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公开(公告)号：US5074633A
公开(公告)日：1991-12-24
申请号：US562768
申请日：1990-08-03
CPC分类号： G02B6/2551 , H01S3/06708 , H01S3/06745
摘要： Disclosed is an optical communication system comprising at least two optical fibers of dissimilar core sizes, joined by a fusion splice. In one embodiment, the larger-core fiber is a communication fiber, and the smaller-core fiber is an erbium-doped amplifier fiber. A taper region is included adjacent the splice. The diameter of the smaller-core fiber increases within the taper region as the splice is approached along the smaller-core fiber. The taper region is substantially free of constrictions. As a consequence of the taper region, the optical losses associated with the splice are relatively low, even when there is relatively high mismatch between the mode field diameters (at a signal wavelength) in the respective fibers.
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公开(公告)号：US5243674A
公开(公告)日：1993-09-07
申请号：US936685
申请日：1992-08-27
申请人： Edwin A. Chandross , John T. Krause
发明人： Edwin A. Chandross , John T. Krause
CPC分类号： G02B6/2558 , G02B6/245 , G02B6/2551
摘要： Fusion splicing of optical fiber generally requires removal of a polymer coating from the end portions of two lengths of fiber. A conventional removal method involves immersion of the fiber ends in an appropriate polymer stripping liquid, e.g., in hot, concentrated sulfuric acid. It is known that the strength of fusion splices generally is statistically distributed, such that there exists a probability that a given splice will pass at a given proof test level. We have found that the splice strength distribution can be shifted towards higher strength if the polymer stripping liquid comprises means for insuring that the liquid is essentially free of strength-reducing particles. Preferred means are concentrated nitric acid. Exemplarily, the liquid is at a temperature in the range 170.degree.-200.degree. C. and comprises concentrated (about 95%) sulfuric acid and about 5% b.v. concentrated (about 70%) nitric acid.
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公开(公告)号：US4713105A
公开(公告)日：1987-12-15
申请号：US935162
申请日：1986-11-25
CPC分类号： G02B6/2551
摘要： In the interest of producing high-strength splice connections between silica-based glass fibers a method of using a tri-particle flow of gases for flame fusion is disclosed. An outer relatively high-velocity flow of oxygen surrounds an intermediate, lower-velocity flow of chlorine or oxygen which in turn surrounds a central flow of H.sub.2, D.sub.2, NH.sub.3, or ND.sub.3.Particularly high strengths are achieved when a central flow of hydrogen or deuterium and an intermediate flow of chlorine are used in such a fashion as to heat fiber ends to be spliced to temperatures of 500 degrees C. and beyond only after these ends have been enveloped by chlorine.
摘要翻译： 为了生产二氧化硅基玻璃纤维之间的高强度接头连接，公开了一种使用三粒子气流进行火焰熔融的方法。 外部相对高速的氧气流围绕中间的较低速度的氯或氧气流，其又包围H2，D2，NH3或ND3的中心流。 当以这样的方式使用氢气或氘气和中间氯流的中心流动时，特别高的强度是将待接合至500摄氏度的温度的纤维端部加热，并且仅在这些端部被这些端部包围之后 氯。
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公开(公告)号：US5487125A
公开(公告)日：1996-01-23
申请号：US333566
申请日：1994-11-02
CPC分类号： G02B6/2551
摘要： We have discovered that the strength of arc fusion splices in optical fiber can be adversely affected by particles (e.g., SiO.sub.2 particles) from the electrodes. Disclosed is a method of arc fusion splicing that can substantially increase the probability that a given fiber splice will meet a given strength requirement. The method comprises initiating the arc in a "cleaning" position selected such that the probability of incidence on the fibers of particles from the electrodes is relatively low, followed by changing the relative position between the electrodes with the arc therebetween and the fibers to the conventional "heating" position and forming the splice.
