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Fiber optic alignment sleeve
| Details |
Inventors: McCartney, Ronald L.;
Assignee: International Telephone and Telegraph Corporation (New York, NY)
Primary Examiner: Willis; Davis L.
Assistant Examiner:
Attorney, Agent or Firm: Peterson; T. L.
A fiber optic connector for providing a removable light signal transfer connection between the ends of at least one pair of fiber optic cables. The fiber optic cable consists of a jacket and at least one, and usually a plurality of glass fiber conducting elements within said jacket. The fiber optic cable ends to be connected are each encased within an elongated hollow terminating pin. The optical fibers are constrained within the terminating pin into a compact shape having the cross-sectional outline of a hexagon or other polygon. The guide sleeve is provided which includes axial grooves which engage the corners of the polygon face at the terminal end of the terminating pin to effect twist mode or rotational alignment. The guide sleeve is of small cross-section in the vicinity of the point of abutment of the opposing fiber bundles but flares toward the insertion ends. |
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DETAILED DESCRIPTION The present invention may be said to have had the object of providing an alignment sleeve for use in fiber optic connectors which will simply, inexpensively and effectively provide lateral and rotational alignment of abutting fiber optic bundles in a light signal transmissive arrangement.
The invention is substantially independent of whatever axial retention means are provided and also can be adapted to any particular cross-sectional fiber bundle shape at the abutting or interface point.
According to the invention, an axially grooved thin wall sleeve preferably of spring metal, is located so as to bridge over between and within the two socket portions of mating connector shells.
The connector shells and sockets may be not unlike those well known in the electrical connector art, and may provide for the accommodation of only one fiber optic cable connecting pair or for a relatively large number of such connections accomplished in parallel within the same connector shell and socket arrangement.
The alignment sleeve, in accordance with the present invention, can accommodate fiber bundle terminal end configurations of circular cross-section, or of polygon cross-section.
It is particularly adapted to the hexagonal configuration, this being a particularly efficient shape for achieving optimum packing of the individual fibers.
That is, it is known that in the hexagonal terminal end configuration, the ratio of the terminal end area of the glass fibers to the ratio of the voids therebetween, is relatively high.
The axial sleeve, according to the invention, overlaps the said optical fiber interface or abutment point and extends for a distance in both directions therefrom.
A certain amount of flaring to an increased diameter on either side of the said abutment point accommodates the insertion of the termination pins on the ends of the abutting fiber bundles, however, a relatively constant diameter section extending on either side of the said point of abutment is desirable.
The axial grooves or slots through the thin wall of the sleeve perform two functions
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