Title :
Fiber Bragg-grating true time-delay systems: discrete-grating array 3-b delay lines and chirped-grating 6-b delay lines
Author :
Molony, Anna ; Zhang, Lin ; Williams, John A R ; Bennion, Ian ; Edge, C. ; Fells, J.
Author_Institution :
Dept. of Electr. & Electron. Eng. & Appl. Phys., Aston Univ., Birmingham, UK
fDate :
8/1/1997 12:00:00 AM
Abstract :
We describe wavelength-addressed 3- and 6-b fiber-optic true time-delay (TTD) lines implemented using ultraviolet-inscribed Bragg gratings. The 3-b delay line is fabricated from an array of discrete- and uniform-period Bragg gratings, and a minimum time delay of 9.09 ps is selectable, making it suitable for phased-array antenna (PAA) beamforming control at RF frequencies of up to about 3 GHz with 10° phase resolution. The 6-b delay line is fabricated using a chirped-period Bragg grating, and is suitable for beamforming control at RF frequencies of up to ~48 GHz, with 10° phase resolution
Keywords :
antenna accessories; antenna phased arrays; array signal processing; diffraction gratings; microwave antenna arrays; millimetre wave antenna arrays; optical delay lines; optical fibres; 3 GHz; 48 GHz; EHF; SHF; beamforming control; chirped-grating delay lines; discrete-grating array delay lines; fiber Bragg-grating; phased-array antenna; true time-delay systems; ultraviolet-inscribed Bragg gratings; wavelength-addressed delay lines; Array signal processing; Bragg gratings; Chirp; Delay effects; Delay lines; Fiber gratings; Optical crosstalk; Optical fiber networks; Optical fibers; Radio frequency;
Journal_Title :
Microwave Theory and Techniques, IEEE Transactions on
