Phys.org March 14, 2019
Multiplexing multiple orbital angular momentum (OAM) channels enables high-capacity optical communication but decreases the orthogonality between OAM channels for demultiplexing and eventually increases crosstalk in communication. To overcome this an international team of researchers (China, USA – Caltech, Howard Hughes Medical Institute, the Netherlands, France) developed scattering-matrix-assisted retrieval technique (SMART) to demultiplex OAM channels from highly scattered optical fields and achieve an experimental crosstalk of –13.8 dB in the parallel sorting of 24 OAM channels after passing through a scattering medium. They demonstrated high-fidelity transmission of images under scattering conditions at an error rate of <0.08%. using the technique. This technique might open the door to high-performance optical communication in turbulent environments…read more. Open Access TECHNICAL ARTICLE
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The concept of SMART-enabled OAM-multiplexed transmission across scattering channels. Credit: Light: Science & Applications, doi: https://doi.org/10.1038/s41377-019-0140-3.