Burns W K, Abebe M
Appl Opt. 1987 Oct 1;26(19):4190-2. doi: 10.1364/AO.26.004190.
An analytic coupling model for fused fiber couplers is obtained assuming a parabolic taper shape for the fibers. The model is compared to experimental results for several fused fiber couplers. Both pull length and final fiber diameter can be predicted for 3-dB couplers.