Yin Yuyi, Ge Tingwu, Zhao Guanrui, Jia Ruoyu, Wang Zhiyong
School of Physics and Optoelectronic Engineering, Beijing University of Technology, Beijing 100124, China.
Nanomaterials (Basel). 2025 Jan 2;15(1):62. doi: 10.3390/nano15010062.
This paper investigates the thermal effects in fused-tapered passive optical fibers under near-infrared absorption. The thermal effect is primarily caused by impurities, such as OH-, which absorb incident light and generate heat. Using the finite element method, the volume changes during fiber tapering were simulated, influencing power density and thermal distribution. The heat conduction equation and ray optics were employed to analyze the thermal distribution in tapered fibers and signal combiners. Results show that at 5 kW power, the temperature peak for a single fiber reaches 316.73 °C, while for bundled fibers, the temperature rises significantly as the bundle configuration increases from 7 × 1 to 61 × 1, peaking at 453.09 °C-an increase of 171.6%. Variations in tapering ratio and length also notably affect the thermal behavior. Increasing the tapering ratio from 5 to 8 results in a 52.5% temperature rise, while doubling the taper length from 25 mm to 50 mm reduces the temperature peak by 59.1%. These findings offer important insights for the design and optimization of high-power optical fiber combiners and their heat dissipation structures.
本文研究了近红外吸收下熔锥型无源光纤中的热效应。热效应主要由诸如OH-等杂质引起，这些杂质吸收入射光并产生热量。采用有限元方法，模拟了光纤锥形化过程中的体积变化，其影响功率密度和热分布。利用热传导方程和光线光学分析了锥形光纤和信号合波器中的热分布。结果表明，在5kW功率下，单根光纤的温度峰值达到316.73°C，而对于成束光纤，随着束结构从7×1增加到61×1，温度显著上升，峰值为453.09°C，增加了171.6%。锥形比和长度的变化也显著影响热行为。将锥形比从5增加到8会导致温度上升52.5%，而将锥形长度从25mm增加一倍至50mm会使温度峰值降低59.1%。这些发现为高功率光纤合波器及其散热结构的设计和优化提供了重要见解。
