Contact for terminating an optical fiber

Abstract

An optical fiber contact for terminating an optical fiber includes a solid multi-part thermoset mixture in a cavity in a front portion of the contact, an optical fiber being terminated by heating the thermoset so as to cause it to soften and liquify and subsequently inserting an optical fiber through the contact. The thermoset when liquified chemically reacts so as to form an epoxy adhesive which secures the optical fiber within the contact and keeps the optical fiber in place even when subjected to extremely wide temperature variations.

What is claimed is: 
     
       1. An optical fiber contact for terminating an optical fiber comprising: a contact body having a cavity .[.and an aperture.]. through which an optical fiber to be terminated can extend; and   a solid substantially uncured thermoset disposed within the cavity through which the optical fiber can be inserted .[.subsequent to softening the thermoset within the cavity.]., the thermoset comprising a multi-component room-temperature stable solid mixture which when heated softens, liquifies, mixes and then cures to form an adhesive capable of adhering to the optical fiber and the contact body.Iadd., the thermoset being disposed in the cavity in a hardened form prior to any part of the optical fiber being inserted into the contact body.Iaddend..   
     
     
       2. The contact of claim 1, the adhesive consisting essentially of a solid mixture of novolac epoxy resin, either dicyandiamide or substituted dicyandiamide, and imidazole. 
     
     
       3. The contact of claim 1, the thermoset being cylindrically shaped so as to have a bore in a central region thereof through which the optical fiber can be inserted. 
     
     
       4. The contact of claim 1, the thermoset completely filing a cross-sectional area of the cavity. .[.5. The contact of claim 1, an empty reservoir being formed adjacent a front end of the aperture, the front end of the aperture being on a front of the contact body whereat a front end 
     
     
        of an optical fiber to be terminated is located..]. 6. The contact of claim 1, the contact body having a front face adjacent a front end thereof whereat an end of the optical fiber being terminated can be optically connected to another optical fiber, a back end of the contact body having a plurality of flanges extending from an outer surface thereof, the flanges forming at least one annular reservoir on the surface of the contact body between the flanges, and further comprising a second solid adhesive disposed in the reservoir for adhering to fiber braids subsequent 
     
     
        to softening the second adhesive. 7. The contact of claim 6, the flanges forming at least one reservoir extending circumferentially around the contact body along a direction essentially perpendicular to a longitudinal axis of the contact body, the optical fiber being terminated being 
     
     
        disposed within the aperture. 8. The contact of claim 7, further comprising means for urging braids of an optical fiber cable into the 
     
     
        second adhesive. 9. The contact of claim 8, the urging means comprising a dimensionally recoverable member which when heated recovers radially inward and attempts to conform to a shape of the outer surface of the 
     
     
        contact body and the second adhesive. 10. The contact of claim 6, the contact body including first and second tubes and a ring, the ring being press fitted onto the second tube adjacent a flange thereof, the first tube being telescopically press fitted onto said second tube so as to form a gap between a back end of the first tube and a front end of the ring. 
     
     
            An optical fiber contact for terminating an optical fiber, comprising: a contact body having a front face adjacent a front end thereof whereat an end of an optical fiber being terminated can be optically connected to another optical fiber, a back end of the contact body having a plurality of flanges extending from an outer surface thereof, the flanges forming at least one annular reservoir on the surface of the contact body between the flanges; and   a solid adhesive disposed in the reservoir and secured to the contact body into which optical fiber braids can be embedded and secured thereto subsequent to softening the adhesive and forcing the braids into the softened adhesive;   the contact body including first and second tubes and a ring, the ring being press fitted onto the second tube adjacent a flange thereof, the first and second tubes being telescopically press fitted together such that a back end of the first tube and a front end of the ring are   
     
     
        separated a predetermined precise distance. 12. The contact of claim 11, the contact body having an aperture therein through which the optical fiber being terminated can be inserted, the flanges forming at least one reservoir and extending circumferentially around the contact body along a direction essentially perpendicular to a longitudinal axis of the contact 
     
     
        body, the optical fiber being disposed within the aperture. 13. The contact of claim 11, further comprising means for urging the braids of an 
     
     
        optical fiber cable into the adhesive. 14. The contact of claim 13, the urging means comprising a dimensionally recoverable member which when heated recovers radially inward and attempts to conform to a shape of the outer surface of the contact body and the adhesive, the recoverable member when heated conducting sufficient heat to the adhesive so as to cause the 
     
     
        braids to be embedded therewithin. 15. The contact of claim 11, further comprising a spring disposed around the contact body such that a front end of the spring contacts the ring so as to limit forward movement of the 
     
     
        spring along an outer surface of the contact body. 16. An optical fiber contact for terminating an optical fiber, comprising: a contact body having a cavity therein and an aperture through which an optical fiber to be terminated can extend, a reservoir being formed adjacent a front end of the aperture, the front end of the aperture being on a front of the contact body whereat a front end of the optical fiber to be terminated is located;   an optical fiber disposed within the contact body, an end of the fiber having a resiliently deformable index matching solid disposed thereon, the reservoir being empty so as to allow accommodation of at least part of said index matching solid therein upon deformation thereof by contact with   
     
