JPS58110439A - Manufacture of constant polarization type optical fiber - Google Patents
Manufacture of constant polarization type optical fiberInfo
- Publication number
- JPS58110439A JPS58110439A JP56207321A JP20732181A JPS58110439A JP S58110439 A JPS58110439 A JP S58110439A JP 56207321 A JP56207321 A JP 56207321A JP 20732181 A JP20732181 A JP 20732181A JP S58110439 A JPS58110439 A JP S58110439A
- Authority
- JP
- Japan
- Prior art keywords
- optical fiber
- base material
- preform
- constant polarization
- quartz glass
- 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
Classifications
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B37/00—Manufacture or treatment of flakes, fibres, or filaments from softened glass, minerals, or slags
- C03B37/01—Manufacture of glass fibres or filaments
- C03B37/012—Manufacture of preforms for drawing fibres or filaments
- C03B37/01205—Manufacture of preforms for drawing fibres or filaments starting from tubes, rods, fibres or filaments
- C03B37/01211—Manufacture of preforms for drawing fibres or filaments starting from tubes, rods, fibres or filaments by inserting one or more rods or tubes into a tube
- C03B37/01217—Manufacture of preforms for drawing fibres or filaments starting from tubes, rods, fibres or filaments by inserting one or more rods or tubes into a tube for making preforms of polarisation-maintaining optical fibres
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B2203/00—Fibre product details, e.g. structure, shape
- C03B2203/30—Polarisation maintaining [PM], i.e. birefringent products, e.g. with elliptical core, by use of stress rods, "PANDA" type fibres
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Optical Fibers, Optical Fiber Cores, And Optical Fiber Bundles (AREA)
- Glass Melting And Manufacturing (AREA)
- Manufacture, Treatment Of Glass Fibers (AREA)
Abstract
Description
【発明の詳細な説明】
本発明は光通信等に用いられる光ファイバの製造方法に
係り、特に、偏波面を採石する定偏波光ファイバの製造
方法に関するものである。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method of manufacturing an optical fiber used for optical communications, and more particularly, to a method of manufacturing a polarization-constant optical fiber in which the plane of polarization is quarried.
一般に用いられている牟−七−ドの光ファイバに直交す
る一対の偏波面を形成させるには次のような２つの方法
がある。その１つはコアの岬［面形状を楕円又は長円形
に形成する方法であり、他の方法は直交する直径の方向
に異り性の歪を与えて直交する２軸方向に屈折率差を生
じさせる方法である。There are two methods for forming a pair of orthogonal polarization planes in a commonly used square-seven-mode optical fiber. One method is to form the cape of the core into an elliptical or oval shape, and the other method is to apply a differentiating strain in the orthogonal diameter direction to create a refractive index difference in two orthogonal axes. This is a method to make it happen.
前者のコア断面形状を楕円等に形成させる方法としては
、単一モ゛−ドの光ファイバのクラッドの両側を研削し
て矩形状に形成するとい９−う精凱ガラス加工が必要で
ある。また、この加工した光ファイバは研削した所に一
対のガラスロンドを縦添えしてガラスチューブに収容し
、加熱して一体に溶着させる工程が必要となる。The former method of forming the core cross-sectional shape into an ellipse or the like requires nine-step precision glass processing in which both sides of the cladding of a single mode optical fiber are ground to form a rectangular shape. Further, the processed optical fiber requires a step of vertically attaching a pair of glass ronds to the ground portion, housing the fibers in a glass tube, and welding them together by heating.
第１図は光フアイバ母材の断面図、第２図は第１図の光
フアイバ母材を用いた従来の定偏波光７アイパの中間状
態の断面図である。プリ７オームコア１の周囲は石英ガ
ラス製のプリフォームクラッド２によって包囲されて光
フアイバ母材３を構成している。この光フアイバ母材３
を上下より研削して第２図の中心部材４を形成して石英
ガラス管５内に挿入し、更に石英ガラス管５の内壁と中
心部材４との間には石英ガラス棒６ａ、 ６ｂを挿入し
ている。これを一体に加熱すれば第５図に示すような定
偏波光フアイバ母材１０が得られ、更に加熱して巌引き
すると第６図に実線で示すような定偏波光ファイバ１０
が得られる。FIG. 1 is a cross-sectional view of an optical fiber base material, and FIG. 2 is a cross-sectional view of an intermediate state of a conventional polarized light seven-eyeper using the optical fiber base material of FIG. 1. The periphery of the pre-7 ohm core 1 is surrounded by a preform cladding 2 made of quartz glass to constitute an optical fiber base material 3. This optical fiber base material 3
is ground from above and below to form the center member 4 shown in FIG. 2, which is inserted into the quartz glass tube 5, and further, quartz glass rods 6a and 6b are inserted between the inner wall of the quartz glass tube 5 and the center member 4. are doing. If this is heated together, a constant polarization optical fiber preform 10 as shown in FIG. 5 will be obtained, and if further heated and rolled, a constant polarization optical fiber 10 as shown by the solid line in FIG. 6 will be obtained.
is obtained.
