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Slow and Fast Light (SL)

Slow and Fast Light in an Electro-Absorber

F. Öhman, Andres Bermejo Ramirez, Salvador Sales, Jesper Mørk

Published Jan 1, 2006• 0 citations
Publisher

Abstract

We demonstrate controllable and large time delay in cascaded semiconductor saturable absorbers and amplifiers. The possibility of further increasing the tuneable phase shift by utilizing field screening effects in the quantum well absorber is demonstrated.
DOI
10.1364/sl.2006.mc5

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In contrast to absorbers, where the delay time via wave mixing saturates to its maximum with increasing device length due to decay of pump power along the device, in semiconductor optical amplifiers (SOAs) the delay time increases with the device length and is limited by the corresponding growth of the SOA gain, which can lead to unacceptable amplified stimulated emission in the SOA. The number of pulses which can be stored in an SOA, defined by the gain and group velocity dispersion, also is given ultimately by this SOA gain limitation, and is estimated between one and two.