This two-stage fiber optic amplifier, based on the physical properties of optical fiber doped with erbium ions, provides a high level of signal amplification with low noise and uniformity of amplification. The device is characterized by long-term reliability. The amplifier's assembly method allows for partial replacement of its electronic or optical components, significantly improving its maintainability. The fiber-optic amplifier manufacturing structure, formed at ITMO University, serves as a foundation for scientific research, training high-level specialists, and creating jobs in the fields of fiber optics, electronics, and programming.