VCSEL-Based Tilted Fiber Grating Vibration Sensing System

Yuheng Huang, Chao Lu, Tuan Guo, Hwa Yaw Tam

Research output: Journal article publicationJournal articleAcademic researchpeer-review

41 Citations (Scopus)


A fiber-optic vibration sensing system that uses a tilted fiber Bragg grating (TFBG) and a vertical-cavity surface-emitting laser (VCSEL) has been demonstrated. The backward-propagating low-order cladding modes excited by the TFBG can be effectively recoupled to the fiber core via a lateral-offset-splice upstream the TFBG and the amount of recoupling varies strongly with fiber curvature, providing the sensing mechanism. VCSEL with matched wavelength enables the recoupling to work at a high power level and an improved optical signal-to-noise ratio better than 40 dB is achieved. Meanwhile, VCSEL provides a high-speed continuous wavelength tuning over 1 ~ 2 nm which perfectly covers the strongest recoupling band, making the demodulation filter unnecessary. Dynamic vibration measurement up to 200 Hz has been achieved via cost-effective normalized power detection.
Original languageEnglish
Pages (from-to)1235-1237
Number of pages3
JournalIEEE Photonics Technology Letters
Issue number16
Publication statusPublished - 15 Aug 2010


  • Tilted fiber grating
  • vertical-cavity surface-emitting laser (VCSEL)
  • vibration measurement

ASJC Scopus subject areas

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


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