Abstract. This study presents a detailed theoretical analysis of chiral fibers, focusing on their unique helical core structure and its implications for mode coupling. Chiral fibers are distinguished by their twisted cores, which follow a helical path inside the cladding. The research applies mode-coupling theory under weak guidance to analyze the interactions between linearly polarizedContinua a leggere "Design and Mathematical Analysis of Chiral Optical Fibers for Generating Spin and Orbital Angular Momentum"