Optical fiber amplifier refers to a new type of all-optical amplifier used in optical fiber communication lines to achieve signal amplification. Among the currently practical fiber amplifiers, there are mainly erbium-doped fiber amplifiers (EDFA), semiconductor optical amplifiers (SOA) and fiber Raman amplifiers (FRA). Among them, erbium-doped fiber amplifiers are now widely used in long-distance applications due to their superior performance. It is used as power amplifier, relay amplifier and preamplifier in the fields of long-distance, large-capacity and high-speed optical fiber communication systems, access networks, optical fiber CATV networks, systems (radar multi-channel data multiplexing, data transmission, guidance, etc.).
Main applications and markets of fiber amplifiers;
Dense wavelength division multiplexing systems have become the mainstream technology in optical fiber transmission systems. As one of the core components of DWDM systems, fiber amplifiers will develop rapidly in their applications. This is mainly because fiber amplifiers have sufficient gain bandwidth and are compatible with WDM. The combination of technologies can quickly and easily expand the communication capacity of existing fiber optic cable systems and extend the relay distance. In the optical fiber access network, although the distance of the user system is short, the user network has too many branches. Optical fiber amplifiers are needed to increase the power of the optical signal to compensate for the optical loss caused by the optical distributor and increase the number of users, thus reducing the number of users. Network construction costs.
In the optical fiber CATV system, as its scale continues to expand, the transmission distance of the link continues to increase, and the transmission loss of the optical path also continues to increase. The application of optical fiber amplifiers in the optical fiber CATV system can not only increase the optical power, but also compensate for the loss of the link. loss, increases optical user terminals, simplifies the system structure, and reduces system costs.
In recent years, with the rapid development of information and communication technology, the research and development of optical fiber amplifiers (wireless signal amplifiers) has further expanded the gain bandwidth, pushing the optical fiber communication system to the direction of high speed, large capacity, and long distance. Due to the unique properties of optical fiber amplifiers, optical fiber amplifiers will be increasingly used in DWDM transmission systems, optical fiber CATV and optical fiber access networks.