JPH0666005B2 - Fiber-type turnip manufacturing method - Google Patents
Fiber-type turnip manufacturing methodInfo
- Publication number
- JPH0666005B2 JPH0666005B2 JP63270009A JP27000988A JPH0666005B2 JP H0666005 B2 JPH0666005 B2 JP H0666005B2 JP 63270009 A JP63270009 A JP 63270009A JP 27000988 A JP27000988 A JP 27000988A JP H0666005 B2 JPH0666005 B2 JP H0666005B2
- Authority
- JP
- Japan
- Prior art keywords
- coupler
- fiber
- tension
- manufacturing
- optical
- 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.)
- Expired - Lifetime
Links
- 238000004519 manufacturing process Methods 0.000 title claims description 20
- 235000011293 Brassica napus Nutrition 0.000 title 1
- 240000008100 Brassica rapa Species 0.000 title 1
- 235000000540 Brassica rapa subsp rapa Nutrition 0.000 title 1
- 239000000835 fiber Substances 0.000 claims description 32
- 239000013307 optical fiber Substances 0.000 claims description 27
- 230000003287 optical effect Effects 0.000 claims description 14
- 230000001681 protective effect Effects 0.000 claims description 10
- 238000000576 coating method Methods 0.000 claims description 6
- 230000007246 mechanism Effects 0.000 claims description 5
- 239000000853 adhesive Substances 0.000 claims description 3
- 230000001070 adhesive effect Effects 0.000 claims description 3
- 239000011248 coating agent Substances 0.000 claims description 3
- 238000000034 method Methods 0.000 description 16
- 230000008569 process Effects 0.000 description 5
- 238000002474 experimental method Methods 0.000 description 4
- 230000004927 fusion Effects 0.000 description 3
- 230000007774 longterm Effects 0.000 description 3
- 230000008901 benefit Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000003286 fusion draw glass process Methods 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 230000002542 deteriorative effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000003822 epoxy resin Substances 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 238000005498 polishing Methods 0.000 description 1
- 229920000647 polyepoxide Polymers 0.000 description 1
- 230000000644 propagated effect Effects 0.000 description 1
- 230000001902 propagating effect Effects 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
Landscapes
- Mechanical Coupling Of Light Guides (AREA)
Description
【発明の詳細な説明】 〔産業上の利用分野〕 この発明は、光ファイバ内の伝播光を分岐あるいは合流
させるファイバ形カプラの製造方法に関し、特に、複数
の光ファイバを融着、延伸する工程を備えた製造方法に
関するものである。Description: TECHNICAL FIELD The present invention relates to a method for manufacturing a fiber-type coupler for branching or merging propagating light in an optical fiber, and particularly to a step of fusing and extending a plurality of optical fibers. The present invention relates to a manufacturing method including.
ファイバ形カプラは、単一波長の光を分岐／結合あるい
は複数波長の光を分波／合波する機能を有し、この製造
方法として、ファイバ同士を融着させて延伸する融着延
伸法と、側面を研磨した２本のファイバを対向させて構
成する研磨法がある。The fiber type coupler has a function of branching / coupling light of a single wavelength or demultiplexing / combining light of a plurality of wavelengths. As a manufacturing method thereof, there is a fusion drawing method of fusing and drawing fibers. There is a polishing method in which two fibers whose side surfaces are polished are opposed to each other.
第６図は、従来技術に係るファイバ形カプラ製造方法
（融着延伸法）を示すフローチャートである（“STABLE
LOW-LOSS SINGLE-MODE COUPLERS",ELECTRONICS LETTER
S 15th March 1984 Vol.20 No.6 P.230-232）。以下、
例えば単一モードファイバを使用するファイバ形カプラ
について説明する。FIG. 6 is a flowchart showing a fiber coupler manufacturing method (fusion fusion drawing method) according to the prior art (“STABLE”).
LOW-LOSS SINGLE-MODE COUPLERS ", ELECTRONICS LETTER
S 15th March 1984 Vol.20 No.6 P.230-232). Less than,
For example, a fiber coupler using a single mode fiber will be described.
