The advent of erbium-doped-fiber amplifiers (EDFA) has revolutionized the field of optical communications in two ways. First, their large optical gain allows long-haul unregenerated systems with optical repeaters spaced more than 100 km. Second, their large bandwidth permits to increase the capacity by an order of magnitude by wavelength-division multiplexing (WDM) several high bit rate channels.
© 1995 Optical Society of AmericaPDF Article
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