JPH02240609A - Optical branching/coupling device - Google Patents
Optical branching/coupling deviceInfo
- Publication number
- JPH02240609A JPH02240609A JP6239789A JP6239789A JPH02240609A JP H02240609 A JPH02240609 A JP H02240609A JP 6239789 A JP6239789 A JP 6239789A JP 6239789 A JP6239789 A JP 6239789A JP H02240609 A JPH02240609 A JP H02240609A
- Authority
- JP
- Japan
- Prior art keywords
- resin
- optical
- optical branching
- branching
- coupling part
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 230000003287 optical effect Effects 0.000 title claims abstract description 36
- 230000008878 coupling Effects 0.000 title claims abstract description 17
- 238000010168 coupling process Methods 0.000 title claims abstract description 17
- 238000005859 coupling reaction Methods 0.000 title claims abstract description 17
- 239000011347 resin Substances 0.000 claims abstract description 27
- 229920005989 resin Polymers 0.000 claims abstract description 27
- 239000013307 optical fiber Substances 0.000 claims abstract description 23
- 238000000576 coating method Methods 0.000 claims abstract description 6
- 239000011248 coating agent Substances 0.000 claims description 4
- 239000003365 glass fiber Substances 0.000 description 6
- 238000000034 method Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 238000005253 cladding Methods 0.000 description 2
- 230000008602 contraction Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000003822 epoxy resin Substances 0.000 description 2
- UHESRSKEBRADOO-UHFFFAOYSA-N ethyl carbamate;prop-2-enoic acid Chemical compound OC(=O)C=C.CCOC(N)=O UHESRSKEBRADOO-UHFFFAOYSA-N 0.000 description 2
- 229920000647 polyepoxide Polymers 0.000 description 2
- 239000004925 Acrylic resin Substances 0.000 description 1
- 238000005530 etching Methods 0.000 description 1
- LNEPOXFFQSENCJ-UHFFFAOYSA-N haloperidol Chemical compound C1CC(O)(C=2C=CC(Cl)=CC=2)CCN1CCCC(=O)C1=CC=C(F)C=C1 LNEPOXFFQSENCJ-UHFFFAOYSA-N 0.000 description 1
- 239000000155 melt Substances 0.000 description 1
- 238000005498 polishing Methods 0.000 description 1
- 230000001902 propagating effect Effects 0.000 description 1
- 239000010453 quartz Substances 0.000 description 1
- 230000002787 reinforcement Effects 0.000 description 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/24—Coupling light guides
- G02B6/26—Optical coupling means
- G02B6/28—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals
- G02B6/2804—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals forming multipart couplers without wavelength selective elements, e.g. "T" couplers, star couplers
- G02B6/2821—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals forming multipart couplers without wavelength selective elements, e.g. "T" couplers, star couplers using lateral coupling between contiguous fibres to split or combine optical signals
- G02B6/2835—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals forming multipart couplers without wavelength selective elements, e.g. "T" couplers, star couplers using lateral coupling between contiguous fibres to split or combine optical signals formed or shaped by thermal treatment, e.g. couplers
Abstract
Description
【発明の詳細な説明】 〔産業上の利用分野〕 本発明は光ファイバ利用型の光分岐結合器に関する。[Detailed description of the invention] [Industrial application field] The present invention relates to an optical branching coupler using optical fibers.
光ファイバを利用した光分岐結合器は、研磨法、エツチ
ング法あるいは溶融着法等を用いてガラスファイバ同士
を固着することで作製される。ここで、光がカップリン
グする部分（光分岐結合部）では光ファイバ素線の被覆
が除去され、クラッドおよびコアからなるガラスファイ
バが露出しているが、この部分は通常のガラスファイバ
の外径（クラツド径）よりも細くなっている。このため
、光ファイバ利用型の光分岐結合器では、収納ケース等
に固定して光結合部の補強を図ることが必要になる。Optical branching couplers using optical fibers are manufactured by bonding glass fibers together using a polishing method, an etching method, a melt bonding method, or the like. Here, the coating of the optical fiber is removed at the part where light couples (optical branching/coupling part), and the glass fiber consisting of the cladding and core is exposed, but this part has the outer diameter of a normal glass fiber. (Clad diameter). For this reason, in an optical branching/coupling device using optical fibers, it is necessary to reinforce the optical coupling portion by fixing it to a storage case or the like.
この様な補強技術の一例として、Ｅ、Ｃ，０，Ｃ。An example of such reinforcement technology is E, C, 0, C.
