Confinement loss in highly nonlinear holey optical fibres

In conclusion, we have applied the multipole approach to holey optical fibres with cladding features of the order of the wavelength of light guided in the structure. By applying this method to real structures, we find that it is a useful tool for predicting the magnitude of the confinement loss in single-material fibres, a loss mechanism that has been found to be particularly significant for small-core fibres.