JPS5930898Y2 - Optical fiber cable connection - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a connecting portion of an optical fiber cable.

Conventionally, when connecting optical fiber cables, in order to simplify the connection work and reduce the tension applied to the connection part, it is necessary to connect the optical fibers from both cables to make corrections in case a misconnection is discovered. The extra length will be exposed,
This optical fiber was connected.

The connecting portion of the optical fiber is protected by covering the outer periphery with a protective sleeve that fits over both ends of the cable.

By the way, the extra length of the connected optical fiber is stored in a messy state inside the protective sleeve, and if the extra length of the optical fiber is in such a state, the optical fiber may make a small bend in the housing. As a result, the optical fiber becomes damaged, or even if it is not damaged, the transmission loss of the optical fiber increases due to effects such as microbending.

Moreover, if an attempt is made to avoid this small bend in the optical fiber, the connecting portion of the cable will become larger, resulting in the disadvantage that the space for laying the cable becomes larger.

If the optical fibers are stored in a messy state inside the sleeve, it will take time to sort the optical fibers and there is a risk of damaging the optical fibers when reconnecting due to incorrect wiring or changing the wiring after connection. There will also be more.

In view of the above-mentioned points, the present invention has been developed to create an optical fiber cable connection part that is compact, has no limit on the extra length, has little increase in optical fiber transmission loss, is mechanically stable, and can be easily worked on site. In this invention, the remaining length of the optical fibers connected to each other is formed into a bundle including a connecting part of the optical fibers consisting of at least two loops, and several bundles are fixed to the connecting part of said optical fibers. between the core cylinder body and the second cylinder body that covers the outer periphery of the core cylinder body with a gap therebetween, and
A connection part for an optical fiber cable, which is housed in a state inscribed in a cylindrical body.

Hereinafter, the present invention will be explained based on drawings showing embodiments thereof.

FIG. 1 is a perspective view for explaining a connecting portion of an optical fiber cable according to the present invention, and FIG. 2 is a diagram showing a fixed state of the connecting portion of an optical fiber.

In the figure, FC and FC' are optical fiber cables to be connected.
A protective sleeve S, which serves as a second cylindrical body and has a slit SS in the axial direction, is inserted into the cable FC' in advance.

A spacer 3, 3' for a protective sleeve S is attached to each cable end of the housing.

Then, the outer covering of the ends of the cables FC and FC' is stripped off over a required length, and the optical fibers F and ¥ are exposed beyond the extra length.

In addition, the cables FC and F exposed together with the optical fibers are
In a composite cable with a tension member C' or an electric cable, the electric cable conductors TM and TM' are welded,
A myocardial body 2 connected by a method such as crimping or gluing to fix the connecting portion 1 of the optical fibers F and F′ to the outer periphery of the connecting portion of the tension member or the electric cable conductors TM and TM′.
will be placed.

The exposed remaining lengths of the optical fibers F 1 and F' to be connected are looped once each, and the ends of the optical fibers F 1 and F' are connected to form a connection part 1 .

At this time, the remaining lengths of both optical fibers may be different.

If the extra length is extremely long, it may be made into two or more loops, and the extra length of each optical fiber F, F' is used as at least one loop, and the extra length of both fibers is used as an optical fiber consisting of at least two loops. A bundle containing the connection part 1 is formed.

By forming at least one loop with the extra length of each optical fiber before connecting the optical fibers, it is possible to adjust the loop size of each optical fiber individually, and it is possible to adjust the loop size of each optical fiber individually. The connection position of the optical fiber can be selected so that the connection part 1 of the optical fiber can be fixed at a predetermined position.

After the connecting portion 1 is located at a predetermined position on the myocardial body 2, the connecting portion 1 is stopped on both sides along with the extra length of the bundled optical fiber including the optical fiber connecting portion 1 consisting of two or more loops. Fix with tools 4, 4.

By winding the bundle consisting of the extra length onto the myocardial body 2, the outside of the extra length of the optical fiber can be kept in an orderly state.

After winding, the optical fiber is held down with a string or tape to prevent it from returning due to the repulsive force of the optical fiber.

Next, position the protective sleeve S with the slit SS, which has been inserted through the cable FC', to cover the outer periphery of the myocardial body 2! to move it and fix it to the spacers 3, 3'.

Next, the string or Qi 7 holding the optical fiber is pulled out from the slit SS, and the repulsive force of the optical fiber causes the bundle that was wound around the myocardial body 2 to be moved to the inner surface of the protective sleeve S (second cylindrical body). The optical fiber is wound around the myocardial body 2 without being constrained while being inscribed with a large radius in the myocardial body 2 .

Instead of using the protective sleeve S that has been inserted into the optical fiber cable FC' as the second cylinder, it is possible to wrap the plastic sheet across the spacer 3゜3'. It becomes easier to pull out the string or tape from the end.

Furthermore, when using a plastic protective sleeve or plastic sheet, it is more preferable to use transparent plastic, as this makes it possible to observe the inside.

After the bundle is wound in a state inscribed in the second cylindrical body in this manner, a protective coating, which is currently used in the connection method of copper wire communication cables, can be applied to the outer periphery of the bundle, if necessary.

According to the connecting section of the present invention, by making the outside of the optical fiber into a bundle consisting of at least two loops, the size of the optical fiber loops to be connected can be adjusted individually, and the optical fiber connection It is now possible to fix part 1 at a pre-planned location on the two circumferences of the myocardium without being limited by the length of the extra length, etc., and the connection part of the optical fiber and the outside of the extra length can be neatly placed inside the protective sleeve. It can be delivered in good condition.

In addition, as a method for processing the excess length, the excess length is made into a bundle consisting of at least two loops, and several bundles are wound around the circumference of the myocardial body, so the connection part can be made compact, and the optical fiber does not have excessive bends. There is no increase in transmission loss due to optical fiber damage, microbending, etc.

Furthermore, since the optical fiber connection part can be fixedly placed at a predetermined position on the six tubes, it is easy to reconnect in the event of an incorrect connection or change the connection after connection, and the connection is mechanically stable. The department will be obtained.

In addition, since the bundle of extra length of the optical fiber is housed between the myocardial body 2 and the second cylinder with a large radius inscribed on the inner surface of the second cylinder, the optical fiber is There is no restriction on

Therefore, even if, for example, the second cylindrical body and the optical fiber have different coefficients of thermal expansion, they will not be adversely affected by the rate of increase in transmission loss due to temperature changes.

[Brief explanation of the drawing]

FIG. 1 is a perspective view for explaining a connecting portion of an optical fiber cable according to the present invention, and FIG. 2 is a diagram showing a predetermined state of the connecting portion of an optical fiber. FC and FC' are optical fiber cables, F and F' are optical fibers, 1 is an optical fiber connection, 2 is a core cylinder, and S is a second cylinder.

Claims (1)

[Scope of utility model registration request] The remaining lengths of the mutually connected optical fibers are formed into a bundle including a connecting portion of the optical fibers, which is made up of at least two loops, and the bundles are formed into a bundle including a connecting portion of the optical fibers, and a core tube body that fixes the connecting portion of the optical fibers, and an outer periphery of the core tube body. A connection portion for an optical fiber cable, characterized in that the optical fiber cable is housed between the fiber and a second cylindrical body covering the fibers with a gap therebetween, and inscribed in the second cylindrical body.