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European Quantum Electronics Conference (EQEC)

Optical pulse storage and forwarding with multi-wavelength conversion

W.C.R. Nascimento, D. P. Caetano, J. Miguel Hickmann

Published Jan 18, 2006• 0 citations
Publisher

Abstract

This study demonstrates a different type of all-optical switch with multi-wavelength conversion, capable of storing and controllably forwarding optical pulses. The mechanism behind this device is electromagnetically induced transparency, where an optical signal interacts resonantly with a three-level atomic system and a control field. To describe the dynamics of this system, a set of coupled partial differential equations is solved numerically.

DOI
10.1109/eqec.2005.1567274

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This study demonstrates a different type of all-optical switch with multi-wavelength conversion, capable of storing and controllably forwarding optical pulses. The mechanism behind this device is electromagnetically induced transparency, where an optical signal interacts resonantly with a three-level atomic system and a control field. To describe the dynamics of this system, a set of coupled partial differential equations is solved numerically.
Based in the effect of the Electromagnetically Induced Transparency (EIT) and the storage of light in atomic medium, we propose multi-wavelength optical pulse conversion. Starting from coupled Maxwell-Bloch equations, we simulate the propagation of the optical pulses resonant with electric dipole transition in the atomic system. Considering a three level Λ-type atomic system, we investigate the effect of the storage of light under EIT and we approach the wavelength conversion process using a double-Λ system. Generalizing the process for a triple-Λ system, we show the possibility of multi-wavelength conversion of a field previously stored in the atomic system. In this last case, we simulate the propagation of the six fields interacting resonantly, where three of the fields are called control fields and others are probe fields. First only two fields are incident in the medium, a probe Field and a control field, thus we establish the EIT regime. When we turn off the control field, the probe field is stored in the medium as a collective excitation between the lower energy levels which corresponds to a dark state of the atomic system. Depending on the choice of the control field which is turned on, we show that it is possible to store a field for a given a time and later to release it in differents wavelengths.
Summary form only given. Electromagnetically induced transparency (EIT) refers to a phenomenon, whereby the optically resonant transition is rendered nearly transparent by applying a strong coupling laser field. The mechanism of EIT is usually explained in terms of quantum coherence or quantum interference. This EIT has attracted increasing interest because absorption associated with nonlinear optical processes can be removed. In the typical three-level /spl lambda/-system, which includes the ground state and the metastable state, when the atomic population is prepared in the superposition of the states by the coupling fields, the optical response of the media to the probe field is significantly modified. Since this is a coherent control of an electric field by another field via the atomic coherence, several schemes to control light coherently have been suggested. We propose an optical coherent control scheme of the polarization of optical pulses using the EIT quantum coherence, and numerically study its applicability to fast optical switching.
Summary form only given. The reduced absorption and enhanced nonlinearity in a three-level electromagnetically induced transparency (EIT) system are very important in achieving an effective all-optical switching action. The Kerr-nonlinear index of refraction of a three-level EIT medium can be greatly enhanced near resonance due to atomic coherence induced in such a system in comparison with a two-level atomic system, as we have shown by using an optical ring cavity. Both the magnitude and sign of the Kerr-nonlinear index change dramatically for different frequency detunings of the controlling (or coupling) or cavity (or probe) field. Bistability and dynamic instability occur when such a three-level /spl Lambda/-type EIT system is placed inside an optical ring cavity and the controlling and cavity input intensities to exceed certain threshold values. In this paper, we present a recent experimental demonstration of controlling the cavity output intensity by modulating the frequency detuning of the controlling beam.