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AT&T And LaserComm Team Up to Achieve a Major Breakthrough in Broadband Optical Transmission.

Business Editors, Hi-Tech Writers


AT&T Labs, the research arm of AT&T (NYSE:T), and LaserComm Inc. today announced a breakthrough in developing next-generation high-bandwidth long-haul optical networks. Using LaserComm's proprietary Hi-Mode Dispersion Management Device(TM) (DMD), the two companies were able to achieve 40 nm-wide wave division multiplexing (WDM) transmission of broadband 40 Gbps signals over a distance of 240km.

Chromatic dispersion and dispersion slope - the tendency for light to spread out as it passes through a medium are major obstacles in the implementation of next-generation broadband dense wave-division multiplexing (DWDM) systems transmission above 2.5 Gbps. Today's solution, dispersion compensating fiber, cannot solve dispersion slope, leading to complicated and expensive trimming of individual channels. LaserComm's Hi-Mode DMD uses a novel, elegant method of wideband dispersion compensation capable of correcting all wavelengths of light simultaneously with minimal loss and without exciting nonlinear effects. The DMD's advantageous performance has been successfully validated in AT&T's advanced broadband 40Gbps transmission testing system.

"Overcoming the limitations of dispersion and dispersion slope is critical for enabling broadband long-haul transmission," explained Bob Tkach, Division Manager of the Lightwave Networks Research department at AT&T Labs. "The performance of LaserComm's device was well above our expectations. This is the first device to provide full dispersion slope compensation on non-zero dispersion shifted fiber."

In the experiment, eight laser sources from 1525nm to 1565nm, each modulated at 40 Gbps, were simultaneously transmitted through 240 km of non-zero dispersion shifted fiber (NZDSF) comprising three equal segments with in-line optical amplifiers. The unique aspect of this test was that a single Hi Mode DMD simultaneously compensated the different dispersions of all eight wavelengths for each segment.

"We could not have validated the extent of our device's capabilities without AT&T's collaboration and their advanced testing system," says Dan Acton, President of LaserComm. "Based on the outcome of this common effort we can now present the industry with the first ever broadband chromatic dispersion solution for 40 Gbps transmission."

About AT&T Labs

AT&T ( is among the premier voice and data communications companies, serving more than 80 million customers, including consumers, businesses and government. With annual revenues of more than $53 billion and 149,000 employees, AT&T provides services to customers worldwide. Backed by the research and development capabilities of AT&T Labs, the company runs the world's largest, most sophisticated communications network and has the largest digital wireless network in North America. The company is a leading supplier of data and Internet services for businesses and offers outsourcing, consulting and networking-integration to large businesses. It also has the nation's largest direct Internet access service for consumers. Through its recent cable acquisitions, AT&T will bring its bundle of broadband video, voice and data services to customers throughout the United States. Internationally, the AT&T/British Telecom Global Venture will serve the communications needs of multinational companies and international carriers worldwide.

About LaserComm

LaserComm, a privately held company, is a leader in developing photonic components for fiber optic networks. The Company was founded in 1998, with US headquarters in Plano, Texas and a research and development subsidiary in Tel Aviv, Israel. LaserComm recently closed a $15 million round of financing, speeding the Company's development of next-generation optical networking technology. LaserComm is constructing a manufacturing plant in Plano, Texas, where the Company will manufacture its own products. More information about LaserComm can be found at
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Publication:Business Wire
Date:Mar 6, 2000
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