Interrogation of fiber-Bragg-grating sensors using dual-wavelength pulses generated from a self-seeded Fabry-Perot laser diode

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)22_Publication in policy or professional journal

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Detail(s)

Original languageEnglish
Article number4
Pages (from-to)27-38
Journal / PublicationProceedings of SPIE - The International Society for Optical Engineering
Volume5634
Issue numberPART 1
Publication statusPublished - 2005

Conference

TitleAdvanced Sensor Systems and Applications II
PlaceChina
CityBeijing
Period8 - 12 November 2004

Abstract

We present a simple technique for the interrogation of fiber Bragg grating (FBG) sensors using a self-seeded Fabry-Perot laser diode (FP-LD). The FBG sensor is configured in such a way that its reflection spectrum consists of two peaks, whose separation depends on the physical parameter to be measured. When the modulating frequency of the FP-LD is set properly, stable short pulses at the two wavelengths selected from the same FP-LD mode with the FBG are generated simultaneously. The wavelength separation of the dual-wavelength pulses is converted into a time difference by transmitting the pulses through a dispersive fiber. In this way, accurate wavelength measurement is replaced by the less expensive time measurement. To multiplex similar sensors that are sufficiently far apart spectrally, it is only necessary to change the modulating frequency of the FP-LD. To balance the pulse intensities at the two wavelengths for a particular sensor, the temperature of the FP-LD can be adjusted. Using this technique, we demonstrated experimentally a number of FBG-based sensors, including displacement/bending sensors, temperature-compensated current sensors, and transverse force sensors. This technique provides an intensity-referencing- free demodulation scheme, an easy way to interrogate a series of sensors, and an effective means to overcome drifts.

Research Area(s)

  • Dual-wavelength pulse laser, Fiber Bragg grating, Fiber optic sensor, Multiplexing, Temperature compensation

Citation Format(s)

Interrogation of fiber-Bragg-grating sensors using dual-wavelength pulses generated from a self-seeded Fabry-Perot laser diode. / Liu, Yunqi; Chiang, Kin Seng; Chu, Pak Lim.

In: Proceedings of SPIE - The International Society for Optical Engineering, Vol. 5634, No. PART 1, 4, 2005, p. 27-38.

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)22_Publication in policy or professional journal