There is interest in using spatial modes of light to increase the data speed of free-space optical communication where, each spatial mode can be used as a state or channel with which to encode or carry data, respectively. Here, the use of Hermite-Gaussian modes for free-space optical communication is investigated. It is shown that due their symmetry with respect to lateral displacement, as compared to other spatial modes, such as, orbital angular momentum modes, a subset of Hermite-Gaussian modes can experience less mode-crosstalk and -dependent loss when laterally displaced at the data receiver.
Giovanni Milione, Bienvenu Ndagano, Nokwazi Mphuthi, and Andrew Forbes, "Using Hermite-Gaussian modes for free-space optical communication (Conference Presentation)," Proc. SPIE 10549, Complex Light and Optical Forces XII, 105490C (Presented at SPIE OPTO: January 30, 2018; Published: 14 March 2018); https://doi.org/10.1117/12.2292578.5751542128001.
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