Controlling a bias voltage for a Mach-Zehnder modulator

Details Controlling a bias voltage for a Mach-Zehnder modulator Controlling a bias voltage for a Mach-Zehnder modulator

2007-06-26

2010-06-01

Sedighian, M. R. (Department: 2613)

Optical communications

Transmitter

Including compensation

C398S183000, C359S238000

Reexamination Certificate

active

07729621

ABSTRACT:
In one embodiment, the present invention includes a controller coupled to an optical modulator to receive a dither signal, determine a difference between the dither signal and a previous dither signal, determine a derivative of the difference with respect to a bias voltage difference between first and second bias voltages, and control a bias voltage for the optical modulator based on the derivative. Other embodiments are described and claimed.

REFERENCES:
patent: 6392779 (2002-05-01), Iannelli et al.
patent: 6687451 (2004-02-01), Sikora
patent: 7106486 (2006-09-01), Nahapetian et al.
patent: 7394992 (2008-07-01), Kimmitt et al.
patent: 7555226 (2009-06-01), Tipper
U.S. Appl. No. 11/638,177, filed Dec. 12, 2006, entitled “Optical Communications Circuit Current Management,” by Craig Schulz, et al.

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