The breakthrough enables a reach increase for optical fiber signals from e.g. 1000 km to 4000 km, paving way for increasing the capacity of data communications. The new amplifier could lead to better Internet traffic and laser radar technology, and promote any applications where detection of very weak levels of light is essential, such as free-space communication.
The researchers at Chalmers University of Technology have, by using a so-called phase-sensitive fiber-optic parametric amplifier, PSA, reduced the noise figure to 1 dB. In traditional erbium-doped fiber amplifiers the noise figure is 3 dB at best, resulting in loss of signal integrity. 1 dB is the lowest noise ever reported in any kind of amplifier with reasonably large signal gain. This represents a breakthrough also because it is implemented in a practical way, making it potentially very attractive in various applications – most notably in high capacity optical communication systems.
“This is the ultimate optical amplifier. It enables connecting cities, countries and continents more efficiently by placing the amplification hubs at much greater intervals. The signal can also be modulated more effectively. In addition, the amplifier is compatible with any modulation format, with traditional laser transmitters and can be very broadband, making it compatible with many lasers at different wavelengths”, says Professor Peter Andrekson, who has developed the low-noise amplifier together with his research group in fiber optics.
The group has taken advantage of the fact that the refractive index of glass is not constant, but dependent on light intensity in the fiber. The new amplifier shows experimentally to have 1 dB noise level, with a theoretical minimum of 0 dB, i.e. no noise being added in the amplification process. The next step for the Chalmers researchers are towards applications.
“The entire optical telecom industry is our market. But the technology is generic, and scalable to other wavelengths like visible or infrared light, which makes it attractive in areas such as measurements, spectroscopy, laser radar technology and any applications where detection of very weak levels of light is essential”, says Peter Andrekson.
The research is performed at Chalmers University of Technology. It is funded by the European project PHASORS and the Swedish Research Council (VR). Participating partners in the EU project includes University of Southampton, University College Cork, University of Athens, Eblana, OFS, OneFive Photonics and EXFO Sweden AB. The results were published in Nature Photonics.The article:
Christian Borg | idw
Deep Learning predicts hematopoietic stem cell development
21.02.2017 | Helmholtz Zentrum München - Deutsches Forschungszentrum für Gesundheit und Umwelt
Sensors embedded in sports equipment could provide real-time analytics to your smartphone
16.02.2017 | University of Illinois College of Engineering
In the field of nanoscience, an international team of physicists with participants from Konstanz has achieved a breakthrough in understanding heat transport
Cells need to repair damaged DNA in our genes to prevent the development of cancer and other diseases. Our cells therefore activate and send “repair-proteins”...
The Fraunhofer IWS Dresden and Technische Universität Dresden inaugurated their jointly operated Center for Additive Manufacturing Dresden (AMCD) with a festive ceremony on February 7, 2017. Scientists from various disciplines perform research on materials, additive manufacturing processes and innovative technologies, which build up components in a layer by layer process. This technology opens up new horizons for component design and combinations of functions. For example during fabrication, electrical conductors and sensors are already able to be additively manufactured into components. They provide information about stress conditions of a product during operation.
The 3D-printing technology, or additive manufacturing as it is often called, has long made the step out of scientific research laboratories into industrial...
Nature does amazing things with limited design materials. Grass, for example, can support its own weight, resist strong wind loads, and recover after being...
Nanometer-scale magnetic perforated grids could create new possibilities for computing. Together with international colleagues, scientists from the Helmholtz Zentrum Dresden-Rossendorf (HZDR) have shown how a cobalt grid can be reliably programmed at room temperature. In addition they discovered that for every hole ("antidot") three magnetic states can be configured. The results have been published in the journal "Scientific Reports".
Physicist Dr. Rantej Bali from the HZDR, together with scientists from Singapore and Australia, designed a special grid structure in a thin layer of cobalt in...
13.02.2017 | Event News
10.02.2017 | Event News
09.02.2017 | Event News
24.02.2017 | Life Sciences
24.02.2017 | Life Sciences
24.02.2017 | Trade Fair News