まず、２本の光ファイバの被覆を一部除去し、光ファイ
バを互いに密着させる（ステップ101）。次に、バーナ
等で加熱することにより、この部分を平行に融着させ、
その後、当該光軸方向へ延伸させる（ステップ102）。
この場合、光ファイバの一端から入射された光を他端で
測定することにより、光分岐比を検知する（ステップ10
3）。所定の分岐比が得られたところで、光ファイバの
延伸を停止させ、カプラ部材を形成する（ステップ10
4）。次に、このカプラ部材を保護部材に固定、接着さ
せ、ファイバ形カプラを形成する（ステップ105）。First, the coatings of the two optical fibers are partially removed, and the optical fibers are brought into close contact with each other (step 101). Next, by heating with a burner etc., this part is fused in parallel,
Then, it is stretched in the optical axis direction (step 102).
In this case, the light splitting ratio is detected by measuring the light incident from one end of the optical fiber at the other end (step 10
3). When a predetermined branching ratio is obtained, the optical fiber is stopped from being stretched to form a coupler member (step 10).
Four). Next, this coupler member is fixed and adhered to the protective member to form a fiber type coupler (step 105).
また、他の従来技術として、融着・延伸させずに、２本
の光ファイバを捩じり合わせた状態で加熱、延伸する方
法がある（昭和59年度電子通信学会光・電波部門全国大
会、バイコニカルテーパ型光分配器製造方法の一検
討）。Further, as another conventional technique, there is a method of heating and stretching in a state in which two optical fibers are twisted together without being fused and stretched. A Study on Manufacturing Method of Biconical Tapered Optical Distributor).
従来技術に係るファイバ形カプラは、いずれも保護部材
に接着剤等で固定されるが、延伸後の細径化したカプラ
部は、外径が20μｍ足らずになり、延伸前の外径のほぼ
10分の１近くになる。All of the fiber-type couplers according to the related art are fixed to a protective member with an adhesive or the like, but the outer diameter of the coupler portion having a reduced diameter after stretching is less than 20 μm, which is almost equal to the outer diameter before stretching.
It will be close to 1/10.
その為、カプラ部における引張り強度は著しく低下し、
ヒートサイクルが加わることにより、断線する場合があ
る。Therefore, the tensile strength of the coupler is significantly reduced,
The wire may break due to the addition of heat cycle.
このように、従来技術に係るファイバ形カプラは、ヒー
トサイクルが加わる環境下で使用するには、信頼性が悪
いという欠点があった。As described above, the fiber coupler according to the related art has a drawback that it is unreliable when used in an environment to which a heat cycle is applied.
そこでこの発明は、温度が変化する環境下で断線の少な
いファイバ形カプラの製造方法を提供することにより、
ファイバ形カプラの長期的信頼性の向上を目的とするも
のである。Therefore, the present invention provides a method for manufacturing a fiber-type coupler with less disconnection in an environment where the temperature changes,
The purpose is to improve the long-term reliability of the fiber coupler.
上記課題を達成するため、この発明に係るファイバ形カ
プラの製造方法は、３つの工程を経て製造される。第１
の工程では、被覆を除去した少なくとも２本以上の光フ
ァイバを平行に保持した状態で、融着させながら当該光
軸方向へと延伸させ、所定の光分岐比を有するカプラ部
材を形成する。第２の工程では、カプラ部材に取り付け
られた張力付加測定機構を用い、カプラ部材に当該光軸
方向に沿って所定の張力を加えると共に加えられた張力
を測定する。第３の工程では、所定の張力が加えられた
状態で、このカプラ部材を保護部材に固定する。In order to achieve the above object, the method for manufacturing a fiber coupler according to the present invention is manufactured through three steps. First
In the step (1), at least two or more optical fibers with the coating removed are held in parallel and are stretched in the optical axis direction while being fused to form a coupler member having a predetermined optical branching ratio. In the second step, a tension applied measuring mechanism attached to the coupler member is used to apply a predetermined tension to the coupler member along the optical axis direction and measure the applied tension. In the third step, the coupler member is fixed to the protective member with a predetermined tension applied.
