Title :
Optical beamforming network based on chirped fiber gratings continuously variable true-time-delay lines
Author :
Corral, J.L. ; Marti, J. ; Fuster, J.M.
Author_Institution :
ETSI Telecommun., Valencia, Spain
Abstract :
A novel approach of true-time delay optical feeder for phased-array antennas is proposed and demonstrated. A compact size continuously variable true time delay unit is achieved by employing a reduced tuning-range tunable laser and one wide bandwidth chirped fiber grating as dispersive element. The dispersion-induced distortion and bandwidth limitation have been studied and two different optical modulation schemes (AM, SSB+C) have been considered and measured, proving to solve the mentioned effects. A high resolution performance (5.3 ps) is obtained employing narrow tuning bandwidth lasers with a wavelength stability of 0.005 nm and a 4 nm bandwidth chirped grating.
Keywords :
antenna feeds; antenna phased arrays; array signal processing; chirp modulation; diffraction gratings; optical delay lines; optical fibres; optical information processing; 5.3 ps; AM; SSB+C; bandwidth; chirped fiber grating; dispersive element; distortion; optical beamforming network; optical feeder; optical modulation; phased array antenna; true-time-delay line; tunable laser; Array signal processing; Bandwidth; Chirp; Fiber gratings; Laser tuning; Optical beams; Optical distortion; Optical fiber networks; Optical modulation; Optical network units;
Conference_Titel :
Microwave Symposium Digest, 1998 IEEE MTT-S International
Conference_Location :
Baltimore, MD, USA
Print_ISBN :
0-7803-4471-5
DOI :
10.1109/MWSYM.1998.700631