JPH01182810A - Optical fiber coupler housing member and optical fiber coupler housing body and its production - Google Patents
Optical fiber coupler housing member and optical fiber coupler housing body and its productionInfo
- Publication number
- JPH01182810A JPH01182810A JP489588A JP489588A JPH01182810A JP H01182810 A JPH01182810 A JP H01182810A JP 489588 A JP489588 A JP 489588A JP 489588 A JP489588 A JP 489588A JP H01182810 A JPH01182810 A JP H01182810A
- Authority
- JP
- Japan
- Prior art keywords
- optical fiber
- fiber coupler
- substrate
- housing
- fixing
- 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
- 239000013307 optical fiber Substances 0.000 title claims abstract description 66
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 10
- 239000000758 substrate Substances 0.000 claims abstract description 38
- 239000000463 material Substances 0.000 claims abstract description 15
- 239000004033 plastic Substances 0.000 claims abstract description 8
- 229920003023 plastic Polymers 0.000 claims abstract description 8
- 238000003860 storage Methods 0.000 claims description 14
- 238000000034 method Methods 0.000 claims description 6
- 229920000106 Liquid crystal polymer Polymers 0.000 claims description 5
- 239000004977 Liquid-crystal polymers (LCPs) Substances 0.000 claims description 5
- 239000003822 epoxy resin Substances 0.000 claims description 4
- 229920000647 polyepoxide Polymers 0.000 claims description 4
- 238000003466 welding Methods 0.000 claims description 3
- 239000003365 glass fiber Substances 0.000 claims description 2
- 239000002991 molded plastic Substances 0.000 claims description 2
- 238000000465 moulding Methods 0.000 abstract 1
- 239000000853 adhesive Substances 0.000 description 8
- 230000001070 adhesive effect Effects 0.000 description 8
- 239000000835 fiber Substances 0.000 description 8
- 238000010586 diagram Methods 0.000 description 5
- 238000012545 processing Methods 0.000 description 5
- 238000012360 testing method Methods 0.000 description 4
- 239000011521 glass Substances 0.000 description 3
- FJKROLUGYXJWQN-UHFFFAOYSA-N 4-hydroxybenzoic acid Chemical compound OC(=O)C1=CC=C(O)C=C1 FJKROLUGYXJWQN-UHFFFAOYSA-N 0.000 description 2
- 238000003848 UV Light-Curing Methods 0.000 description 2
- 238000007796 conventional method Methods 0.000 description 2
- 238000001035 drying Methods 0.000 description 2
- 229920001187 thermosetting polymer Polymers 0.000 description 2
- 229940090248 4-hydroxybenzoic acid Drugs 0.000 description 1
- 239000004925 Acrylic resin Substances 0.000 description 1
- 229920000178 Acrylic resin Polymers 0.000 description 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
- NIXOWILDQLNWCW-UHFFFAOYSA-N acrylic acid group Chemical group C(C=C)(=O)O NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 description 1
- 238000005253 cladding Methods 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000004927 fusion Effects 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
- 238000010438 heat treatment Methods 0.000 description 1
- 238000001746 injection moulding Methods 0.000 description 1
- 238000005498 polishing Methods 0.000 description 1
- 229920000728 polyester Polymers 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
- 229920005992 thermoplastic resin Polymers 0.000 description 1
- 238000001721 transfer moulding Methods 0.000 description 1
Landscapes
- Optical Couplings Of Light Guides (AREA)
Abstract
Description
【発明の詳細な説明】
［産業上の利用分野］
本発明は、光ファイバカップラを収納するための収納部
材およびその収納部材を用いた光ファイバカップラ収納
体とその製造方法に関するものである。DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a storage member for storing an optical fiber coupler, an optical fiber coupler storage body using the storage member, and a manufacturing method thereof.
