A multi-wavelength optical content-addressable parallel processor (MW-OCAPP) for high-speed relational database processing: Free-space experimental implementation and monolithic adaptation based on guided-wave technology

This thesis explores the five-space experimental implementation and monolithic adaptation of the Equality subsystem from a parallel relational database optical machine called the Multi-Wavelength Optical Content-Addressable Parallel Processor (MW-OCAPP). MW-OCAPP uses a novel polarization- and wavelength-encoding scheme to achieve an input/output-limited experimental peak bit comparison rate of 96,000/sec. Recognizing the severe diffraction-limit penalty for using a free-space optical processor with relatively long path lengths, a system based on guided-wave optics called the Equivalency Processing Parallel Photonic Integrated Circuit (EP3IC) was developed. Although algorithmically identical to MW-OCAPP's equality operation, EP3IC's peak bit comparison rate for a similarly configured machine is over six orders of magnitude faster. It achieves this substantial performance advantage by making use of integrated high-speed detectors and electro-optic modulators. This integrated circuit solution provides relatively low-power operation, fast switching speed, a compact system footprint, vibration tolerance, and a design that is highly manufacturable