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  • Received: May. 13, 2020

    Accepted: Jun. 23, 2020

    Posted: Aug. 24, 2020

    Published Online: Aug. 26, 2020

    The Author Email: Dian Fan (

    DOI: 10.3788/COL202018.101203

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    Xi Chen, Ciming Zhou, Dian Fan, Li Qian, Yandong Pang, Cong Wei, Chenguang Zhao, Sijing Liang, Yuxiao Li. Modified frequency-shifted interferometer: encoding wavelength into phase[J]. Chinese Optics Letters, 2020, 18(10): 101203

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Chinese Optics Letters, Vol. 18, Issue 10, 101203 (2020)

Modified frequency-shifted interferometer: encoding wavelength into phase

Xi Chen1,2,3, Ciming Zhou1, Dian Fan1,*, Li Qian1,4, Yandong Pang1,2, Cong Wei1,2, Chenguang Zhao1, Sijing Liang1, and Yuxiao Li1,2

Author Affiliations

  • 1National Engineering Laboratory for Fiber Optic Sensing Technology, Wuhan University of Technology, Wuhan 430070, China
  • 2School of Information Engineering, Wuhan University of Technology, Wuhan 430065, China
  • 3Department of Mechanical and Electrical Engineering, College of Post and Telecommunication, Wuhan Institute of Technology, Wuhan 430073, China
  • 4Department of Electrical and Computer Engineering, University of Toronto, Toronto, ON M5S 3G4, Canada


We propose a novel modified frequency-shifted interferometer, where a Mach–Zehnder interferometer is added in order to obtain wavelength information. We use the Hilbert transform to extract the wavelength information from the phase of the interference pattern and construct the relationship between phase and wavelength. The laser wavelength measurement experiment is used to verify the compound interferometer. Experimental results demonstrated that our method could obtain the wavelength from the phase, which is of great significance for demodulation of the fiber Bragg grating based on a frequency-shifted interferometer.


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