Polarisation-independent switching in a nonlinear optical loop mirror by a dual-wavelength switching pulse

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Abstract
Polarisation-independent all-optical switching has been demonstrated in a nonlinear optical loop mirror using a switching pulse comprising two waves of orthogonal polarisation and a few nanometre wavelength separation. Neither a polarisation-maintaining loop fibre nor polarisation adjustment of the switching pulse was required in the loop mirror to achieve polarisation-independent switching.