JPS60140208A - Manufacture of optical demultiplexing and multiplexing circuit - Google Patents
Manufacture of optical demultiplexing and multiplexing circuitInfo
- Publication number
- JPS60140208A JPS60140208A JP58250127A JP25012783A JPS60140208A JP S60140208 A JPS60140208 A JP S60140208A JP 58250127 A JP58250127 A JP 58250127A JP 25012783 A JP25012783 A JP 25012783A JP S60140208 A JPS60140208 A JP S60140208A
- Authority
- JP
- Japan
- Prior art keywords
- optical fibers
- optical
- multiplexing circuit
- quartz glass
- protective member
- 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.)
- Pending
Links
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
- G02B6/2856—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 formed or shaped by thermal heating means, e.g. splitting, branching and/or combining elements
-
- 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】
（技術分野）
本発明は光ファイバを用いた光分岐合波回路の製造方法
に関するものである。DETAILED DESCRIPTION OF THE INVENTION (Technical Field) The present invention relates to a method of manufacturing an optical branching/multiplexing circuit using optical fibers.
（従来技術とその問題点）
光分岐合波回路は、最近の光フアイバ伝送システムの研
究開発により、特に注目を浴びるように光データバスで
の光の分岐、多！＃がある。(Prior art and its problems) Optical branching and multiplexing circuits are attracting particular attention due to the recent research and development of optical fiber transmission systems. There is #.
従来、光ファイバを用いた光分岐合波回路としては２本
の光ファイバ’ｔ１１ａｌ接させ、そのｆｉｌｌ接部分
を加熱して融着したものが開発されている。この光分岐
合波回路の従来例として、１９８１年３月１９日発行の
エレクトロニクス・レターズ（Ｈｌｅｃｔｒｏｎｉｃｓ
Ｌｅｔｔｅｒｓ）、第１７巻、第３号。Conventionally, as an optical branching/multiplexing circuit using optical fibers, a circuit has been developed in which two optical fibers are brought into contact with each other and the fill contact portion is heated and fused. As a conventional example of this optical branching/multiplexing circuit, there is an article in Electronics Letters published on March 19, 1981.
Letters), Volume 17, No. 3.
第２４３頁〜第２４４頁に掲載されているビラレル氏（
０，Ａ、Ｖｉｌｌａｒｒｕｅｌ） 、 モエラ氏（Ｒｏ
ｐ 、Ｍｏｅ １１ｅｒ ）の論文「単一モードファイ
バを融着した光分岐回路Ｊ （Ｆｕｓｅｄ Ｓｉｎｇｌ
ｅ Ｍｏｄｅ Ｆｉｂｒｅ ＡｃｃｅｓｓＯｏｕｐ、１
ｅｒｓ） がある。この例は、２本の単一モードファイ
バの隣接部分を化学エツチングにより、コアの直径程度
にまで細芯化し、互いにねじりながら融着した後に耐熱
ガラス管の中に装荷して光分岐回路を構成したものであ
る。このような方法では、ファイバの隣接部分の直径を
１０マイクロメータ程厩にまで細くするため、できあが
った光分岐回路のファイバの隣接部分は機械的に非常に
弱く、折れ易いという欠点を有していた。Mr. Villarel (published on pages 243-244)
0, A, Villarruel), Mr. Moeller (Ro
``Fused Singl...
eMode Fiber AccessOup, 1
ers). In this example, the adjacent parts of two single-mode fibers are thinned to the same diameter as the core by chemical etching, and after being twisted and fused together, they are loaded into a heat-resistant glass tube to form an optical branch circuit. This is what I did. In this method, the diameter of the adjacent portion of the fiber is reduced to about 10 micrometers, so the adjacent portion of the fiber in the completed optical branch circuit has the disadvantage that it is mechanically very weak and easily breaks. Ta.
（発明の目的）
本発明の目的は光ファイバを用いた光分岐合波回路に於
いて、光ファイバの隣接部分に充分な機械的強度を持た
せ、制作が容易で信頼性のある光分岐合波回路を作製す
る方法を提供する事にある。(Objective of the Invention) An object of the present invention is to provide an optical branching/combining circuit using optical fibers with sufficient mechanical strength in adjacent portions of the optical fibers, which is easy to manufacture and reliable. The purpose of the present invention is to provide a method for fabricating a wave circuit.
