Coherent optical MIMO (COMIMO)

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Transmission at 2×100Gb/s, over two modes of 40km-long prototype few-mode fiber, using LCOS-based mode multiplexer and demultiplexer (2011, methodology): “Multiple-input multiple output (MIMO) algorithms have already bee n used in a coherent receiver [3] in a transmission over a shor t multi-mode fiber (MMF), with simple single-mode f iber (SMF)to-MMF couplers as mode selectors.”
Mode-Division Multiplexing Over 96 km of Few-Mode Fiber Using Coherent 6 $\,\times\,$6 MIMO Processing (2012, result): “In contrast to earlier MIMO experiments conducted over multimode fiber (MMF)[7], [8], [12], the complete set of waveguide modes supported by the MMF is launched and coherently detected.”
Fifty Years of MIMO Detection: The Road to Large-Scale MIMOs (2015, background): “For more details on MIMO aided high-speed optical communications, please refer to [651]–[657].”
Modes and states in quantum optics (2019, background): “Note that extracting physically reliable and useful information from the measurement of the noise amplitudes and correlations in a complex physical system by extracting a finite number of ”principal modes” from noise matrices is a well-known procedure in other parts of science and technology (Shah e”