Abstract: Due to the PCF high nonlinearity and low dispersion slope, in order to obtain high flattened gain over a wide bandwidth of two-pump fiber-optic parametric amplifiers (2P-FOPA) based on the triangular photonic crystal fiber (PCF), the shifted and scaled fourth-order Chebyshev polynomial is presented. Using the above polynomial gain ripple characteristic, expressions for the gain and bandwidth are derived, and numerical simulations are performed. A comparison of its performance with that of FOPAs based on the dispersion-shifted fiber (DSF) is also made. It is shown that less than±0.5dB gain flatness can be obtained over the80nm bandwidth by the 2P-FOPAs based on the triangular photonic crystal fiber. Finally, a PCF-based fiber optic parametric amplifier to reduce the influence of stimulated Raman scattering (SRS) is designed.

Key words: fiber optical parametric amplifier, photonic crystal fiber, two-pump, dispersion profile, nonlinearity