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:
Mar. 14, 2017
Filed:
Mar. 06, 2015
California Institute of Technology, Pasadena, CA (US);
Jiang Li, Pasadena, CA (US);
Kerry Vahala, Pasadena, CA (US);
California Institute of Technology, Pasadena, CA (US);
Abstract
A microwave-frequency source, generating an output electrical signal at an output frequency f, comprises a pump laser source, an optical resonator, and a photodetector. Free spectral range vof the optical resonator equals an integer submultiple of a Brillouin shift frequency vof the optical resonator (i.e., v=Mv). The pump laser source is frequency-locked to a corresponding resonant optical mode of the optical resonator. Pumping the optical resonator with output of the pump laser source at a pump frequency vresults in stimulated Brillouin laser oscillation in the optical resonator at respective first, second, and third Stokes Brillouin-shifted frequencies v=v−v, v=v−2v, and v=v−3v. The photodetector receives stimulated Brillouin laser outputs at the first and third Stokes Brillouin-shifted frequencies vand vand generates therefrom the output electrical signal at a beat frequency f=v−v=2v. The output electrical signal at the output frequency fexhibits exceptionally low phase noise.