Abstract
Low noise microwave source is essential for many subjects, including radar, communication, test instrumentation, and sensing. Photonic-based optoelectronic oscillator (OEO) can address some challenges faced by electronic oscillators, including phase noise performance, and wideband frequency tunability. However, a scaling challenge for the OEO is the frequency control, including long-term stability, frequency resolution, frequency accuracy and frequency settling time. In this paper, an ultra-low phase noise and frequency agile X-band frequency synthesizer based a phase locked OEO and a direct digital synthesizer is proposed and experimentally demonstrated. Single-sideband (SSB) phase noise of −139 dBc/Hz at 10 kHz offset and frequency switching time of 176 ns are achieved.
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