[특허]Fiber optic cable structure and method

Fitel USA Corp.

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Fiber optic cable structure and method

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국가/구분	United States(US) Patent 등록
국제특허분류(IPC7판)	G02B-006/44
미국특허분류(USC)	385/109; 385/100; 385/111
출원번호	US-0166223 (2002-06-07)
발명자 / 주소	Davis, C. Shawn Debban, H. Paul Dixon, Lisa A. Weimann, Peter A.
출원인 / 주소	Fitel USA Corp.
대리인 / 주소	Thomas, Kayden, Horstemeyer & Risley, LLP
인용정보	피인용 횟수 : 20 인용 특허 : 3

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An optical fiber cable structure including a tube comprised of inorganic fillers dispersed within a soft resin, the tube housing optical fibers or ribbons surrounded by a water blocking material. The use of the inorganic fillers in the soft resin provides a cable structure with superior blowing performance due to low surface friction and high flexibility, allowing more effective installation of the fiber optic cable via blowing techniques The use of the inorganic fillers in the soft resin also reduces the thermal expansion/contraction of the cable struct...

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1. A fiber optic cable structure, the cable structure comprising:a tube, the tube being hollow and containing an interior cavity, wherein the tube comprises:a soft resin, the soft resin having an elastic modulus of 200,000 psi or less at 25° C.; andinorganic fillers disposed in the soft resin so as to decrease the surface friction of the outside surface of the tube;the wherein fillers occupy a volume of the soft resin between 0.5 wt % and 45 wt %. 2. The fiber optic cable structure of claim 1, wherein the fillers are further disposed in the soft resin so as to increase the resistance of the tube to compression from axial loads. 3. The fiber optic cable structure of claim 1, wherein the fillers are further disposed in the soft resin so as to reduce thermal expansion and contraction of the tube. 4. The fiber optic cable structure of claim 1, wherein the soft resin is selected from the group consisting of:polyethylenes, impact-modified polypropylene, polypropylene-based thermoplastic olefins, ethylene-vinyl acetate resins, plasticized polyvinyl chloride, polyester-based thermoplastic elastomers, and polyether-based thermoplastic elastomers. 5. The fiber optic cable structure of claim 1, wherein the tube further comprises an inner layer disposed along an inner surface of the interior cavity of the tube. 6. The fiber optic cable structure of claim 5, wherein the inner layer comprises a resin. 7. The fiber optic cable structure of claim 6, wherein the inner layer comprises a resin containing fillers. 8. A fiber optic cable structure, the cable structure comprising:a tube, the tube being hollow and containing an interior cavity, wherein the tube comprises:a soft resin, the soft resin having an elastic modulus of 200,000 psi or less at 25° C.; andinorganic fillers disposed in the soft resin so as to decrease the surface friction of the outside surface of the tube;wherein the fillers are needlelike. 9. The fiber optic cable structure of claim 8 wherein the fillers are selected from the group consisting of:wollastonite and glass fiber. 10. The fiber optic cable structure of claim 9, wherein the aspect ratio of the fillers is between 5:1 and 100:1. 11. The fiber optic cable structure of claim 8, wherein the tube further comprises an inner layer disposed along an inner surface of the interior cavity of the tube. 12. The fiber optic cable structure of claim 11, wherein the inner layer comprises a resin. 13. The fiber optic cable structure of claim 11, wherein the inner layer comprises a resin containing fillers. 14. A fiber optic cable structure, the cable structure comprising:a tube, the tube being hollow and containing an interior cavity, wherein the tube comprises:a soft resin, the soft resin having an elastic modulus of 200,000 psi or less at 25° C.; and inorganic fillers disposed in the soft resin so as to decrease the surface friction of the outside surface of the tube;wherein the fillers are platelike. 15. The fiber optic cable structure of claim 14, wherein the fillers are selected from the group consisting of:talc, mica, montmorillionite, bentonite, kaolinite clay, smectite clays, synthetic clays, and glass flake. 16. The fiber optic cable structure of claim 15, wherein the aspect ratio of the fillers is between 5:1 and 100:1. 17. The fiber optic cable structure of claim 14, wherein the tube further comprises an inner layer disposed along an inner surface of the interior cavity of the tube. 18. The fiber optic cable structure of claim 17, wherein the inner layer comprises a resin. 19. The fiber optic cable structure of claim 17, wherein the inner layer comprises a resin containing fillers. 20. A fiber optic cable structure, the cable structure comprising:a tube, the tube being hollow and containing an interior cavity, wherein the tube comprises:a soft resin, the soft resin having an elastic modulus of 200,000 psi or less at 25° C.; andinorganic fillers disposed in the soft resin so as to decrease the surface f riction of the outside surface of the tube;wherein the fillers are round. 21. The fiber optic cable structure of claim 20, wherein the fillers are selected from the group consisting of:fumed silica, fumed alumina, glass beads, aluminum trihydrate, and magnesium hydroxide. 