Nokia Certified Network Professional – IP/MPLS Services — Question 2

What is the function of a pre-amplifier in an optical network?

Answer options

• 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.

Correct answer: A

Explanation

The correct answer is A because a pre-amplifier is used at the receiver side to boost the optical signal after it has traveled through the fiber. Option B is incorrect as it refers to amplification at the transmitter side, which is not the function of a pre-amplifier. Options C and D also misrepresent the role of the pre-amplifier in the optical network.