Analysis of the Supermode of Multicore Photonic Crystal Fibers Based on the Finite Element Method

Based on the Helmholtz equation, the full-vector finite element method, accompanied by the shifted iteration algorithm, were used for analyzing in-phase supermode of the linear-core multicore photonic crystal fiber, and the influences of fiber structural parameters on in-phase supermode field were also studied. The results indicate that the desired mode shaping with the same amplitude in each core can be obtained by choosing appropriate the diameter of air hole. The results show a viable option for further achieving high-power laser output.