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. 16, 2005
Filed:
May. 10, 2000
John C. Carrick, Wakefield, MA (US);
Stuart D. Brorson, Brighton, 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, Brighton, 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 related to maintaining a pre-determined ratio of a pilot tone power and a total mean optical power of an optical signal are provided. One method includes the steps of detecting the AC and DC components of an optical signal having a pilot tone signal. An amplitude of the pilot tone signal is varied in accordance with a difference between a pre-determined value and a ratio of the AC and DC components. Another method includes the step of generating an optical signal in accordance with a DC bias and an AC bias corresponding to a pilot tone signal. The AC and DC components of the optical signal are detected. At least one of the DC bias and the AC bias is varied in accordance with a difference between a pre-determined value and a ratio of the AC and DC components. An apparatus includes an optical source providing an optical signal in response to a DC bias and an AC bias corresponding to a pilot tone signal. The apparatus includes detectors coupled to measure the AC and DC components of the optical signal. A feedback control varies 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. In various embodiments, the DC bias only, the AC bias only, or both the AC bias and the DC bias are varied.