Novel Eight-Core Double-Trench Fiber Displaying Low Loss and Supporting Five Linearly Polarized Modes

Abstract

A novel eight-core double-trench fiber that supports five linearly polarized modes is proposed. The characteristics of the designed fiber are analyzed systematically using the finite element method. A step-pure silicon core and a ring refractive index trench are employed to effectively reduce loss. Furthermore, an internal trench is used to reduce dispersion and the differential mode group delay. The nonlinear coefficient and crosstalk are also reduced effectively by adjusting the fiber geometric parameters and material refractive index. The designed eight-core fiber has potential applications in high-capacity and high-quality fiber communication by mode division multiplexing.