Fiber optic local convergence points for multiple dwelling units

• US 7,349,616 B1
• Filed: 01/12/2007
• Issued: 03/25/2008
• Est. Priority Date: 01/12/2007
• Status: Active Grant

• Current Assignee: Corning Optical Communications LLC (Corning Incorporated)
• Original Assignee: Corning Cable Systems LLC (Corning Incorporated)
• Inventors: Castonguay, Guy, Cox, Terry Dean, Liggett, Thomas Shaw, Strickland, Selena
• Primary Examiner(s): Healy; Brian
• Application Number:
  US11/653,137
• Time in Patent Office: 438 Days
• Field of Search: 385/24, 385/134, 385/135, 385/136, 385/137, 385/99, 385/96, 385/100, 385/88, 385/89, 385/92, 385/94, 385/123, 385/124, 385/125, 385/126, 385/127, 398/66, 398/67, 398/70, 398/71, 398/73, 398/165
• US Class Current: 385/135
• CPC Class Codes: G02B 6/445 with lateral pivoting cover
• CPC Class Codes: G02B 6/4452 Distribution frames
• CPC Class Codes: G02B 6/44524 with frame parts or auxiliary devices mounted on the frame and collectively not covering a whole width of the frame or rack cassettes G02B6/4453
• CPC Class Codes: G02B 6/44528 Patch-cords; Connector arrangements in the system or in the box routing arrangements H04Q1/00
• CPC Class Codes: G02B 6/4454 with splices
• CPC Class Codes: G02B 6/4471 Terminating devices demountable connectors G02B6/3807; Cable clamps

Abstract

There are provided fiber optic local convergence points (“LCPs”) adapted for use with multiple dwelling units (“MDUs”) that facilitate relatively easy installation and/or optical connectivity to a relatively large number of subscribers. The LCP includes a housing mounted to a surface, such as a wall, and a cable assembly with a connector end to be optically connected to a distribution cable and a splitter end to be located within the housing. The splitter end includes at least one splitter and a plurality of subscriber receptacles to which subscriber cables may be optically connected. The splitter end of the cable assembly of the LCP may also include a splice tray assembly and/or a fiber optic routing guide. Furthermore, a fiber distribution terminal (“FDT”) may be provided along the subscriber cable to facilitate installation of the fiber optic network within the MDU.

Claims

1. A fiber optic local convergence point (“

LCP”

) adapted for use with a multiple dwelling unit, wherein the LCP is adapted to optically connect at least one optical fiber of a distribution cable to at least one subscriber optical fiber, the LCP comprising;

a housing comprising an interior cavity defined by a plurality of sides and by a cover that is selectively moveable from an opened position to a closed position to thereby provide access to the interior cavity when the cover is in the opened position, wherein the housing comprises at least one surface adapted for mounting the LCP to a structure and the housing further comprises at least one opening through the housing for the passage of at least one optical fiber; and

a cable assembly comprising;

a connector end adapted for optical connection to the at least one optical fiber of the distribution cable; and

a splitter end generally opposite the connector end of the cable assembly and defining a casing, wherein an exterior surface of the casing defines a plurality of receptacles adapted to selectively receive fiber optic connectors that are optically connected to the at least one subscriber optical fiber;

wherein the connector end is optically connected to the splitter end with at least one cable assembly optical fiber;

wherein the splitter end comprises at least one splitter that optically connects the at least one cable assembly optical fiber with the plurality of receptacles;

wherein the splitter end of the cable assembly is adapted to be removably received within the housing of the LCP and wherein the splitter end is adapted to be received within the housing without opening the casing of the splitter end.

2. An LCP according to claim 1, wherein the splitter end of the cable assembly comprises at least one of a splice tray assembly and a fiber optic routing guide.

3. An LCP according to claim 1, wherein the splitter end of the cable assembly is adapted to be removably received within the housing of the LCP without requiring at least one of a splicing operation and a connectorization operation.

4. An LCP according to claim 1, wherein the splitter end of the cable assembly is adapted to be removably received within the housing of the LCP without the use of at least one fastener.

5. An LCP according to claim 1, wherein the splitter end of the cable assembly is adapted to rotatably received within the housing of the LCP.

6. An LCP according to claim 1, wherein at least one of the optical fibers of the cable assembly comprises a microstructured optical fiber comprising a core region and a cladding region surrounding the core region, the cladding region comprising an annular hole-containing region comprised of non-periodically disposed holes.

7. An LCP according to claim 6, wherein the microstructured fiber has an 8 mm macrobend induced loss at 1550 nm of less than 0.2 dB/turn.

8. An LCP according to claim 1, wherein the LCP defines a density of receptacles per unit of volume of the housing of at least 1 receptacles/in³.

