JPH0776104B2 - Method of manufacturing constant polarization optical fiber - Google Patents
Method of manufacturing constant polarization optical fiberInfo
- Publication number
- JPH0776104B2 JPH0776104B2 JP60148269A JP14826985A JPH0776104B2 JP H0776104 B2 JPH0776104 B2 JP H0776104B2 JP 60148269 A JP60148269 A JP 60148269A JP 14826985 A JP14826985 A JP 14826985A JP H0776104 B2 JPH0776104 B2 JP H0776104B2
- Authority
- JP
- Japan
- Prior art keywords
- core
- stress
- base material
- optical fiber
- 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.)
- Expired - Fee Related
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
- C03B37/01225—Means for changing or stabilising the shape, e.g. diameter, of tubes or rods in general, e.g. collapsing
- C03B37/01228—Removal of preform material
- C03B37/01231—Removal of preform material to form a longitudinal hole, e.g. by drilling
-
- 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
- C03B37/00—Manufacture or treatment of flakes, fibres, or filaments from softened glass, minerals, or slags
- C03B37/01—Manufacture of glass fibres or filaments
- C03B37/02—Manufacture of glass fibres or filaments by drawing or extruding, e.g. direct drawing of molten glass from nozzles; Cooling fins therefor
- C03B37/025—Manufacture of glass fibres or filaments by drawing or extruding, e.g. direct drawing of molten glass from nozzles; Cooling fins therefor from reheated softened tubes, rods, fibres or filaments, e.g. drawing fibres from preforms
- C03B37/027—Fibres composed of different sorts of glass, e.g. glass optical fibres
- C03B37/02754—Solid fibres drawn from hollow preforms
-
- 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
- G02B6/10—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings of the optical waveguide type
- G02B6/105—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings of the optical waveguide type having optical polarisation effects
-
- 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
- C03B2203/31—Polarisation maintaining [PM], i.e. birefringent products, e.g. with elliptical core, by use of stress rods, "PANDA" type fibres by use of stress-imparting rods, e.g. by insertion
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Geochemistry & Mineralogy (AREA)
- Manufacturing & Machinery (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Organic Chemistry (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Optical Fibers, Optical Fiber Cores, And Optical Fiber Bundles (AREA)
- Glass Melting And Manufacturing (AREA)
- Manufacture, Treatment Of Glass Fibers (AREA)
Description
【発明の詳細な説明】 （産業上の利用分野） 本発明は、コヒーレント光通信や、光応用計測等におい
て用いられる定偏波光フアイバの製法に関する。TECHNICAL FIELD The present invention relates to a method for manufacturing a constant polarization optical fiber used in coherent optical communication, optical application measurement, and the like.
（従来の技術） 第１図に定偏波光フアイバの構造の一例を示す。第１図
において、１はコア、２はクラツド、３は応力付与部で
あり、図では簡単に２本の例を示し3a,3bとする。一般
に、コア１は、GeO2が添加されたSiO2ガラス、クラツド
２はSiO2ガラス、応力付与部３はB2O3が添加された石英
ガラスであり、応力付与部材はコア、クラツドより熱膨
脹係数の大きいものが用いられる。(Prior Art) FIG. 1 shows an example of the structure of a constant polarization optical fiber. In FIG. 1, 1 is a core, 2 is a cladding, and 3 is a stress applying portion, and in the figure, two examples are simply shown as 3a and 3b. In general, the core 1 is SiO 2 glass added with GeO 2 , the cladding 2 is SiO 2 glass, and the stress applying portion 3 is quartz glass added with B 2 O 3 , and the stress applying member is thermally expanded from the core and the cladding. The one with a large coefficient is used.
第３図は、第１図に示した構造を実現する従来の製法の
説明図である。まずコア・クラツド−ガラス（コアガラ
ス１′とクラツドガラス２′）から成るコア母材11に超
音波加工により穴4a,4bをあけ、応力付与部材３′a,3′
ｂを穴4a,4bに挿入する。その後、コア母材11と応力付
与部材３′a,3′ｂを加熱一体化後線引、もしくは、コ
ア母材11の一端を閉じた後、穴内を減圧しながら線引を
行ない、第１図のフアイバを得る。FIG. 3 is an explanatory view of a conventional manufacturing method for realizing the structure shown in FIG. First, holes 4a and 4b are formed in the core base material 11 made of core-clad glass (core glass 1'and cladding glass 2 ') by ultrasonic processing, and stress applying members 3'a and 3'.
