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. 26, 2018
Filed:
Aug. 11, 2016
California Institute of Technology, Pasadena, CA (US);
The United States of America, As Represented BY the Secretary of Commerce, Washington, DC (US);
Kerry Vahala, Pasadena, CA (US);
Scott Diddams, Boulder, CO (US);
Jiang Li, Pasadena, CA (US);
Xu Yi, Pasadena, CA (US);
Hansuek Lee, Pasadena, CA (US);
CALIFORNIA INSTITUTE OF TECHNOLOGY, Pasadena, CA (US);
THE UNITED STATES OF AMERICA, AS REPRESENTED BY THE SECRETARY OF COMMERCE, Washington, DC (US);
Abstract
A microwave-frequency source at frequency fcomprises: a dual optical-frequency reference source, an electro-optic sideband generator, an optical bandpass filter, an optical detector, a reference oscillator, an electrical circuit, and a voltage-controlled oscillator (VCO). The sideband generator modulates dual optical reference signals at vand vto generate sideband signals at v±nfand v±nf. The bandpass filter transmits sideband signals at v+Nfand v−Nf. The optical detector generates a beat note at (v−Nf)−(v+Nf). The beat note and a reference oscillator signal are processed by the circuit to generate a loop-filtered error signal to input to the VCO. Output of the VCO at fdrives the sideband generator and forms the microwave-frequency output signal. The resultant frequency division results in reduced phase noise on the microwave-frequency signal.