ｐｒｏｃｅｅｄｉｎｇ （１９８８） ５８１には、エ
ポキシ系樹脂で光ファイバ素線を収納ケースに固定する
技術が示されている。Proceedings (1988) 581 discloses a technique for fixing an optical fiber to a storage case using an epoxy resin.
しかしながら、上記のように光ファイバ素線が固定され
た光分岐結合器では、低温環境下で使用すると伝播する
光信号の分岐比が変動してしまう問題があった。このよ
うな分岐比の変動は、低温条件下における樹脂の収縮に
よって、光ファイバの結合部に「ひねり」等の応力が生
じるためであると考えられる。However, the optical branching coupler in which the optical fiber is fixed as described above has a problem in that the branching ratio of the propagating optical signal fluctuates when used in a low-temperature environment. Such fluctuations in the branching ratio are thought to be due to stress such as "twisting" occurring at the coupling portion of the optical fiber due to contraction of the resin under low temperature conditions.
〔課題を解決するための手段および作用〕本発明者は上
述の諸点に鑑み、特に低温下での樹脂の収縮による応力
発生が光の分岐比の変動を生じさせていた事情に着目し
、鋭意研究を重ねた結果、本発明を完成するに至った。[Means and effects for solving the problem] In view of the above-mentioned points, the inventors of the present invention have focused on the situation in which stress generation due to contraction of resin at low temperatures causes fluctuations in the light branching ratio, and has made efforts to solve the problem. As a result of repeated research, we have completed the present invention.
本発明に係る光分岐結合器は、被覆が施された複数の光
ファイバ素線の一部分で被覆を除去し、当該被覆除去部
分同士を互いに固着して光分岐結合部を構成し、この光
分岐結合部の光軸方向の両側で複数の光ファイバ素線を
樹脂により収納ケースに固定した光分岐結合器に適用さ
れる。The optical branching coupler according to the present invention removes the coating from a portion of a plurality of coated optical fiber strands, and adheres the coated removed portions to each other to form an optical branching coupler, and It is applied to an optical branching coupler in which a plurality of optical fibers are fixed to a storage case with resin on both sides of the coupling part in the optical axis direction.
このような光分岐結合器において、まず、硬化後の樹脂
の線膨脹係数が大きいと、低温下で樹脂に大きな収縮が
予測でき、これによって光分岐結合部に「ひねり」等の
応力を生じさせると考えられる。そこで、硬化後の線膨
脹係数に関し、６種類の異なる樹脂を用いて光分岐結合
器を試作ｌまたところ、硬化後の線膨脹係数が一り０℃
〜＋２５℃において１ｘｌＯｄｅｇ−’未満であるとき
には、分岐比が十分に小さい変動となることがわかった
。In such an optical branching coupler, firstly, if the linear expansion coefficient of the resin after curing is large, it can be expected that the resin will shrink significantly at low temperatures, which will cause stress such as "twisting" in the optical branching coupler. it is conceivable that. Therefore, regarding the coefficient of linear expansion after curing, we fabricated a prototype optical branching coupler using six different types of resin.
It has been found that when it is less than 1xlOdeg-' at ~+25°C, the branching ratio has a sufficiently small variation.
次に、硬化後の樹脂のヤング率が大きいと、樹脂に収縮
が生じたときに大きな応力が生じると予測できる。そこ
で、硬化後の樹脂のヤング率に関し、特にその温度依存
性にも着目して、６種類の異なる樹脂を用いて光分岐結
合器を試作したところ、硬化後の常温におけるヤング率
が０．２ｋｇ／！！■２以下であり、かつ−４０℃にお
けるヤング率が１ ｋｇ ／ ａｍ ２以下のときに、
分岐比の変動を十分に抑えられることがわかった。Next, if the Young's modulus of the resin after curing is large, it can be predicted that a large stress will be generated when the resin contracts. Therefore, with regard to the Young's modulus of the resin after curing, we focused especially on its temperature dependence, and when we prototyped an optical splitter coupler using six different types of resin, we found that the Young's modulus at room temperature after curing was 0.2 kg. /! ! ■2 or less, and when the Young's modulus at -40°C is 1 kg/am2 or less,
It was found that fluctuations in the branching ratio could be sufficiently suppressed.
具体的な実施例（実験例）の説明に先立ち、光分岐結合
器の一例の構成を第１図により説明する。Prior to describing a specific example (experimental example), the configuration of an example of an optical branching coupler will be described with reference to FIG.
