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US 2003/0080899 A1Published application
Phased array antenna using gain switched multimode fabry-perot laser diode and high-dispersion-fiber
AssigneeKWANGJU INSTITUTE OF SCIENCE AND TECHNOLOGY of Republic of KOREA
InventorsYong-Tak Lee, Jung Hye Chae
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Abstract
The present invention is about phased array antenna using gain switched multimode Fabry-Perot laser diode (FP-LD) and high-dispersion fiber. More particularly, the invention deals with techniques that allow compact and low-cost system implementation for phased array antenna adopting optical control and also allows continuous time delay for each antenna in the array to induce phase difference.
Claims5
A phased array antenna characterized to comprise;
- multimode Fabry-Perot laser diode generating optical pulses by gain switching,
- high-dispersion fiber in which carries previously stated optical pulses and generates microwave signal by separating each mode of previously stated multimode Fabry-Perot laser diode,
- power splitter distribution of previously stated mode-separated optical pulse train into number of antennas in the array to send the pulse signal to the antenna array,
- time delay line which causes phase difference for different time delay respectively by passing previously stated distributed optical pulses through different length of non-dispersive fiber respectively,
- photodetector which photo-electrically converts previously stated optical pulses having phase difference,
- optical amplifier amplifying previously stated photo-electrically converted optical pulses, and
- antenna array transmitting previously stated amplified optical pulses.
4 more elements
Dependencies are inferred from the claim text.