Wideband all-optical BEAMTAP

Hardware Demonstration of Extremely Compact Optical True Time Delay Device for Wideband Electronically Steered Antennas

“…Free-space approaches typically use a series of spatial light modulators to select the paths for arrays of beams [18]- [20] or acousto-optic modulation [21], [22]. The advantage of free space is low weight and equal ease of implementing long and short delays.…”