The issue of temporal pulse distortion occurring during amplification process in a 2-stage, fiber amplifier, operating in
the eye-safe spectral region, is discussed. The amplifier was built in a Master Oscillator Power Amplifier (MOPA)
configuration and seeded by a distributed feedback (DFB) laser providing nanosecond pulses at a repetition rate of 20
kHz. It operated at a wavelength of 1549.13 nm and generated over 200 mW of output power with a slope efficiency of
up to 28%. The comparison between the calculated and measured results on saturation-induced pulse shape deformation,
for ~300-ns pulses, is presented. The analyzed pulse shapes embraced rectangle, Gaussian, triangle and "M" letter.
"Pulse shape distortion in a 2-stage all-fiber Er-doped amplifier", Proc. SPIE 8902, Electron Technology Conference 2013, 89021B (25 July 2013); doi: 10.1117/12.2030371; https://doi.org/10.1117/12.2030371