Optical: systems and elements – Optical modulator – Light wave temporal modulation
Reexamination Certificate
2005-08-16
2005-08-16
Epps, Georgia (Department: 2873)
Optical: systems and elements
Optical modulator
Light wave temporal modulation
C359S237000, C359S245000, C385S002000, C385S008000, C385S039000
Reexamination Certificate
active
06930814
ABSTRACT:
A method of, and apparatus for, setting an operating (control) voltage of a voltage controllable optical component, such as a Mach-Zehnder optical modulator, having a periodic voltage/optical parameter (optical power) characteristic include an up/down counter and a digital to analog converter operable to set the voltage applied to the component to a predetermined initial value, a device for measuring the optical parameter, and another device for sequentially progressively increasing and decreasing the voltage (incrementing/decrementing the counter) with respect to the predetermined value, and for determining respective voltage values which produce maximum and minimum values of the optical parameter. The voltage is set to a value intermediate the maximum and minimum voltage values. Further, the apparatus determines the sense of the slope of that portion of the periodic characteristic lying between the maximum and minimum values for use by a control loop during subsequent operation of the optical component.
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Butler Graham
Leach Michael
Livermore Peter James
Vass Darren
Dinh Jack
Epps Georgia
Kirschstein et al.
Marconi UK Intellectual Property Ltd.
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