JP3273603B2 - Fixing structure for multi-core optical fiber and manufacturing method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a multi-fiber optical fiber fixing structure for connecting a plurality of optical fibers together, and a method of manufacturing the same .

[0002]

2. Description of the Related Art For example, in an optical fiber communication system, an optical connector is used as a fixing structure for connecting optical fibers. As this optical connector, a multi-core optical connector in which a plurality of optical fibers are collectively joined together in addition to a single-core optical connector is known. FIG. 3 shows a configuration of a general multi-core optical connector 2. By using the multi-core optical connector 2, the distal ends of a plurality of optical fibers 6 of a tape-shaped optical fiber cable 4 are collectively connected. Connected.

[0003] The multi-fiber optical connector 2 includes a pair of substrates 8 and a holding substrate 10, on which a plurality of V grooves 12 for arranging and accommodating a plurality of optical fibers 6 are formed. In addition, a housing groove 14 for arranging the covering portion 13 of the optical fiber cable 4 in communication with the end of the V groove 12
Is provided. On both sides of the V-shaped groove 12, first groove portions 16 for holding guide pins (not shown) and positioning the substrates 8 with each other are formed. On the other hand, the holding substrate 10 has a receiving groove 1 corresponding to the receiving groove 14 of the substrate 8.
8 and a second groove 20 corresponding to the first groove 16 are formed.

In such a configuration, the V-groove 1 of the substrate 8
In a state where the optical fiber 6 is disposed on the optical fiber cable 2 and the covering portion 13 of the optical fiber cable 4 is disposed in the accommodation groove 14, the holding substrate 10 is superimposed on the substrate 8, and this substrate 8 and the holding substrate 10 , The covering portion 13 and the optical fiber 6 are integrally fixed. The multi-fiber optical connector 2 is positioned by a guide pin (not shown) that is inserted into the first and second grooves 16 and 20 integrally.
The end faces of the optical fibers 6 are connected.

[0005]

By the way, in the multi-fiber optical connector 2, it is necessary to reduce as much as possible the connection loss due to the misalignment of each optical fiber 6 and the change in the connection loss due to the temperature change. Therefore, the substrate 8 and the holding substrate 10
Is composed of ceramic, and the ceramic substrate 8 has V
It is conceivable that the grooves 12 and the first groove portions 16 are processed with high precision, and the second groove portions 20 are processed with high precision in the ceramic holding substrate 10.

However, when processing the substrate 8, first, a V-groove 12 is formed over the entire upper surface of the substrate 8,
Next, an accommodation groove 14 is provided by removing one upper end side of the substrate 8 corresponding to the portion accommodating the covering portion 13. For this reason, the V-groove 12 must be formed in the substrate 8 to an unnecessary portion. In particular, when the substrate 8 is made of a ceramic that requires a high processing cost, the substrate 8
However, there is a problem that the processing cost of the optical fiber connector 2 rises considerably and the whole multi-core optical connector 2 becomes expensive.

SUMMARY OF THE INVENTION The present invention solves this kind of problem, and is capable of connecting a plurality of optical fibers with high accuracy and effectively reducing costs. It is intended to provide a structure and a manufacturing method .

[0008]

In order to achieve the above-mentioned object, a multi-core optical fiber fixing structure according to the present invention comprises a ceramic substrate having a V-groove for accommodating a plurality of optical fibers in an aligned manner; A holding substrate for holding the optical fiber in the V-groove, a first insertion portion for accommodating both the ceramic substrate and the holding substrate, and a second insertion portion for accommodating the coated portion of the optical fiber And a holding member provided with the first insertion portion, wherein the holding member is integrally formed, and openings are provided on both sides of a side surface portion of the first insertion portion, and a part of the opening portion is A second adhesive injection port, which is configured as a first adhesive injection port into the inside of the holding body and is connected to the second insertion section, is formed above the second insertion section of the holding body. It is characterized by being. Further, the fixing structure is inserted into the first insertion portion.
Bulging portion is formed between the ceramic substrate and the holding substrate.
It is characterized by being provided respectively . Further, in the method for manufacturing the fixing structure for a multi-core optical fiber according to the present invention, the optical fiber is inserted into the V-groove of the ceramic substrate holding the optical fiber.
Fiber insertion process and before the optical fiber is inserted
Disposing a holding substrate on the ceramic substrate, supporting the optical fiber at three points with the holding substrate and the V-groove, and holding the ceramic substrate in a state where the holding substrate is placed on the holding substrate; a step of inserting the first insertion portion, prior <br/> Symbol light inserting a coated portion in the second insertion part of the holder of the fibers, the first adhesive holding member inlet and the second adhesive inlet More resin-based adhesive, ceramic substrate,
Fixing the holding substrate and the optical fiber together in the holding body.

In the above-described fixing structure for a multi-core optical fiber and the method of manufacturing the same according to the present invention, since the substrate relating to the positioning accuracy of each optical fiber is made of ceramics, connection loss and temperature change are caused. The change of the connection loss can be prevented as much as possible. Furthermore, less the portion that does not require precision, for example, a portion for accommodating a covered portion of the optical fiber by providing the holding body made of a resin material or metal, it is possible to effectively reduce the processing costs, the entire fixing structure Can be easily reduced.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A fixing structure for a multi-core optical fiber and a method for manufacturing the same according to the present invention will be described in detail below with reference to the accompanying drawings.

[0011]

[0012]

[0013]

[0014]

[0015]

[0016]

[0017]

[0018]

[0019]

[0020] Figures 1 and 2 show a multi-fiber optical fiber fixing structure 80 according to the implementation of the embodiment of the present invention.

