# US 5,347,606 A · Method and an arrangement for splicing optical waveguides

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- Number: US 5,347,606 A
- Document ID: US5347606A
- Status: Granted
- Kind: A
- Application number: 07/996,313
- Filed: 1992-12-23
- Granted: 1994-09-13
- Earliest claimed: 1992-01-13
- Assignees: Televerket
- Inventors: Lars Johansen
- Web page: https://patentgrep.com/patent/US5347606A

## CPC

- G02B 6/3801: {Permanent connections, i.e. wherein fibres are kept aligned by mechanical means (splices by bonding G02B6/255; fusion splices G02B6/2551)}
- G02B 6/3803: {Adjustment or alignment devices for alignment prior to splicing}
- G02B: OPTICAL ELEMENTS, SYSTEMS OR APPARATUS

## Abstract

The invention relates to a method and an arrangement for splicing optical waveguides and, more specifically, for effecting such splicing under field conditions i.e. directly in cable pits where the waveguides requiring splicing are housed. In accordance with the invention, a solidifiable refractive-index matching means is used to effect the splicing. The index-matching means is applied between the ends of the two waveguides in a support arrangement and is then solidified to form a splice having optical, ageing and temperature characteristics substantially corresponding to those of the waveguides. The temperature at which solidification is effected can be such that the refractive index-matching means is sintered to form a glass splice. The index-matching means is preferably a silica gel which can be solidified either chemically or by the application of heat.

## Claims

### Claim 1

An arrangement for splicing optical waveguides comprising a support member for supporting the ends of the waveguides requiring splicing, one surface of the said member having a groove formed therein in which the ends of the waveguides are located, in alignment, in a spaced-apart relationship, a solidifiable refractive index-matching means in the space between the ends of the waveguides, a cover for enclosing the ends of the waveguides and the refractive index-matching means in the groove, means for regaining the cover in position wherein said solidifiable refractive index-matching means adheres to said support member after said refractive index matching means solidified.

### Claim 2 (depends on 1)

An arrangement as claimed in claim 1 wherein the cover is retained in position by adhesion to the refractive index-matching means.

### Claim 3 (depends on 1)

An arrangement as claimed in claim 1 wherein the cross-section of the groove is V-shaped.