Optical fiber and power line composite cable

• US 9,099,216 B2
• Filed: 03/25/2014
• Issued: 08/04/2015
• Est. Priority Date: 12/30/2013
• Status: Active Grant

• Current Assignee: LS Cable And System Limited (LS Cable)
• Original Assignee: LS Cable And System Limited (LS Cable)
• Inventors: Baeck, Jong-Seb, Jung, In-Ha, Jin, Sung-Su
• Primary Examiner(s): Lepisto, Ryan
• Assistant Examiner(s): ANDERSON, GUY G
• Application Number:
  US14/224,789
• Publication Number:
  US 20150187463A1
• Time in Patent Office: 497 Days
• Field of Search: 385100-101, 385/107, 385/110, 385/112
• US Class Current: 1/1
• CPC Class Codes: G02B 6/44 Mechanical structures for providing tensile strength and external protection for fibres, e.g. optical transmission cables cables incorporating electric conductors and optical fibres where features relating to the optical fibres are not of interest H01B11/22
• CPC Class Codes: G02B 6/4429 Means specially adapted for strengthening or protecting the cables
• CPC Class Codes: G02B 6/443 Protective covering
• CPC Class Codes: G02B 6/4435 Corrugated mantle
• CPC Class Codes: H01B 9/005 including optical transmission elements

Abstract

The present invention relates to an optical fiber and power line composite cable comprising a cable core comprising at least one power line unit including a conductor and an insulator surrounding the conductor and at least one optical fiber unit including an optical fiber and a tube accommodating the optical fiber, a protective metal layer surrounding the cable core, and having corrugations including corrugation peaks and corrugation valleys that are alternately formed and an outer coating layer surrounding the protective metal layer, wherein a relation shown by the following formula is satisfied D_i<D_c≦D_o assuming an external diameter of the cable core as D_c, an internal diameter of the corrugation peak as D_o, and an internal diameter of the corrugation valley as D_i.

Claims

1. An optical fiber and power line composite cable installed between base station equipment and an antenna in a mobile telecommunication base station to transmit a mobile communication signal and power, the optical fiber and power line composite cable comprising:

a cable core comprising;

at least one power line unit including a conductor and an insulator surrounding the conductor; and

at least one optical fiber unit including an optical fiber and a tube accommodating the optical fiber;

a protective metal layer surrounding the cable core, and having corrugations including corrugation peaks and corrugation valleys that are alternately formed; and

an outer coating layer surrounding the protective metal layer,

wherein a relation shown by the following formula (1) is satisfied;

D_i<

D_c≦

D_o 

 

(1)

assuming an external diameter of the cable core as D_c, an internal diameter of the corrugation peak as D_o, and an internal diameter of the corrugation valley as D_i.

2. The optical fiber and power line composite cable as claimed in claim 1, wherein a relation shown by the following formula (2) is further satisfied:

D_c−

2T_f<

D_i 

 

(2)

assuming a thickness of the tube of the optical fiber unit as T_f.

3. The optical fiber and power line composite cable as claimed in claim 1, wherein a relation shown by the following formula (3) is further satisfied:

D_c−

2T_p<

D_i 

 

(3)

assuming a thickness of the insulator of the at least one power line unit as T_p.

4. The optical fiber and power line composite cable as claimed in claim 3, wherein an external diameter of the at least one optical fiber unit is formed to be less than an external diameter of the at least one power line unit.

5. The optical fiber and power line composite cable as claimed in claim 1, wherein the cable core further comprises a non-woven fabric tape surrounding the at least one power line unit and the at least one optical fiber unit.

6. The optical fiber and power line composite cable as claimed in claim 1, wherein the cable core further comprises a central string in a central region.

7. The optical fiber and power line composite cable as claimed in claim 1, further comprising filler filled in an empty space of the cable core.

8. An optical fiber and power line composite cable installed between base station equipment and an antenna in a mobile telecommunication base station to transmit a mobile communication signal and power, the optical fiber and power line composite cable comprising:

a cable core comprising;

a plurality of power line units each including a conductor and an insulator surrounding the conductor; and

a plurality of optical fiber units each including an optical fiber and a tube accommodating the optical fiber,

wherein the plurality of optical fiber units are disposed in the cable core, and the plurality of power line units are disposed along the outside of the plurality of optical fiber units;

a protective metal layer surrounding the cable core, and having corrugations including corrugation peaks and corrugation valleys that are alternately formed; and

an outer coating layer surrounding the protective metal layer,

wherein a relation shown by the following formula (1) is satisfied;

D_i<

D_c≦

D_o 

 

(1)

assuming an external diameter of the cable core as D_c, an internal diameter of the corrugation peak as D_o, and an internal diameter of the corrugation valley as D_i.

9. The optical fiber and power line composite cable as claimed in claim 8, wherein a relation shown by the following formula (3) is further satisfied:

D_c−

2T_p<

D_i 

 

(3)

assuming a thickness of the insulator of the at least one power line unit as T_p.

10. The optical fiber and power line composite cable as claimed in claim 8, further comprising a protective layer provided between the plurality of optical fiber units and the plurality of power line units, and surrounding the plurality of optical fiber units.

11. The optical fiber and power line composite cable as claimed in claim 8, wherein the cable core further comprises a non-woven fabric tape surrounding the plurality of power line units and the plurality of optical fiber units.

