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公开(公告)号：US4744631A
公开(公告)日：1988-05-17
申请号：US91327
申请日：1987-08-31
IPC分类号： G02B6/44
CPC分类号： G02B6/4411 , G02B6/4401
摘要： A single mode optical fiber ribbon cable is disclosed. In preferred embodiments, the cable comprises a filling compound having a critical yield stress less than about 70 Pa at 20.degree. C. and/or fibers having a coating that comrises a low modulus (less than about 1.5.multidot.10.sup.6 Pa at 20.degree. C.) inner coating and a high modulus (more than 10.sup.8 Pa at 20.degree. C.) outer coating. Communication cable according to the invention can have low cabling loss, is adapted for array joining, can have high fiber density, and can advantageously be used in short-haul applications such as for metropolitan trunk lines or loop, as well as for long-haul applications.
摘要翻译： 公开了一种单模光纤带状电缆。 在优选的实施方案中，电缆包括在20℃下具有小于约70Pa的临界屈服应力的填充化合物和/或具有低模量（在20℃下小于约1.5×10 6 Pa）的涂层的纤维， 内涂层和高模量（20℃下超过108Pa）外涂层。 根据本发明的通信电缆可以具有低布线损耗，适用于阵列连接，可具有高光纤密度，并且可以有利地用于短距离应用中，例如用于大城市干线或环路以及长距离 应用程序。
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公开(公告)号：US4859023A
公开(公告)日：1989-08-22
申请号：US304203
申请日：1981-09-21
CPC分类号： G02B6/4401 , G02B6/4411 , G02B6/4486 , G02B6/4494
摘要： Optical fiber cables have an inner sheath extruded or otherwise applied to surround optical fibers. If the fibers are coupled to the sheath, substantial shrinkage of the sheath during manufacturing induces microbending losses in the optical fibers. The inventive technique involves choosing a sheath material having a low viscoelastic modulus, typically PVC, and the application of tension thereto during or after extrusion that prevents such shrinkage. This approach typically avoids the necessity of including longitudinal compressive strength members in the cable. A filled optical fiber cable having a flexible gel to prevent water entry advantageously uses the present technique.
摘要翻译： 光纤电缆具有挤出或以其它方式施加以围绕光纤的内护套。 如果纤维耦合到护套，则在制造过程中鞘的显着收缩会导致光纤中的微弯曲损失。 本发明的技术包括选择具有低粘弹性模量（通常为PVC）的护套材料，以及在挤出期间或之后施加张力以防止这种收缩。 这种方法通常避免了在电缆中包括纵向抗压强度构件的必要性。 具有柔性凝胶以防止水进入的填充光纤电缆有利地使用本技术。
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3.发明授权Methods of and apparatus for controlling core-to-sheath length ratio in lightguide fiber cable and cable produced by the methods 失效通过该方法制造的光导纤维电缆和电缆中的芯 - 鞘长度比的控制方法和装置
公开(公告)号：US4446686A
公开(公告)日：1984-05-08
申请号：US414229
申请日：1982-09-02
CPC分类号： G02B6/4479 , G02B6/4484
摘要： In the manufacture of a lightguide fiber cable (21) in which a lightguide fiber core (32) is loosely disposed in a composite sheath 40 it is important to control the ratio of the lengths of the core and sheath. A core which is shorter than the sheath and which follows a shortened path on a reel may be unduly strained when the cable is installed in the field. This problem is overcome by coupling the core to the sheath by a system (25) which includes a constant speed linear capstan (146) and a relatively large variable speed sheave (150) that is positioned between the linear capstan and a takeup reel (154). The coupling of the core to the sheath is accomplished on the sheave after the sheath is elongated between the linear capstan and the sheave. The coupling and the elongation cooperate to compensate for the inherent shortfall in core length which otherwise would occur when the cable is wound on a reel. As a result, when tension forces that have been applied to the sheath are reduced, the sheath, which includes strength members having a relatively high modulus of elasticity, recovers to its original length and the ratio of the length of the core to that of the sheath becomes a predetermined value.
