CN110908051B

CN110908051B - Optical cable

Info

Publication number: CN110908051B
Application number: CN201911145762.XA
Authority: CN
Inventors: 王醒东; 何园园; 郝小龙
Original assignee: Hangzhou Futong Communication Technology Co Ltd
Current assignee: SHENZHEN XIN'AOKE CABLE Co.,Ltd.
Priority date: 2019-11-21
Filing date: 2019-11-21
Publication date: 2021-07-20
Anticipated expiration: 2039-11-21
Also published as: CN110908051A

Abstract

The invention relates to the field of optical cables, in particular to an optical cable. It includes: the optical fiber layer and a protective layer which is coated outside the optical fiber layer and is tightly attached to the optical fiber layer; the optical fiber layer consists of an optical fiber wire group and a splayed elastic sleeve, and the protective layer is attached to and wraps the splayed elastic sleeve; through holes along the axial direction of the optical cable are formed in both ends of the splayed elastic sleeve, and optical fiber line groups are laid in the through holes along the axial direction of the optical cable; the optical fiber line group consists of an elastic line, a slingshot line and an optical fiber; the elastic wire is arranged along the axial direction of the optical cable, and the slingshot wire and the optical fiber are fixedly wound on the outer side of the elastic wire. Compared with the prior art, the invention has good bending resistance, can keep the performance of the optical fiber after being bent, avoids the optical fiber from being bent at a bent angle, and has restoring force to promote the optical fiber to be restored to a straight state after being bent; the optical cable has good pressure resistance, can effectively disperse the longitudinal pressure applied on the optical cable, and avoids the optical fiber from being damaged.

Description

Optical cable

Technical Field

The invention relates to the field of optical cables, in particular to an optical cable.

Background

Optical fiber cables (optical fiber cables) are manufactured to meet optical, mechanical, or environmental performance specifications and are telecommunication cable assemblies that utilize one or more optical fibers disposed in a surrounding jacket as the transmission medium and that may be used individually or in groups.

Generally, an optical cable generally includes an optical fiber, a plastic protective sleeve, and a plastic sheath, and now, in order to improve environmental adaptability of the optical cable, special layer structures such as a flame retardant layer and a waterproof layer are further formed, so that the optical cable can be used in different environments.

However, the existing optical cable has certain use defects. Most of the existing optical cables are round optical cables with round sections, and the round optical cables have the problems of difficult arrangement, high fixing difficulty, easy rolling and winding and the like, so that flat optical cables are derived. However, the flat optical cable has a special structure, and solves the problems of the round optical cable, but has problems of poor pressure resistance, poor bending resistance, easy bending, and easy damage to the optical fiber due to bending.

Disclosure of Invention

The invention provides an optical cable, aiming at solving the problems that the existing round optical cable is large in arrangement and fixing difficulty and easy to roll and wind, and the flat optical cable is poor in pressure resistance and bending resistance, so that an optical fiber is easy to damage, the optical transmission performance is influenced and the like. The invention aims to: the bending resistance of the flat optical cable is improved, so that the flat optical cable does not bend at a folding angle in the bending process, and the optical fiber is prevented from being damaged; the pressure resistance of the flat optical cable is improved, so that the flat optical cable can well protect the optical fiber when being subjected to longitudinal pressure, and the damage to the optical fiber is further avoided.

In order to achieve the purpose, the invention adopts the following technical scheme.

An optical cable, comprising: the optical fiber layer and a protective layer which is coated outside the optical fiber layer and is tightly attached to the optical fiber layer; the optical fiber layer consists of an optical fiber wire group and a splayed elastic sleeve, and the protective layer is attached to and wraps the splayed elastic sleeve; through holes arranged along the axial direction of the optical cable are formed in both ends of the splayed elastic sleeve, and optical fiber line groups are laid in the through holes in both ends along the axial direction of the optical cable; the optical fiber line group consists of an elastic line, a slingshot line and an optical fiber; the elastic wire is arranged along the axial direction of the optical cable, and the slingshot wire and the optical fiber are fixedly wound on the outer side of the elastic wire.

