公开(公告)号：EP0434237A2

公开(公告)日：1991-06-26

申请号：EP90312789.2

申请日：1990-11-23

申请人： AT&T Corp.

发明人： Glodis, Paul Francis ,  Walker, Kenneth Lee

IPC分类号： C03B37/012 ,  G02B6/22

CPC分类号： G02B6/03655 ,  C03B37/01211 ,  C03B2203/22 ,  C03B2203/24 ,  G02B6/03605 ,  G02B6/03627 ,  G02B6/0365 ,  Y02P40/57

摘要： The inventive method of producing optical fiber comprises producing a rod-like silica-based body, overcladding the body with pre-existing silica-based glass, and drawing fiber from the thus produced preform. The rod-like body comprises a core (10) and a first cladding (11) that surrounds the core, both consisting of deposited glass, and further comprises a second cladding (e.g., 12) that surrounds the first cladding and that is derived from a substrate tube that has a refractive index n₂ o , the refractive index of vitreous silica. The overcladding (e.g., 13) comprises pre-existing glass, and comprises a third cladding region that has a refractive index n₃ ≦. n o . Typically, the overcladding material is derived from one or more overcladding tubes. The inventive method can be used to produce preforms capable of yielding more fiber than prior art rod-in-tube preforms, potentially resulting in significant cost reduction without performance penalties. A variety of advantageous embodiments of the inventive methods, as well as of fiber produced by the method, are disclosed.

摘要翻译： 生产光纤的根据本发明的方法包括生产棒状二氧化硅基体，与预先存在的基于二氧化硅的玻璃包覆的主体，并且从由此产生的预制件拉制纤维。 杆状主体包括芯部（10）和一个第一包层（11）那样围绕芯，这两个由...组成沉积玻璃的，并且还包括第二包层（例如，12）做了包围第一包层并没有源自 管基板那样具有折射率n2 <没有，石英玻璃的折射率。 外包（E. G.，13）包括预先存在的玻璃，并且包括第三包层区域确实具有折射率n3

公开(公告)号：EP0256248A3

公开(公告)日：1989-09-13

申请号：EP87108765.6

申请日：1987-06-19

申请人： AT&T Corp.

发明人： Gartside III, Charles Henry ,  Glodis, Paul Francis ,  Patel, Parbhubhai Dahyabhai

IPC分类号： G02B6/44

CPC分类号： G02B6/03627 ,  G02B6/02395 ,  G02B6/4429 ,  G02B6/4494

摘要： An optical fiber cable (20) includes a core (21) comprising plurality of units (22-22). Each unit is formed by a plurality of optical fibers (24-24) which are assembled together without intended stranding. Each of the optical fibers indudes a core, and inner and outer claddings with the inner cladding characterized by an index of refraction depressed from that of the outer cladding. The ratio of the inner cladding diameter to the core diameter and the ratio of the difference in the indices of refraction of the inner and outer claddings to the difference in indices of refraction between the core and the inner cladding are such that each optical fiber is capable of operation in a single mode fashion at a predetermined wavelength. Also, the difference between the indices of refraction of the core and the inner cladding is sufficiently high to cause each fiber to be substantially insensitive to microbending. The plurality of units are enclosed in a common tube (34) which provides a predetermined packing density. In one embodiment, a waterblocking material (46) is disposed within the tube to fill the interstices between the optical fibers and between the units. The waterblocking material is such that its critical yieldstress does not exceed about 70 Pa at 20°C and such that it has a shear modulus of less than about 13 KPa at 20°C. The common tube is enclosed with a sheath system. This arrangement is such that the optical performance of the cable is not degraded at temperatures as low as -40°F.

公开(公告)号：EP0256248B1

公开(公告)日：1994-03-09

申请号：EP87108765.6

申请日：1987-06-19

申请人： AT&T Corp.

发明人： Gartside III, Charles Henry ,  Glodis, Paul Francis ,  Patel, Parbhubhai Dahyabhai

IPC分类号： G02B6/44

CPC分类号： G02B6/03627 ,  G02B6/02395 ,  G02B6/4429 ,  G02B6/4494

公开(公告)号：EP0434237B1

公开(公告)日：1995-03-01

申请号：EP90312789.2

申请日：1990-11-23

申请人： AT&T Corp.