Insert b into holes 4a and 4b. After that, the core base material 11 and the stress-applying members 3'a and 3'b are heated and integrated and then drawn, or one end of the core base material 11 is closed and then the wire is drawn while decompressing the inside of the hole. Obtain the fiber shown.
第１図の構造のフアイバでは、応力付与部材の熱膨脹に
よつてコアに異方性応力を与え、複屈折性を得る。した
がつて、応力付与部材３′a,3′ｂを、コア母材11の熱
膨脹係数差が大きい程、大きな複屈折が得られ、高度な
偏波保持能力が生じる。しかし、熱膨脹率が大きく異な
るガラス同志を加熱一体化した場合、ガラスが冷却され
ると熱膨脹差のために大きな歪が発生し、ガラスにクラ
ツクが生ずる。このため、応力付与部材とコア母材を加
熱一体化した後線引を行う第３図の方法は、応力付与部
材とコア母材の熱膨脹率差を大きくするには好ましい方
法ではない。In the fiber having the structure shown in FIG. 1, thermal expansion of the stress-applying member gives anisotropic stress to the core to obtain birefringence. Therefore, the larger the difference in the coefficient of thermal expansion between the core preforms 11 of the stress imparting members 3'a and 3'b, the greater the birefringence obtained, and the higher the polarization maintaining ability. However, in the case where two glasses having different thermal expansion coefficients are heated and integrated with each other, when the glass is cooled, a large strain is generated due to the difference in thermal expansion, and the glass is cracked. Therefore, the method of FIG. 3 in which the stress applying member and the core preform are heated and integrated and then drawing is not preferable for increasing the difference in thermal expansion coefficient between the stress applying member and the core preform.
上記の欠点、すなわちクラツクの発生を防ぐために孔内
を減圧しながら線引を行い、プリフオームを加熱一体化
すると同時にフアイバ化してしまう方法がある。この方
法としては従来第４図のような方法が一般に知られてい
る。第４図は、第３図に示したプリフオームに、石英管
５を融着し、孔内を真空ポンプを用いて減圧しながら線
引を行う方法である。なお９は線引炉をあらわす。この
ように減圧することにより気泡の発生を防ぐことができ
る。In order to prevent the above-mentioned drawback, that is, cracking, there is a method in which wire drawing is performed while depressurizing the inside of the hole, and the preform is heated and integrated, and at the same time fiberized. As this method, the method shown in FIG. 4 has been generally known. FIG. 4 shows a method in which the quartz tube 5 is fused to the preform shown in FIG. 3 and wire drawing is performed while depressurizing the inside of the hole using a vacuum pump. In addition, 9 represents a drawing furnace. By reducing the pressure in this way, the generation of bubbles can be prevented.
（発明が解決しようとする問題点） ところで第１図の構造のフアイバにおいて応力付与部３
にはB2O3を添加した石英ガラスが用いられる。B2O3添加
石英ガラスの添加濃度と軟化点温度は、特開昭52−3354
6号公報に記載されるように第５図に示す関係があるこ
とが知られている。第５図からわかるように、B2O3がた
とえば15重量％添加されている場合、軟化点温度は約12
50℃であり、石英ガラスの軟化点温度より、約350℃低
くなる。線引時の温度は約2000℃であるから、線引時に
は、コア母材11に比べ、応力付与部材３′a,3′ｂの粘
度は小さくなつている。このため、線引中には応力付与
部材３′a,3′ｂは、第４図に示すように、上に絞り出
されてしまう。これは、応力付与部3a,3bの面積の減少
や、応力付与部3a,3bの変形を引き起こし、偏波特性の
極めて悪い定偏波光フアイバとなる欠点があつた。すな
わち第４図の方法でも未だ偏波特性の良い定偏波フアイ
バを得ることは困難であつた。(Problems to be Solved by the Invention) By the way, in the fiber having the structure shown in FIG.
For this, quartz glass to which B 2 O 3 is added is used. B 2 O 3 additive concentration and the softening point temperature of the doped silica glass, Sho 52-3354
It is known that the relationship shown in FIG. As can be seen from FIG. 5, when B 2 O 3 is added at, for example, 15% by weight, the softening point temperature is about 12
It is 50 ° C, which is about 350 ° C lower than the softening point temperature of quartz glass. Since the temperature at the time of drawing is about 2000 ° C., the viscosity of the stress applying members 3′a and 3′b becomes smaller than that of the core base material 11 at the time of drawing. Therefore, during drawing, the stress imparting members 3'a and 3'b are squeezed upward as shown in FIG. This causes a decrease in the area of the stress imparting portions 3a and 3b and deformation of the stress imparting portions 3a and 3b, resulting in a drawback that a polarization maintaining optical fiber having extremely poor polarization characteristics is obtained. That is, even with the method of FIG. 4, it was still difficult to obtain a constant polarization fiber having good polarization characteristics.
