Record 500 km unrepeatered 1 Tbit/s (10x100G) transmission over an ultra-low loss fiber Corning SMF-28 ULL fiber (the average attenuation of the spools used in this experiment <0.160 dB/km), and optimization of remotely-pumped optical ... V Gainov,N Gurkin,S Lukinih,... - 《Optic...