Preferably, the slingshot wires and the optical fibers in the optical fiber wire group are equal in number, are alternately arranged and are wound outside the elastic wires in close contact.

Preferably, the slingshot wires and the outer sides of the optical fibers are further coated with moisture-proof skins; the outer surface of the slingshot wire is coated with damping rubber.

Preferably, a resin strip is arranged in the protective layer; the resin strips are two and are symmetrically arranged at the lower ends of the splayed elastic sleeves by taking the splayed elastic sleeves as centers.

Preferably, the resin strips are arched, and the arched convex surfaces of the two resin strips are opposite and face towards the splayed elastic sleeve.

Preferably, a flame retardant layer is arranged outside the protective layer.

Compared with the prior art, the invention has the beneficial effects that: the optical fiber bending device has good bending resistance, can keep the performance of the optical fiber after bending, avoids the optical fiber from being bent at a bending angle, and has restoring force to promote the optical fiber to be restored to a straight state after bending; the optical cable has good pressure resistance, can effectively disperse the longitudinal pressure applied on the optical cable, and avoids the optical fiber from being damaged.

Drawings

FIG. 1 is a schematic cross-sectional view of a fiber optic cable according to the present invention.

FIG. 2 is a schematic axial half-section view of an optical fiber cable assembly according to the present invention.

Fig. 3 is a cross-sectional view of the slingshot wire of the present invention.

FIG. 4 is a schematic cross-sectional view of a cable of the present invention under compression.

In the figure: 1 protective layer, 2 splayed elastic sleeves, 21 through holes, 3 optical fibers, 4 slingshot wires, 41 damping rubber, 5 elastic wires, 6 dampproof rubber, 7 resin strips and 8 flame-retardant layers.

Detailed Description

The invention is described in further detail below with reference to specific embodiments and the attached drawing figures. Those skilled in the art will be able to implement the invention based on these teachings. Moreover, the embodiments of the present invention described in the following description are generally only some embodiments of the present invention, and not all embodiments. Therefore, all other embodiments obtained by a person of ordinary skill in the art based on the embodiments of the present invention without any creative effort shall fall within the protection scope of the present invention.

Unless otherwise specified, the raw materials used in the examples of the present invention are all commercially available or available to those skilled in the art; unless otherwise specified, the methods used in the examples of the present invention are all those known to those skilled in the art.

Examples

An optical cable as shown in fig. 1 to 4, which has an oblong cross-section, is described with reference to the optical cable shown in fig. 1, i.e., it can be divided into a shape that both left and right ends are semicircular and the middle is rectangular, and the stress on both sides of the oblong flat optical cable is more easily transmitted and concentrated to the rectangular portion in the middle of the optical cable than that on the rectangular or other conventional flat optical cables, so that the stress on the semicircular portions on both ends of the optical cable is reduced, and the oblong flat optical cable is more easily extended to both left and right sides under compression, particularly compared to the conventional rectangular cross-section flat optical cable. The optical cable specifically includes:

the optical fiber protection device comprises an optical fiber layer and a protection layer 1, wherein the protection layer 1 is tightly wrapped outside the optical fiber layer to protect the optical fiber layer.

Protective layer 1 is formed for the elastic material solidification, adopt epoxy/carborundum combined material preparation in this embodiment, it has good elasticity and toughness, and possess the ability of bearing higher temperature, high-elastic high tenacity material makes the optical cable lay more convenient, and the elasticity of material itself also impels its restoration after buckling, certain bending resistance has tentatively produced, in addition, high-elastic high tenacity material is compared in the conventional optical cable crust that only has higher toughness, it is more difficult for appearing dog-ear bending when buckling, replace conventional dog-ear bending form with the mode that the arc was buckled, can avoid inside line body to produce dog-ear bending and influence the optical cable performance.

