The fiber is F-doped cladding and the core is pure SiO2 with low OH & content. It is shown that through the nuclear radiating experiment, minimum transient induced loss is 3. 4dB / m. krad. 光纤包层为F掺杂,纯SiO2纤芯,低OH-根含量,经核辐照后的实验结果表明,光纤瞬态峰值感应损耗最低为3.4dB/m·krad。