本発明は、線引時に応力付与部材とコア母材の加熱一体
化を行ないながら、線引を行ない、かつ、応力付与部の
変形をほとんど皆無とする、定偏波光フアイバの新規な
製造方法に関するもので、良好な偏波保持能力を有する
定偏波光フアイバを実現できる方法を提供することを目
的としている。The present invention relates to a novel method for manufacturing a polarization-maintaining optical fiber in which a stress applying member and a core base material are heated and integrated during drawing, and drawing is performed, and deformation of the stress applying portion is almost eliminated. However, it is an object of the present invention to provide a method capable of realizing a constant polarization optical fiber having a good polarization maintaining ability.
（問題点を解決するための手段） 本発明は石英ガラスを主成分とするコアと、石英ガラス
から成るクラツドと該コアの両側にコアを中心として対
称に配置された２本以上の偶数本の、石英ガラスを主成
分とする応力付与部から成る定偏波光フアイバの作製に
おいて、コア・クラツド−ガラスから成るコア母材に応
力付与部用母材の形状にあわせて穴をあけ、該穴に前記
応力付与部用母材を挿入し、次に該応力付与部用母材の
軸方向に圧力を加えながら減圧下応力付与部用母材とコ
ア母材を加熱一体化しながら同時に線引を行い、定偏波
光フアイバを得ることを特徴とする定偏波光フアイバの
製造方法に関する。(Means for Solving the Problems) The present invention relates to a core containing silica glass as a main component, a cladding made of silica glass, and two or more even-numbered cores symmetrically arranged on both sides of the core. , In the production of a polarization-maintaining optical fiber consisting of a stress-applying part containing silica glass as a main component, a hole is made in the core base material made of core-clad glass according to the shape of the base material for the stress-applying part, The stress applying part base material is inserted, and then the stress applying part base material and the core base material are heated and integrated under reduced pressure while applying pressure in the axial direction of the stress applying part base material, and simultaneously drawing is performed. The present invention relates to a method for manufacturing a constant polarization optical fiber, which comprises obtaining a constant polarization optical fiber.
以下、実施例に基き、本発明の方法を具体的に説明す
る。本発明方法で製造する定偏波フアイバは第１図に例
示したようなコアを中心として対称の位置に偶数の応力
付与部を有する構造のものである。第２図（イ）及び
（ロ）は本発明の実施態様を例示した説明図である。ま
ず第２図（イ）に示すようにコアガラス１′とクラツド
ガラス２′からなるコア母材11に、コアに対称な位置に
孔4a,4bを超音波開孔器を用いて開孔する。次でコア母
材11の一端に石英棒６を融着し、孔4a,4bの一端を閉
じ、更にコア母材11の逆端に石英管５を隔着する。その
後石英管５を通じて、孔4a,4b内に応力付与部用母材
３′a,3′ｂを挿入し、さらにその上に石英管7a,7bを第
２図（イ）のように挿入する。次に該石英管7a,7bの上
におもり８を置き、応力付与部用母材３′a,3′ｂの軸
方向に圧力が働くようにする。これを第２図（ロ）に示
すように、真空ポンプを用いて孔内を減圧しながら抵抗
炉９を用いてコラプスをしながら同時に線引きして、第
１図の構成の定偏波フアイバを得る。Hereinafter, the method of the present invention will be specifically described based on Examples. The constant polarization fiber manufactured by the method of the present invention has a structure having even stress applying portions at symmetrical positions with respect to the core as shown in FIG. FIGS. 2A and 2B are explanatory views illustrating the embodiment of the present invention. First, as shown in FIG. 2 (a), holes 4a and 4b are formed in a core base material 11 composed of a core glass 1'and a cladding glass 2'at positions symmetrical to the core by using an ultrasonic perforator. Next, the quartz rod 6 is fused to one end of the core base material 11, the ends of the holes 4a and 4b are closed, and the quartz tube 5 is separated from the opposite end of the core base material 11. After that, the stress-applying part base materials 3'a, 3'b are inserted into the holes 4a, 4b through the quartz tube 5, and further the quartz tubes 7a, 7b are inserted thereon as shown in FIG. 2 (a). . Next, the weight 8 is placed on the quartz tubes 7a, 7b so that pressure acts in the axial direction of the base materials 3'a, 3'b for the stress applying portion. As shown in FIG. 2 (b), this is simultaneously drawn while decompressing the inside of the hole by using a vacuum pump and performing a collapse by using a resistance furnace 9 to obtain a constant polarization fiber having the configuration of FIG. obtain.
