Cascade amplification scheme with control of the amplified pulse spectral width

Abstract

We propose a new multistage fiber amplifier based on optical fibers with varying normal group velocity dispersion (GVD). Amplification is performed in the fiber sections with exponential growth of the normal dispersion. Amplification sections are altered by the sections of passive fibers with the decreasing normal GVD. The pulse chirp in dispersion decreasing fibers can be adjusted by the increment of dispersion variation enabling control of the pulse spectral width to keep it within an amplification band. To illustrate this concept numerical simulations are performed.