We present integrated optical phased arrays with cascaded phase shifting architectures for easy and effective electronic control. The input light is distributed to N emitters equally through a cascaded 1×2 splitter network with log2N stages and with identical phase shifters on each stage, which enables continuous beam steering using log2N voltages or one voltage. A 32-element SiN OPA with one input voltage was measured to exhibit 16° continuous steering at 13-V bias with 0.7° beam width. The same design can be easily adjusted for large element OPAs with easy and effective electronic control.
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