Journal
JOURNAL OF LIGHTWAVE TECHNOLOGY
Volume 40, Issue 18, Pages 6071-6077Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/JLT.2022.3188577
Keywords
Nonlinear Fourier transform; optical communication systems
Funding
- Israel Science Foundation [466/18]
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Nonlinear frequency division multiplexing (NFDM) is a promising concept in optical fiber communications, and it can improve spectral efficiency by using Hermite-Gaussian spectral carriers.
The nonlinear frequency division multiplexing (NFDM) is a promising concept in the field of optical fiber communications. Based on a well established mathematical technique of the nonlinear Fourier transform (NFT), a data modulation scheme has been suggested, which is intrinsically immune to Kerr nonlinearity and chromatic dispersion. However, most NFDM systems still suffer from low values of spectral efficiency due to the large burst sizes and the nonlinear interaction of the signal and the inline amplifier noise. Here, we show that this problem can be partially circumvented by using the Hermite-Gaussian spectral carriers. Using this approach, we are able to report a significantly higher spectral efficiency for NFDM schemes approaching 4.5 bits/s/Hz for a single polarization while keeping the hit error rate of uncoded input below the 7% hard decision forward error correction threshold.
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