Optic fiber contact

• US 4,798,431 A
• Filed: 12/07/1987
• Issued: 01/17/1989
• Est. Priority Date: 12/04/1986
• Status: Expired due to Fees

• Current Assignee: ITT Corporation (ITT, Inc.)
• Original Assignee: ITT Corporation (ITT, Inc.)
• Inventors: Clark, Kenneth M., Coutts, Bruce, Borsuk, Leslie M.
• Primary Examiner(s): Sikes, William L.
• Assistant Examiner(s): Wise, Robert E.
• Application Number:
  US07/129,797
• Time in Patent Office: 407 Days
• Field of Search: 350/96.18, 350/96.20, 350/96.21
• US Class Current: 385/74
• CPC Class Codes: G02B 6/2552 reshaping or reforming of light guides for coupling using thermal heating, e.g. tapering, forming of a lens on light guide ends
• CPC Class Codes: G02B 6/262 Optical details of coupling light into, or out of, or between fibre ends, e.g. special fibre end shapes or associated optical elements
• CPC Class Codes: G02B 6/32 having lens focusing means positioned between opposed fibre ends with lens being an integral part of the single fibre end G02B6/262

Abstract

An optic fiber connection system is provided which enables the forming of a lens or bead at the end of an optic fiber by an electric arc established between a pair of electrodes, which avoids degradation of the electrodes with use. The contact has a forward portion with a hole along its axis for receiving the optic fiber, and a cross aperture extending perpendicular to the hole to receive the end of the optic fiber. The forward portion of the contact is formed of a ceramic or other high melting temperature dielectric, to allow the electrodes to be widely spaced to avoid their degradation, without shorting out the electric arc.

Claims

1. Optic fiber connection apparatus comprising:

a contact having forward and rearward end portions, opposite sides, and an axis, and having a hole extending along said axis for receiving an optical fiber which has a front end, said contact forward end portion having a cross-aperture which extends substantially perpendicular to said axis and which intersects said hole to receive a lens lying at the front end of an optic fiber which extends through said hole, said contact forward end portion including a front end for coupling to an external optical device;

said cross-aperture extending through said contact between its opposite sides to pass an electric arc that can melt the end of an optic fiber to form a lens;

said contact forward end portion being formed of a dielectric material having a melting temperature above 1600°

C., to allow an arc to pass through most of the length of the cross-aperture without shorting out the arc or melting the contact.

2. The apparatus described in claim 1 including:

a pair of electrodes lying on opposite sides of said axis and on an imaginary line which extends substantially along said cross-aperture, and means connected to said electrodes for applying a voltage between them that establishes an arc between them, said electrodes having tips spaced apart by most of the length of said cross-aperture.

3. The apparatus described in claim 1 wherein:

said contact includes a ferrule with a front end and a bushing mounted on said ferrule front end, said bushing formed of said dielectric material and forming said hole extending along said axis, said ferrule having an aperture extending along said axis, said hole in said bushing being smaller than said aperture.

4. The apparatus described in claim 1 wherein:

said dielectric material is a ceramic having a melting temperature of over 2200°

C.

5. In an optic fiber connection system wherein an optic fiber extends through a hole at the axis of a contact into a cross-aperture at the front of the contact, and the optic fiber has a forward end that forms a lens of greater diameter than the rest of the fiber and that lies in the cross-aperture, the improvement wherein:

said contact includes a ferrule with a hole along said axis and with a forward end, and also includes a bushing mounted on the forward end of said ferrule, said bushing having a hole along said axis which is of smaller diameter than the hole in said ferrule and which closely surrounds said fiber, said bushing forming said cross-aperture, said bushing being formed of a dielectric material which has a melting temperature greater than the melting temperature of said optic fiber.

6. The improvement described in claim 5 wherein:

said dielectric material is a ceramic material which softens and melts at a temperature above 2200°

C.

7. Optic fiber connection apparatus for holding an optic fiber having a front end forming a lens of greater diameter than the rest of the optic fiber, comprising:

a contact having forward and rearward end portions, opposite sides, and an axis, and having a hole extending along said axis with said optic fiber front end lying in said hole, said contact forward end portion having a cross-aperture which extends substantially perpendicular to said axis and which intersects said hole, said lens of said optic fiber lying in said cross-aperture;

said cross-aperture extending through said contact between its opposite sides to pass an electric arc for initially melting a most forward end of the optic fiber into said lens;

said contact forward end portion being formed of a dielectric material having a melting temperature greater than the melting temperature of said optic fiber, and the width of said contact along said cross-aperture being greater than eight times the diameter of said optic fiber.

8. The apparatus described in claim 7 wherein:

the melting temperature of said dielectric material is above 1600°

C., the diameter of said fiber is about 5 cross-aperture is more than 40 thousandths inch.