Rare-earth-doped fiber amplifiers utilize optical fibers doped with rare-earth elements (such as erbium and ytterbium) as the gain medium, exciting doped ions to high energy levels via pump light to achieve stimulated emission amplification of optical signals. They offer advantages such as high gain, low noise, and high bandwidth, and are widely used in optical communications, fiber optic sensing, LiDAR, and other fields. Based on their position and functional differences in the link, fiber amplifiers are typically classified into three types: pre-amplifiers (PA), booster amplifiers (BA), and line amplifiers (LA). PA amplifiers combine high gain and low noise characteristics, used for amplifying weak optical signals to enhance the system's detection capability for weak signals; BA amplifiers are used to increase the emission power of laser light sources, outputting high-power optical signals; LA amplifiers combine the advantages of PA and BA, balancing high gain and relatively high output power, suitable for fiber link relay or branch loss compensation. It supports three operating modes: APC (Automatic Power Control), ACC (Automatic Current Control), and AGC (Automatic Gain Control), which can be flexibly switched according to application scenarios. Additionally, the product supports flexible customization of parameters such as wavelength, power, gain, and packaging form. For specific requirements, please consult LBTEK technical support.