JPH0530813U - Mounting structure of fusion fiber coupler - Google Patents

Abstract

(57) [Summary] [Structure] The fused fiber coupler is composed of a plurality of optical fibers 2.
The 0 and 30 cores are brought close to each other and heat-fused to form the fusion-bonded stretched portion 40. The first small piece plate 60 of quartz glass is fixed on the substrate 10 and both ends of the fusion-stretched portion 40 are placed. The second small piece plate 61 is fixed to the first small piece plate 60 with the adhesive 50 by sandwiching both ends of the fusion extending portion 40. [Effect] The production quality is stable and the adhesive strength is improved.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a mounting structure of a fusion fiber coupler that couples or branches optical signals propagating in an optical fiber.

[0002]

[Prior Art]

 2A and 2B are a plan view a and a side view b showing an example of a conventional fused fiber coupler mounting structure. In the conventional example, the cores of a plurality of optical fiber couplers 21 and 31 are brought close to each other and heat-fused to form a fusion stretched portion 41, and both ends of the fusion stretched portion 41 on a glass substrate 11. Are placed, and both ends of the fusion extending portion 41 are sandwiched and fixed by an epoxy adhesive 52.

[0003]

[Problems to be solved by the device]

 In the conventional fused fiber coupler mounting structure described above, the ends of the fusion spliced portion are fixed to the glass plate or other substrate with epoxy adhesive at both ends of the fused fiber, and the optical fiber is fixed with a mass of epoxy adhesive. However, the fixing strength depends on the amount of the adhesive, and especially when the amount of the adhesive is small, the fusion stretched part is bent due to changes in the operating environment temperature, etc., and the insertion loss and branching ratio vary. there were.

[0004]

[Means for Solving the Problems]

 The mounting structure of the fusion fiber coupler of the present invention includes a fusion fiber coupler in which cores of a plurality of optical fibers are brought into close contact with each other and heat fusion is performed to form a fusion extension part, and the fusion fiber coupler is fixed on the substrate and A first small piece plate on which both ends of the attachment / extension part are respectively placed; and a second small piece plate which is fixed by sandwiching both ends of the fusion extension part between the first small piece plate and an adhesive. ..

[0005]

【Example】

 Next, the present invention will be described with reference to the drawings. FIG. 1 is a plan view (a) and a side view (b) of an embodiment of the present invention.

In this embodiment, in the fusion fiber coupler, cores of a plurality of optical fibers 20 and 30 are brought close to each other and heat fusion is performed to form a fusion extension part 40. The first small piece plate 60 of quartz glass is fixed on the substrate 10 and both ends of the fusion-stretched portion 40 are placed. The second small piece plate 61 is fixed to the first small piece plate 60 with the adhesive 50 by sandwiching both ends of the fusion extending portion 40.

With this configuration, since the optical fibers 20 and 30 are bonded and fixed so as to be wrapped by the upper and lower small piece plates 60 and 61, the bonding strength is improved and the small piece plates 60 are fixed by bonding. The area can be made uniform, and variations in quality can be reduced.

The substrate 10 is made of a quartz plate having a thermal expansion coefficient substantially equal to that of the optical fibers 20 and 30. Therefore, the fusion stretched portion 40 is stable even when the temperature of the operating environment is changed. The characteristics are obtained.

[0009]

[Effect of the device]

 As described above, the present invention provides a fusion fiber coupler in which cores of a plurality of optical fibers are brought close to each other and heat-fused to form a fusion extension part, and both ends of the fusion extension part fixed on a substrate. The first small piece plate on which each of the above is placed, and the second small piece plate that fixes both ends of the fusion-stretched stretched portion between the first small piece plate and the first small piece plate with the adhesive agent. It is possible to eliminate the problem that manufacturing quality becomes unstable due to variation in fixed strength depending on the amount of. Further, since the optical fiber is wrapped by the two small piece plates 2 and fixed by adhesion, there is an effect that the adhesive strength is improved.

[Brief description of drawings]

FIG. 1 is a plan view (a) and a side view (b) of an embodiment of the present invention.

FIG. 2 is a plan view (a) and a side view (b) showing an example of a conventional fused fiber coupler mounting structure.

[Explanation of symbols]

 10,11 Substrate 20,21,30,31 Optical fiber 40,41 Fusion extension part 50,51,51 Adhesive 60,61 Small plate

Claims (1)

[Scope of utility model registration request] 1. A fusion fiber coupler in which cores of a plurality of optical fibers are brought close to each other and heat fused to form a fusion stretched portion, and both ends of the fusion stretched portion fixed on a substrate are mounted respectively. And a second small piece plate for fixing the first and second small piece plates with an adhesive to sandwich and fix both ends of the fusion-spreading portion. Implementation structure.