An all-optical fiber sensor fabricated by a femtosecond laser for temperature sensing

Longjiang Zhao, Lan Jiang, Sumei Wang, Hai Xiao, Yongfeng Lu, Hai Lung Tsai

Research output: Contribution to journalArticle

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An all-optical fiber temperature sensor fabricated by a femtosecond (fs) laser is proposed in this study. The fiber sensor is of a very simple structure: a trench that overlaps with the fiber core, which makes a two light paths structure inline the fiber where one is the remained fiber core and the other is the trench. Then, the two transmitted beams interfere with each other and form a Mach-Zehnder interferometer (MZI). The sensor sensitivity is 55 pm/°C at temperatures in range of 30-220 °C with a step of 10 °C. The fringe visibility of the all-optical fiber sensor is greater than 30 dB at 150 °C for interference dip wavelengths, and the attenuation band has a 3 dB line-width of about 0.8 nm.

Original languageEnglish (US)
Pages (from-to)1948-1951
Number of pages4
JournalSensor Letters
Issue number5
Publication statusPublished - Oct 1 2011



  • All-optical fiber sensor
  • Femtosecond laser
  • Temperature sensing

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics
  • Electrical and Electronic Engineering

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