Terminus assembly for terminating an optical cable

Patent metadata

Field	Value
Publication number	US-9256031-B2
Application number	US-201213667420-A
Country	US
Kind code	B2
Filing date	Nov 2, 2012
Priority date	Nov 2, 2012
Publication date	Feb 9, 2016
Grant date	Feb 9, 2016

Abstract

An optical cable assembly includes an optical cable having an end that extends a length. The optical cable includes a plastic optical fiber (POF) and a buffer surrounding the POF along a portion of the length of the end of the optical cable. A terminus assembly terminates the end of the optical cable. The terminus assembly includes a terminus body having a cable passage and a crimp zone. At least a portion of the length of the end of the optical cable extends within the cable passage of the terminus body such that the terminus body surrounds the buffer of the optical cable at the crimp zone. The terminus body is mechanically crimped over, in engagement with, the buffer of the optical cable at the crimp zone.

First claim

What is claimed is:

1. An optical cable assembly comprising:
an optical cable having an end that extends a length, the optical cable including a plastic optical fiber (POP) and a buffer surrounding the POF along a portion of the length of the end of the optical cable, the length of the end of the optical cable comprising a buffer segment, along which the buffer surrounds the POF, and a POF segment along which the POF is exposed; and
a terminus assembly terminating the end of the optical cable, the terminus assembly comprising a terminus body having a single bore extending between a mating end and a cable end of the terminus body, the bore defining a cable passage therethrough between the mating end and the cable end, the cable passage of the terminus body extending a length having a larger-diameter segment and a reduced-diameter segment that has a reduced diameter relative to the larger-diameter segment, the terminus body defining a crimp zone along the larger-diameter segment, at least a portion of the length of the end of the optical cable extending within the cable passage of the terminus body, the buffer segment of the end of the optical cable extending within the larger-diameter segment such that the terminus body surrounds the buffer of the optical cable at the crimp zone, the POF segment of the end of the optical cable extending within the reduced-diameter segment, wherein the terminus body is mechanically crimped over, in engagement with, the buffer of the optical cable at the crimp zone;
wherein the terminus body defines crimp-formed depressions on an exterior surface of the terminus body along the crimp zone, the terminus body further including crimp-formed projections on an interior surface of the terminus body that defines the bore, the crimp-formed projections engaging and partially compressing the buffer of the optical cable at the crimp zone.

2. The optical cable assembly of claim 1 , wherein the terminus body comprises a shoulder that extends radially inwardly within the cable passage between the larger-diameter segment and the reduced-diameter segment of the cable passage, the buffer of the optical cable comprising a buffer end that is engaged with the shoulder of the terminus body.

3. The optical cable assembly of claim 1 , wherein the optical cable further comprises a strength member and a jacket, the strength member surrounding the buffer along a portion of the length of the end of the optical cable, the jacket surrounding the strength member along a portion of the length of the end of the optical cable, the strength member having a member segment that extends over an end of the terminus body, the terminus assembly further comprising a crimp sleeve having a terminus segment and a cable segment that are crimped over, in engagement with, the member segment of the strength member and the jacket, respectively.

4. The optical cable assembly of claim 1 , wherein the terminus assembly comprises a terminus shell extending around the terminus body, and a biasing mechanism, the biasing mechanism being held between the terminus body and the terminus shell for biasing the terminus body and the POF toward a mating POF.

5. The optical cable assembly of claim 4 , wherein the biasing mechanism is a coil spring.

6. The optical cable assembly of claim 1 , wherein a tip segment of the POF extends from the mating end of the terminus body and the terminus assembly does not include a ferrule that extends around the tip segment.

7. The optical cable assembly of claim 1 , wherein the POF comprises a tip segment that is configured to be optically coupled to a mating POF of a mating connector such that there is an air gap between the tip segment of the POF and a tip segment of the mating POF.

8. The optical cable assembly of claim 1 , wherein the POF comprises a core and a cladding that surrounds the core.

9. An optical connector system comprising:
an optical cable having an end that extends a length, the optical cable including a plastic optical fiber (POF) having a tip segment and a buffer surrounding the POF along a portion of the length of the end of the optical cable, the length of the end of the optical cable comprising a buffer segment along which the buffer surrounds the POF, and a POF segment along which the POF is exposed, the POF segment including the tip segment of the POF;
a connector housing extending from a mating end to a cable end;
a terminus assembly terminating the end of the optical cable, the terminus assembly comprising a terminus body held by the connector housing, the terminus body comprising a cable passage, the cable passage of the terminus body extending a length having a larger-diameter segment and a reduced-diameter segment that has a reduced diameter relative to the larger-diameter segment, at least a portion of the length of the end of the optical cable extending within the cable passage, the buffer segment of the end of the optical cable extending within the larger-diameter segment, the POF segment of the end of the optical cable extending within the reduced-diameter segment such that the tip segment of the POF extends outwardly from the mating end of the connector housing, wherein an exterior surface of the terminus body along the larger-diameter segment is mechanically crimped over the buffer segment of the end of the optical cable such that crimp-formed projections on an interior surface of the terminus body engage and partially compress the buffer of the optical cable; and
an alignment block removably mounted to, and extending outwardly from, the mating end of the connector housing, the alignment block comprising a mating receptacle defined by an interior wall of the alignment block, the tip segment of the POF extending within the mating receptacle for optically coupling to a mating POF of a mating connector, wherein a radially outer surface of the tip segment of the POF is engaged with the interior wall of the alignment block within the mating receptacle.

10. The optical connector system of claim 9 , wherein the alignment block comprises at least one of a parallelepiped shape or a cylindrical shape.

11. The optical connector system of claim 9 , wherein the alignment block is at least one of optically or electrically insulative.

12. The optical connector system of claim 9 , wherein the mating receptacle is tapered radially inward to a neck segment, the radially outer surface of the tip segment of the POF being engaged with the interior wall of the alignment block at the neck segment.

13. The optical connector system of claim 9 , wherein the terminus assembly does not include an alignment sleeve that is held within the mating receptacle of the alignment block or a ferrule that extends around the tip segment of the POF.

14. The optical connector system of claim 9 , wherein an air gap extends within the mating receptacle between the tip segment of the POF and a tip segment of the mating POF when the terminus assembly is mated with the mating connector.

15. The optical connector system of claim 9 , wherein the POF comprises a core and a cladding that surrounds the core, the cladding comprising the radially outer surface of the tip segment of the POF.

16. The optical connector system of claim 9 , wherein the terminus body has a unitary, one-piece construction.

17. The optical connector system of claim 9 , wherein the exterior surface of the terminus body defines crimp-formed depressions that align generally with the crimp-formed projections along the interior surface of the terminus body.

18. A terminus assembly for terminating an end of an optic

Assignees

• Tyco Electronics Corp

Inventors

• Barry James Leo
• Fabian David James
• Glatfelter Kyle Jay
• Li Jun
• Mosier James Patrick

Classifications

• G02B6/40 Primary

  having fibre bundle mating means · CPC title

• G02B6/3887

  Anchoring optical cables to connector housings, e.g. strain relief features · CPC title

• G02B6/3821

  with axial spring biasing or loading means (G02B6/3847 takes precedence) · CPC title

• G02B6/3809 Primary

  without a ferrule embedding the fibre end, i.e. with bare fibre end · CPC title

• G02B6/3888

  Protection from over-extension or over-compression · CPC title