Demodulation scheme for fiber Bragg grating sensors based on active control of the spectral response of a wavelength division multiplexer

• Type: Article in International Scientific Journal
• Date: 1998

Authors

Araujo, FM (Author) Other; Ferreira, LA (Author) Other; Santos, JL (Author) FCUP; Farahi, F (Author) Other

Journal

Title: Applied optics

Vol. 37

Pages: 7940-7946

ISSN: 0003-6935

Publisher: The Optical Society

Indexing

ISI Web of Knowledge - 21 Citations

Scopus - 21 Citations

Scientific classification

FOS: Natural sciences > Physical sciences

Other information

Authenticus ID: P-001-6K2

DOI: 10.1364/ao.37.007940

Abstract (EN): We present a closed-loop technique for measuring wavelength shifts associated with fiber Bragg gratings by using a fused biconical wavelength division multiplexer (WDM). The spectral response of the WDM is actively tuned by stretching of the coupling region to maintain a fixed coupling ratio at the reflected Bragg wavelength. The closed-loop operation allows sensitivities usually associated with a highly selective WDM to be obtained without compromising the measurement range. A simple theoretical model is presented together with experimental results for temperature and strain measurements. (C) 1998 Optical Society of America.

Language: English

Type (Professor's evaluation): Scientific