Optical memory for communications switching

After a brief overview of optical resonant filter technology, and three-dimensional waveguide technology, which are key candidates for optical memory, this report discusses potential applications in detail, with a clear indication of the trade-offs involved. We assume that in order to find practical applications, optical memory must be organised into delay-lines. Otherwise, for example, if optical memory elements were connected in parallel, addressing would be an insoluble problem. Finally, we outline how work could proceed – assuming future developments in technology – to develop potentially useful optical switching systems for future communications networks.