Featured Research

from universities, journals, and other organizations

Optical amplifier with world record low noise

Date:
June 21, 2011
Source:
Expertanswer (Expertsvar in Swedish)
Summary:
Researchers in Sweden have demonstrated an optical amplifier which can amplify light with extremely low noise. 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.

Researchers at Chalmers have demonstrated an optical amplifier which can amplify light with extremely low noise. 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.

Related Articles


Today´s flow of information demands increasing capacity. Optical amplifiers are crucial enablers of data communication, with the mission to increase data signals without first converting them to electrical signals. Not only the speed and capacity require improvements, but it has become increasingly important to maintain a high signal-to-noise ratio of the signal being transmitted.

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.


Story Source:

The above story is based on materials provided by Expertanswer (Expertsvar in Swedish). Note: Materials may be edited for content and length.


Journal Reference:

  1. Z. Tong, C. Lundström, P. A. Andrekson, C. J. McKinstrie, M. Karlsson, D. J. Blessing, E. Tipsuwannakul, B. J. Puttnam, H. Toda, L. Grüner-Nielsen. Towards ultrasensitive optical links enabled by low-noise phase-sensitive amplifiers. Nature Photonics, 2011; DOI: 10.1038/nphoton.2011.79

Cite This Page:

Expertanswer (Expertsvar in Swedish). "Optical amplifier with world record low noise." ScienceDaily. ScienceDaily, 21 June 2011. <www.sciencedaily.com/releases/2011/06/110621131221.htm>.
Expertanswer (Expertsvar in Swedish). (2011, June 21). Optical amplifier with world record low noise. ScienceDaily. Retrieved December 20, 2014 from www.sciencedaily.com/releases/2011/06/110621131221.htm
Expertanswer (Expertsvar in Swedish). "Optical amplifier with world record low noise." ScienceDaily. www.sciencedaily.com/releases/2011/06/110621131221.htm (accessed December 20, 2014).

Share This


More From ScienceDaily



More Matter & Energy News

Saturday, December 20, 2014

Featured Research

from universities, journals, and other organizations


Featured Videos

from AP, Reuters, AFP, and other news services

Building Google Into Cars

Building Google Into Cars

Reuters - Business Video Online (Dec. 19, 2014) — Google's next Android version could become the standard that'll power your vehicle's entertainment and navigation features, Reuters has learned. Fred Katayama reports. Video provided by Reuters
Powered by NewsLook.com
AP Review: Nikon D750 and GoPro Hero 4

AP Review: Nikon D750 and GoPro Hero 4

AP (Dec. 19, 2014) — What to buy an experienced photographer or video shooter? There is some strong gear on the market from Nikon and GoPro. The AP's Ron Harris takes a closer look. (Dec. 19) Video provided by AP
Powered by NewsLook.com
Double-Amputee Becomes First To Move Two Prosthetic Arms With His Mind

Double-Amputee Becomes First To Move Two Prosthetic Arms With His Mind

Buzz60 (Dec. 19, 2014) — A double-amputee makes history by becoming the first person to wear and operate two prosthetic arms using only his mind. Jen Markham has the story. Video provided by Buzz60
Powered by NewsLook.com
Navy Unveils Robot Fish

Navy Unveils Robot Fish

Reuters - Light News Video Online (Dec. 18, 2014) — The U.S. Navy unveils an underwater device that mimics the movement of a fish. Tara Cleary reports. Video provided by Reuters
Powered by NewsLook.com

Search ScienceDaily

Number of stories in archives: 140,361

Find with keyword(s):
 
Enter a keyword or phrase to search ScienceDaily for related topics and research stories.

Save/Print:
Share:  

Breaking News:

Strange & Offbeat Stories

 

Space & Time

Matter & Energy

Computers & Math

In Other News

... from NewsDaily.com

Science News

Health News

Environment News

Technology News



Save/Print:
Share:  

Free Subscriptions


Get the latest science news with ScienceDaily's free email newsletters, updated daily and weekly. Or view hourly updated newsfeeds in your RSS reader:

Get Social & Mobile


Keep up to date with the latest news from ScienceDaily via social networks and mobile apps:

Have Feedback?


Tell us what you think of ScienceDaily -- we welcome both positive and negative comments. Have any problems using the site? Questions?
Mobile iPhone Android Web
Follow Facebook Twitter Google+
Subscribe RSS Feeds Email Newsletters
Latest Headlines Health & Medicine Mind & Brain Space & Time Matter & Energy Computers & Math Plants & Animals Earth & Climate Fossils & Ruins