JPS6365615B2 - - Google Patents
Info
- Publication number
- JPS6365615B2 JPS6365615B2 JP59041050A JP4105084A JPS6365615B2 JP S6365615 B2 JPS6365615 B2 JP S6365615B2 JP 59041050 A JP59041050 A JP 59041050A JP 4105084 A JP4105084 A JP 4105084A JP S6365615 B2 JPS6365615 B2 JP S6365615B2
- Authority
- JP
- Japan
- Prior art keywords
- core
- glass rod
- fiber
- glass
- stress
- 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
Links
- 239000011521 glass Substances 0.000 claims description 41
- 238000000034 method Methods 0.000 claims description 22
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 14
- 238000004519 manufacturing process Methods 0.000 claims description 10
- 239000010453 quartz Substances 0.000 claims description 8
- 239000013307 optical fiber Substances 0.000 claims description 5
- 230000002093 peripheral effect Effects 0.000 claims description 3
- 239000000835 fiber Substances 0.000 description 27
- 230000010287 polarization Effects 0.000 description 23
- 239000002131 composite material Substances 0.000 description 4
- 239000002019 doping agent Substances 0.000 description 3
- 238000010438 heat treatment Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 238000009987 spinning Methods 0.000 description 3
- KRHYYFGTRYWZRS-UHFFFAOYSA-N Fluorane Chemical compound F KRHYYFGTRYWZRS-UHFFFAOYSA-N 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 1
- 238000005229 chemical vapour deposition Methods 0.000 description 1
- 230000001427 coherent effect Effects 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 238000000151 deposition Methods 0.000 description 1
- 238000005530 etching Methods 0.000 description 1
- 238000007524 flame polishing Methods 0.000 description 1
- 239000005357 flat glass Substances 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
- 230000008023 solidification Effects 0.000 description 1
- 239000004071 soot Substances 0.000 description 1
- 238000007740 vapor deposition Methods 0.000 description 1
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
- 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
- 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)
- Manufacture, Treatment Of Glass Fibers (AREA)
Description
【発明の詳細な説明】
（技術分野）
本発明は偏波特性を有する定偏波フアイバの製
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 for manufacturing a polarization constant fiber having polarization characteristics.
（背景技術）
光の偏波状態を保持する定偏波フアイバは、例
えば光フアイバセンサー、コヒーレント通信等へ
の応用が可能なことから、その開発が望まれてい
る。この定偏波フアイバは、光を伝播するコアに
複屈折性を付加して、偏光状態を保持することを
可能にしたもので、従来、第１図に例示するよう
な非軸対称屈折率フアイバが提案されている。図
において、定偏波フアイバ１は、屈折率の高いコ
ア２の外周にそれより屈折率の低いジヤケツト４
がかぶせられ、かつジヤケツト４内にはコア２に
対して軸対称に応力付加部３が形成されたもので
ある。この応力付加部３からコア２に異方性応力
が付加され、コア２は複屈折率を有するようにな
る。(Background Art) The development of a constant polarization fiber that maintains the polarization state of light is desired because it can be applied to, for example, optical fiber sensors and coherent communications. This polarization constant fiber is made by adding birefringence to the core through which light propagates, making it possible to maintain the polarization state. is proposed. In the figure, a constant polarization fiber 1 has a core 2 with a high refractive index and a jacket 4 with a lower refractive index around the outer periphery of the core 2.
A stress applying portion 3 is formed in the jacket 4 in an axially symmetrical manner with respect to the core 2. Anisotropic stress is applied to the core 2 from the stress applying portion 3, and the core 2 comes to have a birefringence.
このような定偏波フアイバを製造する方法とし
て、従来第２図および第３図に例示するような方
法が採られていた。第２図に示す方法は、先ず左
図に示すように、コア５を有する円柱状ガラスロ
ツド６の両側外周面を研削して板状ガラス７を作
り、右図に示すようにこれの両側に夫々応力付加
用ガラスロツド８を配列し、石英（ガラス）管９
に挿入した後、これらを加熱して中実化し、紡糸
することにより光フアイバを製造する。 As a method for manufacturing such a constant polarization fiber, a method as illustrated in FIGS. 2 and 3 has conventionally been adopted. As shown in the left figure, the method shown in FIG. Stress applying glass rods 8 are arranged, and quartz (glass) tube 9 is
After inserting the fiber into the fiber, the fiber is heated to solidify it and then spun to produce an optical fiber.