发明人： Glodis, Paul Francis ,  Walker, Kenneth Lee

IPC分类号： C03B37/012 ,  G02B6/22

CPC分类号： G02B6/03655 ,  C03B37/01211 ,  C03B2203/22 ,  C03B2203/24 ,  G02B6/03605 ,  G02B6/03627 ,  G02B6/0365 ,  Y02P40/57

公开(公告)号：EP0434237A3

公开(公告)日：1992-02-26

申请号：EP90312789.2

申请日：1990-11-23

申请人： AT&T Corp.

发明人： Glodis, Paul Francis ,  Walker, Kenneth Lee

IPC分类号： C03B37/012 ,  G02B6/22

CPC分类号： G02B6/03655 ,  C03B37/01211 ,  C03B2203/22 ,  C03B2203/24 ,  G02B6/03605 ,  G02B6/03627 ,  G02B6/0365 ,  Y02P40/57

摘要： The inventive method of producing optical fiber comprises producing a rod-like silica-based body, overcladding the body with pre-existing silica-based glass, and drawing fiber from the thus produced preform. The rod-like body comprises a core (10) and a first cladding (11) that surrounds the core, both consisting of deposited glass, and further comprises a second cladding (e.g., 12) that surrounds the first cladding and that is derived from a substrate tube that has a refractive index n₂ o , the refractive index of vitreous silica. The overcladding (e.g., 13) comprises pre-existing glass, and comprises a third cladding region that has a refractive index n₃ ≦. n o . Typically, the overcladding material is derived from one or more overcladding tubes. The inventive method can be used to produce preforms capable of yielding more fiber than prior art rod-in-tube preforms, potentially resulting in significant cost reduction without performance penalties. A variety of advantageous embodiments of the inventive methods, as well as of fiber produced by the method, are disclosed.

公开(公告)号：EP0256248A2

公开(公告)日：1988-02-24

申请号：EP87108765.6

申请日：1987-06-19

申请人： AT&T Corp.

发明人： Gartside III, Charles Henry ,  Glodis, Paul Francis ,  Patel, Parbhubhai Dahyabhai

IPC分类号： G02B6/44

CPC分类号： G02B6/03627 ,  G02B6/02395 ,  G02B6/4429 ,  G02B6/4494

摘要： An optical fiber cable (20) includes a core (21) comprising plurality of units (22-22). Each unit is formed by a plurality of optical fibers (24-24) which are assembled together without intended stranding. Each of the optical fibers indudes a core, and inner and outer claddings with the inner cladding characterized by an index of refraction depressed from that of the outer cladding. The ratio of the inner cladding diameter to the core diameter and the ratio of the difference in the indices of refraction of the inner and outer claddings to the difference in indices of refraction between the core and the inner cladding are such that each optical fiber is capable of operation in a single mode fashion at a predetermined wavelength. Also, the difference between the indices of refraction of the core and the inner cladding is sufficiently high to cause each fiber to be substantially insensitive to microbending. The plurality of units are enclosed in a common tube (34) which provides a predetermined packing density. In one embodiment, a waterblocking material (46) is disposed within the tube to fill the interstices between the optical fibers and between the units. The waterblocking material is such that its critical yieldstress does not exceed about 70 Pa at 20°C and such that it has a shear modulus of less than about 13 KPa at 20°C. The common tube is enclosed with a sheath system. This arrangement is such that the optical performance of the cable is not degraded at temperatures as low as -40°F.

摘要翻译： 光缆（20）包括具有多个单元（22-22）的芯（21）。 每个单元由多个光纤（24-24）形成，这些光纤被组装在一起而没有预期的绞合。 每个光纤包括芯，并且具有内部包层的内部和外部包层的特征在于折射率从外部包层的折射率折射。 内包层直径与纤芯直径的比值以及内包层和外包层的折射率之差与纤芯和内包层之间的折射率之差的比率使得每个光纤能够 在单一模式下以预定波长进行操作。 此外，芯和内包层的折射率之间的差异足够高，使得每根纤维对微弯曲基本上不敏感。 多个单元被封装在提供预定包装密度的公共管（34）中。 在一个实施例中，防水材料（46）设置在管内以填充光纤之间的间隙和单元之间。 防水材料使得其临界屈服应力在20℃下不超过70Pa，并且其在20℃下的剪切模量小于约13KPa。普通管被护套系统封闭。 这种布置使得电缆的光学性能在低至-40°F的温度下不降解。