摘要翻译： 在制造其中光导纤维芯（32）松散地设置在复合护套40中的光导纤维电缆（21）时，重要的是控制芯和芯的长度比。 当电缆安装在现场时，短于护套并且沿着卷轴上的缩短路径的芯可能不适当地变紧。 通过将系统（25）耦合到护套来克服该问题，该系统包括恒速线性绞盘（146）和位于线性绞盘与收紧卷轴（154）之间的相对较大的可变速度滑轮（150） ）。 在护套在线性绞盘和滑轮之间延伸之后，芯线与护套的耦合在滑轮上完成。 耦合和伸长率协调以补偿当电缆缠绕在卷轴上时将发生的芯长度的固有不足。 结果，当已经施加到护套的张力减小时，包括具有相对较高弹性模量的强度构件的护套恢复到其原始长度，并且芯的长度与 护套成为预定值。
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公开(公告)号：US5109457A
公开(公告)日：1992-04-28
申请号：US649628
申请日：1991-02-01
IPC分类号： G02B6/44
CPC分类号： G02B6/4495 , G02B6/4415 , G02B6/4429 , G02B6/4432 , G02B6/4433 , G02B6/4494
摘要： A totally dielectric cable includes a core (21) comprising a plurality of optical fiber transmission media (24--24). The core is enclosed by a core tube (34) which is made of a plastic material and water blocking provisions are provided within the core tube for preventing the longitudinal migration of water. A water blocking tape (44) may be provided in engagement with an outer surface of the core tube and a plastic jacket is extruded thereover. Interposed between the outer surface of the jacket and the core tube are two diametrically opposed pluralities (60--60) of strength members each of which may be made of glass fibers. At least one strength member (62) of each plurality is rod-like to provide compressive as well as tensile strength for the cable. The remaining strength members of each plurality are relatively flexible rovings (64--64) which supplement the tensile strength of the rod-like members. The strength members are disposed and have a stiffness modulus which are effective to minimize any tensile strain which is imparted to the rovings.
摘要翻译： 全介电电缆包括包括多个光纤传输介质（24-24）的芯（21）。 芯部由芯管（34）包围，该芯管由塑料材料制成，并且在芯管内设置防水装置以防止水的纵向迁移。 可以将防水胶带（44）设置成与芯管的外表面接合，并且在其上挤出塑料夹套。 插入夹套的外表面和芯管之间的两个直径相对的多个（60-60）的强度构件，每个强度构件可以由玻璃纤维制成。 每个至少一个强度构件（62）是杆状的，以为电缆提供压缩和拉伸强度。 每个多个的剩余强度构件是相对柔性的粗纱（64-64），其补充棒状构件的拉伸强度。 强度构件被设置并且具有刚度模量，其有效地使赋予粗纱的任何拉伸应变最小化。
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公开(公告)号：US4896940A
公开(公告)日：1990-01-30
申请号：US309897
申请日：1989-02-10
IPC分类号： G02B6/44
CPC分类号： G02B6/4436 , G02B6/4403 , G02B6/443 , G02B6/4435
摘要： An optical fiber cable (20) which may be used in a high temperature environment for a substantial period of time without degradation of transmission includes an optical fiber core (22) which is enclosed by an inner tubular member (32) having suitable temperature resistant properties. A braided metallic outer tubular member (50) encloses the inner tubular member and provides suitable mechanical protection and strength for the cable. The integrity of the cable and its performance is further enhanced by a corrugated metallic tube having a sealed periphery and being interposed between the inner and outer tubular members to prevent the ingress of liquid contaminants and to provide the cable with flexibility.
摘要翻译： 可在相当长的一段时间内在高温环境中使用而不会降低透光率的光缆（20）包括由具有适当耐温特性的内管状构件（32）包围的光纤芯（22） 。 编织金属外管状构件（50）围绕内管状构件并为电缆提供合适的机械保护和强度。 通过具有密封周边的波纹状金属管进一步增强了电缆的完整性及其性能，该金属管被插入在内管状构件和外管状构件之间，以防止液体污染物的进入并为电缆提供柔性。
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公开(公告)号：US5234198A
公开(公告)日：1993-08-10
申请号：US720988
申请日：1991-06-25
申请人： Albert L. Hale , Manuel R. Santana , Kirk P. Wells
发明人： Albert L. Hale , Manuel R. Santana , Kirk P. Wells
CPC分类号： G02B6/4464
摘要： Optical fiber (20) which may be disposed in the form of a ribbon (28,30), for example, is caused to become disposed in a conduit (42) such as a duct which may exist in the field by introducing the optical fiber and a pressurized liquid transporting medium (37) into the conduit. The liquid transporting medium is effective to cause the optical fiber to be moved along in the conduit to cause a leading end of the fiber to emerge from a far end of the conduit and be accessible for connective arrangements, for example.
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公开(公告)号：US5199096A
公开(公告)日：1993-03-30
申请号：US785602
申请日：1991-10-30
IPC分类号： G02B6/44
CPC分类号： G02B6/4415 , G02B6/4403 , G02B6/443
摘要： A steam-resistant optical fiber cable (20) includes a core (21) comprising a plurality of optical fiber ribbons (22,22) disposed within a tubular member (30) comprised of a high temperature resistant material. The tubular member is disposed within a hermetic sealing member (40) which comprises a metal of low electrochemical activity having a sealed seam. An outer jacket (50) is disposed about the hermetic sealing member and in a preferred embodiment is characterized by resistance to degradation in high temperature, high humidity environments. The core may be unfilled or filled with a waterblocking material and in a preferred embodiment, a waterblocking member is interposed between the tubular member and the hermetic sealing member.
