Abstract
An ultracompact optical fiber temperature sensor with a fiber-tip structure is proposed and demonstrated based on the Fabry–Perot (FP) interference principle. Composing a tellurite glass microcavity and a commercial multimode fiber, the proposed sensor is fabricated using a simple method of dipping. The theoretical analysis and experimental observation demonstrate that the ambient temperature can be detected by monitoring the wavelength shift of the reflection spectrum. The obtained sensitivity is about 62 pm/°C with linearity of 0.99982 in the range of 20 °C–170 °C. This sensor has great fringe contrast, high linearity, good stability, a wide detection range, and a short response time. It avoids the fusion difficulty between tellurite fiber and silica fiber, and provides a possibility for real-time temperature detection in the biological field and harsh industrial environment.
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