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This paper reports the longest 100G unrepeatered transmission distance to date. Enhanced ROPA, 100G coherent transceiver, commercial Raman system, and 557-km cabled large A eff ultra-low loss fiber in OSP environment are used in the trial.

15 Tb/s unrepeatered transmission is achieved over 409.6 km (68.2 dB) of large effective area fiber using forward and backward distributed Raman amplification and a remotely-pumped erbium-doped optical amplifier. This result provides a record capacity-reach product of 6.14 Pb/s-km over a single fiber type. We also demonstrate channel growth from 10 to 150 waves within 61 nm amplification bandwidth.

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