Connectors for plastic optical fiber

• US 6,325,549 B1
• Filed: 10/20/1999
• Issued: 12/04/2001
• Est. Priority Date: 07/13/1999
• Status: Expired due to Term

• Current Assignee: Fitel USA Corporation (Furukawa Electric Company Limited)
• Original Assignee: Lucent Technologies, Inc. (Nokia Corporation)
• Inventors: Shevchuk, George John
• Primary Examiner(s): SCHUBERG, DARREN E
• Application Number:
  US09/421,737
• Time in Patent Office: 776 Days
• Field of Search: 388/55, 388/76, 388/86, 388/87
• US Class Current: 385/86
• CPC Class Codes: G02B 6/3809 without a ferrule embedding the fibre end, i.e. with bare fibre end
• CPC Class Codes: G02B 6/3858 Clamping, i.e. with only elastic deformation
• CPC Class Codes: G02B 6/3888 Protection from over-extension or over-compression
• CPC Class Codes: G02B 6/3893 Push-pull type, e.g. snap-in, push-on

Abstract

A connector for an optical fiber includes a fiber holder for positionally aligning and retaining the end of the optical fiber and a clamp for selectively clamping the optical fiber against movement in and relative to the connector. The connector is insertable into a coupler for optically coupling the optical fiber with another optical fiber held in the connector or with an optical device.

Claims

1. An optical fiber connector for retaining an end portion of an optical fiber cable having a bare optical fiber covered by an optical fiber jacket, said optical fiber connector being insertable in a coupler for optically interconnecting the retained optical fiber cable to one of another optical fiber cable and an optical waveguide held in another connector inserted in an opposing end of the coupler, said optical fiber connector comprising:

a connector housing having a first end for holding the optical fiber cable end portion and a second end through which the optical fiber cable enters the connector;

a fiber holder disposed in the connector housing and comprising an aligning region for aligning the optical fiber cable end portion at a central region of said connector; and

a fiber clamp on said connector housing for retaining the optical fiber cable in said connector and configured for selective movement between a release position in which the optical fiber cable is insertable into and selectively positionable within the connector housing and a clamping position in which the optical fiber cable is clamped within the connector housing against movement of the optical fiber cable relative to the connector housing.

2. The optical fiber connector claim 1, wherein said fiber clamp comprises first and second parts pivotally arranged on said connector housing for pivotal movement toward and away from each other between said clamping and release positions.

3. The optical fiber connector of claim 2, wherein said first and second parts of said fiber clamp are configured and arranged for clamping the optical fiber between said first and second parts with the fiber clamp in said clamped position.

4. The optical fiber connector of claim 3, wherein said fiber holder comprises a guide piece connected at an inner wall of said connector housing and extending radially inward, said fiber holder defining a through-hole through which the optical fiber cable is insertable.

5. The optical fiber connector of claim 4, wherein said first part of said fiber clamp comprises a projection having an edge configured and arranged to press against the optical fiber jacket and thereby prevent movement of the optical fiber cable with said fiber clamp in said clamping position.

6. The optical fiber connector of claim 1, wherein said fiber clamp comprises a first portion carrying a pair of opposed wall members between which the bare optical fiber is receivable and a second portion pivotally movable relative to said first portion and defining a slot configured and arranged to press together said opposed wall members in said clamping position of the fiber clamp and thereby clamp the bare optical fiber between the opposed wall members.

7. The optical fiber connector of claim 1, wherein said fiber holder comprises a guide piece connected at an inner wall of said connector housing and extending radially inward, said fiber holder defining a through-hole through which the optical fiber cable is insertable.

8. The optical fiber connector of claim 7, wherein said guide piece extending radially inward is also angled relative to an insertion direction of the optical fiber cable.

9. The optical fiber connector of claim 1, wherein said connector housing comprises first and second housing parts, said first part being pivotally connected to said second part along a pivot axis.

10. The optical fiber connector of claim 9, wherein said fiber clamp comprises first and second clamping parts, said first clamping part being mounted on said first housing part and said second clamping part being mounted on said second housing part, said first and second housing parts being movable with said first and second clamping parts between said clamping position and said release position.

11. The optical fiber connector of claim 10, wherein said fiber holder further comprises a longitudinally extending V-groove element and wherein said aligning region comprises a V-groove for receiving the optical fiber cable end portion.

12. The optical fiber connector of claim 11, wherein said V-groove element is configured and arranged for engagement with a corresponding V-groove element of another connector holding an optical fiber cable for optically connecting the optical fiber cables.

13. The optical fiber connector of claim 1, wherein said fiber holder further comprises a longitudinally extending V-groove element and wherein said aligning region comprises a V-groove for receiving the optical fiber cable end portion.

14. The optical fiber connector of claim 13, wherein said V-groove element is configured and arranged for engagement with a corresponding V-groove element of another connector holding another optical fiber cable for optically connecting the two optical fibers.

15. The optical fiber connector of claim 1, wherein said connector housing comprises a first part comprising said fiber holder and a second part comprising said fiber clamp, said first part being fixedly connectable to said second part.

16. The optical fiber connector of claim 15, wherein said first part is connectable to said second part via a frictional connection defined in at least one of said first and second parts.

17. The optical fiber connector of claim 15, wherein said second part comprises a projection and said first part comprises an aperture for receiving the projection for connecting said second part to said first part.

18. The optical fiber connector of claim 1, wherein said fiber holder comprises first and second fiber holders for receiving respective first and second bare optical fibers of a duplex fiber optic cable.

19. The optical fiber connector of claim 18, wherein said first fiber holder defines a first connector housing said second fiber holder defines a second connector housing, and wherein said fiber clamp defines a gripper in said housing for gripping said first and second connector housings.

20. The optical fiber connector of claim 1, wherein said fiber holder and said fiber clamp are configured and arranged such that a resilience of the optical fiber cable inserted in said optical fiber connector between the end portion and said fiber clamp operatively ensures a proper optical connection between the optical fiber cable and one of another optical fiber cable and an optical waveguide held in the socket and another connector.

21. The optical fiber connector of claim 1, in combination with said coupler in which said optical fiber connector is insertable, wherein said coupler comprises a sleeve for receiving an end of the optical fiber cable retained in said optical fiber connector and one of another optical fiber cable and an optical waveguide held in another connector inserted in an opposing end of said coupler, said sleeve having a central portion with a first diameter and two outer portions surrounding said central portion with second diameters, said first diameter being smaller than said second diameter.

22. The combination of claim 21, wherein said second diameter is sized for receiving the optical fiber jacket of said optical fiber cable and said first diameter is sized for receiving the bare optical fiber of said optical fiber cable.

23. The combination of claim 21, wherein said sleeve further comprises a tapered section arranged between each one of said outer portions and said central portion of said sleeve.