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公开(公告)号：US5623570A
公开(公告)日：1997-04-22
申请号：US589314
申请日：1996-01-22
CPC分类号： G02B6/2558 , G02B6/2551
摘要： The disclosed method of fusion splicing silica-based optical fiber comprises removing of the polymer coating from the end portions of the respective fibers by contacting the end portions with a chemical polymer remover (e.q., hot sulfuric acid with 5% nitric acid) such that a film of material that comprises the remover remains on the stripped fiber. Typically this is accomplished by refraining from the conventional rinsing of the stripped fiber portions. The film-covered stripped fibers are then fusion spliced in conventional fashion. Splices of strength close to the strength of as-drawn fiber were obtained by this method.
摘要翻译： 所公开的融合二氧化硅基光纤的方法包括通过使端部与化学聚合物去除剂（eq，具有5％硝酸的热硫酸）接触，从各纤维的端部除去聚合物涂层，使得 包含去除剂的材料膜保留在剥离的纤维上。 通常，这是通过避免常规漂洗剥离的纤维部分来实现的。 然后将覆盖膜的剥离的纤维以常规方式熔接。 通过该方法得到接近拉伸纤维强度的接头。
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公开(公告)号：US5414788A
公开(公告)日：1995-05-09
申请号：US267704
申请日：1994-06-28
CPC分类号： G02B6/2558 , G02B6/2551
摘要： We have discovered that the strength of arc fusion splices in optical fiber can be adversely affected by particles (e.g., SiO.sub.2 particles) from the electrodes. Disclosed is a method of arc fusion splicing that can substantially increase the probability that a given fiber splice will meet a given strength requirement. The method comprises initiating the arc in a "cleaning" position selected such that the probability of incidence on the fibers of particles from the electrodes is relatively low, followed by changing the relative position between the electrodes with the arc therebetween and the fibers to the conventional "heating" position and forming the splice.
摘要翻译： 我们已经发现，光纤中的电弧熔接的强度可能受到来自电极的颗粒（例如，SiO 2颗粒）的不利影响。 公开了一种电弧熔接方法，其可以显着增加给定光纤接头将满足给定强度要求的可能性。 该方法包括在选择的“清洁”位置启动电弧，使得来自电极的颗粒的纤维的入射概率相对较低，随后改变电极之间的电弧之间的相对位置，并且将纤维改变为常规 “加热”位置并形成拼接。
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公开(公告)号：US4689065A
公开(公告)日：1987-08-25
申请号：US829527
申请日：1986-02-14
申请人： John T. Krause
发明人： John T. Krause
IPC分类号： G02B6/24 , C03B23/043 , C03B23/207 , C03B37/027 , C03B37/15 , G02B6/00 , G02B6/255 , C03B37/023
CPC分类号： G02B6/2551 , C03B23/043 , C03B23/207 , C03B37/02736 , C03B37/15 , C03B2205/30 , C03B2205/68
摘要： In the interest of reducing the effect on tensile strength of flame processing of a silica-based optical fiber waveguide, such processing is by a method in which a significant flow of oxygen surrounds a flame produced by combustion of hydrogen, deuterium, ammonia, or deuterated ammonia. Flame processing may be for purposes such as, e.g., fiber drawing, fiber fusing for the sake of lateral coupling, refractive index modification by the diffusion of dopants, and fiber splicing in the manufacture of long lengths of fiber. Even though there is no use of chlorine, at least 80 percent of spliced fibers have a tensile strength greater than or equal to 500 kpsi (3.45 GPa) as is desirable in optical fiber cable manufacture.
摘要翻译： 为了减少对二氧化硅基光纤波导的火焰加工的拉伸强度的影响，这种处理是通过一种方法，其中显着的氧气流包围由氢，氘，氨或氘代的燃烧产生的火焰 氨。 火焰处理可以用于例如纤维拉伸，为了横向耦合的光纤熔合，通过掺杂剂的扩散的折射率改性以及在长的纤维长度的制造中的纤维拼接。 即使不使用氯，至少80％的拼接纤维的拉伸强度大于或等于500kpsi（3.45GPa），如在光缆制造中所希望的。
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