JPH10206708A - Integrated multifiber tape laminated optical fiber - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable more high-density lamination by reducing the volume increase of laminated body even when the integrated laminated body is coated by integrally coating it with 2nd UV setting resin having a prescribed Young's modulus. SOLUTION: Plural pieces of multi-fiber tape optical fiber 12 constituted by arranging plural coated optical fiber 10 in one line and integrally coating them with 1st UV setting type resin 11 around that line are laminated and further, this laminated body is coated with 2nd UV setting type resin 13 as a whole and integrated. The 1st and 2nd UV setting type resins 11 and 13 are set so that the Young's modulus of 2nd UV setting type resin 13 can get larger. The Young's modulus of 1st UV setting type resin 11 can be equal with that of UV setting type resin conventionally consisting of the tape optical fiber 12 but its outer periphery is further coated with the 2nd UV setting resin 13 having the much larger Young's modulus and the thickness of coating due to the 1st UV setting type resin 11 can be reduced rather than heretofore.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a monolithic multi-core tape laminated core obtained by laminating optical fiber ribbons accommodated in slots of a slot rod in multiple layers.

[0002]

2. Description of the Related Art As shown in FIG. 2, a typical slot type cable as a relay optical fiber cable has a plurality of (four in the example shown) optical fiber cores 100 arranged in a line and surrounding the core. Are laminated in a groove 104 of a slot rod 103, which is a plastic cable member, in a predetermined number (five in the example of the figure). The slot rod 103 is housed in this state, and the outer circumference of the slot rod 103 is sequentially wound with a holding tape (not shown) and a cable sheath.

However, each optical fiber ribbon 1
No. 02 is generally laminated at the time of twisting without performing mutual bonding or the like at the time of manufacturing a cable, and is generally made into a cable while maintaining that state. Therefore, each of the optical fiber ribbons 102 may cause collapse of the laminate in the groove 104 of the slot rod 103 during cable manufacturing, or may undulate in the optical fiber ribbon 102 in the longitudinal direction, thereby lowering the transmission loss characteristics. The quality could be reduced. This increases the probability as the number of core wires, that is, the number of stacked layers increases, and becomes an important problem in transmission loss characteristics. In addition, in order to make a cable, it is necessary to perform operations such as supply bobbin set, feeding device wiring, wire passing operation, tension setting, and the like as many as the number of stacked optical fiber tape core wires 102. As the number of cores increases, the number of man-hours for cable manufacturing increases, which leads to a reduction in product yield and an increase in manufacturing cost.

In order to solve the above problem, Japanese Utility Model Application Laid-Open No.
No. 73611 discloses an individual optical fiber ribbon 1.
No. 02 describes an optical fiber unit in which unevenness is provided on one or both surfaces, the unevenness is fitted and laminated, and furthermore, the space between the optical fiber tape core wires 102 and the surface are coated with a UV-curable resin to form a unit. .

[0005]

However, the optical fiber unit described in Japanese Utility Model Application Laid-Open No. 5-73611 is effective in reducing the transmission loss characteristics due to the collapse of the stack and increasing the yield due to the improvement of the workability. Although expected, in the case of an optical fiber cable, there is a possibility that some problems of basic characteristics may occur in contrast to the conventional product. That is, in the configuration of FIG.
When the optical fibers 02 are integrated, the U-shaped optical fibers 102 are integrated when connecting or branching the optical cable.
After peeling off the V-curable resin, each optical fiber core 1
At each time, the connection and branching work is performed. At this time, the UV curable resin 1 constituting the optical fiber ribbon 102 is
When the hardness (generally represented by Young's modulus) of the UV-curable resin for integration with 01 is the same or a similar value, when the UV-curable resin for integration is coated and UV-cured, The adhesion to the surface of the already cured UV-curable resin 101 becomes too strong, and the workability of removing the UV-curable resin for integration is reduced. Therefore, the optical fiber ribbon 1
When the hardness of the UV-curable resin for integration with the UV-curable resin 101 constituting 02 is made different, the peeling workability is improved. In this case, it is generally advantageous that the hardness of the UV-curable resin for integration is higher in terms of mechanical strength, and the hardness is higher than that of the UV-curable resin 101 forming the optical fiber ribbon 102. Although it is conceivable to make the difference higher by increasing the height, if the hardness of the UV-curable resin for integration is too high, the bending and kinking characteristics of the integrated laminated tape core unit are reduced, and the slot rod is reduced. The upper limit must be restricted because the transmission loss characteristic in the twisting process is reduced. However, these points have not been discussed in Japanese Utility Model Laid-Open No. 5-73611.

