The photosensitivity of copolymer optical fibre preform is analysed in comparison with the doped one. The effects of write conditions such as pump power and pump time have been studied. Then, the preform is drawn into single mode polymer optical fibre with core refractive index of 1.499, and core-cladding refractive-index difference of 0.008. Long-period birefringence gratings with period of 120 um are fabricated in the fibre. The duty cycle is 50%, and the refractive index change in the exposed area is about 1 x 10(-3).
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机译：与掺杂的光纤预制棒相比，对共聚物光纤预制棒的光敏性进行了分析。已经研究了写入条件（如泵浦功率和泵浦时间）的影响。然后，将预制棒拉制成芯模折射率为1.499，芯包层折射率差为0.008的单模聚合物光纤。在光纤中制造了周期为120 um的长周期双折射光栅。占空比为50％，曝光区域的折射率变化约为1 x 10（-3）。
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