NETWORK WORLD NEWSLETTER: OPTICAL NETWORKING 09/13/04 Dear [EMAIL PROTECTED],
In this issue: * Research team builds better laser for optical communications * Links related to Optical Networking * Featured reader resource _______________________________________________________________ This newsletter is sponsored by Cisco IP Communications represents a major opportunity for businesses large and small. By eliminating the need to maintain separate telephone and data infrastructures, extraordinary benefits are often achieved. For information on the union of telephony and data on a single physical network and the security issues involved see the Special Report IP Telephony Security: http://www.fattail.com/redir/redirect.asp?CID=81049 _______________________________________________________________ CHECK OUT NW FUSION'S NEW WHITE PAPER LIBRARY NW Fusion's White Paper Library was recently re-launched with new features and improved capabilities! Sort NW Fusion's library of white papers by Date and Vendor, view white papers by TECHNCIAL CATEGORY, mouse over white paper descriptions and take advantage of our IMPROVED white paper search engine. CLICK HERE: http://www.fattail.com/redir/redirect.asp?CID=81026 _______________________________________________________________ Today's focus: Japanese team claims optical breakthrough By Martyn Williams Scientists from Fujitsu and The University of Tokyo have developed a laser that is capable of maintaining a stable output over a wide temperature range at speeds and frequencies useful for optical communications, the research team said recently. The device could enable the creation of optical networking equipment that is smaller, cheaper and consumes less power than current devices, the leader of the research team said. The laser was developed by a team led by Yasuhiko Arakawa, director of the Nanoelectronics Collaborative Research Center at The University of Tokyo, and is based on quantum dots. Details of the technology were presented as a post-deadline paper at the European Conference and Exhibition on Optical Communication 2004 that took place in Stockholm Sept. 5-9. Current lasers suffer output fluctuations as the operating temperature changes: As the temperature changes from 20 degrees Celsius to 70 degrees Celsius the output power can drop by about a quarter, according to data provided by Arakawa and Fujitsu. To provide the kind of stable output required by applications such as optical networking, systems must be built to adjust the power of the laser to keep the output constant as the temperature changes or keep the laser at a constant temperature so the input power can remain the same. Both of these solutions mean extra cost, extra power consumption and extra bulk. "If the laser is inherently temperature stable, then it is much better," said Arakawa. The laser announced by Arakawa's team uses quantum dot technology. Quantum dot lasers are capable of maintaining a stable output over a temperature range of several tens of degrees Celsius but until now haven't been demonstrated working at the kind of speeds and frequencies demanded for commercial optical communications work. That has now changed with Arakawa's announcement that his team maintained a stable output from a quantum dot laser over a temperature range of 20 degrees Celsius to 50 degrees Celsius while working at 10G bit/sec at the 1.3 micron wavelength, which is one of the two major standard wavelengths used in current optical communications systems, he said in an interview. Getting a quantum dot laser to work at that speed and frequency is a first, Arakawa said. Looking ahead, Arakawa said he wants to increase the temperature range over which stable output is maintained. At present the laser exhibits a minimal change in output between 50 degrees Celsius and 70 degrees Celsius and Arakawa said it is "not so difficult" to expand the temperature range. The team's goal is to have a product ready for commercialization by 2007 that can be used in telecommunications equipment and is one quarter the size of current lasers, works at a lower power and is one third the cost. This isn't the first time this year Arakawa's team announced progress in quantum dot research. In July as part of another research project being conducted with Fujitsu, Arakawa's team said they reliably generated and detected single photons using a quantum dot laser. Such generation of single photons is vital for quantum cryptography systems. There are other potential uses for quantum dot devices, said Arakawa. These include new types of ultra-dense memory chip where data is encoded onto a handful of electrons or biotechnology and sensing applications. However at present the two applications closest to being realized are the two he is researching, quantum cryptography and optical communications, he said. Martyn Williams is with the IDG News Service, which is a Network World affiliate. _______________________________________________________________ To contact: Martyn Williams Martyn Williams is a reporter for the IDG News Service, a Network World affiliate. He can be reached at mailto:[EMAIL PROTECTED] _______________________________________________________________ This newsletter is sponsored by SBC Gimme Shelter! Converged Services Spell Relief For Beleaguered Network Managers Switched IP networks are rapidly becoming the corporate communications architecture of choice. By converging voice, data and video onto IP telephony platforms and Virtual Private Networks, enterprises can supply bandwidth when and where end users need it, while significantly lowering administrative and equipment costs. Click here to download this Whitepaper now http://www.fattail.com/redir/redirect.asp?CID=81080 _______________________________________________________________ ARCHIVE LINKS Breaking optical-networking news from Network World, The Edge and around the 'Net, updated daily: http://www.nwfusion.com/topics/optical.html Archive of the Optical Networking newsletter: http://www.nwfusion.com/newsletters/optical/index.html _______________________________________________________________ FEATURED READER RESOURCE NETWORK WORLD SPECIAL REPORTS NOW AVAILABLE Focused reports on compelling industry topics, Network World Special Reports are available online at Network World Fusion. Network World Special Reports on IP Telephony Security, the State of Wireless LANs, trends in the networked world and more are currently available. 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