このような従来の定偏波光ファイバの製造法は、第２図
の中心部材４の研削したプリ７オームクラノド２と縦添
えしたガラスロッド６との融着が不十分となり易く、長
手方向の均一性を保つことが困難である。また、光フア
イバ母材３を研削して中心部材４を加工するのに時間を
要するという欠点をもっていた。In such a conventional manufacturing method of a constant polarization optical fiber, the fusion between the ground pre-7 ohm cranoid 2 of the center member 4 shown in FIG. difficult to maintain. Another disadvantage is that it takes time to grind the optical fiber base material 3 and process the central member 4.
本発明は上記従来技術の欠点を解消し、直交する光軸に
おける偏波を正確に保有させることができる定偏波光フ
ァイバのｄ 、（１カ法を提供することを目的とし、そ
の特徴とするところは、長手方向の両側にサドル状の溝
を形成した光フアイバ母材と、この光ファイバ母相の隅
に献金する一対のガラスロッドとの徐合体をｂ！にニガ
７ス舌内に挿入して加熱溶融させることにより定偏波光
フアイバ母材を形成し、この足回波光ファイバ母相を加
熱して線引きすることにある。The present invention aims to eliminate the drawbacks of the above-mentioned prior art and to provide a polarization-constant optical fiber that can accurately maintain polarization in orthogonal optical axes, and has the following characteristics: However, the slow coalescence of an optical fiber base material with saddle-shaped grooves formed on both sides in the longitudinal direction and a pair of glass rods attached to the corners of this optical fiber matrix was inserted into the tongue at b! The purpose is to form a constant polarization optical fiber preform by heating and melting the preform, and then heating and drawing this leg wave optical fiber preform.
第１図、第３図、第４図、第５層、第６図は本発明の一
実施例である定偏波光ファイバの製造法の説明図である
。光ファイバ母１１’ ３の両側にサドル状の溝を加工
してガラスロッド６ａ、 ６ｂを嵌入させ、適当な方法
で密着させて中心部月４を構成させる。次に、この中心
部材４を石英ガラス管５内に設置して第４図の状態とし
、全体を加熱融着させると第５図のごとく一体化されて
定偏波光フアイバ母材９の作る。即ち、石英カラス層８
で中心部材４を密着包囲している。FIG. 1, FIG. 3, FIG. 4, the fifth layer, and FIG. 6 are explanatory diagrams of a method for manufacturing a polarization-constant optical fiber according to an embodiment of the present invention. Saddle-shaped grooves are machined on both sides of the optical fiber motherboard 11'3, glass rods 6a and 6b are inserted into the grooves, and the glass rods 6a and 6b are brought into close contact with each other by an appropriate method to form the central moon 4. Next, this central member 4 is placed in a quartz glass tube 5 to form the state shown in FIG. 4, and the whole is heated and fused to form a uniform polarization optical fiber base material 9 as shown in FIG. That is, the quartz glass layer 8
The central member 4 is closely surrounded by the core member 4.
このようにして形成した定偏波光フアイバ母材９を加熱
線引きすると、第１０図に拡大断面図として示したごと
く中心にコア７を楕円クラッド１１で包囲し、その周囲
を更に石英ガラス層８で被覆した定偏波光ファイバ１０
が得られる。即ち、プリフォームクラッド２の形状が線
引きすることによって楕円クラッド１１のような断面形
状となり、横縦方向の直交する方向に歪を与えて屈折率
差を生じさせている。When the constant polarization optical fiber base material 9 thus formed is heated and drawn, the core 7 is surrounded by an elliptical cladding 11 at the center as shown in the enlarged cross-sectional view in FIG. Coated polarization constant optical fiber 10
is obtained. That is, by drawing the shape of the preform cladding 2, it becomes a cross-sectional shape like the elliptical cladding 11, and distortion is applied in a direction orthogonal to the horizontal and vertical directions, thereby causing a difference in refractive index.
