Modular optical fiber cassettes and fiber management methods

• US 20090097813A1
• Filed: 09/30/2008
• Published: 04/16/2009
• Est. Priority Date: 10/01/2007
• Status: Active Grant

• Current Assignee: Clearfield, Inc
• Original Assignee: Clearfield, Inc
• Inventors: Hill, John Paul
• Granted Patent: US 7,751,674 B2
• Time in Patent Office: Days
• US Class Current: 385/135
• CPC Class Codes: G02B 6/4454 with splices

Abstract

The present invention provides modular cassettes for fiber management applications. Cassettes in accordance with the present invention comprise plural functional components that nest into a main housing portion to support various application and fiber types. In accordance with the present invention, such components can be added or removed depending on the application and configuration needs of the use environment. Advantageously, cassettes in accordance with the present invention incorporate resilient connections and nested internal components for easy assembly and disassembly with minimal tools.

Claims

1. A modular optical fiber management cassette comprising:

a housing comprising a surface that provides a first level of fiber management and at least one opening that allows entry of an optical fiber cable into the housing;

an adaptor plate resiliently connected to the housing and comprising a plurality of optical fiber connectors;

a radius limiter nested with and resiliently connected to the housing, the radius limiter comprising a base portion and central hub;

a splice tray nested with and resiliently connected to the housing, the splice tray comprising a plurality of splice channels and at least one fiber nest that provides storage of coiled optical fiber, the splice tray comprising a surface that provides a second level of fiber management spaced from the first level of fiber management; and

a housing cover resiliently connected to the housing.

2. The cassette of claim 1, wherein the housing comprises substantially clear plastic.

3. The cassette of claim 1, wherein the housing comprises a mounting region for attaching an optical component to the housing.

4. The cassette of claim 1, wherein the radius limiter comprises substantially opaque plastic.

5. The cassette of claim 4, wherein the radius limiter comprises blue plastic.

6. The cassette of claim 1, wherein the central hub of the radius limiter has a radius greater than a critical bend radius of optical fiber to be managed by the cassette.

7. The cassette of claim 1, wherein the base portion of the radius limiter comprises arcuate sides.

8. The cassette of claim 1, wherein the splice tray comprises substantially opaque plastic.

9. The cassette of claim 8, wherein the splice tray comprises black plastic.

10. The cassette of claim 1, wherein the splice tray comprises a raceway that guides optical fiber cable between the first level of fiber management and the second level of fiber management.

11. The cassette of claim 1, further comprising a splice tray cover distinct from the housing cover.

12. The cassette of claim 1, wherein the housing cover comprises substantially clear plastic.

13. The cassette of claim 1, in combination with optical fiber.

19. A method of optical fiber management comprising:

providing the modular optical fiber management cassette recited in claim 1;

configuring the modular optical fiber management cassette for one of patch-only, patch and splice, and optical component use;

connecting a feed cable to the optical fiber management cassette; and

distributing the feed cable with the adaptor plate.

20. The method of claim 19, comprising testing an optical fiber within the cassette by providing a signal to the optical fiber and optically viewing the optical fiber without removing the housing cover from the housing.

14. A modular optical fiber management cassette comprising:

a clear plastic housing comprising a surface that provides a first level of fiber management and at least one opening that allows entry of an optical fiber cable into the housing;

an adaptor plate resiliently connected to the housing and comprising a plurality of optical fiber connectors;

a radius limiter nested with and resiliently connected to the housing, the radius limiter comprising a base portion and central hub; and

a clear plastic housing cover resiliently connected to the housing.

15. The cassette of claim 14, further comprising a splice tray nested with and resiliently connected to the housing, the splice tray comprising a plurality of splice channels and at least one fiber nest that provides storage of coiled optical fiber, the splice tray comprising a surface that provides a second level of fiber management spaced from the first level of fiber management.

16. The cassette of claim 15, wherein the splice tray comprises first and second spaced apart fiber nests that provide storage of coiled optical fiber.

17. The cassette of claim 14, wherein the housing, adapter plate, radius limiter, and housing cover can be assembled and disassembled without the use of separate fasteners.

18. A modular optical fiber management cassette comprising:

a clear plastic housing comprising at least one opening that allows entry of an optical fiber cable into the housing and a plurality of mounting regions for attaching an optical component to the housing;

an adaptor plate resiliently connected to the housing and comprising a plurality of optical fiber connectors;

an optical component attached to the plurality of mounting regions; and

a clear plastic housing cover resiliently connected to the housing.