Multi-fiber optic receptacle and plug assembly

• US 7,264,402 B2
• Filed: 03/10/2005
• Issued: 09/04/2007
• Est. Priority Date: 03/10/2005
• Status: Active Grant

• Current Assignee: Corning Optical Communications LLC (Corning Incorporated)
• Original Assignee: Corning Cable Systems LLC (Corning Incorporated)
• Inventors: Luther, James P., Theuerkorn, Thomas, Norris, Martin E.
• Primary Examiner(s): Song; Sarah
• Application Number:
  US11/076,684
• Publication Number:
  US 20060204178A1
• Time in Patent Office: 908 Days
• Field of Search: 385/53, 385/55, 385/56, 385/60, 385/72, 385/78, 385/58, 385/70
• US Class Current: 385/59
• CPC Class Codes: G02B 6/3821 with axial spring biasing or loading means G02B6/3847 takes precedence
• CPC Class Codes: G02B 6/3831 comprising a keying element on the plug or adapter, e.g. to forbid wrong connection keying element on the ferrule G02B6/3851; keying element for electrical coupling H01R13/64
• CPC Class Codes: G02B 6/3851 Ferrules having keying or coding means
• 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 6/38875 Protection from bending or twisting
• CPC Class Codes: G02B 6/3888 Protection from over-extension or over-compression
• CPC Class Codes: G02B 6/545 Pulling eyes G02B6/475 takes precedence

Abstract

A fiber optic receptacle and plug assembly adapted to be mounted within an opening through a wall of a connection terminal. The receptacle and plug define complimentary alignment and keying features for ensuring that the plug is mated with the receptacle in a predetermined orientation. An alignment sleeve is disposed within the plug for receiving a multi-fiber receptacle ferrule and a multi-fiber plug ferrule. The fiber optic receptacle and corresponding plug each include a biasing member assembly for urging the receptacle ferrule and the plug ferrule towards one another, wherein the biasing member assembly includes a round spring, a spring centering cuff and a ferrule boot that operatively engage the rear of the receptacle ferrule and the plug ferrule, respectively, to substantially center a spring biasing force on the end face of the receptacle ferrule and the plug ferrule.

Claims

1. A multi-fiber fiber optic receptacle and plug assembly, comprising:

a fiber optic receptacle adapted to be mounted within an opening through a wall of a connection terminal, the receptacle defining a first alignment and keying feature;

a fiber optic plug mounted upon an end of a fiber optic cable and defining a complimentary second alignment and keying feature for operatively engaging the first alignment and keying feature of the receptacle, the complimentary second alignment and keying feature ensuring that the plug is mated to the receptacle in a predetermined orientation; and

an alignment sleeve disposed within the plug

wherein the fiber optic receptacle further comprises a receptacle honsing defining an internal cavity, a multi-fiber receptacle ferrule disposed at least partially within the internal cavity, a ferrule boot, a spring centering cuff, a biasing spring and a ferrule retainer, and wherein the ferrule boot, the spring centering cuff and the biasing spring operatively enaage the receptacle ferrule to substantially center a spring biasing force generated by the biasing spring on an end face of the receptacle ferrule.

2. The multi-fiber fiber optic receptacle and plug assembly of claim 1, wherein the first alignment and keying feature of the receptacle comprises at least one key and the complimentary second alignment and keying feature of the plug comprises at least one key slot sized to receive the at least one key.

3. The multi-fiber fiber optic receptacle and plug assembly of claim 2, wherein the plug further comprises an outer housing for housing the alignment sleeve, and wherein the at least one key comprises a first protruding feature formed on the receptacle housing and the at least one key slot comprises a first slot formed in the alignment sleeve and a second slot formed in the outer housing, and wherein the first protruding feature is simultaneously received within the first slot and the second slot.

4. The fiber optic receptacle and plug assembly of claim 1, wherein the fiber optic plug further comprises a plug sub-assembly comprising an inner housing defining a passageway, a multi-fiber plug ferrule, a ferrule boot, a spring centering cuff and a biasing spring at least partially disposed within the passageway, and wherein the ferrule boot, the spring centering cuff and the biasing spring operatively engage the plug ferrule to substantially center a spring biasing force generated by the biasing spring on an end face of the plug ferrule.

