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Quantum Electronics

Circulatory fibre-optic memory loop with a built-in service channel

Vladimir A. Pilipovich, Alexander K. Esman, Игорь Андреевич Гончаренко, Valery S. Posedko, Ivan F. Solonovich

Published Oct 31, 1995• 1 citation
Publisher

Abstract

A method for increasing the information capacity and enhancing the reliability of information storage in a dynamic fibre-optic memory is proposed. An additional built-in channel with counterpropagating circulation of signals is provided for this purpose. This additional channel can be used to transmit both information and service signals, such as address words, clock signals, correcting sequences, etc. The possibility of compensating the attenuation of an information signal by stimulated Raman scattering is considered.

DOI
10.1070/qe1995v025n10abeh000515

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A method for increasing the information capacity and enhancing the reliability of information storage in a dynamic fibre-optic memory is proposed. An additional built-in channel with counterpropagating circulation of signals is provided for this purpose. This additional channel can be used to transmit both information and service signals, such as address words, clock signals, correcting sequences, etc. The possibility of compensating the attenuation of an information signal by stimulated Raman scattering is considered.
The method of enhancing the information capacity and reliable storage of information in circulator fiber-optic memory is presented. The method is based on creation of an additional built-in channel with contrary-directed circulation of signals. This channel can be used for transmission of both information and auxiliary signals: address words, clock signals, correcting sequences, etc. The possibility of compensating the information signal losses by means of stimulated Raman scattering is considered.
The feasibility of constructing an all-optical dynamic memory based on stimulated Raman scattering (SRS) in a fibre waveguide is discussed. A possible use of an SRS inverter for regeneration of optical signals is considered. Theoretical and experimental investigations are reported of the functional properties of an SRS inverter. The construction and investigation of a prototype all-optical fibre memory with an SRS inverter are described. The repetition frequency of the optical pulses along a fibre loop is 100 MHz and the loop capacity is 500 bits. Pulse circulation is reported over a period of 10 min at an average pump power of 2 W. The response time and the energy requirements of devices with an SRS inverter, and ways of improving their characteristics are considered.
The possibility of providing long-term storage of a binary sequence of pulses circulating in a fiber loop is discussed. The regeneration of the sequence is achieved by a fiber logic gate based on stimulated Raman scattering. Estimations show that a possible pulse repetition rate of 1010 Hz for the stimulated-Raman-scattering gate operation can be expected for an average pump power of 1 W. The circulation of the binary sequence of 100-ps pulses was observed during 10 min in a loop 870 m long. It corresponds to more than 106 round trips around the loop.
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.