Alcatel Extends Distance for Densely Packed WDM Optical Terrestrial Transmission with New World Record.Business Editors DALLAS--(BUSINESS WIRE)--Jan. 7, 2002 Alcatel (NYSE NYSE See: New York Stock Exchange : ALA), a world leader in intelligent optical networking Communications between computers, telephones and other electronic devices using light. An optical network is far more reliable and has far greater potential transmission capacity than networking in the electrical domain. See optical fiber. , achieved another first in optical networks: transmission of 125 wavelength division multiplexing See WDM. (communications) wavelength division multiplexing - (WDM) Multiplexing several Optical Carrier n signals on a single optical fibre by using different wavelengths (colours) of laser light to carry different signals. (WDM (1) (Wavelength Division Multiplexing) A technology that uses multiple lasers and transmits several wavelengths of light (lambdas) simultaneously over a single optical fiber. ) channels of data at an effective rate of 40 Gbit/s per channel. This record performance represents a total capacity of 5 Tbit/s over 1,500 kilometers of Alcatel TeraLight Ultra optical fiber, as Alcatel continues to maximize available bandwidth and transmission distance over a single fiber with WDM technology. The total throughput would enable the simultaneous transport of 80 million voice calls or more than 500,000 high bit rate DSL DSL in full Digital Subscriber Line Broadband digital communications connection that operates over standard copper telephone wires. It requires a DSL modem, which splits transmissions into two frequency bands: the lower frequencies for voice (ordinary Internet lines per second, over a single optical fiber. The breakthrough was achieved with Alcatel's dual-stage hybrid Erbium/Raman amplifiers, 40 Gbit/s WDM systems, forward error correction A communications technique that can correct bad data on the receiving end. Before transmission, the data are processed through an algorithm that adds extra bits for error correction. If the transmitted message is received in error, the correction bits are used to repair it. technology, and TeraLight Ultra optical fiber optimized specifically for high-speed, long-haul and ultra long haul transmission. TeraLight Ultra, Alcatel's non-zero dispersion shifted fiber is ideal for successful operation over high data rates and long distances. Enhanced performance of polarization mode dispersion Polarization mode dispersion (PMD) is a form of modal dispersion where two different polarizations of light in a waveguide, which normally travel at the same speed, travel at different speeds due to random imperfections and asymmetries, causing random spreading of optical pulses. , chromatic dispersion slope, and reduced attenuation Loss of signal power in a transmission. Attenuation The reduction in level of a transmitted quantity as a function of a parameter, usually distance. It is applied mainly to acoustic or electromagnetic waves and is expressed as the ratio of power densities. at key Raman amplification wavelengths, all combine for record-setting efficiency that network operators need for optimized long-haul network economy with advanced technologies. A formula used by technologists to describe these results, called the "capacity times distance product," combines the key variables of the number of channels, data rate, and distance carried. It is an important indicator of a single fiber's ability to carry huge amounts of data and also the distance required between regeneration points. Maximizing this distance helps telecommunication carriers reduce their equipment costs. Alcatel's latest result yields 7.5 Pb/s*km (5 Tbit/s over 1,500 km), a record in terrestrial transmission based upon 40 Gbit/s per channel. "These results are very important for our customers, as they demonstrate the TeraLight product family's readiness for the evolution of systems," said Bernard Le Mouel, chief technology officer of Alcatel's Optics Group. "Because fiber is expected to have a lifespan of decades, its ability to perform tomorrow is at least as important as its ability to perform today. TeraLight Ultra eliminates the concerns about necessitating an outside plant overhaul at the advent of 40Gbit/s and beyond." Alcatel builds next generation networks, delivering integrated end-to-end voice and data networking solutions to established and new carriers, as well as enterprises and consumers worldwide. With sales of Euro 27 billion in 2000 and 110,000 employees, Alcatel operates in more than 130 countries. For more information, www.alcatel.com |
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