JPH03170342A - Production of polarization-maintaining optical fiber - Google Patents
Production of polarization-maintaining optical fiberInfo
- Publication number
- JPH03170342A JPH03170342A JP1305962A JP30596289A JPH03170342A JP H03170342 A JPH03170342 A JP H03170342A JP 1305962 A JP1305962 A JP 1305962A JP 30596289 A JP30596289 A JP 30596289A JP H03170342 A JPH03170342 A JP H03170342A
- Authority
- JP
- Japan
- Prior art keywords
- optical fiber
- porous glass
- glass rod
- polarization
- holes
- 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
- 239000013307 optical fiber Substances 0.000 title claims abstract description 24
- 238000004519 manufacturing process Methods 0.000 title claims description 12
- 239000005373 porous glass Substances 0.000 claims abstract description 26
- 238000000034 method Methods 0.000 claims abstract description 19
- 229910044991 metal oxide Inorganic materials 0.000 claims abstract description 9
- 150000004706 metal oxides Chemical class 0.000 claims abstract description 9
- 238000009987 spinning Methods 0.000 claims abstract description 7
- 238000005253 cladding Methods 0.000 claims description 11
- 238000005553 drilling Methods 0.000 claims description 2
- 230000010354 integration Effects 0.000 claims description 2
- 239000011521 glass Substances 0.000 abstract description 11
- 239000000463 material Substances 0.000 abstract description 9
- 229910052751 metal Inorganic materials 0.000 abstract description 8
- 239000002184 metal Substances 0.000 abstract description 8
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 abstract description 6
- 150000004703 alkoxides Chemical class 0.000 abstract description 6
- 239000011159 matrix material Substances 0.000 abstract description 4
- 238000010438 heat treatment Methods 0.000 abstract description 2
- 238000005336 cracking Methods 0.000 abstract 1
- -1 trimethoxyboron) Chemical class 0.000 abstract 1
- WRECIMRULFAWHA-UHFFFAOYSA-N trimethyl borate Chemical compound COB(OC)OC WRECIMRULFAWHA-UHFFFAOYSA-N 0.000 abstract 1
- 230000010287 polarization Effects 0.000 description 5
- 230000015572 biosynthetic process Effects 0.000 description 4
- 239000000243 solution Substances 0.000 description 4
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 2
- 239000000654 additive Substances 0.000 description 2
- 229910052681 coesite Inorganic materials 0.000 description 2
- 229910052906 cristobalite Inorganic materials 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 150000004715 keto acids Chemical class 0.000 description 2
- 239000000377 silicon dioxide Substances 0.000 description 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
- 229910052682 stishovite Inorganic materials 0.000 description 2
- 229910052905 tridymite Inorganic materials 0.000 description 2
- ZOXJGFHDIHLPTG-UHFFFAOYSA-N Boron Chemical compound [B] ZOXJGFHDIHLPTG-UHFFFAOYSA-N 0.000 description 1
- 208000025174 PANDAS Diseases 0.000 description 1
- 208000021155 Paediatric autoimmune neuropsychiatric disorders associated with streptococcal infection Diseases 0.000 description 1
- 240000000220 Panda oleosa Species 0.000 description 1
- 235000016496 Panda oleosa Nutrition 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- 239000007864 aqueous solution Substances 0.000 description 1
- POPCQNRKDVTFGA-UHFFFAOYSA-N boric acid methanol Chemical compound OC.OB(O)O POPCQNRKDVTFGA-UHFFFAOYSA-N 0.000 description 1
- 229910052796 boron Inorganic materials 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 239000002019 doping agent Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000010419 fine particle Substances 0.000 description 1
- 238000007654 immersion Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 239000012071 phase Substances 0.000 description 1
- 238000005191 phase separation Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 230000000284 resting effect Effects 0.000 description 1
- 238000003980 solgel method Methods 0.000 description 1
- 238000001308 synthesis method Methods 0.000 description 1
- 239000012808 vapor phase Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 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)
Abstract
Description
【発明の詳細な説明】
（産業上の利用分野）
本発明は、単一偏波特性を有する光ファイバの製造方法
に関するものである。DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a method of manufacturing an optical fiber having single polarization characteristics.
