JPS5931906A - Multicore optical fiber cable - Google Patents

Abstract

PURPOSE:To manufacture multicore optical fiber cables by a simple device at a high speed without twisting, and to constitute many kinds of case with common parts, by dividing a spacer into modules and assembling them in a flat section shape. CONSTITUTION:The spacer 6 is divided into channel-sectioned members. They are uniform in a section shape lengthwise and made into modules by setting the formation of them properly. Three spacer modules 3 are arrayed flatly and one cover module 7 is used to form a spacer which has three spacers 3; plural optical fiber cores are installed in the respective spaces 3 to constitute a multicore optical fiber cable. In this case, the optical fiber cores are installed in the spaces right before the spacer modules are assembled. Further, materials 4 having high tensile strength are arranged in succeeding stages right after the spacer modules 6 and cover module 7 are combined together, and the cable is provided with a plastic sheath 5 by extrusion to complete the cable.

Description

[Detailed description of the invention] The invention can be manufactured economically by a simple manufacturing method.
This article relates to the structure of a multi-core optical fiber cable.

Optical fiber cable for i[IJ (J), which accommodates a large number of optical fibers, differs from conventional cables made up of copper wire pairs,
In order to prevent the transmission characteristics 71 and mechanical properties of the original fiber from deteriorating, a special structural film d1 is required to withstand conditions such as external forces and temperature changes. External forces include tension on the cable (1111), and thermal expansion and contraction of the forest material is a problem due to temperature changes.This 11. optical transmission loss increases when the optical fiber is subjected to minute bends. Easy, d°6 large 7
? This depends on two points: when subjected to tension or elongation strain, it is easy to break. For this reason, a suitable structure for an optical fiber cable is one in which the original fiber is not tightly wrapped within the cable, but is accommodated loosely with some slack.

Spacer-type optical fiber cable is a typical example.
σf: Currently, the structure shown in the 11th m is adopted.

The original fiber core 41111 is loosely housed within the space 8 of the star-shaped spacer 2. The center of the cable has 4 tensile strength members, and the outer surface is covered with a jacket 5.

I'm here. The star-shaped spacers C are twisted in the longitudinal direction, and the optical fibers are also twisted around the central axis. If the wire is twisted and has a circular (star-shaped) cross section, it can be bent in either direction, and it has the advantage that it can be accommodated in any space, and the bending conditions are uniform for the wire. However, on the other hand - the twisting star IF! .

When manufacturing the spacer, it is necessary to use a large equipment with vinegar to rotate M-minutes and f-1, and when assembling the core wires, a large number of There are major problems that impede cost reduction, such as the complicated operation of twisting the YC fiber core wires and using a dangling cord.

The present invention divides the spacer into modules and
It has an unprecedented configuration with a flat cross section and a J1% combination of T, and is common in terms of operation and bending direction (limited to 2n, but no twisting, and can be manufactured at high speed with a 1π18 device). The purpose is to provide a multi-core optical fiber cable that can be made with a wide variety of parts, making it possible to achieve significant economical savings.

The F1m plane will be explained in detail below.

+5) Figures 2, 3, 3, and S are diagrams showing embodiments of the present invention, in which the IC core is an optical fiber, 8 is a space, 4 is a tensile strength material, and 5 is an outer jacket. , 0&i U-shaped N
i side spacer module, 7 is cover module,
EjG: f tensile strength [spacer module including 4F, 9G
f Cover module 1 including tensile strength material 4 (J & Matsu C
The fiber ribbon 11 is a rubber protrusion.

Spacer G has a U-shaped cut 11 as shown in Figure 2 (5).
Divided into 5 sizes with 11 pieces. The cross-sectional shape is uniform between the mouth and the length, and the shape is adjusted appropriately to create a module. Figure 2 (5)
By arranging three spacers in a flat shape in the spacer module 6 and using one cover module 7, a spacer having three spaces is formed as shown in FIG. The optical fiber cables used to accommodate fiber cables are made up of multi-core fiber optic cables. Here's how to accommodate the optical fiber in the space! 1! i is determined by the directivity M11:y of the spacer module assembly process. Immediately after roughly assembling the spacer module and cover module, four tensile strength members are arranged in a continuous process, and a plastic jacket 5 is extruded to complete the cable.

