Theoretical Investigation of Six-Mode Multi/Demultiplexer Based on Fused-Type Multicore Fiber Coupler

摘要

A six-mode (LP01/LP11ab/LP21ab/LP02) multi/demultiplexer based on a fusedtype multicore fiber coupler is proposed, and the coupling characteristics are investigated. The multi/demultiplex operation is achieved by a phase matching between the desired mode of center core and the LP01 mode of the outer core in the elongated region of the fused-type multicore fiber coupler. From the numerical results based on the beam propagation method, it is found that the coupling efficiencies between the LP01 and LP11/LP21/LP02 modes are more than -0.1 dB, and the crosstalk is lower than -20 dB at the wavelength of 1550 nm.