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True time-delay phased-array antenna feed system based on optical heterodyne techniques

1996; Institute of Electrical and Electronics Engineers; Volume: 8; Issue: 1 Linguagem: Inglês

10.1109/68.475812

1941-0174

Ligeng Xu, Richard Taylor, Stephen R. Forrest,

Advanced Photonic Communication Systems

We demonstrate a true-time delay phased-array antenna feed system based on multi-channel optical heterodyne detection techniques. The system is relatively insensitive to laser linewidth and IF frequency instabilities. We demonstrate accurate true-time delay from 0.8 to 1.5 GHz. The dynamic range for one channel is 52 dB for 1 MHz bandwidth. For a very narrow channel spacing of 13 GHz (/spl sim/1 /spl Aring/ at a transmission wavelength of 1.55 μm), the interchannel interference is negligible. Such an architecture has potential for large scale system implementations.