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Stacked modulation formats enabling highest-sensitivity optical free-space links

Ludwig, A.; Schulz, M.L.; Schindler, P.; Wolf, S.; Koos, C.; Freude, W.; Leuthold, J.

Abstract:
A new modulation scheme with a sensitivity of 2.3 photons per bit at a bit-error ratio (BER) of 10-3 is discussed theoretically and demonstrated experimentally. We achieve a limiting sensitivity of 2.3 photons per bit (3.7 dB photons per bit) by stacking the modulation formats 64PPM, 4FSK and polarization-switched (PS) QPSK. This modulation stack encodes 11 bit per symbol (PPM: 6 bit, FSK: 2 bit, PS-PQSK: 3 bit). We also replaced 4FSK by 2ODFM (2-channel multiplex) for comparison. With 64PPM-2OFDM-PS-QPSK a total of 12 bit are encoded (PPM: 6 bit, 2 OFDM channels with PS-QPSK: 2 x 3 bit). Both modulation stacks show a similar limiting sensitivity and are probably the highest sensitivities so far reported for a BER of 10-3, Our theoretical considerations are supported by simulations and experiments.

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Volltext §
DOI: 10.5445/IR/1000049752
Originalveröffentlichung
DOI: 10.1364/OE.23.021942
Scopus
Zitationen: 9
Web of Science
Zitationen: 6
Coverbild
Zugehörige Institution(en) am KIT Institut für Photonik und Quantenelektronik (IPQ)
Publikationstyp Zeitschriftenaufsatz
Jahr 2015
Sprache Englisch
Identifikator ISSN: 1094-4087
urn:nbn:de:swb:90-497529
KITopen-ID: 1000049752
Erschienen in Optics express
Band 23
Heft 17
Seiten 21942-21957
Bemerkung zur Veröffentlichung Gefördert durch den KIT-Publikationsfonds
Nachgewiesen in Scopus
Web of Science
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