Multifiber alignment adapter and associated fiber optic connector subassembly

• US 6,305,850 B1
• Filed: 12/31/1998
• Issued: 10/23/2001
• Est. Priority Date: 12/31/1998
• Status: Expired due to Fees

• Current Assignee: Siecor Operations, LLC (Corning Incorporated)
• Original Assignee: Corning Cable Systems LLC (Corning Incorporated)
• Inventors: Luther, James P., Wagner, Karl M.
• Primary Examiner(s): Font, Frank G.
• Assistant Examiner(s): STAFIRA, MICHAEL PATRICK
• Application Number:
  US09/224,679
• Time in Patent Office: 1,027 Days
• Field of Search: 385/78, 385/83, 385/84
• US Class Current: 385/78
• CPC Class Codes: G02B 6/3833 Details of mounting fibres in ferrules; Assembly methods; Manufacture
• CPC Class Codes: G02B 6/3837 forwarding or threading methods of light guides into apertures of ferrule centering means

Abstract

A multifiber connector subassembly is provided that includes a ferrule and a multifiber alignment adapter for individually guiding the plurality of individual optical fibers into alignment with respective ones of the bores or microholes defined by the ferrule. In this regard, the ferrule includes a forward portion that defines the plurality of bores for receiving respective end portions of a plurality of optical fibers and a rear portion that defines an opening of a predetermined shape. The multifiber alignment adapter defines a plurality of lengthwise extending passageways for receiving respective ones of the plurality of optical fibers. The multifiber alignment adapter also has a forward end having an exterior shape that corresponds to the predetermined shape of the opening defined by the rear portion of the ferrule. As such, the forward end of the multifiber alignment adapter can be positioned within the opening defined by the rear portion of the ferrule such that each passageway defined by the multifiber alignment adapter is aligned with a respective bore defined by the ferrule. Accordingly, the multifiber connector subassembly can guide each individual optical fiber through a passageway and into the respective bore defined by the ferrule without being stubbed or otherwise damaged and without requiring that the optical fibers be ribbonized.

Claims

1. A multifiber connector subassembly comprising:

a ferrule having forward and rear portions, wherein the forward portion of said ferrule defines a plurality of bores for receiving respective end portions of a plurality of optical fibers, and wherein the rear portion of said ferrule defines an opening having a predetermined shape; and

a multifiber alignment adapter having a forward end disposed within the opening defined by the rear portion of said ferrule, wherein said multifiber alignment adapter defines a plurality of lengthwise extending passageways for receiving respective ones of the plurality of optical fibers,

wherein at least the forward end of said multifiber alignment adapter has an exterior shape that corresponds to the predetermined shape of the opening defined by the rear portion of said ferrule to thereby position the forward end of said multifiber alignment adapter within the opening defined by the rear portion of said ferrule such that each passageway of said multifiber alignment adapter is aligned with a respective bore of said ferrule to facilitate insertion of an optical fiber into the respective bore.

2. A multifiber connector subassembly according to claim 1 wherein each bore defined by said ferrule has a lengthwise extending axis, wherein each passageway defined by said multifiber alignment adapter has a lengthwise extending axis, and wherein each passageway of said multifiber alignment adapter is aligned with a respective bore of said ferrule such that the lengthwise extending axis of each passageway extends collinearly with the lengthwise extending axis of the respective bore of said ferrule.

3. A multifiber connector subassembly according to claim 1 wherein the plurality of passageways defined by said multifiber alignment adapter comprise a plurality of lengthwise extending grooves.

4. A multifiber connector subassembly according to claim 3 wherein the grooves defined by said multifiber alignment adapter open outwardly through opposed lateral sides thereof.

5. A multifiber connector subassembly according to claim 1 wherein said multifiber alignment adapter comprises an adapter body extending lengthwise between opposed forward and rear ends, said adapter body including a forward segment proximate the forward end that defines a plurality of lengthwise extending bores for receiving respective one of the plurality of optical fibers.

6. A multifiber connector subassembly according to claim 5 wherein said adapter body further comprises an elongate rear portion extending rearwardly from the forward segment of said adapter body.

7. A multifiber connector subassembly according to claim 1 wherein said multifiber alignment adapter has an exterior surface having a stepped configuration such that a forward portion of said multifiber alignment adapter proximate the forward end is smaller in lateral cross-section than a rear portion of said multifiber alignment adapter proximate the rear end.

