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US 2009/0154940 A1Published application
Balanced optical signal processor
AssigneeAlcatel Lucent
InventorsYoung-Kai Chen, Andreas Bertold Leven, Mahmoud Rasras, Kun-Yii Tu
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Abstract
An apparatus and method for reducing electrical signal intermodulation by processing a balanced electrical signal in the optical domain in a manner adapted to reduce noise and second order intermodulation, and converting the processed optical signal back to an electrical domain signal with either a single or balanced (differential) outputs.
Claims24
An optical signal processor, comprising:
- an optical modulator, for modulating an optical carrier signal according to a balanced electrical baseband signal, to provide thereby a pair of first and second complementary phase modulated optical signals;
- an optical coupler, for mixing said pair of complementary phase modulated optical signals with a photonic local oscillator signal, to provide thereby first and second pairs of mixed complementary phase modulated optical signals;
- a first balanced detector for processing the first pair of mixed complementary phase modulated optical signal, and providing thereby a first optical intensity difference signal;
- a second balanced detector for processing the second pair of mixed complementary phase modulated optical signal, and providing thereby a second optical intensity difference signal;
- and
- a trans-impedance amplifier, for receiving each of the first and second optical intensity difference signals, and providing thereby an electrical signal representative of the balanced electrical baseband signal.
3 more elements
A coupler, comprising:
- a first input section for detecting first and second input signals;
- a second input section for detecting a local oscillator signal;
- and
- an output section for providing first, second, third, and fourth output signals;
- wherein the first and second input signals are mixed with the local oscillator signal in a manner tending to reduce noise and second order intermodulation in the first, second, third and fourth output signals.
2 more elements
A method, comprising:
- modulating an optical carrier signal according to a balanced electrical baseband signal, to provide thereby a pair of complementary phase modulated optical signals;
- mixing said pair of complementary phase modulated optical signals with a photonic local oscillator signal, to provide thereby first and second pairs of mixed complementary phase modulated optical signals;
- detecting the first and second pairs of mixed complementary phase modulated optical signals and providing first and second optical intensity difference signal;
- and
- converting the first and second optical intensity difference signals into an electrical signal representative of the balanced electrical baseband signal.
2 more elements
A method, comprising:
- modulating an optical carrier signal according to a balanced electrical baseband signal, to provide thereby a pair of complementary amplitude modulated optical signals;
- mixing said pair of complementary amplitude modulated optical signals with a photonic local oscillator signal, to provide thereby first and second pairs of mixed complementary amplitude modulated optical signals;
- detecting the first and second pairs of mixed complementary amplitude modulated optical signals and providing first and second optical intensity difference signal;
- and
- converting the first and second optical intensity difference signals into an electrical signal representative of the balanced electrical baseband signal.
2 more elements
Dependencies are inferred from the claim text.