The demand for high-capacity data transmission in optical communication links such as office and home networks has increased with spread of the Internet. The silica single-mode fibers (SMFs) have low loss and high bandwidth. However, the process of connecting SMFs with transceiver is complex, because the core diameter of SMF is small (< 10 μ m). On the other hand, polymer optical fibers (POFs) have large core diameter, because polymer materials have excellent flexibility and durability. Furthermore, high bandwidth POF was achieved by having graded index distribution in the core region. The commercial graded index POFs (GI POFs) have already been installed in newly built condominiums and hospitals. However, lower bending loss GI POFs compared with the commercial GI POFs have been demanded to install in condominiums which have been already built. In this study, we proposed and fabricated the high numerical aperture (NA) GI POFs to reduce the bending loss and estimated the characteristic optical properties of the high NA GI POFs under a grueling bending condition. The NA of GI POFs are 0.45 (fiber A), 0.35 (fiber B), 0.28 (fiber C) and 0.12 (fiber D), respectively. The NA of fiber A is two point five times as large as that of the conventional one. The NA of fiber B and C are also larger than that of the conventional one. The NA of fiber D is lower than that of the conventional one. The system of bending loss measurement is shown in Fig. 1. A 3-m sample of GI POF is statically bent at a position about 1-m from the input. The bending angle is 90 degree, bending number is two, and bending radius is varied from 5 to 50 mm. The launching condition is fixed to the restricted mode launch throughout the measurement. The bending loss is determined by the difference of the output power before and after bending. The output power is measured by an optical power meter. Figure 2 shows the result of the bending losses of these GI POFs. When the bending radius is over 5 mm, the bending loss of fiber A is under 0.2 dB at 655-nm wavelength. In the case of 5 mm bending radius, the bending loss of fiber B is 0.58 dB. The bending loss of fiber B is under 0.4 dB in the case of over 10 mm bending radius. The bending loss of fiber C is 0.92 dB when the bending radius is 5 mm. The bending loss of fiber C is under 0.4 dB when bending radius is over 10 mm. The bending loss of fiber D is over 0.6 dB under all measurement conditions. As a result, it was clarified that the bending loss of GI POF having high NA (0.54) was reduced under a grueling bending condition. Fiber B and C had about the same bending loss over 10 mm bending radius. However, the bending loss of fiber C increased drastically under the 5 mm bending radius.
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机译：在互联网的传播中，诸如办公室和家庭网络之类的光通信链路中对高容量数据传输的需求增加。二氧化硅单模纤维（SMF）具有低损耗和高带宽。然而，将SMF与收发器连接的过程是复杂的，因为SMF的核心直径小（<10μm）。另一方面，聚合物光纤（POFS）具有大的芯直径，因为聚合物材料具有优异的柔韧性和耐久性。此外，通过在核心区域中具有渐变指数分布来实现高带宽POF。商业分级指数POFS（GI POFS）已经安装在新建的公寓和医院。然而，已经要求较低的弯曲损耗GI POFS与商业GI POF相比，已经在已经建造的公寓中安装。在这项研究中，我们提出并制造了高数值孔径（NA）GI POF，以降低弯曲损耗并在艰苦的弯曲条件下估计高Na Gi Pofs的特征光学性质。 GI POF的NA分别为0.45（纤维A），0.35（纤维B），0.28（纤维C）和0.12（纤维D）。纤维A的Na是传统的纤维A的含量五倍。纤维B和C的Na也大于常规纤维。纤维D的NA低于传统的NA。弯曲损耗测量系统如图1所示。3M样品的GI POF样品在距离输入约1m的位置处静态弯曲。弯曲角度是90度，弯曲数为两个，并且弯曲半径从5到50mm变化。启动条件在整个测量中固定到受限制模式启动。弯曲损耗由弯曲前后输出功率的差异决定。输出功率由光功率计测量。图2显示了这些GI POF的弯曲损耗的结果。当弯曲半径超过5mm时，纤维A的弯曲损耗在655-nm波长下低于0.2dB。在5毫米弯曲半径的情况下，纤维B的弯曲损失为0.58 dB。在弯曲半径超过10mm的情况下，纤维B的弯曲损失在0.4dB下。当弯曲半径为5mm时，纤维C的弯曲损失为0.92dB。当弯曲半径超过10mm时，纤维C的弯曲损失在0.4 dB下。在所有测量条件下，纤维D的弯曲损耗超过0.6 dB。结果，澄清说，在弯曲的弯曲条件下，将具有高Na（0.54）的GI POF的弯曲损失减少。纤维B和C具有超过10mm弯曲半径的相同弯曲损耗。然而，在5mm弯曲半径下，纤维C的弯曲损耗急剧增加。
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