The optical fiber layer comprises an optical fiber line group and a splayed elastic sleeve 2, the splayed elastic sleeve 2 is in a horizontal 8 shape as shown in figure 1, the outer side of the splayed elastic sleeve is fixedly attached to the protective layer 1, through holes 21 along the axial direction of the optical cable are formed in the left end and the right end of the inner part of the splayed elastic sleeve, the optical fiber line group penetrates through the through holes 21 and is laid along the axial direction of the optical cable, the optical fiber line group is arranged in the through holes 21 at the two ends of the splayed elastic sleeve 2, the embodiment is described by laying one optical fiber line group in each through hole 21, and actually, a plurality of optical fiber line groups can be laid in the through holes 21 at the two ends of the splayed elastic sleeve 2.

The optical fiber line group is formed by alternately arranging the optical fibers 3 and the slingshot lines 4 with equal quantity, closely attaching and winding the optical fibers and the slingshot lines outside the elastic lines 5.

Inert gases such as nitrogen or argon can be filled into the through holes 21 of the splayed elastic sleeve 2, so that gas protection is further realized, the aging of the optical fiber wire group is delayed, and a certain degree of gas buffering effect is realized.

Wherein, the elastic thread 5 is a linear thread with elastic toughness, and is laid along the axial direction of the optical cable as the main axis of the optical fiber group, and the material of the elastic thread 5 in this embodiment adopts the epoxy resin/silicon carbide composite material which is the same as the material of the protective layer 1, the slingshot thread 4 is a spiral thread with strong flexibility and bending resistance, which has certain memory elasticity and has the excellent characteristic of basically not forming a break angle after bending, the optical fiber 3 is tightly attached and wound around the outer end of the elastic thread 5 as the main axis in a spiral arrangement way and the equal thick slingshot thread 4, the characteristic of the slingshot thread 4 is utilized to lay and guide the optical fiber 3 and can effectively avoid the optical fiber 3 from forming the break angle bending which is easy to cause the damage of the optical transmission performance, in addition, the cooperation of the slingshot thread 4 and the elastic thread 5 can also make the optical fiber group quickly recover to be straight after bending, after the optical fiber line set is bent, the elastic force generated by the slingshot line 4 and the elastic line 5 can be kept and continuously exist for a long time, and when the external force applied to the optical fiber line set disappears or is weakened to be small enough, the optical fiber line set can spontaneously recover to a straight state.

The outer sides of the optical fiber 3 and the slingshot wire 4 are further coated with a moisture-proof skin 6 for further performing moisture-proof protection on the optical fiber set, and the moisture-proof skin 6 is formed by curing waterproof resin.

Performing bending test on the optical fiber line group, firstly preparing ten optical fiber line groups as shown in figures 1 to 3, wherein three optical fibers 3 and three slingshot lines 4 are tightly attached and wound outside an elastic line 5, a dampproof leather 6 is coated outside the optical fibers 3 and the slingshot lines 4, the length of the line body to be tested is 50cm, a measuring point is taken at intervals of 10cm, and a mark is made on the dampproof leather 6, namely, each line body to be tested is provided with four measuring points, each line body is subjected to 90-degree bending test and 180-degree bending test twice at the four measuring points, the 90-degree bending test and the 180-degree bending test are performed at intervals, namely, the 90-degree bending test, the 180-degree bending test, the 90-degree bending test and the 180-degree bending test are sequentially performed, wherein five line bodies to be tested are bent for 30min each time, the rest of the line bodies to be tested are bent for 3h on each side, carefully cutting and stripping the dampproof leather 6 at the measuring points after the test is finished, observing the optical fiber 3 and the slingshot line 4, no folding crease is found, proving that the structure of the optical fiber can be kept intact after the optical fiber is continuously bent at a large angle, no crease can be found, meanwhile, the optical fiber is quickly restored to a straight state under the action of the elastic force of the slingshot line 4 and the elastic line 5, further performing an optical fiber transmission test, comparing the optical fiber with the optical fiber 3 which is not subjected to the bending test in an equal specification, and displaying the optical transmission performance of the optical fiber 3 in all bent optical fiber groups according to test results, thereby proving that the optical fiber groups have excellent bending resistance and recovery capability.

