TWI796154B - Optical cable - Google Patents

Abstract

An optical cable is provided. The optical cable includes an optical cable core, a first steel wire, a second steel wire, a first stripped fiber rope, and a second stripped fiber rope. The optical cable core is composed of a water-stop non-woven fabric overlapped and wrapped with a plurality of optical fiber bundles. The first steel wire and the second steel wire are symmetrically arranged on the optical cable core along a first direction. The first stripped fiber rope and the second stripped fiber rope are symmetrically arranged on the optical cable core along a second direction, and the first direction and the second direction are perpendicular to each other. Each of the plurality of optical fiber bundles includes a first colored ribbon, a second colored ribbon, and a plurality of optical fiber ribbons, and the first colored ribbon and the second colored ribbon are used to fix the plurality of optical fiber ribbons.

Description

fiber optic cable

The present invention relates to an optical cable.

In response to the demand for a large number of optical fibers in high-speed transmission networks, high-core-count optical cables need to have the characteristics of high density and small outer diameter. At present, the common optical cable manufacturing equipment is used to manufacture optical cables with small number of cores (for example, less than 300 cores). hour.

The invention provides an optical cable, which can improve the production efficiency of (high core count) optical cable.

The optical cable of the present invention includes an optical cable core, a first steel wire, a second steel wire, a first stripped fiber rope and a second stripped fiber rope. The optical cable core is composed of multiple optical fiber bundles wrapped with water-stop non-woven fabric. The first steel wire and the second steel wire are symmetrically arranged on the optical cable core along the first direction. The first stripped fiber rope and the second stripped fiber rope are symmetrically arranged on the optical cable core along the second direction, and the first direction and the second direction are perpendicular to each other. Each of the plurality of optical fiber bundles includes a first colored strip, a second colored strip and several optical fiber ribbons, and the first colored strip and the second colored strip are used to fix the several optical fiber ribbons.

FIG. 1 is a schematic diagram of an optical cable according to an embodiment of the present invention. The optical cable of the present invention may include an optical cable core, a steel wire 1a, a steel wire 1b, a stripped fiber rope 2a, a stripped fiber rope 2b, and a covering body 6. In detail, the optical cable core can be formed by overlapping and wrapping a plurality of optical fiber bundles 5 with waterproof non-woven fabric 3 .

The optical cable of the present invention is a dry optical cable (the waterproof non-woven fabric 3 expands when meeting water and can block the rupture point of the covering body 6 to waterproof).

As shown in FIG. 1 , the number of optical fiber bundles 5 is 15, but the present invention is not limited thereto.

The steel wires 1a and 1b are symmetrically arranged in the optical cable core along the direction D2 to serve as tensile bodies (under tension). The steel wire 1a and the steel wire 1b may be anti-corrosion steel wires.

The stripped fiber rope 2a and the stripped fiber rope 2b are symmetrically arranged on the optical cable core along the direction D1, and the direction D2 and the direction D1 are perpendicular to each other.

The covering body 6 is used to cover the optical cable core, the steel wire 1a, the steel wire 1b, the stripped fiber rope 2a, and the stripped fiber rope 2b. The coating body 6 may be coated with a polymer.

The peeling fiber cord 2a and the peeling fiber cord 2b can be used to separate the covering body 6 . Specifically, small protrusions may be marked on the covering body 6 to show the positions of the detached fiber cord 2a and the detached fiber cord 2b. Therefore, when the covering body 6 is to be stripped, the peeling fiber cord 2 a and the stripping fiber cord 2 b can be easily found to avoid damage to the optical fibers (in each optical fiber bundle 5 ) when stripping the covering body 6 . Furthermore, the steel wire 1a and the steel wire 1b can also be found through the direction D1 (perpendicular to the direction D2) when stripping the covering body 6, so that it is easier to find the tensile body and fix it when the optical cable is terminated.

FIG. 2A is a schematic diagram of an optical fiber bundle 5 according to an embodiment of the present invention. As shown in FIG. 2A , each fiber bundle 5 may include a colored strip 51 a , a colored strip 51 b and several optical fiber ribbons 53 , and the colored strips 51 a and colored strips 51 b are used to fix the several optical fiber ribbons 53 .

In this embodiment, the colored strips 51a and colored strips 51b can fix several optical fiber ribbons 53 in an SZ winding manner as shown in FIG. Cause fiber bundle 5 (internal optical fiber) to come off. It is worth noting that no special tool is required to remove the several optical fiber ribbons 53 fixed by SZ winding.

FIG. 2B is a schematic diagram of an optical fiber bundle 5 according to another embodiment of the present invention. Similar to FIG. 2A , each fiber bundle 5 may include a colored strip 51 a , a colored strip 51 b and several pieces of optical fiber ribbons 53 , and the colored strips 51 a and colored strips 51 b are used to fix the several pieces of optical fiber ribbons 53 .

