Self-pulsing in single section ring lasers based on Quantum Dot materials: theory and simulations

TL;DR

This paper presents a theoretical study of quantum dot-based single section ring lasers, revealing self-pulsing behavior and ultra-short pulse generation due to RNGH-like instability, supported by simulations and stability analysis.

Contribution

It introduces a new understanding of multimode dynamics and self-pulsing in quantum dot ring lasers through combined simulations and stability analysis.

Findings

Self-mode-locking leads to sub-picosecond pulses

THz repetition rate achieved in simulations

RNGH-like instability triggers multimode dynamics

Abstract

We studied theoretically coherent phenomena in the multimode dynamics of single section semiconductor ring lasers with Quantum Dots (QDs) active region. In the unidirectional ring configuration our simulations show the occurrence of self-mode-locking in the system leading to ultra-short pulses (sub-picoseconds) with a THz repetition rate. As confirmed by the Linear Stability Analysis (LSA) of the Traveling Wave (TW) Solutions this phenomenon is triggered by the analogous of the Risken-Nummedal-Graham-Haken (RNGH) instability affecting the multimode dynamics of two-level lasers.