Abstract
We studied the gain of Raman-assisted fiber optical parametric amplifiers
(RA-FOPAs) both theoretically and experimentally. We investigated the relationship
between the overall gain and different combinations of Raman and parametric
pump powers using contour maps. We derived a normalized phase-matched model
to determine the general behavior the peak gains of RA-FOPAs operating in
the small signal region. The contour maps of the combined gain enhancement
can be used to optimize both indirect and direct Raman gain of the signal/idler
in RA-FOPAs. We showed that, in a given fiber, it is possible to optimize
the Raman and parametric pump powers in RA-FOPAs for high gain and high efficiency.
© 2011 IEEE
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