Compact in-fiber interferometer formed by long-period gratings in photonic crystal fiber

Jian Ju, Wei Jin, Hoi Lut Ho

Research output: Journal article publicationJournal articleAcademic researchpeer-review

33 Citations (Scopus)


We reported the design and implementation of an in-fiber Mach-Zehnder interferometer (MZI) based on a pair of long-period gratings (LPGs) written on a photonic crystal fiber (PCF). The LPG was fabricated by using a pulsed CO2laser to carve grooves periodically along the PCF. The MZI relies on the interference between the fundamental core mode and a cladding mode of the PCF. The MZI was further demonstrated as a temperature sensor and a strain sensor. The temperature and strain sensitivities were measured to be 42.4 pm/°C · m and -2.6 pm/ με, respectively. We also fabricated an MZI on a single-mode fiber, which has a temperature sensitivity of 1215.56 pm/°C · m and a strain sensitivity of +0.445 pm/με.
Original languageEnglish
Pages (from-to)1899-1901
Number of pages3
JournalIEEE Photonics Technology Letters
Issue number23
Publication statusPublished - 1 Dec 2008


  • Long-period gratings (LPGs)
  • Optical fiber sensors
  • Photonic crystal fibers (PCFs)

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Atomic and Molecular Physics, and Optics
  • Electrical and Electronic Engineering


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