Attaining Near-Zero Linewidth Enhancement in Quantum-Dot Semiconductor Optical Amplifiers

This paper presents a numerical approach to achieve near-zero linewidth enhancement (LE) in Quantum Dot Semiconductor Optical Amplifiers (QD-SOAs). The focus is on leveraging discrete energy levels and the corresponding tunability of Quantum Dots (QDs) to minimize carrier fluctuations by examining QD carrier concentration, tuning the QD emission frequency, and investigating the carrier collision rate to assess the influence of the non-radiative process in LE. The objective is to come up with the optimal electronic structure for QDSOAs regarding LE minimization and enhanced beam coherence. Numerical simulations demonstrate results consistent with empirical findings.