The Power of Light

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David N Payne Dedicated to: Guglielmo Marconi and Charles Kao Director ORC University of Southampton 1909 2009 Nobel Laureates in Physics Wireless and optical fibres The power of light GPS systems, synchronous data networks, cell phone telephony, time stamping financial trades Large scale interferometers for telescopes Optical gyroscopes Data centres/computer interconnects Financial traders You can’t beat vacuum for loss, speed of light or stability! The Very Large Telescope Interferometer (VLTI) on Paranal Mountain Data Centre Interconnection Information flow/unit area and latency is key in supercomputers and data centres 20,000 km of fibre per data centre in Facebook alone! Vacuum transit time is 30% lower High-performance: applications in inertial guidance, navigation, platform stabilization, GPS flywheeling, etc. Lower-performance: Consumer / industrial applications in Performancemotion control, industrial limited processing, byconsumer glass electronics, core etc. Periodic lattice of holes Hollow air core Advantage: Typically less than 0.1% optical power in cladding. Ultra-low nonlinearity, lower loss? Vacuum fibre technology Fibres that largely ignore the materials from which they are made Power in glass < 0.01% low nonlinearity Transmission loss < 0.01 dB/m As you wouldLow Latencyexpect (30% from lower) vacuum! Phase insensitive Radiation hard IR transmitting The new anti-resonant fibre 22.3 µm 40.2 µm Width = 359.6 nm 20μm OFC 2016, Los Angeles, PDPTh5A.3 Low Latency data communications • Data transmission at 99.7% the speed of light in vacuum • ‘Only’ 69.4% in a conventional fibre Latency savings (vs conventional fibres): 1m 1.54 ns 100m 154 ns 1km 1.54 µs 100km 154 µs Phase Insensitive Fibres The phase of a signal in a fibre changes with temperature owing to: • Change in refractive index • Change in fibre length • Vacuum fibre temperature sensitivity 2 ps/km/K • 18.5 times smaller than conventional fibres Dr Radan Slavik Slavik et al., Scientific Reports 2015. Dr Eric Numkam .

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