9. An LCP according to claim 8, wherein the LCP defines a density of receptacles per unit of volume of the housing from about 2 receptacles/in³ to about 4 receptacles/in³.

10. A cable assembly adapted for use in a multiple dwelling unit, wherein the cable assembly is adapted to optically connect at least one optical fiber of a distribution cable to at least one subscriber optical fiber, the cable assembly comprising:

a connector end adapted for optical connection to the at least one optical fiber of the distribution cable; and

a splitter end generally opposite the connector end of the cable assembly and defining a casing, wherein an exterior surface of the casing defines a plurality of receptacles adapted to selectively receive fiber optic connectors that are optically connected to the at least one subscriber optical fiber;

wherein the connector end is optically connected to the splitter end with at least one cable assembly optical fiber;

wherein the splitter end comprises at least one splitter that optically connects the at least one cable assembly optical fiber with the plurality of receptacles.

11. A cable assembly according to claim 10, wherein the splitter end of the cable assembly is adapted to be removably received within a housing of a fiber optic local convergence point.

12. A cable assembly according to claim 10, wherein the splitter end comprises a plurality of splitters that optically connect a plurality of cable assembly optical fibers with the plurality of receptacles.

13. A cable assembly according to claim 10, wherein the splitter end defines at least 80 receptacles on the exterior surface of the casing.

14. A cable assembly according to claim 10, wherein the plurality of receptacles on the exterior surface of the casing comprise at least one of a simplex receptacle, a duplex receptacle, and a multiple fiber receptacle.

15. A cable assembly according to claim 10, wherein at least one of the optical fibers of the cable assembly comprises a microstructured optical fiber comprising a core region and a cladding region surrounding the core region, the cladding region comprising an annular hole-containing region comprised of non-periodically disposed holes.

16. A cable assembly according to claim 15, wherein the microstructured fiber has an 8 mm macrobend induced loss at 1550 nm of less than 0.2 dB/turn.

17. A cable assembly according to claim 10, wherein the splitter end of the cable assembly comprises at least one of a splice tray assembly and a fiber optic routing guide.

18. A fiber optic splice tray assembly adapted for use in an enclosure of a fiber optic network, the splice tray assembly comprising:

a frame defining a base and a plurality of sidewalls joined to the base, wherein a volume of the splice tray assembly is defined by a length of the base, a width of the base, and a height of the sidewalls;

a splice tray comprising a plurality of splice holders joined to the splice tray, wherein the splice holders are adapted to selectively receive a plurality of splices of optical fibers; and

at least a portion of the sidewalls define slack storage generally around the splice tray, wherein the slack storage provides for a sufficient amount of slack of the optical fibers associated with the splice generally sufficient for a technician to optically connect the optical fibers with the splice;

wherein the splice tray assembly defines a density of splice holders per unit of volume of the splice tray assembly of at least one of at least 5 single splices/in³ and at least 10 mass fusion splices/in³.

19. A splice tray assembly according to claim 18, wherein the splice tray assembly defines a density of splice holders per unit of volume of the splice tray assembly of at least one of from about 6 single splices/in³ to about 8 single splices/in³ and from about 12 mass fusion splices/in³ to about 16 mass fusion splices/in³.

20. A splice tray assembly according to claim 18, wherein the splice holders are generally angled relative to the sidewalls of the frame.

21. A splice tray assembly according to claim 18, wherein slack storage is provided along no more than three sidewalls of the frame.

22. A splice tray assembly according to claim 18, wherein at least one of the optical fibers associated with a splice comprises a microstructured optical fiber comprising a core region and a cladding region surrounding the core region, the cladding region comprising an annular hole-containing region comprised of non-periodically disposed holes.

23. A splice tray assembly according to claim 22, wherein the microstructured fiber has an 8 mm macrobend induced loss at 1550 nm of less than 0.2 dB/turn.

24. A fiber optic splitter module for optically connecting at least one input optical fiber and a plurality of output optical fibers, the splitter module comprising:

a housing having at least one opening therethrough, wherein the opening defines an opening axis generally orthogonal to the opening; and

a splitter within the housing, wherein the input optical fiber is optically connected to the plurality of output optical fibers by the splitter, wherein the splitter defines a splitter axis generally aligned with the input optical fiber and the plurality of output optical fibers;

wherein the splitter axis is generally orthogonal to the opening axis,

wherein the splitter module defines a density of output optical fiber splits per unit of volume of the housing of at least 5 splits/in³.

25. A splitter module according to claim 24, wherein the splitter module defines a density of output optical fiber splits per unit of volume of the housing from about 4 splits/in³ to about 10 splits/in³.

