Real-time, error-free 16QAM transmission at a record spectral efficiency of 6.21 b/s/Hz enables transatlantic (6,644 km) fiber capacity of 26.2 Tbps, using precision, multi-carrier common wavelocking; digitally synthesized subcarriers; near-Nyquist pulse shaping; and largearea, positive dispersion fiber.

© 2019 The Author(s)

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