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We report a miniature thin-film-based high-temperature sensor prototype with potential for batch fabrication. A thin Tantalum Pentoxide film was deposited on the tip of a polished sapphire fiber using electron-beam evaporation. Using low-coherence optical interferometry, the film was tested as a temperature sensor from 200°C to 1000°C, and its resolution was measured to be 1.4°C. In addition to its potential for low-cost batch production, the sensor's ultra-miniature size of only 75 μm makes it ideal for embedded sensing applications in harsh environments.