Armored optical fiber cable interconnection for dual payout systems

• US 5,054,868 A
• Filed: 08/29/1990
• Issued: 10/08/1991
• Est. Priority Date: 08/29/1990
• Status: Expired due to Fees

• Current Assignee: the united states of america as represented by the secretary of the navy
• Original Assignee: the united states of america as represented by the secretary of the navy
• Inventors: Marten, Andrew W., Duff, Harold S., Hoban, Fay A.
• Primary Examiner(s): Lee, John D.
• Assistant Examiner(s): BARNS, STEPHEN
• Application Number:
  US07/576,250
• Time in Patent Office: 405 Days
• Field of Search: 350/96.2, 350/96.21, 350/96.23
• US Class Current: 385/99
• CPC Class Codes: G02B 6/2558 Reinforcement of splice joint
• CPC Class Codes: G02B 6/4431 with provision in the protective covering, e.g. weak line, for gaining access to one or more fibres, e.g. for branching or tapping break-out terminations G02B6/4471
• CPC Class Codes: G02B 6/4475 with provision for lateral branching G02B6/4431 takes precedence
• CPC Class Codes: G02B 6/4476 with heat-shrinkable elements

Abstract

An armored optical fiber cable interconnection and method of making the irconnection with a self-sealing, low-strength joint with relatively low optical attenuation, has an inner fiber carrying jacket, an outer protective jacket, and an intermediate armored jacket of stranded material. The interconnection ends are assembled with a doubled layer of armored jacket over an intermediate protective jacket portion all sealed and held in place with a length of shrink tubing over the jackets and a retaining bead with an o-ring fitting over the assembly and against the shrink tubing over the retaining bead.

Claims

1. An armored interconnection for an optic fiber cable, comprising:

an interconnection defined by a plurality of layered coverings, including an outer protective jacket and an intermediate armored jacket relative to the outer protective jacket, the interconnection having one end portion and another opposite end portion, the interconnection defining an opening intermediate the end portions for providing access to the interior of the interconnection, an end portion of the intermediate armored jacket extending towards its opposing end portions and over the outer protective jacket;

means for carrying an optical fiber enclosed within the interconnection;

opposing lengths of optical fiber carried within the carrying means, one length of optical fiber extending through the interconnection from one end portion and another length of optical fiber extending from the other end portion;

splice means connecting the optical fiber, the splice means located proximate the interconnection opening;

retaining means for retaining the intermediate armored jacket portion at each end of the interconnection, the retaining means located at the one end and the other end, the retaining means enclosed within each opposite extending intermediate armored jacket;

a plurality of closure means for enclosing and sealing the interconnection end portions, the retaining means and the opposite extending intermediate armored jacket portions, and the intermediate opening; and

gasket means for restraining, strengthening and further sealing the respective intermediate armored jacket and closure means over associated retaining means.

2. An armored interconnection as set forth in claim 1 wherein the optical fiber carrying means comprises the outer protective jacket, the intermediate armored jacket, and an inner fiber carrying jacket.

3. An armored interconnection as set forth in claim 1 wherein the retaining means comprise a retainer bead fitting over respective interconnection end portions and outer protective jacket of the interconnection.

4. An armored interconnection as set forth in claim 1 wherein the gasket means comprise an o-ring fitting over respective interconnection end portions, and the outer protective jacket of the interconnection and closure means.

5. An armored interconnection as set forth in claim 1 wherein the intermediate armored jacket comprises a stranded protective layer in which the strands separate in order to allow access to the optical fiber carrying means.

6. An armored interconnection as set forth in claim 1 wherein the closure means comprise lengths of shrink tubing.

7. An armored interconnection as set forth in claim 1 wherein the interconnection length between retaining means is approximately 1.8 times the distance between a free length of the fiber optic cable.

