JP2001021778A - MANUFACTURE OF 0.75 mm PITCH DOUBLE CORE OPTICAL FIBER TAPE - Google Patents

Abstract

PROBLEM TO BE SOLVED: To contrive a manufacturing method to suppress a bending caused by a tension difference between optical fibers of a 0.75 mm pitch double core optical fiber tape in a conventional art within a range of no substantial interferrence, so as to solve a trouble of the bending. SOLUTION: This is a method for manufacturing a 0.75 mm pitch double core optical fiber tape to be taped while controlling tensions of optical fiber strands within a prescribed range. In this case, The tensions of the optical fiber are compared to be controlled to bring a tention difference between the optical fibers withina 30 g.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of manufacturing a 0.75 mm pitch two-core optical fiber ribbon, which can substantially eliminate the bending of the optical fiber ribbon by a simple method. is there.

[0002]

2. Description of the Related Art Connectors such as a MT-RJ and a small 2MT are used in a wiring system between premises and devices such as a LAN, and the pitch of these connectors is set to 0. 75 mm. A 0.75-mm-pitch two-core optical tape is used as an optical-tape core that can be easily directly connected to the connector having a pitch of 0.75 mm. By the way, the optical fiber ribbon is manufactured by adjusting the tension of the optical fiber to be supplied to a tape forming device while adjusting the tension to a predetermined range.
The 5 mm pitch two-core optical fiber ribbon (FIG. 1) has a larger distance between the optical fibers, that is, the above-mentioned pitch is larger than that of a normal optical tape (pitch: 0.25 mm). The difference greatly affects the tape bend, and a gentle curved bend is generated with the optical fiber having the higher supply tension inside. In the ordinary optical fiber ribbon, the curved bend due to the difference in tension between the optical fiber strands hardly occurs, and even if a slight bend occurs, it does not cause any problem.

However, in the 0.75 mm pitch two-core optical tape core wire, the optical tape core wire is apt to bend due to the above-described tension difference between the wires, and when this is remarkable, a tape coating removing tool is used. In the stripping work, the optical fiber at the end may be damaged or broken, or if the optical fiber ribbon is coded, the bending may cause undulation. This causes transmission loss. In addition, when this optical fiber core is pulled and stretched and wired, a difference occurs in the distortion between the optical fibers due to the tensile force for wiring, and the transmission characteristics between the pair of optical fibers are greatly different. Will occur.

[0004] Therefore, for a 0.75 mm pitch two-core optical fiber ribbon, it is necessary to suppress the above-mentioned curved bend to a practically unobstructed range. However, conventionally, in the case of a 0.75 mm pitch two-core optical fiber ribbon, as in the case of controlling the optical fiber core tension of the normal-pitch optical fiber core, the tape forming operation is performed efficiently and with high precision. The tension of each optical fiber is controlled in a necessary range, and the above-mentioned problem of the bending of the optical fiber ribbon has not been considered.

[0005]

SUMMARY OF THE INVENTION An object of the present invention is to solve the problem of the bending of the 0.75 mm pitch two-core optical fiber ribbon caused by the difference in tension between the optical fibers in the above-mentioned prior art. It is an object of the present invention to devise a manufacturing method of the bending so that the bending can be suppressed to a range that does not substantially hinder the bending.

[0006]

Means taken to solve the above problem is a method of manufacturing a 0.75 mm pitch two-core optical fiber ribbon for forming a tape while controlling the tension of an optical fiber in a predetermined range. As a premise, the tension of the optical fiber is controlled such that the difference between the optical fibers is within 30 g.

[0007]

There is no problem if the tension difference between the optical fiber strands can be controlled to zero, but the tension of the optical fiber strands is controlled within a certain range while always slightly fluctuating. The tension difference between them cannot be controlled to substantially zero. However, it is quite possible to control this tension difference to within 30 g, which is practically relatively easy to control. On the other hand, the tension difference between the pair of optical fiber strands is not directly manifested as bending of the optical fiber ribbon in a minute range, and the tension difference between the 0.75 mm pitch two-core optical fiber ribbon is not large. There is no problem in the range where the bending is extremely small, and the tension difference between the pair of optical fibers is 30 g.
0.75m caused by this tension difference when
The bending of the m-pitch two-core optical fiber ribbon is suppressed to a practically allowable range that does not cause the above-described practical problem. That is, when the tension difference is within 30 g, the bending amount is 6
It is clear from the correlation between the feeding tension difference and the tape bending amount in FIG.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A pair of optical fiber strands is set so that the horizontal spacing between the upper end and the lower end of a 0.75 mm pitch two-core optical tape having a length of 70 cm when vertically hanging is within 60 mm. To control the tension difference between them.

