Fast optical thresholding with an array of optoelectronic transceiver elements

Buczyński, Ryszard; Baukens, Valerie; Szoplik, Tomasz; Goulet, Alain; Debaes, Nathalie; Kirk, Andrew G.; Heremans, Paul; Vounckx, Roger; Veretennicoff, Irina; Thienpont, Hugo

doi:10.1109/68.748238

Cited by 14 publications

(2 citation statements)

References 8 publications

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“…In this paper we summarize results obtained in a dual-rail morphological processor composed of arrays of transceiver elements combined in differential pairs [12][13][14][15]. Its unique property of fast switching between binary states results from its comparator regime of operation and winner-take-all rule that governs performance of coupled devices.…”

Section: Introductionmentioning

confidence: 99%

Optical implementations of threshold decomposition and morphological operations with dual-rail processing

2004

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Fast parallel processing of gray-scale images and exact hard-clip thresholding are two important functionalities necessary in optoelectronic implementations of structural processors. The parallel nature of processing stems from optical implementation of local operations with arrays of active smart pixels. We have demonstrated a morphological image processor composed of arrays of bistable optoelectronic transceivers which are connected in differential pairs and work as comparators. The use of differential pairs of optical thyristors fabricated in GaAs technology allows to realize a dual rail architecture for this photonic morphological image processor. The processor consists of a thresholding module and a binary morphological processing module. The thresholding module decomposes gray level images into series of binary slices. In the binary morphological processing module operations are performed within a neighborhood defined by a structuring element implemented as a diffractive fan-out element. In the prototype set-up we demonstrate median filtering, dilation and erosion operations performed for an image of 8x8 pixels and threshold decomposition of 6 gray level images. In principle all rank order as well as morphological filters can be optically calculated in the set-up. Additional functionality of the processor is achieved with use of the electronic layer with digital cellular processors. The electronic layer, designed as an array of simple digital processors, realizes a set of operations on binary images using 4 bit programmable weights. Simulation results for 0.8 µm CMOS technology are presented. We discuss the limitations of the photonic morphological image processing with respect to bandwidth, parallelism and architecture of the processor.

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Section: Introductionmentioning

confidence: 99%

Optical implementations of threshold decomposition and morphological operations with dual-rail processing

2004

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“…In this paper we take a closer look at two of these configurations. We first focus on the 3-D scheme because it has been widely adopted in the paradigm of dedicated opto-electronic accelerators based on smart-pixel technology, such as earlyvision and morphological processors, and also because it has recently been proposed to optically interconnect MCM modules [4,7,8]. The Optics in Computing community however considers this 3-D approach to be a mid-term rather than a short-term solution, for it requires revolutionary rather than evolutionary changes in packaging technologies before it can become a low-cost, compact and practical approach.…”

Section: Introductionmentioning

confidence: 99%

Free-space optical interconnection modules for 2D photonic-VLSI circuitry based on microlenses and GRINs

et al. 2000

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In this paper we present different configurations for a compact free-space optical interconnection (FSOI) module by combining two radial gradient refractive index lenses (GRIN) and/or two arrays of refractive microlenses. Based on our findings with ray-tracing and radiometric analysis we discuss how we have selected the proper optical system configurations and how we have chosen the different design parameters to optimally accommodate different types of opto-electronic emitters such as LEDs, micro-cavity LEDs and VCSELs. We hereby focused on maximizing optical coupling efficiencies and misalignment tolerances while minimizing inter-channel cross-talk. Furthermore we discuss the experimental optical characteristics of two such prototype modules that we completed together with the first experimental results of their use in parallel data communication demonstrator systems.

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Spatial current-density instabilities in multilayered semiconductor structures

Gorbatyuk¹,

Niedernostheide

2002

Phys. Rev. B

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Fast optical thresholding with an array of optoelectronic transceiver elements

Cited by 14 publications

References 8 publications

Optical implementations of threshold decomposition and morphological operations with dual-rail processing

Optical implementations of threshold decomposition and morphological operations with dual-rail processing

Free-space optical interconnection modules for 2D photonic-VLSI circuitry based on microlenses and GRINs

Spatial current-density instabilities in multilayered semiconductor structures

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