Multi-Color-Center Kinetic Modeling of Radiation-Induced Attenuation in Silica-Based Optical Fibers

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Abstract
Silica-based optical fibers suffer radiation-induced attenuation (RIA) in radiation-intensive environments, severely reducing their lifespan. We propose a kinetic model based on the evolution of multiple color centers to accurately simulate defect density and quantitatively characterize RIA. The irradiation experiments were conducted using a Co-60 gamma-ray source at a dose rate of 1.25 Gy/s and a controlled temperature of 10 ± 2 °C, with measurements performed at 1310 nm and 1550 nm wavelengths. The model was experimentally validated using fluorine–germanium co-doped fibers. Fitting results demonstrate high accuracy, with a coefficient of determination (R2) > 0.999, normalized root mean square error (NRMSE) < 0.57%, and mean absolute error (MAE) < 0.74 dB/km. Furthermore, it successfully decouples complex macroscopic RIA signals into distinct transient and steady-state defect pools. This phenomenological decoupling enables band-dependent damage analysis and serves as a baseline for evaluating steady-state degradation of F-Ge co-doped fibers under constant irradiation.
Funding Information
  • National Natural Science Foundation of China (12004290)
  • National Natural Science Foundation of China (51909195)
  • Hubei Provincial Natural Science Foundation of China (2020CFB251)
  • Wuhan East Lake High-tech Development Zone (2024KJB302)
  • Scientific Research Project of Education Department of Hubei Province (Q20181501)
  • Scientific Research Project of Education Department of Hubei Province (Q20191512)
  • Scientific Research Foundation of Wuhan Institute of Technology (23QD106)

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