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. 17, 2012
Filed:
Jan. 15, 2010
Preetpaul S Devgan, Laurel, MD (US);
Vincent J Urick, Alexandria, VA (US);
Keith J Williams, Dunkirk, MD (US);
John F. Diehl, Bowie, MD (US);
Christopher E. Sunderman, Rockville, MD (US);
Preetpaul S Devgan, Laurel, MD (US);
Vincent J Urick, Alexandria, VA (US);
Keith J Williams, Dunkirk, MD (US);
John F. Diehl, Bowie, MD (US);
Christopher E. Sunderman, Rockville, MD (US);
The United States of America, as represented by the Secretary of the Navy, Washington, DC (US);
Abstract
A method and system for processing analog optical signals to produce a single RF output free from even-order harmonic distortion. Two analog optical signals of different wavelengths λare input into a dual-output Mach-Zehnder modulator (MZM), where one wavelength input is high-biased and one wavelength is low-biased. The complementary high- and low-biased wavelengths are output from each arm of the MZM to a multiplexer, which filters out the unwanted high- or low-biased wavelengths from each MZM arm so that both wavelengths are low-biased or high-biased. The signals are passed to a pair of photodiodes, and the photocurrents from the photodiodes are differenced to produce the final RF output. Because of the complementary phase differences between the two low- or high-biased signals generating the photocurrent, all components of the photocurrent except the fundamental and odd-order harmonics cancel each other, resulting in a high-quality RF output free from harmonic distortion.