Overmolded multi-port optical connection terminal having means for accommodating excess fiber length

• US 20060147172A1
• Filed: 12/30/2004
• Published: 07/06/2006
• Est. Priority Date: 12/30/2004
• Status: Active Grant

• Current Assignee: Corning Optical Communications LLC (Corning Incorporated)
• Original Assignee: Corning Cable Systems LLC (Corning Incorporated)
• Inventors: Luther, James P., Elkins, Robert B. II, Nielsen, Lars K.
• Granted Patent: US 7,302,152 B2
• Time in Patent Office: Days
• US Class Current: 385/135
• CPC Class Codes: G02B 6/4441 Boxes

Abstract

An overmolded multi-port optical connection terminal for a fiber optic distribution cable includes a tether cable containing a plurality of optical fibers optically connected to a corresponding plurality of optical fibers terminated from the fiber optic distribution cable at a first end of the tether cable, an overmolded housing a the second end of the tether cable, at least one connector port, and plenum means for accommodating excess fiber length (EFL) caused by shrinkage of the tether cable and/or pistoning of the optical fibers of the tether cable during connector mating. In one embodiment, a centralized plenum means is defined by an internal cavity within the overmolded housing sufficient for accommodating the EFL without micro bending. In another embodiment, a distributed plenum means is defined by an oversized tubular portion of the tether cable having an inner diameter sufficient for accommodating the EFL without micro bending.

Claims

1. An overmolded optical connection terminal for a fiber optic cable, the terminal comprising;

a tether cable having a first end adapted to be attached to the fiber optic cable and a second end terminating in one or more optical connectors, the tether cable containing a plurality of optical fibers optically connected to a corresponding plurality of optical fibers terminated from the fiber optic cable;

an overmolded housing at the second end of the tether cable and defining at least one connector port for providing access to the one or more optical connectors of the tether cable optically connected to the plurality of optical fibers terminated from the fiber optic cable; and

a plenum defining an air space for accommodating excess fiber length (EFL) of the optical fibers of the tether cable.

2. The terminal of claim 1, wherein the plenum is defined by an internal cavity within the overmolded housing sufficient for accommodating the EFL without micro bending of the optical fibers of the tether cable.

3. The terminal of claim 1, wherein the plenum comprises a base portion, a lid portion, a tether cable opening, an internal cavity and a plurality of optical fiber openings.

4. The terminal of claim 1, wherein the plenum is defined by an oversized tubular portion of the tether cable having an inner diameter sufficient for accommodating the EFL without micro bending of the optical fibers of the tether cable.

5. The terminal of claim 4, wherein the oversized tubular portion of the tether cable has a fill ratio less than about 80%.

6. The terminal of claim 4, wherein the oversized tubular portion of the tether cable has a fill ratio less than about 50%.

7. The terminal of claim 4, wherein the oversized tubular portion of the tether cable has a fill ratio less than about 20%.

8. The terminal of claim 1, further comprising a furcation at the second end of the tether cable for separating the optical fibers of the tether cable into individual optical fibers that are routed to a respective connector port.

9. The terminal of claim 1, wherein the first end of the tether cable is attached to a fiber optic distribution cable at a mid-span access location of the distribution cable.

10. The terminal of claim 9, wherein the tether cable is attached to the fiber optic distribution cable in the factory, the tether cable is lashed to the distribution cable and the overmolded housing is clamped to the distribution cable during transport and deployment.

11. The terminal of claim 1, wherein the at least one connector port comprises a plurality of connector ports arranged in a linear array.

12. The terminal of claim 1, wherein the at least one connector port comprises a plurality of connector ports arranged in multiple rows each comprising multiple connector ports.

13. The terminal of claim 1, wherein the at least one connector port is a receptacle comprising a connector alignment sleeve for aligning and optically connecting at least one of the optical connectors on the second end of the tether to an opposing optical connector of a connectorized fiber optic drop cable.

14. An overmolded multi-port optical connection terminal adapted to be attached to a fiber optic distribution cable at a mid-span access location to interconnect at least one optical fiber terminated from the distribution cable at the mid-span access location to at least one optical fiber of a connectorized fiber optic drop cable, the terminal comprising:

a tether cable containing a plurality of optical fibers and having a first end and a second end;

an overmolded housing at the second end of the tether cable defining a plurality of connector ports, the connector ports receiving at least one optical connector mounted upon the end of at least one of the plurality of optical fibers of the tether cable for mating with an opposing optical connector mounted upon the end of the at least one optical fiber of the connectorized fiber optic drop cable; and

a plenum means for accommodating excess fiber length (EFL) caused by shrinkage of the tether cable and pistoning of the at least one optical fiber of the tether cable when the opposing optical connectors are mated.

15. The multi-port terminal of claim 14, wherein the plenum means is defined by an internal cavity within the overmolded housing sufficient for accommodating the EFL without micro bending of the optical fibers of the tether cable.

16. The multi-port terminal of claim 14, wherein the plenum means is defined by an oversized tubular portion of the tether cable having an inner diameter sufficient for accommodating the EFL without micro bending of the optical fibers of the tether cable.

17. The multi-port terminal of claim 16, wherein the oversized tubular portion of the tether cable has a fill ratio less than about 80%.

18. The multi-port terminal of claim 16, wherein the oversized tubular portion of the tether cable has a fill ratio less than about 50%.

19. The multi-port terminal of claim 16, wherein the oversized tubular portion of the tether cable has a fill ratio less than about 20%.

20. The multi-port terminal of claim 14, wherein the plurality of connector ports are arranged in multiple rows each comprising multiple connector ports.