Stress Effects on Crosstalk and Skew in Bent Multicore Fibers: A Revisit to Effective Bending Radius

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Abstract
The so-called effective bending radius (EBR) for a stress-effect correction is required in order to fit calculated bend losses in single-core fibers with measured results; however, the EBR has been hardly used for evaluating the stress effects on the inter-core crosstalk (XT) and inter-core skew (ICS) in bent multicore fibers (MCFs). In this paper, first, revisiting and comprehensively reviewing the EBR derivation method, we confirm that there exist two different EBR values, ${{R}_{\mathrm{eff}}} \approx $1.28$R$ and ${{R}_{\mathrm{eff}}} \approx $1.4$R$ with $R$ being the bending radius, depending on the underlying assumptions. Next, incorporating the EBR into the XT and ICS formulae, we evaluate the stress effects on the XT and ICS in bent MCFs, and reveal that the EBR ${{R}_{\mathrm{eff}}}$= 1.4$R$ leads to more consistent results between calculations and measurements.

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