What is the function of a pre-amplifier in an optical network?
A.
Through the pre-amplifier, the optical signal is amplified at the receiver side after it travels along the fiber from another node.
B.
Through the pre-amplifier, the optical signal is amplified at the transmitter side before it is sent to the line span.
C.
Through the pre-amplifier, the optical signal is amplified both the receiver side and at me transmitter side.
D.
Through the pre-amplifier, the optical signal is amplified within the node internally to recover internal losses due, for instance, to cascaded filters.
Answer A: Pre-amplifier is an amplifier installed at the receiver end,Booster is an amplifier installed at the transmitter's side while the in-line amplifier(ILA) is amplifier node that has no mux/dem installed .
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