Study of reconfigurable microwave photonics multi-beamforming technology
A reconfigurable multi-beamforming technology scheme based on optical true time delay and optical switch array was proposed to achieve the reconfiguration between multiple radio frequency(RF)signals and multiple beams in the microwave photonic multi-beamforming system.The scheme includes electro-optical conversion,optical switch array,multibeam splitter array,fixed optical true time delay array,and photoelectric conversion.The working principle and reconfiguration mechanism of the proposed scheme were theoretically analyzed.A simulation system was established to evaluate the performance of reconfiguration between four RF signals and fixed four beams based on the 4-port Benes network and to obtain the beam pattern under various configured states.The results indicate that the proposed scheme reduces the number of optical switches required by about 2 orders of magnitude compared to the scheme based on variable optical true time delay.The cost can be decreased,and complexity of the system can be controlled at the same time.The reconfiguration between four RF signals and four beams is realized,and a new approach for the application of multi-beamforming technology is provided.
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