第３図に示す方法は、コア１０を有するガラス
ロツド１１の周りに石英ガラスロツド１２および
応力付加用ガラスロツド１３を配列し、これらを
石英（ガラス）管１４に挿入した後、これらを加
熱して中実化し、紡糸することにより光フアイバ
を製造する。 The method shown in FIG. 3 involves arranging silica glass rods 12 and stress-applying glass rods 13 around a glass rod 11 having a core 10, inserting them into a quartz (glass) tube 14, and then heating them to form a solid. Optical fibers are manufactured by converting the fibers into fibers and spinning them.
しかし第２図に示す方法では、応力付加用ガラ
スロツド８部が真円から変形するため、左右対称
性が保持されず、定偏波特性を劣化させるのみな
らず、変形度に再現性がないという欠点があつ
た。又第３図に示す方法では、応力付加用ガラス
ロツド１３部又コア１０部が変形してしまうこ
と、および中実化が均一にできず、母材長手方向
の変形の均一性、変形の再現性において劣ること
等の欠点があつた。 However, in the method shown in Figure 2, since the stress applying glass rod 8 is deformed from a perfect circle, the left-right symmetry is not maintained, which not only deteriorates the constant polarization characteristic but also lacks reproducibility in the degree of deformation. There was a drawback. In addition, in the method shown in Fig. 3, the 13 parts of the glass rod for stress application and the 10 parts of the core are deformed, and solidification cannot be uniformly performed, and the uniformity of deformation in the longitudinal direction of the base material and the reproducibility of deformation are not guaranteed. There were drawbacks such as being inferior in quality.
（発明の開示）
本発明は、上述の欠点を解消するため成された
もので、応力付加部の形状および位置を任意かつ
再現性良く形成し、偏波特性の優れた定偏波フア
イバを再現性良く製造する方法を提供せんとする
ものである。(Disclosure of the Invention) The present invention has been made to solve the above-mentioned drawbacks, and it is possible to form a constant polarization fiber with excellent polarization characteristics by forming the shape and position of the stress applying part arbitrarily and with good reproducibility. The purpose is to provide a manufacturing method with good reproducibility.
本発明は、中心にコアとなる周囲よりも屈折率
の高い部分を有するコアガラスロツドの外周面
に、軸対称に相対向する軸方向の溝を設けた後、
該溝に夫々応力付加用ガラスロツドを挿入し、さ
らに前記コアガラスロツドの外周に石英管を外嵌
し、これらを加熱一体化した後、紡糸することを
特徴とするコアの両側に応力付加部を有する定偏
波光フアイバの製造方法である。 In the present invention, after providing axial grooves facing each other axially symmetrically on the outer circumferential surface of a core glass rod having a portion in the center having a higher refractive index than the surrounding area serving as the core,
A constant material having stress applying parts on both sides of the core is characterized in that stress applying glass rods are inserted into the respective grooves, a quartz tube is further fitted around the outer periphery of the core glass rod, and after these are heated and integrated, spinning is carried out. This is a method for manufacturing polarized optical fiber.
以下、本発明を図面を用いて実施例により説明
する。第４図イ，ロ，ハは本発明方法の実施例を
工程順に説明する断面図である。本発明方法で
は、イ図に示すように、屈折率の高いガラスより
成るコア１５の周りにそれより屈折率の低いガラ
ス部分１６を持つコアガラスロツド１７の両側の
外周面に、軸対称に相対する一対の軸方向の溝１
８を溝切り加工により設ける。この溝１８は、応
力付加用ガラスロツド１９を挿入するためのもの
で、このガラスロツド１９を隙間少なく収容し得
る形状、寸法のものであれば良く、第４図イのよ
うな半径Ｒの円弧状の底を有する溝１８に限定さ
れるものではなく、それ以外の、例えば第５図に
示すような矩形状の溝１８′であつても良い。第
５図において溝１８′は幅ａ、深さｂを有する。
これらの溝の形状、寸法は製造する定偏波フアイ
バの応力付加部の形状寸法に合せて設計されるべ
きものである。 Hereinafter, the present invention will be explained by examples using the drawings. FIGS. 4A, 4B, and 4C are cross-sectional views illustrating an embodiment of the method of the present invention in the order of steps. In the method of the present invention, as shown in FIG. axial groove 1
8 is provided by groove cutting. This groove 18 is for inserting the glass rod 19 for applying stress, and may have a shape and size that can accommodate the glass rod 19 with a small gap. The groove 18 is not limited to having a bottom, but may be a groove 18' having a rectangular shape as shown in FIG. 5, for example. In FIG. 5, groove 18' has a width a and a depth b.