8. An armored interconnection for an optic fiber cable, comprising:

a multi-layer service loop including a plurality of protective layers;

the protective layers comprising;

an inner fiber carrying jacket,

an outer protective jacket, and

an intermediate jacket of a stranded armor material;

opposite lengths of spliced fiber optic cable entering the service loop from opposing service loop ends and having a splice enclosed within the service loop and the inner fiber optic carrying jacket;

one service loop end portion assembly, the assembly comprising an end portion of the intermediate armored jacket folded over the associated end of the service loop, thereby forming a sealed multiple layer end assembly comprising a double armored jacket and an outer protective jacket;

another service loop end portion assembly, the other assembly comprising another end portion of the intermediate armored layer folded over the associated other end of the service loop, thereby forming a sealed multiple layer end assembly comprising another double armored jacket and another outer protective jacket;

one retainer bead enclosed within the one service loop end portion assembly;

another retainer bead enclosed within the other service loop end portion assembly;

closure means for each service loop end assembly, the closure means enclosing and sealing therein the intermediate armored jacket and retaining bead of the respective service loop end assemblies; and

gasket means for each service loop end assembly, the gasket means restraining and further sealing respective closure means over each double layered intermediate armored jacket and outer protective jacket.

9. An armored interconnection as set forth in claim 8 further comprising:

an opening defined by the outer protective jacket of the service loop, the opening located intermediate the ends of the service loop; and

another closure means for the enclosing and sealing the protective jacket opening.

10. An armored interconnection as set forth in claim 9 wherein the other closure means is a shrinkable tubing.

11. An armored interconnection as set forth in claim 8 wherein the closure means are portions of a shrinkable tubing.

12. An armored interconnection as set forth in claim 8 wherein the gasket means comprise a plurality of o-rings.

13. An armored interconnection as set forth in claim 8 wherein the inner fiber carrying jacket is Hytrel brand material or equivalent.

14. An armored interconnection as set forth in claim 8 wherein the intermediate armored jacket is a Kevlar brand stranded material or equivalent stranded tubular armored material.

15. An armored interconnection as set forth in claim 8 wherein the outer protective jacket is a polyurethane material or equivalent.

16. An armored interconnection as set forth in claim 8 further comprising:

a pair of wound fiber optic cable portions with the armored interconnection intermediate the wound portions, spaced apart a fixed distance;

the distance between retainer beads on the respective ends of the armored interconnection is approximately 1.8 times the distance between a free length of the fiber optic cable between the wound portions.

17. An armored interconnection as set forth in claim 16 wherein the wound portions of fiber optic cable are bobbins of wound fiber optic cable suitable for use in association with a weapon payout system and the free length of fiber optic cable is measured between the bobbins fixed in place for use in the weapon system.

18. A method of constructing an armored interconnection for joining two free ends of optical fiber extending between two housings having separate bobbins containing wound optical fiber, comprising the steps of:

determining an appropriate length for an armored interconnection extending between said housings and comprising an inner fiber carrying jacket, an outer protective jacket, and an intermediate jacket of a stranded armored material, the appropriate length determined by the distance between a free length of an optic fiber cable;

slitting the outer protective jacket intermediate opposing ends of the length of the armored interconnection;

exposing the inner fiber carrying jacket;

threading gasket members over the ends of the outer protective jacket of the armored interconnection;

threading a plurality of closure members over the ends of the outer protective jacket of the armored interconnection;

threading retaining bead members over the ends of the outer protective jacket of the armored interconnection;

bisecting the inner fiber carrying jacket and the optical fiber pre-disposed therein;

removing the bisected pre-disposed optical fiber from said inner fiber carrying jacket,

inserting the two free ends op optical fibers from the bobbins into the inner fiber carrying jacket until they emerge from the bisected ends of said jacket through the slit in the outer protective jacket;

splicing the opposing ends of the optic fiber extending through said slit;

pulling the spliced fiber back into the armored interconnection;

enclosing the slit in the outer protective jacket with a protective closure;

exposing the ends of the intermediate jacket of armored strands;

folding exposed ends of the intermediate armored jacket towards the opposing ends of the armored interconnection and over the protective outer jacket and respective retaining bead members;

enclosing and sealing the double layer of intermediate armored jacket and outer protective jacket and retaining bead members with proximate closure members of the respective ends of the armored interconnection; and

placing respective gasket members in abutting and sealing relationship with the enclosed end portions of the armored interconnection.