An optical phase conjugator is used to enhance transmission stability ofpolarization solitons in highly birefringent fibres. Two polarizationsolitons form a breather in fibres with low birefringence firstly andthe optical phase conjugator is used to make the spectra of polarizationsolitons converse, which results in the fact that the polarizationsoliton along the fast axis is compressed due to the strengthened self-phasemodulation effect. Two polarization solitons are compressed further dueto the cross-phase modulation effect. The enhanced nonlinear effectsmake the central peak frequencies of two polarization solitons shift tothe larger range in opposite directions so that they trap each otherfully to suppress the effect of birefringence.