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Room-temperature slow light with semiconductor quantum-dot devices

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Abstract

We demonstrate room-temperature slow light that is electrically and optically controllable by using a quantum-dot (QD) semiconductor optical amplifier (SOA) at zero and low bias below the transparency current. The absorption spectrum of the QD SOA exhibits a spectral dip with a corresponding group-index dispersion and group delay owing to coherent population oscillation caused by the interaction of pump and probe laser light near resonance of the first heavy-hole–conduction-state transition. At an optical pump power of 0.3mW inside the single-mode waveguide without current injection, a group-index change of 3.0 with a bandwidth of 2GHz was measured. This group-index change can be controlled by injection of electrical current and by changing the optical pump power.

© 2006 Optical Society of America

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