Câu 2: 4A0-205: Nokia Optical Networking Fundamentals

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

1. A. Through the pre-amplifier, the optical signal is amplified at the receiver side after it travels along the fiber from another node. — đáp án hiện tại
2. B. Through the pre-amplifier, the optical signal is amplified at the transmitter side before it is sent to the line span.
3. C. Through the pre-amplifier, the optical signal is amplified both the receiver side and at me transmitter side.
4. D. Through the pre-amplifier, the optical signal is amplified within the node internally to recover internal losses due, for instance, to cascaded filters.