12. The optical fiber and power line composite cable as claimed in claim 8, wherein the cable core further comprises a central string in a central region.

13. The optical fiber and power line composite cable as claimed in claim 8, further comprising filler filled in an empty space of the cable core.

14. An optical fiber and power line composite cable installed between base station equipment and an antenna in a mobile telecommunication base station to transmit a mobile communication signal and power, the optical fiber and power line composite cable comprising:

a cable core comprising;

a central string;

a plurality of power line units each including a conductor and an insulator surrounding the conductor; and

a plurality of optical fiber units each including an optical fiber and a tube accommodating the optical fiber,

wherein the plurality of optical fiber units and the plurality of power line units are disposed along an outer circumference of the central string;

a protective metal layer surrounding the cable core, and having corrugations including corrugation peaks and corrugation valleys that are alternately formed; and

an outer coating layer surrounding the protective metal layer,

wherein a relation shown by the following formula (1) is satisfied;

D_i<

D_c≦

D_o 

 

(1)

assuming an external diameter of the cable core as D_c, an internal diameter of the corrugation peak as D_o, and an internal diameter of the corrugation valley as D_i.

15. The optical fiber and power line composite cable as claimed in claim 14,

wherein a relation shown by the following formulas (2) and (3) are further satisfied:

D_c−

2T_f<

D_i 

 

(2)

D_c−

2T_p<

D_i 

 

(3)

assuming a thickness of the insulator of the at least one power line unit as T_p and a thickness of the tube of the optical fiber unit as T_f.

16. The optical fiber and power line composite cable as claimed in claim 14, wherein external diameters of the plurality of optical fiber units are formed to be less than external diameters of the plurality of power line units.

17. The optical fiber and power line composite cable as claimed in claim 16, wherein a relation shown by the following formula (4) is further satisfied:

D_c−

2(D_p−

D_f)<

D_i 

 

(4)

assuming external diameters of the plurality of power line units as D_p and external diameters of the plurality of optical fiber units as D_f.

18. The optical fiber and power line composite cable as claimed in claim 14, further comprising filler filled in an empty space of the cable core.

19. An optical fiber and power line composite cable installed between base station equipment and an antenna in a mobile telecommunication base station to transmit a mobile communication signal and power, the optical fiber and power line composite cable comprising:

a cable core comprising;

at least one power line unit including a conductor and an insulator surrounding the conductor; and

at least one optical fiber unit including an optical fiber and a tube accommodating the optical fiber;

a protective metal layer surrounding an outer circumference of the cable core, and having corrugations including corrugation peaks and corrugation valleys that are alternately formed;

an outer coating layer surrounding the protective metal layer; and

a connection part formed at an end portion of the optical fiber and power line composite cable,

wherein the outer coating layer and the protective metal layer are sequentially removed at the end portion of the optical fiber and power line composite cable where the connection part is formed such that a part of the cable core, an end of the protective metal layer, and an end of the outer coating layer are covered by the connection part,

wherein the connection part includes at least one stepped portion formed on an outer circumference of the connection part and reducing an outer diameter of the connection part where the outer coating layer and the protective metal layer are removed.

20. The optical fiber and power line composite cable as claimed in claim 19, wherein the connection part comprises a shrinkable tube, and

a thickness of the at least one stepped portion on the protective metal layer is equal to or greater than a thickness of the outer coating layer.

21. The optical fiber and power line composite cable as claimed in claim 19, wherein a relation shown by the following formula (1) is satisfied:

D_i<

D_c≦

D_o 

 

(1)

assuming an external diameter of the cable core as D_c, an internal diameter of the corrugation peak as D_o, and an internal diameter of the corrugation valley as D_i.

22. An optical fiber and power line composite cable installed between base station equipment and an antenna in a mobile telecommunication base station to transmit a mobile communication signal and power, the optical fiber and power line composite cable comprising:

a cable core comprising;

at least one power line unit including a conductor and an insulator surrounding the conductor; and

at least one optical fiber unit including an optical fiber and a tube accommodating the optical fiber;

a protective metal layer surrounding the cable core, and having corrugations including corrugation peaks and corrugation valleys that are alternately formed; and

an outer coating layer surrounding the protective metal layer

wherein the at least one power line unit and the at least one optical fiber unit are exposed on at least one end portion of the optical fiber and power line composite cable, and

a waterproof member is provided to guide the at least one power line unit and the at least one optical fiber unit to branch off from the at least one end portion of the optical fiber and power line composite cable, and to prevent foreign substances from penetrating into the optical fiber and power line composite cable.

23. The optical fiber and power line composite cable as claimed in claim 22, wherein the at least one power line unit and the at least one optical fiber unit are fixed with the waterproof member by inserting one end portion of the optical fiber and power line composite cable into a shrinkable tube, heating the waterproof member to a predetermined temperature, disposing a fixing unit between the at least one power line unit and the at least one optical fiber unit, and hardening the shrinkable tube.

24. The optical fiber and power line composite cable as claimed in claim 22, wherein a relation shown by the following formula (1) is satisfied:

D_i<

D_c≦

D_o 

 

(1)

assuming an external diameter of the cable core as D_c, an internal diameter of the corrugation peak as D_o, and an internal diameter of the corrugation valley as D_i.