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Improved Spectral Resolution of Long-Period Fiber Grating Sensors for Ultra-High Temperature Environments Using Narrow Interferences between Regenerated Gratings

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We thermally regenerated long-period fiber gratings at 850°C. Two strong seed gratings 10cm apart interfere near 1550nm. The regenerated grating has narrow interference fringes above 20% deep and stable up to 1000°C ideal for high-temperature sensors.

© 2014 Optical Society of America

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