Abstract
A high Q-factor optoelectronic oscillator (OEO) based on an active recirculating delay line and a dual-loop topology is proposed and demonstrated experimentally. The implemented OEO provides a very stable oscillation at 5.4 GHz with a sub-Hz 3-dB bandwidth and a $Q$ -factor in excess of $10^{10}$ . A single side-band phase noise of −74 dBc/Hz is measured at 10 kHz offset, while side modes are significantly suppressed for offset values in the range of 100 kHz–1 MHz.
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