Concatenated FEC experiment over 5000 km long straight line WDM test bed

摘要

A concatenated forward error correction (FEC) code yielded 10-dB coding gain in a straight line laboratory experiment over a 5000-km optically amplified test bed. We used this margin to reduce power per channel, and thus nonlinearities, allowing us to demonstrate channel spacings as close as 0.13 nm for 2.5 Gbit/s transmission.