LP01-LPn intermodal interference in highly birefringent two-mode fibres with differential LPU polarization-mode attenuation

摘要

Starting from the experimental observation and the theoretical prediction that different types of highly birefringent (Hi-Bi) fibres suppress different LPU polarization modes, a generalized theoretical analysis of. LPoi-LPu intermodal interference in Hi-Bi bimodal optical fibres is pre-sented. Differential attenuation for each of the four LP polarization modes is assumed and, on this basis, spatial Stokes parameters accounting for intermodal interference effects are derived. The most important particular cases of elliptical-core, bow-tie and PANDA-type fibres are considered. The appli-cation to combined polarimetric and polarization sensitive intermodal sensors, as well as to simultaneous multiparameter sensing in Hi-Bi fibres is commented upon.