Abstract
There is much current interest in fiber Raman amplifiers pumped at multiple wavelengths (MW-FRA), which can combine the low-noise advantage of distributed Raman amplification with the possibility of ultra-wide (80 nm and above) gain bandwidths.1–2 Also, multiple pumps can be used to equalize the gain over such large bandwidths, but it has been a challenge to design MW-FRA with the flattest possible gain profiles.3 Recently, several methods have been proposed on how to select the appropriate combinations of pump wavelengths and powers, 4–6 but their resulting amplifier gain flatness proves to be far from optimal. The optimization method of Ref.
© 2002 Optical Society of America
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