The shape and dimensions of these grooves should be designed in accordance with the shape and dimensions of the stress applying portion of the polarization constant fiber to be manufactured.
溝切り加工後の溝表面は、フアイバの伝送損
失、フアイバの引張強度を考慮すると、弗酸エツ
チング、火炎研摩等により研摩することが望まし
い。 The groove surface after grooving is desirably polished by hydrofluoric acid etching, flame polishing, etc. in consideration of fiber transmission loss and fiber tensile strength.
次に、ロ図に示すように溝を設けたコアガラス
ロツド１７の溝１８内に夫々応力付加用ガラスロ
ツド１９を挿入し、これらの外周に石英（ガラ
ス）管２０を外嵌してかぶせる。 Next, as shown in FIG. 3, stress applying glass rods 19 are respectively inserted into the grooves 18 of the core glass rod 17 provided with grooves, and a quartz (glass) tube 20 is fitted and covered around the outer circumferences of these rods.
しかる後、ロ図に示す複合材を外部から加熱す
ることにより一体化する。この場合、一体化を容
易にするため、石英管２０内部を減圧状態にして
おくことが好ましい。 Thereafter, the composite material shown in Figure 4 is heated from the outside to integrate it. In this case, in order to facilitate integration, it is preferable to keep the inside of the quartz tube 20 in a reduced pressure state.
引続き抵抗加熱炉により加熱しながら線引き
（紡糸）すると、ハ図に示すようにコア２２の両
側に応力付加部２３，２３が形成された定偏波フ
アイバ２１を製造することができる。 By subsequently drawing (spinning) the fiber while heating it in a resistance heating furnace, it is possible to manufacture a constant polarization fiber 21 in which stress applying portions 23, 23 are formed on both sides of the core 22, as shown in FIG.
なお、コアガラスロツド１７は、内付け化学蒸
着法（MCVD法）、気相軸付け法（VAD法）、プ
ラズマ炎法、外煤付け法等により作成されるもの
で、コア１５に石英ガラスよりも屈折率が高くな
るドーパントを添加するか、又はその周辺のガラ
ス部分１６に石英ガラスよりも屈折率が低くなる
ドーパントを添加することにより、コア１５と周
辺のガラス部分１６の間に屈折率差を形成したも
のである。 The core glass rod 17 is made by an internal chemical vapor deposition method (MCVD method), a vapor deposition method (VAD method), a plasma flame method, an external soot deposition method, etc. A refractive index difference is created between the core 15 and the surrounding glass portion 16 by adding a dopant that increases the refractive index, or by adding a dopant that makes the refractive index lower than that of quartz glass to the surrounding glass portion 16. This is what I did.
又応力付加用ガラスロツド１９も上述のコアガ
ラスロツド１７の製造方法と同様の方法により作
成されるものであり、ドーパントを添加して、そ
の熱膨脹係数を石英ガラスのそれよりも大きくし
たものである。 The stress-applying glass rod 19 is also manufactured by the same method as the above-mentioned core glass rod 17, and a dopant is added thereto to make its coefficient of thermal expansion larger than that of quartz glass.
このような本発明による製造方法によれば、素
材を組み合せた複合材の内部における隙間を少な
くし得るので、コアガラスロツドの両側の外周面
に設ける溝および応力付加用ガラスロツドの形
状、寸法を任意に設計することにより、応力付加
部２３の形状、寸法を最適に再現性良く製造する
ことができ、偏波特性の優れた定偏波フアイバを
製造することができる。 According to the manufacturing method according to the present invention, the gap inside the composite material made by combining materials can be reduced, so the shape and dimensions of the grooves provided on the outer peripheral surface on both sides of the core glass rod and the glass rod for applying stress can be arbitrarily designed. By doing so, the shape and dimensions of the stress applying portion 23 can be manufactured with optimum reproducibility, and a constant polarization fiber with excellent polarization characteristics can be manufactured.
（実施例）
第４図に示した本発明方法により定偏波フアイ
バを製造した。(Example) A constant polarization fiber was manufactured by the method of the present invention shown in FIG.
