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19 August 2003 Optical beamforming in receive mode of two independent simultaneous RF beams
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We propose and demonstrate a novel architecture for a programmable dispersion matrix (PDM) able to process two simultaneous independent RF beams with a resolution of 3 bits. The processor takes advantage of wavelength division multiplexing (WDM) encoding. In our two-channel approach, four adjacent ITU optical WDM channels are used as optical carriers. The odd and even optical carriers are independently modulated with each received RF-beam using electro-optic modulators. Thus, each pair of optical carriers directs RF information of one beam. The PDM is programmed to introduce independent true-time delays for even and odd optical channels. The PDM is based on three optical delay lines, arranged in a binary configuration. Each delay line consists of four fiber-Bragg gratings (FBG), with each FBG having a center-wavelength at one of the optical WDM channels. Beampatterns are characterized in receive mode for RF signals in 0.5-1.5 GHz frequency range obtained for target angles of 0° to 70°. The measurement results demonstrate the simultaneous processing of two received RF-beams and the squint free nature of the beamformer.
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Mark Jaeger, Sergio C. Granieri, and Azad Siahmakoun "Optical beamforming in receive mode of two independent simultaneous RF beams", Proc. SPIE 5247, Optical Transmission Systems and Equipment for WDM Networking II, (19 August 2003);

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