Fiber Bragg grating sensor using polarization-maintaining fiber

편광 유지 광섬유를 이용한 Bragg Grating 센서 제작

  • 김철진 (한국과학기술연구원 정보전자연구부) ;
  • 박태상 (한국과학기술연구원 정보전자연구부) ;
  • 이상배 (한국과학기술연구원 정보전자연구부) ;
  • 최상삼 (한국과학기술연구원 정보전자연구부) ;
  • 정해양 (경희대학교 물리학과 및 레이저 공학 연구소)
  • Published : 1997.10.01


A novel fiber optic sensor is demonstrated using a FBG in PM(Polarization-Maintaining) fiber. Gratings have been written in a Bow-Tie type fiber using the phase mask. The operation of the sensor simply involves monitoring back-reflected Bragg wavelengths from the grating. Since PM fiber has two principal semi-axes with two indices of refraction, two Bragg wavelengths were observed. We have observed the position of Bragg wavelengths for PM FBG shifted simultaneously by either applying the longitudinal strain or temperature change. The wavelength sensitivity of 1.2pm/$\mu$$\varepsilon$ about a longitudinal strain and the wavelength sensitivity of 11.4pm/$^{\circ}C$ about a temperature have been experimentally achieved. The wavelength sensitivity of both longitudinal strain and temperature are approximately same with the reported values for the single mode FBG. On the other hand, the change of separation between Bragg wavelengths was observed by the applying transverse stress. We observed that the separation between two Bragg wavelengths is proportional to the applied transverse stress. The wavelength sensitivity of 14.6 pm/N about a transverse stress has been achieved. We have demonstrated PM FBG sensors can measure the transverse stress independently from the effects of temperature.



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