また、第５図の段階でプリフォームクラッド２の溝に密
着させたガラスロッド６は硼硅酸ガラスで作られたもの
であり、光フアイバ母材５はＭＣＶＤ法で作製したもの
である。なお、プリフォームコア１はＶＡＤ法で作製し
、その後ロッドイン法で形成することもできるし、Ｇｅ
Ｃｈ 十ＳＳ Ｑ２系ガラスで、楕円クラッド１１と
の屈折率差は０．７チとし、波長１．３μｍで規格化周
波数Ｖがほぼ２．２となるようなコア径に線引きして製
造することができる。Further, the glass rod 6 that was brought into close contact with the groove of the preform cladding 2 at the stage shown in FIG. 5 was made of borosilicate glass, and the optical fiber base material 5 was made by the MCVD method. Note that the preform core 1 can be produced by the VAD method and then formed by the rod-in method, or
Ch 10 SS Q2 series glass, with a refractive index difference of 0.7 inches with the elliptical cladding 11, and manufactured by drawing to a core diameter such that the normalized frequency V is approximately 2.2 at a wavelength of 1.3 μm. I can do it.
本実施例の定偏波光ファイバの製造法は、中心にプリフ
ォームコアを有するプリフォームクラッドの両側にサド
ル状の溝を形成させてカラスロッドを密着させた中心部
材を製作し、この中心部材を石英ガラスロッドに挿入し
てＬＭ熱中実化し−・体とした後に線引きすることによ
って、次のような効果が得られる。The manufacturing method of the constant polarization optical fiber of this example involves manufacturing a central member in which saddle-shaped grooves are formed on both sides of a preform cladding having a preform core at the center, and a glass rod is tightly attached to the preform cladding. The following effects can be obtained by inserting it into a quartz glass rod, turning it into a LM solid body, and then drawing it into a wire.
（ｊ） プリフォームクラッド２とカラスロッド６と
の接合が安定しているので、製品化した時の楕円クラッ
ド１１の断面形状が長手方向で一様となる。その結呆定
偏波性が長尺区間伝搬しても減衰することがない。(j) Since the bond between the preform clad 2 and the crow rod 6 is stable, the cross-sectional shape of the elliptical clad 11 when manufactured into a product is uniform in the longitudinal direction. Its fixed polarization property does not attenuate even if it propagates over a long section.
（２） カラスロッドの外径やサドル寸法を選択すす
ることによって、結合長（定偏波性の目安となるもので
ビート長ともいう）を制御することができる。(2) By selecting the outer diameter and saddle dimensions of the glass rod, the coupling length (which is a measure of polarization stability and is also referred to as beat length) can be controlled.
（３） プリフォームの加工を最小限に縮少すること
ができるので、経済的である。(3) It is economical because the processing of the preform can be minimized.
（４） 伝送損失特性はブリブオーム自体で決定し、
しかも加工量が少いので、プリフォームの特性が定偏波
光ファイバの状態まで保存される。(4) The transmission loss characteristics are determined by the blib ohm itself,
Moreover, since the amount of processing is small, the characteristics of the preform can be preserved to the state of a polarization-controlled optical fiber.
上記実施例は第１図のような２重構造の光フアイバ母材
から出発して製造しているが、第６図に示すような３重
構造の光フアイバ母材を作り、その楕円クラッド１１の
長径方向に破線で示す一対のガラスロッドを付け、プリ
フォームクラッド２の定例波性を助長するような構造の
ものも含まれる。The above embodiment is manufactured starting from an optical fiber base material with a double structure as shown in FIG. 1, but an optical fiber base material with a triple structure as shown in FIG. It also includes a structure in which a pair of glass rods shown by broken lines are attached in the longitudinal direction of the preform cladding 2 to promote regular corrugation of the preform cladding 2.
本発明の定偏波光ファイバの製造法は、高性能の光ファ
イバを能率良く製造できるという効果が得られる。The method for manufacturing a constant polarization optical fiber of the present invention has the effect of efficiently manufacturing a high-performance optical fiber.
第１図は光フアイバ母材の断面図、第２図は第１図の光
フアイバ母材を用いた従来の定偏波光ファイバの中間状
態の断面図、第３図は本発明の一実施例である”中心部
材の断面図、第４図は第３図の中心部材を石英ガラス管
内に挿入した状態の断面図、第５図は第４図のものを溶
融中実化した定偏波光フアイバ母材の断面図、第６図は
第５図の定例波光ファイバ母材を線引きした定偏波光フ
ァイバの断面図である。
１・・・プリフォーム、コア、２・−・プリフォームク
ラッド、３・・・光フアイバ母材、４・・・中心部材、
５・・・石英ガラス管、６・・・ガラスロッド、７・・
・コア、８・・石英ガラス層、９・・・定偏波光フアイ
バ母材、１０・・・定偏波光ファイバ、１１・・・ｈ円
りシノド。
Ｔｚ の
６番
１＋ ｎ
１′５ 図
７１ ロ
ーＩＦ−３図
〒 ４ 図
（FIG. 1 is a sectional view of an optical fiber base material, FIG. 2 is a sectional view of a conventional polarization-controlled optical fiber in an intermediate state using the optical fiber base material of FIG. 1, and FIG. 3 is an embodiment of the present invention. Figure 4 is a cross-sectional view of the central member shown in Figure 3 inserted into a quartz glass tube, and Figure 5 is a polarization-controlled optical fiber obtained by melting and solidifying the central member shown in Figure 4. 6 is a sectional view of a constant polarization optical fiber drawn from the regular wave optical fiber base material of FIG. 5. 1... Preform, core, 2... Preform cladding, 3 ... Optical fiber base material, 4... Central member,
5... Quartz glass tube, 6... Glass rod, 7...