In this embodiment, the colored strip 51a and the colored strip 51b can fix several optical fiber ribbons 53 in a cross-helical manner as shown in FIG. Cause fiber bundle 5 (internal optical fiber) to come off.

Please also refer to Figure 1, Figure 2A, Figure 2B and Table 1 below. As shown in Figure 1, since the number of optical fiber bundles 5 is 15 (that is, the serial numbers 1 to 15 in Table 1), the respective colored strips 51a and colored strips 51b for the 15 optical fiber bundles 5 can be shown in Table 1 The colored strips 51 a and colored strips 51 b of different colors are arranged (that is, the color of the colored strips 51 a is fixed and the color of the colored strips 51 b is changed), so as to distinguish the 15 optical fiber bundles 5 more easily. Serial number of bundle 5 1 2 3 4 5 The color of the colored strip 51a and the color of the colored strip 51b blue, blue yellow, yellow green, green red, red purple, purple Serial number of bundle 5 6 7 8 9 10 The color of the colored strip 51a and the color of the colored strip 51b blue, white yellow, white green, white red, white purple, white Serial number of bundle 5 11 12 13 14 15 The color of the colored strip 51a and the color of the colored strip 51b blue, brown yellow, brown green, brown Red Brown purple, brown Table 1

FIG. 3 is a schematic diagram of several optical fiber ribbons 53 according to an embodiment of the present invention. Please refer to FIG. 2A , FIG. 2B and FIG. 3 at the same time. As shown in FIG. 3 , several pieces of optical fiber ribbons 53 in FIG. 2A and/or FIG. 2B may include a set of reticulated optical fiber ribbons 531, a set of reticulated optical fiber ribbons 532, a set of reticulated optical fiber ribbons 533, a set of reticulated optical fiber ribbons 534, and a reticulated optical fiber ribbon set 534. There are 5 reticulated optical fiber ribbon sets such as the reticulated optical fiber ribbon set 535, and each of the 5 reticulated optical fiber ribbon sets may include 8 core optical fibers. In this embodiment, such fibers may be 250 µm fibers. Furthermore, the 8-core optical fiber can correspond to 8 different colors, so as to facilitate identification.

Specifically, two pairs of the 8-core optical fibers can be bonded in a point-like bonding manner. Therefore, the 8-core optical fiber of this embodiment can be easily split into 1-core, 2-core or 4-core. Further, the 8-core optical fiber of the present invention can thus be easily coiled, enabling the fiber bundle 5 to comprise higher (multiple) core-count fibers.

It should be noted here that each fiber bundle 5 in FIG. 1 is only used to illustrate the present invention with FIG. 2A, FIG. 2B and FIG. The outer diameter of the cable.

In addition, as shown in FIG. ) can be black stripes of different thicknesses or numbers, and can be respectively arranged in the mesh fiber ribbon set 531 , the mesh fiber ribbon set 532 , the mesh fiber ribbon set 533 , the mesh fiber ribbon set 534 and the mesh fiber ribbon set 535 , to mark (distinguish) the set 531 of the reticulated optical fiber ribbons, the set 532 of the reticulated optical fiber ribbons, the set 533 of the reticulated optical fiber ribbons, the set 534 of the reticulated optical fiber ribbons and the set 535 of the reticulated optical fiber ribbons.

Please refer to FIG. 1 , FIG. 2A , FIG. 2B and FIG. 3 at the same time. Since the number of optical fiber bundles 5 of the optical cable shown in FIG. 1 is 15, and several optical fiber ribbons 53 in each optical fiber bundle 5 include 40 core optical fibers, therefore, FIG. 1 is a 600-core optical cable. For the optical cable shown in Figure 1, the outer diameter of the optical cable core is 9.5 mm, the thickness of the waterproof non-woven fabric 3 is 0.4 mm, and the thickness of the covering body 6 is 2.8 mm, so the completed outer diameter of the optical cable is less than 16 mm.

FIG. 4 is a schematic diagram of an optical cable according to another embodiment of the present invention.

The difference between the optical cable shown in FIG. 4 and the optical cable shown in FIG. 1 is that the number of optical fiber bundles 5 shown in FIG. 4 is ten. The optical fiber bundle 5 of the optical cable shown in Fig. 4 can also be implemented by the mode of above-mentioned Fig. 2A, Fig. 2B and Fig. 3 (that is, several pieces of optical fiber ribbons 53 in each optical fiber bundle 5 comprise 40 core optical fibers), therefore, Fig. 4 is a 400-core fiber optic cable. For the optical cable shown in Figure 4, the outer diameter of the optical cable core is 7.5 mm, the thickness of the waterproof non-woven fabric 3 is 0.4 mm, and the thickness of the covering body 6 is 2.7 mm, so the completed outer diameter of the optical cable is less than 14 mm.

