Modulator control system

Optical: systems and elements – Optical modulator – Light wave temporal modulation

Reexamination Certificate

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Details

C359S238000, C359S239000

Reexamination Certificate

active

10545666

ABSTRACT:
An optical communications system comprising: an optical input and an output, a source of input signals in an asymmetric format and having a duty cycle, a modulator for modulating the input signals, to produce an asymmetric signal, the modulator comprising a Mach-Zehnder interferometer; drive means for driving the modulator at a predetermined modulator drive voltage; bias means for applying a bias voltage to the modulator; adjustment means for adjusting a first variable chosen from one of the bias voltage, gain voltage, or duty cycle in response to the relationship existing between changes in the amplitude of the asymmetric signal and changes in the first variable, characterized in that the system further comprising varying means for varying a second variable, different to the first variable and chosen from one of the bias voltage, gain voltage or duty cycle in response to adjustments made to the first variable; and a monitor for recording the average optical output power.

REFERENCES:
patent: 6374000 (2002-04-01), Olesen
patent: 6473219 (2002-10-01), King
patent: 2002/0075550 (2002-06-01), Olesen
patent: 2002/0114047 (2002-08-01), McBrien et al.
patent: 2002/0171903 (2002-11-01), Walklin
patent: 2003/0007231 (2003-01-01), Winzer

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