Method and apparatus for asymetrical optical modulation
AssigneeBig Bear Networks, Inc.
InventorJonathan Paul King
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Abstract
An optical data transmission system using a Mach Zehnder (M-Z) modulator asymmetrically modulates the optical carrier to generate control information to optimize the transmitted optical signal.
Claims20
A method of biasing an optical modulator comprising the steps of:
- modulating one or more control tones asymmetrically onto an optical carrier producing an optical data stream;
- processing said optical data stream to generate an error signal;
- and
- adjusting said modulating step as directed by said error signal.
A system for biasing an optical modulator comprising:
- an optical modulator for modulating one or more control tones onto an optical carrier generating an optical data stream;
- a monitor coupled to said optical data stream and generating an error signal;
- and
- a bias generator coupled to said error signal generating a bias signal coupled to said optical modulator.
The systems of clams 11, 12, 13, or 14 wherein said optical modulator modulates said one or more control tones substantially on the ‘0’ level of said optical data stream.
The systems of clams 11, 12, 13, or 14 wherein said optical modulator modulates said one or more control tones substantially on the ‘1’ level of said optical data stream.
Dependencies are inferred from the claim text.