The raman amplifier uses multi-pump laser combination and depolarization technology, and achieves low noise optical signal amplification in C-band by combining different types of pumped lasers and matching the types of optical fibers. The module has built-in well-designed driving circuit and logic control circuit, and cooperates with 14xx pump laser of telecommunication level to achieve high-performance output. The stability of output power is guaranteed by the unique design of ATC and APPC circuits. In order to protect the safety of equipment and person, the amplifier has a variety of detection and protection measures to ensure the safe and stable operation of products.