（従来の技術）
従来、光フ．アイパの製造において、その長手方向に直
角な断面内の直交する２軸方向における領域の屈折率が
互いに異なる場合には、単一偏波特性を有することが知
られている。(Conventional technology) Conventionally, optical fiber. In the production of eyepers, it is known that if the refractive indexes of regions in two orthogonal axial directions in a cross section perpendicular to the longitudinal direction are different from each other, the eyeper has single polarization characteristics.
例えば、いわゆるパンダ型がその１つである。For example, the so-called panda type is one of them.
これは、コア、クラッドを有する光ファイバのクラツド
内の１つの直径上にコアを挟んで熱膨張係数の大きなガ
ラスからなる応力付与部を設けたものである。この種の
光ファイバの一般的な製造方法は、あらかじめコア，ク
ラッドを有する光ファイバ用母材と応力付与部材とを別
々に製造し、コア，クラッド母材の相当部分に孔を開け
、その孔に応力付与部材を挿入後、一体ガラス化してプ
レフォームとし、線引きを行なうものである。応力付与
部材としては、Ｂ２０３−ＳｉＯ２，Ｂ２０３ＧｅＯ２
−ＳｉＯ２ガラス等が用いられ、ＭＣＶＤ法（内付け法
）によるのが一般的である。This is an optical fiber having a core and a cladding, and a stress applying section made of glass having a large coefficient of thermal expansion is provided on one diameter of the cladding, with the core sandwiched therebetween. The general manufacturing method for this type of optical fiber is to separately manufacture an optical fiber base material having a core and cladding and a stress-applying member in advance, and then drill a hole in a considerable portion of the core and cladding base material. After inserting a stress-applying member into the material, the material is integrally vitrified to form a preform, which is then wire-drawn. As stress applying members, B203-SiO2, B203GeO2
-SiO2 glass or the like is used, and the MCVD method (internal attachment method) is generally used.
この方法によれば、応力付与部材の領域の形成の制御が
容易であり、精度のよいものが得られるが、応力付与部
材をガラス化する際にクラックが発生し易く、また、そ
の原料であるＢＣＬの収率が非常に低く、添加材として
の金属酸化物としても蒸気圧の高いものに限られるとい
う問題があった。According to this method, it is easy to control the formation of the region of the stress-applying member and a product with good precision can be obtained, but cracks are likely to occur when the stress-applying member is vitrified, and the raw material is There were problems in that the yield of BCL was very low and the metal oxides used as additives were limited to those with high vapor pressure.
これに対して、特開昭５７−２７２０８号公報に記載さ
れた製造方法は、気相軸付け法で製造されたコア，クラ
ッド構造を有する多孔質ガラスの長手方向の向かい合う
両側面に、液状の金属アルコキサイドを塗布して含浸さ
せた後、水蒸気中で前記多孔質ガラス母材中の金属アル
コキサイドを加水分解して金属酸化物を含む多孔質ガラ
ス領域を形成し、次いで、透明ガラス化し、線引きする
ものである。On the other hand, the manufacturing method described in Japanese Patent Application Laid-open No. 57-27208 uses liquid on both longitudinally opposing sides of porous glass having a core and clad structure manufactured by the vapor phase axial mounting method. After applying and impregnating the metal alkoxide, the metal alkoxide in the porous glass matrix is hydrolyzed in water vapor to form a porous glass region containing the metal oxide, and then transparent vitrified and wire-drawn. It is something.
この方法は、上述したクラックの発生は防止できるもの
の、応力付与部となるべきガラス領域の形成が、金属ア
ルコキサイドの拡散によるものであり、その領域形成の
制御は非常に困難であり、特性の良好なものを得ること
は困難で、再現性にも乏しいという問題点がある。Although this method can prevent the above-mentioned cracks from occurring, the formation of the glass region that should serve as the stress-applying portion is due to the diffusion of metal alkoxide, and it is extremely difficult to control the formation of that region, resulting in good characteristics. There are problems in that it is difficult to obtain and reproducibility is poor.
