The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jul. 31, 2012
Filed:
Jun. 11, 2009
Norio Kashima, Tokyo, JP;
Norio Kashima, Tokyo, JP;
Fujikura Ltd., Tokyo, JP;
Shibaura Institute of Technology, Tokyo, JP;
Abstract
An optical transmission system based on four-wave mixing and configured in a WDM-PON topology where a signal light between an optical line terminal and each of optical network units is multiplexed and demultiplexed at a WDM. The optical line terminal transmits downlink signal light having wavelengths λ, . . . , λand pumping lights having wavelengths λ, . . . , λwhich are different by a predetermined wavelength difference Δλ from the wavelengths of the downlink signal lights. Each of the optical network units demultiplexes the downlink signal lights to receive a portion of the downlink signal lights, generates an uplink signal light to be transmitted from each of the optical network unit to the optical line terminal by using a portion of the downlink signal lights and the four-wave mixing from the pumping lights, and outputs a modulated uplink signal light.