Optical waveguide type synaptic weight modulator with nematic liquid crystal cladding
First Claim
1. An optical waveguide type synaptic weight modulator for use with a control power supply, comprising:
- a glass substrate;
a multichannel waveguide provided on the glass substrate, the waveguide having an input portion with a plurality of channel waveguides, an output portion, and a branching portion which connects the input and output portions; and
weighting means for weighting input signals which have different waveguide modes and which are introduced into the input portion of the waveguide so as to generate a weighted output signal at the output portion of the waveguide, the weighting means includingelectrodes provided on the glass substrate, the channel waveguides passing between the electrodes, the electrodes being connected to the control power supply,a nematic liquid crystal cladding layer provided over the channel waveguides and the electrodes, andan orientation film contacting the nematic liquid crystal cladding layer.
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Abstract
The present invention relates to an optical waveguide type synaptic weight modulator with a nematic liquid crystal cladding layer. The modulator can be used for optronics and optical neural computing. The modulator includes a multichannel waveguide provided on a glass substrate, electrodes which are provided on the glass substrate and which sandwich the channels of the waveguide, a nematic liquid crystal cladding layer provided perpendicularly to the waveguide and electrodes, a control power supply connected to the electrodes, a light source prism coupled to the waveguide, and a multimode fiber end surface coupling an output of the waveguide to a photomultiplier. The nematic liquid crystal cladding layer provides an electrooptical effect and is fixed by an orientation film. Weights are added to each signal in the same manner as the synaptic action of a neural circuit by controlling the power distribution of an input signal consisting of a combination of different waveguide modes by an electric deflection effect with respect to a liquid crystal molecular direction.
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Citations
4 Claims
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1. An optical waveguide type synaptic weight modulator for use with a control power supply, comprising:
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a glass substrate; a multichannel waveguide provided on the glass substrate, the waveguide having an input portion with a plurality of channel waveguides, an output portion, and a branching portion which connects the input and output portions; and weighting means for weighting input signals which have different waveguide modes and which are introduced into the input portion of the waveguide so as to generate a weighted output signal at the output portion of the waveguide, the weighting means including electrodes provided on the glass substrate, the channel waveguides passing between the electrodes, the electrodes being connected to the control power supply, a nematic liquid crystal cladding layer provided over the channel waveguides and the electrodes, and an orientation film contacting the nematic liquid crystal cladding layer. - View Dependent Claims (2, 3, 4)
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Specification