7 September 2000 Broadband high-power photodetector arrays for photonically implemented phased-array antenna architectures
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Abstract
The authors present a monolithically integrated photodetector array combiner approach that operates over an extremely wide RF bandwidth. These arrays are suitable for coherent RF signal combining applications such as optically controlled phased array radar. The approach consisted of a monolithically integrated array of high-power, wideband photodetectors distributed along an RF transmission line resulting in a low power consumption, broadband, high power handling optical-to-RF combiner, The authors demonstrated a 4-element photodetector array with a small-signal 3dB bandwidth of 34 GHz. RF models were developed and calibrated to the measured results to predict the performance of larger arrays. The models predict than an 8-, 16-, and 48-element array would have a small-signal 3dB bandwidth of 25 Ghz, 15.7GHz, and 5.8GHz respectively. These arrays showed a reasonable amount of robustness to variations and/or errors in the time delays of the input optical feed network suggesting that implementation outside the laboratory should be practical.
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David C. Scott, Timothy A. Vang, James E. Leight, David V. Forbes, Karen Everett, Fernando D. Alvarez, Roosevelt Johnson, John C. Brock, Lawrence J. Lembo, "Broadband high-power photodetector arrays for photonically implemented phased-array antenna architectures", Proc. SPIE 4112, Radio Frequency Photonic Devices and Systems, (7 September 2000); doi: 10.1117/12.399379; https://doi.org/10.1117/12.399379
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