Fiber optic cable assembly and fabrication method using sequentially arranged boots for multi-fiber ferrule

Patent metadata

Field	Value
Publication number	US-10451830-B2
Application number	US-201715848616-A
Country	US
Kind code	B2
Filing date	Dec 20, 2017
Priority date	Dec 29, 2016
Publication date	Oct 22, 2019
Grant date	Oct 22, 2019

Abstract

At least one group of loose optical fibers is restrained at multiple locations during fabrication of a fiber optic cable assembly using rear and front ferrule boots, thereby avoiding a need for traditional ribbonizing techniques. The group(s) of loose optical fibers are inserted through one or more apertures defined in each of the rear ferrule boot and the front ferrule boot, and inserted through at least one group of bores defined in a ferrule. A rear portion of the ferrule receives at least a portion of the front ferrule boot. A manufacturing fixture including a removable jig may retain a rear ferrule boot and a medial section of the group(s) of loose optical fibers, while the front ferrule boot and a terminal section of the group(s) of loose optical fibers are positioned outside the fixture for further processing. A fiber optic cable assembly including front and rear ferrule boots, as well as methods of fabrication, are further provided.

First claim

What is claimed is:

1. A fiber optic cable assembly comprising:
a fiber optic cable;
a ferrule comprising a front end face and defining at least one group of bores extending through the front end face;
at least one group of optical fibers emanating from the fiber optic cable and extending through the at least one group of bores, wherein ends of optical fibers of the at least one group of optical fibers are terminated proximate to the front end face, and the optical fibers of the at least one group of optical fibers are restrained within the ferrule proximate to the at least one group of bores;
a front ferrule boot defining at least one aperture through which the at least one group of optical fibers extends; and
a rear ferrule boot defining at least one aperture through which the at least one group of optical fibers extends;
wherein at least a forward portion of the front ferrule boot is received within a rear portion of the ferrule;
wherein the front ferrule boot is positioned between a portion of the ferrule and the rear ferrule boot; wherein the at least one group of optical fibers is non-ribbonized when extending through the at least one aperture in the front ferrule boot and through the at least one aperture in the rear ferrule boot. and
wherein:
the at least one group of optical fibers comprises a first group of optical fibers and a second group of optical fibers;
the at least one aperture defined by the front ferrule boot comprises a first aperture through which the first group of optical fibers extends and a second aperture through which the second group of optical fibers extends; and
the at least one aperture defined by the rear ferrule boot comprises a first aperture through which the first group of optical fibers extends and a second aperture through which the second group of optical fibers extends.

2. The fiber optic cable assembly of claim 1 , wherein:
the first aperture of the front ferrule boot is laterally offset relative to the second aperture of the front ferrule boot; and
the first aperture of the rear ferrule boot is laterally offset relative to the second aperture of the rear ferrule boot.

3. The fiber optic cable assembly of claim 1 , wherein:
the first aperture of the front ferrule boot is vertically offset relative to the second aperture of the front ferrule boot; and
the first aperture of the rear ferrule boot is vertically offset relative to the second aperture of the rear ferrule boot.

4. The fiber optic cable assembly of claim 1 , wherein the front ferrule boot comprises at least one of a height dimension or a width dimension that exceeds a corresponding height dimension or width dimension of the rear ferrule boot.

5. The fiber optic cable assembly of claim 1 , further comprising a housing received over at least a portion of the ferrule, and at least one spring arranged to bias the ferrule within the housing so that a front portion of the ferrule extends beyond a front end of the housing.

6. The fiber optic cable assembly of claim 1 , further comprising:
a pin keeper positioned proximate to a rear surface of the ferrule; and
guide pins extending forward from the pin keeper and through pin holes defined in the ferrule so as to project beyond the front end face.

7. The fiber optic cable assembly of claim 6 , further comprising:
a housing received over at least a portion of the ferrule;
a crimp body that projects rearwardly from the housing; and
at least one spring positioned between the pin keeper and the crimp body to exert a biasing force on the ferrule via the pin keeper.

