Enhancing the sensitivity of interferometer sensing by slow light in photonic crystal waveguide


  • Qi Wang Northeastern University
  • Ya-nan Zhang Northeastern University
  • Bo Han Northeastern University
  • Lu Bai Northeastern University
  • Yong Zhao Northeastern University




A novel high sensitivity Mach-Zehnder interferometer (MZI) with slow light in photonic crystal waveguide (PCW) is proposed to enhance the sensitivity of fiber Brag grating (FBG) sensing system. The output intensity of MZI would be changed with the reflect center wavelength change of the FBG, which relates to the applied strain. By designing the PCW parameters, the measuring sensitivity of the applied strain can reach to 3.6 x 10-3rad/?? with a very high group index of 118. The active region is only 0.1 mm, which could be of great advantage in the use of the limited space.

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How to Cite

Q. Wang, Y.- nan Zhang, B. Han, L. Bai, and Y. Zhao, “Enhancing the sensitivity of interferometer sensing by slow light in photonic crystal waveguide”, Photonics Lett. Pol., vol. 4, no. 4, pp. pp. 131–133, Dec. 2012.