Further, since the entire outer surface of the laminated body of the optical fiber ribbon 102 is covered with a UV curable resin, the volume of the entire laminated body increases when the optical fiber ribbon 102 having the same size as the conventional one is used. I do. On the other hand, since the depth and width of the groove 104 of the slot rod 103 are often standardized, the entire width of the laminate does not fit in the groove 104 due to an increase in the overall width, or the slot rod increases due to an increase in the height of the laminate. It may project from the surface of 103. Therefore, it is necessary to take measures such as the need for the special slot rod 103 and the reduction of the number of stacked layers, which leads to an increase in cost and a decrease in transmission amount.

[0007] The present invention has been made in view of the above-described situation, and it is possible to cover the laminate for integration while enjoying the effect of integrating the laminate of optical fiber ribbons. The volume increase of the laminated body is small, and not only can it be accommodated in the groove of the standard slot rod, but also the integrated multi-layer structure with higher density than the conventional laminated body of the standard optical fiber ribbon. It is an object to provide a core tape laminated core wire.

[0008]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a multi-layered optical fiber ribbon comprising a plurality of optical fibers which are aligned and integrally coated with a first UV curable resin. And a laminated body of the optical fiber ribbon is integrally coated with a second UV-curable resin having a predetermined Young's modulus larger than that of the first UV-curable resin. This is achieved by an integrated multi-core tape laminated core wire.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The integrated multi-core tape laminated core of the present invention will be described below with reference to the drawings. FIG. 1 is a sectional view showing an embodiment of the integrated multi-core tape laminated core wire of the present invention. As shown in the figure, the integrated multi-core tape laminated core of the present invention is composed of a plurality of (four in the example in the figure) optical fiber cores 10 arranged in a line and the periphery thereof being a first UV-curable type. A plurality of (five in the example in the figure) multi-core optical fiber ribbons 12 integrally coated with a resin 11 are laminated, and the entire laminate is further covered with a second UV-curable resin 13. And integrated.

Here, the first UV-curable resin 11 and the second
UV curable resin 13 is the second in its Young's modulus.
Of the UV-curable resin 13 is set to be larger. Although the Young's modulus of the first UV-curable resin 11 may be equivalent to the Young's modulus of the UV-curable resin constituting the optical fiber ribbon 12 in the related art, in the present invention, this first UV-curable resin is used. 11 further to the first UV
Since the structure is further covered with the second UV-curable resin 13 having a larger Young's modulus than the curable resin 11, the thickness of the coating layer of the first UV-curable resin 11 can be reduced as compared with the related art. The Young's modulus of the first UV-curable resin 11 and the Young's modulus of the second UV-curable resin 13 can be set appropriately relative to each other, but in consideration of practical characteristics as an optical fiber cable. The Young's modulus of the first UV-curable resin 11 is 50 to 80 (kg / mm ² , 23 ° C.).
And the Young's modulus of the second UV-curable resin is 90 to 10
0 (kg / mm ² , 23 ° C.).
Incidentally, these UV-curable resins are not particularly limited in the type, composition, molecular weight, etc. of the resin as long as they satisfy the above range of the Young's modulus, and fall within the above range of the Young's modulus according to a standard method. It can be adjusted or obtained from the market. For example, JS is used as the first UV curable resin.
R3041 made by R (Young's modulus: 51 kg / mm ² ) and R3059 made by JSR (Young's modulus: 93 kg / mm ² ) as the second UV-curable resin can be easily obtained from the market.

As described above, the first UV-curable resin 11
Is coated with the second UV-curable resin 13 having a large Young's modulus, so that the thickness of the first UV-curable resin 11 is smaller than that of the conventional resin within a range that does not impair the necessary minimum mechanical strength. Can also be made thinner. Due to such a reduction in thickness, it is possible to reduce the stacking height of the entire laminated body of the optical fiber ribbons 12 and increase the number of laminated optical fiber ribbons 12 that can be accommodated in the slots (not shown) of the slot rod. And the density of the optical fiber can be increased. That is, in comparison with the conventional typical four-core optical fiber ribbon, the present invention has a thickness of 0.09 mm.
(± 0.02 mm) and 0.04 mm (± 0.
Even if the optical fiber cable is miniaturized, there is no problem in practical use as an optical fiber cable, and when the optical fiber cable is laminated, the height of six laminated optical fiber tapes 12 according to the present invention is the same as that of the conventional optical fiber tape. The height becomes equal to or less than the height of the five laminated sheets, and one more optical fiber ribbon 12 can be accommodated in the same groove of the slot rod. In addition, this thinning allows the optical fiber ribbon 1 to be used.
Even if the entire laminated body of No. 2 is covered with the second UV-curable resin 13, it can be suppressed to a size that can be sufficiently accommodated in the groove of the slot rod of the standard product.