この場合、張力が4g〜14gであると効果的である。In this case, it is effective that the tension is 4 g to 14 g.
この発明は、以上のように構成されているので、保護部
材に固定された光ファイバは、温度変化により当該ファ
イバ形カプラに作用する張力より高い破断強度を備える
ことができる。Since the present invention is configured as described above, the optical fiber fixed to the protective member can have a breaking strength higher than the tension acting on the fiber type coupler due to temperature change.
この場合、付加される張力が4g未満であれば、保護部材
ヘカプラ部材を固定する際に分岐比の特性が劣化し、付
加される張力が14gを越えると20年以内に破断する。従
って、分岐比の特性を劣化させることなく、長期的（20
年以上の）信頼性を確保する為には4g〜14gであること
が望ましい。In this case, if the applied tension is less than 4 g, the characteristics of the branching ratio are deteriorated when fixing the coupler member to the protective member, and if the applied tension exceeds 14 g, it breaks within 20 years. Therefore, long-term (20
It is desirable to be 4g to 14g to ensure reliability (for more than a year).
以下、この発明の一実施例に係るファイバ形カプラの製
造方法を添付図面に基づき説明する。なお、説明におい
て同一要素には同一符号を用い、重複する説明は省略す
る。A method for manufacturing a fiber coupler according to an embodiment of the present invention will be described below with reference to the accompanying drawings. In the description, the same elements will be denoted by the same reference symbols, without redundant description.
第１図は、この発明の一実施例に係るファイバ形カプラ
の製造方法を示すフローチャートであり、第２図は、こ
のファイバ形カプラの製造工程を示す工程図、第３図
は、ファイバ形カプラの製造装置の概要を示す斜視図で
ある。まず、第３図に基づき、ファイバ形カプラの製造
装置の概要を説明する。FIG. 1 is a flow chart showing a method of manufacturing a fiber type coupler according to an embodiment of the present invention, FIG. 2 is a process diagram showing a manufacturing process of this fiber type coupler, and FIG. 3 is a fiber type coupler. It is a perspective view showing the outline of the manufacturing apparatus of. First, an outline of a fiber coupler manufacturing apparatus will be described with reference to FIG.
光ファイバ心線１、２は、光軸方向に微動できる微動ス
テージ３、４上に固定された第１クランプ部材５、６に
よって把持されている。被覆が除去された部分の下方に
は、バーナ等の加熱器７が配置されている。クランプ部
材５、６の両側には、第２クランプ部材８、９が配置さ
れている。この第２クランプ部材８、９は、張力付加機
構10を介して３方向（光軸方向及び光軸方向と直交する
２方向）に移動できる３方向移動ステージ11に取り付け
られている。この張力付加機構10は、例えば、マイクロ
メータを含んで構成されており、ミクロン単位で第２ク
ランプ部材９を移動させることができる。さらに、第１
クランプ部材６と第２クランプ部材９との間には、張力
測定装置12が取り付けられており、光ファイバに付加さ
れた張力を測定することができる。The optical fiber core wires 1 and 2 are held by the first clamp members 5 and 6 fixed on the fine movement stages 3 and 4 which can be finely moved in the optical axis direction. A heater 7 such as a burner is arranged below the portion where the coating is removed. Second clamp members 8 and 9 are arranged on both sides of the clamp members 5 and 6. The second clamp members 8 and 9 are attached to a three-direction moving stage 11 that can move in three directions (optical axis direction and two directions orthogonal to the optical axis direction) via a tension applying mechanism 10. The tension applying mechanism 10 includes, for example, a micrometer, and can move the second clamp member 9 in units of microns. Furthermore, the first
A tension measuring device 12 is attached between the clamp member 6 and the second clamp member 9 to measure the tension applied to the optical fiber.
次に、第１図に基づき、ファイバ形カプラの製造方法を
説明する。Next, a method of manufacturing the fiber coupler will be described with reference to FIG.
