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A technique developed at the University of Rochester “flips” the optical wavefront of an image for both polarizations simultaneously, so that it can be transmitted through a multimode fiber without distortion. The research overcomes a barrier to the use of multimode fibers to boost the informational capacity of the internet caused by a phenomenon called modal crosstalk.
When a well-defined image propagates from the right-hand side to the left-hand side through a 1-km-long multimode fiber, its spatial profile and polarization will be strongly distorted. By flipping the wavefront of the distorted image for both polarizations simultaneously, a technique referred to as vectorial time reversal, an undistorted beam is formed…READ MORE