In order to maintain the reach of a typical 100G WAN transport system(~1500km),
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
正确答案：B
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