Automatic DC bias control for the duobinary modulation...

Details Automatic DC bias control for the duobinary modulation... Automatic DC bias control for the duobinary modulation...

2006-04-25

2006-04-25

Sugarman, Scott J. (Department: 2873)

Optical: systems and elements

Optical modulator

Light wave temporal modulation

Reexamination Certificate

active

07034977

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.

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patent: 2003/0175037 (2003-09-01), Kimmitt et al.
patent: 1 182 807 (2002-02-01), None

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