At present, for optical cables with a small number of cores (for example, less than 300 cores), a 200-core optical cable is usually composed of 10 groups of 20-core optical fibers, and a 300-core optical cable is usually composed of 15 groups of 20-core optical fibers. Furthermore, the 20-core optical fiber is usually composed of five four-core mesh optical fiber ribbons.

Therefore, when the 600-core optical cable of the present invention and the 400-core optical cable are to be manufactured, it is only necessary to change the common 5 four-core mesh optical fiber ribbons into 5 eight-core mesh optical fiber ribbons (that is, change to the present invention The reticulated optical fiber ribbon set 531~reticulated optical fiber ribbon set 535), and the existing mold can be adjusted, without the need to purchase additional equipment, which can reduce investment and accelerate the mass production schedule of high core count optical cables.

In addition, as described above, the optical cable of the present invention is subjected to tension by the steel wire 1a and the steel wire 1b (as a tensile body). In order to select the appropriate wire diameters of the steel wire 1a and the steel wire 1b, the present invention takes the weight of an optical cable of 1.2km (high number of cores) laid as the tension load condition. Since the weight of the 600-core optical cable shown in Figure 1 is about 200kg/km (therefore the tension load condition is 240kg), and the weight of the 400-core optical cable shown in Figure 4 is about 165kg/km (therefore the tension load condition is 198kg), if you want to withstand 240kg And/or the tension of 198kg, the steel wire 1a and the steel wire 1b can use the steel wire with the wire diameter of 1.4mm (the steel wire with the wire diameter of 1.4mm can withstand breaking force greater than 192kg, so the tensile strength of the steel wire 1a and the steel wire 1b The total breaking force is 384kg). Based on this, the safety factor of the 600-core optical cable shown in FIG. 1 is 1.6, and the safety factor of the 400-core optical cable shown in FIG. 4 is 1.9.

In summary, the optical cable of the present invention can be efficiently manufactured based on existing manufacturing methods, and the components (for example, colored strips or optical fibers) in the optical cable of the present invention can be designed in different colors to facilitate identification, thereby The optical cable of the present invention is easier to use.

1a, 1b: steel wire 2a, 2b: stripped fiber rope 3: Waterproof non-woven fabric 5: Fiber bundle 6: covering body D1, D2: direction 51a, 51b: colored strips 53:Several optical fiber ribbons 531, 532, 533, 534, 535: collection of mesh fiber optic ribbons 531a, 532a, 533a, 534a, 535a: bar marking

FIG. 1 is a schematic diagram of an optical cable according to an embodiment of the present invention. FIG. 2A is a schematic diagram of an optical fiber bundle according to an embodiment of the present invention. FIG. 2B is a schematic diagram of an optical fiber bundle according to another embodiment of the present invention. FIG. 3 is a schematic diagram of several optical fiber ribbons according to an embodiment of the present invention. FIG. 4 is a schematic diagram of an optical cable according to another embodiment of the present invention.

1a, 1b: steel wire

2a, 2b: stripped fiber rope

3: Waterproof non-woven fabric

5: Fiber bundle

6: covering body

D1, D2: direction

Claims (5)

An optical cable, comprising: an optical cable core, which is formed by overlapping and wrapping a plurality of optical fiber bundles with waterproof non-woven fabric; a first steel wire; a second steel wire; a first stripped fiber rope; and a second stripped fiber rope, wherein: the first A steel wire and the second steel wire are symmetrically arranged relative to the optical cable core along a first direction; the first stripped fiber rope and the second stripped fiber rope are symmetrically arranged on the optical cable along a second direction core, and the first direction and the second direction are perpendicular to each other; each of the plurality of optical fiber bundles includes a first colored strip, a second colored strip and several optical fiber ribbons, and the first The colored strips and the second colored strips are used to fix the several pieces of optical fiber ribbons, wherein the several pieces of optical fiber ribbons include a set of 5 mesh optical fiber ribbons, and each of the set of 5 mesh optical fiber ribbons or include 8-core optical fiber, wherein the number of said plurality of optical fiber bundles is 15, and a 600-core optical fiber cable is completed, or the number of said plurality of optical fiber bundles is 10, and a 400-core optical fiber cable is completed; wherein the weight of said 600-core optical fiber cable is 200kg/km and the tension load condition is 240kg, wherein the weight of the 400-core optical cable is 165kg/km and the tension load condition is 198kg, wherein the diameter of the first steel wire and the second steel wire is 1.4mm. The optical cable according to claim 1, wherein the first colored strip and the second colored strip fix the several optical fiber ribbons in an SZ winding manner. The optical cable according to claim 1, wherein the first colored strip and the second colored strip fix the several optical fiber ribbons in a cross-helical manner. The optical cable according to claim 1, wherein the 8-core optical fibers correspond to 8 different colors. The optical cable according to claim 1, further comprising a covering body, wherein: the covering body is used to cover the optical cable core, the first steel wire, the second steel wire, and the first stripped fiber rope and said second stripped fiber rope.

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