Dimethyl sulfide (DMS) is one kind of volatile sulfur compounds (VSCs) possessing disagreeable odor, with a low olfactory threshold around 20 ppb. Highly sensitive detection of DMS at room temperature (RT) is critical...
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An optoelectronic model of discrete time cellular neural networks (DTCNN) is presented. Connections between cells and parallel input-output are realized using optoelectronic devices. As an emitter-receiver device an o...
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An optoelectronic model of discrete time cellular neural networks (DTCNN) is presented. Connections between cells and parallel input-output are realized using optoelectronic devices. As an emitter-receiver device an optical thyristor is applied. Connections between cells are realized by diffractive Damman gratings. We propose a dual rail system for early processing of binary images. The CNN system performs mathematical morphology and space logic operations.
An analytical model for the pressure and strain sensitivity of birefringent fibres is proposed in agreement with numerical calculations. Results of polarimetry and coherence-multiplexing are presented together with a ...
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To provide parallel optical data input to optical information processing systems a choice must be made between highly parallel modulator arrays and (currently) moderately parallel arrays of active sources. Two technol...
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To provide parallel optical data input to optical information processing systems a choice must be made between highly parallel modulator arrays and (currently) moderately parallel arrays of active sources. Two technologies are compared for suitability to address arrays of differential pairs of PnpN optical thyristors; these are liquid crystal display devices (LCDs) and vertical cavity surface emitting lasers (VCSELs). An 8/spl times/8 array of thyristor pairs is addressed optically with a LCD and a single thyristor pair is driven with a VCSEL pair. The trade-offs between speed and parallelism are considered in each case and desirable properties for future devices are determined.
Recently a very promising active bistable vertical-to-surface transition electrophotonic device was developed to perform chip-to-chip optical interconnects—the PnpN photothyristors (Fig. 1). When used in the configur...
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Recently a very promising active bistable vertical-to-surface transition electrophotonic device was developed to perform chip-to-chip optical interconnects—the PnpN photothyristors (Fig. 1). When used in the configuration of a differential pair, these multilayer III-V semiconductor (GaAs/AlGaAs) structures are capable of emitting a binary optical signal, when receiving a 250 fj optical input and controlled by a voltage cycle with period less than 70 ns.1
Among the most promising elements for digital parallel optical information processing are differential pairs of PnpN optical thyristors. We have shown very recently that these optical detector-generator type of device...
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Among the most promising elements for digital parallel optical information processing are differential pairs of PnpN optical thyristors. We have shown very recently that these optical detector-generator type of devices can be switched-on in very short times (typical 10 ns) with very low switching energies (typical 40 fj of absorbed optical energy), while the problem of slow switch-off times, causing unpractical cycle times, was tackled using a double-heterojunction structure that can be completely depleted by means of a simple negative anode-to-cathode low voltage pulse. In this way PnpN thyristors with switch-off times of 10 ns became available.1
In this paper we report on the progress which has been made in the fabrication and use of 2-D optical logic planes consisting of silicon hybrid electrically assisted thermo-optic resonators (HEATORS).1
In this paper we report on the progress which has been made in the fabrication and use of 2-D optical logic planes consisting of silicon hybrid electrically assisted thermo-optic resonators (HEATORS).1
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