N x N optical crossbar switches provide photonic switching networks with non-blocking programmable interconnections that have a channel bandwidth compatible with optical fibers. These switches have been realized in two basic forms: integrated-optic and free-space optical crossbars [l-21. Processing of information to set-up It is expected that optical interconnection networks will be required to...

In this paper we investigate the application of CDMA in optical communication networks. Optical fiber based communication systems has advantage of having access to large bandwidth and ultra–high speed signal processing are possible. Optical code division multiple access (O-CDMA) is evolving into a promising candidate for access networks, due to its potential for enhanced information security, s...

Early cognitive vision is one of the most important perceptive functions in the mammalian cerebral cortex. During information processing in the visual cortex, many bioelectrical signals are exchanged between cortical neurons, across their synaptic interconnections. When modelling visual cortex processing a dynamic scene can be modelled as an optical flow field, which can, in turn, be mapped on ...

By optimum combination of optical pre-processing and digital post-processing, or optical coding and digital decoding of the image information, incoherent optical systems invariant to numerous aberrations can be formed. The theory of aberration invariance can also be used with low-cost, low-precision optics to produce systems that image with the performance of high-cost, high-precision, or near ...

An important issue pertaining to the retro-conversion of newspapers, i.e. the conversion of newspaper issues into digital resources, is the identification and appropriate digital representation of an article. To complete this task, a number of steps have to be followed, from segmentation of the newspaper image to optical character recognition and linking of different items belonging to the same...

The instantaneous response time of parametric optical nonlinearities enable real-time processing of, and interaction between, spatial and temporal optical waveforms. We review the various signal-processing alternatives based on threeand fourwave-mixing arrangements among spatial and temporal information carrying waveforms. The fast response time of the interaction permits information exchange b...

We approach nanophotonic computing on the basis of optical near-field interactions between quantum dots. A table lookup, or matrix-vector multiplication, architecture is proposed. As fundamental functionality, a data summation mechanism and digital-to-analog conversion are experimentally demonstrated using CuCl quantum dots. Owing to the diffraction-limit-free nature of nanophotonics, these arc...