Wavelength locking of double FBG and its applications in fiber sensing system

Ming Chang Shih*, Shieh Yueh Yang, Yi Shen Chen, Yi Tung Shiu, Yi Chiun Shen, Tzung Yu Shei

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingConference contribution


In this paper we demonstrated a fiber sensing system using the method of wavelength locking of two nearly identical fiber Bragg gratings (FBG) to interrogate the wavelength shift by directly measuring the intensity of the reflection from the sampling FBG. The light source of the sensing system is based on a fiber ring laser structure in which a reference FBG is used for locking the wavelength of the fiber ring laser pumped by a 980 nm laser diode to achieve lasing at 1555.85 nm. The wavelength locking method is able to an effective way of interrogating the wavelength shifting of a FBG by the intensity of the reflection from the sampling FBG, and is able to achieve real time sensing of the physical perturbations. In addition, the characteristics of the fiber sensing system for dynamic vibration and the key factors to acquire stable sensing are discussed.

Original languageEnglish
Title of host publicationOptical Sensing II
Publication statusPublished - 2006
EventOptical Sensing II - Strasbourg, France
Duration: 2006 Apr 32006 Apr 6

Publication series

NameProceedings of SPIE - The International Society for Optical Engineering
ISSN (Print)0277-786X


ConferenceOptical Sensing II


  • Fiber Bragg grating
  • Ring laser
  • Sensors
  • Wavelength locking

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering


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