Modeling differential transmission spectroscopy experiments in quantum dot optical amplifiers and saturable absorbers

Mattia Rossetti; Paolo Bardella; Ivo Montrosset

doi:10.1117/12.854417

27 April 2010 Modeling differential transmission spectroscopy experiments in quantum dot optical amplifiers and saturable absorbers

Mattia Rossetti, Paolo Bardella, Ivo Montrosset

Author Affiliations +

Proceedings Volume 7720, Semiconductor Lasers and Laser Dynamics IV; 77201I (2010) https://doi.org/10.1117/12.854417
Event: SPIE Photonics Europe, 2010, Brussels, Belgium

Abstract

We present a numerical model based on a time-domain travelling-wave approach to describe pulse propagation in InAs Quantum-Dot (QD) based Semiconductor Optical Amplifiers (SOA) and Saturable Absorbers (SA). The one-dimensional field propagation equation is solved in the time domain, in the slowly varying envelope approximation and it is coupled to a set of multi-population rate-equations modeling carrier dynamics in the QD layers in each longitudinal section of the waveguide. The optical response of the QD active medium is introduced in the field equation via a proper polarization term described as a set of infinite impulse response numerical filters. The inhomogeneous broadening of the density of states of the QD system induced by the QD size dispersion is properly taken into account. The influence of a static electric field on carrier dynamics in a reversely biased SA is described in the rate equations via bias dependent thermionic escape rates and tunneling processes. Absorption dynamics in a QD SA shows an initial ultrafast, bias independent recovery, followed by a slower recovery strongly dependent on the applied reverse bias. The QD SOA shows instead a dominant ultrafast gain recovery on a subpicosecond time scale at both QD Ground-States (GS) and first Excited-States (ES₁) wavelengths. Direct capture/escape processes between quantum well states and deeply confined QD states slightly influence the gain and absorption dynamics.

Citation Download Citation

Mattia Rossetti, Paolo Bardella, and Ivo Montrosset "Modeling differential transmission spectroscopy experiments in quantum dot optical amplifiers and saturable absorbers", Proc. SPIE 7720, Semiconductor Lasers and Laser Dynamics IV, 77201I (27 April 2010); https://doi.org/10.1117/12.854417

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