22. The fiber optic cable structure of claim 20, wherein the tube further comprises an inner layer disposed along an inner surface of the interior cavity of the tube. 23. The fiber optic cable structure of claim 22, wherein the inner layer comprises a resin. 24. The fiber optic cable structure of claim 22, wherein the inner layer comprises a resin containing fillers. 25. A fiber optic cable structure, the cable structure comprising:a tube, the tube being hollow and containing an interior cavity, wherein the tube comprises:a soft resin, the soft resin having an elastic modulus of 200,000 psi or less at 25° C.; andinorganic fillers disposed in the soft resin so as to decrease the surface friction of the outside surface of the tube;wherein the tube is dimensioned to contain at least twelve fiber optic elements within the interior cavity of the tube. 26. The fiber optic cable structure of claim 25, wherein the tube has an outer diameter of between 1.5 mm and 2.0 mm. 27. The fiber optic cable structure of claim 26, wherein the tube further contains a water blocking material, the water blocking material surrounding the fiber optic elements. 28. The fiber optic cable structure of claim 27, wherein the water blocking material comprises a thixotropic gel. 29. The fiber optic cable structure of claim 27, wherein the water blocking material comprises a dry waterswellable material. 30. The fiber optic cable structure of claim 27, wherein the water blocking material comprises an extruded soft polymer. 31. The fiber optic cable structure of claim 27, wherein the water blocking material comprises a soft crosslinked polymer, wherein the crosslinked polymer is cured by ultraviolet light. 32. The fiber optic cable structure of claim 25, wherein the tube further comprises an inner layer disposed along an inner surface of the interior cavity of the tube. 33. The fiber optic cable structure of claim 32, wherein the inner layer comprises a resin. 34. The fiber optic cable structure of claim 32, wherein the inner layer comprises a resin containing fillers. 35. A fiber optic cable structure, the cable structure comprising:a tube, the tube being hollow and containing an interior cavity, wherein the tube comprises:a soft resin, the soft resin having an elastic modulus of 200,000 psi or less at 25° C.; andinorganic fillers disposed in the soft resin so as to decrease the surface friction of the outside surface of the tube;wherein the tube further comprises impact-modified polypropylene containing 30 wt % talc fillers. 36. The fiber optic cable structure of claim 35, wherein the tube further comprises an inner layer disposed along an inner surface of the interior cavity of the tube. 37. The fiber optic cable structure of claim 36, wherein the inner layer comprises a resin. 38. The fiber optic cable structure of claim 36, wherein the inner layer comprises a resin containing fillers. 39. A method of manufacturing a fiber optic cable, the method comprising the steps of:providing a soft resin;adding inorganic fillers to the soft resin; andforming the soft resin containing the fillers into a hollow tube;wherein the tube has a central cavity;wherein the fillers added to the soft resin decrease the surface friction of the outside surface of the tube, and increase the resistance of the tube to compression by axial loads; andwherein the soft resin contains at least 0.5 wt % fillers. 40. The method of claim 39, wherein the method further comprises the step of adding a coupling agent to the resin to aid in dispersion of the fillers in the soft resin. 41. The method of claim 39, wherein the method further comprises the step of adding an ultraviolet stabilizer to the soft resin. 42. The me thod of claim 41, wherein the ultraviolet stabilizer comprises carbon black. 43. The method of claim 39, wherein the method further comprises the step of adding an anti-static agent to the soft resin. 44. The method of claim 39, wherein the method further comprises the step of forming an inner layer disposed on an inner surface of the cavity of the tube. 45. A method of manufacturing a fiber optic cable, the method comprising the steps of:providing a soft resin;adding inorganic fillers to the soft resin; andforming the soft resin containing the fillers into a hollow tube;wherein the tube has a central cavity;wherein the fillers added to the soft resin decrease the surface friction of the outside surface of the tube, and increase the resistance of the tube to compression by axial loads; andwherein the aspect ratio of the fillers is at least 5:1. 46. A method of manufacturing a fiber optic cable, the method comprising the steps of:providing a soft resin;adding inorganic fillers to the soft resin; andforming the soft resin containing the fillers into a hollow tube;wherein the tube has a central cavity;wherein the fillers added to the soft resin decrease the surface friction of the outside surface of the tube, and increase the resistance of the tube to compression by axial loads;wherein the method further comprises the step of forming an inner layer disposed on an inner surface of the cavity of the tube; andwherein the inner layer comprises a second resin.

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Fiber optic cable structure and method

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