Axisymmetric fibres support linearly and circularly polarised sech pul
ses and also elliptically polarised pulses having more complicated pro
file. Collisions between any two such pulses are studied numerically.
Large collision speed causes little radiation, but appreciable pulse e
llipticity changes. Smaller relative speed gives imperfect collision f
or nearly-orthogonal, linearly polarised pulses. Critical parameter ra
nges yield pulse annihilation, but small ellipticity adjustment restor
es two emergent pulses.