Abstract
We study soliton solutions of the nonlinear equation governing pulse propagation in semiconductor-doped glass (SDG) fibres which have saturation-type nonlinearity. The phase modulation of the pulse is nonlinear and no sech-type soliton exists in SDG fibres when high-order correction terms are taken into account. As compared with optical solitons in ordinary glass fibres, the property of the solitons discussed here is somewhat different.