［従来の技術］
光ファイバカップラの構造の代表例を第２図に示す、こ
れは、平行に密着させた２本の裸ファイバ１＾、ＩＢを
加熱しながら融着延伸することによって作製される。延
伸されて細くなった部分４では２本の光ファイバのコア
２＾、２Ｂがお互いに接近しているため、一方の光ファ
イバに光を通すと他方の光ファイバに光が漏れる。３Ａ
、３Ｂはクラッドである。第２図の光ファイバカップラ
のＡ端から光を入射し、Ｂ１１１とＤ端から出射する光
の強度ＩＢ＋１０を測定した結果の一例を第３図に示す
、Ｂ端とＤ端の出射光強度は光の波長によって変化し、
第３図の例では、波長１．３μｍの光はｐ端とＤ端から
５０％ずつ出射する。したがって、第３図のような特性
を示す光ファイバカップラは波長１．３μｍ帯の３ｄＢ
分岐器として用いることができる。他の波長帯の３ｄＢ
分岐器も融着延伸部の延伸長を変えることによって実現
することができる。[Prior Art] A typical example of the structure of an optical fiber coupler is shown in FIG. 2, which is fabricated by fusion-stretching two bare fibers 1^ and IB that are brought into close contact with each other in parallel while heating. . Since the cores 2^ and 2B of the two optical fibers are close to each other in the stretched and thinned portion 4, when light passes through one optical fiber, the light leaks into the other optical fiber. 3A
, 3B is a cladding. An example of the results of measuring the intensity IB+10 of the light entering the optical fiber coupler from the A end of the optical fiber coupler shown in Fig. 2 and emitting from the B end and D end is shown in Fig. 3. varies depending on the wavelength of light,
In the example shown in FIG. 3, 50% of the light with a wavelength of 1.3 μm is emitted from the P end and the D end. Therefore, an optical fiber coupler that exhibits the characteristics shown in Figure 3 has a 3 dB
Can be used as a turnout. 3dB of other wavelength bands
A branch can also be realized by changing the stretching length of the fused stretching section.
しかし、光ファイバカップラの特性が延伸長によって変
化するということは、外力による歪の影響も受は易いと
いうことであり、融着延伸部に外力が加わらないように
基板への固定法に注意する必要がある。However, the fact that the characteristics of the optical fiber coupler change depending on the length of the stretch means that it is easily affected by distortion caused by external forces, so care must be taken when fixing it to the substrate so that external force is not applied to the fused and stretched part. There is a need.
第４図は光ファイバカップラの従来の固定法の一例であ
る。裸ファイバ部分１を接着剤７を用いて基板６に固定
するとともに基□板６をハウジング８に収納し、基板６
および光ファイバカップラの被覆ファイバ部分５Ａ、５
Ｂをそれぞれ接着剤７Ａ、７Ｂ。FIG. 4 is an example of a conventional fixing method for an optical fiber coupler. The bare fiber portion 1 is fixed to the substrate 6 using an adhesive 7, and the substrate 6 is housed in the housing 8.
and coated fiber portions 5A, 5 of the optical fiber coupler.
B is adhesive 7A and 7B, respectively.
７Ｃによってハウジングに＋ｉ着固定している。このと
き基板をハウジングに１点で固定することによって、外
力によるハウジングの変形が基板、すなわち融着延伸部
に及ばないようにしている。また、光ファイバカップラ
の被覆除去端５Ｃ，５Ｄで裸ファイバを被覆を接着剤７
Ｄ、７Ｅで固定し、裸ファイバと被覆のすべりを防ぐこ
とによって、ハウジング８の外側の被覆ファイバ５＾、
５Ｂ部分に外力が加わっても融着延伸部まで及ばないよ
うにしている。基板とハウジングの材料には、光ファイ
バと線膨張係数がほぼ等しい石英ガラス（線膨張係数７
Ｘ １０−’） 、耐熱ガラス（線膨張係数３ Ｘ
１０−’）等が使用されている。接着剤には、速乾性の
熱硬化型エポキシ樹脂、紫外線硬化型変性アクリル樹脂
等が使われている。このようにして作製された３ｄＢ分
岐光ファイバカップラは、温度衝撃試験（米軍−規格Ｍ
ＩＬ−５ＴＤ−８１００試験番号５０３．２）、振動試
験（同試験番号５１４．３）等において分岐比の変動が
１％以下であり、実用上十分な信頼性を有している。It is fixed to the housing by 7C. At this time, by fixing the substrate to the housing at one point, deformation of the housing due to external force is prevented from reaching the substrate, that is, the fused and stretched portion. Also, coat the bare fiber with the adhesive 7 at the coated removed ends 5C and 5D of the optical fiber coupler.
