期刊
JOURNAL OF LIGHTWAVE TECHNOLOGY
卷 36, 期 22, 页码 5298-5308出版社
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/JLT.2018.2871248
关键词
Communications theory; coded modulation; non-uniform signaling; probabilistic amplitude shaping; non-binary codes; BICM; optical networks; nonlinear optics
资金
- French National Research Agency (ANR) [ANR-17-CE25-0007]
A class of circular 64-QAM that combines geometric and probabilistic shaping aspects is presented. It is compared to square 64-QAM in back-to-back, single-channel, and wavelength division multiplexing (WDM) transmission experiments. First, for the linear additive white Gaussian noise channel model, it permits to operate close to the Shannon limits for a wide range of signal-to-noise ratios. Second, WDM simulations over several hundreds of kilometers show that the obtained signal-to-noise ratios are equivalent to-or slightly exceed-those of probabilistic shaped 64-QAM. Third, for real-life validation purpose, an experimental comparison with unshaped 64-QAM is performed where 28% distance gains are recorded when using 19 channels at 54.2 GBd. This again is in line-or slightly exceeds-the gains generally obtained with probabilistic shaping. Depending upon implementation requirements (core forward-error correcting scheme for example), the investigated modulation schemes may be key alternatives for next-generation optical systems.
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