High performance, flexible optical fiber furcation

• US 6,771,861 B2
• Filed: 05/07/2002
• Issued: 08/03/2004
• Est. Priority Date: 05/07/2002
• Status: Active Grant

• Current Assignee: Corning Optical Communications LLC (Corning Incorporated)
• Original Assignee: Corning Cable Systems LLC (Corning Incorporated)
• Inventors: James, Kenneth T., Wagner, Karl M.
• Primary Examiner(s): NGUYEN, KHIEM M
• Application Number:
  US10/140,642
• Publication Number:
  US 20030210875A1
• Time in Patent Office: 819 Days
• Field of Search: 385/100-114
• US Class Current: 385/100
• CPC Class Codes: G02B 6/4472 Manifolds
• CPC Class Codes: G02B 6/4476 with heat-shrinkable elements

Abstract

This invention provides an apparatus and method for a high performance, flexible optical fiber furcation assembly that minimizes bending in the optical fibers throughout the life of the furcation assembly. The furcation assembly includes a flexible furcation body having a passageway with a first end and an opposed second end, the first end for receiving a fiber optic cable and the second end for routing a furcated leg, and holding material for flexibly securing and supporting the fiber optic cable and the furcated leg substantially within the single passageway. A method is provided for applying the furcation assembly to an optical cable. The apparatus and method of this invention apply to a variety of optical cable types.

Claims

1. A furcation assembly comprising:

a flexible furcation body having a first end and an opposed second end with a single passageway extending therebetween, the first end for receiving a portion of a fiber optic cable and the second end for routing at least one furcated leg of the fiber optic cable out of the furcation assembly; and

holding means for flexibly holding and supporting the portion of the fiber optic cable and the at least one furcated leg substantially within the single passageway, such that the holding means minimizes bending of the portion of the fiber optic cable and the at least one furcated leg.

2. The furcation assembly of claim 1, further comprising:

at least one buffer tube for covering at least a portion of the at least one furcated leg, the at least one buffer tube having a first end and a second end, wherein the first end is located substantially within the flexible furcation body and wherein the second end is located substantially outside the flexible furcation body.

3. The furcation assembly of claim 2, wherein the buffer tube has a diameter of about 900 microns.

4. The furcation assembly of claim 2, wherein the at least one furcated leg has a diameter of about 250 microns.

5. The furcation assembly of claim 1, wherein the flexible furcation body comprises a lengthwise extending breathable tube.

6. The furcation assembly of claim 1, wherein the holding means comprises an adhesive for holding the portion of the fiber optic cable and the at least one furcated leg substantially within the single passageway.

7. The furcation assembly of claim 6, wherein the adhesive comprises silicone.

8. The furcation assembly of claim 1, further comprising:

sealing means for substantially sealing the holding means within the single passageway.

9. The furcation assembly of claim 8, wherein the sealing means comprises:

a first furcation end component sealingly engaging the first end of the flexible furcation body; and

a second furcation end component sealing engaging the second end of the flexible furcation body.

10. A furcation assembly comprising:

a flexible furcation body having a single passageway with a first end and an opposed second end, the first end for receiving a portion of a fiber optic cable and the second end for routing a portion of at least one furcated leg of the fiber optic cable out of the furcation assembly; and

holding means for flexibly holding and supporting the portion of the fiber optic cable and the at least one furcated leg within the single passageway.

11. A method of applying a furcation assembly to a fiber optic cable, comprising:

preparing the fiber optic cable to be furcated;

sliding a flexible furcation body over a first end of the fiber optic cable, the flexible furcation body having a first end and an opposed second end with a single passageway therebetween; and

introducing a holding means into the furcation body, wherein the holding means flexible holds and supports a portion of the fiber optic cable and at least one furcated leg of the fiber optic cable substantially within the single passageway.

12. The method of claim 11, wherein preparing the fiber optic cable includes stripping a portion of the fiber optic cable to expose at least one optical fiber.

13. The method of claim 11, wherein preparing the fiber optic cable includes fanning out at least one optical fiber from the fiber optic cable.

14. The method of claim 13, wherein preparing the fiber optic cable includes placing a fan-out buffer tube on the at least one optical fiber.

15. The method of claim 11, further comprising introducing a sealing means on at least one predetermined portion of the flexible furcation assembly wherein introducing a sealing means comprises:

overmolding a thermoplastic resin on at least one predetermined end of the flexible furcation assembly.

16. The method of claim 11, further comprising:

securingly attaching an end component at one end of the flexible furcation assembly.

17. A method of routing a fiber optic cable in a furcation assembly, comprising the steps of:

inserting a portion of a first end of the fiber optic cable into a flexible furcation body, the flexible furcation body having a first end and an opposed second end with a single passageway therebetween;

exposing at least one optical fiber at the first end of the fiber optic cable;

sliding the flexible furcation body over at least a portion of the at least one optical fiber and a portion of the first end of the fiber optic cable; and

introducing a holding means into the flexible furcation body, wherein the holding means flexibly secures and supports at least a portion of the at least one optical fiber and a portion of the first end of the fiber optic cable substantially within the single passageway.