Sub-surface fiber optic splice housing and method of splicing fiber optic cable

• US 5,825,963 A
• Filed: 05/09/1997
• Issued: 10/20/1998
• Est. Priority Date: 09/01/1995
• Status: Expired due to Term

• Current Assignee: Lucent Technologies, Inc. (Nokia Corporation)
• Original Assignee: Lucent Technologies, Inc. (Nokia Corporation)
• Inventors: Burgett, Mark Edward
• Primary Examiner(s): Lee, John D.
• Assistant Examiner(s): KIM, ELLEN E
• Application Number:
  US08/853,543
• Time in Patent Office: 529 Days
• Field of Search: 385/134, 385/135, 385/138, 385/139, 385/49, 385/100, 385/56, 385/101
• US Class Current: 385/135
• CPC Class Codes: G02B 6/4446 Cable boxes, e.g. splicing boxes with two or more multi fibre cables
• CPC Class Codes: G02B 6/44465 Seals
• CPC Class Codes: G02B 6/4447 with divided shells G02B6/4448 takes precedence
• CPC Class Codes: G02B 6/501 underground installation of connection boxes
• CPC Class Codes: H02G 15/14 specially adapted for submarine cables

Abstract

A splice housing assembly for joining together at least two fiber optic cables. The splice housing assembly has a housing adapted to create a water impervious seal around both a splicing chamber and at least two fiber optic cables that lead into the splicing chamber through the housing. Within the splicing chamber, the various fiber optic cables are joined together via a grounding block or by a direct optical splice. The housing provides structural integrity, electrical insulation and water tightness to the splice, yet the housing can be selectively opened and closed. As a result, any splice can be made and tested, then repaired or adjusted before the housing is permanently sealed with an encapsulation compound.

Claims

1. A splice housing device for connecting at least one first fiber optic element to a second fiber optic element, wherein each said first fiber optic element is surrounded by a casing that includes a conductive sheathing, said device comprising:

a housing having a first end and an opposite second end, wherein said housing includes a first section and a second section that join together along a common seam;

an optical coupling chamber defined within said housing between said first end and said second end;

a first sheathing coupling chamber defined within said housing between said optical coupling chamber and said first end;

at least one first conduit defined within said housing, wherein each said first conduit extends from said first end to said optical coupling chamber through said first sheathing coupling chamber and one said first fiber optic element passes through each said first conduit and extends into said optical coupling chamber;

a second conduit defined within said housing, wherein said second conduit extends from said second end to said optical coupling chamber and said second optic element passes through said second conduit and extends into said optical coupling chamber;

an optical coupler contained within said internal chamber for optically coupling each said first fiber optic element to said second fiber optic element; and

a conductive element extending within said housing from said first sheathing coupling chamber to a connection point proximate said second end of said housing;

an electrical coupler for coupling the conductive sheathing surrounding each said first fiber optic element to said conductive element within said sheathing coupling chamber; and

an electrical connector extending through said housing to a point external of said housing, said electrical connector being electrically coupled to said conductive element at said connection point, thereby completing an electrical pathway from the conductive sheathing surrounding each said first fiber optic element to said point external of said housing.

2. The device according to claim 1, further including threaded fittings for threadably coupling each said first fiber optic element and said second fiber optic element to said splicing tray.

3. The device according to claim 1, wherein said optical coupling chamber and said first sheathing coupling chamber are separate and distinct within said housing.

4. A method of splicing together at least two fiber optic cables of the type having a fiber optic element surrounded by a metallic sheathing within a casing, said method comprising the steps of:

providing a water impermeable housing that defines a coupling chamber;

providing a splicing tray structure containing a hollow central region;

mechanically joining said fiber optic cables to said splicing tray structure;

splicing together each said fiber optic element within said hollow central region of said splicing tray structure;

exposing a portion of said metal sheathing on each of said fiber optic cables;

electroplating said portion of said metal sheathing;

coupling a connector to said portion of said metal sheathing; and

connecting each said connector with a conductive lead.

5. The method according to claim 4, further including the step of connecting said conductive lead to a connector that extends through said housing to a point on the exterior of said housing.

6. The method according to claim 4, further including the step of filling said housing with an encapsulation compound.

7. The method according to claim 4 further including the steps of:

sealing said hollow central region of said splicing tray structure; and

sealing said splicing tray structure in said coupling chamber of said housing, wherein said housing creates a water impervious enclosure around said splicing tray structure.

8. A splice housing comprising:

a solid housing having a first end and a second end, wherein said housing is divided between a first section and a second section that join together along a common seam;

a first set of reliefs disposed in said first section and said second section of said housing that define a splice chamber when said first section and said second section are joined;

a second set of reliefs disposed in said first section and said second section of said housing between said first end of said housing and said splice chamber, said second set of reliefs defining a first coupling chamber when said first section and said second section are joined;

a third set of reliefs disposed in said first section and said second section of said housing between said second end of said housing and said splice chamber, said third set of reliefs defining a second chamber when said first section and said second section are joined;

a groove disposed in said housing extending between said first coupling chamber and said second coupling chamber, wherein said groove does not intersect said splicing chamber;

a first cable conduit extending from said first end of said housing to said splice chamber through said first coupling chamber; and

a second cable conduit extending from said second end of said housing to said splice chamber through said second coupling chamber.

9. The assembly according to claim 8 further including fill ports disposed in said housing wherein at least one fill port communicates with said splice chamber, said first coupling chamber and said second coupling chamber.