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Optics in Computing

Implementing all-optical J-K flip-flops based on a two-phonon scattering of light in a single crystal

Alexandre S. Shcherbakov, E. Tepichin Rodríguez, Arturo Aguirre López

Published Jan 1, 2003• 1 citation
Publisher

Abstract

Theoretical analysis and computer simulations in designing the key components for all-optical J-K flip-flops are presented. These components exploit specially elaborated regime with direct transitions between all the light modes, providing 100% efficiency of operation.
DOI
10.1364/oc.2003.othe7

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We consider physical principles of a two-phonon light scattering in crystals in a special case, when direct transitions between all the orders of scattering are allowed and, moreover, the probabilities of these transitions can be regulated electronically. The exact and closed analytical model for describing this process is presented. The feasibility of exploiting such a phenomenon for creation of an all-optical logic is substantiated. A few possibilities of arranging the optical logic gates are revealed. Fulfilling a set of logic operations is algorithmically analyzed and estimated.
Since there is an increasing demand for fast networks and switches, the electronic data processing imposes a severe bottleneck and all-optical processing techniques will be required in the future. All-optical flip-flops are one of the key components because they can act as temporary memory elements. Several designs have already been demonstrated but they are often relatively slow or complex to fabricate. We demonstrate experimentally fast flip-flop operation in a single DFB laser diode which is one of the standard elements in today's telecommunication industry. Injecting continuous wave light in the laser diode, a bistability is obtained due to the spatial hole burning effect. We can switch between the two states by using pulses with energies below 200 fJ resulting in flip-flop operation with switching times below 75 ps and repetition rates of up to 2 GHz.