Fiber torsion sensor demodulated by a high-birefringence fiber Bragg grating

Yu Lung Lo, Bo Rong Chue, Shao Hong Xu

Research output: Contribution to journalArticlepeer-review

21 Citations (Scopus)


A new high-birefringence (Hi-Bi) fiber torsion sensor demodulated by a Hi-Bi fiber Bragg grating (FBG) is proposed in this study. The twisted Hi-Bi fiber sensor characteristics are analyzed using the Jones matrix. The intensity ratio from two reflected Bragg wavelengths is associated with the twist angle of the measured Hi-Bi fiber. It is found that the twist angle resolution is estimated at around 0.3° under ±0.1 dB readout from an optical spectrum analyzer if the polarization state of the light source is stable. The advantages of this new torsion sensor are: (1) insensitivity to intensity variations from the light source, (2) insensitivity to the torsion gauge length, and (3) absolute measurement in the twist angle. However, the polarization state of light in the proposed method needs to be controlled, and any birefringence change in the twisted Hi-Bi fiber needs to be prevented.

Original languageEnglish
Pages (from-to)287-295
Number of pages9
JournalOptics Communications
Issue number4-6
Publication statusPublished - 2004 Feb 1

All Science Journal Classification (ASJC) codes

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

Fingerprint Dive into the research topics of 'Fiber torsion sensor demodulated by a high-birefringence fiber Bragg grating'. Together they form a unique fingerprint.

Cite this