Analysis of a coherent optically controlled phased-array antenna system

Ligeng Xu; Stephen R. Forrest

doi:10.1117/12.177405

10 June 1994 Analysis of a coherent optically controlled phased-array antenna system

Ligeng Xu, Stephen R. Forrest

Proceedings Volume 2155, Optoelectronic Signal Processing for Phased-Array Antennas IV; (1994) https://doi.org/10.1117/12.177405
Event: OE/LASE '94, 1994, Los Angeles, CA, United States

Abstract

We analyze a true-time delay, optically controlled phased array antenna system whereby beam forming is accomplished using a large number of antenna elements that can receive any of several different microwave true-time-delays via use of coherent optical carriers through a single transmission fiber. We calculate the SNR and the signal-to-interchannel interference ratio (SIR) of one channel for various modulation-demodulation schemes. We show that for AM modulation, with a bandwidth of 1 MHz, a transmitter power of -10 dBm and a laser linewidth of 1 MHz, we can obtain a dynamic range (DR) of approximately 46 dB, with a channel separation six times of that of the microwave oscillation frequency. For the FM scheme, DR is approximately equal to 60 dB for a laser linewidth of 1 MHz, a FM modulation index of 2 and a channel spacing of 12f_m. It is found that coherent optically controlled phased array antennas provide improved controllability, and can have the SNR and DR that meet the stringent requirements of high resolution microwave antenna systems.

Citation Download Citation

Ligeng Xu and Stephen R. Forrest "Analysis of a coherent optically controlled phased-array antenna system", Proc. SPIE 2155, Optoelectronic Signal Processing for Phased-Array Antennas IV, (10 June 1994); https://doi.org/10.1117/12.177405

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