本発明の方法を用いることにより、第４図に示したよう
な応力付与部用母材のしぼり出しは防がれる。また、本
発明方法によれば、応力付与部用母材に軸方向応力を付
加しながら加熱しているため、応力付与部材のみ、孔内
のすきまに充填され〔第２図（ロ）〕コア母材の変形は
おこらないので、単にしぼり出しを防ぐ場合より、さら
に、コア形状の変形を小さくできる。By using the method of the present invention, squeezing out of the base material for the stress imparting portion as shown in FIG. 4 can be prevented. Further, according to the method of the present invention, since the base material for the stress applying portion is heated while applying the axial stress, only the stress applying member is filled in the clearance in the hole [Fig. 2 (b)] core. Since the deformation of the base material does not occur, the deformation of the core shape can be further reduced as compared with the case of simply preventing the squeezing.
このように、本発明を用いることにより、応力付与部、
及び、コアの変形がほとんどない、優れた偏波特性を有
する定偏波光フアイバを得ることが可能となる。Thus, by using the present invention, the stress applying portion,
In addition, it is possible to obtain a constant polarization optical fiber having excellent polarization characteristics with almost no deformation of the core.
（実施例） VAD法により作製した直径30mm、長さ200mm、コア径1.4m
mのシングルモードフアイバ用プリフオーム（コア母材1
1）に8mmφの孔（4a,4b）を、中心から対称な位置に、
間隔6mmで２つ、超音波加工により設けた。このように
して得られたコア用母材11の孔4a,4b内にSF6を流しなが
ら、コア母材11を酸水素炎で加熱して孔4a,4bの表面を
ガス・エツチングした後、コア用母材11の一端に第２図
（イ）に示したように石英棒６を、また逆端に石英パイ
プ５を融着した。次に孔4a,4b内に、直径8mmφ、長さ17
0mmのB2O3を18重量％添加したガラス棒３′a,3′ｂを挿
入した。該ガラス棒３′a,3′ｂの上には、石英棒7a,7b
を挿入し、更に石英パイプ５内に、600gの真ちゆう製の
おもり８を挿入して石英棒7a,7bの上に置いた。このよ
うにして得られたプリフオーム、第２図（ロ）に示すよ
うに、抵抗炉９を用いて、約2000℃にて線引を行い、外
径125μｍ、全長4000mのフアイバを得た。(Example) Diameter 30 mm, length 200 mm, core diameter 1.4 m manufactured by VAD method
Preform for m single mode fiber (core base material 1
1) with 8mmφ holes (4a, 4b) at symmetrical positions from the center,
Two with 6 mm spacing were provided by ultrasonic machining. While flowing SF 6 in the holes 4a, 4b of the core base material 11 thus obtained, after heating the core base material 11 with an oxyhydrogen flame to gas-etch the surface of the holes 4a, 4b, A quartz rod 6 was fused to one end of the core base material 11 as shown in FIG. 2 (a), and a quartz pipe 5 was fused to the opposite end thereof. Next, in the holes 4a, 4b, diameter 8mmφ, length 17
A glass rod 3'a, 3'b containing 18% by weight of 0 mm B 2 O 3 was inserted. Quartz rods 7a, 7b are placed on the glass rods 3'a, 3'b.
Was further inserted into the quartz pipe 5, and 600 g of a weight 8 made of brass was placed on the quartz rods 7a and 7b. The preform thus obtained, as shown in FIG. 2 (b), was drawn at about 2000 ° C. using a resistance furnace 9 to obtain a fiber having an outer diameter of 125 μm and a total length of 4000 m.
得られたフアイバの断面形状は全長にわたつて殆んど変
化がなく、フアイバの両端において、コア及び応力付与
部の非円率は0.08％以下および0.2％以下であり、良好
な断面形状が得られた。また、偏波特性も良好であり、
ビート長は波長λ＝1.3μｍで2.9mm、クロストークは30
dB/kmであつた。The cross-sectional shape of the fiber obtained did not change over the entire length, and the non-circularity of the core and the stress-applying part was 0.08% or less and 0.2% or less at both ends of the fiber, and a good cross-sectional shape was obtained. Was given. Also, the polarization characteristics are good,
Beat length is 2.9 mm at wavelength λ = 1.3 μm, crosstalk is 30
It was dB / km.
