JP2598745Y2 - Multi-core optical fiber assembly - 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-core optical fiber assembly which is connected to a semiconductor device such as a light receiving or light emitting element assembly or a photoelectric converter.

[0002]

2. Description of the Related Art Conventional V-block multi-core fiber assembly 11
In FIG. 6, a fiber 103 is placed on a V-shaped groove 101 of a ceramic V-block 102 in which a plurality of V-shaped grooves 101 are engraved in parallel, as shown in FIG. Cover the fiber 103 with V-block 102 and lid 104
And the fiber 103 was fixed with the adhesive 105. In addition, a V block 10 is used for joining to other metal members.
2 Metallize 106 on the side of lid 104
3 is an optically polished surface 107.

[0003] The V-groove 101 of the V-block 102 has a very high groove pitch and degree of alignment, and the groove pitch and degree of alignment are often required to be ± 0.001 mm or less for SM fibers. A metallization 106 was applied to the outer periphery and fixed using solder at the time of assembling into a package. This precision enables the pitch and the degree of alignment of the fiber 103 to be equal to the pitch and the degree of alignment of the V-groove 101 by bringing the fiber 103 into close contact with the V-groove 101 and obtaining the alignment of the fiber 103.

[0004] In the case of bonding and assembling, in a high temperature range in a manufacturing process such as assembly into a package, the pitch and the degree of alignment of the fiber are changed. Therefore, solder is used instead of the adhesive. The metallization is performed on the V-groove of the block, and the fiber placed on the V-groove is also metallized and assembled. The place where metallization is applied
Since the plating thickness is partially varied, the pitch and the degree of alignment of the fiber do not match the pitch and the degree of alignment of the V-groove after assembly. This variation in plating thickness is 10 μm or more in total for the V block and the fiber metallization, and the precision of the V groove is wasted.

[0005]

SUMMARY OF THE INVENTION In a V-block multi-core fiber assembly to which metallization is applied in advance and then soldering is performed, the pitch of a plurality of V-grooves which are processed into a V-block and which are engraved in parallel and have a high precision is provided. It is required that the degree of alignment be high even after soldering.

[0006]

SUMMARY OF THE INVENTION In view of the above circumstances, the present invention provides a high-precision V-groove processed into a V-block, and the pitch and alignment of the V-grooves formed in parallel are highly accurate even after soldering. An optical fiber is placed on the V-groove of a V-block in which a plurality of V-grooves are engraved in parallel, and the V-block is covered with a lid so as to sandwich the optical fiber, and the lid is fixed to the V-block. A multi-core optical fiber assembly comprising: a tip of an optical fiber protruding from an end face of a V-block and a lid; and a metallized portion on a protruding portion of the optical fiber and an end face of the V-block and the lid on a protruding side of the optical fiber. Then, this portion was soldered to obtain a multi-core optical fiber assembly.

[0007]

According to the present invention, the optical fiber is set so as to protrude from the end surfaces of the V block and the lid, and the protruding portion of the optical fiber and the end surfaces of the V block and the lid on the protruding side of the optical fiber are metallized, respectively. Since this portion is soldered, it is possible to provide a high-precision optical fiber pitch and alignment degree with a multi-core fiber assembly, and it is possible to perform a highly reliable hermetic sealing by joining by soldering. it can.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail below with reference to specific embodiments shown in the accompanying drawings. As shown in FIG. 1, this multi-core optical fiber assembly 10 has a plurality of high-precision V-grooves 1 engraved on one surface of a V-block 2 in parallel, and optical fibers 3 protrude from the coating in parallel. The optical fiber 3 of the multi-core fiber array 11 is placed in the V groove 1, and the optical fiber 3 is sandwiched between the V block 2 and the lid 4.

A light-receiving or light-emitting assembly 12 is disposed opposite the multi-core optical fiber assembly 10. This light receiving or light emitting element assembly 12 includes an array 13 of light receiving or light emitting elements,
A lens array 14 in front of an array 13 of light receiving or light emitting elements
And a carrier 15 on the rear surface of the array 13 of light receiving or light emitting elements.
And

As shown in FIG. 2, the multi-core optical fiber assembly 10 and the light-receiving or light-emitting element assembly 12 are put in a package 16 in a combination of the two, and the multi-core optical fiber assembly 10 is soldered. It is fixed at. Here, as shown in FIG. 3, the multi-core optical fiber assembly 10 has a multi-core fiber array 11 sandwiched and fixed between the V-block 2 and the lid 4. The material of the V block 2 and the lid 4 is ceramic, and alumina, zirconia, or the like is used.

In the multi-core fiber array 11, a plurality of fibers are arranged in parallel, and the optical fibers 3 protruding from the covering portion 18 are set to have a length protruding from the V groove 1 of the V block 2. On the upper surface of the V block 2, a plurality of V grooves 1 are engraved side by side. The pitch between the V-grooves 1 and the degree of alignment of the V-grooves 1 are processed with high precision. The degree of the precision determines the pitch and the degree of alignment of the optical fibers 3 of the multi-core optical fiber assembly 10.

