JPS58156915A - Treatment of surplus length of optical fiber cable - Google Patents

Abstract

PURPOSE:To prevent twisting force from acting on the junction of cores and to improve reliability, by providing freely extensible and contractible tubular spiral coils having slits on both sides of the junction. CONSTITUTION:Freely extensible or contractible tubular spiral treating coils 3 are provided on both sides of the junction 4 of cores of optical fiber cables 1. The coils 3 are formed of pipes made of metals or the like and are provided with slits 6 in the axial direction thereof to permit easy insertion of the surplus lengths 2' of optical fiber cores 2 therein. The surplus lengths 2' are stored through the slits 6 in the coils 3. Since the lengths 2' are contained in the coils in the above-mentioned way, the acting of twisting force on the junction is prevented and the reliability of the junction is improved.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for processing the extra length provided on both sides of the connection part of an optical fiber (hereinafter referred to as an optical fiber (hereinafter referred to as "optical cable")), and in particular, a method for processing the excess length of an optical fiber cable (4 fibers or less). It concerns a method of processing.

In recent years, optical cables have been developed and used for communications that have a large information capacity and are not susceptible to electromagnetic induction interference.

This optical cable needs to have an extra length on both sides of the connection to make it possible to pull out the connection device and reconnect it. , a core wire connection portion of the optical cable 11; . ii! i
j. Light, eye 2 round line. Extra length 1B, bend 1B to a diameter of 6
The method was to wind them around cylindrical extra length processing bobbins 14 and 14 so that the length was 0111 or more.

Note that if the bending radius is made too small, the transmission loss of the optical cable will increase.

However, in Jin's method, regardless of the number of optical fiber cores in the optical cable 11, a certain length is required in order to maintain the minimum radius of curvature.
Since the bobbin section) becomes longer, the entire connecting section including these becomes longer. This has an advantage in the case of multi-core optical cables, but in the case of bundled optical cables, it becomes longer than necessary.

After fixing the fiber connecting portion 12 as shown in FIG.
Since it is processed by wrapping it around the joint, it has the disadvantage that twisting force is applied to the connection part.

The present invention has been made to solve the above-mentioned problems. During the connection work, the excess length of the optical cable is extended to facilitate the connection, and after the connection work is completed, the excess length is shortened and the excess length is processed. The length can be shortened, and no twisting force is applied to the connection part.
It is an object of the present invention to provide a method for processing the extra length of an optical fiber H-pull, which improves the reliability of the connection part.

The first invention of the present invention is to provide an optical fiber coil (having slits in the axial direction on both sides of the fiber connection part of the cable), which can be expanded and contracted in the form of a tube, into which the optical fiber core is inserted. This is a method for processing the extra length of Hikari), I, and Pull, whose % characteristic is to accommodate the extra length of the line.

The second aspect of the present invention is to provide a pipe-like extensible spiral processing coil having slits in the axial direction on both sides of the fiber connection part of the optical fiber cable, and to store the excess length of the optical fiber core therein. A method for processing excess length of an optical fiber cable, characterized in that the optical fiber cable is stored, and during connection work, the spiral processing coil is stretched and the optical fiber core wire is pulled out to a desired connection position. .

The eighth aspect of the present invention is to provide a pipe-like extensible spiral processing coil having slits in the axial direction on both sides of the fiber connection part of the optical fiber cable, and to store the excess length of the optical fiber core therein. Store it in front, 8 lights 7. IKaya Line.

When the remaining length is 8 and the cutting time is 0, a part of the spiral processing coil is cut and removed, and the optical fiber (a light characterized by drawing out the remaining length of 4 wires) is removed. - This is a method for processing the extra length of the pull.

The optical fiber in the present invention has an optical fiber core of less than 10 cores, and the optical fiber Iu wire refers to an optical fiber (a core wire made of glass fiber → or a core wire made of synthetic resin, etc.). It means a wire coated with a coating layer.

Hereinafter, the present invention will be explained with reference to the drawings and examples. Figure 2 is a diagram illustrating an embodiment of the method of the present invention, where Figure 0) is a top view showing the state after the connection work is completed, and Figure 2 is a side view showing the state before the cable connection part is installed. It is. In the figure,
1.1 is an optical cable to be connected, and 2.2 each represents one of the optical fiber round wires therein.

Reference numeral 8.8 denotes a helical processing coil in which the extra lengths 2/ and 2/ of the optical fibers and main clamps 2 and 2 are housed, respectively. The spirally processed coil 8 is formed by molding a pipe made of, for example, plastic or metal into a spiral coil, and in order to facilitate insertion of the extra length 2' into the coil, for example, the outermost circumferential side of the coil of the pipe is A slit 6 is provided in the axial direction (vertical direction) through which the optical fiber/core wire passes, as shown in the lower cross-sectional view.

