SIMULATION OF YTTERBIUM DOPED FIBER AMPLIFICATION

Abstract

This report summarizes in detail a software tool that has been developed and for modeling doped fiber amplification accounting for gain, amplified spontaneous emission, group velocity dispersion and self-phase modulation. The innovative algorithms perform calculations for these active and passive effects simultaneously and this accounts for the complex-valued electric field ofchirped picosecond pulses. A comprehensive verification procedure is carried out for a selection of doped double-clad fiber amplifiers with Ytterbium and Thulium as the selected fiber core dopants under operating conditions and geometries defined in the journal articles being verified. These tests consider both continuous wave, nanosecond and picosecond pulsed amplification. Numerical modeling results are presented for a Ytterbium-doped double-clad fiber amplifier (YDFA) component in our hybrid master oscillator power amplifier (MOPA) system. Initial conditions include 7.7 ps pulses at a repetition-rate of 577 MHz and at a peak wavelength of 1075 nm and input linear and nonlinear chirps.