International Conference Physics.SPb/2025
Fiber and integrated optics

Spatial current distribution in semiconductor optical amplifiers with ridge waveguides and quantum well-dot active region

A. A. Kharchenko^a, A. M. Nadtochiy^b, G. O. Kornyshov^c, N. Yu. Gordeev^c, A. S. Payusov^c, Yu. M. Shernyakov^c, A. A. Bekman^c, O. I. Simchuk^a, Yu. S. Tkach^a, M. V. Maksimov<sup>a

a</sup> Alferov Federal State Budgetary Institution of Higher Education and Science Saint Petersburg National Research Academic University of the Russian Academy of Sciences, St. Petersburg
^b National Research University "Higher School of Economics", St. Petersburg Branch
^c Ioffe Institute, St. Petersburg

Abstract: The spatial distribution of pump current in the active region of a quantum well-dot semiconductor optical amplifier was experimentally determined by identifying boundaries separating gain and absorption zones under varying injection currents and input wavelengths. The spatial non-homogeneity of the pump current distribution for a 5-microm-wide waveguide was found to be less than 14%.

Keywords: quantum well-dots, semiconductor optical amplifiers, transparency current, non-homogeneity of gain, spatial distribution.

Received: 06.05.2025
Revised: 01.07.2025
Accepted: 24.10.2025

DOI: 10.61011/OS.2025.10.61947.8115-25