Three members of the faculty at Stevens Institute of Technology recently collaborated on a paper focusing on free-space optical communication, which appears in the latest issue of Optics Express, a premiere optics journal currently in circulation.
Dr. Paul Corrigan, a research associate at the MIRTHE Foundation and a Visiting Assistant Professor at Stevens, working along with Stevens Associate Professor Rainer Martini and Professor Edward Whittaker, spent months researching and writing the study as part of their free-space optics test-bed established in the Physics Department at Stevens.
Free-space optical communication is line-of-sight laser communication through the air. To date, the primary barrier to commercial uptake of this technology has been the limitations imposed by adverse weather, particularly fog, which restricts conventional near-infrared laser systems throughput in the air. The quantum cascade laser (QCL) provides key optical emission wavelengths in the mid-infrared that are thought to overcome many of these problems and thereby increase communication robustness, data security and deployable range.
However, in the optics community there has been a debate as to whether a mid-infrared source really is a better physical layer solution than near-infrared light. Much of the debate hinged on the shortage of good data that compares systems side-by-side in a fair way.
At Stevens, the free-space optics group created a world leading multi-wavelength test bed with "off-the-shelf" telecom systems and QCLs. They found that in adverse conditions such as haze, fog and rain, a mid-infrared QCL system truly is stronger, delivering up to 300% greater throughput than conventional systems.
What makes the paper special is that the professors also present the first experimental evidence – to their knowledge – of a unique atmospheric effect called "scavenging," where the composition of fog changes with respect to QCL light in a previously unmeasured way due to the presence of rain.
"The application of this study extends not only to industrial development of free-space optical systems for fast high bandwidth deployment, but also to military applications in targeting, as well as possibly to understanding the formation and lifetime of fog, something that has not been very well understood up to now," said Dr. Corrigan.
Patrick A. Berzinski | EurekAlert!
Further reports about: > Optic > QCL > Venus Express > communication robustness > computer science > conventional near-infrared laser systems > data security > deployable range > free-space optical communication > free-space optics > key optical emission wavelengths > mid-infrared source > near-infrared light > optical communication > quantum cascade laser > unique atmospheric effect
Nanostructures taste the rainbow
29.06.2017 | California Institute of Technology
X-ray photoelectron spectroscopy under real ambient pressure conditions
28.06.2017 | National Institutes of Natural Sciences
Computer scientists use wave packet theory to develop realistic, detailed water wave simulations in real time. Their results will be presented at this year’s SIGGRAPH conference.
Think about the last time you were at a lake, river, or the ocean. Remember the ripples of the water, the waves crashing against the rocks, the wake following...
An international team of scientists has proposed a new multi-disciplinary approach in which an array of new technologies will allow us to map biodiversity and the risks that wildlife is facing at the scale of whole landscapes. The findings are published in Nature Ecology and Evolution. This international research is led by the Kunming Institute of Zoology from China, University of East Anglia, University of Leicester and the Leibniz Institute for Zoo and Wildlife Research.
Using a combination of satellite and ground data, the team proposes that it is now possible to map biodiversity with an accuracy that has not been previously...
Heatwaves in the Arctic, longer periods of vegetation in Europe, severe floods in West Africa – starting in 2021, scientists want to explore the emissions of the greenhouse gas methane with the German-French satellite MERLIN. This is made possible by a new robust laser system of the Fraunhofer Institute for Laser Technology ILT in Aachen, which achieves unprecedented measurement accuracy.
Methane is primarily the result of the decomposition of organic matter. The gas has a 25 times greater warming potential than carbon dioxide, but is not as...
Hydrogen is regarded as the energy source of the future: It is produced with solar power and can be used to generate heat and electricity in fuel cells. Empa researchers have now succeeded in decoding the movement of hydrogen ions in crystals – a key step towards more efficient energy conversion in the hydrogen industry of tomorrow.
As charge carriers, electrons and ions play the leading role in electrochemical energy storage devices and converters such as batteries and fuel cells. Proton...
Scientists from the Excellence Cluster Universe at the Ludwig-Maximilians-Universität Munich have establised "Cosmowebportal", a unique data centre for cosmological simulations located at the Leibniz Supercomputing Centre (LRZ) of the Bavarian Academy of Sciences. The complete results of a series of large hydrodynamical cosmological simulations are available, with data volumes typically exceeding several hundred terabytes. Scientists worldwide can interactively explore these complex simulations via a web interface and directly access the results.
With current telescopes, scientists can observe our Universe’s galaxies and galaxy clusters and their distribution along an invisible cosmic web. From the...
19.06.2017 | Event News
13.06.2017 | Event News
13.06.2017 | Event News
29.06.2017 | Physics and Astronomy
29.06.2017 | Life Sciences
29.06.2017 | Health and Medicine