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:
May. 12, 2026
Filed:
Mar. 18, 2024
Hqphotonics Inc., Pasadena, CA (US);
Jiang Li, Alhambra, CA (US);
Kerry Vahala, Pasadena, CA (US);
HQPHOTONICS INC., Pasadena, CA (US);
Abstract
A tunable voltage-controlled oscillator (VCO), a dual optical-frequency reference source, an electrical reference oscillator, and an electro-optic frequency divider (eOFD) form a microwave-frequency source. The VCO generates output and modulating signals at frequency fthat is tunable over at least ±5% or more of a nominal microwave frequency. From the VCO signal at fand output from the dual optical-frequency reference source at frequencies vand v, the eOFD generates an eOFD signal at δf=|v−v−n·f| from which a loop-filtered error signal is derived, dependent on relative phase of the eOFD signal and a reference oscillator signal. The error signal is applied to the VCO to function as a phase-locked loop to stabilize the frequency f, which can exhibit phase noise across the tuning range that is −120 dBc/Hz+10*log(f/10 GHZ), or less, at 10 kHz offset frequency.