Two-dimensional time-dynamic simulations of DFB lasers and MOPAs

Abstract

Due to the lateral structure of Distributed Feedback lasers (DFB) and Master Oscillator Power Amplifiers (MOPAs), the one-dimensional classical Transfer Matrix Method (TMM) as well as similar one-dimensional methods do not lead to satisfactory simulation results. Therefore, we present a two-dimensional simulation technique based on Trigonometric Finite Wave Elements (TFWE) — a generalization of the TMM in two or three dimensions — that solves the time-dependent wave equation. By coupling the wave equation with a temperature and a drift-diffusion model, we can simulate the time-dynamic behavior of DFB lasers and MOPAs. Furthermore, by Fourier transformation, we can investigate which modes and which frequencies appear. In this way, the influence of the injected current and of the stripe width on the resulting modes and on the output power can be analyzed in detail.