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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 17, Iss. 9 — Apr. 27, 2009
  • pp: 7708–7716

Fano-resonance-based Mach-Zehnder optical switch employing dual-bus coupled ring resonator as two-beam interferometer

Fan Wang, Xiang Wang, Haifeng Zhou, Qiang Zhou, Yinlei Hao, Xiaoqing Jiang, Minghua Wang, and Jianyi Yang  »View Author Affiliations

Optics Express, Vol. 17, Issue 9, pp. 7708-7716 (2009)

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A kind of Mach-Zehnder optical switch with a dual-bus coupled ring resonator as a two-beam interferometer is proposed and investigated. The analysis based on the transfer matrix method shows that a sharp asymmetric Fano line shape can be generated in the transmission spectra of such a configuration, which can be used to significantly reduce the phase change required for switching. Meanwhile, it can also be found that complete extinctions can be achieved in both switching states if the structural parameters are carefully chosen and the phase bias is properly set. Through tuning the phase difference between the arms of the Mach-Zehnder interferometer, complete extinction can be easily kept within a large range of the ring-bus coupling ratios in the OFF state. By properly modulating the phase change in the ring waveguide, the shift of the resonant frequency and the asymmetry of the transmission spectra can be controlled to finally enable optical switching with a high extinction ratio, even complete extinction, in the ON state. The switching functionality is verified by the finite-difference time-domain simulation.

© 2009 Optical Society of America

OCIS Codes
(130.2790) Integrated optics : Guided waves
(130.3120) Integrated optics : Integrated optics devices
(230.5750) Optical devices : Resonators
(130.4815) Integrated optics : Optical switching devices

ToC Category:
Integrated Optics

Original Manuscript: March 5, 2009
Revised Manuscript: April 22, 2009
Manuscript Accepted: April 23, 2009
Published: April 24, 2009

Fan Wang, Xiang Wang, Haifeng Zhou, Qiang Zhou, Yinlei Hao, Xiaoqing Jiang, Minghua Wang, and Jianyi Yang, "Fano-resonance-based Mach-Zehnder optical switch employing dual-bus coupled ring resonator as two-beam interferometer," Opt. Express 17, 7708-7716 (2009)

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