（発明の効果） 本発明の方法は、断面形状の変形が少なく、しかも良好
な偏波保持能力を有する定偏波フアイバを安定して効率
良く製造できる方法である。(Effect of the Invention) The method of the present invention is a method capable of stably and efficiently manufacturing a constant polarization fiber having a small cross-sectional shape deformation and having a good polarization maintaining ability.
第１図は本発明で製造する定偏波フアイバの構造の一例
の断面図、 第２図（イ）及び（ロ）は本発明の実施態様を順次説明
する図、 第３図は従来法の１例を説明する図、 第４図は従来法の別の例を説明する図で、真空にして加
熱一体化と同時に線引きする方法を示す。 第５図はドープ剤添加石英ガラスのドープ剤酸化物濃度
と軟化点温度の関係を示すグラフである。FIG. 1 is a sectional view of an example of the structure of a constant polarization fiber manufactured by the present invention, FIGS. 2 (a) and 2 (b) are views for sequentially explaining the embodiments of the present invention, and FIG. 3 is a view of a conventional method. FIG. 4 is a diagram for explaining one example, and FIG. 4 is a diagram for explaining another example of the conventional method, showing a method of drawing a vacuum and heating and unifying at the same time. FIG. 5 is a graph showing the relationship between the dopant oxide concentration and the softening point temperature of the dopant-added quartz glass.
Claims (1)
ラスから成るクラッドと該コアの両側にコアを中心とし
て対称に配置された２本以上の偶数本の、石英ガラスを
主成分とする応力付与部から成る定偏波光ファイバの作
製において、コア・クラッド−ガラスから成るコア母材
に、応力付与部母材の形状に合わせて穴をあけ、該穴に
前記応力付与部母材を挿入し、次に該応力付与部用母材
の軸方向に圧力を加えながら減圧下で応力付与部用母材
と一体化していないコア母材をコラップスしながら線引
を行い、定偏波光ファイバを得ることを特徴とする定偏
波光ファイバの製造方法。1. A core containing silica glass as a main component, a cladding made of silica glass, and an even number of two or more silica glass which are symmetrically arranged on both sides of the core with the core as the main component. In the production of a constant polarization optical fiber including a stress applying part, a core / clad-glass core preform is drilled in accordance with the shape of the stress applying part preform, and the stress applying part preform is inserted into the hole. Then, while applying pressure in the axial direction of the stress-applying part base material, the core base material that is not integrated with the stress-applying part base material is drawn under reduced pressure to draw a constant polarization optical fiber. A method for manufacturing a polarization-maintaining optical fiber, which comprises:
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP60148269A JPH0776104B2 (en) | 1985-07-08 | 1985-07-08 | Method of manufacturing constant polarization optical fiber |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP60148269A JPH0776104B2 (en) | 1985-07-08 | 1985-07-08 | Method of manufacturing constant polarization optical fiber |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6212626A JPS6212626A (en) | 1987-01-21 |
| JPH0776104B2 true JPH0776104B2 (en) | 1995-08-16 |
Family
ID=15448989
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP60148269A Expired - Fee Related JPH0776104B2 (en) | 1985-07-08 | 1985-07-08 | Method of manufacturing constant polarization optical fiber |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0776104B2 (en) |
Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH064490B2 (en) * | 1987-12-09 | 1994-01-19 | 住友電気工業株式会社 | Method of manufacturing constant polarization optical fiber |
| JPH0421533A (en) * | 1990-05-14 | 1992-01-24 | Fujikura Ltd | Preparation of polarized wave-holding optical fiber |
| US5152818A (en) * | 1990-11-09 | 1992-10-06 | Corning Incorporated | Method of making polarization retaining fiber |
| EP0630864A3 (en) * | 1993-05-24 | 1995-05-24 | Sumitomo Electric Industries | Method of manufacturing an optical fiber with polarization conservation. |
| WO2000042458A1 (en) | 1999-01-18 | 2000-07-20 | Sumitomo Electric Industries, Ltd. | Optical fiber and method of manufacture thereof |
| JP2003212581A (en) * | 2002-01-21 | 2003-07-30 | Sumitomo Electric Ind Ltd | Manufacturing method of polarization maintaining fiber |
| WO2003075058A1 (en) * | 2002-03-04 | 2003-09-12 | Sumitomo Electric Industries, Ltd. | Polarized wave holding optical fiber, and method of producing the same |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS59137330A (en) * | 1983-01-20 | 1984-08-07 | Nippon Telegr & Teleph Corp <Ntt> | Manufacture of optical fiber sustaining polarization |
-
1985
- 1985-07-08 JP JP60148269A patent/JPH0776104B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6212626A (en) | 1987-01-21 |
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| LAPS | Cancellation because of no payment of annual fees |