Tailoring the Nonlinear Response of Hollow-core Photonic Bandgap Fibres

Abstract

Abstract. We have fabricated 7-cell and 3-cell core hollow-core photonic bandgap fibres with core sizes ranging from ~ 16.7 |im to 6.5 |im. A numerical study of the nonlinear coefficient of fibres with different core sizes is carried out. We show that the nonlinearity is more effectively increased by a 3-cell core design than by reducing the size of a seven-cell core.

Dispersion of the nonlinear refractive index in photonic bandgap waveguides

“…This strong wavelength dependence cannot be attributed to the bulk fused silica reference sample, which has an essentially flat dependence of n 2 in this wavelength range. A similar spectral dependence has, however, been observed near the bandgap in simulations of the contribution of air to the overall nonlinear refractive index of a HC-PCF [3], which might indicate that in the HC-1550-01 fiber the air contribution dominates over the contribution of fused silica.…”

Applicability of low macrobending loss hollow-core PCF to FTTH applications

“…The photonic crystal cladding of this thin core wall fiber has a pitch Λ = 6.7 µm and an air filling fraction of ~ 96%, giving rise to a photonic bandgap centered approximately at 1550 nm [22]. Furthermore, this fiber has a very low nonlinear coefficient than conventional solid fibers,approximately three orders of magnitude less [23], due the nonlinearity index of air is lower than silica or doped silica. This low nonlinearity combined with low dispersion makes it ideal fiber to deliver and manipulate ultra-short pulses [24,25] or optics sensorial applications [26].…”