Microfiber Fabry-Perot interferometer for dual-parameter sensing

Jiejun Zhang*, Qizhen Sun, Ruibing Liang, Weihua Jia, Xiaolei Li, Jianghai Wo, Deming Liu, Perry Ping Shum

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review


We propose and demonstrate a microfiber Fabry-Perot interferometer (MFPI) fabricated by taper-drawing microfiber at the center of a uniform fiber Bragg grating (FBG). The MFPI employing the two separated sections of FBG as reflectors and a length of microfiber as its cavity is derived. Theoretic study shows that the reflection spectrum of such MFPI is consisted of two parts-interference fringes induced by multi-beam interference and reflection spectrum envelope induced by FBGs. Temperature affects both interference fringes and reflection wavelength of FBGs while ambient refractive index (RI) only influences the interference fringes, i.e., MFPI has different response to temperature and RI. Therefore, MFPI for simultaneous sensing of RI and temperature is experimentally demonstrated by tracking a reflection peak of interference fringes and the Bragg wavelength of the FBGs, which are respectively assisted by frequency domain processing and Gaussian fitting of the optical spectrum. Consequently, wavelength measurement resolution of 0.5 pm is realized.

Original languageEnglish
Pages (from-to)1608-1615
Number of pages8
JournalJournal of Lightwave Technology
Issue number10
Early online date11 Mar 2013
Publication statusPublished - 15 May 2013


  • Fabry-Perot
  • fiber gratings
  • microfiber interferometer
  • optical fiber sensors


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