Nonlinear effects generation in non-adiabatically tapered fibres

•First demonstration of nonlinear generation using non-adiabatically tapered fibres.•Nonlinear effects observed in a centimetre of propagation.•Solution compatible with wavelength-division networks.•Very low fabrication cost.

Nonlinear effects are observed in a non-adiabatically tapered optical fibre. The designed structure allows for the introduction of self-phase modulation, which is observed through pulse breaking and spectral broadening, in approximately a centimetre of propagation using a commercial telecom laser. These devices are simple to fabricate and suitable to generate and control a variety of nonlinear effects in practical applications because they do not experience short-term degradation as previously reported approaches. Experimental and theoretical results are obtained, showing a good agreement.