Abstract
We studied the use of multiple Raman pumps to assist fiber optical
parametric amplifiers (FOPAs). We derived a theoretical model to describe
the performance of multiple Raman pump assisted FOPAs. We demonstrated that
the over 40 nm flat gain bandwidth provided by the multiple Raman pumps can
be used to support the parametric gain bandwidth of Raman-assisted FOPAs
(RA-FOPAs). We also found that if indirect Raman gain contribution
dominates, by using dispersion-flattened highly nonlinear fiber with small
dispersion slope and polarization-mode dispersion effect, broadband FOPA
with broad parametric pump wavelength tuning range can be obtained by using
multiple Raman pump assistance. On the other hand, if direct Raman gain
contribution dominates, the parameters of the multiple Raman pumps have to
be chosen carefully to ensure that the Raman gain bandwidth matches the
parametric gain bandwidth in order to achieve a flat gain with broad gain
bandwidth in the RA-FOPAs.
© 2011 IEEE
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