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

A. Ludwig, M. L. Schulz, P. C. Schindler, R. Schmogrow, A. Mustafa, B. Moos, S. Brunsch, T. Dippon, D. Malsam, D. Hillerkuss, F. Roos, W. Freude, C. Koos, and J. Leuthold
NW2C.2 Photonic Networks and Devices (Networks) 2013

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S. Chandrasekhar, Xiang Liu, T. H. Wood, and R. W. Tkach
OW3H.6 Optical Fiber Communication Conference (OFC) 2012

Demonstration of Record Sensitivity in an Optically Pre-amplified Receiver by Combining PDM-QPSK and 16-PPM with Pilot-Assisted Digital Coherent Detection

Xiang Liu, T. H. Wood, R. W. Tkach, and S. Chandrasekhar
PDPB1 Optical Fiber Communication Conference (OFC) 2011