The coated fiber 5^ on the outside of the housing 8 is fixed by fixing with D and 7E to prevent the bare fiber and the coat from slipping.
Even if an external force is applied to the 5B portion, it is prevented from reaching the fused and stretched portion. The substrate and housing are made of quartz glass, which has a coefficient of linear expansion approximately equal to that of the optical fiber (coefficient of linear expansion 7).
X 10-'), heat-resistant glass (linear expansion coefficient 3
10-') etc. are used. The adhesives used include quick-drying thermosetting epoxy resins and UV-curing modified acrylic resins. The 3 dB branch optical fiber coupler produced in this way was subjected to a temperature shock test (U.S. military - standard M).
In IL-5TD-8100 test number 503.2), vibration test (same test number 514.3), etc., the variation in branching ratio was 1% or less, and it had sufficient reliability for practical use.
［発明が解決しようとする課題］
しかしながら光ファイバカップラの低価格化の面から、
基板とハウジングの製造原価の低域、光ファイバカップ
ラ固定工程の簡略化が求められている。特に、ガラス製
基板は、材料費は安いが、−枚ずつ切断・表面研磨する
ことによる加工費が高いという問題があフた。[Problem to be solved by the invention] However, from the viewpoint of reducing the cost of optical fiber couplers,
There is a need for lower manufacturing costs for substrates and housings, and for a simpler process for fixing optical fiber couplers. In particular, although the material cost of glass substrates is low, the problem of high processing costs due to cutting and surface polishing one by one has been solved.
本発明の目的は、光ファイバカップラの信頼性を損なう
ことなく、製造原価が安い光ファイバカップラ収納部材
および光ファイバカップラ収納体を提供することにある
。An object of the present invention is to provide an optical fiber coupler housing member and an optical fiber coupler housing that are inexpensive to manufacture without impairing the reliability of the optical fiber coupler.
［課題を解決するための手段］
このような目的を達成するために、本発明の光ファイバ
収納部材は光ファイバカップラを固定するための基□板
と、基板を収容する筺体の一部とが一体成形されたプラ
スチック材料からなることを特徴とする。[Means for Solving the Problems] In order to achieve such an object, the optical fiber storage member of the present invention includes a substrate for fixing an optical fiber coupler and a part of a casing for accommodating the substrate. It is characterized by being made of integrally molded plastic material.
本発明光ファイバ収納体は基板と基板を収容する筺体の
一部とが一体成形されたプラスチック材料から□なる光
ファイバカップラ収納部材の、基板上に光ファイバカッ
プラが固定されていることを特徴とする。The optical fiber storage body of the present invention is characterized in that the optical fiber coupler is fixed on the substrate of an optical fiber coupler storage member made of a plastic material in which the substrate and a part of the casing for accommodating the substrate are integrally molded. do.
本発明光ファイバ収納体の製造方法は筺体の一部と一体
□成形された基板上に光ファイバカップラを接着固定し
、筺体の一部の上に蓋体をかぶせて密閉することを特徴
とする特
［作 用］
本発明は、光ファイバカップラの基板とハウジングの材
料に、線膨張係数が光ファイバとほぼ等しく、しかも複
雑な形状の成形が容易な特殊プラスチックスを採用し、
従来、別々であった基板とハウジングを一体成形した構
造体に光ファイバカップラを固定する。The method for manufacturing an optical fiber storage body of the present invention is characterized by adhesively fixing an optical fiber coupler onto a substrate formed integrally with a part of the housing, and then covering the part of the housing with a lid to seal it. Features [Function] The present invention uses special plastics, which have almost the same coefficient of linear expansion as the optical fiber and can be easily molded into complex shapes, as the material for the substrate and housing of the optical fiber coupler.
