Ishigure T, Nihei E, Koike Y
Appl Opt. 1996 Apr 20;35(12):2048-53. doi: 10.1364/AO.35.002048.
The optimum refractive-index distribution of the high-bandwidth graded-index polymer optical fiber (POP) was clarified for the first time by consideration of both modal and material dispersions. The ultimate bandwidth achieved by the POP is investigated by a quantitative estimation of the material dispersion as well as the modal dispersion. The results indicate that even if the refractive-index distribution is tightly controlled, the bandwidth of the graded-index POP is dominated by the material dispersion when the required bit rate becomes larger than a few gigabits per second. It is also confirmed that the material dispersion strongly depends on the matrix polymer and that the use of a fluorinated polymer whose material dispersion [-0.078 ns/(nm km)] is lower than that of poly(methyl methacrylate) [-0.305 ns/(nm km)] allows for a 10-Gb/s signal transmission.
通过综合考虑模式色散和材料色散，首次明确了高带宽渐变折射率聚合物光纤（POP）的最佳折射率分布。通过对材料色散以及模式色散进行定量估算，研究了POP所能达到的极限带宽。结果表明，即使折射率分布得到严格控制，当所需比特率大于每秒几吉比特时，渐变折射率POP的带宽仍由材料色散主导。还证实了材料色散强烈依赖于基体聚合物，并且使用材料色散[-0.078 ns/(nm·km)]低于聚甲基丙烯酸甲酯[-0.305 ns/(nm·km)]的含氟聚合物能够实现10 Gb/s的信号传输。
