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Optical Amplifiers and Their Applications

Slow Light in Quantum-Well and Quantum-Dot SOAs

S. L. Chuang, Hui Su, Shu‐Wei Chang, P. Kondratko

Published Jan 1, 2006• 0 citations
Publisher

Abstract

Slow light and fast light at room temperature using coherent population oscillation effects in quantum-well and quantum-dot semiconductor optical amplifiers are demonstrated experimentally and compared well with theoretical results.
DOI
10.1364/oaa.2006.ome2

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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 approximately 0.3 mW inside the single-mode waveguide without current injection, a group-index change of 3.0 with a bandwidth of 2 GHz was measured. This group-index change can be controlled by injection of electrical current and by changing the optical pump power.