[c-nsp] 400Gbps over 12,800km of fibre

[Adam Vitkovsky]

If I understood it correctly, instead of one, they have send two waves, one
over the other - which made the nonlinear distortions at each of the waves
to cancel each other out. 

Phase-conjugated twin waves for communication beyond the Kerr nonlinearity
limit. 
http://www.nature.com/nphoton/journal/vaop/ncurrent/full/nphoton.2013.109.ht
ml


adam