Coupling of high-quality-factor optical resonators

Abstract

We improve theoretically and experimentally the problem of the coupling between a high Q-factor resonator and its external coupler. We have observed oscillations of ringing induced by the sweeping of the excitation frequency of an active microsphere. Thanks to this approach, the quality factor of an optical resonator was measured and we obtained Q = 5.8 × 10 8 .

Fiber to resonator coupling multicriteria optimization with COMSOL multiphysics

“…We look at the coupling between a thin fiber and a resonator. One can refer for the coupling of resonators to a paper, which concerns another type of resonator, the micro-spheres [7]. We can make some analogies between the propagation of an optical signal and that of a microprobe signal along a coplanar line [19].…”

Frequency and temperature control for complex system engineering in optoelectronics and electronics: an overview

“…It may be a sphere [12,13], but also a disk or what matters is the propagation of the signal at its periphery, either because the disk is of toroidal type [14], or because the radius of curvature of its slice is sufficiently small. To couple the optical signal to the optical resonator, it is necessary to ensure a coupling of the evanescent type [15][16][17]. It is then necessary to remain at an optimal distance from the resonator to allow both the transmission of a part of the signal but also the coupling to the resonator.…”

Celebration of the centenary of a major scientific milestone thanks to Heinrich Barkhausen

“…Every researcher and engineer who works on oscillators knows that it is essential to meet the Barkhausen criteria before being able to start an oscillator. An example is given through these references corresponding to work on crystal oscillators and other types of optoelectronic oscillators [2][3][4][5][6]. This does not guarantee that the oscillator will be stable and that the oscillation will continue, but it is an essential part.…”