In long-distance transmission, the selection sequence of the scheme is usually as follows

Question

Options

• ABA->BA+PA->backward Raman->forward+backward Raman
• BBA+PA->BA->backward Raman->forward+backward Raman
• CBA->BA+PA->forward+backward Raman->backward Raman
• DBA->backward Raman->BA+PA->forward+backward Raman

• A
  81% (39)
• B
  10% (5)
• C
  6% (3)
• D
  2% (1)

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