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Stacking PS-QPSK and 64PPM for Long-Range Free-Space Transmission

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Abstract

In this paper a new sensitivity record for uncoded transmission with 2.6 photons per bit (4.15 dB) is presented. This is achieved using four dimensional (4-D) stacked orthogonal modulation formats i.e. PS-QPSK-64PPM.

© 2013 Optical Society of America

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