26. A fiber optic splitter module for optically connecting at least one input optical fiber and a plurality of output optical fibers, the splitter module comprising:

a housing having at least one opening therethrough, wherein the opening defines an opening axis generally orthogonal to the opening; and

a splitter within the housing, wherein the input optical fiber is optically connected to the plurality of output optical fibers by the splitter, wherein the splitter defines a splitter axis generally aligned with the input optical fiber and the plurality of output optical fibers;

wherein the splitter axis is generally orthogonal to the opening axis,

wherein at least one of optical fiber of the plurality of output optical fibers comprises a microstructured optical fiber comprising a core region and a cladding region surrounding the core region, the cladding region comprising an annular hole-containing region comprised of non-periodically disposed holes.

27. A splitter module according to claim 26, wherein the microstructured fiber has an 8 mm macrobend induced loss at 1550 nm of less than 0.2 dB/turn.

28. A fiber optic routing guide adapted for use in an enclosure of a fiber optic network, wherein the routing guide is adapted to store slack of the optical fiber, the routing guide comprising:

a housing defining an outer surface generally located between a top surface and a bottom surface;

a core portion defining a fiber routing surface along the perimeter of the core portion between the top surface and the bottom surface, wherein the core portion is generally centered in the housing and wherein the fiber routing surface is adapted to receive the routed optical fiber;

an outer wall joined to the core portion, wherein the outer wall defines the outer surface of the housing and defines an inner surface opposite the outer surface and facing the fiber routing surface of the core portion; and

at least one tab portion extending radially from at least one of the fiber routing surface and the inner surface;

wherein a volume of the routing guide is defined along the outer surface between the top surface and bottom surface;

wherein the routing guide is adapted to store an amount of length of optical fiber per unit of volume of the housing of at least 10 inches of 900 μ

m diameter optical fiber/in³.

29. A routing guide according to claim 28, the routing guide is adapted to store an amount of length of optical fiber per unit of volume of the housing of at least 12 inches of 900 μ

m diameter optical fiber/in³.

30. A routing guide according to claim 28, wherein the inner surface generally defines a plurality of curved surfaces having a common center and the outer surface generally defines a plurality of curved surfaces having a common center.

31. A routing guide according to claim 28, wherein the routed optical fiber comprises a microstructured optical fiber comprising a core region and a cladding region surrounding the core region, the cladding region comprising an annular hole-containing region comprised of non-periodically disposed holes.

32. A routing guide according to claim 31, wherein the microstructured fiber has an 8 mm macrobend induced loss at 1550 nm of less than 0.2 dB/turn.

33. A fiber distribution terminal (“

FDT”

) adapted for use in a fiber optic network of a multiple dwelling unit, the FDT comprising;

a housing defining a top wall, a bottom wall, and at least one sidewall extending between the top wall and bottom wall, wherein a volume of the housing is defined along the sidewall between the top wall and bottom wall;

an input opening defined in the at least one sidewall and adapted to receive at least one input optical fiber; and

an output opening defined in the at least one sidewall and comprising a plurality of fiber optic output receptacles adapted to receive fiber optic connectors to optically connect the fiber optic connector to a respective one of the at least one input optical fiber;

wherein the FDT defines a density of fiber optic output receptacles per unit of volume of the housing of at least 6 receptacles/in³.

34. An FDT according to claim 33, wherein the FDT defines a density of fiber optic output receptacles per unit of volume of the housing from about 5 receptacles/in³ to about 20 receptacles/in³.

35. An FDT according to claim 33, wherein the fiber optic output receptacles define a center-to-center distance of 5 mm.

36. An FDT according to claim 33, wherein the sidewall comprises four sides generally defining a rectangular shape.

37. An FDT according to claim 33, wherein the input opening defines an input axis generally orthogonal to the input opening, wherein the output opening defines an output axis generally orthogonal to the output opening, and wherein the input axis and the output axis are generally orthogonal to one another.

38. An FDT according to claim 33, wherein the number of input optical fibers is equivalent to the number of fiber optic output receptacles.

39. An FDT according to claim 33, wherein the housing further comprises a removable portion adapted to selectively cover the fiber optic output receptacles when at least one connector is received in the fiber optic output receptacles to generally protect the at least one connector from unintentional disconnection.

40. An FDT according to claim 33, wherein the FDT is adapted to receive at least one optical fiber comprising a microstructured optical fiber comprising a core region and a cladding region surrounding the core region, the cladding region comprising an annular hole-containing region comprised of non-periodically disposed holes.

41. An FDT according to claim 40, wherein the microstructured fiber has an 8 mm macrobend induced loss at 1550 nm of less than 0.2 dB/turn.