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What is BA LA PA in DWDM system?

What is BA LA PA in DWDM system?

Many model options serve all the traditional amplifier applications in an extended optical link:BA booster amplifier , LA in-line amplifier, and PA pre-amplifier.
A BA booster amplifier operates at the transmission side of the link. It features high input power, high output power, and medium optical Gain . Boosters are designed to amplify aggregated optical input power for reach extension.
An LA in-line amplifier operates in the middle of an optical link. It features medium to low input power, high output power, high optical Gain , and a low noise figure. In-line amplifiers are designed for optical amplification between two network nodes on the main optical link.
A PA Pre-amplifier operates at the receiving end of an optical link. It features medium to low input power, medium output power, and medium Gain. Pre-amplifiers are designed for optical amplification to compensate for losses in a demultiplexer located near the optical receiver.