ステップ201では、光ファイバ心線１、２の被覆を一部
除去し、被覆が除去された光ファイバ1a、2aを密着させ
て、第１クランプ部材５、６に設置する（第２図（ａ）
参照）。この場合、光ファイバ1a、2aを互いに捩じり合
わせてもよい。光ファイバ1a、2aをねじり合わせた状態
で保持する場合、必ず、光ファイバ心線１、２の間に密
着部が生じるので、特別な治具（ファイバ保持部材な
ど）が不要であるというメリットがある。しかし、光フ
ァイバ1a、2aが螺旋状に配置されるので、カプラ部材に
おける光伝送損失が大きくなるという欠点がある。一
方、光ファイバ1a、2aを平行に保持する場合、治具が必
要になるが、低損失のカプラ部材を形成できるというメ
リットがある。In step 201, the coatings of the optical fiber cores 1 and 2 are partially removed, and the optical fibers 1a and 2a from which the coatings have been removed are brought into close contact with each other and installed on the first clamp members 5 and 6 (see FIG. )
reference). In this case, the optical fibers 1a and 2a may be twisted together. When holding the optical fibers 1a and 2a in a twisted state, there is always a close contact portion between the optical fiber core wires 1 and 2, so there is an advantage that no special jig (fiber holding member, etc.) is required. is there. However, since the optical fibers 1a and 2a are spirally arranged, there is a drawback that the optical transmission loss in the coupler member increases. On the other hand, when holding the optical fibers 1a and 2a in parallel, a jig is required, but there is an advantage that a coupler member with low loss can be formed.
ステップ202では、バーナ等の加熱器７を用いて密着さ
れた光ファイバ1a、2aを融着し、第１クランプ部材５、
６で光軸方向へと延伸させる（第２図（ｂ）、第３図参
照）。In step 202, the optical fibers 1a and 2a that are brought into close contact with each other by using a heater 7 such as a burner are fused and the first clamp member 5,
The film is stretched in the optical axis direction at 6 (see FIG. 2 (b) and FIG. 3).
ステップ203では、上記融着・延伸の過程において、光
ファイバの一端から入射された光を他端で測定すること
により、光分岐比を検知する。In step 203, the light splitting ratio is detected by measuring the light incident from one end of the optical fiber at the other end in the above fusion / stretching process.
ステップ204では、所定の分岐比が得られたところで、
光ファイバ1a、2aの延伸及び融着を停止させ、カプラ部
Ａを備えたカプラ部材を形成する（第２図（ｃ）参
照）。カプラ部材が形成されたら、第１クランプ部材
５、６を開き、第２クランプ部材８、９で光ファイバを
把持する。In step 204, when the predetermined branching ratio is obtained,
The stretching and fusion of the optical fibers 1a and 2a are stopped to form a coupler member having a coupler portion A (see FIG. 2 (c)). After the coupler member is formed, the first clamp members 5 and 6 are opened, and the optical fibers are held by the second clamp members 8 and 9.
ステップ205では、光ファイバに張力が付加された状態
で、カプラ部材を保護部材13に固定する（第２図（ｄ）
参照）。In step 205, the coupler member is fixed to the protection member 13 while tension is applied to the optical fiber (FIG. 2 (d)).
reference).
以下、第４図に基づき、カプラ部材の固定方法を説明す
る。まず、第２クランプ部材８、９を当該光軸方向へ微
動させることにより、カプラ部材に所定の張力を加える
（同図（ａ）参照）。この場合、張力測定装置12をモニ
タしながら、張力を加えるので、付加張力を調整するこ
とができる。Hereinafter, a method of fixing the coupler member will be described with reference to FIG. First, a predetermined tension is applied to the coupler member by finely moving the second clamp members 8 and 9 in the optical axis direction (see (a) in the figure). In this case, since the tension is applied while monitoring the tension measuring device 12, the applied tension can be adjusted.
次に、張力が付加された状態で、カプラ部材をセラミッ
ク等の保護部材13にエポキシ系樹脂、紫外線硬化型樹脂
等の接着剤で固定する（同図（ｂ）参照）。Next, in a state where tension is applied, the coupler member is fixed to the protective member 13 such as ceramic with an adhesive such as an epoxy resin or an ultraviolet curable resin (see FIG. 2B).
