Topic
Multi-mode optical fiber
About: Multi-mode optical fiber is a research topic. Over the lifetime, 17949 publications have been published within this topic receiving 238868 citations.
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TL;DR: In this article, the authors investigated the relationship between loss, coupling, and delay differences among the modes of multimode fibers and provided a comprehensive description of the interrelations between them.
Abstract: Loss, coupling, and delay differences among the modes of multimode fibers influence their transmission characteristic in a complicated way An approximation of the modes by a continuum leads to a comprehensive description of these interrelations We relate the mode power distribution to the far-field output and calculate these distributions as functions of the fiber length and the input We report measurements of the far-field distributions at various lengths of a cladded low-loss multimode fiber A comparison of theory and experiment yields a quantitative estimate of the mode coupling involved We associate this coupling with random irregularities of the fiber configuration and straightness, and construct a quantitative model of such irregularities
433 citations
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TL;DR: In this article, the authors show that the Kerr effect in a graded-index (GRIN) MMF is the driving mechanism that overcomes speckle distortions, and leads to a counterintuitive effect that results in a spatially clean output beam robust against fibre bending.
Abstract: The Kerr effect in graded-index multimode fibres drives a spatial beam self-cleaning phenomenon that withstands fibre bending and does not necessitate dissipative processes such as stimulated scattering. Multimode optical fibres are enjoying renewed attention, boosted by the urgent need to overcome the current capacity crunch of single-mode fibre (SMF) systems and by recent advances in multimode complex nonlinear optics1,2,3,4,5,6,7,8,9,10,11,12,13. In this work, we demonstrate that standard multimode fibres (MMFs) can be used as ultrafast all-optical tools for the transverse beam manipulation of high-power laser pulses. Our experimental data show that the Kerr effect in a graded-index (GRIN) MMF is the driving mechanism that overcomes speckle distortions, and leads to a counterintuitive effect that results in a spatially clean output beam robust against fibre bending. Our observations demonstrate that nonlinear beam reshaping into the fundamental mode of a MMF can be achieved even in the absence of a dissipative process such as stimulated scattering (Raman or Brillouin)14,15.
390 citations
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TL;DR: It is demonstrated for the first time to the authors' knowledge a digital phase conjugation technique for generating a sharp focus point at the end of a multimode optical fiber.
Abstract: We demonstrate for the first time to our knowledge a digital phase conjugation technique for generating a sharp focus point at the end of a multimode optical fiber. A sharp focus with a contrast of 1800 is experimentally obtained at the tip of a 105μm core multimode fiber. Scanning of the focal point is also demonstrated by digital means. Effects from illumination and fiber bending are addressed.
389 citations