Automatic DC bias control for the duobinary modulation format utilizing a low-pass electrical filter
AssigneeKodeos Communications
InventorsRoey Harel, Dean Pappas, Gleb Shtengel, Jason B. Stark, Donald V. Le Roy
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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.
Claims12
A method for controlling the bias point of a Mach-Zehnder modulator, said method comprising the steps of:
- applying a dither signal to a DC bias that is applied to a Mach-Zehnder modulator;
- detecting a component of an optical output signal provided by the Mach-Zehnder modulator that is synchronous with the dither signal;
- and
- adjusting the dither signal to maintain the detected component of the optical output signal at a substantially constant value.
An apparatus for controlling the bias point of a Mach-Zehnder modulator, comprising:
- means for applying a dither signal to a DC bias that is applied to a Mach-Zehnder modulator;
- means for detecting a component of an optical output signal provided by the Mach-Zehnder modulator that is synchronous with the dither signal;
- and
- means for adjusting the dither signal to maintain the detected component of the optical output signal at a substantially constant value.
Dependencies are inferred from the claim text.