Hollow fiber is a revolutionary technology when it comes to high speed trading. It is likely only a matter of years before hollow fiber cables will start to replace standard glass (plastic) fiber networks. This will take us from a speed limit of about 0.7c to approximately 0.997c (and higher if the air in the cable is replaced with helium 0.999965c, or even vacuum).
2015 June: Southampton team claims hollow-core fibre breakthrough Previously record for communication was 2.75 km now 11 km. And hollow fiber could reduce latency by about 30 per cent compared to standard solid-silica optical fibres. In a few years we can likely expect hollow core fibre to be used for high speed trading.
2015 March: Conference Paper: Hollow-Core Fiber for Intra Data Center Low Latency Connectivity with a Commercial 100Gb/s Interface"...demonstrated over the longest manufactured hollow-core fiber (2.75km) to date, proving the feasibility of ultra-low latency intra-data center connectivity."
F. Poletti, N. V. Wheeler, M. N. Petrovich, N. Baddela, E. Numkam Fokoua, J. R. Hayes, D. R. Gray, Z. Li, R. Slavík & D. J. Richardson (2013) “Towards high-capacity fibre-optic communications at the speed of light in vacuum”, Nature Photonics 7, 279–284 “This represents the first experimental demonstration of fibre-based wavelength division multiplexed data transmission at close to (99.7%) the speed of light in vacuum.”
2013 Optics Express: Low-loss hollow-core fibers with improved single-modedness
2013 Wired: Brits Approach (True) Speed of Light Over Fiber Cable
2013 ExtremeTech: DARPA creates hollow-core optical fiber for faster networks, more accurate sensors