Constellation shaping for high symbol rate SNR limited transceivers

Autor: Pat Day, Alban Le Liepvre, Stefan Wolf, Parthiban Kandappan, Robert Maher, O. Khayam, Parmijit Samra, Samantha Nowierski, An Nguyen, S. Koenig, Fred A. Kish, Mehrdad Ziari, Jeffrey T. Rahn, Mehdi Torbatian, Z. Wang, Stephanie Tremblay, Mark J. Missey, Xiaojun Xie, Ryan Going
Rok vydání: 2019
Předmět:
Zdroj: Next-Generation Optical Communication: Components, Sub-Systems, and Systems VIII.
DOI: 10.1117/12.2509151
Popis: The information rate (IR) of a digital coherent transceiver is constrained by the inherent practical signal-to-noise ratio (SNR) limit. Coded modulation, which is the combination of multi-level modulation and forward error correction, aims to maximize the IR within this SNR envelope. While probabilistic constellation shaping has enhanced this methodology by providing an increase in IR over conventionally employed square quadrature amplitude modulation (QAM) formats, it is the ability to eloquently tune the per wavelength IR by varying the symbol probabilities that has gained this scheme significant traction within optical communications in recent years. As commercial line cards continue their evolution towards 100 GBd and to modulation formats beyond 64QAM, we discuss the merits of probabilistic shaping for high symbol rate digital coherent transceivers in the presence of a practical SNR limit.
Databáze: OpenAIRE