557-km unrepeatered 100G transmission with commercial raman DWDM system, enhanced ROPA, and cabled large Aeff ultra-low loss fiber in OSP environment

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