JPH09258032A - Method for housing extra length of juncture of multi-core optical fiber - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for housing the extra length of the juncture of optical fiber suck as submarine optical cable, etc. SOLUTION: A nearly circular fiber housing section 11 for winding and housing the extra length parts of the connected fibers and a bevel part 11A are disposed above an extra length housing body 10 formed on a cylinder. The optical submarine cables A, B are anchored from both sides of the extra length housing body 10 and the lead out fibers are derived outside from a slit- like aperture 13. After the ends thereof are connected to each other, the ends are reinforced by the juncture 2. The juncture 2 and the connected extra length parts of the fibers are wound and fixed to the outer periphery of the fiber housing body 11 and the extra length housing body 10.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for accommodating a surplus length of optical fiber connection at an optical fiber connection portion of a multi-core optical fiber submarine cable.

[0002]

2. Description of the Related Art When a multi-fiber optical fiber submarine cable is connected in a connection box or the like, it is necessary to process a connection extra length portion of the connected optical fiber so as not to impair transmission characteristics. FIG. 3 is a side view of a repeater and a top view of a tray showing an example of a conventional method of accommodating an extra fiber splicing length. That is,
In the optical fiber submarine cables (A) and (B) introduced from both sides of the connection box, first, the strength members of the cables are fastened to the fastening terminals 9A and 9B on both sides of the stay 9, and the submarine cables are pulled out from the detention terminal portions. Multiple fiber groups 1,
1'is connected to each other with an extra length, and the connecting portion is reinforced with a connecting reinforcing material to form a reinforcing portion 2. The reinforcing portion 2 is fixed to the fixing plate 4, and the extra connecting length of the fiber is overlapped. Upper surface 5 of several tray type extra length storage bodies 3 to be arranged
Was placed in the tray-type extra length storage 3 so that the fibers wound around the stoppers 6 and 6A would not come off.

[0003]

When the above tray type extra length storage 3 is used, the length of the connecting portion 2 of the fiber, which is the rigid portion, and the minimum curvature from the rigid portion are ensured to ensure the extra length. Since the fiber is wound and stored in the tray type extra length storage body 3, and the cable holding portions 9A and 9B for holding the submarine cables are located on both sides of the tray type extra length storage body 3, the total length of the fiber connecting portion is Has the drawback of being long. When the extra length storage part of the connection part is lengthened in this way, the total length of the repeater or the cable joint box part is also lengthened, so that the mechanical characteristics of the connection part and the bending property when the cable is wound around a drum are deteriorated. Occurs.

[0004]

In order to solve the above-mentioned problems, the present invention inserts and retains a multi-core optical fiber submarine cable to be connected so as to face the inside of the extra length housing.
The optical fiber connecting portion of the cable is fixed to the side wall of the outer wall of the extra length container, and the extra length of the optical fiber is wound around the fiber accommodating portion located above the outer wall, and the extra length of the wound fiber is attached to the outer wall of the extra length container. By fixing the optical fiber along the side, it is possible to reduce the size of the extra length storage portion of the optical fiber.

[0005]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 (a) is a perspective view of a multi-fiber optical fiber connection extra length accommodating body according to the present invention, and FIG. 1 (b).
Shows a cross section of the extra length storage body. The extra length accommodating body 10 is formed in a cylindrical shape as a whole, and a fiber accommodating portion 11 for accommodating and accommodating the extra length portion of the connected fiber is provided on a part of the outer surface above the extra length accommodating body 10. An umbrella portion 11A is attached above the fiber storage portion 11 so that the stored fibers do not jump out apart.

The optical submarine cables A and B have their tensile strength members held inside the extra length housing 10 by the holding portions 12 and 12. Then, several optical fibers pulled out from the fiber unit of the optical submarine cable held by the holding portions 12, 12 are provided from the inside of the extra length storage body 10 to the side portion of the extra length storage body 10. Is drawn out through the slit-shaped elongated hole (opening) 13 (13 '),
The fibers are mechanically protected by the connecting sleeve. Then, as will be described later, the connecting portion 2 is fixed to one or more fixing grooves 14 (14 ') formed in the side wall of the extra length storage body 10.

