Washington DC (SPX) Mar 01, 2011
With worldwide Internet data traffic increasing by 50 percent each year, telecommunications companies that handle this digital torrent must be able to economically expand the capacities of their networks while also adapting to new, more-efficient data-handling technologies. Over the last decade, a development team at Infinera Corp. in Sunnyvale, Calif. has pioneered the design and manufacture of photonic integrated circuits (PICs) aimed at meeting that need.
This technology has enabled the team to achieve a record one trillion bits per second (1 Terabit/s) speed on a single integrated indium phosphide chip. The findings will be presented at the Optical Fiber Communication Conference and Exposition/National Fiber Optic Engineers Conference (OFC/NFOEC) taking place March 6 - 10 at the Los Angeles Convention Center.
"Traditional transponder-based system architectures are inflexible and costly and time-consuming to upgrade," said Dr. Radhakrishnan Nagarajan, research fellow at Infinera and a senior member of Infinera's PIC development team. "Our PIC approach enables us to make optical networks more powerful, flexible and reliable than ever before using equipment that is significantly smaller, less expensive and uses much less energy."
Infinera's latest PIC is at the heart of a new 10-channel receiver, each channel operating at 100 Gbit/s data rates. This is the first in the industry to achieve a capacity of 1 Terabit/s on a single photonic integrated chip.
It contains more than 150 optical components-such as frequency tunable local oscillator (LO) lasers, devices for mixing the LO and incoming signals, variable optical attenuators for LO power control, a spectral demultiplexer to separate the individual wavelength channels, and 40 balanced photodetector (receiver/transmitter) pairs-all integrated onto a chip smaller than a fingernail.
The key technical advance operating behind 100-Gbit/s-per-channel technology is the ability to detect incoming data encoded using the optical industry's most spectrally efficient modulation technique, called polarization multiplexed Quadrature Phase-Shift Keying, or PM-QPSK. To explain the acronym, first PM: it is similar to the wireless communications technique of alternating the polarization of adjacent channels.
How does QSPK work? In virtually all types of data transmission, the information is encoded in ways that allow it to travel the farthest while occupying the least amount of signal spectrum. Just as radio's AM (amplitude modulation) and FM (frequency modulation) imprints information on, respectively, the amplitude and frequency of its broadcast waves, QPSK modifies the light's phase to represent the data. All in all, PM-QPSK permits four times more information to be conveyed each second than was possible with the previous method, which simply switched the laser light on and off.
The news here is not about the PM-QPSK modulation scheme per se, but rather that Infinera has, for the first time, integrated it all onto a single 10x100 Gbit/s photonic integrated circuit.
"But just as important as a transmitter's clever and efficient encoding method is a fast and reliable way for the receiver to convert the information back to its original form," said Dr. Nagarajan.
"For PM-QPSK, we designed and integrated narrow-linewidth lasers that detect the phase encoded data very efficiently."
Infinera expects PICs with a capability of a terabit or more to be commercially available within a few years. The company has announced that a 500 Gbit/s PIC will be available in 2012. Infinera's 100 Gbit/s PICs are widely deployed in long-haul and metro networks worldwide.
Transmitter and receiver PICs are typically installed at critical nodes and at each end of "long haul" optical networks. Like non-stop flights between airline hubs, these intercity and intercontinental optical fiber links carry the bulk of Internet traffic. Worldwide, more than 20 exabytes-20 trillion trillion bytes (or 160 exabits)-have been estimated to pass through the Internet every month.
PICs enable massive amounts of cost-effective bandwidth and facilitate the networks at the heart of the Internet to become more scalable and quicker to react to sudden changes in demand. "In many ways, PIC-based optical networks are starting to take on the intelligent features of routed (IP) networks, like the ability to reroute traffic in the event of a break in the fiber-but at a fraction of the cost and power consumption," Dr. Nagarajan added.
Share This Article With Planet Earth
Computer Chip Architecture, Technology and Manufacture
Nano Technology News From SpaceMart.com
Direct electronic readout of 'Artificial atoms'
Bochum, Germany (SPX) Mar 01, 2011
Bochum physicists are constructing 0-dimensional systems Through his participation, the research team from Bochum, Duisburg-Essen, and Hamburg now has succeeded in an energy-state occupancy readout of those artificial atoms - using common interfaces to classic computers. This is a big step towards the application of such systems. They report about their findings in Nature Communications. ... read more
Dell plans China expansion: state media|
Xoom sales 'off to good start': Motorola CEO
Videogame makers seek footing on shifting landscape
Japan's NEC in LCD tie-up with China's Tianma
ONR Moves A Modular Space Communications Asset Into Unmanned Aircraft For Marines
Northrop Grumman Next-Gen FBCB2 System Approved For Fielding
Boeing To Demonstrate Aviation Command And Control Subsystem For US Marine Corps
RC-12X Aircraft Provides Highly-Capable SIGINT Systems To Warfighter
NASA Assessing New Launch Dates For The Glory Mission
Successful Launch Of REXUS 9
24 hour delay for launch of NASA satellite
SpaceX to focus on astronaut capsule
Russia launches key satellite on second attempt
Helping Towing Fleets Manage Operations More Efficiently
CSC Launches Mobile Solution For Healthcare Professionals
Destron Fearing Launches Global Pocket Reader Series
US "air capital" savors Boeing tanker victory
China to spend $230 bn on aviation sector
Revolutionary Design For Stratospheric High Altitude Balloon Missions
EU states can fine airlines for excessive noise: court
Development Team Achieves One Terabit per Second Data Rate On Single Integrated Photonic Chip
Increasing Processor Efficiency By 'Shutting Off The Lights'
Direct electronic readout of 'Artificial atoms'
Manipulating Molecules For A New Breed Of Electronics
Ministerial Panel Deliberates Google's Planned Launch Of Street View
NASA Spacecraft Images New Zealand Quake Region
Earth's Core Rotating Faster Than Rest Of The Planet
Glory And Taurus Ready For Liftoff
Russia jails four environmentalists after protest
Kenya, France seek new global environment body
Baby dolphins dying along oil-soaked US Gulf Coast
Beijing air pollution off the charts, US says
|The content herein, unless otherwise known to be public domain, are Copyright 1995-2010 - SpaceDaily. AFP and UPI Wire Stories are copyright Agence France-Presse and United Press International. ESA Portal Reports are copyright European Space Agency. All NASA sourced material is public domain. Additional copyrights may apply in whole or part to other bona fide parties. Advertising does not imply endorsement,agreement or approval of any opinions, statements or information provided by SpaceDaily on any Web page published or hosted by SpaceDaily. Privacy Statement|