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Code: EP120

Description

This lecture moves interconnect to the system level, reemphasising the solution to the electronic bottleneck. The advantage of wavelength multiplexing is seen to add a third degree of freedom (to space and time). Photonics transparency enables Routeing, speed enables Processing applications, and connectivity is achieved through Guided Waves, Free Space and Pseudo Free Space. An option is presented for a multidimensional switching architecture. An experimental arrangement of an Optical Time Multiplexed Network is also presented, and the data structure for time multiplexing on a 620 Mbit/s link illustrated. Calculations show how bit error rates can be improved for different guard band configurations. Passive photonic interconnection technologies are related to transmission distance in a chart, e.g., multifibre ribbon interconnects range from 1-10 metres, fibre/connector backplane systems range from 0.1 - 10 metres, and so on. The lecturer then goes on to consider whether free space is the ultimate interconnection, showing that a density of interconnection of 104 interconnections per mm2 can be achieved before hitting the diffraction limit for free space. Thus system interconnection can use free space as the interconnection medium.