Unrepeatered WDM transmission of single-carrier 400G (66-GBd PDM-16QAM) over 403 km


This paper demonstrates a record single-carrier 400 Gb/s unrepeatered WDM transmission over 403 km with 64.7-dB span loss. Using optimized amplification map with 1<sup>st</sup>-order Raman amplifiers, ROPAs, and 112/150-&#x03BC;m<sup>2</sup> A<inf>eff</inf> fibers, error-free transmission is demonstrated for 16&#x00D7;66 GBd-16QAM. 


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