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公开(公告)号：US4445754A
公开(公告)日：1984-05-01
申请号：US136325
申请日：1980-04-01
CPC分类号： C03C3/064 , C03C13/046 , C03C3/089
摘要： A glass suitable for use as the core glass in a high numerical aperture optical fibre has a composition selected from the range of glasses which comprise(i) from 15 to 25 mole percent of soda,(ii) from 25 to 65 mole percent of silica and germania, taken together, the content of germania not exceeding 42 mole percent,(iii) up to 22.5 mole percent of boric oxide and barium oxide, taken together, the content of boric oxide not exceeding 20 mole percent, and the content of barium oxide not exceeding 12 mole percent, and(iv) from 0.01 to 1 weight percent of a redox buffering agent. The glass can be prepared by controlling the partial oxygen pressure of the melt so that it is approximately 10.sup.-5 atmospheres. An optical fibre can be produced, by using a soda-boro-silicate clad glass, and a core glass having the composition in the above range.
摘要翻译： 适合用作高数值孔径光纤中的芯玻璃的玻璃具有选自以下的组合物：玻璃的范围，其包含（i）15至25摩尔％的苏打，（ii）25至65摩尔％的二氧化硅 和锗酸盐，不超过42摩尔％的锗的含量，（iii）高达22.5摩尔％的氧化硼和氧化钡，氧化硼的含量不超过20摩尔％，钡的含量 氧化物不超过12摩尔％，和（iv）0.01至1重量％的氧化还原缓冲剂。 可以通过控制熔体的部分氧气压力使其达到大约10-5个大气压来制备玻璃。 可以通过使用苏打 - 硼硅酸盐包覆玻璃和具有上述范围的组成的芯玻璃来制造光纤。
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公开(公告)号：US4539033A
公开(公告)日：1985-09-03
申请号：US530359
申请日：1983-09-08
IPC分类号： C03B5/225 , C03B37/023 , C03C3/00 , C03C13/04 , C03B5/00
摘要： An oxide glass is dried by passing through a melt of the glass fluorine or another perhalogenated compound including fluorine atoms. For example, C.sub.3 F.sub.8 (e.g. after pre-cracking) can be used to reduce the OH content of a borosilicate glass, and the loss of an optical fibre drawn from such a glass, to low levels.
摘要翻译： 通过玻璃氟或包含氟原子的其它全卤化化合物的熔体进行干燥氧化玻璃。 例如，可以使用C3F8（例如在预裂化之后）来降低硼硅酸盐玻璃的OH含量和从这种玻璃中提取的光纤的损失到低水平。
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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：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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公开(公告)号：US4675038A
公开(公告)日：1987-06-23
申请号：US856841
申请日：1986-04-21
IPC分类号： C03B37/018 , C03C13/04 , G02B6/036 , C03C25/02
CPC分类号： G02B6/03633 , C03B37/018 , C03B37/01861 , C03C13/045 , G02B6/03627 , C03B2203/24 , Y10S65/90
摘要： An improved method of manufacturing an optical fibre by vapor phase deposition of layers of cladding and core material for an optical fibre on the inside of a tubular substrate, followed by heating of the tube to cause it to collapse into a preform and drawing of the preform to form the fibre, includes performing the collapse with the introduction of chlorine gas acting as a drying agent. An alternative to chlorine gas is a vapor which decomposes in situ to yield chlorine without producing a solid deposit.
摘要翻译： 一种改进的制造光纤的方法，该方法是通过气相沉积在管状基材内部的用于光纤的包层和芯材料层，随后加热该管以使其塌陷成预成型件并预成型件的拉伸 以形成纤维，包括通过引入用作干燥剂的氯气进行塌陷。 氯气的替代品是在原位分解产生氯而不产生固体沉积物的蒸汽。
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公开(公告)号：US4566754A
公开(公告)日：1986-01-28
申请号：US361093
申请日：1982-03-23
IPC分类号： C03B37/023 , C03B37/027 , C03C13/04 , G02B6/00 , C03B37/025
CPC分类号： G02B6/02276 , C03B37/023 , C03B37/027 , C03C13/045 , C03B2201/02 , C03B2201/31 , C03B2203/24 , C03B2203/36 , Y10S65/16
摘要： An optical fibre capable of monomode transmission in, and having a wavelength of zero dispersion in, the 1.55 .mu.m window and having a core comprising silica and germanium dioxide and a cladding comprising silica is drawn from an appropriate preform at a temperature in the range from 1900.degree. C. to 2000.degree. C. Fibres thus produced have low loss compared with fibres drawn at higher temperature.
摘要翻译： 在1.55μm窗口内能够单模传输并具有零色散的光纤并且具有包括二氧化硅和二氧化锗的核心以及包含二氧化硅的包层的光纤在适当的预成型件中从在 1900℃至2000℃。与在较高温度下拉伸的纤维相比，这样生产的纤维具有低损失。
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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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