次に、第５図に基づき、上記実施例に係るファイバ形カ
プラの実験結果を説明する。この実験は、ファイバ形カ
プラの延伸工程においてファイバ形カプラにかかる付加
張力と破断時間との関係を示すものである。実験は、張
力を22g、25g、30gについて、それぞれ25、20、10個の
サンプルを作成し、それぞれのうちの１心にLED光源
（波長1.3μｍ）と受光素子を接続しておき、断線が発
生するまでの時間を測定した。断線の有無は、断線する
とLEDの光パワーが伝播されないので、LEDからの光パワ
ーが受光素子で検知されるか否かで判断した。また、こ
の実験で使用したファイバ形カプラは、分岐比50％のフ
ァイバ形カプラであり、波長1.3μｍの伝送光を50％ず
つ分岐するものであった。Next, the experimental results of the fiber type coupler according to the above-mentioned embodiment will be described with reference to FIG. This experiment shows the relationship between the applied tension applied to the fiber coupler and the breaking time in the drawing process of the fiber coupler. In the experiment, 25, 20, and 10 samples were prepared for tensions of 22 g, 25 g, and 30 g, respectively, and the LED light source (wavelength 1.3 μm) and the light receiving element were connected to one core of each, and disconnection occurred. The time to occur was measured. The presence or absence of disconnection is judged by whether or not the light power from the LED is detected by the light receiving element because the light power of the LED is not propagated when the wire is disconnected. The fiber coupler used in this experiment was a fiber coupler with a branching ratio of 50%, and it splits the transmitted light with a wavelength of 1.3 μm by 50%.
この実験によると、20年間断線しない状態を確保する為
には、少なくとも付加張力は14g以下であることがわか
る。しかし、張力が低すぎると、分岐比の特性を劣化さ
せることなく、保護部材に固定することができなくな
る。その為、付加張力は、4g〜14gに設定することが望
ましい。According to this experiment, it is found that the applied tension is at least 14 g or less in order to ensure a state where the wire is not broken for 20 years. However, if the tension is too low, it cannot be fixed to the protective member without deteriorating the characteristics of the branching ratio. Therefore, it is desirable to set the applied tension to 4g to 14g.
なお、この発明は上記実施例に限定されるものではな
い。例えば、分岐比は50％に限定されるものではなく、
単一波長ばかりでなく複数波長の光を伝播するファイバ
形カプラに適用することができる。The present invention is not limited to the above embodiment. For example, the branching ratio is not limited to 50%,
It can be applied to fiber type couplers that propagate not only a single wavelength but also a plurality of wavelengths.
また、カプラ部材を形成する光ファイバ心線として、テ
ープ状光ファイバ心線を使用することができる。A tape-shaped optical fiber core wire can be used as the optical fiber core wire forming the coupler member.
この発明は、以上説明したように構成されているので、
ファイバ形カプラの長期的信頼性を向上させることがで
きる。Since the present invention is configured as described above,
The long-term reliability of the fiber type coupler can be improved.
特に、1.3μｍで光を50％ずつ分岐するファイバ形カプ
ラにおいては、付加張力を４〜14gとすることにより、
長期間にわたり断線しないファイバ形カプラを提供する
ことができる。Especially, in the fiber type coupler that splits the light by 50% at 1.3 μm, by setting the applied tension to 4 to 14 g,
It is possible to provide a fiber type coupler that does not break for a long period of time.
