Electro-Optical Beamforming Network for Phased Array Antennas.
Patent, Filed 30 Sep 86, patented 19 Apr 88,
DEPARTMENT OF THE AIR FORCE WASHINGTON DC
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A fiber optic device 50 designed to steer the radiation beam of a phased-array antenna 10 has been demonstrated. A radio frequency RF signal is generated via photomixing at the output of a single-mode fiber optic interferometer. The phase of the electrical signal is shifted over several cycles in direct proportion to a voltage applied to an optical modulator 34, 60. The modular consists of a Pockels-type optical phase modulator located in one arm of the heterodyne interferometer. Rapid changes in RF phase are feasible. A miniature low-voltage version of the device 50,72, based upon integrated optics, has been devised.
- Electrooptical and Optoelectronic Devices