Theoretical Analysis of the Transmission Efficiency of a (6 + 1) × 1 Pump–Signal Combiner

An analytical formulation for the transmission efficiency of a(6+1)× 1 pump-signal combiner has been developed and is reported in this paper. The formulation is supported by the Coupled Mode Theory (CMT), and the Finite Difference Beam Propagation Method (FD-BPM). In this scope, the characteristics of commercial fibers FG200AEA, GDF20/200, P-20/400DC are considered to build a combiner computational model. Thus, the CMT was used to estimate the adiabatic length of the input bundle fibers and the combiner efficiency was analyzed based on FD-BPM.