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Characterization of a ferroelectric liquid crystal-based time delay unit for phased array antenna applications

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2 Author(s)
Riza, Nabeel A. ; Centre for Res. & Educ. in Opt. & Lasers, Central Florida Univ., Orlando, FL, USA ; Madamopoulos, N.

An experimental demonstration of a photonic time delay unit (PTDU) based on ferroelectric liquid crystal devices and Thompson polarization beamsplitters (TBSs) is presented. High signal-to-noise ratios (SNRs) (>96 dB) and optical polarization extinction ratios (ER,~40 dB) are demonstrated for the PTDU using an active noise filter technique. Using a 5 V peak square wave switch drive signal, a 70 μs switching speed is demonstrated for this PTDU that can be used in fast (e.g., 5000 beam/s) beam scanning phased array systems. A shorter switching speed of 35 μs is also observed using a high 15 V peak transitional voltage driving signal

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Lightwave Technology, Journal of  (Volume:15 ,  Issue: 7 )