JPH1164697A - Fiber cord separating part of multiple coated optical fiber ribbon - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make it possible to enhance the strength of a separating part, to improve a temp. characteristic and to make handling easy even if the number of coated fibers increases by exposing the coated fiber ribbon of the separating part, separating the coated fiber ribbon to one piece each, fixing the coated fibers to a package base, packing an adhesive into the internal space thereof and adhering and fixing the coated fibers. SOLUTION: The required length of a protective tube 2 for the coated fiber ribbon is removed to expose the coated optical fiber 1. This coated optical fiber 1 is separated to four pieces of single core coated optical fibers 3. Four pieces of the separated single core coated optical fibers 3 are protected by putting the protective tubes 4 for the single core optical fibers respectively thereon. These fibers are installed on the package base 8 and the silicone based adhesive 7 is poured into the internal space 13 of the package base 8. The coated optical fiber 1 and four pieces of the separated single core coated optical fibers 3, etc., are adhered and fixed in the package base 8 by this adhesive 7. Finally, a package cover 9 is attached with screws 10.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a single-core separating section of a multi-core optical fiber ribbon, and more particularly to a single-core separating section of a multi-core optical fiber ribbon connected to an optical module used for optical communication. is there.

[0002]

2. Description of the Related Art Optical modules used for optical communication include:
An optical fiber is connected to the input / output unit. When the amount of information handled by the optical module is small, the number of optical fibers connected to the input / output unit is one or several in a single core, but when the amount of information handled is large, it is connected to the input / output unit. The optical fiber is a multi-core optical fiber ribbon.

[0003] This multi-core optical fiber tape core has four cores,
It is appropriately selected from 8 cores, 16 cores and the like according to the purpose. When a multi-core optical fiber ribbon is connected to an optical module, the tip of the ribbon is usually separated into a single core and an optical connector or the like is attached.

FIG. 3 shows a single-fiber separating section (here, a case of four fibers) of a conventional multi-core optical fiber ribbon. The multi-core optical fiber tape core 1 is protected by a tape core protection tube 2. First, the tape core protection tube 2 is removed by a necessary length, and the multicore optical fiber tape core 1 is exposed. After the multi-core optical fiber ribbon 1 is divided into single-core optical fiber cores 3, the single-core optical fiber cores 3 are covered with single-core optical fiber protection tubes 4.

[0005] After that, although it depends on the environment to be used, for example, a heat-shrinkable tube is covered so as to cover the entire separation portion, and the process is completed. Alternatively, a multi-core optical fiber ribbon 1 and a single-core optical fiber core 3 separated from each other are fixed to a specific location from above the protective tube at locations close to the separated portions using a fixing jig or an adhesive. I do.

[0006]

In the conventional single-fiber separation section of a multi-core optical fiber ribbon, the strength of the separation section is so low that there is a fear of disconnection. Also, in the case where the number of optical fiber ribbons increases as the number of channels of the optical communication module increases (for example, more than 10 channels), the optical fibers that are separated into single fibers are handled by being entangled with each other. However, it was inconvenient and there was a fear of disconnection.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to solve the above-mentioned problems of the prior art, and to provide a multi-core light which has a strong separation portion, good temperature characteristics, and is easy to handle even if the number of cores is increased. An object of the present invention is to provide a single-core separating portion of a fiber ribbon.

[0008]

In order to achieve the above object, the present invention provides a multi-core optical fiber tape in which a plurality of optical fibers are arranged and collected in a flat plate shape and a protective tube is covered on the outer periphery thereof. In the single-core separation section of the multi-core optical fiber ribbon, in which the wire is separated into individual single-core optical fiber cores, the required length of a protective tube for the multi-core optical fiber ribbon at the portion where the separation is performed. Remove to expose the tape core,
The exposed tape core was separated into individual single-core optical fibers and fixed to a package base, an internal space in the package base was filled with an adhesive, and a cover was attached to the package base. It is characterized by the following.

In addition, a protective tube is put on the separated single-core optical fiber, and the protective tube for the single-core optical fiber and the protective tube for the multi-core optical fiber are respectively It is also possible to hold the protection tube to the package base and fix it by sandwiching it between the holding plate and the package base.

[0010] Further, a void not filled with an adhesive may be provided in the internal space in the package base.

[0011]

FIG. 1 is a perspective view illustrating an embodiment of a single-core separating section of a multi-core optical fiber ribbon according to the present invention. In this embodiment, the four-core optical fiber ribbon 1 is described, but the present invention is not limited to four cores.

The optical fiber ribbon 1 is covered and protected by a tape protective tube 2. First, the necessary length of the protective core wire 2 is removed to expose the optical fiber ribbon 1. Then, the tape 1 is separated into four single-core optical fibers 3. Each of the four separated single-core optical fiber core wires 3 is covered and protected by a single-core optical fiber protection tube 4.

