Fibre research shows promise for ultra-stable applications

December 10, 2015, National Physical Laboratory
Fibre research shows promise for ultra-stable applications
Dr Eric Numkam-Fokoua inspects a hollow-core optical fibre preform. Credit: University of Southampton

A team from the National Physical Laboratory (NPL) and the University of Southampton has published research into the development of an advanced fibre with zero-sensitivity to temperature changes.

Published in Scientific Reports, the paper, "Ultralow thermal of phase and propagation delay in hollow core optical fibres," reveals key developments in optical signal propagation time and frequency characteristics.

The research has been conducted by a team from the Coherent Optical Signals and Microstructured Fibre groups of Southampton's Optoelectronics Research Centre (ORC), in collaboration with the Time & Frequency Group at NPL. It explores the development of a robust hollow core fibre suitable for use in demanding , such as the distribution of accurate time signals, that are very sensitive to environmental variation, for example to changes in .

Propagation time through an optical fibre changes with the environmental conditions occurring where the fibre is laid, since changes in the temperature alter both the fibre length (by a tiny but still significant fraction) and the refractive index associated with the silica glass at its core. These changes have a negligible impact for most fibre applications such as telecommunications, however, they can be greatly detrimental in many others such as fibre-based interferometric experiments and devices.

The paper shows that hollow core photonic bandgap fibres have a significantly smaller sensitivity to temperature variations than traditional solid core fibres. The researchers observed a reduction in thermal sensitivity by a factor of 18, making these fibres the most environmentally-insensitive fibre technology available to date.

Dr Giuseppe Marra, of NPL, said: "Optical fibres are playing an increasingly important role in state-of-the-art frequency metrology: from fibre-based devices in the laboratory to the international comparison of optical clocks between National Metrology Institutes. However, in all these ultra-stable applications, the fibre sensitivity to is a major concern. The fibre developed at the ORC is opening a whole range of new possibilities."

Dr Radan Slavik, of the University of Southampton, said: "This represents a new and quite exciting research direction for my team. Optical fibre is a great medium for guiding light, but there are still aspects of its performance that are far from ideal with current fibre technology. One of them is its large temperature sensitivity - addressing this issue opens up a whole range of scientifically interesting and industrially relevant applications."

Radan explains: "These fibres are promising candidates for many next-generation fibre system applications that are sensitive to drifts in optical phase or absolute propagation delay. The combination of their unique properties makes the fibres attractive for a range of applications, including gyroscopes, fibre interferometers and the delivery of precise synchronisation signals."

Explore further: Researchers to test new optical fibre 3-D printing technique

More information: Radan Slavík et al. Ultralow thermal sensitivity of phase and propagation delay in hollow core optical fibres, Scientific Reports (2015). DOI: 10.1038/srep15447

Related Stories

Super-sharp images through thin optical fibres

February 1, 2016

Super-sharp images from within the human body made through tiny endoscopes have come a step closer to reality thanks to joint research by scientists from the University of Twente's MESA+ research institute, the Max Planck ...

Hollow optical fibers for UV light

July 2, 2014

(Physikalisch-Technische Bundesanstalt (PTB)) Researchers from the Max Planck Institute for the Science of Light in Erlangen/Germany and of the QUEST Institute, based at the Physikalisch-Technische Bundesanstalt, have tested ...

Recommended for you

Trembling aspen leaves could save future Mars rovers

March 18, 2019

Researchers at the University of Warwick have been inspired by the unique movement of trembling aspen leaves, to devise an energy harvesting mechanism that could power weather sensors in hostile environments and could even ...

Quantum sensing method measures minuscule magnetic fields

March 15, 2019

A new way of measuring atomic-scale magnetic fields with great precision, not only up and down but sideways as well, has been developed by researchers at MIT. The new tool could be useful in applications as diverse as mapping ...

Researchers report new light-activated micro pump

March 11, 2019

Even the smallest mechanical pumps have limitations, from the complex microfabrication techniques required to make them to the fact that there are limits on how small they can be. Researchers have announced a potential solution—a ...

0 comments

Please sign in to add a comment. Registration is free, and takes less than a minute. Read more

Click here to reset your password.
Sign in to get notified via email when new comments are made.