Erbium-doped fiber Amplifier (EDFA) is the first optical amplifier successfully developed by the University of Southampton in England in 1985. It is one of the greatest inventions in optical fiber communication. Since the late 1980s, erbium-doped fiber amplifiers have made great breakthroughs. WDM technology has greatly increased the capacity of optical fiber communication. It is the most widely used optical amplifier in optical fiber communication.
The main advantages of EDFA are high gain, large bandwidth, high output power, high pump efficiency, low insertion loss and polarization insensitivity.And mainly composed of 5 parts: erbium-doped fiber (EDF), Optical coupler (WDM), Optical isolator (ISO), Optical Filter and pump Supply.
