Fiber optic cables and assemblies and the performance thereof

• US 7,668,427 B2
• Filed: 05/30/2008
• Issued: 02/23/2010
• Est. Priority Date: 12/13/2006
• Status: Active Grant

• Current Assignee: Corning Optical Communications LLC (Corning Incorporated)
• Original Assignee: Corning Cable Systems LLC (Corning Incorporated)
• Inventors: Register, James A.
• Primary Examiner(s): KIANNI, KAVEH C
• Application Number:
  US12/156,162
• Publication Number:
  US 20080273846A1
• Time in Patent Office: 634 Days
• Field of Search: 385/102, 385/103, 385/104
• US Class Current: 385/102
• CPC Class Codes: G02B 6/02357 Property of longitudinal structures or background material varies radially and/or azimuthally in the cladding, e.g. size, spacing, periodicity, shape, refractive index, graded index, quasiperiodic, quasicrystals
• CPC Class Codes: G02B 6/02366 Single ring of structures, e.g. "air clad"
• CPC Class Codes: G02B 6/4402 with one single optical waveguide G02B6/4429, G02B6/4439, G02B6/4479 take precedence
• CPC Class Codes: G02B 6/4432 with fibre reinforcements

Abstract

A fiber optic cable having at least one optical fiber such as a microstructured bend performance optical fiber disposed within a protective covering. The protective covering is highly flexible and the fiber optic cable has extremely low delta attenuation when aggressively bent compared with the conventional fiber optic cable designs. By way of example, the delta attenuation of one fiber optic cable design is about 0.33 dB or less when wrapped 3 turns about a 7.5 millimeter mandrel at a reference wavelength of 1625 nanometers. Other variations of the present invention include a connector attached to the fiber optic cable.

Claims

1. A fiber optic cable, comprising:

at least one optical fiber, the at least one optical fiber being a microstructured bend performance optical fiber; and

a protective covering, the protective covering being highly flexible and the fiber optic cable has a delta attenuation of about 0.33 dB or less when wrapped 3 turns about a 7.5 millimeter diameter mandrel at a reference wavelength of 1625 nanometers, wherein

the fiber optic cable is flame retardant.

2. The fiber optic cable of claim 1, the fiber optic cable having a delta attenuation of about 0.1 dB or less for a corner bend test with a load of 1 kilogram and a reference wavelength of 1625 nanometers.

3. The fiber optic cable of claim 2, further comprising at least one strength member, wherein the protective covering is coupled about the at least one strength member for inhibiting buckling of the at least one optical fiber therein.

4. The fiber optic cable of claim 2, wherein the protective covering includes a buffer layer and a jacket.

5. The fiber optic cable of claim 2, wherein the fiber optic cable has a delta attenuation of about 0.22 dB or less for a corner bend test with a load of 10 kilogram at a reference wavelength of 1625 nanometers.

6. The fiber optic cable of claim 1, the at least one optical fiber having a buffer layer thereon.

7. The fiber optic cable of claim 1, wherein the protective covering includes a buffer layer and a jacket.

8. The fiber optic cable of claim 1, further including a connector attached to the fiber optic cable.

9. The fiber optic cable of claim 1, wherein the fiber optic cable has a delta attenuation of about 0.22 dB or less for a corner bend test with a load of 10 kilogram at a reference wavelength of 1625 nanometers.

10. The fiber optic cable of claim 1, further comprising at least one strength member, wherein the protective covering is coupled about the at least one strength member for inhibiting buckling of the at least one optical fiber therein.

11. A fiber optic cable, comprising:

at least one optical fiber, the at least one optical fiber being a microstructured bend performance optical fiber; and

a protective covering, the protective covering being highly flexible and the fiber optic cable has a delta attenuation of about 0.33 dB or less when wrapped 3 turns about a 7.5 millimeter diameter mandrel at a reference wavelength of 1625 nanometers,

wherein the protective covering has an ultimate elongation of about 500% or more measured according to DIN 53504.

12. The fiber optic cable of claim 11, the fiber optic cable having a delta attenuation of about 0.1 dB or less for a corner bend test with a load of 1 kilogram and a reference wavelength of 1625 nanometers.

13. The fiber optic cable of claim 11, further comprising at least one strength member, wherein the protective covering is coupled about the at least one strength member for inhibiting buckling of the at least one optical fiber therein.

14. The fiber optic cable of claim 11, wherein the protective covering includes a buffer layer and a jacket.

15. The fiber optic cable of claim 11, wherein the fiber optic cable has a delta attenuation of about 0.22 dB or less for a corner bend test with a load of 10 kilogram at a reference wavelength of 1625 nanometers.

16. A fiber optic cable, comprising:

at least one optical fiber, the at least one optical fiber being a microstructured bend performance optical fiber; and

a protective covering, the protective covering being highly flexible and the fiber optic cable has a delta attenuation of about 0.33 dB or less when wrapped 3 turns about a 7.5 millimeter diameter mandrel at a reference wavelength of 1625 nanometers,

the protective coating providing a bend control mechanism for inhibiting bending of the at least one optical fiber at a diameter of 5 millimeters or less.

17. The fiber optic cable of claim 16, further comprising at least one strength member, wherein the protective covering is coupled about the at least one strength member for inhibiting buckling of the at least one optical fiber therein.

18. The fiber optic cable of claim 16, wherein the protective covering includes a buffer layer and a jacket.

19. The fiber optic cable of claim 16, wherein the fiber optic cable has a delta attenuation of about 0.22 dB or less for a corner bend test with a load of 10 kilogram at a reference wavelength of 1625 nanometers.

20. A fiber optic cable, comprising:

at least one optical fiber, the at least one optical fiber being a microstructured bend performance optical fiber;

a protective covering, the protective covering being highly flexible and the fiber optic cable has a delta attenuation of about 0.33 dB or less when wrapped 3 turns about a 7.5 millimeter diameter mandrel at a reference wavelength of 1625 nanometers; and

at least one strength member, wherein the protective covering is coupled about the at least one strength member for inhibiting buckling of the at least one optical fiber therein.

21. The fiber optic cable of claim 20, further comprising at least one strength member, wherein the protective covering is coupled about the at least one strength member for inhibiting buckling of the at least one optical fiber therein.

22. The fiber optic cable of claim 20, wherein the protective covering includes a buffer layer and a jacket.

23. The fiber optic cable of claim 20, wherein the fiber optic cable has a delta attenuation of about 0.22 dB or less for a corner bend test with a load of 10 kilogram at a reference wavelength of 1625 nanometers.

24. A fiber optic cable, comprising:

at least one optical fiber, the at least one optical fiber being a microstructured bend performance optical fiber; and

a protective covering, the protective covering being highly flexible and the fiber optic cable has a delta attenuation of about 0.33 dB or less when wrapped 3 turns about a 7.5 millimeter diameter mandrel at a reference wavelength of 1625 nanometers, wherein

the at least one microstructured optical fiber has a core region surrounded by a cladding region, the cladding region includes an annular hole-containing region having non-periodically disposed holes, the annular hole-containing region being spaced apart from the core region, and

wherein greater than about 95 percent of the holes in the at least one microstructured optical fiber have a mean hole size of 775 nanometers or less.