The shapes of the outer peripheral wall of the extra length container 10 and the outer periphery of the fiber housing group 11 have a curvature and dimensions that can ensure the minimum allowable radius of curvature of the fiber. The procedure for connecting the extra length of the optical fiber to the extra length storage body 10 and storing it will be described with reference to FIG.
It will be described in (b), (c), (d) and (e).

(A) is a fiber group 1, 1'pulled out from the fiber lead-out opening 13 of the extra length housing 10 by mutual fusion splicing, and the connecting portion is covered with a sleeve or the like to splice the connection reinforcement portion 2 Indicates the state. (B) shows a state in which the reinforced connecting portion 2 is brought to the back side and fitted and fixed in the fixing groove 14 of the connecting reinforcing portion formed on the outer wall of the extra length storage body 10. At this time, the extra length portion of the fiber remaining inside the extra length container 10 is pulled out a little from the opening 13. (C) shows that the extra length of one of the fibers 1 after being fixed in the fixing groove 14 is wound around the outer circumference of the extra fiber length storage portion 11, and the extra length of the wound fiber 1 is kept while ensuring a minimum radius of curvature of 30 mm. The state where it has fixed along the outer periphery of the long storage part 10 is shown. (D) shows the remaining length of the other fiber 1'after being fixed in the fixing groove 14
A situation is shown in which the fiber is wound around the outer circumference of the excess fiber length storage portion 11 from the opposite direction to the above case, and the extra winding length is fixed along the outer circumference of the excess length storage body 10. (E) is the opening 13 ′ on the opposite side (back side) of the extra length storage body 10 for the second fiber.
When the connection reinforcing portion 2 ′ is wound around the opposite side and fixed in the fixing groove 14 ′ and then wound around the extra fiber length storing portion 11 and fixed in the same manner as in the above (c) and (d). Show.

By such work, the extra length storage body 10
The connection and storage work for all of the plurality of optical fibers that have been pulled out from both sides is completed. After the excess lengths of all the optical fibers are stored around the excess length storage body 10, the excess length storage body is fixed in the connection box, and the connection length processing of the submarine optical cable is completed.

[0010]

According to the method for accommodating the extra length of the multi-fiber optical fiber connection portion of the present invention, the optical fiber cable is attached so that the detention portions of the opposing optical fiber cables can be fixed in the extra length accommodation body, and the optical fiber pulled out after the submarine cable is retained. , And its connection extra length are mainly wound around the circular fiber accommodating portion located above the extra length accommodating body, so that the entire length of the extra length accommodating body can be short. As a result, the rigid cable connection portion is shortened, and its mechanical characteristics (bending characteristics) are improved.

[Brief description of drawings]

FIG. 1 shows a perspective view and a sectional view of an optical fiber extra length storage body of the present invention.

FIG. 2 is an explanatory diagram showing a state in which a connection extra length of the optical fiber of the present invention is stored.

FIG. 3 is a side view and a tray top view showing the inside of a conventional optical fiber connection extra length storage device.

[Explanation of symbols]

 A, B optical fiber submarine cable, 1, 1'optical fiber group, 2, 2'optical fiber connection reinforcing part, 10 extra length storage body, 11 optical fiber extra length storage part, 13 opening part, 14 fixing groove,

Claims (2)

[Claims] 1. A multi-core optical fiber submarine cable to be connected is inserted and retained oppositely from both sides of a cylindrical extra length container, and an optical fiber of the submarine cable is led out from an opening of the extra length container. Along with connecting to each other, the connection reinforcing portion is fixed to the outer wall side surface of the extra length accommodating body, the optical fiber extra length is wound around the fiber accommodating portion located above the extra length accommodating body, and further the wound fiber A method for accommodating a surplus length of a multi-fiber optical fiber connecting portion, characterized in that the surplus length is fixed along the outer circumference of the surplus length accommodating body. 2. The curvature of the cylindrical extra length housing and the curvature of the outer circumference of the fiber housing are set so as not to be smaller than the minimum allowable curvature of the optical fiber. Method for storing extra length of multi-fiber optical fiber connection part.