Abstract

An optical fiber high-temperature sensor is proposed and demonstrated by use of cascaded multiple Fabry–Perot interferometers in no-core fiber with a waveguide fabricated by femtosecond laser pulse inscription. The device can sustain the high temperature up to 1100°C, and the temperature sensitivity obtained is 8.9 pm/°C within the temperature range 100°C–400°C, and 16.36 pm/°C within the temperature range 400°C–1100°C, respectively. Such a no-core fiber-based device can be fabricated in a simple way and operated reliably, which makes it attractive for extreme environment monitoring.

© 2019 Optical Society of America

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