问题详情

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请帮忙给出正确答案和分析，谢谢！