Dual-layer sheath for an optical fiber cable
View Patent ↗The present invention relates to a flexible high density optical fiber cable ( 100 ) having no central strength member. Particularly, the optical fiber cable ( 100 ) comprises a core having a plurality of bundled optical fiber ribbons ( 104 ), a inner layer ( 108 ), a outer layer ( 112 ) and a continuous strength layer ( 110 ) sandwiched between the inner layer ( 108 ) and the outer layer ( 112 ). The continuous strength layer ( 110 ) is a stiff strength member providing flexibility and strength to the optical fiber cable ( 100 ). The proposed structure of the optical fiber cable ( 100 ) enables the optical fiber cable ( 100 ) to have an optimized blowing performance and anti-buckling characteristics.
1. A optical fiber cable having a high fiber count, wherein the optical fiber cable comprising:
an outer layer concentrically encapsulating a continuous strength layer;
an inner layer concentrically encapsulating a plurality of bundled optical fiber ribbons; and
the continuous strength layer sandwiched between the outer layer and the inner layer wherein the continuous strength layer is made of a glass yarns or a glass roving yarns;
wherein the optical fiber cable is a flexible high density optical fiber cable.
2. The optical fiber cable as claimed in claim 1 , wherein the inner layer is made from a material with a melt flow index (MFI) between 0.3 to 2 g/l 0 min.
3. The optical fiber cable as claimed in claim 2 , wherein the inner layer is a polypropylene layer.
4. The optical fiber cable as claimed in claim 1 , wherein the continuous strength layer is helically wrapped around the inner layer.
5. The optical fiber cable as claimed in claim 1 , wherein the outer layer is made from a material with a melt flow index (MFI) 0.3 g/l 0 min or above.
6. The optical fiber cable as claimed in claim 1 , wherein the optical fiber cable has a crush resistance of more than 2000N/100 mm.
7. The optical fiber cable as claimed in claim 5 , wherein the outer layer is a high density poly-ethylene (HOPE) layer.
8. The optical fiber cable as claimed in claim 1 , wherein the optical fiber cable comprises a core with the plurality of bundled optical fiber ribbons.
9. The optical fiber cable as claimed in claim 1 , wherein the plurality of bundled optical fiber ribbons is a plurality of bundled intermittently bonded optical fiber ribbons.
10. The optical fiber cable as claimed in claim 9 , wherein the plurality of bundled optical fiber ribbons is any of a bendable optical fiber ribbons or a rollable optical fiber ribbons.
11. The optical fiber cable as claimed in claim 10 , wherein each bundled optical fiber ribbons of the plurality of bundled optical fiber ribbons have optical fiber ribbons in a range of 6 to 24.
12. The optical fiber cable as claimed in claim 1 , wherein the high fiber count accommodates 288 optical fibers, 1728 optical fibers or 6912 optical fibers.
13. The optical fiber cable as claimed in claim 12 , wherein the optical fiber cable has a diameter of 9.2 mm for 288 optical fiber count.
14. The optical fiber cable as claimed in claim 12 , wherein the optical fiber cable has a diameter of 26.2 mm for 1728 optical fiber count.
15. The optical fiber cable as claimed in claim 12 , wherein the optical fiber cable has a diameter of 36.6 mm for 6912 optical fiber count.
16. The optical fiber cable as claimed in claim 1 , wherein the plurality of optical fiber ribbons is bundled with a binder to form the plurality of bundled optical fiber ribbons.
17. The optical fiber cable as claimed in claim 1 , wherein the inner layer and outer layer has a thickness of 0.6 mm to 1.5 mm.
18. The optical fiber cable as claimed in claim 1 , wherein the continuous strength layer has a thickness of 0.3 mm.