Communications: directive radio wave systems and devices (e.g. – Directive – Including a steerable array
Patent
1994-10-03
1996-04-30
Issing, Gregory C.
Communications: directive radio wave systems and devices (e.g.,
Directive
Including a steerable array
342368, H01Q 322
Patent
active
055129072
ABSTRACT:
An optical beamsteering system for providing a plurality of respectively time-delayed optical signals to control a phased array of transducer elements or the like includes an optical signal processing system having a plurality of optical time delay units optically coupled together in a cascade. In each optical time delay unit includes a respective multiple-pass optical delay path apparatus in which respective optical signals passing through the delay path apparatus pass along either a direct path or a delay path dependent upon the polarization orientation of the light. The delay path apparatus includes optical components disposed such that optical signals passing along the delay path pass through a given fiber delay line twice before passing from the multiple-pass optical time delay unit so as to cancel out any uncommanded polarization shifts resulting from passage of the optical signal through the fiber.
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D. Dolfi et al., "Two-Dimensional Optical Architecture for Time-Delay Beam Forming in a Phased-Array Antenna," Optics Letters, vol. 16, No. 4, Feb. 15, 1991, pp. 255-257.
D. Dolfi et al., "Optically Controlled True Time Delays for Phased Array Antenna," Optical Technology for Microwave Applications IV, SPIE vol. 1102, 1989, pp. 152-161.
Dolfi et al. "Optically Controlled Time Delays for Phased Array Antenna", Optical Technology for Microwave Appl. IV, SPIE vol. 1102, 1989.
General Electric Company
Ingraham Donald S.
Issing Gregory C.
Snyder Marvin
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