Abstract
Optical true time-delay (TTD) feeder for phased-array antennas (PAAs) offers many advantages such as small size, low loss, wide-bandwidth, and no Electro-Magnetic Interference (EMI), etc. Several schemes for optical TTD feeder have been proposed such as a fiber-optic prism using high dispersion compensation fibers (DCFs),1 integrated silica waveguide switches,2 fiber Bragg gratings (FBGs),3 and chirped fiber gratings (CFGs).4–5 Among these, FBGs, integrated silica waveguides, and DCFs can offer discrete beam scanning capability, on the other hand CFGs can offer continuous beam scanning capability. Most of the optical TTD feeders described above, however, require tunable or multi-wavelength sources to operate, resulting in higher system costs, longer time to reach a steady-state, and extra control for wavelength adjustment, etc.
© 2002 Optical Society of America
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