The spacer module 0 and the cover module 7 can be easily manufactured by extrusion molding of general plastic resin. Since tan has a uniform shape with no twist in the length direction, it is possible to easily manufacture a Vt-C high di degree.

Expanding the action of the spacer module (as a JQ structure,
As shown in FIG. 3 (5), it is effective to embed the tensile strength moon 4 in the module and integrally mold it.

In this way, each module has a tensile strength of +44
, cable) i7i h (# ti'i Lgo 3rd
It is more compact as shown in Figure (111), and the process for installing one cable can be simplified.

Arrange spacer modules in a flat form i′I, collect fi
Depending on the configuration, R can easily be made by simply changing the number of cables and modules (41) with different numbers of center connections.
I can do 4 things. Figure 5 (5), (IJI is 1) 2
Pieces, #1. ', If using spacer module 8 ligation of l
(1i?Example)The tensile strength increases or decreases in proportion to the number of fibers, and the appropriate tensile strength can be easily determined by f.10 is a ribbon fiber made by bundling five Y6 fibers, The Tr that accommodates da ribbons in space 8 is
/Since the number of fibers accommodated per space is θ fibers, the structure shown in Figure q is a ψθ fiber cable, and the structure shown in Figure q (C) is a θ fiber cable.The present invention or &-1 Conventional In order to effectively utilize the space of the spacer-shaped cable (11J), such a ribbon fiber is angled, but the ribbon shape is inappropriate for the 474-shaped cable, and one of the methods of the present invention is It is best to accommodate them in a space that is uniform in the lengthwise direction.

Flat-cut cables such as those shown in Figs. This does not result in a practical defect.In fact, as shown in the figure, it is dangerous for a cable that accommodates ribbon fibers to bend easily in any direction; It is preferable for the optical fiber to have a curved shape in order to maintain the transmission characteristics and mechanical characteristics of the optical fiber.

In addition, in the present invention, since no twist is applied to the original fiber core wire housed in the cable space, there is no twist to the C fiber when bending the cable. In order to prevent IJ tension and stretching, m! (Support) It is necessary to leave original fiber core #11 slack in space 8 as shown in (5).
% of the length increment of hyeonfeng is sufficient and adding the traditional twist
It is below. In order to easily create the desired slack, soft rubber protrusions 11 are inserted at intervals on the inner surface of the spacer module, as shown in Fig. S f131. It is also effective to provide one.

The original fiber cable C, the actual connection between the cables is M (an important component. Connection ih: r v + s and C
Then, the outer sheath 5 is removed, and every m core is exposed and bonded. In the cables of each of the above structures, after removing the jacket 5, each spacer module is handled separately, and connection work is performed while preventing breakage of each core wire. After completing the fiber connection (in order to properly store the excess fiber length), the core MTh should be removed for each spacer module.

As explained above, according to the present invention, n? By assembling common parts that can be modularized into a simple structure, it is possible to manufacture multi-core optical cables with various numbers of fibers up to 4M, and the cable manufacturing equipment can be easily manufactured at high speed. From this, it can have a great effect on reducing the total price of the original fiber cable.

[Brief explanation of the drawing]

1/Figure C: Cross section of conventional spacer-type optical fiber cable; Figure 2: Figure 3: Figure 3: (B); Installation of nine fibers in the spacer module. This is a diagram. ■...Optical fiber)<core wire, 2...Star J
lt spacer, 8... Space, 4...
・・Tensile month, 5・・・・Outer jacket, 6 Spacer module, 7・・・・Cover module, 8・・・・
・Spacer module, 9... Cover module ・ 10... Optical fiber ribbon, 11...
...Rubber protrusion. Figure 2 Figure 3 Figure 4 (A) (B) Figure 5 (B)

Claims (1)

[Claims] l A plurality of optical fibers? In a spacer-shaped optical fiber cable that is loosely accommodated in the spacer space and horizontally EEcCrl, the spacer number is divided into a spacer module having one U-shaped cross section. A multi-core optical fiber cable characterized in that the spacer modules are assembled in a flat shape. 2 Spacer module is tensile to -ISt+ of the cross section)
The multi-layer cable according to item 1, characterized in that it is integrally extruded and includes J material.