It is also possible to insert the extra length 2' of the optical fiber core into a helical processing coil without slits end-to-end, but this is difficult if the extra length is long.

To connect the optical cable, use Optical Fino・LL? The extra lengths 21 and 27 of the wires are dropped into the spirally processed coils 8 and 8 through the slits 6 and 6, respectively, and during connection work,
←) As shown in the figure, extend the pitch of the coil to connect the core wire. After the connection work is completed, The connection part 4 is fixed to the holding member 5, and the connection of the optical cable is completed. In this case, since the connection work can be carried out by stretching the coil 3 arbitrarily, it is easy to connect the optical fiber and the main wire.

Also, after connecting, you only need to shorten the coil pitch based on the original pitch.
No torsion stress is applied to the connection.

Usually, an optical fiber is contained within one spiral processing coil.
One B wire is stored, but if the optical 7 eye j 7 wire is 2≦≧ 6- on a stone plate, adjust the coil pitch of each spiral processing coil, for example, as shown in Figure 3, The shaped coils A, B, etc. are overlapped in the axial direction to form the same cylindrical shape, and the extra length can be accommodated by multiple winding.

Next, when extra length of optical fiber cable is needed, for example, when reconnecting and using the extra length of optical cable, it is necessary to create a spiral long enough to pull out the optical fiber/main cable necessary for reconnection. It is possible to cut and remove the processing coil, pull out and use the remaining length of the optical fiber/main clamp, and easily reconnect it.

As described above, the method of the present invention provides pipe-shaped extensible and contractible spiral coils having axially slits on both sides of the fiber connection part of an optical fiber cable. The extra length of the optical fiber/main tightening can be accommodated in the spacer, and during the connection work, the spiral processing coil can be extended to pull out the optical fiber/random wire to the desired connection position 1.
The connection is easy, and after the connection work is completed, the pitch of the spirally processed coil is simply shortened and returned to its original state, so no twisting force is applied to the connection part, which has the effect of preventing deterioration of characteristics.

In addition, in the method of the present invention, since the extra length is a coil with a small pitch, the entire length of the connection including the extra length can be shortened, for example, compared to the conventional method. This method has the advantage that the connection process is inexpensive because only an inexpensive spiral coil is used as the material.

Furthermore, the method of the present invention has the advantage that in the case of two or more cores, it is possible to process the extra length by adjusting the pitch of two or more spiral processing coils and overlapping the coils.

According to the Akira Nakamata method, when extra length of the optical fiber is needed, a part of the helical processed coil is cut and removed, and the extra length of the four optical fibers is drawn out and used. Therefore, there is an advantage that the extra length of the optical fiber can be easily drawn out.

[Brief explanation of the drawing]

FIG. 1 is a side view showing an example of a conventional optical fiber 3-pull connection section. Figures 2(a) and 2(b) are diagrams for explaining the embodiment of the method of the present invention. Figure 2(a) is a top view showing the state after the connection work is completed, and Figure 2(b) is a diagram showing the state after the connection work is completed. FIG. 3 is a side view showing the previous state. FIG. 8 is a side view showing a state in which two spiral processing coils are stacked in an embodiment of the method of the present invention. l, 11... Optical fiber/pull, 2... Optical 7-eye nine wire, 2', 1B... extra length, 8... spiral processed coil, 4.12... core wire Connection part, 5... Holding material, 6
...Slit, 7...Connection position, 14...Excess length processing bobbin. 9- Ho 2 Mi - Nishikiichi

Claims (3)

[Claims] (1) A pipe-shaped extensible spiral processing coil having slits in the axial direction is provided on both sides of the fiber connection part of the optical fiber cable, and the extra length of the optical fiber core is accommodated therein. A method for processing the excess length of optical fiber and pull. (2) A pipe-shaped extensible spiral processing coil with slits in the axial direction is provided on both sides of the optical fiber cable fiber connection part, and the extra length of the optical fiber core is accommodated in the coil. A method for processing excess length of an optical fiber cable, characterized in that during work, the spiral processing coil is extended and the optical fiber round wire is pulled out to a desired connection position. (3) A pipe-shaped extensible spiral processing coil having slits in the axial direction is provided on both sides of the fiber connection portion of the optical fiber cable, and the extra length of the optical fiber core is accommodated therein. An optical fiber sabre characterized in that when an extra length of the optical fiber is required, a part of the spiral processing coil is cut and removed to draw out the extra length of the optical fiber of the said part. Extra length processing method.