Fiber optic connector

• US 4,405,201 A
• Filed: 05/13/1981
• Issued: 09/20/1983
• Est. Priority Date: 05/13/1981
• Status: Expired due to Term

• Current Assignee: International Business Machines Corporation
• Original Assignee: International Business Machines Corporation
• Inventors: Evans, Robert T., Cefarelli, Frank P.
• Primary Examiner(s): Lee, John D.
• Application Number:
  US06/263,237
• Time in Patent Office: 860 Days
• Field of Search: 350/96.20, 350/96.21, 350/96.22
• US Class Current: 385/59
• CPC Class Codes: G02B 6/383 Hermaphroditic connectors, i.e. two identical plugs mating with one another, each plug having both male and female diametrically opposed engaging parts; electric hermaphroditic coupling H01R24/84, H01R13/28
• CPC Class Codes: G02B 6/3869 Mounting ferrules to connector body, i.e. plugs
• CPC Class Codes: G02B 6/3885 Multicore or multichannel optical connectors, i.e. one single ferrule containing more than one fibre, e.g. ribbon type optical ribbon cable G02B6/4403, G02B6/448
• CPC Class Codes: G02B 6/389 characterised by the method of fastening connecting plugs and sockets, e.g. screw- or nut-lock, snap-in, bayonet type

Abstract

A fiber optic connector couples multiple pairs of single fiber, fiber optic transmission lines. The connector includes identical sub-assemblies releasably coupled. Each sub-assembly has a plurality of holders to which the ends of the fibers are connected. Each holder has a plug and a receptacle fitted into corresponding elements on an aligned holder so as to position the ends of mating fibers in axial alignment for efficient transmission of light energy therebetween. The holders are mounted in a loose arrangement and an elastomeric pad or cushion suspends mated holders. Excessive coupling forces are transmitted through the housings directly and do not affect the holders and fibers carried thereby.

Claims

1. In a fiber optic connector for optically coupling a plurality of pairs of single fibers in end-to-end relationships, the combination comprising:

first and second identical sub-assemblies releasably connected to each other and being movable between connected and disconnected positions;

releasable means for holding said sub-assemblies in said connected position;

first and second identical housings interfitted with each other and forming respective parts of said first and second sub-assemblies, said housings having first aligning means allowing movement of said sub-assemblies into said connected position only when said housings are in a predetermined orientation relative to each other;

first and second sets of identical holders respectively loosely mounted in said first and second housings in an abutting side-by-side relationship, said holders in each set being movable relative to each other, each holder having a plug and a receptacle, each holder being connected to two fibers with one fiber extending through such holder and terminating at the end of said plug and with the other fiber extending through said holder parallel to said one fiber and terminating at the end of said receptacle, and first and second sets of holders being interfitted with each other with said plugs of said first set mated with receptacles of said second set and said plugs of said second set mated with receptacles of said first set, said holders having second aligning means whereby the ends of said fibers in said first set are optically aligned with and coupled to the ends of said fibers in said second set, for the efficient transmission of light energy between aligned fibers;

said first aligning means being operative when said housings are in said predetermined orientation, to further coarsely align the ends of each pair of fibers;

and first and second biasing means in said first and second sub-assemblies biasing said first and second sets of holders in a first direction toward engagement with first portions of said first and second housings while allowing movement of said holders in a direction opposite to said first direction and laterally thereof during movement of said sub-assemblies into said connected position, said second aligning means being operative during such movement of said sub-assemblies to laterally shift individual ones of said holders so as to exactly axially align all pairs of said fibers.

2. The combination of claim 1 wherein

said second aligning means comprising:

each plug has a locating and aligning first shoulder, each receptacle has a locating and aligning edge engaged with one of said first shoulders, each engaged shoulder and edge positioning the associated fibers in axial alignment with each other.

3. The combination of claim 2 wherein:

each aligned pair of fibers has two faces at the ends of such fibers, said faces being parallel to each other and perpendicular to the axes of such fibers.