5. The fiber optic receptacle and plug assembly of claim 1, wherein the first alignment and keying feature of the receptacle and the complimentary second alignment and keying feature of the plug assists in gross alignment of a receptacle ferrule end an opposing plug ferrule within the alignment sleeve.

6. A multi-fiber fiber optic receptacle and plug assembly, comprising:

a fiber optic receptacle defining a first alignment and keying feature, the receptacle comprising;

a receptacle housing defining an internal cavity;

a ferrule retainer secured to the receptacle housing;

a receptacle ferrule at least partially disposed within the internal cavity of the receptacle housing and at least partially disposed within the ferrule retainer;

a biasing spring for biasing the receptacle ferrule in the direction of the receptacle housing; and

a fiber optic plug adapted to be mated with the receptacle and defining a complimentary second alignment and keying feature, the plug comprising;

a plug outer housing defining a passageway;

a plug sub-assenably disposed within the passageway and comprising an inner housing, a plug ferrule and a biasing spring, the plug ferrule a least partially disposed within the inner housing; and

an alignment sleeve disposed adjacent a forward end of the inner housing, the plug ferrule at least partially disposed within the alignment sleeve; and

wherein the second alignment and keying feature of the plug operatively engages the first alignment and keying feature of the receptacle when the plug is inserted into the receptacle to properly align the receptacle ferrule and the plug ferrule in opposing relation; and

wherein the receptacle and the plug each further comprise a ferrule boot for engaging the rear of the receptacle ferrule and the plug ferrule, respectively, and a spring centering cuff for engaging the rear surface of the corresponding ferrule boot, and wherein the biasing spring, the spring centering cuff and the ferrule boot of the receptacle and the plug operatively engage the rear of the receptacle ferrule and the plug ferrule, respectively, to substantially center a spring biasing force on the center of an end face of the receptacle ferrule and plug ferrule, respectively.

7. The multi-fiber fiber optic receptacle and plug assembly of claim 6, wherein the receptacle ferrule and the plug ferrule are each multi-fiber ferrules of like configuration and wherein the at least one alignment and keying feature of the receptacle further comprises an excluding feature to prevent a plug ferrule of dissimilar configuration from being inserted into the receptacle and mated with the receptacle ferrule.

8. The multi-fiber fiber optic receptacle and plug assembly of claim 7, wherein the receptacle housing comprises a threaded portion and wherein the plug comprises a threaded coupling nut for engaging the threaded portion of the receptacle to secure the plug to the receptacle.

9. A fiber optic receptacle and plug comprising:

a fiber optic receptacle defining an internal cavity and a first alignment and keying feature disposed within the internal cavity;

a multi-fiber receptacle ferrule disposed within the internal cavity;

a fiber optic plug comprising a plug outer housing defining a passageway;

an alignment sleeve disposed at least partially within the receptacle end at least partially within the plug when the plug is inserted into the receptacle; and

a multi-fiber plug ferrule at least partially disposed within the aliguxoent sleeve and at least partially disposed within the outer housing;

wherein the outer housing and the alignment sleeve defining a second complimentary alignment and keying feature for engaging the first alignment and keying feature of the receptacle when the plug is mated with the receptacle to ensure that the receptacle ferrule is aligned with the plug ferrule in a predetermined orientation;

wherein the receptacle and the plug each further comprise a biasing member assembly for urging the receptacle ferrule and the opposing plug ferrule toward one another when the plug is inserted into the receptacle; and

wherein the at least one biasing member assembly comprises a round biasing spring, a spring centering cuff and a ferrule boot, and wherein the round biasing spring engages a rear surface of the spring centering cuff;

a generally concave forward surface of the spring centering cuff engages a generally convex rear surface of the ferrule boot engages a rear surface of the receptacle ferrule and the plug ferrule, respectively, to center a spring biasing force generated by the round biasing spring substantially on the center of the end face of the receptacle ferrule and the plug ferrule, respectively.

10. The optical connector of claim 9, wherein the first alignment and keying feature comprises one of a key and a key slot, and wherein the second alignment and keying feature comprises the other of a key and a key slot.