Semiconductor optical amplifier parameter extraction using a wideband steady-state numerical model and the Levenberg-Marquardt method

In this paper, an accurate wideband SOA steady-state numerical model, amplified spontaneous emission (ASE) spectrum and signal gain versus bias characteristic measurements and a numerical implementation of the Levenberg-Marquardt method are used to determine the material parameters of a homogeneous buried ridge stripe SOA with a bulk active region (0.4 μm × 0.4 μm cross-section). The numerical techniques have been incorporated into comprehensive SOA simulation software AmpSoft developed at the University of Limerick that enables accurate wideband prediction of SOA static characteristics. The extracted SOA parameters are B₀ = 2.8 × 10^-16 m³s^-1 B₁= 0.1 × 10^-41 m⁶s^-1, A_nrad = 4.8 × 10⁸s^-1 C_aug = 2.8 × 10^-41 m⁶s^-1, K_g = 0.48 × 10^-10 eVm, K₀= 2800 m^-1 and K₁= 4400 m².