第１図は、この発明の一実施例に係るファイバ形カプラ
の製造方法を示すフローチャート、第２図は、このファ
イバ形カプラの製造工程を示す工程図、第３図は、ファ
イバ形カプラの製造装置の概要を示す斜視図、第４図
は、カプラ部材の固定方法を示す工程図、第５図は、付
加張力と破断時間との関係を示す実験結果を示す図、第
６図は、従来技術に係るファイバ形カプラの製造方法を
示すフローチャートである。 １、２……光ファイバ心線 ３、４……微動ステージ ５、６……第１クランプ部材 ７……加熱器 ８、９……第２クランプ部材 10……張力付加機構 11……３方向移動ステージ 12……張力測定装置 13……保護部材 Ａ……カプラ部FIG. 1 is a flow chart showing a method of manufacturing a fiber coupler according to an embodiment of the present invention, FIG. 2 is a process diagram showing a manufacturing process of this fiber coupler, and FIG. 3 is a manufacturing process of a fiber coupler. FIG. 4 is a perspective view showing an outline of the apparatus, FIG. 4 is a process drawing showing a method of fixing a coupler member, FIG. 5 is a view showing experimental results showing a relationship between applied tension and breaking time, and FIG. It is a flowchart which shows the manufacturing method of the fiber type coupler which concerns on a technique. 1, 2 ... optical fiber core 3, 4 ... fine movement stage 5, 6 ... first clamp member 7 ... heater 8, 9 ... second clamp member 10 ... tension applying mechanism 11 ... 3 directions Moving stage 12 …… Tension measuring device 13 …… Protective member A …… Coupler part
Claims (2)
ァイバを平行に保持した状態で、融着させながら当該光
軸方向へと延伸させ、所定の光分岐比を有するカプラ部
材を形成する第１の工程と、 前記カプラ部材に取り付けられた張力付加測定機構を用
い、前記カプラ部材に当該光軸方向に沿って所定の張力
を加えると共に加えられた張力を測定する第２の工程
と、 前記所定の張力が加えられた状態で、このカプラ部材を
保護部材に固定する第３の工程と、 を含んで構成されるファイバ形カプラの製造方法。1. A coupler member having a predetermined optical branching ratio, wherein at least two or more optical fibers having the coating removed are held in parallel and stretched in the optical axis direction while being fused. A second step of applying a predetermined tension to the coupler member along the optical axis direction and measuring the applied tension by using the tension addition measuring mechanism attached to the coupler member; A third step of fixing the coupler member to the protective member under a predetermined tension applied thereto, and a method for producing a fiber coupler.
記カプラ部材の融着・延伸部が、前記保護部材に接着剤
で固定されることを特徴とする請求項１記載のファイバ
形カプラの製造方法。2. The fiber-type coupler according to claim 1, wherein the tension is 4 g to 14 g, and the fused / stretched portion of the coupler member is fixed to the protective member with an adhesive. Manufacturing method.
Priority Applications (5)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63270009A JPH0666005B2 (en) | 1988-10-26 | 1988-10-26 | Fiber-type turnip manufacturing method |
| US07/421,098 US5013117A (en) | 1988-10-25 | 1989-10-13 | Method for manufacturing a fiber type coupler |
| AU43530/89A AU617547B2 (en) | 1988-10-25 | 1989-10-20 | Method for manufacturing a fiber type coupler |
| EP89119834A EP0366110B1 (en) | 1988-10-25 | 1989-10-25 | Method for manufacturing a fiber type coupler |
| DE68923244T DE68923244T2 (en) | 1988-10-25 | 1989-10-25 | Manufacturing method of a fiber coupler. |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63270009A JPH0666005B2 (en) | 1988-10-26 | 1988-10-26 | Fiber-type turnip manufacturing method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH02115807A JPH02115807A (en) | 1990-04-27 |
| JPH0666005B2 true JPH0666005B2 (en) | 1994-08-24 |
Family
ID=17480280
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP63270009A Expired - Lifetime JPH0666005B2 (en) | 1988-10-25 | 1988-10-26 | Fiber-type turnip manufacturing method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0666005B2 (en) |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0810568B2 (en) * | 1983-02-01 | 1996-01-31 | 古河電気工業株式会社 | Electric power / optical composite cable manufacturing method |
| JPS6165204A (en) * | 1984-09-06 | 1986-04-03 | Hitachi Ltd | Optical star coupler and its manufacturing method |
-
1988
- 1988-10-26 JP JP63270009A patent/JPH0666005B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH02115807A (en) | 1990-04-27 |
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