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Distributed Raman amplification in the transmission fiber is an attractive technique to increase the transmission capacity and to extend the reach of long-haul WDM optical system [1]. The next generation WDM system is expected to offer transmission in the wide range of S, C, and L band. A single Raman pump wavelength provides flat gain in the limited wavelength range of approximately 15nm. However, multi-wavelength pumping at 12 different pump wavelengths allows to offer high gain and very good gain flatness over the wavelength range of up to 100nm [2].
© 2002 Optical Society of America
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