An optical fiber coupler is fixed to a structure in which a substrate and a housing, which were conventionally separate, are integrally molded.
本発明によれば光ファイバカップラ固定作業に要する時
間が短縮され、また、光ファイバカップラを固定する基
板およびハウジングの加工費が安くなるため、光ファイ
バカップラの製造原価を大幅に低減できる。According to the present invention, the time required for fixing the optical fiber coupler is shortened, and the processing cost of the substrate and housing for fixing the optical fiber coupler is reduced, so that the manufacturing cost of the optical fiber coupler can be significantly reduced.
［実施例］ 以下に図面を参照して本発明を説明する。[Example] The present invention will be explained below with reference to the drawings.
第１図は本発明の第１の実施例を説明する図であって、
同図（ａ）は正面図、（ｂ）は側面図である。基板ｌＯ
とハウジング基体９とが図示の１１において一点でつな
がっている。材料には、プラスチックスの中で最も線膨
張係数が小さい液晶高分子（線膨張係数３ Ｘ １０−
’）を用い、特に基板部分には、ガラス長繊維を光ファ
イバカップラの長平方向に平行に充填している。これに
光ファイバカップラを紫外線硬化型接着剤を用いて固定
し、その上からハウジングカバー１２をかぶせ、超音波
溶着で固定する。本固定法で°は、従来必要であった基
板とハウジングとの固定作業が不要である。また、ハウ
ジングの材料に熱可塑性樹脂である液晶高分子を採用す
ることによって、数秒以内の短時間固定が可能な超音波
融着の手段を用いることができる。その結果、光ファイ
バカップラ固定作業に要する時間は大幅に短縮される。FIG. 1 is a diagram illustrating a first embodiment of the present invention,
3(a) is a front view, and FIG. 2(b) is a side view. Substrate lO
and the housing base 9 are connected at one point at 11 shown in the figure. The material is a liquid crystal polymer with the lowest coefficient of linear expansion among plastics (coefficient of linear expansion 3 x 10-
'), and in particular, the substrate portion is filled with long glass fibers parallel to the longitudinal direction of the optical fiber coupler. An optical fiber coupler is fixed to this using an ultraviolet curable adhesive, and the housing cover 12 is placed over it and fixed by ultrasonic welding. This fixing method eliminates the need for fixing work between the board and the housing, which was required in the past. In addition, by employing a liquid crystal polymer, which is a thermoplastic resin, as the material of the housing, it is possible to use ultrasonic fusion means that can be fixed for a short period of time within several seconds. As a result, the time required for fixing the optical fiber coupler is significantly reduced.
さらに、第１図の構造体は射出成形の手段によって多数
個を同時に作ることができるため、従来のガラス製の場
合と比べて加工費は大幅に安くなる。以上、基板とハウ
ジングの材料に液晶高分子を使用した例を示したが、液
晶高分子はパラヒドロキシ安息香酸を含むポリエステル
系共重合体であり、分子構造の違いにより熱変形温度が
６４〜３５０°のものがある。ここでは、成形性と超音
波溶着性の点から、熱変形温度が１８０〜２４０℃のも
のが最も適している。Furthermore, since the structure shown in FIG. 1 can be manufactured in large numbers at the same time by means of injection molding, processing costs are significantly lower than in conventional glass structures. Above, an example was shown in which a liquid crystal polymer was used as the material for the substrate and housing. However, the liquid crystal polymer is a polyester copolymer containing parahydroxybenzoic acid, and due to the difference in molecular structure, the heat distortion temperature is 64 to 350. There are things like °. Here, from the viewpoint of moldability and ultrasonic weldability, the most suitable material has a heat deformation temperature of 180 to 240°C.
