CN2485663Y

CN2485663Y - Multi-core indoor optical laid fiber

Info

Publication number: CN2485663Y
Application number: CN 01240141
Authority: CN
Inventors: 王英明; 余次龙; 王世颖; 彭超
Original assignee: Fiberhome Telecommunication Technologies Co Ltd
Current assignee: Fiberhome Telecommunication Technologies Co Ltd
Priority date: 2001-05-24
Filing date: 2001-05-24
Publication date: 2002-04-10
Anticipated expiration: 2011-05-24

Abstract

The utility model relates to a multi-core indoor optical cable, comprising an optical fiber arranged in the central part of the optical cable and an inflaming retarding jacket coating the outside. The utility model is difference from the prior product in that the optical fiber is coated with a layer of polyester type and a non-metal strengthener is arranged between the polyester type inner jacket and the inflaming retarding jacket. The utility model not only has a simpler structure and relatively better inflaming retarding performance, but also has great anti-pressure and drag-resisting performance and less contractility, and the utility model can effectively avoid the fiber in the cable to be stressed and reduce the attenuation, thus ensuring great optical transmission performance to the fiber.

Description

Multicore is counted inside cable

The utility model relates to a kind of multicore that is used for the room light fiber communication and counts inside cable, relates to the ectonexine structure of this optical cable particularly.

Inside cable mainly lays in the building and is used for the optical information conduction.Existing inside cable structure is comparatively simple, constitute by bag optical fiber and non-metal reinforcement member in the fire retardant jacket of individual layer, because the shrinkability of fire retardant jacket material is big, resistance to compression, tensile property are poor, thereby adopt the inside cable of this structure, tend to make the optic fibre force in the sheath and the decay that causes optical transmission performance.Also the someone proposes to substitute inside cable with the outdoor optical cable structure, but tangible deficiency is also arranged, and first structure is comparatively complicated, the cost of manufacture height; The secondth, pliability is poor, is not easy to lay indoor.

The purpose of this utility model is the deficiency that exists at above-mentioned prior art and provides a kind of structure multicore comparatively simple, that can improve optic fibre force state in the cable to count inside cable.

The purpose of this utility model is realized by following technical scheme: include the optical fiber 1 that is located at the cable core middle part and be coated on outermost fire retardant jacket 5, its difference is to be surrounded by one deck polyesters inner sheath 3 outside optical fiber, be provided with non-metal reinforcement member 4 between polyesters inner sheath and fire retardant jacket.

Good effect of the present utility model is: 1, between outer protective sleeve and optical fiber, set up one deck polyesters inner sheath and non-metal reinforcement member, and relative outdoor optical cable, its structure is still comparatively simple, and cost of manufacture is also lower; 2, because polyester material has higher elastic feel quantity, and shrinkability is little, the intensity height, with it as sheath, on the one hand the resistance to compression of optical cable, tensile property are strengthened greatly, on the other hand because its contraction coefficient is little, and telescopic variation is little during temperature variation, with it as the outer ground floor sheath of optical fiber, optical fiber and fire retardant jacket are kept apart, can effectively avoid optic fibre force in the cable, reduce decay, guarantee that optical fiber has the good optical transmission performance; 3, still maintain flame retardant sheath layer at outermost layer, make inside cable possess stronger anti-burning performance.

Fig. 1 is the radial section figure of first embodiment of the utility model.

Fig. 2 is the radial section figure of second embodiment of the utility model.

Fig. 3 is the amplification profile of optical fiber in second enforcement of the utility model.

Further specify embodiment of the present utility model below in conjunction with accompanying drawing.

First embodiment as shown in Figure 1, be a kind of optical fibre band optical cable, the described optical fiber 1 that is located in the cable core is the fibre ribbon of parallel construction, the fibre core number of fibre ribbon can be the 2-12 fibre core, fibre ribbon can superimposedly up and down be provided with many, fibre ribbon is surrounded by one deck polyesters inner sheath 3 outward, be provided with water-blocking material 2 in the polyesters sheath, water-blocking material can be water-proofing powder or other the filling material that blocks water, fibre ribbon is S in inner sheath or SZ strand type is laid, be equipped with non-metal reinforcement member 4 outside the polyesters inner sheath, non-metal reinforcement member is made of aramid yarn or fiberglass reinforcement, coats fire retardant jacket 5 outside aramid yarn or fiberglass reinforcement again.

Second embodiment of the utility model is shown in Fig. 2,3, and the main difference of it and first embodiment is that described optical fiber 1 is tight cover or semi-tight sleeve optical fiber, and tightly cover or semi-tight sleeve optical fiber pack tightly cover or semi-tight sleeve 7 and constitute by bare fibre 6 is outer, as shown in Figure 3.

Claims

1, a kind of multicore is counted inside cable, include the optical fiber (1) that is located at the cable core middle part and be coated on outermost fire retardant jacket (5), it is characterized in that outside optical fiber, being surrounded by one deck polyesters inner sheath (3), between polyesters inner sheath and fire retardant jacket, be provided with non-metal reinforcement member (4).

2, count inside cable by the described multicore of claim 1, it is characterized in that the described optical fiber (1) that is located in the cable core is the fibre ribbon of parallel construction (1).

3, count inside cable by the described multicore of claim 2, the fibre core number that it is characterized in that fibre ribbon is the 2-12 fibre core, and fibre ribbon can superimposedly up and down be provided with many.

4, count inside cable by the described multicore of claim 1, it is characterized in that non-metal reinforcement member (4) is made of aramid yarn or fiberglass reinforcement.

5, count inside cable by the described multicore of claim 1, it is characterized in that described optical fiber (1) is tight cover or semi-tight sleeve optical fiber.

6, count inside cable by claim 2 or 5 described multicores, it is characterized in that being provided with in the described polyesters sheath water-blocking material (2).