VCSEL operational requirements for optoelectronic neural networks

Andrew J. Waddie; Mohammad R. Taghizadeh

doi:10.1117/12.468393

15 April 2003 VCSEL operational requirements for optoelectronic neural networks

Andrew J. Waddie, Mohammad R. Taghizadeh

Author Affiliations +

Proceedings Volume 4942, VCSELs and Optical Interconnects; (2003) https://doi.org/10.1117/12.468393
Event: Photonics Fabrication Europe, 2002, Bruges, Belgium

Abstract

In this paper we shall describe the design and successful operation of an optoelectronic Hopfield network demonstrator system. This demonstrator system, based around a free-space diffractive optical interconnect, was designed to perform a range of optimisation tasks, in particular those associated with the scheduling of packets through different switching topologies. Experimental optimisation of the neural network throughput, for both a crossbar and Banyan switch topology, allows the neural network parameters (e.g. neuron bias, neuron weighting) to be tuned to ensure optimal operation of the network for a particular switch topology. The weighted interconnections in this optoelectronic system are provided by a diffractive optical element/lens combination whilst the neurons are implemented electronically. The transition between the electronic and optical domains is handled by an 8×8 VCSEL array for the electronic-optic interface, and an 8×8 Si photodetector array for the optic-electronic interface. The VCSEL array, supplied by Avalon Photonics, is an oxide-confined near-infrared GaAs device capable of 250MHz modulation at a wavelength of 960nm. The diffractive optical interconnect is designed using simulated annealing optimization and fabricated using VLSI photolithography. Using these techniques it is possible to create interconnects with a total efficiency of ~70% and a uniformity of < 1%.

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Andrew J. Waddie and Mohammad R. Taghizadeh "VCSEL operational requirements for optoelectronic neural networks", Proc. SPIE 4942, VCSELs and Optical Interconnects, (15 April 2003); https://doi.org/10.1117/12.468393

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