Optical amplifier offers record low noise

By using a phase sensitive fibre optic parametric amplifier, the researchers were able to reduce the noise figure down to 1dB, the lowest ever reported, and maintain a reasonably large signal gain. They believe the breakthrough could enable an increase in optical fibre signals from 1000 to 4000km and pave the way for increased capacity in data communications. According to Professor Peter Andrekson (pictured), who led the team, the amplifier could also lead to better internet traffic and laser radar technology, as well as promote applications where detection of weak levels of light is essential, such as free space communication. "This is the ultimate optical amplifier," said Professor Andrekson. "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." The next step for the researchers, according to Andrekson, is towards commercial application. "The entire optical telecom industry is our market," he noted. "But the technology is generic, and scalable to other wavelengths like visible or infrared light. This 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."