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Journal of the Optical Society of America B

Journal of the Optical Society of America B


  • Editor: Henry Van Driel
  • Vol. 26, Iss. 3 — Mar. 1, 2009
  • pp: 511–516

Highly sensitive sensor based on an ultra-high-Q Mach–Zehnder interferometer-coupled microring

Daoxin Dai and Sailing He  »View Author Affiliations

JOSA B, Vol. 26, Issue 3, pp. 511-516 (2009)

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A high-Q Mach–Zehnder interferometer (MZI)-coupled microring is presented for optical sensing with high sensitivity and a large measurement range. By optimizing the length difference between the two arms of the MZI coupler, the MZI-coupled microring with a high-Q factor and high extinction ratio is obtained. In the present example, the Q factor of the designed silicon-nanowire-based microring is as high as 1.8 × 10 5 when the silicon nanowire has a propagation loss L = 2 dB cm . Due to this high-Q factor, the sensitivity for the change Δ n of the effective refractive index is about 10 5 10 6 by measuring the shift of the resonant wavelength. Because of the wavelength dependence of the coupling ratio of the MZI coupler, it is possible to have only one resonant wavelength with a high extinction ratio in a very large wavelength span [i.e., the quasi-free spectral range of the MZI-coupler microring], which offers a very large measurement range covering the refractive index change of gas/liquid samples (e.g., 0 Δ n < 0.48 in the present example).

© 2009 Optical Society of America

OCIS Codes
(130.2790) Integrated optics : Guided waves
(230.4555) Optical devices : Coupled resonators

ToC Category:
Optical Devices

Original Manuscript: October 2, 2008
Revised Manuscript: December 18, 2008
Manuscript Accepted: January 4, 2009
Published: February 23, 2009

Daoxin Dai and Sailing He, "Highly sensitive sensor based on an ultra-high-Q Mach-Zehnder interferometer-coupled microring," J. Opt. Soc. Am. B 26, 511-516 (2009)

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