Fiber optic connectors and methods for making the same

• US 8,337,093 B2
• Filed: 09/30/2009
• Issued: 12/25/2012
• Est. Priority Date: 09/30/2009
• Status: Active Grant

• Current Assignee: Corning Optical Communications LLC (Corning Incorporated)
• Original Assignee: Corning Cable Systems LLC (Corning Incorporated)
• Inventors: Parkman, Louis E. III
• Primary Examiner(s): Doan, Jennifer
• Application Number:
  US12/570,924
• Publication Number:
  US 20110075972A1
• Time in Patent Office: 1,182 Days
• Field of Search: 385/53, 385/70, 385/72, 385/78, 385/88, 385/89, 385/92
• US Class Current: 385/78
• CPC Class Codes: G02B 6/3821 with axial spring biasing or loading means G02B6/3847 takes precedence
• CPC Class Codes: G02B 6/3851 Ferrules having keying or coding means
• CPC Class Codes: G02B 6/3869 Mounting ferrules to connector body, i.e. plugs
• CPC Class Codes: G02B 6/3871 Ferrule rotatable with respect to plug body, e.g. for setting rotational position adjusting fibre within the ferrule, G02B6/3843; Fixation of ferrules after rotation
• 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: Y10T 29/49117 Conductor or circuit manufacturing

Abstract

Fiber optic connectors and components for fiber optic connectors with improved side-loading performance are disclosed along with methods for making the same. The fiber optic connector includes a ferrule and a ferrule holder where the ferrule holder may be disposed within a housing. The ferrule holder has a forward portion with a spherical feature for cooperating with the housing, thereby allowing relative movement therebetween. Specifically, the spherical feature of the ferrule holder permits rotational translation of the ferrule holder in two degrees of freedom relative to the housing and inhibits the longitudinal translation of the ferrule holder in same two degrees of freedom relative to the housing, thereby providing improved side-loading performance.

Claims

1. A fiber optic connector, comprising:

a ferrule;

a ferrule holder having a forward portion with a spherical feature, the forward portion of the ferrule holder includes a first key and a second key disposed on opposite sides of the forward portion of the ferrule holder; and

a housing for receiving a portion of the ferrule holder, wherein the housing cooperates with the spherical feature of the ferrule holder to permit rotational translation of the ferrule holder in two degrees of freedom relative to the housing and inhibit the longitudinal translation of the ferrule holder in same two degrees of freedom relative to the housing.

2. The fiber optic connector of claim 1, wherein the forward portion includes a first tapered portion and a second tapered portion on opposite sides of the spherical feature of the ferrule holder.

3. The fiber optic connector of claim 1, wherein the ferrule holder snap-fits with the housing.

4. The fiber optic connector of claim 2, wherein the first tapered portion has an angle of ten degrees or less from a longitudinal axis and the second tapered portion has an angle of minus ten degrees or less from the longitudinal axis.

5. The fiber optic connector of claim 1, the fiber optic connector further including a spring and the forward portion of the ferrule holder has a flat front face.

6. The fiber optic connector of claim 1, wherein the ferrule is a multi-fiber ferrule.

7. The fiber optic connector of claim 1, wherein the fiber optic connector is a portion of a fiber optic cable assembly.

8. The fiber optic connector of claim 6, wherein the fiber optic connector has an average delta insertion loss of 0.40 dB or less during a side-loading test applying five pounds force at a reference wavelength of 1550 nm.

9. A fiber optic connector, comprising:

a ferrule;

a ferrule holder having a forward portion with a spherical feature and a keying feature; and

a housing for receiving a portion of the ferrule holder, wherein the housing cooperates with the spherical feature of the ferrule holder to permit rotational translation of the ferrule holder in two degrees of freedom relative to the housing and inhibit the longitudinal translation the ferrule holder in same two degrees of freedom relative to the housing.

10. The fiber optic connector of claim 9, wherein the forward portion includes a first tapered portion and a second tapered portion on opposite sides of the spherical feature of the ferrule holder.

11. The fiber optic connector of claim 10, wherein the first tapered portion has an angle of ten degrees or less from a longitudinal axis and the second tapered portion has an angle of minus ten degrees or less from the longitudinal axis.

12. The fiber optic connector of claim 9, wherein the keying feature includes a first key and a second key disposed on opposite sides of the forward portion of the ferrule holder.

13. The fiber optic connector of claim 9, wherein the ferrule holder snap-fits with the housing.

14. The fiber optic connector of claim 9, the fiber optic connector further including a spring and the ferrule holder has a flat front face.

15. The fiber optic connector of claim 9, wherein the ferrule is a multi-fiber ferrule.

16. The fiber optic connector of claim 9, wherein the fiber optic connector is a portion of a fiber optic cable assembly.

17. The fiber optic connector of claim 16, wherein the fiber optic connector has an average delta insertion loss of 0.40 dB or less during a side-loading test applying five pounds force at a reference wavelength of 1550 nm.

18. A method of making a fiber optic connector, comprising the steps of:

providing a housing;

providing a ferrule holder having a forward portion with a spherical feature and at least one keying feature; and

inserting the ferrule holder into the housing, wherein the housing cooperates with the spherical feature of the ferrule holder to permit rotational translation of the ferrule holder in two degrees of freedom relative to the housing and inhibit longitudinal translation the ferrule holder in same two degrees of freedom relative to the housing.

19. The method of claim 18, further including the step of attaching a ferrule to the ferrule holder.

20. The method of claim 18, further including providing a spring to bias the ferrule holder forward.

21. The method of claim 18, further including the step of aligning the at least one keying feature of the ferrule holder with a cooperating feature of the housing.

22. The method of claim 18, further including the step of attaching the fiber optic connector to a fiber optic cable.