Title :
Fiber-chirped grating Fabry-Perot sensor with multiple-wavelength-addressable free-spectral ranges
Author :
Koo, K.P. ; LeBlanc, M. ; Tsai, T.E. ; Vohra, S.T.
Author_Institution :
Naval Res. Lab., Washington, DC, USA
fDate :
7/1/1998 12:00:00 AM
Abstract :
We report the demonstration of a fiber-chirped grating Fabry-Perot (FP) sensor with large dynamic range and high resolution surpassing that of a conventional FP sensor. The chirped grating FP sensor functions as an array of collocated FP cavities with different wavelength addressable cavity lengths or free-spectral ranges. This sensor design allows large dynamic range and high resolution to be achieved in a single compact sensor head. Free-spectral range from 0.04 to 1.3 nm has been achieved. Using this device as a strain sensor, unambiguous (without fringe counting) strain measurements from 3/spl plusmn/1 μstrain (limited by probe source resolution) to 1300 μstrain have been measured.
Keywords :
Fabry-Perot resonators; chirp modulation; diffraction gratings; fibre optic sensors; optical resolving power; strain measurement; strain sensors; chirped grating FP sensor; collocated FP cavities array; conventional FP sensor; fiber-chirped grating Fabry-Perot sensor; free-spectral ranges; high resolution; large dynamic range; multiple-wavelength-addressable free-spectral ranges; probe source resolution; single compact sensor head; strain sensor; wavelength addressable cavity lengths; Capacitive sensors; Chirp; Dynamic range; Fabry-Perot; Fiber gratings; Laboratories; Optical fiber sensors; Sensor arrays; Strain measurement; Wavelength measurement;
Journal_Title :
Photonics Technology Letters, IEEE