Dataset for: Quantitative Optical–Electrical Proportionality Between Bragg Wavelength Shift and Photovoltaic Voltage Variation

This dataset contains synchronized measurements of Bragg wavelength shift, reference temperature, and photovoltaic voltage recorded at 1 Hz during controlled thermal cycling (48.3–77.7 °C heating and 77.7–37.2 °C cooling). The data support regression and proportionality analysis between optical wavelength variation and photovoltaic voltage behavior presented in the associated manuscript.本数据集包含在受控热循环（48.3–77.7 °C升温阶段与77.7–37.2 °C降温阶段）过程中，以1赫兹（Hz）频率采集的同步测量数据，涵盖布拉格波长漂移（Bragg wavelength shift）、参考温度及光伏电压三项观测指标。该数据集可支撑相关研究手稿中提出的光波长变化与光伏电压特性间的回归分析与比例分析。