The integrated multi-core tape laminated core of the present invention is constructed as described above. Further, each of the optical fiber tape cores 12 constituting the laminated body is stretched and adjusted in tension according to the lamination position. It is desirable to laminate in the state of being provided. That is, as shown in FIG. 2, when a plurality of optical fiber ribbons 102 are laminated and twisted into the groove 104 of the slot rod 103, the lowermost optical fiber ribbon 102a that is in contact with the bottom of the groove 104 is maximized. In general, the layers are stacked in a state where the tension is adjusted and applied so as to be smaller as the position is higher. This is because the amount of expansion of each optical fiber ribbon 102 when housed in the groove 104 is the smallest in the lowermost layer, and gradually increases upward. Therefore, the lowermost optical fiber ribbon 10
2a (or the uppermost optical fiber ribbon), the elongation tension corresponding to the difference in the amount of expansion of each optical fiber ribbon 102 when stored in advance in each optical fiber ribbon 102 is as follows. Each fiber optic tape 10 in the laminated state when the slot rod is housed is provided by calculating from the formula and twisting as an integrated tape laminated core.
2 can be equalized.

[0013]

(Equation 1)

Where d is the outer diameter of the slot rod (m
m), P is the pitch of the groove (mm), a is the thickness (mm) of the optical fiber ribbon, b is the depth of the groove (mm), π is the circular constant, and I is the optical fiber ribbon. number of laminated sheets, the strain after epsilon _x is Kepuru twisting (%), E _S is the Young's modulus of the slot rod (kg / mm ^2), the cross-sectional area of S _S is the slot rod (mm ^2), T _S is the slot rod tension (Kg), E
_t is the Young's modulus of the optical fiber ribbon (kg / m
m ² ), _St is the cross-sectional area (m
m ² ). In this way, the laminated body of the optical fiber ribbons 102 in which the respective elongation amounts are adjusted and laminated becomes uniform in the elongation amount as a whole of the laminated body, and can stabilize the transmission characteristics when the slot rod is housed. it can.

Also in the present invention, the optical fiber ribbon (for example, the optical fiber ribbon indicated by reference numeral 12a in FIG. 1) which is closest to the groove bottom when housed in the groove of the slot rod as described above is maximized. And an optical fiber ribbon (12 in FIG. 1).
b) in a state in which elongation tension is applied so as to gradually decrease toward the optical fiber ribbon (b).
It is preferable to integrate with the UV-curable resin 13.

[0016]

As described above, according to the present invention, the effect of integrating the laminated body of the optical fiber ribbons, that is, the effect of the slot rod of the optical fiber ribbon at the time of manufacturing the optical fiber cable, is obtained. The optical fiber ribbon can be housed in slot rods at high density, and the transmission volume can be significantly increased, while enjoying the reduction of manufacturing costs by preventing stacking collapse in the grooves and reducing the number of man-hours for manufacturing. Can be.

[Brief description of the drawings]

FIG. 1 is a sectional view showing an embodiment of an integrated multi-core tape laminated core wire of the present invention.

FIG. 2 is a sectional view of a main part of a conventional optical fiber cable in which optical fiber ribbons are laminated.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Optical fiber core wire 11 1st UV curable resin 12 Optical fiber tape core 13 13 Second UV curable resin

Claims (2)

[Claims] A first optical fiber core is aligned with a first optical fiber.
The optical fiber ribbon coated integrally with the UV-curable resin is laminated in multiple layers, and the laminated body of the optical fiber ribbons has a Young's modulus greater than that of the first UV-curable resin. 2. An integrated multi-core tape laminated core, which is integrally coated with a UV curable resin. 2. The first UV-curable resin has a Young's modulus of 50 to 80 (kg / mm ² , 23 ° C.).
UV curable resin has a Young's modulus of 90 to 100 (kg / m
m ² , 23 ° C.).