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23 October 1997 Micro-optic photonic time shifters based on switched gratings
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Abstract
Switched-volume-diffraction gratings are used to form free- space optical time delay systems with digitally selectable delays. In these systems, a cascade of n independently controlled gratings provides 2' evenly spaced time delay paths. An important feature of the approach described here is that the technology allows the use of compact micro-optic packaging, which in turn allows independent time delay channels to be tightly stacked. In one such scenario, the optical system for 75 5-bit optical time delay modules, each with a maximum selectable time delay of 1 ns, can be packed in a 3-inch cube. Recent results of theoretical modeling and experiments are presented which show that these systems have potential for excellent channel isolation, crosstalk suppression, and low insertion loss. Optical systems are discussed in the context of phased array applications: various configurations are described, including a multi-pass entire array driver that may replace many single channel time shifters with a single optical system.
© (1997) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Thomas W. Stone, Michelle S. Malcuit, Jeffrey A. Kleinfeld, and John C. Kralik "Micro-optic photonic time shifters based on switched gratings", Proc. SPIE 3160, Optical Technology for Microwave Applications VIII, (23 October 1997); https://doi.org/10.1117/12.283942
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