For used in single-mode fiber __________ are used preferably. – McqOptions

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1.	For used in single-mode fiber __________ are used preferably.
A.	Semiconductor optical amplifier
B.	Erbium-doped fiber amplifier
C.	Raman fiber amplifier
D.	Brillouin fiber amplifier
Answer» B. Erbium-doped fiber amplifier

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