JPS6259906A - Optical submarine branching device - Google Patents

Abstract

PURPOSE:To simplify structure and to facilitate factory assembly in an intermediate process by fitting a cable anchoring device to an external case and storing standard pressure-tight housings therein. CONSTITUTION:The external case 28 of a branching device for an optical submarine cable is formed of high-strength FRP and standard pressure-tight housing bodies 18 and 20 are arranged inside. Further, cable anchoring devices 26 provided with a cable pressure-tight storage part 24 where an optical fiber connection part 27 and a connection excessive-length part 29 are stored are fitted to the case 28. This branching device easily branches one optical submarine cable into two. Consequently, the structure is made extremely easy and the standard pressure-tight housing bodies 18 and 20 are used, so the factory assembly in the intermediate process is facilitated.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an optical submarine branching device for branching one optical submarine cable into two optical submarine cables underwater.

[Conventional technology] The optical submarine cable system connects multiple optical fibers through pressure-resistant pipes that also serve as power supply lines, and then connects optical submarine cables with tension-resistant wires and polyethylene coatings to each other at fixed distances. It consists of an optical submarine repeater that regenerates and relays the signals transmitted. The multiple optical fibers of this optical submarine cable are currently housed in units of two trees, one above the other, and more than six fibers, and it is possible to communicate mutually from one point to two or more other points, and for this purpose. Undersea branching equipment is used.

In addition, the branching device includes a power supply switching circuit and a regenerative relay circuit that, when one of the two submarine cables is disconnected, cuts off the power supply to that cable and continues the power supply to the other cable.

[Problems to be solved] Conventionally, optical submarine branching equipment has a power supply switching circuit and uses a relatively large vacuum relay due to the high voltage. Compare about 2
Needed twice as much packaging and containers. Therefore, in order to accommodate these circuits, it was necessary to use a large-diameter pressure casing. Conventionally, a submarine repeater and an optical submarine cable tying device have been connected by a connecting ring, but similarly, in an underwater branching device, as shown in FIG. was provided. The connecting link 12 and the branching shape are complicated and large parts. In addition, on the end face plate of the pressure-resistant structure 1O, there is a cable accommodating part 1 for accommodating the optical fiber connection part and the extra connection length.
Since it was necessary to attach two or more 4-pieces, the structure became even more complicated. This conventional optical submersible branching device 2 with integrated shell-resistant body is difficult to assemble in a factory due to its large weight, and is expensive because the shell portion is large and complicated. Further, due to the complexity of the structure, expansion to three or more branches is difficult. Furthermore, in the case of integrated
Because it was necessary to handle two submarine cables at the same time, including the connection links, it was extremely difficult to handle them onboard the laying ship.

The present invention has been made in view of the problems of the prior art described in L. By simplifying the structure, it facilitates factory assembly in the intermediate process, and also facilitates expansion of the number of branches, so that it can be installed onboard a ship. The purpose of the present invention is to provide an optical underwater branching device that can improve the efficiency of work.

Solution to Problem E] Therefore, in the present invention, in an optical submarine branching device for branching one optical submarine cable into two or more optical submarine cables, a container of an arbitrary shape and a container arranged in the container are provided. A configuration is adopted in which at least two or more pressure-resistant housings are provided, and at least two or more cable retaining devices each having a cable pressure-resistant accommodating portion for accommodating an optical fiber connecting portion and a connecting extra length portion are provided on the inner surface of the container. This aims to achieve the above objective.

[Example] Hereinafter, an example of the present invention will be described based on FIGS. 1 and 2.

FIG. 1 is a partial cross-sectional view of an optical underwater branching device 20 according to an embodiment of the present invention, and FIG. 2 is a side view of FIG. 1.

In this figure, reference numeral 28 indicates an external case as a container, and the external case is made of high-strength FRP and is divided into halves, which are connected by a port 31 and a nut 30.

Pressure-resistant housings 18.20 are arranged in parallel inside the external case 28, and a power supply switching circuit and a regenerative relay circuit are accommodated in the pressure-resistant housings 18.20.

The cable pressure-resistant accommodation section 2 is provided on the inner surface of the outer case 28.
As shown in the figure, cable anchoring devices 26 each having a number of cables 4 are arranged at three locations, and one optical submarine cable is branched into two optical submarine cables. The cable pressure accommodating section 2
4 has an optical fiber connection part 27 and an optical fiber connection extra length part 2.
9 is accommodated.

The pressure casings 18 and 20 have the same dimensions and structure as the optical submarine repeater.

A typical optical submarine cable has several to several dozen cables, □,
. 7, Yu□-7O1.4□2. □: It is easy to assemble in a factory because it is small and the equipment is standardized. Part shapes are also standardized. In the underwater branching device 4 in the above embodiment, since the heavy weight occurs in the final step, it is possible to assemble the intermediate step by a single method, which is almost the same as that for an optical submarine repeater. Furthermore, the FRP external case 28 has a simple structure and is easily expandable, and by adding a pressure-resistant housing, three or more cable branches can be easily realized. In addition, since the cable connection accommodating portion is independent for each anchoring device, it is possible to easily connect cable fibers and power supply lines independently.

[Effects of the Invention] According to the present invention configured as described above, the cable retaining device is attached to the container and the structure is such that a standard pressure-resistant body is housed inside, thereby facilitating factory assembly in the intermediate process. Since the parts are standardized, the economic effect can be increased, and the simple shape of the external case makes it easy to expand the number of branches.Furthermore, the cable anchorage device can be connected independently, making it easy to install onboard ships. This has the effect of making the connection work more efficient.

[Brief explanation of the drawing]

FIG. 1 is a partial cross-sectional view of an optical underwater branching device according to an embodiment of the present invention, FIG. 2 is a side view of FIG. 1, and FIG. It is a partial vertical cross-sectional view. 18.20: Pressure-resistant housing 24: Cable pressure-resistant accommodation section 26 Two cable retention devices 27: Optical fiber connection section 28: External case 29: Connection extra length section

Claims (1)

[Claims] An optical submarine branching device for branching one optical submarine cable into two or more optical submarine cables includes a container of an arbitrary shape, at least two or more pressure-resistant enclosures arranged in the container, an optical fiber connection part, and 1. An optical underwater branching device comprising: at least two cable anchoring devices each having a pressure-resistant accommodation portion for accommodating a connection excess length on the inner surface of the container.