Combined Temperature Radiation Effects and Influence of Drawing Conditions on Phosphorous-Doped Optical Fibers

摘要

This work focuses on the effects of high dose ionizing radiation, up to10 MGy(SiO_2), on P-doped multimode optical fibers (OF) at differentirradiation temperatures. The investigation is based on two complementaryexperimental techniques: radiation-induced attenuation (RIA) measurementsand electron paramagnetic resonance (EPR). The latter technique allowsmeasuring the P1, P2, metastable-POHC and stable-POHC defects. Three OFsamples are drawn from the same preform to evaluate the influence ofchanging their drawing conditions of the OFs on the radiation responses.This first study is performed under X-rays at room temperature. The resultsare compared with the ones of γ-rays irradiation. The latter allows tohighlight a linear correlation between the NIR absorption band at 1.6mm andthe EPR signal of P1 defects, which supports D. Griscom’s assignment ofthis absorption band to the P1 defect. The combined effect of ionizingradiation and irradiation temperature is also investigated extensively: onlineRIA measurements as well as post-mortem EPR measurements for irradiationtemperatures ranging from 25 to 280 ℃ and doses up to 3 Mgy areperformed. Both RIA and EPR data show that increasing the irradiationtemperature can lead to an increased production of point defects andassociated absorption bands. This result is of great importance for theemployment of P-doped Ofs in radiation environment.