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公开(公告)号：US5243675A
公开(公告)日：1993-09-07
申请号：US869405
申请日：1992-04-16
IPC分类号： G02B6/44
CPC分类号： G02B6/4436 , G02B6/4403 , G02B6/4494
摘要： A hermetically sealed optical fiber cable (20) includes a core (21) comprising a plurality of optical fiber ribbons (22,22) disposed within a core tube (30) comprised of a high temperature resistant polymeric material. The core tube is disposed within a hermetic sealing member (40) which comprises a metal of low electrochemical activity having a sealed seam. An outer jacket (50) is disposed about the hermetic sealing member. The core may be filled with a waterblocking filling material (35). The material of the core tube undergoes only limited degradation because of the limited amount of oxygen and/or moisture trapped in the hermetically sealed cable. The filling material and/or other materials of the cable scavenge moisture and oxygen which travel longitudinally of the cable and reach portions of the cable subjected to a high temperature because of a leak in an adjacent steam line. The filling material and/or other materials are such that they cooperate with polymeric materials of the cable to prevent oxygen and humidity from degrading coating material of the optical fiber. Further, the filling material and the core tube are such that degradation of the core tube in the hermetically sealed cable is avoided.
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公开(公告)号：US4844575A
公开(公告)日：1989-07-04
申请号：US36954
申请日：1987-04-10
申请人： Michael D. Kinard , Andrew J. Panuska , Mickey R. Reynolds , Manuel R. Santana , George H. Webster
发明人： Michael D. Kinard , Andrew J. Panuska , Mickey R. Reynolds , Manuel R. Santana , George H. Webster
CPC分类号： G02B6/443 , G02B6/4426 , G02B6/4432 , G02B6/4433 , G02B6/4434 , G02B6/4494 , H01B7/285
摘要： An optical fiber cable (20) includes a core (21) comprising at least one optical fiber (24) which is enclosed in a tubular member (34) and which includes a sheath system (40). The sheath system includes two strength members 42--42 which extend linearly longitudinally along the cable parallel to a longitudinal axis (29) of the cable. The strength members are enclosed in a plastic jacket (46). The strength members have predetermined relative tensile and compressive stiffnesses. The stiffnesses are such that the strength members are capable of withstanding expected compressive as well as tensile loading and are coupled sufficiently to the jacket to provide a composite arrangement which is effective to inhibit contraction and which controls the position of the neutral axis during bending while providing suitable flexibility. The strength members in a preferred embodiment are made of a metallic material such as steel and have tensile and compressive stiffness which are substantially equal to cause the plane of bending to extend through the strength members. In other embodiments, the core is filled with a waterblocking material, the tubular member is enclosed by a water absorbent tape and/or a metallic shield and metallic conductors may extend colinearly with the strength members.
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公开(公告)号：US4555175A
公开(公告)日：1985-11-26
申请号：US475620
申请日：1983-03-15
IPC分类号： G01B11/02
CPC分类号： G01B11/02
摘要： Compressive strain in cabled optical fibers can cause buckling of the fibers and resulting microbending loss. To measure the longitudinal compression in cabled optical fibers, a modulated laser beam is directed through a first fiber and looped back to the origin by a second fiber. Next, the cable is stretched until tensile strain is indicated by a change in phase of the modulated signal. The amount of stretching required indicates the degree of compression on the fibers in the unstretched cable, and hence the amount of excess length of fiber in the cable. To measure excess fiber in relatively long lengths of cable, a portion of the cable can remain reeled, and the strain applied to the unreeled portion. A correction factor can be determined for slippage between the fiber and sheath in the reeled portion.
摘要翻译： 电缆光纤中的压缩应变可能导致纤维的弯曲并导致微弯损失。 为了测量电缆光纤中的纵向压缩，调制的激光束被引导通过第一光纤并通过第二光纤环回原点。 接下来，电缆被拉伸直到拉伸应变由调制信号的相位变化表示。 所需的拉伸量表示未拉伸电缆中的纤维上的压缩程度，因此在电缆中的纤维过长的量。 为了测量较长长度的电缆中的多余纤维，电缆的一部分可以保持卷绕，并且应变施加到未拉伸部分。 可以确定卷绕部分中的纤维和护套之间的滑动的校正因子。
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