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Optical and Quantum Electronics

Error-corrective optical neural networks modelled by persistent spectral hole-burning

Olavi Ollikainen, Alexander Rebane, Karl K. Rebane

Published Sep 1, 1993• 10 citations
Publisher
DOI
10.1007/bf00444331

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Applied Optics•Apr 10, 1993•1 citation
Persistent spectral hole-burning (PSHB) and its applications in data storage and processing are described. Purely electronic zero-phonon lines having very high peak values in the low temperature impurity spectra of solids are considered. Limitations for very large capacity PSHB memories put by the number of impurity molecules to store one bit are discussed. Doped with impurities optical fiber memory is proposed as a means to have low impurity concentration simultaneously with a large number of the impurities to store one bit. Bit-by-bit (digital) storage is compared to the distributed one and the advantages of the two versions of the latter -- PSHB holography and PSHB modeling of neural networks -- are considered. An experiment of simultaneous read-out over coordinates and frequency in neural network modeling is described. Requirements to PSHB materials and possibilities of the existence of materials effective at high temperatures are discussed.
Brief review of zero-phonon lines, persistent spectral hole burning (PSHB) and its applications is given. The provided by PSHB additional dimension - the spectral one in optical data storage allows in principle to get densities up to 1012 bit cm−2 or 1016 bit cm−3. In both cases an 1016 cm−3 cell comprising on average only 100 impurity molecules is involved to store a bit. It is a two small amount because of fluctuations in the distribution of impurities over the cells. Parallel processing and distributed data storage, realized in PSHB holography and optical modelling of neural networks, are prospective to utilize the full capacity of PSHB storage and processing.