10 June 1994 Low-loss fiber optic time-delay element for phased-array antennas
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We present a novel concept, the fiber optic Bragg grating true- time-delay (TTD) element, for implementing true time delay in the distribution network of an optically fed phased array antenna. the device utilizes narrowband optical Bragg reflection gratings written holographically into the core of a single-mode fiber at various positions along its length. An optical carrier is modulated by the RF signal of interest and launched into this delay-line fiber. The desired RF time delay may be realized by wavelength-selectable nature of the TTD device offers the possibility for simplified beamsteering control and channel multiplexing.
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Lawrence J. Lembo, Lawrence J. Lembo, Terry L. Holcomb, Terry L. Holcomb, Michael G. Wickham, Michael G. Wickham, Philip H. Wisseman, Philip H. Wisseman, John C. Brock, John C. Brock, } "Low-loss fiber optic time-delay element for phased-array antennas", Proc. SPIE 2155, Optoelectronic Signal Processing for Phased-Array Antennas IV, (10 June 1994); doi: 10.1117/12.177398; https://doi.org/10.1117/12.177398

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