Phase-matching and mitigation of four-wave

Abstract:
We present a theoretical study of four-wave mixing interactions
in fibers in the presence of gain. In contrast to passive fibers, positive gain
at the pump wavelength leads to constructive generation of the signal and
idler waves, even in the case of large phase-mismatch, so that FWM
processes can be very efficient even in isotropic single-mode fibers with
normal dispersion. We also propose simple ways to mitigate these
parametric interactions by applying a controlled variation of the phasemismatch
along the fiber. These concepts apply to all optical amplifiers.

Author:
Jean-Philippe Fève

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