- Core, 8... Quartz glass layer, 9... Constant polarization optical fiber base material, 10... Constant polarization optical fiber, 11... h circular synod. Tz No. 6 1+ n 1'5 Figure 71 Low IF-3 Figure 4 Figure (
Claims (1)
バ母材と、この光フアイバ母材の上記溝に嵌合する一対
のガラスロンドとの複合体をガラス管内に挿入して加熱
溶融させることにより定偏波光フアイバ母材を形成し、
この定備波光ファイバ母材を加熱して線引きすることを
特徴とする定偏波光ファイバの製造方法。 ２ 上記光ファイバ母材に形成したサドル状の溝が、上
記光フアイバ母材の両側を切削加工した溝である特許請
求の範囲第１項記載の定偏波光ファイバの製造方法。 ３ 上記光フアイバ母材に形成したサドル状の溝が、ゾ
ルゲル法で上記光フアイバ母材を製作する際に形成した
溝である特許請求の範囲第１項記載の定例−Ｕファイバ
の製造法。[Claims] 1. A composite body consisting of an optical fiber base material with saddle-shaped grooves formed on both sides in the longitudinal direction and a pair of glass ronds that fit into the grooves of the optical fiber base material is inserted into a glass tube. By heating and melting, a constant polarization optical fiber base material is formed.
A method for producing a constant polarization optical fiber, which comprises heating and drawing the constant wave optical fiber preform. 2. The method of manufacturing a polarization-controlled optical fiber according to claim 1, wherein the saddle-shaped groove formed in the optical fiber preform is a groove formed by cutting both sides of the optical fiber preform. 3. The method for manufacturing a regular-U fiber according to claim 1, wherein the saddle-shaped groove formed in the optical fiber preform is a groove formed when manufacturing the optical fiber preform by a sol-gel method.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP56207321A JPS58110439A (en) | 1981-12-22 | 1981-12-22 | Manufacture of constant polarization type optical fiber |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP56207321A JPS58110439A (en) | 1981-12-22 | 1981-12-22 | Manufacture of constant polarization type optical fiber |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS58110439A true JPS58110439A (en) | 1983-07-01 |
| JPH0130768B2 JPH0130768B2 (en) | 1989-06-21 |
Family
ID=16537827
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP56207321A Granted JPS58110439A (en) | 1981-12-22 | 1981-12-22 | Manufacture of constant polarization type optical fiber |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS58110439A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS58145631A (en) * | 1982-02-19 | 1983-08-30 | Furukawa Electric Co Ltd:The | Manufacture of single polarization optical fiber preform having channels with asymmetric refractive index |
| JPS60186432A (en) * | 1984-03-02 | 1985-09-21 | Sumitomo Electric Ind Ltd | Manufacture of polarization-maintaining fiber |
| JPS60260442A (en) * | 1984-06-06 | 1985-12-23 | Sumitomo Electric Ind Ltd | Preparation of fixed polarisation fiber |
| EP0732309A2 (en) * | 1990-11-09 | 1996-09-18 | Corning Incorporated | Method of making polarization retaining fiber |
-
1981
- 1981-12-22 JP JP56207321A patent/JPS58110439A/en active Granted
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS58145631A (en) * | 1982-02-19 | 1983-08-30 | Furukawa Electric Co Ltd:The | Manufacture of single polarization optical fiber preform having channels with asymmetric refractive index |
| JPH024538B2 (en) * | 1982-02-19 | 1990-01-29 | Furukawa Electric Co Ltd | |
| JPS60186432A (en) * | 1984-03-02 | 1985-09-21 | Sumitomo Electric Ind Ltd | Manufacture of polarization-maintaining fiber |
| JPS6365615B2 (en) * | 1984-03-02 | 1988-12-16 | Sumitomo Electric Industries | |
| JPS60260442A (en) * | 1984-06-06 | 1985-12-23 | Sumitomo Electric Ind Ltd | Preparation of fixed polarisation fiber |
| EP0732309A2 (en) * | 1990-11-09 | 1996-09-18 | Corning Incorporated | Method of making polarization retaining fiber |
| EP0732309A3 (en) * | 1990-11-09 | 1997-03-26 | Corning Inc | Method of making polarization retaining fiber |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0130768B2 (en) | 1989-06-21 |
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