[0009]

The tension difference between a pair of optical fibers and the bending of a 0.75 mm pitch two-core optical fiber due to differences in the thickness of the optical fibers, tape thickness, tape width, etc. Is slightly affected. But 70cm
If the horizontal distance between the upper end and the lower end when vertically hanging is within 60 mm, the bend does not actually pose a problem. Therefore, the above-described problem is solved by controlling the difference in tension between the optical fibers so that the bending falls within this range.

[0010]

Next, an embodiment will be described with reference to the drawings.
This example is an example of a two-core optical tape having a width of 1.1 mm and a thickness of 0.4 mm (pitch: 0.75 mm) using a dyed wire having an outer diameter of 250 μm. Single mode), MM (50/125), and the coating material is UV-curable urethane acrylate, and the tape forming line speed is 400 m / min.
Each was produced 1 km. The pitch in this example is measured in-line, up to 0.77 mm,
It has been confirmed that the distance is at least 0.72 mm. Table 1 shows the prototype tape cores.

[Table 1] With respect to the above Examples, a heat cycle test was performed twice on a bundle of optical tapes having a diameter of 300 mm in a cycle of −20 ° C. → −10 ° C. → + 60 ° C. FIG. 3 shows the test results. In addition, a load of up to 1000 N was applied in 100 N steps to each prototype optical tape core wire having a tape length of 100 mm, and the transmission loss fluctuation in each step was measured. As a result, the loss fluctuation when a load of 1000 N was applied was 0.2 dB or less in all the prototype optical tape cores.

[0011]

As described above, for a 0.75 mm pitch two-core optical fiber ribbon, the tension difference between the pair of optical fibers at the time of tape formation is controlled within a predetermined range, whereby the optical fiber core is controlled. The bending of the 0.75 mm pitch two-core optical tape core wire due to the difference in tension between the wires can be suppressed within a range that does not hinder practical use. Damage and breakage can be prevented, and transmission loss caused by the bending can be reduced as much as possible.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a 0.75 mm pitch two-core optical fiber ribbon of an embodiment.

FIG. 2 is a graph showing a correlation between a tension difference between a pair of optical fiber strands in a 0.75 mm pitch two-core optical tape core wire and a bending amount of the 0.75 mm pitch two-core optical tape core wire.

FIG. 3 is a graph showing a heat cycle test result for an example.

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Keiji Ohashi 1440 Mutsuzaki, Sakura-shi, Chiba F-term in Fujikura Sakura Works (reference) 2H046 AC12 AC21 2H050 AA00 AA09 AC69 AC71

Claims (3)

[Claims] 1. A method for manufacturing a 0.75 mm pitch two-core optical fiber ribbon, wherein the tension is controlled while controlling the tension of the optical fiber within a predetermined range. The difference is 30
g, wherein the tension of the optical fiber is controlled so as to be within g. 2. A method for producing a 0.75 mm pitch two-core optical tape core, wherein the optical fiber is formed into a tape while controlling the tension of the optical fiber within a predetermined range. The method is characterized in that a tension difference between a pair of optical fiber strands is controlled so that a horizontal distance between an upper end and a lower end of the line when the line is vertically dropped is within 60 mm.
A method for manufacturing a 5 mm pitch two-core optical fiber ribbon. 3. A method for producing a 0.75 mm pitch two-core optical fiber ribbon, wherein the tension is controlled while controlling the tension of the optical fiber within a predetermined range. The difference is 30
g of the optical fiber is controlled so as to be within g, so that the horizontal distance between the upper end and the lower end of the 0.75 mm pitch two-core optical tape core wire having a length of 70 cm when the core wire is vertically dropped. Is set within 60 mm.
A method for manufacturing a 75 mm pitch two-core optical fiber ribbon.