The fixed structure 80 is connected to a light receiving element, a light emitting element, an LN (lithium niobate) waveguide, or the like.
4 and a plurality of optical fibers 88 of the optical fiber cable 86.
And a resin body 92 serving as a holding body.

The substrate 84 and the holding substrate 90 are provided with bulging portions 94 and 96 facing each other.
A first insertion portion 98 capable of accommodating the bulging portions 94 and 96;
A second insertion portion 102 is provided, one end of which communicates with the first insertion portion 98 and the other end of which is open to the outside, and in which the covered portion 100 of the optical fiber cable 86 can be accommodated. In the resin body 92, first adhesive injection ports 104a and 104b communicating with both sides of the first insertion section 98 and a second adhesive injection port 106 communicating with the second insertion section 102 are formed.

In the fixing structure 80 configured as described above,
After the optical fiber 88 is provided in the V-groove 82 of the substrate 84, the holding substrate 90 is superposed on the optical fiber 88. For this reason, the optical fiber 88 is supported at three points by both wall surfaces constituting the V-groove 82 and the flat surface of the holding substrate 90, and in this state, the bulging portions 94 and 96 are formed by the first portions of the resin body 92.
At the same time as being inserted into the insertion portion 98, the covering portion 100 of the optical fiber cable 86 is provided in the second insertion portion 102. Then, the adhesive is supplied from the first adhesive inlets 104a and 104b, and the bulging portions 94 and 96 are fixed in the first insertion portion 98 of the resin body 92. On the other hand, when the adhesive is supplied from the second adhesive injection port 106, the covering portion 100 is fixed in the second insertion portion 102, and the optical fiber 88 is fixed in the V groove 34.

[0024] In the implementation of the form of this, V which accuracy is required
The substrate 84 in which the groove 82 is provided and the pressing substrate 90 are made of ceramics, and the other parts are provided in the resin body 92. Therefore, an effect is obtained that the processing cost of the entire fixing structure 80 can be reduced. In addition, the first adhesive injection holes 104a and 104b and the second
Since the adhesive inlet 106 is provided, a desired portion can be smoothly filled with the adhesive, and the entire fixing structure 80 can be firmly fixed.

In the embodiment according to the present invention, the resin body 92 is used as the holder, but a metal can be used instead. Metals are less affected by the environment in which they are used, and in particular, pollution due to gas generation and the like can be avoided.

[0026]

According to the present invention, a fixing structure for a multi-core optical fiber according to the present invention.
According to the method and the method for manufacturing the same , the following effects can be obtained.

The substrate relating to the positioning accuracy of each optical fiber is made of ceramic, while a portion not requiring much accuracy, for example, a portion for accommodating the coated portion of the optical fiber is provided on a holding body made of resin or metal. ,
Expensive ceramic processing can be minimized to effectively reduce processing costs, and the manufacturing cost of the entire fixed structure can be easily reduced.

[Brief description of the drawings]

1 is an exploded perspective view showing main components of a multi-fiber optical fiber fixing structure in accordance with the implementation of the embodiment of the present invention.

FIG. 2 is a vertical side view of a fixing structure according to the embodiment .

FIG. 3 shows a conventional multi-core optical fiber fixed structure, multi-core light.
FIG. 3 is an exploded perspective view of a main part of the connector.

[Description of Signs] 80 : Fixed structure 82: V-groove 84: Substrate 86: Optical fiber cable 88: Optical fiber 90: Holding substrate 92: Resin bodies 98, 102
... Insertion portions 104a, 104b, 106 ... Adhesive injection port

Continuation of front page (72) Inventor Shinji Nagasawa 1-6-1, Uchisaiwaicho, Chiyoda-ku, Tokyo Nippon Telegraph and Telephone Corporation (56) References JP-A-3-179405 (JP, A) JP-A-63- 81410 (JP, A) JP-A-3-61916 (JP, A) JP-A-1-219806 (JP, A) JP-A-4-29105 (JP, A) JP-A-3-35505 (JP, U) 1-77606 (JP, U) (58) Field surveyed (Int. Cl. ⁷ , DB name) G02B 6/38

Claims (3)

(57) [Claims] A ceramic substrate having a V-groove for accommodating a plurality of optical fibers aligned therein; a holding substrate for holding the optical fiber with respect to the V-groove; A holding member provided with a first insertion portion accommodating the holding substrate and a second insertion portion accommodating the coated portion of the optical fiber, wherein the holding member is integrally formed; Openings are provided on both sides of the side surface of the insertion portion, and a part of the opening is configured as a first adhesive injection port into the inside of the holding body. A fixing structure for a multi-core optical fiber, wherein a second adhesive injection port communicating with the second insertion portion is formed at an upper portion of the second insertion portion. 2. The fixing structure according to claim 1, wherein
(1) A fixing structure for a multi-core optical fiber, wherein a bulging portion inserted into the insertion portion is provided on each of the ceramic substrate and the pressing substrate. Wherein the ruse ceramic substrate made to hold the optical fiber
Inserting an optical fiber into the V-groove , arranging a holding substrate on the ceramic substrate into which the optical fiber has been inserted, and supporting the optical fiber at three points with the holding substrate and the V-groove; a step of inserting the ceramic substrate to the first insertion portion of the holding member in a state in which the pressing board is plus, inserting a covered portion of the front Symbol optical fiber to the second insertion portion of the holding member, the holding member Supplying a resin-based adhesive from the first adhesive injection port and the second adhesive injection port to collectively fix the ceramic substrate, the holding substrate, and the optical fiber inside the holder. Manufacturing method of a fixed structure for a multi-core optical fiber.