How does a Raman pump work in the 1830 specific implementation?

How does a Raman pump work in the 1830 specific implementation?
A . The amplification is done simultaneously for all channels as they enter the board.
B. As the incoming signal power increase, the gain of the amplifier is reduced.
C. The pump light travels in the same direction of the signal, amplifying it while it flows in the fiber towards the following node.
D. The pump light travels in the opposite direction of the signal to be amplified, amplifying it while it arrives from the adjacent node.

View Answer

Answer: D

Explanation:

In Raman amplification, a pump laser is used to excite the Raman-active molecules in the fiber, which then amplifies the signal light as it travels in the opposite direction. In the 1830 specific implementation, the pump laser is typically a high-power laser that is launched into the fiber in the opposite direction to the signal. The pump light interacts with the Raman-active molecules in the fiber, which then amplifies the signal light as it travels in the opposite direction. This allows the Raman pump to provide a gain that increases with distance, which can be used to compensate for the loss of signal power as it travels through the fiber.