37 cm length in near-infrared wavelength region. We report computational modeling of photonic crystal fibers in silica glass for near-infrared supercontinuum generation. Optical parameters like chromatic dispersion, nonlinearity and the effective area of the fundamental mode have been computed and tailored by using a full vectorial finite element method. At pump wavelength of 1300 nm, a flat-top dispersion profile has been obtained with very low dispersion value + 0.6402 ps/nm/km in the anomalous region. The reported structure offers high nonlinear coefficient 26.27W−1. km−1with effective mode area 4.78 μm2 at the pump wavelength. An ultra-broadband supercontinuum spanning, from 0.67 μm up to 2.4 μm can be easily achieved by the proposed fiber of 37 cm length using a 63 fs secant laser pulse source with 8 kW peak power in the near-infrared wavelength region. Such type of fiber can be advantageous in the field of near-infrared spectroscopy, optical communication, gas sensing, medical, frequency metrology, optical coherence tomography, and food quality control. [ABSTRACT FROM AUTHOR]