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19 August 2003 Photonic delay lines: technology trends and challenges
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The use of photonics for phased array antenna (PAA) control is a vital area of applied research. In particular, the potential impact of compact, low cost, photonically controlled PAAs for large scale global applications, such as wireless communications, is a major business growth area. This paper presents an overview of technology approaches for photonic delay lines (PDLs) as well as the challenges. Polarization based switched PDLs using two-dimensional (2D) liquid-crystal devices are discussed. In particular, 2-D ferroelectric liquid crystal devices are used as polarization switches in PDLs to control and process optical signals. The experimental demonstration of a multichannel 7-bit PDL system for a wideband PAA such as the Navy's advanced Aegis radar system is presented. Finally, we present novel approaches for hardware and control complexity reduction. One hardware compression approach is based on ternary PDL designs and wavelength division multiplexing. The other approach is based on the Dingel-resonator which functions as a novel prism-like optical device using Gires-Tournois Resonator (GTR) whose front surface mirror is coated with pre-defined spatial reflectivity profile.
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Nicholas Madamopoulos and Benjamin B. Dingel "Photonic delay lines: technology trends and challenges", Proc. SPIE 5247, Optical Transmission Systems and Equipment for WDM Networking II, (19 August 2003);

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