（発明の構成）
この発明の光分岐合波回路の製造方法は２本以上の光フ
ァイバとその光ファイバを保護部材で覆い、前記作腹部
拐の中央部を前記光ファイバと一体で加熱伸延すること
により、前記光フアイバ同志を隣接させて細芯化したこ
とを特徴とする構成となっている。(Structure of the Invention) The method for manufacturing an optical branching/multiplexing circuit of the present invention covers two or more optical fibers and the optical fibers with a protective member, and heats and stretches the central part of the fabrication section integrally with the optical fibers. As a result, the structure is characterized in that the optical fibers are arranged adjacent to each other and have thin cores.
（発明の作用効果）
本発明による光分岐合波回路では光ファイバを覆った保
護部材と元ファイバとを共に加熱伸延し、光ファイバの
隣接部分で光フアイバ同志と保護部材が一体となるよう
に融着させているので、光ファイバの隣接部分に充分な
機械的強度を持たせることができる。(Operations and Effects of the Invention) In the optical branching and multiplexing circuit according to the present invention, the protective member covering the optical fiber and the original fiber are both heated and stretched, so that the optical fibers and the protective member are integrated at adjacent portions of the optical fiber. Since the optical fibers are fused, the adjacent portions of the optical fibers can have sufficient mechanical strength.
以下１本発明について図面を参照して詳細に説明する。The present invention will be explained in detail below with reference to the drawings.
（実施例１５
ｗＪ１図は発明の第１の実施例の構成を示す斜祈図、第
２図はその断面図である。この実施例では第１．第２の
光ファイバ１，２を予めねじりながら石英ガラス管３に
挿入し、この石英ガラス管３の中央部を加熱伸延させる
ことによって隣接部分４を形成した。使用した第１．第
２の光ファイバ１．２はコア径１０μＩｎ 、外径１２
５μｍの石英ガラス製ファイバである。また保護部材と
しては・石英ガラスにフッ素を混入し、屈折率を光ファ
イバのコアよりも小さくした内径０．５ ｔｔａｎ 、
外径４−２長さ３ｃｒｎの石英ガラス管３を用いた。第
１．第２の光ファイバ１，２の保護のため、加熱伸延後
、石英ガラス管３の内部の空隙部は樹脂９，１０で固め
た。(Example 15 wJ1 is a perspective view showing the configuration of the first embodiment of the invention, and FIG. 2 is a sectional view thereof. In this embodiment, the first and second optical fibers 1 and 2 are twisted in advance. The adjacent portion 4 was formed by inserting the quartz glass tube 3 into a quartz glass tube 3 and heating and stretching the central portion of the quartz glass tube 3.The first and second optical fibers 1.2 used had a core diameter of 10 μIn and an outer diameter of 12
It is a 5 μm quartz glass fiber. In addition, the protective member is made of quartz glass mixed with fluorine and has an inner diameter of 0.5 ttan, which has a refractive index smaller than the core of the optical fiber.
A quartz glass tube 3 with an outer diameter of 4-2 and a length of 3 crn was used. 1st. In order to protect the second optical fibers 1 and 2, the void inside the quartz glass tube 3 was hardened with resins 9 and 10 after heating and stretching.
加熱伸延によって第１．第２の光ファイバ１゜２の隣接
部分４の外径は１５μｎｌにまで絹くなりた。First, by heating and stretching. The outer diameter of the adjacent portion 4 of the second optical fiber 1°2 was reduced to 15 μnl.
このため隣接部分４で第１．第２の光ファイバ１゜２の
伝搬モード間の結合が可能になり、例えば、第１の光フ
ァイバの入射端５から入射した光ビームを強度比１：１
．２で第１．第２の光ファイバの出射端７．８から取り
出すことができた。Therefore, in the adjacent portion 4, the first . Coupling between the propagation modes of the second optical fiber 1°2 becomes possible, for example, the light beam incident from the input end 5 of the first optical fiber can be combined with an intensity ratio of 1:1.
．． 2 and 1st. It could be taken out from the output end 7.8 of the second optical fiber.
隣接部分４における石英ガラス管３の外径は１■であり
、またこの石英ガラス管３と第１．第２の光ファイバ１
，２は隣接部分４で溶けて一体化している。このため、
隣接部分４の機械的強度は外径が１０〜２０μｍであっ
た従来例に比べてはるかに大きく゛できた。The outer diameter of the quartz glass tube 3 in the adjacent portion 4 is 1.5 mm, and the quartz glass tube 3 and the first. second optical fiber 1
, 2 are melted and integrated at the adjacent portion 4. For this reason,
The mechanical strength of the adjacent portion 4 was much greater than that of the conventional example in which the outer diameter was 10 to 20 μm.
