| Citation: | WANG Hui-jie, CHANG Qi-wei, YOU Ya-jun, YANG Xu-lei, HE Wen-jun, HE Jian, LIU Yi, CHOU Xiu-jian. High-precision microwave photonic temperature sensor using thin-film lithium niobate micro-ring[J]. Chinese Optics. doi: 10.37188/CO.2025-0121
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This paper presents a high-precision temperature sensor based on a high-quality factor thin-film lithium niobate microring resonator integrated with a microwave photonic readout system. The microring resonator, with a narrow linewidth of 2.87 pm and a high Q-factor of 105, functions simultaneously as the temperature-sensing element and the core signal processing component of a microwave photonic filter. Through the thermo-optic effect, temperature variations are converted into shifts in the optical resonance wavelength, which are innovatively mapped to linear changes in the passband center frequency of the microwave photonic filter. A vector network analyzer is employed to accurately detect the microwave frequency response, enabling temperature measurement via high-resolution frequency variations and establishing a quantitative model between temperature and frequency shift. In contrast to conventional methods that directly track optical wavelength shifts, the proposed microwave photonic readout technique linearly converts minute resonance wavelength shifts into changes in the microwave center frequency, thereby overcoming the resolution limitations inherent in conventional optical spectrum analyzers. Experimental results demonstrate a sensitivity of 27 MHz/°C and a resolution of 0.002 °C, with excellent linearity maintained under temperature variations as small as 0.01 °C. This work effectively resolves the trade-off between sensitivity and resolution in traditional optical temperature sensing, offering a novel solution for on-chip integrated high-precision temperature monitoring.
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