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管内化学气相沉积法(MCVD 法)是制造低损耗石英光纤的较好方法。我们最初制造的石英光纤损耗较高,数字孔径较小,后来做了基本试验,得到了质量较好的光纤。熔炼石英棒的设备由玻璃车床、电气控制柜、流量控制柜及气体纯化装置几部分组成(图1)。用图1所示的实验装置,由鼓泡瓶温度与鼓泡流量控制蒸发量,由蒸发量得到相应的掺杂沉积成分构成各沉积层所要求的折射率。选定鼓泡瓶及蒸发温度后怍出各种蒸发原料的蒸发量与流量关系曲线,调整流量就能得到高折射率芯区与低折射率阻挡层的折射率差,从而得到所要求的数字孔径。要提高数字孔径以加大光纤的集光能力必须加大折射率
In-pipe chemical vapor deposition (MCVD) is a good way to make low-loss quartz optical fibers. The quartz fiber that we originally made had a higher loss and a smaller numerical aperture. After that, we did a basic experiment and got better quality optical fiber. Melting quartz rod equipment from the glass lathe, electrical control cabinet, flow control cabinet and gas purification device composed of several parts (Figure 1). Using the experimental setup shown in Figure 1, the amount of evaporation is controlled by the bubbler temperature and bubbling flow rate, and the corresponding doping deposited composition is calculated from the amount of evaporation to provide the desired refractive index for each deposited layer. After selecting the bubbling bottle and the evaporation temperature, the relationship between the evaporation amount and the flow rate of various evaporation raw materials is obtained, and the refractive index difference between the high refractive index core region and the low refractive index barrier layer can be obtained by adjusting the flow rate to obtain the required number Aperture. To improve the numerical aperture to increase the optical fiber collecting ability must increase the refractive index