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Stacking Modulation Formats for Highest-Sensitivity

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Abstract

A scheme with a sensitivity of 2.3 photons per bit (SNRbit = 3.7dB) is demonstrated. This is achieved by stacking the modulation formats 64PPM, 4FSK, PS-QPSK. An improvement of ~0.5 dB over 64PPM-PS-QPSK is achieved.

© 2014 Optical Society of America

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

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