5. Conclusions

Finally, it can be concluded that the solitons generated in the nonlinear process of pulse breakup for the special case when the twisted standard fiber is used can present a high degree of polarization for the case when the polarization of the input pulse is circular. The numerical calculations agree with the experimental results show that the polarization ellipticity of solitons tends to be greater than the polarization of the input pulse (for the case when the polarization of the input pulse is circular). We can say that according to the results, this effect does not depend on the circular birefringence, so, in this particular case, the twisted fiber plays a role of the ideal fiber without birefringence.

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