KU Professors Get Patents

Three Kansas University professors have received a patent for a technology that neutralizes PMD. Sprint sponsored the project

November 7, 2002

1 Min Read

Lawrence, Kan. -- Three University of Kansas professors have earned a U.S. patent for a technology they developed that counters a pulse-broadening, phenomena-limiting, higher-bit-rate transmission over long-distancefiber-optic communication links.

Lead investigator Chris Allen, an associate professor in electrical engineering and computer science, set out to neutralize the harmful effects of polarization-mode dispersion (PMD), which corrupts data traveling over fiber-optic networks. Fiber-optic cable carries information in the form of light pulses through glass fiber. A single laser-by turning off and on rapidly-can transmit billions of bits per second. However, when the signaling rate is increased to tens of billions of bits per second, PMD becomes a significant problem, Allen said.

Allen, Ken Demarest, professor in electrical engineering and computer science, and Ron Hui, associate professor in electrical engineering and computer science, developed a "Method and Apparatus to Compensate for Polarization Mode Dispersion" that became Patent Number 6,459,830 on Oct. 1. They created the adaptive PMD compensator with student Hok Yong Pua and post-doctoral researcher Kumar Vijay Peddanarappagari at KU's Information and Telecommunication Technology Center. The patent was assigned to the group's sponsor for the project, Sprint.

"This patent is a tangible example of the successful and productive relationship Sprint and KU have enjoyed over many years," said Doug Richards, with Sprint's Technology Planning and Integration division. "This specific patent and the intellectual property behind it represent a solution for a particularly significant technological challenge facing all long-distance network providers."

Sprint Corp.

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