Hole-assisted fibers (HAFs) in a fiber ribbon have been studied for high-speed parallel transmission systems. This paper describes the influence of hole-structure variations on the group delay variation caused by stress, the mode field diameter (MFD), and the higher order mode characteristics. Calculations are made using the previously proposed calculation method with finite element method (FEM). We discuss the effectiveness and limitation of the previously proposed parameter S * W, based on the calculations.
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