The outer surface of the slingshot wire 4 is further sprayed to form a damping rubber sheet 41 so as to improve the combination stability of the slingshot wire 4 and the optical fiber 3.

Still lay two resin strips 7 along the optical cable axial in the protective layer 1, two resin strips 7 use the optical fiber layer to set up as the vertical symmetry in protective layer 1 as the center.

The longitudinal section of the resin strip 7 is arched, the arched convex surfaces of the two resin strips 7 are opposite and face the optical fiber layer, the arched resin strips 7 can effectively disperse the stress of the optical fiber group when the optical cable is longitudinally extruded, as shown in figure 4, when the upper end and the lower end of the optical cable are extruded by longitudinal pressure F1, the arched resin strips 7 are firstly extruded towards the middle part, due to the arrangement of the splayed elastic sleeve 2, the arched resin strips 7 are subjected to arc bending deformation to a certain degree, the left end and the right end of the splayed elastic sleeve 2 and the whole optical cable are pushed away towards two sides along the direction F2 in figure 4 after the deformation, even if the whole optical cable is in an extension posture towards two sides, under the condition, the longitudinal pressure when the whole optical cable is longitudinally pressed can be continuously dispersed and absorbed in the process of transmitting to the optical fiber group, the pressure borne by the optical fiber group is greatly reduced, and finally, more uniform and dispersed pressure is generated on the whole optical cable by the inner wall of the through hole 21 of the splayed elastic sleeve 2, the optical fiber line group is slightly transversely deformed in an oval shape, the longitudinal height of the optical fiber line group is reduced, and under the condition that the longitudinal pressure generated by the outside is continuously increased, the preferential stress and the direct stress of the resin strip 7 are kept, so that the optical fiber line group cannot become a direct stress object. In the practical use process, the pressure which is most easily applied to the flat optical cable is from the longitudinal direction, and the arched resin strips 7 are arranged, so that the influence on the optical fiber line group is reduced when the optical cable is applied with the longitudinal pressure, the optical fiber line group is ensured to be intact, and the pressure resistance of the optical cable is greatly improved.

The thickness of the resin strip 7 is larger than or equal to the radius of the optical fiber line group, so that a better pressure-resistant effect is generated.

Further, the exterior of the protective layer 1 is coated with a light-cured flame-retardant resin, and is cured by ultraviolet irradiation to form a flame-retardant layer 8.

Claims

1. An optical cable, comprising: the optical fiber layer and a protective layer which is coated outside the optical fiber layer and is tightly attached to the optical fiber layer; the optical fiber layer consists of an optical fiber wire group and a splayed elastic sleeve, and the protective layer is attached to and wraps the splayed elastic sleeve; through holes arranged along the axial direction of the optical cable are formed in both ends of the splayed elastic sleeve, and optical fiber line groups are laid in the through holes in both ends along the axial direction of the optical cable; the optical fiber line group consists of an elastic line, a slingshot line and an optical fiber; the elastic wire is arranged along the axial direction of the optical cable, and the slingshot wire and the optical fiber are fixedly wound on the outer side of the elastic wire; the protective layer is made of epoxy resin/silicon carbide composite material; the slingshot wires and the optical fibers in the optical fiber wire group are equal in number, are alternately arranged and are tightly wound outside the elastic wires in a contacting manner; the outer sides of the slingshot wires and the optical fibers are also coated with moisture-proof skins; the outer surface of the slingshot wire is coated with damping rubber; a resin strip is arranged in the protective layer; the two resin strips are symmetrically arranged at the lower end of the splayed elastic sleeve by taking the splayed elastic sleeve as a center; the resin strips are arched, and the arched convex surfaces of the two resin strips are opposite and face the splayed elastic sleeve; the slingshot wire is a spiral wire body with strong flexibility and bending resistance, and has certain memory elasticity.

2. An optical cable according to claim 1, wherein the protective layer is provided with a flame retardant layer on the outside.