なお第１．第２の光ファイバ１，２のクラッドよりも屈
折率が低い石英ガラス管３は、隣接部分４での光の放射
損失を低減するとともに、第１゜第２の光ファイバ１，
２の加熱伸延時に隣接部分４への不要な物質の付着、混
入を防止して、隣接部分４での光の散乱を起こりにくく
するので、隣接部分４における損失′ｆ、＠：減できる
という新たな特長も得られた。第１の実施例では隣接部
分の損失を５％以下にできた。Note that the first thing. The quartz glass tube 3, which has a lower refractive index than the cladding of the second optical fibers 1 and 2, reduces the radiation loss of light in the adjacent portion 4, and also
2, it is possible to prevent unnecessary substances from adhering to or mixing into the adjacent portion 4 and to make light scattering in the adjacent portion 4 less likely to occur, thereby reducing the loss 'f,@: in the adjacent portion 4. We also obtained some features. In the first example, the loss in the adjacent portion could be reduced to 5% or less.
（実施例２）
第３図は本発明の第２の実施例を示す斜視図である。第
１．第２の光ファイバ１，２は２枚の石英ガラス板１１
．１２の間に平行に瞬接して配置され、この石英ガラス
板１１．１２の中央部をねじ１りながら、加熱伸延して
隣接部分４が形成されている。第１．第２の光ファイバ
１．２には第１の実施例と同じ種類のコア径が１０μｍ
、外径が１２５μｍの石英ガラス製ファイバを用いた。(Embodiment 2) FIG. 3 is a perspective view showing a second embodiment of the present invention. 1st. The second optical fibers 1 and 2 are made of two quartz glass plates 11
．． The quartz glass plates 11 and 12 are placed in parallel and in instant contact between the quartz glass plates 11 and 12, and the adjacent portions 4 are formed by heating and stretching the central portions of the quartz glass plates 11 and 12 while twisting them. 1st. The second optical fiber 1.2 has the same type of core diameter as in the first embodiment, with a core diameter of 10 μm.
A quartz glass fiber with an outer diameter of 125 μm was used.
保護部材としては、屈折率が第１．第２の光ファイバ１
，２のクラッドよりも低い幅１の、長さ３α、厚さ２ｍ
１１１の２枚の石英ガラス板１１．１２を用いている。The protective member has a refractive index of 1. second optical fiber 1
, width 1 lower than the cladding of 2, length 3α, thickness 2m
Two quartz glass plates 11 and 12 of No. 111 are used.
この第２の実施例でも第１の光ファイバ１の入射端５か
ら入射した光ビームを強度比１：１．５で第１．第２の
光ファイバ１，２の出射端７．８から取り出す事ができ
、隣接部分４での損失が８％の光分岐合波回路が得られ
た。また隣接部分４での石英ガラス板１１．１２の厚み
はそれぞれ１＋ｍｎ程度であり、隣接部分４の機械的強
度は第１の実施例と同様、従来のものと比べて充分に大
きくできた。In this second embodiment as well, the light beam incident from the input end 5 of the first optical fiber 1 is transmitted to the first optical fiber 1 at an intensity ratio of 1:1.5. An optical branching/multiplexing circuit was obtained in which the optical fibers could be taken out from the output ends 7.8 of the second optical fibers 1 and 2, and the loss in the adjacent portion 4 was 8%. Further, the thickness of the quartz glass plates 11 and 12 in the adjacent portions 4 was approximately 1+mm, respectively, and the mechanical strength of the adjacent portions 4 was sufficiently increased compared to the conventional one, as in the first embodiment.
不発明に関しては以上の実施例の他にもいろいろな変形
が考えられる。光ファイバは第１．第２の光ファイバ１
．２として２本の光ファイバを用いたが、さらに本数を
増やし、３本以上の光ファイバを用いてもよい。また保
護部材としては管材、板材に限らず、光ファイバの隣接
部分に充分な機械的強度をもたせるものであればよい。Regarding non-invention, various modifications can be considered in addition to the above-mentioned embodiments. Optical fiber is the first. second optical fiber 1
．． Although two optical fibers are used in Example 2, the number may be further increased and three or more optical fibers may be used. Further, the protective member is not limited to a tube material or a plate material, and may be any material that provides sufficient mechanical strength to the adjacent portion of the optical fiber.
