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Modeling of fused-fiber coupler cross-section as a function of fusion degree

The fusion process of the fused-fiber couplers is considered as the motion of an incompressible Newtonian fluid, which is driven by a constant surface tension acting at the free boundary. The internal velocity field is obtained using conformal mapping methods introduced by Hopper and Richardson. Markers are then used, to determine the layers' shape evolution. Theoretical results are compared to experimental observations.