Bending-induced inter-core group delays in multicore fibers

Abstract : We examine the impact of fiber bends on ultrashort pulse propagation in a 169-core multicore fiber (MCF) by numerical simulations and experimental measurements. We show that an L-shaped bend (where only one end of the MCF is fixed) induces significant changes in group delays that are a function of core position but linear along the bending axis with a slope directly proportional to the bending angle. For U-and S-shaped bends (where both ends of the MCF are fixed) the induced refractive index and group delay changes are much smaller than the residual, intrinsic inter-core group delay differences of the unbent MCF. We further show that when used for point-scanning lensless endoscopy with ultrashort pulse excitation, bend-induced group delays in the MCF degrade the point-spread function due to spatiotemporal coupling. Our results show that bend-induced effects in MCFs can be parametrized with only two parameters: the angle of the bend axis and the amplitude of the bend. This remains valid for bend amplitudes up to at least 200 degrees.
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Viktor Tsvirkun, Siddharth Sivankutty, Géraud Bouwmans, Olivier Vanvincq, Esben Ravn Andresen, et al.. Bending-induced inter-core group delays in multicore fibers. Optics Express, Optical Society of America, 2017, 25 (25), pp.203901 - 31863. ⟨10.1364/OE.25.031863⟩. ⟨hal-01661281⟩

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