先ずイ図に示すようなコアガラスロツド１７と
して、VAD法により直径3.5mmのコア１５を有す
る外径21mmの石英ガラスロツドを作成した。この
ガラスロツドの両側面に半径Ｒ＝10mmの円弧状の
底を有する深さ６mmの溝１８，１８を溝切り加工
した。 First, as a core glass rod 17 as shown in Fig. A, a quartz glass rod having an outer diameter of 21 mm and having a core 15 of 3.5 mm in diameter was prepared by the VAD method. Grooves 18, 18 with a depth of 6 mm and having arcuate bottoms with a radius R of 10 mm were cut on both sides of this glass rod.
この溝１８，１８に、B2O3をドープレ、熱膨
脹係数を大きくした８mmφの応力付加用ガラスロ
ツド１９，１９を挿入し、それらの外側に外径46
mm、内径26mmの石英ガラス管２０をかぶせた後、
加熱して中実化し、定偏波フアイバプリフオーム
５本を作成した。 Into these grooves 18, 18, stress applying glass rods 19, 19 doped with B 2 O 3 and having a large coefficient of thermal expansion and having an outer diameter of 46 mm are inserted.
After covering the quartz glass tube 20 with an inner diameter of 26 mm,
It was heated and solidified to produce five constant polarization fiber preforms.
これらを線引きし、直径125μｍの定偏波フア
イバを製造した。 These were drawn to produce a constant polarization fiber with a diameter of 125 μm.
得られたフアイバについて、波長λ＝1.15μｍ
の光でビート長LBを測定したところ、平均値5.3
mm、標準偏差0.4mmで、非常にばらつきが小さく、
再現性の良いものであつた。 For the obtained fiber, wavelength λ = 1.15 μm
When the beat length L B was measured with the light of , the average value was 5.3
mm, standard deviation 0.4mm, very small variation.
It had good reproducibility.
（発明の効果）
上述のように構成された本発明の定偏波フアイ
バの製造方法は次のような効果がある。(Effects of the Invention) The method for manufacturing a constant polarization fiber of the present invention configured as described above has the following effects.
(イ) 中心にコアとなる部分を有するコアガラスロ
ツドの外周面に、軸対称に相対する軸方向の溝
を設けた後、該溝に夫々応力付加用ガラスロツ
ドを挿入し、さらに前記コアガラスロツドの外
周に石英管を外嵌して素材となる複合材を作成
するため、複合材内部の隙間を少なくし得、こ
れらを加熱一体化した後、紡糸するから、加工
によるコアおよび応力付加用ガラスの変形が、
再現性良く起こり、応力付加用ガラスが左右対
称に配置されたフアイバが得られるので、偏波
特性の優れた均一な定偏波フアイバを再現性良
く、製造し得る。(b) After providing axially symmetrically opposing axial grooves on the outer circumferential surface of the core glass rod, which has a core portion in the center, stress applying glass rods are inserted into the respective grooves, and quartz is then added to the outer circumference of the core glass rod. Since the composite material is made by fitting the tube onto the outside, the gaps inside the composite material can be reduced, and since they are heated and integrated and then spun, the deformation of the core and stress-applying glass due to processing is minimized.
Since this occurs with good reproducibility and a fiber in which the stress applying glasses are arranged symmetrically can be obtained, a uniform polarization-constant fiber with excellent polarization characteristics can be manufactured with good reproducibility.
(ロ) コアガラスロツドの外周面の両側に設ける溝
および応力付加用ガラスロツドの形状、寸法を
任意に設計することにより、応力付加部の形
状、寸法の最適な定偏波フアイバを任意に再現
性良く製造し得る。(b) By arbitrarily designing the shape and dimensions of the grooves provided on both sides of the outer peripheral surface of the core glass rod and the stress-applying glass rod, it is possible to manufacture a constant polarization fiber with the optimal shape and dimensions of the stress-applying part with high reproducibility. It is possible.
