Aspects of phase-conjugation elements in analog/digital parallel computing networks

Theo T. Tschudi; Cornelia Denz; Torsten Kobialka

doi:10.1117/12.22134

1 July 1990 Aspects of phase-conjugating elements in analog/digital parallel computing networks

Theo T. Tschudi, Cornelia Denz, Torsten Kobialka

Proceedings Volume 1319, Optics in Complex Systems; (1990) https://doi.org/10.1117/12.22134
Event: 15th International Optics in Complex Systems, 1990, Garmisch, Germany

Abstract

The possibility to compensate losses and aberrations in optical networks by means of phaseconjugating elements will be illustrated on the example of an active multichannel feedback system. Phase conjugating elements can be used for the compensation of aberrations and losses in optical systems. The realization of new optical transmitting and processing systems by using PC elements for several purposes - like e. g. multichannel optical operational amplifiers delay lines computing and neural networks - is possible. In particular optical feedback systems show interesting properties for applications in this field. The implementation of nonlinear and active elements e. g. optical image amplifiers results in a wide variety of achievable transfer functions. In this paper we present a coherent optical feedback system which is capable to process a large number of channels entirely in parallel. The system consists of a ring-resonator with a phase-conjugating mirror (PCM) as an image amplifier. The aberration compensating property of optical phaseconjugation allows us to realize a feedback system with space-bandwidth product up to iO which would hardly be achievable otherwise. In addition optical resonators employing PCM''s show spatial and temporal properties different from conventional resonators. The key element is a photorefractive BaTiO3 crystal in a degenerated fourwave mixing scheme. The 6. 3x2. 4x3. 6 mm crystal with the optical axis parallel to the long edge is operating at room temperature and without any applied electrical field. An

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Theo T. Tschudi, Cornelia Denz, and Torsten Kobialka "Aspects of phase-conjugating elements in analog/digital parallel computing networks", Proc. SPIE 1319, Optics in Complex Systems, (1 July 1990); https://doi.org/10.1117/12.22134

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