本発明の第２の実施例は、構造は第１図と同じであるが
、材料に熱硬化型樹脂であるエポキシ樹脂（線膨張係数
２ Ｘ １０−’）を用い、基板部分にガラス長繊維を
充填したものである。エポキシ樹脂には超音波溶着の手
段が使えないため、ハウジングカバーの固定には速乾性
の、熱硬化型接着剤あるいは嫌気性の紫外線硬化型接着
剤を用いる必要がある。本固定法の場合も基板とハウジ
ングとの固定作業が不要であるため、光ファイバカップ
ラ固定作業に要する時間は従来よりかなり短縮される。The second embodiment of the present invention has the same structure as that shown in FIG. It is filled with Since ultrasonic welding cannot be used with epoxy resin, it is necessary to use a quick-drying, thermosetting adhesive or an anaerobic UV-curing adhesive to fix the housing cover. This fixing method also does not require fixing work between the board and the housing, so the time required for fixing the optical fiber coupler is considerably reduced compared to the conventional method.
また、トランスファー成形の手段によってエポキシ樹脂
を用いて第１図の構造体を多数個同時に作ることができ
るため、基板とハウジングの加工費は従来より大幅に安
くなる。Further, since a large number of the structures shown in FIG. 1 can be made simultaneously using epoxy resin by means of transfer molding, processing costs for the substrate and housing can be significantly lower than in the past.
第１図の実施例ではハウジングの形状が矩形の場合につ
いて示したが、半円形等、他の形状の場合にも本発明が
適用できることは言うまでもない。In the embodiment shown in FIG. 1, the housing has a rectangular shape, but it goes without saying that the present invention is also applicable to other shapes such as a semicircular shape.
［発明の効果］
以上説明したように、本発明によれば光ファイバカップ
ラ固定作業に要する時間が短縮され、また、光ファイバ
カップラを固定する基板およびハウジングの加工費が安
くなるため、光ファイバカップラの製造原価を大幅に低
減できる利点がある。[Effects of the Invention] As explained above, according to the present invention, the time required for fixing the optical fiber coupler is shortened, and the processing cost of the substrate and housing for fixing the optical fiber coupler is reduced, so that the optical fiber coupler can be fixed easily. This has the advantage of significantly reducing manufacturing costs.
第１図は本発明の光ファイバカップラ収納部材の実施例
を示す図、
第２図は光ファイバカップラの構造の一例を示す図、
第３図は第２図の光ファイバカップラの分岐比の波長特
性の一例を示す特性図、
第４図は従来の光ファイバカップラの固定法を示す図で
ある。
１ 、 ＩＡ、１Ｂ・・・裸ファイバ、２Ａ、２Ｂ・・
・コア、
３Ａ、３Ｂ・・・クラッド、
４・・・融着延伸部、
５Ａ、５Ｂ 、−・・被覆ファイバ、
６・・・基板、
フ、 ７Ａ、７Ｂ、７Ｃ，７０，７Ｅ−・・接着剤、８
・・・ハウジング、
９・・・ハウジング基体、
１０−・・基板、
１１・・・連結部、
１２・・・ハウジングカバー。
特許出願人 日本電信電話株式会社Fig. 1 is a diagram showing an example of the optical fiber coupler storage member of the present invention, Fig. 2 is a diagram showing an example of the structure of the optical fiber coupler, and Fig. 3 is the wavelength of the branching ratio of the optical fiber coupler in Fig. 2. A characteristic diagram showing an example of the characteristics. FIG. 4 is a diagram showing a conventional method of fixing an optical fiber coupler. 1, IA, 1B...bare fiber, 2A, 2B...
