Fiber-Optic, Wideband Array Antenna Beamformer
Abstract
This is a technique using a fiber-optic, wideband array antenna beamformer having cascaded, chirped fiber gratings in a distributed architecture based upon the use of cascaded, fiber-optic, chirped Bragg gratings in a distributed architecture for use in wideband, time-steered array antennas. A wavelength tunable laser serves as a carrier for a microwave signal which is modulated upon it. The signal is corporately distributed to each feed of the array. Each feed then traverses a multi-port optical circulator and is reflected off a number of identical, chirped fiber gratings proportional to their position within the array. The signal is then demodulated and fed to the appropriate antenna element. All gratings are identical with the same length and dispersion (ps/nm). Time-steering is accomplished by tuning the laser wavelength such that the effective reflection point in an individual grating is changed due to the chirped nature of the grating.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jun 09, 2000
- Accession Number
- ADD019766
Entities
People
- Paul J. Matthews
Organizations
- United States Department of the Navy