A Simplified Model for Linear Mode Coupling in Multimode Fibers with Experimental Assessment

This paper presents a novel surrogate model for linear coupling in graded-index multimode fibers. The model offers computational efficiency improvements over existing approaches and can be calibrated through a single measurable parameter. Performance validation was conducted through both numerical simulations and experiments using a 90-polarization-mode fiber, demonstrating the model's practical applicability in fiber optics and photonics applications.