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:
Dec. 31, 2019
Filed:
Apr. 28, 2018
Hqphotonics Inc., Pasadena, CA (US);
Jiang Li, Pasadena, CA (US);
Kerry Vahala, Pasadena, CA (US);
HQPHOTONICS INC., Pasadena, CA (US);
Abstract
A voltage-controlled oscillator generates a VCO output signal at frequency f. A dual optical-frequency source generates optical signals at frequencies vand v. An electro-optic frequency divider (EOFD) generates multiple optical sidebands spaced by f, and from two sidebands generates a beat signal at beat frequency δf. A first control circuit generates an error signal from the beat signal and a first reference signal at frequency f, and couples the VCO and the EOFD in a negative feedback arrangement that stabilizes the output frequency f. A second control circuit generates an error signal from the frequency-divided output signal and a second reference signal at frequency f, and couples the VCO and one or both of the dual source or the first reference signal in a negative feedback arrangement that stabilizes, or compensates for fluctuations of, a difference frequency v−v.