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Proceedings Paper

Selective enhancement/erasure of birefringent interconnections
Author(s): Gajendra D. Savant; Patty Wang; Jay Hirsh; Joanna L. Jannson; Nicholas P. Caviris
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Paper Abstract

Thus far, network modules have mostly been implemented on computers and electronic hardware with low density interconnections at low speed. Optics potentially offers high density parallel interconnections at high speed. However, the implementation has been limited to single layer machines. As a result, no practical implementation has yet been reported. The lack of suitable materials providing dense synaptic interconnections is the primary reason for the slow progress in the practicality of optical neural network implementation. Photorefractives are considered as suitable materials. However, photorefractives have inherent problems including scattering, sensitivity, low refractive index modulation and fast decay. Furthermore, optical network systems based on photorefractives have low signal-to-noise ratio, have poor stability, and cannot realize error driven learning algorithms, such as the back error propagation. In addition, low diffraction efficiency severely affects cascadability of neural layers. Therefore, multilayer machines using photorefractive crystals are difficult to implement. Physical Optics Corporation (POC) has developed a new dynamic birefringent material for recording polarization holograms with selective enhancement or erasure in real time. Extensive investigation has shown that POC's material offers well-controlled dynamic behavior that is superior to photorefractive crystals, Polaroid DMP-128, Du Pont photopolymer and Kodak's silver halide for neural network interconnection applications.

Paper Details

Date Published: 1 May 1992
PDF: 8 pages
Proc. SPIE 1667, Practical Holography VI, (1 May 1992); doi: 10.1117/12.59648
Show Author Affiliations
Gajendra D. Savant, Physical Optics Corp. (United States)
Patty Wang, Physical Optics Corp. (United States)
Jay Hirsh, Physical Optics Corp. (United States)
Joanna L. Jannson, Physical Optics Corp. (United States)
Nicholas P. Caviris, Naval Surface Warfare Ctr. (United States)

Published in SPIE Proceedings Vol. 1667:
Practical Holography VI
Stephen A. Benton, Editor(s)

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