Optical-electrical hybrid transmission cable

1. An optical-electrical hybrid transmission cable, comprising:

an insulative layer;

a shielding layer located on an inner side of the insulative layer;

a pair of signal wires disposed in the shielding layer and twisted together;

a power wire and a grounding wire disposed in the shielding layer and arranged side by side;

two bare optical fibers disposed in the shielding layer and spaced apart from each other; and

a plurality of fillers disposed in the shielding layer and arranged in a discrete manner.

2. The optical-electrical hybrid transmission cable as recited in claim 1 , wherein the shielding layer comprises a metallic braided layer disposed on an inner side of the insulative layer and a metallic mylar layer disposed on an inner side of the metallic braided layer.

3. The optical-electrical hybrid transmission cable as recited in claim 2 wherein the two bare optical fibers, the pair of signal wires, the power wire and the grounding wire are arranged along a circumferential direction.

4. The optical-electrical hybrid transmission cable as recited in claim 2 , wherein the pair of signal wires are unshielded twisted paired wires and used for transmitting differential signal.

5. The optical-electrical hybrid transmission cable as recited in claim 2 , wherein the two bare fibers are used for optical signal transmission, the pair of signal wires the power wire and the grounding wire are used for electrical signal transmission.

6. The optical-electrical hybrid transmission cable as recited in claim 1 , wherein each filler is a strand Kevlar fibers.

7. The optical-electrical hybrid transmission cable as recited in claim 1 , wherein the two bare optical fibers are spaced apart from each other by the pair of signal wires, the power wire and the grounding wire.

8. A hybrid cable, comprising:

an insulative layer;

a metallic braided layer disposed on an inner side of the insulative layer;

a metallic mylar layer disposed on an inner side of the metallic braided layer;

two bare optical fibers, a pair of signal wires, a power wire and a grounding wire disposed in the metallic mylar layer and arranged along a circumferential direction; and

a plurality of bare optical fibers disposed in the metallic mylar layer and arranged in a discrete manner.

9. The hybrid cable as recited in claim 8 , wherein the power wire and the grounding wire are arranged side by side.

10. The hybrid cable as recited in claim 8 , wherein the pair of signal wires are twisted together.

11. A hybrid cable comprising:

an inner segment and an outer segment coaxially radially sandwiching a middle segment therebetween;

the outer segment being of an insulative layer;

the middle segment being of at least one metallic layer for shielding; and

the inner segment including a plurality of bare optical fibers, a plurality of signal wires and a plurality of power and ground wires commonly surrounding a filler.

12. The hybrid cable as claimed in claim 11 , wherein the inner segment is essentially symmetrically arranged with regard to an imaginary centerline.

13. The hybrid cable as claimed in claim 12 , wherein said signal wires, and said power and ground wires are respectively symmetrically arranged by two sides of said imaginary centerline while the optical cable is of a single piece aligned with said centerline.

14. The hybrid cable as claimed in claim 11 , wherein the filler further occupies space between the metallic layer and said signal wires and said power and ground wires circumferentially.