（発明が解決しようとする課題）
本発明は、上述した問題点を解決するためになされたも
ので、応力付与部材のガラス化の際のクラックの発生を
防止し、しかも、応力付与部の領域の形成の制御が容易
である、偏波面保持光ファイバの製造方法を提供するも
のである。(Problems to be Solved by the Invention) The present invention has been made to solve the above-mentioned problems. The present invention provides a method for manufacturing a polarization-maintaining optical fiber in which the formation of the polarization-maintaining optical fiber can be easily controlled.
（課題を解決するための手段）
本発明は、コア，クラッドおよび応力付与部材からなる
偏波保持光ファイバの製造方法において、コア，クラッ
ドからなるガラス母材のクラッドのコアを取り巻く少な
くとも２個所に孔を開け、金属酸化物を含む多孔質ガラ
スロッドを前記孔に挿入した後、一体化に引続き紡糸、
または、一休化と同時に紡糸することを特徴とするもの
である。(Means for Solving the Problems) The present invention provides a method for manufacturing a polarization-maintaining optical fiber comprising a core, a cladding, and a stress applying member. After drilling a hole and inserting a porous glass rod containing metal oxide into the hole, following the integration, spinning,
Alternatively, it is characterized by spinning at the same time as resting.
前記多孔質ガラスロッドは、分相法、気相合成法、ゾル
ゲル法等により得ることができる。The porous glass rod can be obtained by a phase separation method, a gas phase synthesis method, a sol-gel method, or the like.
前記多孔質ガラスロッドに金属酸化物を含有させる方法
として、多孔質ガラスロッドを金属アルコキシド、もし
くは、そのアルコール溶液に浸漬させた後、加水分解、
脱アルコール処理を行なう方法を採用してもよい。As a method for containing metal oxides in the porous glass rod, the porous glass rod is immersed in a metal alkoxide or its alcohol solution, and then hydrolyzed.
A method of performing a dealcoholization treatment may also be adopted.
また、前記多孔質ガラスロッドに金属酸化物を含有させ
る方法として、多孔質ガラスロッドを金属オキソ酸の水
溶液、または、アルコール溶液に３−
浸漬させた後、加熱、分解処理を行なう方法を採用する
こともできる。Further, as a method for incorporating the metal oxide into the porous glass rod, a method is adopted in which the porous glass rod is immersed in an aqueous solution of a metal oxoacid or an alcohol solution, and then heated and decomposed. You can also do that.
（作 用）
本発明は、コア，クラッドおよび応力付与部材からなる
偏波保持光ファイバの製造方法において、コア，クラッ
ドからなるガラス母材のクラッドのコアを取り巻く少な
くとも２個所に孔を開け、金属酸化物を含む多孔質ガラ
スロッドを前記孔に挿入した後、ガラス化することによ
り、応力付与部の領域を正確に位置決めでき、応力付与
部材が紡糸直前までガラス化されないため、応力の存在
によるクラックの発生が防止できるものである。(Function) The present invention provides a method for manufacturing a polarization-maintaining optical fiber consisting of a core, a cladding, and a stress applying member, in which holes are formed in at least two places surrounding the core of the cladding of a glass base material consisting of the core and the cladding. By inserting a porous glass rod containing an oxide into the hole and then vitrifying it, the area of the stress-applying part can be precisely positioned, and since the stress-applying member is not vitrified until immediately before spinning, cracks due to the presence of stress can be avoided. It is possible to prevent the occurrence of
（実施例）
実施例１
第１図，第２図は、本発明の一実施例を説明するための
光ファイバ母材に多孔質ガラスロッドを挿入した状態を
示すもので、第１図は、軸方向の断面図、第２図は、径
方向の断面図である。図中、１はコア部、２はクラッド
部、３は孔、４は多孔質ガラスロッドである。(Example) Example 1 Figures 1 and 2 show a state in which a porous glass rod is inserted into an optical fiber base material for explaining an example of the present invention. The axial cross-sectional view, FIG. 2, is a radial cross-sectional view. In the figure, 1 is a core part, 2 is a clad part, 3 is a hole, and 4 is a porous glass rod.
