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:
Sep. 19, 2006
Filed:
Aug. 08, 2005
John C. Carrick, Wakefield, MA (US);
Stuart D. Brorson, Marlborough, MA (US);
Eric J. Frankfort, Yorktown Heights, NY (US);
Paul C. Talmadge, Ansonia, CT (US);
Roger P. Holmstrom, St. Charles, IL (US);
John C. Carrick, Wakefield, MA (US);
Stuart D. Brorson, Marlborough, MA (US);
Eric J. Frankfort, Yorktown Heights, NY (US);
Paul C. Talmadge, Ansonia, CT (US);
Roger P. Holmstrom, St. Charles, IL (US);
Tellabs Operations, Inc., Naperville, IL (US);
Abstract
Methods and apparatus for maintaining a pre-determined ratio of a pilot tone power and a total mean optical power of an optical signal are provided. One apparatus includes an optical source coupled to provide an optical signal in response to a DC bias and an AC bias corresponding to a pilot tone signal. A processor is coupled to compute each of an AC component and a DC component of the optical signal from the same digitally sampled signal. A feedback control is coupled to vary at least one of the DC bias and the AC bias in accordance with a difference between a pre-determined value and a ratio of the AC and DC components.