8. A multifiber connector subassembly according to claim 1 further comprising a lead in tube having a first end inserted into the opening defined by the rear portion of said ferrule, said lead in tube at least partially surrounding said multifiber alignment adapter.

9. A multifiber alignment adapter capable of guiding a plurality of optical fibers into respective bores defined by a ferrule, the multifiber alignment adapter comprising:

an adapter body extending lengthwise between opposed forward and rear ends, said adapter body including a forward portion proximate the forward end that defines a plurality of lengthwise extending bores, said adapter body also including an elongate rear portion extending rearwardly from the forward portion,

wherein at least the forward end of said adapter body is shaped to correspond to an opening defined by a rear portion of the ferrule, and wherein the forward end of said adapter body is therefore capable of being inserted into the opening defined by the ferrule such that each bore of said adapter body will be aligned with a respective bore defined by the ferrule, thereby facilitating insertion of optical fibers into respective bores defined by the ferrule.

10. A multifiber alignment adapter according to claim 9 wherein the elongate rear portion defines a plurality of lengthwise extending grooves aligned with respective ones of the bores defined by the forward portion.

11. A multifiber alignment adapter according to claim 10 wherein the grooves defined by the rear portion of said adapter body open outwardly through opposed lateral sides of said adapter body.

12. A multifiber alignment adapter according to claim 9 wherein the forward portion of said adapter body has a generally rectangular shape in lateral cross-section to thereby facilitate insertion of the forward end of said adapter body into an opening defined by the ferrule that also has a generally rectangular shape.

13. A multifiber alignment adapter capable of guiding a plurality of optical fibers into respective bores defined by a ferrule, the multifiber alignment adapter comprising:

an adapter body extending lengthwise between opposed forward and rear ends, said adapter body defining a plurality of lengthwise extending passageways for receiving respective end portions of a plurality of optical fibers, said adapter body also including an exterior surface having a stepped configuration such that a forward portion of said adapter body proximate the forward end is smaller in lateral cross-section than a rear portion of said adapter body proximate the rear end,

wherein at least the forward end of said adapter body is shaped to correspond to an opening defined by a rear portion of the ferrule, and wherein the forward end of said adapter body is therefore capable of being inserted into the opening defined by the ferrule such that each passageway defined by said adapter body will be aligned with a respective bore defined by the ferrule, thereby facilitating insertion of optical fibers into respective bores defined by the ferrule.

14. A multifiber alignment adapter according to claim 13 wherein the plurality of passageways defined by said adapter body comprise a plurality of grooves that extend lengthwise between the forward and rear ends of said adapter body.

15. A multifiber alignment adapter according to claim 14 wherein the grooves defined by said adapter body open outwardly through opposed lateral sides of said adapter body.

16. A multifiber alignment adapter according to claim 13 wherein the forward end of said adapter body is beveled to thereby facilitate insertion of the forward end of said adapter body into an opening defined by the ferrule that is correspondingly beveled.

17. A multifiber ferrule comprising:

a ferrule body extending lengthwise between opposed forward and rear ends, said ferrule body defining a plurality of bores for receiving respective end portions of a plurality of optical fibers, wherein the plurality of bores defined by said ferrule body open through the forward end of said ferrule body such that the end portions of the optical fibers will thereby be exposed,

wherein at least a portion of each bore is smoothly tapered such that the dimensions of the tapered portion of the bore decrease in a direction extending from the rear end of said ferrule body toward the forward end of said ferrule body,

wherein each bore also includes a first cylindrical portion extending from the forward end of said ferrule body to the tapered portion, and wherein the tapered portion tapers inwardly in a forwardly extending direction to a lateral cross-sectional size that matches the first cylindrical portion in lateral cross-section to thereby permit the tapered portion of each bore to guide the end portion of a respective optical fiber through the bore and into the first cylindrical portion as the end portion of the optical fiber is advanced toward the forward end of said ferrule body.

18. A multifiber ferrule according to claim 17 wherein each bore further includes a second cylindrical portion extending rearwardly from the tapered portion, and wherein the tapered portion tapers outwardly in a rearwardly extending direction to a lateral cross-sectional size that matches the second cylindrical portion in lateral crosssection section such that the second cylindrical portion is larger in lateral cross-section than the first cylindrical portion.

19. A multifiber ferrule according to claim 17 wherein said ferrule body further defines a common opening proximate the rear end of said ferrule body, and wherein each of the bores defined by said ferrule body opens into the common opening such that each of the plurality of optical fibers can extend through the common opening defined by said ferrule body and into a respective bore.