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We demonstrate high fidelity conversion of a polarization-entangled photon pair into a hybrid OAM-polarization entangled pair by using a special multi-mode vortex fiber. A new model accounting for frequency-dependent modal loss fits the data.
Orbital angular momentum states offer a potential path to mode division multiplexing in optical fiber. We review progress on a new class of fibers that support stable propagation of these states.
We demonstrate muxing, transmission and demuxing of 2 OAM beams over 10 wavelength channels through 1.1-km of vortex fiber. An aggregated total capacity of 1.6-Tbit/s is achieved by using 20-Gbaud/s 16-QAM signal on each channel.
We demonstrate the first proof of concept of a fiber-based STED nanoscopy illumination system. The fiber yields naturally co-aligned vortex (dark-spot size∼198nm) and Gaussian beams (size∼340nm), potentially enabling sub-30nm resolution imaging.
Optical vortices, which carry orbital angular momentum, form infinite-dimensional basis sets of orthogonal states, which make them attractive for mode-division multiplexing systems. We describe recent demonstrations of successfully generating & propagating vortices in optical fibres, and review recent transmission experiments conducted with them.
HiLo microscopy is a widefield fluorescence imaging technique that provides depth discrimination by combining two images, one with non-uniform illumination and one with uniform illumination. We discuss the theory of this technique and a variety of practical implementations in brain-tissue imaging and fluorescence endomicroscopy.
The dramatic proliferation of visual displays, from cell phones, through video iPods, PDAs, and notebooks, to high-quality HDTV screens, has raised the demand for a video compression scheme capable of decoding a "once-encoded" video at a range of supported video resolutions and with high quality. A promising solution to this problem has been recently proposed in the form of wavelet video...
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