Abstract
This paper reports a comprehensive study of pump- to-signal
intensity modulation transfer (IMT) in single-pump fiber optic parametric
amplifiers (FOPAs). In particular, the IMT is studied for the first time for
high-frequency fluctuations of the pump as well as in the saturated gain regime.
The IMT cut-off frequency in typical single-pump FOPAs is around 100–200
GHz. The possibilities to shift this frequency based on dispersion and nonlinearities
involved in the parametric gain are discussed. The severe IMT to the signal
at low modulation frequencies can be suppressed by more than 50% in the gain
saturation regime with respect to the linear gain operation. Experimental
results confirm the validity of the numerical study.
© 2012 IEEE
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