第１図はその平面構成図である。コアおよびクラッドか
らなるガラスファイバ１は被覆が施されて光ファイバ素
線１１〜１４をなし、これらのガラスファイバ１は互い
に固着されて光分岐結合部２０を構成している。収納ケ
ース３は例えば石英で構成され、この収納ケース３の長
手方向の溝に沿って光ファイバ素線１１〜１４が配設さ
れる。FIG. 1 is a plan configuration diagram thereof. A glass fiber 1 consisting of a core and a cladding is coated to form optical fiber strands 11 to 14, and these glass fibers 1 are fixed to each other to constitute an optical branching/coupling section 20. The storage case 3 is made of quartz, for example, and the optical fibers 11 to 14 are arranged along the longitudinal grooves of the storage case 3.
そして、光ファイバ素線１１〜１４は光分岐結合部２０
の両側において、樹脂４により収納ケース３に固定され
る。この固定は、まず収納ケース３に光ファイバ素線１
１〜１４をセットし、硬化前の樹脂４を流し込んで熱も
しくは紫外線で硬化させることにより行う。The optical fiber wires 11 to 14 are connected to an optical branching/coupling section 20.
It is fixed to the storage case 3 with resin 4 on both sides. To fix this, first place the optical fiber wire into the storage case 3.
1 to 14 are set, and the uncured resin 4 is poured in and cured with heat or ultraviolet rays.
次に、本発明者による具体的な実施例を説明する。Next, a specific example by the present inventor will be described.
第１の実施例（実験例）
紫外線硬化型のウレタンアクリレート系樹脂を用いて、
３個の光分岐結合器（試料）Ａ−Ｃを作製した。ここで
、試料Ａ−Ｃに用いた樹脂４の線膨脹係数は第２図の通
りであり、ヤング率の温度依存性は第３図の通りである
。First example (experimental example) Using ultraviolet curable urethane acrylate resin,
Three optical branching couplers (sample) A to C were produced. Here, the linear expansion coefficient of the resin 4 used in samples A to C is as shown in FIG. 2, and the temperature dependence of Young's modulus is as shown in FIG.
これら光分岐結合器Ａ−Ｃについて、第１図のポートＩ
から光を入射し、２５℃（室温）と−４０℃におけるポ
ートｍ、ｒｖの出力差をｎ１定したところ、第２図の結
果を得た。このときの過剰損失は、２５℃、−４０℃共
に０．１ｄＢであり、温度依存性はなかった。Regarding these optical branching couplers A-C, port I in FIG.
When light was inputted from the inlet and the output difference between ports m and rv at 25° C. (room temperature) and −40° C. was determined as n1, the results shown in FIG. 2 were obtained. The excess loss at this time was 0.1 dB at both 25°C and -40°C, and there was no temperature dependence.
この結果から、ヤング率を低くすること（特に低温条件
下でのヤング率を低くすること）により、分岐比の変動
を改善できることがわかった。特に、常温におけるヤン
グ率が０ 、 ２ ）ｃｇ ／ ｎｕｓ ２以下であっ
て、−４０℃におけるヤング率が１ ｋｇ ／ ａｒｍ
２以下となった試料Ａについては、分岐比の変動をほ
とんどゼロにできることがわかった。From this result, it was found that by lowering the Young's modulus (especially lowering the Young's modulus under low-temperature conditions), fluctuations in the branching ratio can be improved. In particular, the Young's modulus at room temperature is 0.2) cg/nus 2 or less, and the Young's modulus at -40°C is 1 kg/arm.
It was found that for sample A, which had a value of 2 or less, variation in the branching ratio could be reduced to almost zero.
第２の実施例（実験例）
紫外線硬化型のウレタンアクリート系およびエポキシ系
の樹脂を用い、３個の光分岐結合器（試料）Ｄ−Ｆを作
製した。なお、樹脂の条件は第４図、第５図の通りであ
る。これについて、上記と同様に分岐比をｎノ定したと
ころ、第４図の結果を得た。Second Example (Experimental Example) Three optical branching couplers (sample) D-F were manufactured using ultraviolet curing urethane acrylate and epoxy resins. Note that the resin conditions are as shown in FIGS. 4 and 5. Regarding this, when the branching ratio was determined as n in the same manner as above, the results shown in FIG. 4 were obtained.
この結果から、樹脂の線膨脹係数を１．Ｘ１０−４／℃
以下とすれば、ヤング率がある程度大きくても安定した
分岐比となることがわかる。From this result, the linear expansion coefficient of the resin was determined to be 1. X10-4/℃
It can be seen that if the ratio is set below, a stable branching ratio can be obtained even if the Young's modulus is large to some extent.
