Erbium-doped fiber amplifier (EDFA, that is, an optical signal amplifier with erbium ion Er3 + doped in the core of the signal passing through) is the first optical amplifier developed by the University of Southampton in the UK in 1985. It is the greatest optical amplifier in optical fiber communication. One of the inventions. Erbium-doped fiber is an optical fiber doped with a small amount of rare earth element erbium (Er) ions in a quartz fiber, and it is the core of an erbium-doped fiber amplifier. Since the late 1980s, the research work of erbium-doped fiber amplifiers has continuously made major breakthroughs. WDM technology has greatly increased the capacity of optical fiber communications. Become the most widely used optical amplifier device in current optical fiber communication. Application method 1. The power amplifier, after the multiplexer, is used to boost the power of multiple wavelength signals after multiplexing, and then transmit them. Since the signal power after multiplexing is generally relatively large, so, The noise figure and gain requirements of a power amplifier are not very high, but it is required to have a relatively large output power after amplification. 2. Line-Amplifier, after the power amplifier, is used to periodically compensate the line transmission loss. Generally, a relatively small noise index and a relatively large output optical power are required. 3. The pre-amplifier, before the demultiplexer, after the line amplifier, is used to amplify the signal and improve the sensitivity of the receiver (when the optical signal-to-noise ratio (OSNR) meets the requirements, larger input power It can suppress the noise of the receiver itself and improve the receiving sensitivity), the noise figure is required to be very small, and there is not much requirement for the output power.
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