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Proceedings Paper

Loss-gain coupled ring resonator gyroscope
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Paper Abstract

A new gyroscope architecture inspired by parity-time-symmetric optics is proposed and theoretically modeled. It consists of two ring resonators coupled together, one with loss and the other with gain, with a loss and gain selected such that the device does not lase. A narrow-linewidth laser is coupled into the loss ring to probe the coupled resonator’s rotation-dependent resonances, and a detector measures the rotation-induced change in the power transmitted by the device. Assuming that the small-signal gain is smaller than the loss, a common radius for the two rings of 5 cm, and imposing that the power in the gain medium never exceeds 10% of the saturation power to avoid gain saturation, we demonstrate that this structure has a sensitivity to rotation ~170 times larger than an optimized resonant fiber optic gyroscope of equal ring radius and loss. Such loss-gain coupled resonators are known to exhibit an exceptional point at a critical value of the coupling between resonators, at which point the device’s resonances become extremely sensitive to external perturbations such as a rotation. However, we demonstrate that the maximum rotation sensitivity of this paritytime- symmetric structure does not occur at the exceptional point. Instead, for the aforementioned parameter values and the imposition of a small circulating power, it is maximum when the inter-ring coupling is ~11% stronger than the exceptional-point coupling. This significant increase in rotation sensitivity is found to result to a much larger degree from a strong enhancement in the power circulating in the gain ring (although there is not a one-to-one correspondence), and to a much lower extent from an enhancement in the rotation-induced resonance-frequency shift.

Paper Details

Date Published: 4 March 2019
PDF: 13 pages
Proc. SPIE 10934, Optical, Opto-Atomic, and Entanglement-Enhanced Precision Metrology, 109340T (4 March 2019); doi: 10.1117/12.2515657
Show Author Affiliations
Matthew J. Grant, Stanford Univ. (United States)
Michel J. F. Digonnet, Stanford Univ. (United States)

Published in SPIE Proceedings Vol. 10934:
Optical, Opto-Atomic, and Entanglement-Enhanced Precision Metrology
Selim M. Shahriar; Jacob Scheuer, Editor(s)

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