Temperature-insensitive strain measurement using in-fiber Bragg gratings inscribed in photonic crystal fiber
Optical and Quantum Electronics(2016)
摘要
Two gratings with closely spaced center-wavelengths are written in either side of a splice between two cascaded photonic crystal fibers of same diameter. The relative wavelength-shifts in response to the temperature can be compensated by means of filling rational fluid material into the cladding air-holes. Separate measurement of strain with a high sensitivity can be achieved just by analyzing the wavelength-shifts of the reflection peaks. The presented discrimination method can well restrain the cross-sensitivity effect, and render a new category of inherently temperature-insensitive strain sensors.
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关键词
Cross sensitivity,Photonic crystal fiber,Fiber grating,Nonlinear optics
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