Optical amplifiers extend the optical link power budget for building long-distance dense wavelength division multiplexing (DWDM) networks by amplifying up to 96 wavelengths (the full C-band). Optical amplifier types include Raman and three main types of Erbium-doped fiber amplifier (EDFAs): booster, inline, and pre-amplifier. Optical amplifiers form an amplified optical transport network (OTN) link over long distances, without the need for regenerators or for building ROADM networks. The feature set of optical amplifiers includes remote management, configuration, and monitoring via an optical supervisory channel (OSC).
