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公开(公告)号：US4410567A
公开(公告)日：1983-10-18
申请号：US368510
申请日：1982-04-15
申请人： Paul W. France , George R. Newns
发明人： Paul W. France , George R. Newns
CPC分类号： B05D7/22 , C03C25/104 , G02B6/443
摘要： In order to provide improved resistance to attack by atmospheric water etc. a clad glass optical fibre has a plastic coating which is in turn coated with a metal coating. The metal coating may in turn be coated with a second plastic coating. The metal coating is formed by drawing the plastic coated fibre through a globule of molten metal, the surface of which is exposed to an oxygen rich atmosphere.
摘要翻译： 为了提供改善的耐大气水侵蚀性能，包覆玻璃光纤具有塑料涂层，其又涂覆有金属涂层。 金属涂层又可以用第二塑料涂层涂覆。 通过将塑料涂覆的纤维通过熔融金属的小球拉伸而形成金属涂层，该熔融金属的表面暴露于富氧气氛中。
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公开(公告)号：US4452508A
公开(公告)日：1984-06-05
申请号：US522527
申请日：1983-08-12
CPC分类号： G02B6/03627 , C03C13/046 , C03C21/00 , C03C3/089 , G02B6/0281
摘要： A range of alkali metal borosilicate glass compositions modified by the addition of alkaline earth metal oxides has been found to be especially suitable for the production of graded index optical fibre using the double crucible method. A core glass from this range may be paired with a suitable cladding glass, which may be another glass from the same range or an unmodified alkali metal borosilicate, so that in the nozzle of the double crucible thermal diffusion takes place to give a composition gradient of alkaline earth metal oxide and hence a refractive index gradient. The fibres thus obtained have better refractive index profiles if the proportions of the oxides in the core and cladding glasses are chosen so as to exclude a simple ion-exchange mechanism. Fibres having numerical apertures of up to 0.268 and best loss values as low as 5.0 dB/km have been prepared.
摘要翻译： 已经发现通过添加碱土金属氧化物改性的一系列碱金属硼硅酸盐玻璃组合物特别适用于使用双坩埚方法生产渐变折射率光纤。 来自该范围的芯玻璃可以与合适的包层玻璃配对，其可以是来自相同范围的另一玻璃或未改性的碱金属硼硅酸盐，使得在双坩埚的喷嘴中进行热扩散，以产生组成梯度 碱土金属氧化物，因此是折射率梯度。 如果选择芯和包层玻璃中的氧化物的比例以排除简单的离子交换机制，则由此获得的纤维具有更好的折射率分布。 已经准备了具有高达0.268的数值孔径和低至5.0dB / km的最佳损耗值的光纤。
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公开(公告)号：US4351659A
公开(公告)日：1982-09-28
申请号：US314779
申请日：1981-10-26
申请人： Keith J. Beales , Clive R. Day , George R. Newns
发明人： Keith J. Beales , Clive R. Day , George R. Newns
IPC分类号： C03B37/00 , C03B37/023 , G02B6/00 , C03C25/02
CPC分类号： C03B37/0235 , C03B2205/56
摘要： A graded index optical fiber is produced in a double crucible with an elongate heated exit nozzle. The core and cladding glasses of the fiber diffuse into one another in the nozzle.
摘要翻译： 在具有细长加热出口喷嘴的双坩埚中产生渐变折射率光纤。 纤维的芯和包层玻璃在喷嘴中彼此扩散。
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公开(公告)号：US4275951A
公开(公告)日：1981-06-30
申请号：US105652
申请日：1979-12-20
CPC分类号： G02B6/03627 , C03C13/046 , C03C3/089 , G02B6/0281
摘要： A range of alkali metal borosilicate glass compositions modified by the addition of alkaline earth metal oxides has been found to be especially suitable for the production of graded index optical fibre by thermal diffusion using the double crucible method. A core glass chosen from this range may be paired with a suitable cladding glass so that, in the nozzle of the double crucible, alkaline earth metal exchange occurs to give a composition gradient of alkaline earth metal oxide and hence a gradation of refractive index. Using these glasses, fibres have been produced having refractive index profiles that approximate closely to the ideal parabolic distribution, numerical apertures of up to 0.21, and best loss values as low as 6.4 dB/km at 850 nm.
摘要翻译： 已经发现通过添加碱土金属氧化物改性的一系列碱金属硼硅酸盐玻璃组合物特别适用于通过使用双坩埚法的热扩散来生产渐变折射率光纤。 从该范围选择的芯玻璃可以与合适的包层玻璃配对，使得在双坩埚的喷嘴中发生碱土金属交换以产生碱土金属氧化物的组成梯度，并因此产生折射率的等级。 使用这些玻璃，已经制造出具有近似于理想抛物线分布的折射率分布，高达0.21的数值孔径以及850nm处最低损耗值低至6.4dB / km的光纤。
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