Product category: Lasers
News Release from: Furukawa Electric Europe
Edited by the Electronicstalk Editorial Team on 5 December 2001
Patent acknowledges work on WDM pumping
The US Patent and Trademark Office has issued a patent covering techniques developed by Furukawa Electric for the use of Raman amplifiers for wavelength division multiplexing transmission
The United States Patent and Trademark Office has issued a patentcovering techniques developed by Furukawa Electric that improvethe use of Raman amplifiers for wavelength division multiplexingtransmission systems. The patent covers a novel technique called'wavelength-division multiplexed pumping', in whichmultiple wavelengths are simultaneously used to achieve thedesirable shape of Raman gain spectrum for WDM transmissions.This invention enables a reliable laser diode to be used forRaman amplifiers.
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The company expects the techniques disclosed inthis patent to be used in many next-generation WDM systems, keyelements in the development of future high-speed opticaltransmission systems.
The patent, therefore, is expected to be acrucial part of the development of Furukawa's globalstrategy as a leading provider of components for opticalcommunications.
Most current optical communication systems useoptical amplifiers together with WDM transmission technologies inorder to reduce cost by efficiently multiplexing signals andextending the distance of non-electrically regeneratedtransmissions.
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Raman amplifiers use conventional opticaltransmission fibre for their gain medium, while erbium-dopedfibre amplifiers (EDFA), widely used in conventional WDMtransmission systems, use erbium-doped fibre as the gain medium.As they can work as distributed amplifiers, Raman amplifiers havethe advantage of having lower noise than EDFA.
Mostnext-generation WDM systems will employ both EDFA and Ramanamplifiers together with deployed optical fibres.
Fundamentalpatents for Raman amplifiers have already expired since mostbasic research on Raman amplifiers was carried out in the 1970s.In the 1980s, there were also extensive studies on Ramanamplifiers; however, until now, there has been no need to studythe applications for Raman amplifiers in WDM transmissions.
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