Sensitivity Gains by Mismatched Probabilistic Shaping for Optical Communication Systems

Sensitivity Gains by Mismatched Probabilistic Shaping for Optical Communication Systems

Probabilistic shaping of quadrature amplitude modulation (QAM) is used to enhance the sensitivity of an optical communication system. Sensitivity gains of 0.43 and 0.8 dB are demonstrated in back-to-back experiments by the shaping of 16QAM and 64QAM, respectively. Furthermore, numerical simulations...

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Veröffentlicht in:IEEE photonics technology letters 2016-04, Vol.28 (7), p.786-789
Hauptverfasser: Fehenberger, Tobias, Lavery, Domanic, Maher, Robert, Alvarado, Alex, Bayvel, Polina, Hanik, Norbert
Format: Artikel
Sprache:eng
Schlagworte:
Achievable Information Rates
AWGN channels
Channels
Constellations
Digital Coherent Transceivers
Digital Signal Processing
Gain
Mutual Information
Optical communication
Probabilistic logic
Probabilistic methods
Probabilistic Shaping
Probability theory
Quadrature amplitude modulation
Robustness
Sensitivity
Signal Shaping
Signal to noise ratio
Transceivers
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Beschreibung
Zusammenfassung:Probabilistic shaping of quadrature amplitude modulation (QAM) is used to enhance the sensitivity of an optical communication system. Sensitivity gains of 0.43 and 0.8 dB are demonstrated in back-to-back experiments by the shaping of 16QAM and 64QAM, respectively. Furthermore, numerical simulations are used to prove the robustness of probabilistic shaping to a mismatch between the constellation used and the signal-to-noise ratio (SNR) of the channel. It is found that, accepting a 0.1-dB SNR penalty, only four shaping distributions are required to support these gains for 64QAM.
ISSN:1041-1135
1941-0174
DOI:10.1109/LPT.2015.2514078