Semi-Analytical Modelling of Linear Mode Coupling in Few-Mode Fibers

This paper reviews and extends a method for the semi-analytical solution of the coupled linear differential equations that describe the linear mode coupling arising in fewmode fibers due to waveguide imperfections.The semi-analytical solutions obtained proved to be accurate when compared to numerical solution methods.These solutions were integrated into a multi-section model with split-steps for mode dispersion and mode coupling.Simulations using this model matched the analytical predictions for the statistics of group-delays in fewmode fiber links, considering different coupling regimes with and without mode delay management.