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:
Apr. 25, 2006
Filed:
Feb. 09, 2004
Automatic dc bias control for the duobinary modulation format utilizing a low-pass electrical filter
Roey Harel, New Providence, NJ (US);
Dean Pappas, Hamilton Square, NJ (US);
Gleb Shtengel, Basking Ridge, NJ (US);
Jason B. Stark, Holmdel, NJ (US);
Donald V. Le Roy, Doylestown, PA (US);
Roey Harel, New Providence, NJ (US);
Dean Pappas, Hamilton Square, NJ (US);
Gleb Shtengel, Basking Ridge, NJ (US);
Jason B. Stark, Holmdel, NJ (US);
Donald V. Le Roy, Doylestown, PA (US);
Kodeos Communications, South Plainfield, NJ (US);
Abstract
A method and apparatus is provided for controlling the bias point of a Mach-Zehnder modulator. The method begins by applying a dither signal to a DC bias that is applied to a Mach-Zehnder modulator. A component of an optical output signal provided by the Mach-Zehnder modulator that is synchronous with the dither signal is detected. The dither signal is adjusted to maintain the detected component of the optical output signal at a substantially constant value.