Bangert, A.A.BangertLudwig, M.M.Ludwig2022-03-032022-03-031991https://publica.fraunhofer.de/handle/publica/17983110.1109/MWSYM.1991.147046For the first time the optical injection locking behavior of a monolithic integrated HFET-oscillator has been investigated. The monolithic integration is an important step towards the implementation of optically controlled oscillators in phased array antenna systems. The oscillators was designed to operate at 8 GHz. The gate and source terminals of the HFET were biased at 0 volt through coplanar lines, which also served as a feedback and resonator circuit. The active region of the device was illuminated by a pigtailed laser diode modulated at about 8 GHz so that the oscillator circuit could be optically injection locked. The experimental results show the optical locking behaviour of the oscillator. A direct comparison between optical and electrical injection locking is possible.enHEMTMMICoptical injection lockedoptical phase controloptically controlled microwave devicesoptisch gesteuerte Mikrowellenbauweiseoptische Injektions-Synchronisationoptische Phasensteuerung621667journal article