Feeds

Want faster fibre? Get rid of the glass

Hollow fibre propagates optics near speed of light

Eight steps to building an HP BladeSystem

One of the most irritating expressions people can use, “broadband at the speed of light”, is a little closer to coming true thanks to researchers from the University of Southampton, who have demonstrated air-filled fibres with propagation happening at 99.7 percent of c.

In a conventional fibre, the glass acts as a waveguide: the core and its cladding have different refractive indices, which means the optical signal follows the path you want. In the solid core, light can only propagate at roughly 70 percent of the speed of light in a vacuum.

Through air, light moves more quickly, so there's been a long-running thread in research to do just that: propagate the light through air, and use the fibre to confine it – rather like metal waveguides are used to guide microwave-frequency signals.

This has been known for ages, and a search turns up years of research into air waveguides for optical signals. What the University of Southampton researchers are claiming (abstract) in Nature Photonics is to have solved the problems of loss and coupling that the air solution encounters.

By getting propagation speed up to 99.7 percent from 70 percent of light-speed, the best-case trip from Australia to the US would be cut from about 43 milliseconds to about 30 milliseconds (ignoring router hops and regeneration). In the world of long-distance communications, the lower latency would be beloved of gamers, and also in the world of high-speed financial trading.

The researchers also note that success with air-filled fibre would be of benefit “inside the box” – for example, to help ship data between elements in supercomputers (since electricity can only limp through copper at about two-thirds light-speed).

They claim to have achieved 3.5 dB per kilometre loss, and the 160nm wide channel was enough to carry were able to send 37 WDM channels at 40 Gbps each. ®

The Power of One Brief: Top reasons to choose HP BladeSystem

More from The Register

next story
GoTenna: How does this 'magic' work?
An ideal product if you believe the Earth is flat
Google Nest, ARM, Samsung pull out Thread to strangle ZigBee
But there's a flaw in Google's IP-based IoT system
Orange spent weekend spamming customers with TXTs
Zero, not infinity, is the Magic Number customers want
US freemium mobile network eyes up Europe
FreedomPop touts 'free' calls, texts and data
Want to beat Verizon's slow Netflix? Get a VPN
Exec finds stream speed climbs when smuggled out
'Two-speed internet' storm turns FCC.gov into zero-speed website
Deadline for comments on net neutrality shake-up extended to Friday
NBN Co execs: No FTTN product until 2015
Faster? Not yet. Cheaper? No data
prev story

Whitepapers

Reducing security risks from open source software
Follow a few strategies and your organization can gain the full benefits of open source and the cloud without compromising the security of your applications.
Consolidation: The Foundation for IT Business Transformation
In this whitepaper learn how effective consolidation of IT and business resources can enable multiple, meaningful business benefits.
Application security programs and practises
Follow a few strategies and your organization can gain the full benefits of open source and the cloud without compromising the security of your applications.
Boost IT visibility and business value
How building a great service catalog relieves pressure points and demonstrates the value of IT service management.
Consolidation: the foundation for IT and business transformation
In this whitepaper learn how effective consolidation of IT and business resources can enable multiple, meaningful business benefits.