A Coherent, Optically Controlled Phased Array System.
Final rept. Jan 93-Jul 96,
PRINCETON UNIV NJ DEPT OF ELECTRICAL ENGINEERING AND COMPUTER SCIENCE
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An optically controlled microwave phased array antenna system is analyzed. Beamforming is accomplished with a large number of antenna elements that can receive any of several different true-time delays from a single fiber using multi-channel optical heterodyne techniques. System performance such as signal to noise ratio, signal to interchannel interference ratio, and dynamic range DR for various modulation-demodulation schemes i.e. AM, FM, and PM are quantitatively analyzed. An experimental system insensitive to laser linewidth arid IF frequency instabilities is demonstrated. Accurate true-time delay is demonstrated across the L band 0.8 to 1.5 GHz. The DR for one channel is 52 dBMHz. For a narrow channel spacing of 1 angstrom at 1.55 micrometers, the interchannel interference is -50dB. Also, monolithic photonic integration using vertical twin-waveguide TG structure based on single-step MBE grown InPInGaAsP material is studied as a means of practical implementation of large scale photonic systems. Finally, high efficiency, high power semiconductor lasers employing a 1.5 micron InGaAsPInP separate confinement multi-quantum well structure, are investigated for use in high DR, high density RF-optical links.
- Electrical and Electronic Equipment
- Lasers and Masers
- Fiber Optics and Integrated Optics