Abstract
A low-loss and compact optical delay element is devised to be integrated into
existing White cell-based true-time delay systems. The delay element is based on a
μltiple-bounce cell that consists of simple optical components, which was initially
described by Claude Robert for spectroscopy. We hereby provide a comprehensive analysis
of the Robert cell and propose that it can be modified in a number of ways to produce
discrete and variable time delays up to hundreds of ns. The Robert cell show appealing
traits compared to traditional optical delay devices because it relies on reflections
within a system of mirrors to produce time delays, and this mechanism reduces the
physical size and optical losses compared to traditional approaches for long delays. We
also illustrate how modified Robert cells can be designed such that they can be
compatibly combined with White cell-based true-time delay systems.
© 2012 IEEE
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