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Optics Letters

Optics Letters


  • Editor: Anthony J. Campilo
  • Vol. 32, Iss. 17 — Sep. 1, 2007
  • pp: 2577–2579

Optimization of optical ring resonator devices for sensing applications

M. Sumetsky  »View Author Affiliations

Optics Letters, Vol. 32, Issue 17, pp. 2577-2579 (2007)

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The Q-factor of an optical resonance device determines the width of its transmission resonances. For this reason, in sensing applications of optical resonators, it is commonly assumed that the Q-factor fully determines resonator sensitivity. Practically, the latter is not exactly correct. In this Letter, the parameters responsible for the sensitivity of resonance devices (i.e., the steepness and the sharpness of the transmission resonance) are analyzed. It is shown that, for given intrinsic losses of a single ring resonator sensor, the slope of the resonance is largest if its extinction ratio is 9.5 dB , while the resonance is sharpest if its extinction ratio is 6 dB . For a sensor consisting of several identical ring resonators coupled to a bus waveguide, the largest slope and sharpness parameters correspond to the extinction ratios of 9 dB and 4.5 dB , respectively. The determined optimum parameters can be achieved by tuning the coupling between the resonator rings and the waveguide.

© 2007 Optical Society of America

OCIS Codes
(060.2370) Fiber optics and optical communications : Fiber optics sensors
(130.6010) Integrated optics : Sensors
(140.4780) Lasers and laser optics : Optical resonators

ToC Category:
Integrated Optics

Original Manuscript: July 3, 2007
Revised Manuscript: August 2, 2007
Manuscript Accepted: August 6, 2007
Published: August 22, 2007

M. Sumetsky, "Optimization of optical ring resonator devices for sensing applications," Opt. Lett. 32, 2577-2579 (2007)

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  13. Equations and assume that the accuracy of measurement of the transmission power does not depend on the power magnitude.
  14. In fact, introducing the attenuation constant α we have 1−τ=1−exp(−αL)≈αL and, therefore, γi≈αλ02/(2πn).

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