Design optimization of passively mode-locked semiconductor lasers with intracavity grating spectral filters

TL;DR

This paper presents a method for optimizing the placement of intracavity spectral filters in passively mode-locked semiconductor lasers to maximize stable operation regions, validated through simulations and experimental data.

Contribution

It introduces a novel approach combining analytic gain models and numerical simulations to determine optimal filter locations for enhanced laser stability.

Findings

Optimal filter placement extends stable mode-locking range.

Model predictions agree qualitatively with experimental phase-space data.

Method can be adapted for different device configurations.

Abstract

We consider design optimization of passively mode-locked two-section semiconductor lasers that incorporate intracavity grating spectral filters. Our goal is to develop a method for finding the optimal wavelength location for the filter in order to maximize the region of stable mode-locking as a function of drive current and reverse bias in the absorber section. In order to account for material dispersion in the two sections of the laser, we use analytic approximations for the gain and absorption as a function of carrier density and frequency. Fits to measured gain and absorption curves then provide inputs for numerical simulations based on a large signal accurate delay-differential model of the mode-locked laser. We show how a unique set of model parameters for each value of the drive current and reverse bias voltage can be selected based on the variation of the net gain along branches of steady-state solutions of the model. We demonstrate the validity of this approach by demonstrating qualitative agreement between numerical simulations and the measured current-voltage phase-space of a two-section Fabry-Perot laser. We then show how to adapt this method to determine an optimum location for the spectral filter in a notional device with the same material composition, based on the targeted locking range, and accounting for the modal selectivity of the filter.