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In long-distance transmission, the selection sequence of the scheme is usually as follows
- A . BA->BA+PA->backward Raman->forward+backward Raman
B. BA+PA->BA->backward Raman->forward+backward Raman
C. BA->BA+PA->forward+backward Raman->backward Raman
D. BA->backward Raman->BA+PA->forward+backward Raman
Suggested Answer: A
Posted : 08/02/2023 9:43 pm