In order to maintain the reach of a typical 100G WAN transport system(~1500km), several sy

In order to maintain the reach of a typical 100G WAN transport system(~1500km), several system improvements have to be made to recover the lost (93)，including the use of low-loss low-nonlinearity(94)，Raman amplification,and stronger error correction.

A.noise

B.SNR

C.speed

D.error