These members are installed on a package base 8 as shown in FIG. The tape core protection tube 2 is fixed to the package base 8 by a tape core protection tube holding plate 5 and screws 10. Similarly, the single-core optical fiber protection tube 4 is fixed to the package base 8 by a single-core optical fiber protection tube holding plate 6 and screws 10. Unnecessary portions in the package base 8 are cut off from the tape-core protection tube 2 and the single-core optical fiber protection tube 4.

The internal space 1 of the package base 8
3, a silicone-based adhesive 7 (in this embodiment, SE9176L made by Toray Silicone is used) is poured. In the package base 8, the optical fiber tape 1, the separated four single-core optical fibers 3, the protective core 2 for the tape core, and the four single-core optical fibers are protected by the adhesive 7 in the package base 8. The tube 4 is adhesively fixed. Finally, the package cover 9 is attached with the screws 10.

Further, at the outlet of the package base 8 for single-core separation of the optical fiber ribbon 1 and the protective tube 2 for the tape, a rubber boot 1 for the optical fiber ribbon is provided.
1 (elastic body) is slid in the direction shown by the arrow in FIG. Similarly, a single-core optical fiber core wire 3 and a single-core optical fiber protection tube 4
At the outlet of the package base 8, the rubber boot 12 (elastic body) for a single-core optical fiber is slid in the direction of the arrow to be fixedly adhered to the package base 8.

The internal space 1 in the package base 8
Although the silicone-based adhesive 7 is poured into 3, it is preferable that a small gap (not shown) is left instead of being poured into the entire internal space 13 from the beginning. This is because if the internal space 13 is completely buried, the silicone adhesive 7 expands and overflows from the package cover 9 when the temperature changes (particularly at high temperatures), or the single-core optical fiber core 3 breaks. It is because they do. The location where this gap exists is not particularly limited, but is preferably a side wall portion inside the package base 8.

The above adhesive has fluidity,
After curing, a silicone-based adhesive having a low elastic modulus and a small change in the elastic modulus due to a temperature change was used, but without applying stress to the single-core optical fiber core wire 3 and having excellent temperature characteristics. As a result, a single-core separation portion of the multi-core optical fiber ribbon is obtained. However, an adhesive having the same physical characteristics may not be a silicone-based adhesive.

FIGS. 2A and 2B are explanatory diagrams showing a temperature characteristic test of the single core separation part of the present invention. FIG. 2A shows a test temperature cycle, in which the horizontal axis represents time (h) and the vertical axis represents test temperature. (° C.). (b) shows the loss fluctuation (dB), and the insertion loss at the start of the test is used as a reference (0 dB). The test results are
Loss variation 0.0 in the temperature range of -40 ° C to 75 ° C
It shows excellent temperature characteristics of 1 dB or less.

In the above-described embodiment, an example is shown in which a bundle of optical fiber ribbons 1 is separated in the package base 8, but a plurality of optical fiber ribbons 1 can of course be separated. It is.

Further, by providing a screw hole or the like for mounting the substrate on the package base 8, the optical module can be mounted on a printed circuit board or the like together with the optical module, which is effective for routing and fixing the optical fiber cord.

[0021]

According to the present invention, the strength of the separation portion is high,
It is possible to obtain a single-fiber separation part of a multi-core optical fiber ribbon which has good temperature characteristics and is easy to handle even if the number of cores increases.

[Brief description of the drawings]

FIG. 1 is a perspective view showing one embodiment of a single-fiber separating section of the present invention.

FIGS. 2A and 2B are explanatory diagrams showing a temperature characteristic test of a single core separation part of the present invention, wherein FIG. 2A shows a test temperature cycle and FIG.

FIG. 3 is a perspective view showing a conventional single core separation unit.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Optical fiber ribbon 2 Protective tube for tape 3 Single-core optical fiber 4 Protective tube for single-core optical fiber 5 Protective tube retainer for tape 6 Protective tube retainer for single-core optical fiber 7 Silicone Adhesive 8 Package base 9 Package cover 10 Screw 11 Rubber boot for optical fiber ribbon 12 Rubber boot for single core optical fiber 13 Internal space

Claims (3)

[Claims] 1. A multi-core optical fiber ribbon in which a plurality of optical fibers are arranged and assembled in a flat plate shape and a protective tube is covered on the outer periphery thereof to form a single-core optical fiber ribbon. In the single-core separation part of the separated multi-core optical fiber tape, the necessary length of the protective tube of the multi-core optical fiber tape at the part to be separated is removed to expose the tape.
The exposed tape core was separated into individual single-core optical fibers and fixed to a package base, an internal space in the package base was filled with an adhesive, and a cover was attached to the package base. A single-core separating section of a multi-core optical fiber ribbon. 2. A protective tube is put on the separated single-core optical fiber core, and a protective tube for the single-core optical fiber core and a protective tube for the multi-core optical fiber tape are respectively provided. 2. The single-core separating section of a multi-core optical fiber ribbon according to claim 1, wherein the single-core separating section is sandwiched between a holding plate for fixing the protective tube to the package base and the package base and is adhesively fixed. 3. The single-fiber separation section of a multi-core optical fiber ribbon according to claim 1, wherein a void not filled with an adhesive is provided in an internal space in the package base.