4. The combination of claim 2 wherein:

each plug is coaxial with the fiber extending therethrough and has a tip of reduced diameter, a medial tapered shoulder forming said first shoulder, and a base portion of enlarged diameter;

each receptacle has an outer portion of enlarged diameter surrounding said base, a medial tapered shoulder, and an inner portion of reduced diameter surrounding said tip and intersecting said medial tapered shoulder to form said locating and aligning edge.

5. The combination of claim 1 wherein:

said holders are movable relative to each other and to said housings;

and said tips are tapered;

each said tip and said first shoulder being operative during interfitting movement thereof into an aligned receptacle to shift said associated holders laterally and eliminate any axial misalignment between the associated pair of fibers.

6. The combination of claim 1 wherein:

said biasing means tends to force said sub-assemblies out of said mated relationship;

said sub-assemblies further including releasable fastening means holding said sub-assemblies together and providing a connecting force greater than forces generated by said biasing means;

said housings further having abutting stop faces preventing any forces in excess of said forces generated by said biasing means, from acting on said holders.

7. In a fiber optic connector for optically coupling a plurality of pairs of single fibers to form a plurality of parallel, fiber optic transmission lines, the combination comprising:

first and second housings movable relative to each other between connected and disconnected positions, said housings having aligning means thereon allowing movement of said housings into said connected position only when said housings are in a predetermined orientation relative to each other, said housings having first and second central openings aligned in said connected position;

releasable means for holding said housings in said connected position;

a plurality of first holders loosely mounted side-by-side in said first opening, said holders corresponding in number to the number of pairs of said single fibers,

a like plurality of second holders mounted side-by-side in said second opening and aligned with said first holders in said connected position and when said housings are in said predetermined orientation, each of said second holders being associated with one of said first holders;

said fibers being connected to said holders so that one fiber of each pair is connected to a first holder and the other fiber of such pair is connected to the associated second holder,

said aligning means being operative to coarsely align the associated fibers of each pair when said housings are in said predetermined orientation;

each first holder having a plug coaxial with said fiber connected thereto and provided with a concentric tapered first shoulder,

each second holder having a receptacle provided with a circular edge engagable with said first shoulder in said first holder and operative upon movement of said housings into said connected position to laterally move said first and second holders so as to move the ends of the fibers connected to such holders, from positions of coarse axial alignment into positions of exact axial alignment,

and biasing means in said first and second housings biasing said first and second holders towards each other in said connected position to maintain said first shoulder and said edge engaged, said biasing means further biasing said first and second holders into engagement with portions of said first and second housings, when in said disconnected position, said biasing means allowing said holders to move laterally and longitudinally relative to said housings upon movement thereof from said disconnected position into said connected position.

8. The combination of claim 7 comprising:

a first plate connected to said first housing;

a first elastomeric cushion held between said first plate and said first holders;

a second plate connected to said second housing;

and a second elastomeric cushion held between said second plate and said second holders;

said biasing means comprising said first and second cushions.

9. The combination of claim 7 wherein:

said biasing means generates a first force tending to move said housings from said connected position, and said releasable holding means generates a second force at least equal in magnitude to said first force in opposition thereto.

10. The combination of claim 9 wherein:

said first and second housings having portions thereof abutted in said connected position and operative to prevent any portion of said second force greater than said first force from being transmitted through any of said plugs and receptacles.

11. The combination of claim 7 wherein:

each plug is rigid and has a cylindrical base, and a tapered tip, said first shoulder extending between said base and said tip;

and each receptacle having an outer portion, an inner portion, and a second shoulder extending between said outer portion and said inner portion and forming said circular edge.

12. The combination of claim 7 comprising:

a further like plurality of second pairs of fibers;

each holder having a plug and a receptacle interfitted into a receptacle and a plug on an aligned holder;

all of said fibers being connected so that each holder is connected to two fibers.