Fiber-Bragg-grating cavity sensor based on a self-seeded Fabry-Perot laser diode

Research output: Chapters, Conference Papers, Creative and Literary Works (RGC: 12, 32, 41, 45)32_Refereed conference paper (with ISBN/ISSN)peer-review

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Detail(s)

Original languageEnglish
Title of host publicationProceedings of SPIE - The International Society for Optical Engineering
Volume6351 I
Publication statusPublished - 2006

Publication series

Name
Volume6351 I
ISSN (Print)0277-786X

Conference

TitlePassive Components and Fiber-based Devices III
PlaceKorea, Republic of
CityGwangju
Period5 - 7 September 2006

Abstract

We propose a low-cost, general-purpose fiber Bragg grating (FBG) cavity sensing technique, where optical picosecond pulses generated from a self-seeded Fabry-Perot laser diode are used to interrogate a fiber cavity formed with two chirped FBGs and the optical loss in the cavity is determined from the peak power ratio of the first two pulses reflected from the cavity. This technique does not require intensity referencing and the sensor output is insensitive to drifts in the center wavelengths of the FBGs. We demonstrate this technique experimentally with a long-period fiber grating (LPFG) placed in the fiber cavity as a refractive-index sensor. The results from the cavity-loss measurement are consistent with the wavelength-shift measurement of the LPFG in response to a change in the surrounding index. This technique is applicable to general intensity-based sensors and has the potential to be further developed for remote sensing of a wide range of physical or chemical parameters. It also provides a new way of converting the wavelength shift of an LPFG sensor into an intensity-based signal for easy processing.

Research Area(s)

  • Cavity loss, Fabry-perot laser diode, Fiber bragg grating, Fiber optic sensor, Long-period fiber grating, Optical fiber cavity

Citation Format(s)

Fiber-Bragg-grating cavity sensor based on a self-seeded Fabry-Perot laser diode. / Liu, Yunqi; Chiang, Kin Seng.

Proceedings of SPIE - The International Society for Optical Engineering. Vol. 6351 I 2006. 635112.

Research output: Chapters, Conference Papers, Creative and Literary Works (RGC: 12, 32, 41, 45)32_Refereed conference paper (with ISBN/ISSN)peer-review