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Low-light-level all-optical switching
Authors:Wang Chang-Yi  Chen Yong-Fan  Lin Sheng-Chiun  Lin Wei-Hsun  Kuan Pei-Chen  Yu Ite A
Institution:Department of Physics, National Hsing Hua University, Hsinchu, Taiwan 300, China.
Abstract:We propose an all-optical switch that utilizes the technique of storage and retrieval of light pulses. A single photon (probe pulse) switched by another (switching pulse) is feasible, and the on-off ratio can be as large as 10 dB. We have experimentally demonstrated that the energy of the retrieved probe pulse is reduced to about 10% because of the presence of a switching pulse with an energy per unit area of one photon per lambda(2)/(2pi). The achieved result does not depend on the coupling intensity, the atomic optical density, or the width and shape of the switching pulse.
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