Theory of coupled optoelectronic microwave oscillator I: expectation values

Multi-cavity optoelectronic oscillators using multicore fibers

“…A distinctive feature of this OEO, which follows from Eq. (19), is the possibility of tuning the oscillation frequency by changing Δλ, in other words, by using a tunable laser. For the example considered above, the specific relationship is f o = 200 GHz / Δλ, where Δλ is expressed in (nm).…”

“…To combat this limitation, several solutions have been proposed to refine and improve the performance of OEOs, including the incorporation of a highly selective whispering gallery optical filter in the optical segment of the oscillator [12] that can lead to extremely compact [13], broadly tunable [14] and low phase noise [15] devices with the possibility of exploiting as well opto-mechanical effects [16]. Coupled optoelectronic oscillators (COEOs), which simultaneously produce spectrally pure microwave signals as in a OEO and short optical pulses as in a mode locked laser, have also been proposed and actively researched during the last years [17][18][19][20]. Finally, multi-cavity or multiloop OEOs have been proposed [21], where a long cavity provides the required spectral purity and a short fiber cavity provides the required spectral separation between adjacent oscillating modes, what alleviates the narrowband requirement for the internal RF filter.…”

Theory of coupled optoelectronic microwave oscillator II: phase noise

“…This paper expands the study of the expectation parameters of the COEO presented in our previous paper [30]. We have developed a formalism to find the phase noise of the COEO using methods developed to describe the noise of mode-locked lasers [10,31,32].…”

Kerr frequency comb-based K<inf>a</inf>-band RF photonic oscillator

“…It is known that Coupled Opto-Electronic Oscillators (COEO) allow achieving phase noise much lower compared with phase noise of conventional OEOs having the same length of optical fiber involved [9]- [13]. A COEO is a regenerative device that involves both optical and RF gain (active optical and RF loop), while OEO has a passive optical loop and active RF loop.…”