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Conference on Lasers and Electro-Optics

Spectral characteristics of gain and noise saturation in nonlinear InAs/InP quantum dash optical amplifiers

Robert Alizon, D. Hadass, A. Bilenca, Hanan Dery, Vissarion Mikhelashvili, Gad Eisenstein, Ruth Schwertberger, J.P. Reilhmaier, A. Forchel, M. Calligaro, S. Bansropun, Michel M. Krakowski

Published Jan 1, 2004• 0 citations
OpenAlex

Abstract

Gain and noise saturation spectra of quantum-dash optical amplifiers were measured to be asymmetric due to the inhomogeneous gain and their quantum wire like nature. Direct measurement of the homogeneously broadened gain bandwidth yields 15 nm.

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Applied Physics Letters•Sep 27, 2010•25 citations
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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.