8. The fiber optic cable assembly of claim 1 , wherein:
the at least one group of bores comprises at least three groups of bores;
the at least one group of optical fibers comprises at least three groups of optical fibers;
the at least one aperture defined in the rear ferrule boot comprises at least three apertures; and
the at least one aperture defined in the front ferrule boot comprises at least three apertures.

9. The fiber optic cable assembly of claim 1 , wherein the front ferrule boot is arranged in contact with the rear ferrule boot.

10. The fiber optic cable assembly of claim 1 , wherein the at least one aperture defined in the front ferrule boot and the at least one aperture defined in the rear ferrule boot each comprise a substantially rectangular cross-sectional shape.

11. A fiber optic cable assembly comprising:
a fiber optic cable;
a ferrule comprising a front end face and defining at least one group of bores extending through the front end face;
at least one group of optical fibers emanating from the fiber optic cable and extending through the at least one group of bores, wherein ends of optical fibers of the at least one group of optical fibers are terminated proximate to the front end face, and the optical fibers of the at least one group of optical fibers are restrained within the ferrule proximate to the at least one group of bores;
a front ferrule boot defining at least one aperture through which the at least one group of optical fibers extends;
a rear ferrule boot defining at least one aperture through which the at least one group of optical fibers extends;
a pin keeper positioned proximate to a rear surface of the ferrule;
guide pins extending forward from the pin keeper and through pin holes defined in the ferrule so as to project beyond the front end face;
a housing received over at least a portion of the ferrule;
a crimp body that projects rearwardly from the housing; and
at least one spring positioned between the pin keeper and the crimp body to exert a biasing force on the ferrule via the pin keeper;
wherein at least a forward portion of the front ferrule boot is received within a rear portion of the ferrule;
wherein the front ferrule boot is positioned between a portion of the ferrule and the rear ferrule boot; and
wherein the at least one group of optical fibers is non-ribbonized when extending through the at least one aperture in the front ferrule boot and through the at least one aperture in the rear ferrule boot.

12. A fiber optic cable assembly comprising:
a fiber optic cable;
a ferrule comprising a front end face and defining at least one group of bores extending through the front end face;
at least one group of optical fibers emanating from the fiber optic cable and extending through the at least one group of bores, wherein ends of optical fibers of the at least one group of optical fibers are terminated proximate to the front end face, and the optical fibers of the at least one group of optical fibers are restrained within the ferrule proximate to the at least one group of bores;
a front ferrule boot defining at least one aperture through which the at least one group of optical fibers extends; and
a rear ferrule boot defining at least one aperture through which the at least one group of optical fibers extends;
wherein at least a forward portion of the front ferrule boot is received within a rear portion of the ferrule;
wherein the front ferrule boot is positioned between a portion of the ferrule and the rear ferrule boot;
wherein the at least one group of optical fibers is non-ribbonized when extending through the at least one aperture in the front ferrule boot and through the at least one aperture in the rear ferrule boot; and
wherein:
the at least one group of bores comprises at least three groups of bores;
the at least one group of optical fibers comprises at least three groups of optical fibers;
the at least one aperture defined in the rear ferrule boot comprises at least three apertures; and
the at least one aperture defined in the front ferrule boot comprises at least thr

Assignees

• Corning Optical Communications LLC

Inventors

• Szumacher Maciej Lukasz
• Tran Hieu Vinh
• Works Antwan Joco'Ques

Classifications

• G02B6/3885

  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 title

• G02B6/3898

  Tools, e.g. handheld; Tuning wrenches; Jigs used with connectors, e.g. for extracting, removing or inserting in a panel, for engaging or coupling connectors, for assembling or disassembling components within the connector, for applying clips to hold two connectors together or for crimping (tools for cleaning, G02B6/3866; tools in general B25B) · CPC title

• G02B6/3644

  the coupling means being through-holes or wall apertures · CPC title

• G02B6/3887

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

• G02B6/4495

  Physics · mapped topic