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IEEE Mediterranean Electrotechnical Conference (MELECON)

A proposal for all-optical buffering

Franco Chiaraluce, Ennio Gambi, M. Mazzone, Paola Pierleoni

Published Nov 27, 2002• 0 citations
Publisher

Abstract

The possibility of improving the performance of systems, avoiding electro/optical conversion is explored, by the introduction of optical memories. In particular, a buffering device is presented, in which the optical signal is stored in memory blocks based on the accumulated photon echo phenomenon. The complete operational function is performed using logical gates obtained through nonlinear interaction of spatial beams.

DOI
10.1109/melcon.1998.692355

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The possibility of improving the performance of systems, avoiding electro/optical conversion is explored, by the introduction of optical memories. In particular, a buffering device is presented, in which the optical signal is stored in memory blocks based on the accumulated photon echo phenomenon. The complete operational function is performed using logical gates obtained through nonlinear interaction of spatial beams.
Optical buffers are devices which can store optical signals for a period of time and could be valuable tools for applications such as optical storage, optical packet switching and all-optical signal processing providing the storage functionality in the optical domain, thus avoiding unwanted opto-electronic and eletro-optical conversions. During the last twenty years, there have been proposed many approaches for the implementation of optical buffers. The most straightforward scheme is the use of a fiber spool playing the role of a long-time optical delay line which requires either direct or indirect amplitude modulation to maintain the bit timing [1]. Other interesting techniques referring to optical buffering are slow-light [2], temporal solitons in optical cavities [3], excitability properties of optical devices [4] and photonic crystal nanocavities [5].
Storing and delaying optical information is of crucial importance for optical communications, signal processing and in the quantum domain. A plethora of techniques for optical storage have been shown which aim to maintain as much as possible the advantages of optics, such as e.g. the coherence, the bandwidth and capacity. In particular the interaction of optical waves with mechanical motion offers a solution to buffer optical information [1-4]. It was shown that one can use acoustic waves to store and delay optical signals coherently via the effect of stimulated Brillouin scattering (SBS) [3,4]. This allows for simultaneous storage at multiple wavelengths [5], cascaded storage at different spatial positions [6], and nonreciprocal storage with a GHz bandwidth [7]. However, the delay time of this technique is so far limited to the acoustic lifetime of about 10 ns.