Single-laser 32.5 Tbit/s Nyquist WDM transmission
David Hillerkuss (1), Rene Schmogrow (1), Matthias Meyer (1), Stefan, Wolf (1), Meinert Jordan (1), Philipp Kleinow (1), Nicole Lindenmann (1),, Philipp C. Schindler (1), Argishti Melikyan (1), Xin Yang (2), Shalva, Ben-Ezra (3), Bernd Nebendahl (4), Michael Dreschmann (1)

TL;DR
This paper demonstrates a high-capacity optical communication system achieving 32.5 Tbit/s over 227 km using a single laser source and Nyquist WDM, without dispersion compensation, by employing sinc-shaped pulses and advanced digital signal processing.
Contribution
The work introduces a single-laser, high spectral efficiency Nyquist WDM system with real-time digital signal generation for ultra-high capacity transmission.
Findings
Achieved 32.5 Tbit/s over 227 km without dispersion compensation.
Used 325 carriers from a single laser with 12.5 GHz spacing.
Attained 6.4 bit/s/Hz spectral efficiency.
Abstract
We demonstrate 32.5 Tbit/s 16QAM Nyquist WDM transmission over a total length of 227 km of SMF-28 without optical dispersion compensation. A number of 325 optical carriers are derived from a single laser and encoded with dual-polarization 16QAM data using sinc-shaped Nyquist pulses. As we use no guard bands, the carriers have a spacing of 12.5 GHz equal to the Nyquist bandwidth of the data. We achieve a high net spectral efficiency of 6.4 bit/s/Hz using a software-defined transmitter which generates the electrical modulator drive signals in real-time.
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