第１図は定偏波フアイバの例を示す断面図であ
る。第２図および第３図はそれぞれ従来の製造方
法の例を説明するための断面図である。第４図
イ，ロ，ハは本発明方法の実施例を工程順に説明
する断面図である。第５図は本発明方法の他の実
施例におけるコアガラスロツドの形状を示す断面
図である。
１，２１……定偏波フアイバ、２，５，１０，
１５，２２……コア、３，２３……応力付加部、
４……ジヤケツト、６……円柱状ガラスロツド、
７……板状ガラス、８，１３，１９……応力付加
用ガラスロツド、９，１４，２０……石英管、１
１……ガラスロツド、１２……石英ガラスロツ
ド、１６……屈折率の低いガラス部分、１７……
コアガラスロツド、１８，１８′……溝、ａ……
幅、ｂ……深さ。
FIG. 1 is a sectional view showing an example of a constant polarization fiber. FIGS. 2 and 3 are cross-sectional views for explaining examples of conventional manufacturing methods, respectively. FIGS. 4A, 4B, and 4C are cross-sectional views illustrating an embodiment of the method of the present invention in the order of steps. FIG. 5 is a sectional view showing the shape of a core glass rod in another embodiment of the method of the present invention. 1, 21... Constant polarization fiber, 2, 5, 10,
15, 22... Core, 3, 23... Stress applying part,
4... Jacket, 6... Cylindrical glass rod,
7... Plate glass, 8, 13, 19... Glass rod for stress application, 9, 14, 20... Quartz tube, 1
1... Glass rod, 12... Quartz glass rod, 16... Glass portion with low refractive index, 17...
Core glass rod, 18, 18'...Groove, a...
Width, b...depth.
Claims (1)
分を有するコアガラスロツドの外周面に、軸対称
に相対向する軸方向の溝を設けた後、該溝に夫々
応力付加用ガラスロツドを挿入し、さらに前記コ
アガラスロツドの外周に石英管を外嵌し、これら
を加熱一体化した後、紡糸することを特徴とする
コアの両側に応力付加部を有する定偏波光フアイ
バの製造方法。1. After providing axial grooves facing each other in an axially symmetrical manner on the outer peripheral surface of the core glass rod, which has a portion at the center with a higher refractive index than the surrounding area that forms the core, stress applying glass rods are inserted into each of the grooves, and A method for manufacturing a polarization-constant optical fiber having stress applying parts on both sides of the core, characterized in that a quartz tube is fitted around the outer periphery of the core glass rod, the two are heated and integrated, and then spun.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP59041050A JPS60186432A (en) | 1984-03-02 | 1984-03-02 | Manufacture of polarization-maintaining fiber |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP59041050A JPS60186432A (en) | 1984-03-02 | 1984-03-02 | Manufacture of polarization-maintaining fiber |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS60186432A JPS60186432A (en) | 1985-09-21 |
| JPS6365615B2 true JPS6365615B2 (en) | 1988-12-16 |
Family
ID=12597574
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP59041050A Granted JPS60186432A (en) | 1984-03-02 | 1984-03-02 | Manufacture of polarization-maintaining fiber |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS60186432A (en) |
Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1989011109A1 (en) * | 1988-05-03 | 1989-11-16 | The University Of Sydney | Circularly birefringent optical fibre |
| EP0372450B1 (en) * | 1988-12-09 | 1994-01-12 | Alcatel N.V. | Process for working up a preform for a polarization-maintaining optical fibre |
| FR2655326B1 (en) * | 1989-12-01 | 1992-02-21 | Thomson Csf | METHOD FOR PRODUCING A HOLLOW OPTICAL FIBER AND DEVICE FOR PRODUCING A HOLLOW OPTICAL FIBER. |
| US5152818A (en) * | 1990-11-09 | 1992-10-06 | Corning Incorporated | Method of making polarization retaining fiber |
| US8434330B2 (en) * | 2009-10-22 | 2013-05-07 | Ofs Fitel, Llc | Techniques for manufacturing birefringent optical fiber |
| FR2952726B1 (en) * | 2009-11-16 | 2012-05-25 | Ixfiber | METHOD FOR MANUFACTURING A FIBER PREFER AND OPTICAL FIBER HAVING POLARIZATION OR POLARIZATION OBTAINED BY FIBRAGGING THE PREFORM |
| CN102351415A (en) * | 2011-06-22 | 2012-02-15 | 武汉烽火锐光科技有限公司 | Manufacture method for polarization maintaining fiber and polarization maintaining fiber |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS58110439A (en) * | 1981-12-22 | 1983-07-01 | Hitachi Cable Ltd | Manufacture of constant polarization type optical fiber |
-
1984
- 1984-03-02 JP JP59041050A patent/JPS60186432A/en active Granted
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS58110439A (en) * | 1981-12-22 | 1983-07-01 | Hitachi Cable Ltd | Manufacture of constant polarization type optical fiber |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS60186432A (en) | 1985-09-21 |
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