Abstract
ABSTRACT The nonlinearity in optical fibres can be enhanced significantly by reducing the effective mode area or by using materials with higher nonlinear-index coefficient (n 2 ). In this paper we combine these two concepts and experimentally demonstrate enhanced Kerr nonlinear effects in tapered highly nonlinear As 2 Se 3 chalcogenide fibre. We taper the fibre to sub-wavelength waist diameter of 1.2 µm and observe enhanced nonlinearity of 63,600 W -1 km . This is 40,000 times larger than in silica single-mode fibre, owing to the 400 times larger n 2 and almost 100 times smaller effective mode area. We also discuss the role of group velocity dispersion in these highly nonlinear fibre tapers. Keywords: Chalcogenide, Kerr nonlinearity, nonlinear, fibre taper, nanowire. 1. INTRODUCTION Highly nonlinear optical waveguides are of gr eat importance for the realization of compact and low-power nonlinear all-optical devices. Of particular importance are optical waveguides with strong $ (3)
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