Variable optical reflector and strain sensor using multimode fiber Bragg grating and mode conversion

Zhihao Chen, Xiufeng Yang, Junhong Ng, Xiaoqun Zou, Chao Lu

Research output: Journal article publicationConference articleAcademic researchpeer-review

1 Citation (Scopus)


We report on a narrow band optical fiber filter utilizing a multimode fiber Bragg grating and fiber mode scrambler in order to tune its reflectivity that is useful as variable optical reflector and strain sensor. A change of reflectivity from 81% to 2% is achieved. We develop a novel fiber Bragg grating strain sensor that allows strain to be applied in the portion of the multimode fiber without grating. Particular advantages of this strain sensor are simple design, low system cost and high sensitivity. A strain sensitivity of 0.0013%/microstrain in change of reflectivity and large dynamic range (0-7,000 microstrain) are demonstrated. The strain sensitivity can be improved greatly by using efficient mode conversion structure in the device.
Original languageEnglish
Article number164
Pages (from-to)671-674
Number of pages4
JournalProceedings of SPIE - The International Society for Optical Engineering
Volume5855 PART II
Publication statusPublished - 13 Dec 2005
Externally publishedYes
Event17th International Conference on Optical Fibre Sensors, OFS-17 - Bruges, Belgium
Duration: 23 May 200527 May 2005


  • Fiber Bragg grating (FBG)
  • Mode scrambler
  • Multimode fiber
  • Strain

ASJC Scopus subject areas

  • Electrical and Electronic Engineering
  • Condensed Matter Physics


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