L-band unrepeatered WDM experiment over 451 km using all-Raman amplification and ROPA

Unrepeatered distributed Raman link with ROPA combining 22times10.7Gb/s and 3times43Gb/s NRZ DPSK signals in L-band is demonstrated. The net span loss was 80 dB over 451 km of ldquolegacyrdquo G.654 fiber.