TDM of FBG sensors by use of a tunable laser source

C. C. Chan; Wei Jin; M. S. Demokan

doi:10.1117/12.417871

TDM of FBG sensors by use of a tunable laser source

C. C. Chan, Wei Jin, M. S. Demokan

The Hong Kong Polytechnic University

Research output: Journal article publication › Conference article › Academic research › peer-review

1 Citation (Scopus)

Abstract

The results of an investigation of the performance of a TDM FBG sensor array using a tunable laser source are reported. The system performance is found to be limited by the extinction ratio of the optical pulse modulator used for pulse amplitude modulation. Formulas that relate the crosstalk to the extinction ratio of the optical pulse modulator, the modulation parameters of the tunable laser, and the optical path differences among sensing channels are derived. Computer simulation shows that an array of 20 FBG sensors with 3 με resolution can be realized with a commercially available single Mach-Zehnder type optical pulse modulator of -35 dB extinction ratio. Experiments with a 4-FBG sensor array demonstrated a strain resolution of about 3.98 με with an optical pulse modulator of about -24 dB extinction ratio.

Original language	English
Pages (from-to)	77-86
Number of pages	10
Journal	Proceedings of SPIE - The International Society for Optical Engineering
Volume	4357
DOIs	https://doi.org/10.1117/12.417871
Publication status	Published - 1 Jan 2001
Event	Distributed Fiber Optical Sensors and Measuring Networks - , Russian Federation Duration: 1 Jan 2001 → …

Keywords

Fiber Bragg gratings
First derivative technique
Optical fiber sensors
Time-division-multiplexing
Tunable laser

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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10.1117/12.417871

Cite this

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TDM of FBG sensors by use of a tunable laser source

Abstract

Keywords

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