Abstract

By treating a regeneratively mode-locked laser with a short ring length of 5.85 m as a coupled optoelectronic (OE) RF oscillator, the microwave quality factor (${{\rm Q}_{{\rm RF}}}$) of its ring-cavity was characterized with the phase-shift approach. Specifically, the phase shift in the OE feedback loop of the mode-locked laser was varied, and the corresponding frequency shift in the photodetected first harmonic of its emitted pulse train was measured. An optical-gain enhanced ${{\rm Q}_{{\rm RF}}}$ of  ${\sim}{5.8} \times {{10}^4}$ was measured, which is an order of magnitude larger than the ${{\rm Q}_{{\rm RF}}}$ estimated for the same cavity before regenerative mode-locking. The experimental results were then compared with theoretical models developed to estimate the optical-gain enhanced ${{\rm Q}_{{\rm RF}}}$ of coupled OE oscillators.

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