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Applied Physics Letters

A nearly instantaneous gain response in quantum dash based optical amplifiers

Amir Capua, G. Eisenstein, Johann Peter Reithmaier

Published Sep 27, 2010• 25 citations
Publisher

Abstract

We describe a unique phenomenon occurring in InAs/InP quantum dash amplifiers: a nearly instantaneous gain response taking place across the entire inhomogeneously broadened gain spectrum. The phenomenon is induced by a 100–150 fs pulse and is observable using multiwavelength pump probe measurements. Large bias levels and an intense pump pulse are imperative for enacting the ultrafast mechanism which is due to a combination of the gain inhomogeneity, nonlinear two photon absorption and the quantum wirelike density of state function.

DOI
10.1063/1.3494528

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We describe a unique phenomenon occurring in InAs/InP quantum dash amplifiers: a nearly instantaneous gain response taking place across the entire inhomogeneously broadened gain spectrum. The phenomenon is induced by a 100–150 fs pulse and is observable using multiwavelength pump probe measurements. Large bias levels and an intense pump pulse are imperative for enacting the ultrafast mechanism which is due to a combination of the gain inhomogeneity, nonlinear two photon absorption and the quantum wirelike density of state function.
We report on multi-wavelength pump-probe characterization of the fundamental gain dynamics in recently developed InAs/InP quantum-dot semiconductor optical amplifiers. Recovery of the gain at various wavelengths following a powerful optical pump pulse, was recorded at different bias levels and different excitation powers. Wavelength dependencies of gain saturation depth, of the level to which the gain recovers and of the recovery rates were obtained. Unlike in quantum-dash amplifiers, these quantum-dots exhibit no instantaneous gain response, confirming their zero-dimensional nature.