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:
Jun. 18, 2002
Filed:
Nov. 25, 1998
Ralph Spickermann, Redwood City, CA (US);
Lockheed Martin Corporation, Bethesda, MD (US);
Abstract
Systems and methods that improve data transmission over a wavelength division multiplexed optical link. First and second wavelength division multiplexed modulators modulate data for transmission onto a microwave carrier signal to produce first and second carrier signals having a first carrier frequency. A downconverter downconverts the first carrier signal to a lower carrier frequency. A combiner combines the downconverted and second carrier signals to provide a composite microwave signal. A wavelength division multiplexed transmitter transmits the composite microwave signal on a wavelength division multiplexed channel over an optical fiber. A wavelength division multiplexed receiver reproduces the composite microwave signal transmitted over the optical fiber. A splitter and filters separate out the downconverted and second carrier signals from the composite microwave signal. An upconverter upconverts the downconverted carrier signal from the lower carrier frequency to the first carrier frequency. Demodulators demodulates the upconverted and second carrier signals to generate the originally transmitted data. The systems and methods use higher order modulated microwave carriers (M-ary ASK, PSK, QAM, etc.) to intensity modulate the optical carrier. As a result, more than 1 bit/Hz of optical channel can be transmitted.