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This paper presents a method to perform in the opti-
cal domain the correlations required when processing millimeter
wave interferometric radiometer signals. The main problem when
addressing the design of an interferometric radiometer working
at W-band resides on the distribution and correlation of large
bandwidth signals acquired by each radiometer receiver. In order
to avoid the necessity of baseband processing of signals with large
relative bandwidths, the signals coming from the radiometric
receivers are up-converted to the optical domain using LiNbO3
optical phase modulators. The modulated signals from each
receiver pairs are added and and detected by a photodiode. The
correlation is obtained from the resulting photocurrent.
CitationNova, E. [et al.]. Optical cross-correlation of millimeter wave signals applied to interferometric radiometry. A: International Conference on Infrared, Millimeter, and Terahertz Waves. "IRMMW-THz 2011: 37th International Conference on Infrared, Millimeter, and Terahertz Waves, 23rd- 28th September 2012, Wollongong, Australia". Wollongong: IEEE, 2011, p. 1-2.
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