・Core, 3A, 3B...Clad, 4...Fused and drawn portion, 5A, 5B, ---Coated fiber, 6...Substrate, Fu, 7A, 7B, 7C, 70, 7E-- adhesive, 8
...Housing, 9...Housing base body, 10-...Substrate, 11...Connecting portion, 12...Housing cover. Patent applicant Nippon Telegraph and Telephone Corporation
Claims (1)
板を収容する筺体の一部とが一体成形されたプラスチッ
ク材料からなることを特徴とする光ファイバカップラ収
納部材。 ２）前記基板と前記筺体の一部とが一点でつながってい
ることを特徴とする請求項１記載の光ファイバカップラ
収納部材。 ３）前記プラスチック材料が液晶高分子材料およびエポ
キシ樹脂のいずれかであることを特徴とする請求項１記
載の光ファイバ収納部材。 ４）前記基板が前記基板に固定される光ファイバカップ
ラの長手方向に平行にガラス長繊維を充填したプラスチ
ック材料からなることを特徴とする請求項１記載の光フ
ァイバカップラ収納部材。 ５）基板と該基板を収容する筺体の一部とが一体成形さ
れたプラスチック材料からなる光ファイバカップラ収納
部材の、前記基板上に光ファイバカップラが固定されて
いることを特徴とする光ファイバカップラ収納体。 ６）筺体の一部と一体成形された基板上に光ファイバカ
ップラを接着固定し、前記筺体の一部の上に蓋体をかぶ
せて密閉することを特徴とする光ファイバカップラ収納
体の製造方法。 ７）前記筺体の一部と前記蓋体とを超音波溶着すること
を特徴とする請求項６記載の光ファイバカップラ収納体
の製造方法。[Scope of Claims] 1) An optical fiber coupler storage member characterized in that a substrate for fixing the optical fiber coupler and a part of a casing for accommodating the substrate are made of integrally molded plastic material. 2) The optical fiber coupler storage member according to claim 1, wherein the substrate and a part of the housing are connected at one point. 3) The optical fiber housing member according to claim 1, wherein the plastic material is either a liquid crystal polymer material or an epoxy resin. 4) The optical fiber coupler storage member according to claim 1, wherein the substrate is made of a plastic material filled with long glass fibers in parallel to the longitudinal direction of the optical fiber coupler fixed to the substrate. 5) An optical fiber coupler, characterized in that the optical fiber coupler is fixed on the substrate of an optical fiber coupler storage member made of a plastic material in which the substrate and a part of the casing housing the substrate are integrally molded. storage body. 6) A method for manufacturing an optical fiber coupler storage body, which comprises adhesively fixing an optical fiber coupler onto a substrate integrally molded with a part of the housing, and covering the part of the housing with a lid to seal it. . 7) The method of manufacturing an optical fiber coupler housing according to claim 6, further comprising ultrasonically welding a part of the housing and the lid.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63004895A JPH0786577B2 (en) | 1988-01-14 | 1988-01-14 | Optical fiber coupler housing member, optical fiber coupler housing body and manufacturing method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63004895A JPH0786577B2 (en) | 1988-01-14 | 1988-01-14 | Optical fiber coupler housing member, optical fiber coupler housing body and manufacturing method thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH01182810A true JPH01182810A (en) | 1989-07-20 |
| JPH0786577B2 JPH0786577B2 (en) | 1995-09-20 |
Family
ID=11596405
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP63004895A Expired - Lifetime JPH0786577B2 (en) | 1988-01-14 | 1988-01-14 | Optical fiber coupler housing member, optical fiber coupler housing body and manufacturing method thereof |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0786577B2 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH03267903A (en) * | 1990-03-19 | 1991-11-28 | Sumitomo Electric Ind Ltd | Method for reinforcing fiber type coupler |
| US5426714A (en) * | 1992-01-27 | 1995-06-20 | Corning Incorporated | Optical fiber couplers packaged for resistance to bending or breakage, and methods of making the same |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS62169311U (en) * | 1986-04-15 | 1987-10-27 | ||
| JPS63167308A (en) * | 1986-12-29 | 1988-07-11 | Matsushita Electric Ind Co Ltd | Production of optical branching/coupling device |
-
1988
- 1988-01-14 JP JP63004895A patent/JPH0786577B2/en not_active Expired - Lifetime
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS62169311U (en) * | 1986-04-15 | 1987-10-27 | ||
| JPS63167308A (en) * | 1986-12-29 | 1988-07-11 | Matsushita Electric Ind Co Ltd | Production of optical branching/coupling device |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH03267903A (en) * | 1990-03-19 | 1991-11-28 | Sumitomo Electric Ind Ltd | Method for reinforcing fiber type coupler |
| US5426714A (en) * | 1992-01-27 | 1995-06-20 | Corning Incorporated | Optical fiber couplers packaged for resistance to bending or breakage, and methods of making the same |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0786577B2 (en) | 1995-09-20 |
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