A step 19 is formed at the rear of the V-block 2 so as to receive the coating 18 of the optical fiber 3. Further, the lid 4 is placed on the upper surface of the V-block 2 and the optical fiber 3 is formed in a size that can be sandwiched between the V-block 2 and the lid 4, and the rear part can receive the coating 19 of the optical fiber 3. Formed on the step 20 as described above.

The optical fiber 3 is placed on the V-groove 1 of the V-block 2, the covering 18 is placed on the step 19, and the cover 4 is
The optical fiber 3 is placed on the block 2, the step 20 receives the covering 11, and the V-block 2 and the lid 4 hold the optical fiber 3. At this time, in order to accurately hold the optical fiber 3 on the V-block 2, the V-block 2 and the lid 4 of the optical fiber 3 are used.
The metallization 21 is formed only on the portion protruding from the end face of the V-block 2 and the end face of the V-block 2 and the lid 4 on the protruding side of the optical fiber 3.
・ Apply 22 ・ 23. As metalized 21,22,23 materials, W
Alternatively, Mo-Mn or the like is used.

The optical fiber 3, V-block 2 and lid 4 as described above are assembled as shown in FIG. First, as shown in FIG. 4A, the optical fiber 3 is placed on the V-groove 1 of the V-block 2 with the metallized portion 21 protruding from the V-groove 1 and the covering portion 18 is placed on the step portion 19. . Lid 4
The optical fiber 3 is placed on the upper surface of the block 2, the covering portion 18 is received by the step portion 20, and the optical fiber 3 is held between the V block 2 and the lid 4.

Next, as shown in FIG. 4B, the portions where the optical fibers 3 protrude and are subjected to the metallization 21, 22, and 23 are fixed by soldering 24. Subsequently, as shown in FIG. 4 (c), an optically polished surface 25 is formed so that light can pass through the protruded portion of the optical fiber 3 to which the solder 24 has been soldered.
The gap between the V block 2 and the lid 4 is filled with an adhesive 26, and the covering portion is also fixed with the adhesive 26. The fixing with the adhesive 26 may be performed before the soldering 24.

With the above structure, the V-groove 1 of the V-block 2
In this state, the metallization is not applied, and soldering 24 is possible while maintaining the pitch and the degree of alignment of the V-groove 1. The pitch and the degree of alignment of the optical fiber 3 in the high temperature range are the same as the precision of the V-block 2. A highly reliable multi-core optical fiber assembly can be provided. As another embodiment, as shown in FIG. 5, a chamfer 27 is formed on the upper end corner of the V-block 2 and a chamfer 28 is formed on the lower end corner of the lid 4, so that the front end of the fiber 3 and the chamfer 27 are formed.・ 28 parts are metallized 21 ・ 22 ・ 23,
It can be soldered 24. The other points are exactly the same as in the above embodiment.

[0017]

According to the present invention, as described above, an optical fiber is placed on a V-groove of a V-block in which a plurality of V-grooves are engraved in parallel, and the V-block is covered so as to sandwich the optical fiber. A multi-core optical fiber assembly in which the lid is fixed to the V-block, the tip of the optical fiber is projected from the V-block and the end face of the lid, and the optical fiber protrudes;
Since the multi-core optical fiber assembly is obtained by metallizing the end faces of the V-block and the lid on the protruding side of the optical fiber and soldering this portion, the pitch and the degree of alignment of the V-grooves of the V-block are maintained. Thus, it is possible to provide a highly reliable multi-core optical fiber assembly in which the pitch and alignment of optical fibers in a high temperature range are in the same state as the accuracy of the V-block.

[Brief description of the drawings]

FIG. 1 is a perspective view of a V-block multi-core fiber assembly and a light receiving or light emitting assembly of the present invention.

FIG. 2 is a side view showing a state in which the V-block multi-core fiber assembly of the present invention and a light-receiving or light-emitting assembly are placed in a package and the V-block multi-core fiber assembly is fixed to the package by soldering.

FIG. 3 is an exploded perspective view of the optical fiber, the V-block, and the lid according to the present invention.

FIG. 4 is a three-side view showing an assembling process of the V-block multi-core fiber assembly of the present invention.

FIG. 5 is a longitudinal sectional view of a V-block multi-core fiber assembly according to another embodiment.

FIG. 6 is a perspective view of a conventional V-block multi-core fiber assembly.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... V groove 2 ... V block 3 ... Optical fiber 4 ... Lid 21 ・ 22 ・ 23 ... Metallized 24 ... Solder

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁶ , DB name) G02B ^6/ 04-6/08 G02B ⁶ /26-6/42

Claims (1)

(57) [Scope of request for utility model registration] 1. An optical fiber is placed on a V-groove of a V-block in which a plurality of V-grooves are engraved in parallel, and the V-block is covered with a lid so as to sandwich the optical fiber, and the lid is fixed to the V-block. A multi-core optical fiber assembly comprising: a tip end of an optical fiber protruding from an end face of a V-block and a lid; and a protruding portion of the optical fiber and an end face of the V-block and the lid on a protruding side of the optical fiber, respectively. A multi-core optical fiber assembly that has been metallized and this part is soldered.