Introduction of erbium-doped fiber amplifier
The erbium-doped fiber amplifier (EDFA, the optical signal amplifier incorporating the erbium ion Er3 + in the core through which the signal passes) was the first optical amplifier developed by the University of Southampton in 1985. It is the greatest fiber optic communication. One of the inventions. The erbium-doped fiber is a fiber in which a small amount of rare earth element erbium (Er) ions are doped into the quartz fiber, which is the core of the erbium-doped fiber amplifier. Since the late 1980s, research work on erbium-doped fiber amplifiers has continued to make major breakthroughs. WDM technology greatly increases the capacity of fiber-optic communication. It has become the most widely used optical amplifier component in fiber optic communications.