We demonstrates record single-carrier 50Gb/s, 100Gb/s, 200Gb/s and 400Gb/s unrepeatered transmission over 670.64km, 653.35km, 601.93km and 502.13km respectively. Using optimized Raman amplifiers, cascaded RGUs, ultra low-loss & 130-μm2 Aeff fibers, and optimal modulation format.

© 2019 The Author(s)

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