Abstract
Semiconductor ring resonators as the core components of instruments
and devices have found applications in the areas of telecommunications and
sensors. In this study, the feasibility of using ring resonators as solid-state
angular rate sensors (gyroscopes) based on the Sagnac effect is assessed,
and an extensive analysis of the optimal values of resonator length, coupling,
and detuning is carried out, for the drop port of a double-bus ring, and for
an all-pass, single-bus ring, for different values of propagation losses,
consistent with different available technologies. We show that for both the
all-pass and the drop-port configurations, optimally undercoupled rings show
larger extinction ratios and, thus, better resolutions than critically coupled
rings of the same length, contrary to our initial intuitive assumption that
critically coupled rings should offer the best resolutions. Our analysis also
shows that the ring resonator gyroscopes require a technology-constrained
optimization, with the propagation loss as the main factor that hinders the
resolution, and that determines the optimum values of all other parameters,
namely length, coupling, and resonance detuning. According to our model, standard-chip-sized
racetrack gyroscopes are suitable for rate- and tactical-grade applications
for selected, currently feasible low propagation loss waveguides.
© 2012 Crown
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