17 January 2005 Integrated high-speed digital optical true-time-delay module for synthetic aperture radars
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This paper provides a description of the research for the development of an integrated high speed true-time-delay module for synthetic aperture radars. The unique feature of the approach is that the true-time-delay waveguide circuit and electro-optic switching elements are integrated. As a result this integration significantly reduces the device size while simplifying the difficult packaging problem associated with the interfaces between optical fibers and optical switches. Such a monolithic approach provides greater precision for the RF phase control that the phase control provided by fiber-delay-lines as a result to the submicrometer accuracy of lithography-defined polymeric waveguides. More importantly, the optical switched true-time-delay network requires less electrical power due to the low power consumption of electrically-switchable waveguide gratings. Furthermore, the electrically-switchable waveguide gratings have a very fast switching speed (<50 μs) that is at least 100 time faster than any existing commercial optical switching matrix.
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James Foshee, James Foshee, Suning Tang, Suning Tang, Jennifer Colegrove, Jennifer Colegrove, Yuanji Tang, Yuanji Tang, Jibing Lin, Jibing Lin, Xuping Zhang, Xuping Zhang, } "Integrated high-speed digital optical true-time-delay module for synthetic aperture radars", Proc. SPIE 5644, Optoelectronic Devices and Integration, (17 January 2005); doi: 10.1117/12.568952; https://doi.org/10.1117/12.568952

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