Modulator bias control

Details Modulator bias control Modulator bias control

2008-05-06

2008-05-06

Stultz, Jessica T (Department: 2873)

Optical: systems and elements

Optical modulator

Light wave temporal modulation

C359S238000, C359S307000

Reexamination Certificate

active

07369290

ABSTRACT:
Approaches to bias control are disclosed for an optical modulator that modulates an optical carrier with a data input signal. In one embodiment an electrical bias input signal provided to the modulator is adjusted based on a characteristic of the data input signal detected from the modulated optical output signal. Another embodiment injects an additive dither signal into an optical modulator receiving a data input signal having a modulation depth of at least on the order of 50%. These embodiments can obtain and maintain a correct bias point on a modulator's transfer function curve when the modulation signal has a modulation depth on the order of 100%.

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