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Conference on Lasers and Electro-Optics Pacific Rim (CLEO-PR)

Low-Light-Level All-Optical Switching

Ite A. Yu, Chang-Yi Wang, Yong-Fan Chen, Sheng-Chiun Lin, Wei-Hsun Lin, Pei-Chen Kuan

Published Aug 1, 2007• 1 citation
Publisher

Abstract

We propose and experimentally demonstrate an all-optical switch that utilizes the light-storage technique. The energy of the retrieved probe pulse is reduced to 10% due to the presence of the switching pulse with one photon per atomic cross section. A single photon switched by another is feasible in this scheme.
DOI
10.1109/cleopr.2007.4391670

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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.
We have experimentally and theoretically studied the scheme of all-optical switching based on stored light pulses. In the scheme, a probe pulse is stored in the medium by the effect of electromagnetically induced transparency and a switching pulse is applied during the storage in order to turn off the probe transmission in the retrieval process. Our study takes into account the attenuation of the switching pulse induced by the stored probe pulse. The consistency between the experimental data and the theoretical predictions from the numerical calculation is satisfactory. We further derive the analytical expressions of energy losses of the probe and switching pulses. The results from the analytical expressions are in good agreement with those from the numerical calculation. Using the analytical expressions, we investigated the switching efficiency with the consideration of the Gaussian beam profile of the photon pulses and explored the feasibility of switching a single photon by another.