Abstract

In this paper we study a multi-ring resonant structure including three evanescently coupled ring resonators (named triple ring resonator,TRR), with different ring radii and coupling coefficients, and coupled to two bus waveguides. The potential application of a TRR as a rotationsensor is analyzed and its advantages over a single ring resonator (SRR) under rotation conditions are also highlighted. When the coupledrings have different size and their inter-ring coupling coefficients are lower than the ring-bus coupling coefficients, the resonance frequencydifference between two counter-propagating beams induced by rotation is enhanced with respect to that of a single ring resonator (SRR)with the same footprint. The scale factor of the rotating TRR, which depends on the structural parameters (i.e. inter-ring and ring-buscoupling coefficients, lengths of the rings, overall propagation loss within the rings), is up to 1.88 times the value of the scale factor of aSRR, which depends only on the ring radius, by assuming that the waveguide structure in both configurations is the same. This promisingnumerical achievement results in a reduction of the sensor footprint of about two times, with respect to a single ring with the same scalefactor. The results obtained may be useful to define new configurations of frequency sensitive optical gyros in low-loss technology, havinga small volume. In fact, by properly choosing the structural parameters, the spectral response of the TRR is forced to assume a shape moresensitive to the resonant frequency shift due to the rotation with respect to that one of a SRR.

Highlights

  • The wide range of application domains for ring resonators, e.g., space, telecommunications and sensing, makes these devices a very interesting research topic

  • In this paper we identify a new solution of a frequency sensitive optical resonant gyroscope formed by three evanescently coupled ring resonators having different ring radius and coupling coefficient, which we call Resonant Micro Optical Gyroscope (RMOG), with the aim of demonstrating the feasibility of using frequency sensitive rather than phase sensitive devices

  • In this paper we have studied a resonant cavity, formed by three ring resonators having different ring radii and coupling ratios, to be used as sensing element of a frequency sensitive resonant optical gyroscope

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Summary

Dell’Olio

Optoelectronics Laboratory, Politecnico di Bari, Via Orabona 4, 70125 Bari, Italy Optoelectronics Laboratory, Politecnico di Bari, Via Orabona 4, 70125 Bari, Italy Optoelectronics Laboratory, Politecnico di Bari, Via Orabona 4, 70125 Bari, Italy Optoelectronics Laboratory, Politecnico di Bari, Via Orabona 4, 70125 Bari, Italy Optoelectronics Laboratory, Politecnico di Bari, Via Orabona 4, 70125 Bari, Italy. The scale factor of the rotating TRR, which depends on the structural parameters (i.e. inter-ring and ring-bus coupling coefficients, lengths of the rings, overall propagation loss within the rings), is up to 1.88 times the value of the scale factor of a SRR, which depends only on the ring radius, by assuming that the waveguide structure in both configurations is the same. This promising numerical achievement results in a reduction of the sensor footprint of about two times, with respect to a single ring with the same scale factor.

INTRODUCTION
TRIPLE RING RESONATOR CONFIGURATION
NUMERICAL RESULTS
TRR spectral response
TRR scale factor
CONCLUSION
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