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:
Aug. 12, 2014
Filed:
Mar. 19, 2012
Kenneth Mcgreer, Livermore, CA (US);
Kenneth McGreer, Livermore, CA (US);
Neophotonics Corporation, San Jose, CA (US);
Abstract
An optical waveguide router device with feedback control that uses the fringe frequencies of an optical data signal to derive a wavelength (e.g., temperature) control signal in order to compensate for wavelength variations due to temperature fluctuations and/or other wavelength shifting factors without the need for a reference laser. A monitoring circuit converts an output of at least one output monitoring port to an electrical signal and comparing the output of said at least one output monitoring port against 1) a reference signal, or 2) at least one output from another output monitoring port having a higher or lower frequency fringe of an optical data signal of at least one data port, or 3) at least one output from another output monitoring port having light from diffraction pattern(s), and outputting a control signal reflecting a result of the comparison to control at least one center wavelength of the waveguide router.