     
        an end of a mating optical fiber. 17. The contact of claim 16, the optical fiber being terminated by being disposed through the contact body and the contact body aperture, the reservoir being sized so as to allow the resiliently deformable index matching solid disposed on the end of the optical fiber to deform and substantially flatten when compressed against the end of the mating optical fiber being optically connected to the 
     
     
        terminated optical fiber. 18. The contact of claim 17, further comprising a solid thermoset disposed within the cavity, the thermoset comprising a multicomponent mixture which when heated softens, liquifies, mixes and cures to form an adhesive capable of adhering to the optical fiber being terminated and the contact body, a portion of the cured thermoset comprising the resiliently deformable index matching solid which is 
     
     
        disposed on the end of the optical fiber. 19. An optical fiber contact for terminating an optical fiber, comprising: a contact body having a cavity therein and an aperture through which the optical fiber to be terminated can extend, the contact body comprising a ring and first and second tubes, the ring being disposed against a flange of the second tube, the first and second tubes being telescopically press fitted together such that a back end of the first tube is separated from a front end of the ring so as to form a gap therebetween, a length of the gap being controlled so as to precisely control a distance between a front end of the first tube and the front end of the ring, the ring being press   
     
     
        fitted onto the second tube. 20. The contact of claim 19, further comprising a solid thermoset disposed within the cavity through which the optical fiber can be inserted, the thermoset comprising a multicomponent mixture which when heated softens, liquifies, mixes and cures to form an adhesive capable of adhering to the optical fiber and the contact body. 
     
     
            The contact of claim 19, a reservoir being formed adjacent a front end 
     
     
        of the aperture. 22. A method of terminating an optical fiber, comprising the steps of: cleaving an end of the optical fiber; and thereafter   inserting the cleaved optical fiber end through an aperture of a contact body such that the cleaved end of the optical fiber is substantially flush with a front face of the contact body;   heating the contact body prior to inserting the cleaved optical fiber end therethrough so as to liquify a solid thermoset material therewithin such that a portion of the liquid thermoset material is disposed on and adheres   
     
     
        to the cleaved optical fiber end. .Iadd.23.  A method of terminating an optical fiber, comprising the steps of: first disposing a solid thermoset within a cavity of a contact body having the cavity therein through which an optical fiber to be terminated can extend, the thermoset being disposed in the cavity in a substantially unreacted form, the thermoset comprising a multi-component room-temperature stable solid mixture which when heated softens, liquifies, mixes and then cures to form an adhesive capable of adhering to the optical fiber and the contact body;   then inserting the optical fiber through the thermoset and through the contact cavity after the thermoset has been disposed within the cavity;   heating the thermoset so as to soften and liquify the thermoset. .Iaddend. .Iadd.24. The method of claim 23, the thermoset being heated after the optical fiber has been inserted through the thermoset. .Iaddend. .Iadd.25. The method of claim 24, the substantially unreacted thermoset having a preformed bore in a central region thereof through which the optical fiber is inserted. .Iaddend. .Iadd.26. The method of claim 25, further comprising the step of disposing an index matching material on an end of the fiber subsequent to inserting it through the contact body. .Iaddend. .Iadd.27. The method of claim 23, the thermoset being heated prior to   
     
     
        inserting the optical fiber through the thermoset. .Iaddend. .Iadd.28. The method of claim 27, the substantially unreacted thermoset completely filling the cavity. .Iaddend. .Iadd.29. The method of claim 23, the contact body including an aperture therein through which the optical fiber to be terminated can extend, a front end of the contact aperture being on a front of the contact body, the contact cavity being adjacent a back of the aperture, and further comprising a conical-shaped reservoir adjacent the front of the contact body. .Iaddend. .Iadd.30. The method of claim 23, the adhesive consisting essentially of a solid mixture of novolac epoxy resin, either dicyandiamide or substituted dicyandiamide, and imidazole. .Iaddend. .Iadd.31. The method of claim 23, the contact body having a front face adjacent a front end thereof whereat an end of the optical fiber being terminated can be optically connected to another optical fiber, a back end of the contact body having a plurality of flanges extending from an outer surface thereof, the flanges forming at least one annular reservoir on the surface of the contact body between the flanges. .Iaddend. .Iadd.32. The method of claim 31, further comprising the step of disposing a second solid adhesive in the reservoir, the flanges preferably forming at least one reservoir extending circumferentially around the contact body along a direction essentially perpendicular to a longitudinal 
     
     
        axis of the contact body. .Iaddend. .Iadd.33.  The method of claim 32, further comprising the step of urging braids of an optical fiber cable into the second adhesive using a dimensionally recoverable member which when heated recovers radially inward and attempts to conform to a shape of the outer surface of the contact body and the second adhesive. .Iaddend. .Iadd.34. The method of claim 33, the contact body including first and second tubes and a ring, and further comprising the steps of press fitting the ring onto the second tube adjacent a flange thereof, and telescopically press fitting the first tube onto said second tube so as to form a gap between a back end of the first tube and a front end of the 
     
     
        ring. .Iaddend. .Iadd.35.  The contact of claim 1, the contact body including an aperture adjacent the cavity, an empty reservoir being formed adjacent a front end of the aperture, the front end of the aperture being on a front of the contact body whereat a front end of an optical fiber to be terminated is located. .Iaddend.