例えは、棒状の保護部材を３本用いて、複数の光ファイ
バを包む様に配置し、加熱伸延して光分岐合波回路を構
成してもよい。また棒状の保護部材に溝を設けて溝中に
光ファイバを挿入して、加熱伸延させてもよい。なお、
保護部材の細い個所をさらに補強するには、適当な機械
的強度を持つ材料を補強材として、保護部材の細い個所
に接着あるいは融着してもよい。For example, an optical branching/multiplexing circuit may be constructed by using three rod-shaped protective members, arranged so as to wrap a plurality of optical fibers, and heating and stretching them. Alternatively, a rod-shaped protective member may be provided with a groove, an optical fiber may be inserted into the groove, and the optical fiber may be heated and stretched. In addition,
In order to further strengthen the thin portions of the protective member, a material having an appropriate mechanical strength may be bonded or fused to the thin portions of the protective member as a reinforcing material.
第１図は本発明の第１の実施例により得られた光分岐合
波回路の斜視図、第２図はその断面図、第３図は本発明
の第２の実施例により得られた光分岐合波回路の斜視図
である。ここで１，２は光ファイバ、３は石英ガラス管
、４は隣接部分。
５．６はそれぞれ光ファイバの入射端、７，８はそれぞ
れ光ファイバの１，２の出射端、９．１０は樹脂、１１
．１２は石英ガラス板である。FIG. 1 is a perspective view of an optical branching and multiplexing circuit obtained according to the first embodiment of the present invention, FIG. 2 is a cross-sectional view thereof, and FIG. It is a perspective view of a branching multiplexing circuit. Here, 1 and 2 are optical fibers, 3 is a quartz glass tube, and 4 is an adjacent portion. 5.6 are the input ends of the optical fibers, 7 and 8 are the output ends of the optical fibers 1 and 2, respectively, 9.10 is the resin, and 11
．． 12 is a quartz glass plate.
Claims (1)
護部材の中央部を前記光ファイバと一体で加熱伸延する
ことにより、前記光フアイバ同志を隣接させて細芯化し
たことを特徴とする光分岐合波回路の製造方法。 ２、保護部材として管材を用い、その管材中に光ファイ
バを通すことを特徴とする特許請求の範囲第１項記載の
光分岐合波回路の製造方法。 ３、保護部材として１枚以上の板材を用いた特許請求の
範囲第１項記載の光分岐合波回路の製造方法。 ４、保護部材として、光ファイバのクラッドよりも屈折
率の低い材料を用いたことを特徴とする特許請求の範囲
第１．第２．第３項記載の光分岐合波回路の製造方法。 ５、複数の光ファイバを予めねじって１．保換部材で覆
った後、加熱伸延式せることを特徴とする特許請求の範
囲第１項〜第４項記載の光分岐合波回路の製造方法。 ６、保護部材の加熱伸延部をねじりながら加熱伸延させ
ることを特徴とする特許請求の範囲第１項〜第４項記載
の光分岐合波回路の製造方法。1. Two or more optical fibers are covered with a protective member, and the central portion of the protective member is heated and stretched together with the optical fibers, thereby making the optical fibers adjacent to each other and thinned. A method for manufacturing an optical branching/multiplexing circuit. 2. A method for manufacturing an optical branching/multiplexing circuit according to claim 1, characterized in that a tube material is used as the protective member and an optical fiber is passed through the tube material. 3. A method of manufacturing an optical branching/multiplexing circuit according to claim 1, wherein one or more plate members are used as the protective member. 4. Claim 1, characterized in that the protective member is made of a material with a lower refractive index than the cladding of the optical fiber. Second. 4. A method for manufacturing an optical branching/multiplexing circuit according to item 3. 5. Pre-twist multiple optical fibers 1. 5. A method of manufacturing an optical branching/multiplexing circuit according to claims 1 to 4, characterized in that the optical branching/multiplexing circuit is covered with a retaining member and then heated and stretched. 6. A method of manufacturing an optical branching and multiplexing circuit according to claims 1 to 4, wherein the heating and stretching portion of the protective member is heated and stretched while being twisted.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP58250127A JPS60140208A (en) | 1983-12-27 | 1983-12-27 | Manufacture of optical demultiplexing and multiplexing circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP58250127A JPS60140208A (en) | 1983-12-27 | 1983-12-27 | Manufacture of optical demultiplexing and multiplexing circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS60140208A true JPS60140208A (en) | 1985-07-25 |
