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Express"],"published-print":{"date-parts":[[2026,10,5]]},"abstract":"<jats:p>Phased array transmitters often operate in contested electromagnetic environments. To achieve secure transmission and low probability of intercept operation, flexible beam control and generating a null to reduce radiation toward undesired directions are critical. In this work, a wideband optically controlled phased-array (OCPA) transmitter with flexible and independent control of the main lobe and null from a system control perspective is proposed. The proposed system integrates a spatial filter module consisting of an optical true-time delay network and balanced photodetectors. Simulation results for a 16-element OCPA based on the proposed architecture demonstrate that the main lobe and null can be scanned over a range of at least \u00b140\u00b0 while maintaining a null depth greater than 50\u2005dB. A proof-of-concept experiment is further carried out using a 5-element OCPA transmitter. 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