From Chalmers University of Technology [tekniska högskola](SE): “Compact amplifier could revolutionise optical communication” 

From Chalmers University of Technology [tekniska högskola](SE)

Sep 21, 2021
Ping Zhao, Postdoc
Photonics Laboratory at Chalmers
Department of Microtechnology and Nanoscience
Chalmers University of Technology
pingz@chalmers.se

Peter Andrekson, Professor
Head of the Photonics Laboratory
Department of Microtechnology and Nanoscience
Chalmers University of Technology,
+46 31 772 16 06,
peter.andrekson@chalmers.se

Mia Halleröd Palmgren
Press Officer
+46-31-772 3252
mia.hallerodpalmgren@chalmers.se

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Researchers at Chalmers University of Technology, Sweden, present a unique optical amplifier that is expected to revolutionise both space and fiber communication. The new amplifier offers high performance, is compact enough to integrate into a chip just millimeters in size, and – crucially – does not generate excess noise.

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Henrik Sandsjö/Chalmers University of Technology.
Professor Peter Andrekson is Head of the Photonics Laboratory at the Department of Microtechnology and Nanoscience, Chalmers University of Technology, Sweden.

Researchers at Chalmers University of Technology, Sweden, present a unique optical amplifier that is expected to revolutionise both space and fiber communication. The new amplifier offers high performance, is compact enough to integrate into a chip just millimeters in size, and – crucially – does not generate excess noise.

“This could be compared to switching from older, dial-up internet to modern broadband, with high speed and quality,” says Professor Peter Andrekson, Head of the Photonics Laboratory at the Department of Microtechnology and Nanoscience at Chalmers. Optical communication makes it possible to send information over very long distances. The technology is useful in a range of applications, such as space communication and in fiber optic cables for internet traffic.

With communication based on light, rather than radio waves, we could, for example, quickly send high-resolution images from Mars. The information, carried by laser beams, could be sent with high speed from a transmitter on the planet to a receiver on Earth or on the Moon. Optical communication also allows us to use the internet around the world – whether the signal is transferred in optical fiber cables under the seabed or transmitted wirelessly.

Because the light – carrying the information between two distant points – loses power along the way, a large number of optical amplifiers are needed. Without amplifiers, up to 99 percent of the signal in an optical fiber cable would disappear within 100 kilometers.

A constant battle against excess noise

A well-known problem in optical communication, however, is that these amplifiers add excess noise that significantly impairs the quality of the signal you want to send or receive. Now, the Chalmers researchers present an extremely promising solution to an obstacle that has existed for decades.

“We have developed the world’s first optical amplifier that significantly enhances the range, sensitivity and performance of optical communication, that does not generate any excess noise – and is also compact enough to be of practical use,” says Ping Zhao, Postdoc at the Photonics Laboratory at Chalmers and one of the lead authors of the scientific paper, now published in Science Advances.

The light amplification in the project is based on a principle known as the Kerr effect, which so far is the only known approach that amplifies light without causing significant excess noise. The principle has been demonstrated before, but never in such a compact format – previous versions were too bulky to be useful.

The new amplifier fits in a small chip just a few millimeters in size, compared to previous amplifiers that have been several thousand times larger.

Tiny, quiet, and with high performance

Additionally, the new amplifiers offer a level of performance high enough that they can be placed more sparingly, making them a more cost-effective option. They also work in a continuous wave (CW) operation rather than a pulsed operation only.

“What we demonstrate here represents the first CW operation with an extremely low noise in a compact integrated chip. This provides a realistic opportunity for practical use in a variety of applications. Since it’s possible to integrate the amplifier into very small modules, you can get cheaper solutions with much better performance, making this very interesting for commercial players in the long run,” says research leader Peter Andrekson.

The new results also open doors to completely new applications in both technology and science, explains Peter Andrekson.

“This amplifier shows unprecedented performance. We consider this to be an important step towards practical use, not only in communication, but in areas including quantum computers, various sensor systems and in metrology when making atmospheric measurements from satellites for Earth monitoring.”

See the full article here .

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Chalmers University of Technology [tekniska högskola] (SE) is a Swedish university located in Gothenburg that focuses on research and education in technology, natural science, architecture, maritime and other management areas

The University was founded in 1829 following a donation by William Chalmers, a director of the Swedish East India Company. He donated part of his fortune for the establishment of an “industrial school”. Chalmers was run as a private institution until 1937, when the institute became a state-owned university. In 1994, the school was incorporated as an aktiebolag under the control of the Swedish Government, the faculty and the Student Union. Chalmers is one of only three universities in Sweden which are named after a person, the other two being Karolinska Institutet and Linnaeus University.