以上、詳細に説明した通り本発明によれば、光ファイバ
素線の固定に用いる樹脂として、線膨脹係数またはヤン
グ率が所定値以下のものを選択することにより、光分岐
結合部に応力が加わらないようにすることができる。こ
のため、低温環境下で使用されても、常温化での分岐比
と異なることのない特性を実現できる効果がある。As described in detail above, according to the present invention, stress is not applied to the optical branching/coupling portion by selecting a resin whose coefficient of linear expansion or Young's modulus is equal to or less than a predetermined value as the resin used for fixing the optical fiber wire. You can avoid it. Therefore, even when used in a low-temperature environment, it is possible to achieve characteristics that do not differ from the branching ratio at room temperature.
第１図は本発明の実施例に係る光分岐結合器の平面図、
第２図および第３図は第１の実施例の説明図、第４図お
よび第５図は第２の実施例の説明図である。
ｌ・・・ガラスファイバ、１１〜１４・・・光ファイバ
索線、２０・・・光分岐結合部、３・・・収納ケース、
４・・・樹脂。
特許出願人 住友電気工業株式会社
代理人弁理士 長谷用 芳 樹脂】の実験例
第２図
第
図
温度
第１の実験例
第３図FIG. 1 is a plan view of an optical branching coupler according to an embodiment of the present invention;
FIGS. 2 and 3 are explanatory diagrams of the first embodiment, and FIGS. 4 and 5 are explanatory diagrams of the second embodiment. l...Glass fiber, 11-14...Optical fiber cable line, 20...Optical branching and coupling part, 3...Storage case,
4...Resin. Experimental example of Patent applicant Sumitomo Electric Industries Co., Ltd. Patent attorney Yoshitoshi Hase Figure 2 Figure 1 Experimental example of Temperature 1 Figure 3
Claims (1)
記被覆を除去し、当該被覆除去部分同士を互いに固着し
て光分岐結合部を構成し、この光分岐結合部の光軸方向
の両側で前記複数の光ファイバ素線を樹脂により収納ケ
ースに固定した光分岐結合器において、 前記樹脂の硬化後の線膨脹係数が１×１０＾−＾４／℃
未満であることを特徴とする光分岐結合器。 ２、被覆が施された複数の光ファイバ素線の一部分で前
記被覆を除去し、当該被覆除去部分同士を互いに固着し
て光分岐結合部を構成し、この光分岐結合部の光軸方向
の両側で前記複数の光ファイバ素線を樹脂により収納ケ
ースに固定した光分岐結合器において、 前記樹脂の硬化後の常温におけるヤング率が０．２ｋｇ
／ｍｍ＾２以下であって、かつ−４０℃におけるヤング
率が１ｋｇ／ｍｍ＾２以下であることを特徴とする光分
岐結合器。[Scope of Claims] 1. The coating is removed from a portion of a plurality of coated optical fiber strands, and the coated removed portions are fixed to each other to form an optical branching/coupling section, and this optical branching/coupling In the optical branching coupler in which the plurality of optical fiber strands are fixed to a storage case with resin on both sides in the optical axis direction of the part, the coefficient of linear expansion of the resin after curing is 1 x 10^-^4/°C.
An optical branching coupler characterized in that: 2. Remove the coating from a portion of a plurality of coated optical fiber strands, adhere the coated removed portions to each other to form an optical branching and coupling section, and In an optical branching coupler in which the plurality of optical fibers are fixed to a storage case with resin on both sides, the Young's modulus of the resin at room temperature after curing is 0.2 kg.
/mm^2 or less, and a Young's modulus at -40°C of 1 kg/mm^2 or less.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1062397A JP2956059B2 (en) | 1989-03-15 | 1989-03-15 | Optical branch coupler |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1062397A JP2956059B2 (en) | 1989-03-15 | 1989-03-15 | Optical branch coupler |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH02240609A true JPH02240609A (en) | 1990-09-25 |
| JP2956059B2 JP2956059B2 (en) | 1999-10-04 |
Family
ID=13198964
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1062397A Expired - Lifetime JP2956059B2 (en) | 1989-03-15 | 1989-03-15 | Optical branch coupler |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2956059B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0538605U (en) * | 1991-10-30 | 1993-05-25 | 京セラ株式会社 | Optical fiber coupler |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6429808A (en) * | 1987-07-24 | 1989-01-31 | Japan Aviation Electron | Optical fiber coupler |
-
1989
- 1989-03-15 JP JP1062397A patent/JP2956059B2/en not_active Expired - Lifetime
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6429808A (en) * | 1987-07-24 | 1989-01-31 | Japan Aviation Electron | Optical fiber coupler |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0538605U (en) * | 1991-10-30 | 1993-05-25 | 京セラ株式会社 | Optical fiber coupler |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2956059B2 (en) | 1999-10-04 |
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