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arXiv:1002.3927 · Optics Letters

Experimental demonstration of enhanced slow and fast light by forced coherent population oscillations in a semiconductor optical amplifier

Perrine Berger, Jérôme Bourderionnet, G. de Valicourt, R. Brenot, Fabien Bretenaker, Daniel Dolfi, Mehdi Alouini

Published Jul 13, 2010• 13 citations
arXivHTMLPDF

Abstract

We experimentally demonstrate enhanced slow and fast light by forced coherent population oscillations in a semiconductor optical amplifier at gigahertz frequencies. This approach is shown to rely on the interference between two different contributions. This opens up the possibility of conceiving a controllable rf phase shifter based on this setup.

DOI
10.1364/ol.35.002457

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We experimentally demonstrate enhanced slow and fast light by forced coherent population oscillations in a semiconductor optical amplifier at gigahertz frequencies. This approach is shown to rely on the interference between two different contributions. This opens up the possibility of conceiving a controllable rf phase shifter based on this setup.
The enhancement of the low frequency gain response of a microwave phase shifter based on slow light in a bulk reflective semiconductor optical amplifier (RSOA), by using forced coherent population oscillations (FCPO), is experimentally demonstrated. FCPO is achieved by simultaneously modulating the input optical power and bias current. The beat signal gain improvement ranges from 45 to 0 dB over a frequency range of 0.5 to 2.5 GHz, thereby improving the noise performance of the phase shifter. Tunable phase shifts of up to 40º are possible over this frequency range.
In this talk we show how slow and fast light effects arising from the nonlinear gain and refractive index dynamics within semiconductor optical amplifiers can be used to control the phase shift of microwave frequency signals. Theoretical predictions with experimental conformation will be shown as to how continuous phase shifting can be achieved and pay particular attention to the noise issue that arises in such phase shifters. Finally, applications of such phase shifters, including realizations of tunable microwave notch filters and tunable optoelectronic oscillators will be presented.
We present a theoretical study of the slow and fast light propagation in semiconductor optical amplifiers based on coherent population oscillations. By modulating the injection current to force the population oscillations we can modify the delay or advancement of light signals. Specifically, it is shown that the relative phase of the optical signal to the bias current modulations can be used as a knob for changing light propagation from delay to advancement. In addition, we analyze the effect of the modulation current for slow light in vertical cavity surface emission lasers (VCSELs) by taking into account the cavity effects. It is shown that the change of the depth of the modulation allows to tune the structural resonance, which in turn produces an enhancement of the delay.