JPS581106A - Structure of optical communication cable - Google Patents

Abstract

PURPOSE:To obtain an optical communication cable for a subscriber which suits to the use as both an exterior and an interior line. CONSTITUTION:An optical fiber 1 is covered with a coating 3 with a buffer layer 2 between. In the figure, 4 is a tensile strength line, and the coating 3 and tensile strength line 4 are arranged in parallel and then covered with an external coating 5. Further, 6 is a gap. The coating 3 uses a relatively flexible flame-retarded plastic material, e.g., PVC. The external coating, on the other hand, uses a hard plastic material which never deteriorates even when exposed outdoors to wind, rain, snow, sunshine, etc. e.g. PE. The buffer layer 2 should protect the optical fiber 1 sufficiently even when the external coating 5 is peeled, so fibrous materials are suitable. Therefore, this cable is used as an exterior line and a separated optical fiber 1 covered with the coating 3 is used as an interior line, so that the cable operates outdoors as the exterior interior line having superior tensile strength and is used indoors as the flame-retarded line with superior flexibility.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to the structure of an optical communication cable using an optical 7-eyeper. 41 Ks Optical m cable KI suitable for use as a subscriber cable for outdoor lines and indoor faK8
It is something that I do.

In conventional communication lines for subscriber subscribers using metal conductors, a protector is installed at the boundary between the outdoor line and indoor line to prevent abnormal current from entering the subscriber terminal due to contact with a commercial electric car during a lightning strike. The configuration is to install and connect the two. However, in optical fiber communication cables, over-reliance signals propagate through the optical fiber made of plastic, which is an insulator, so it is possible to make the cable non-metallic, and the above-mentioned abnormalities can occur without using a protector. No current enters the subscriber terminal.

Therefore, it is possible to use the same cable for indoor lines and outdoor lines without separating them.

However, outdoor wires must have sufficient tensile strength and weather resistance due to the environment in which they are used, and indoor wires require removability because they often have one fold, and they must be highly flame retardant. stomach.

Therefore, a single cable that satisfies both conditions has not yet been known.

1IIIK. Optical fibers are not easy to connect, and there are problems with reflection during loss or mode conversion at the connection point, so it is desirable to avoid connecting them at the lead-in part (wherever possible).

The present invention has been made in this background and can be used to connect 11Kt of cables without any connection points, both outdoors and indoors.
! The purpose is to provide communication cables that can be used.

The developed IJI has an optical fiber coated with a flammable plastic and a tensile strength fiber arranged in parallel, and both fibers are coated together with a hard plastic, etc., and this plastic outer sheath and the above-mentioned flammable resistant It is characterized by a fiber structure that is made of plastic and has a gap between it and the fiber, so that the fiber can be easily peeled off.

This will be explained in detail below using example drawings.

The figure is a sectional view showing the striped feed structure of the present invention.

Hikari 7 Aiba's circumference! ! The coating S is applied through the buffer layer 2. Reference numeral 4 denotes a tensile strength line, and the sheathing 3 and the tensile strength line 4 are arranged in parallel and are covered with an outer sheath 5 from the outside. There are six companies left vacant.

In this case, 11m13 is constructed of a flexible flame-retardant plastic ivy material. An example of this is rvo.

On the other hand, a Wb plastic material that does not deteriorate even when exposed to wind, snow, and sunlight is used for the outer cover + stt shoe.

- Example #: tPl. The low-strength layer 2 is used so that even if the outer covering 511m is peeled off, it can sufficiently protect the light 7 ipal, and a fibrous layer 2 is suitable. This buffer layer 2 can also be omitted depending on the thickness and nature of the coating 3.

The tensile strength 114 is suitable for steel and other metals.

It can also be pII. Moreover, it can also be made of plastic such as νRP or KEPTS.

Regarding the size of the diagram, the optical fiber 1 has a diameter of approximately 1 mm (as an example), an optical fiber 1 and a tensile strength of 1
14 is - for example - 5-6.

In this structure, the materials of the sheath 3 and the sheath 5 are selected so that the sheath 5 and the sheath 3 are not integrated with each other by adhesive or other means and can be easily peeled off.

- As an example, the sheathing 3 is PVA and the jacket 5 is Pl. In the case of materials that are likely to adhere over time, it is preferable to apply a #-agent to the outer periphery of the coating 3 during manufacture.

In such a structure, the vicinity of the gap 6 is cut 9 with a cutter force.
By tearing, the cable covered with the jacket 3 and the AK resistance 114 and the jacket 5 can be separated.

Therefore, if this cable is used as an outdoor cable and the separated cable 3 is used as an indoor cable, it will act as an outdoor cable with excellent tensile strength, and indoors it will have AM properties. It has excellent town characteristics and can be used as the 9th floor inner so. There is no connection point at that point, so a single optical fiber can be used continuously. Workability associated with connection,
This avoids problems such as signal loss and reflection. Also,
The outer sheath IK is made of a tough material with excellent weather resistance such as Pl, and the sheath 3 is made of a flexible material such as RYC.
This makes it the perfect cable for those environments.

That’s it! As is clear, the over-reliance cable according to the present invention can be configured with a single cable between outdoor and in-layer without ** points, so there is no connection loss, no connection work is required, and the transmission line is improved. It has a round structure that is excellent in performance, workability, and economy.

[Brief explanation of the drawing]

The figure is a sectional view of a cable structure according to an embodiment of the present invention. l・-optical fiber, 2-・buffer layer, 3・coating, 4・
...Tensile strength line, 5-Sheath, 6-Void.

Claims (1)

[Claims] (1) An optical fiber (1) and a coating (3) of a combustible and flexible insulating material that covers this optical fiber (3)
And, the tensile force #(4) placed in parallel with the coated optical fiber, the ζ0 tensile force wire and the coated optical fiber 7 can be easily peeled off between the coating and the common bracket. The structure of an optical communication cable includes an outer sheath (5) made of a hard insulating material with excellent weather resistance.