Different methods of obtaining high birefringence in optical fibres are analysed, especially for elliptical core fibre,PANDA type and bow tie fibre. New analytical method of boundary elements /BEM/ has been adopted for strenght component calculation and accuracy of 0,05% in comparision with cylindrical fibre calculation has been obtained. Fibre with elliptical core and elliptical inclusions has been analysed. Three experimental methods for state of polari-zation /SOP/ in the fibre have been developed namely compensation, dynamical and external magnetic field method. Obtained experimental results for different types of fibres are displayed.
V. Sochor, V. Sochor,
"Recent Advances In Optical Fibres: Development Of Special Fibres", Proc. SPIE 1033, Trends in Quantum Electronics, (18 May 1989); doi: 10.1117/12.950646; https://doi.org/10.1117/12.950646