Family
ID=17203222
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP58250127A Pending JPS60140208A (en) | 1983-12-27 | 1983-12-27 | Manufacture of optical demultiplexing and multiplexing circuit |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS60140208A (en) |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0213829A2 (en) * | 1985-08-15 | 1987-03-11 | Corning Glass Works | Fiber optic coupler and method |
| JPS6344607A (en) * | 1986-08-13 | 1988-02-25 | Hitachi Ltd | Plastic optical fiber coupler and its manufacture |
| EP0274686A2 (en) * | 1987-01-16 | 1988-07-20 | Allied Corporation | Fiber optic coupler using frit |
| WO1988009517A1 (en) * | 1987-05-22 | 1988-12-01 | Aster Corporation | Electro-optical converter |
| US4799949A (en) * | 1985-08-15 | 1989-01-24 | Corning Glass Works | Method of making low loss fiber optic coupler |
| US4902323A (en) * | 1988-10-24 | 1990-02-20 | Corning Incorporated | Method of making fiber optic coupler |
| US4902324A (en) * | 1988-07-25 | 1990-02-20 | Corning Incorporated | Method of reproducibly making fiber optic coupler |
| US4931076A (en) * | 1987-08-07 | 1990-06-05 | Corning Incorporated | Method of making fiber optic coupler |
| US5031300A (en) * | 1989-06-15 | 1991-07-16 | Corning Incorporated | Method of making optical devices |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5587111A (en) * | 1978-12-20 | 1980-07-01 | Int Standard Electric Corp | Optical fiber directional coupler |
| JPS5660908U (en) * | 1979-10-18 | 1981-05-23 | ||
| JPS57186730A (en) * | 1981-05-13 | 1982-11-17 | Nippon Telegr & Teleph Corp <Ntt> | Manufacture of optical distributor |
-
1983
- 1983-12-27 JP JP58250127A patent/JPS60140208A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5587111A (en) * | 1978-12-20 | 1980-07-01 | Int Standard Electric Corp | Optical fiber directional coupler |
| JPS5660908U (en) * | 1979-10-18 | 1981-05-23 | ||
| JPS57186730A (en) * | 1981-05-13 | 1982-11-17 | Nippon Telegr & Teleph Corp <Ntt> | Manufacture of optical distributor |
Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4799949A (en) * | 1985-08-15 | 1989-01-24 | Corning Glass Works | Method of making low loss fiber optic coupler |
| EP0213829A3 (en) * | 1985-08-15 | 1987-11-11 | Corning Glass Works | Fiber optic coupler and method |
| EP0213829A2 (en) * | 1985-08-15 | 1987-03-11 | Corning Glass Works | Fiber optic coupler and method |
| US4773924A (en) * | 1985-08-15 | 1988-09-27 | Corning Glass Works | Fiber optic coupler and method |
| US4948217A (en) * | 1985-08-15 | 1990-08-14 | Corning Incorporated | Optic coupler |
| JPS6344607A (en) * | 1986-08-13 | 1988-02-25 | Hitachi Ltd | Plastic optical fiber coupler and its manufacture |
| EP0274686A2 (en) * | 1987-01-16 | 1988-07-20 | Allied Corporation | Fiber optic coupler using frit |
| US4844573A (en) * | 1987-05-22 | 1989-07-04 | Aster Corporation | Electro-optical converter including ridgid support for optical fiber coupler, telephone set using the coupler and method of making same |
| WO1988009517A1 (en) * | 1987-05-22 | 1988-12-01 | Aster Corporation | Electro-optical converter |
| US5067787A (en) * | 1987-05-22 | 1991-11-26 | Aster Corporation | Electro-optical converter |
| US4931076A (en) * | 1987-08-07 | 1990-06-05 | Corning Incorporated | Method of making fiber optic coupler |
| US4902324A (en) * | 1988-07-25 | 1990-02-20 | Corning Incorporated | Method of reproducibly making fiber optic coupler |
| US4902323A (en) * | 1988-10-24 | 1990-02-20 | Corning Incorporated | Method of making fiber optic coupler |
| US5031300A (en) * | 1989-06-15 | 1991-07-16 | Corning Incorporated | Method of making optical devices |
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