Linear interrogation of fiber Bragg grating sensor array using time-delayed quadrature sampling technique

시간지연 샘플링을 이용한 광섬유 격자 센서어레이의 선형 복조

  • 김종섭 (전북대학교 전자정보공학부) ;
  • 송민호 (전북대학교 전자정보공학부)
  • Published : 2004.02.01


A fiber laser of which wavelength was scanned by an intra-cavity FP (Fabry-Perot) filter was used to interrogate a fiber Bragg grating strain sensor array. We calculated the wavelength variation of the fiber laser using quadrature signal processing with an unbalanced M/Z (Mach-Zehnder) interferometer and time-delayed sampling technique. The calculated wavelengths are mapped to corresponding temporal reflection peaks from the sensor array, which enables more accurate and stable interrogation without the problems caused by the FP filter's nonlinear characteristics. Wavelength resolution of ∼20 pm was obtained in our experimental setup, which could have been greatly enhanced with faster phase modulation.


  1. J. Lightwave Technol. v.15 no.8 Fiber grating sensors A.D.Kersey;M.A.Davis;H.J.Patrick;M.LeBlanc;K.P.Koo;C.G.Askins;M.A.Putnam;E.J.Friebele
  2. Electron. Lett. v.37 no.12 Improvement of measurement accuracy of fibre Bragg grating sensor systems by use of gas absorption lines as multi-wavelength references C.C.Chan;W.Jin;H.L.Ho;D.N.Wang;Y.Wang
  3. Opt. Lett. v.14 no.15 Formation of Bragg gratings in optical fibers by a transverse holographic method G.Meltz;W.W.Morey;W.H.Glenn
  4. IEEE J. Quantum Electron. v.QE-18 no.10 Homodyne demodulation scheme for fiber optic sensors using phase generated carrier A.A.Dandridge;A.B.Tveten;T.G.Giallorenzi
  5. Laser Focus World v.34 no.3 Multiplexed fiber gratings enhance mechanical sensing C.Miller;T.Li;J.Miller;F.Bao;K.Hsu
  6. Tech. Digest OFS-16, Th2-5 Fiber grating sensor array interrogation by using time-delayed sampling of fiber laser Z.Jin;M.Song
  7. Opt. Lett. v.18 no.16 Multiplexed fiber Bragg grating strain-sensor system with a fiber Fabry-Perot wavelength filter A.D.Kersey;T.A.Berkoff;W.W.Morey
  8. Appl. Opt. v.39 no.7 Fiber Bragg grating strain sensor demodulation with quadrature sampling of a Mach- Zehnder interferometer M.Song;S.Yin;P.B.Ruffin
  9. Opt. Lett. v.23 no.11 Interrogation of fiber grating sensor arrays with a wavelength-swept fiber laser S.H.Yun;D.J.Richardson;B.Y.Kim