ＶＡＤ法（垂直軸付け法）により直径２０ｍｍのＳｉＯ
２ガラス微粒子堆積体を形成した。このガラス微粒子堆
積体を１ ４ ５ ０℃で３０分間熱処理を行い、
直径７．８ｍｍ，嵩密度１．５ｇ／ｃｍ３の多孔質ガラ
スロッドを得た。次いで、この多孔質ガラスロッドを、
ほう酸２３重量％メタノール溶液に浸漬させた後、ｉｏ
ｏ’ｃで加熱処理を行ない、脱アルコール、分解を行な
った。この段階における多孔質ガラス中のＢ ２ ０
ａ濃度は、１５重量％であった。SiO with a diameter of 20 mm was created using the VAD method (vertical axis method).
2 glass fine particle deposits were formed. This glass particle deposit was heat-treated at 1450° C. for 30 minutes to obtain a porous glass rod with a diameter of 7.8 mm and a bulk density of 1.5 g/cm 3 . Next, this porous glass rod is
After immersion in a 23% by weight boric acid methanol solution, io
Heat treatment was performed at o'c to perform dealcoholization and decomposition. B20 in the porous glass at this stage
The a concentration was 15% by weight.
次に、ＶＡＤ法により得られた直径３０ｍｍの光ファイ
バ用ガラス母材のコア部１の両側のクラッド部２に直径
８ｍｍの孔３を開けた後、この孔に前記多孔質ガラスロ
ッド４を挿入固定した。次いで、孔の内部を減圧しなが
ら２１００’Ｃに加熱し、多孔質ガラスロッド部を透明
ガラス化して光ファイバ母材のクラッドに一体化を行な
うと同時に直径１２５μｍに紡糸した。Next, a hole 3 with a diameter of 8 mm is made in the cladding part 2 on both sides of the core part 1 of the glass preform for an optical fiber with a diameter of 30 mm obtained by the VAD method, and the porous glass rod 4 is inserted into this hole. Fixed. Next, the inside of the hole was heated to 2100'C while reducing the pressure to make the porous glass rod part transparent vitrified and integrated into the cladding of the optical fiber preform, and at the same time, it was spun to a diameter of 125 μm.
得られた光ファイバ５ｍを直径２０ｍｍのボビンに巻き
付けて、クロストークの測定を行なったところ、−４０
ｄＢであり、非常に良好な偏波保持特性を示した。When 5 m of the obtained optical fiber was wound around a bobbin with a diameter of 20 mm and the crosstalk was measured, it was found to be -40
dB, showing very good polarization maintaining characteristics.
実施例２
多孔質パイコールガラス（米、コーニング社、＃７９３
０）の直径７．８ｍｍのロツドを用い、これをＢ（○Ｃ
Ｈ３）ａメタノール溶液に浸積させた後、加水分解させ
、その後、１００’Ｃで乾燥、脱アルコール処理を行な
い、Ｂ２０３含有の多孔質ガラスロツドを得た。この多
孔質ガラスロツドを用い、前記実施例１と同様にして光
ファイバを製造した。偏波保持特性は実施例１と同様、
良好であった。Example 2 Porous Pycor glass (Corning, USA, #793
Use a rod with a diameter of 7.8 mm from 0) and attach it to B(○C
H3)a After being immersed in a methanol solution, it was hydrolyzed, then dried at 100'C and dealcoholized to obtain a porous glass rod containing B203. Using this porous glass rod, an optical fiber was manufactured in the same manner as in Example 1 above. The polarization maintaining characteristics are the same as in Example 1.
It was good.
なお、これら実施例において、添加金属としてほう素を
用いたが、オキソ酸、あるいは、アルコキシドを形成す
る他の金属を用いることができる。Although boron was used as the additive metal in these Examples, oxoacid or other metals that form alkoxides may be used.
（発明の効果）
以上の説明から明らかなように、本発明によれば、偏波
保持光ファイバの製造方法において、応力付与部の領域
を正確に位置決めでき、クラツクの発生が防止できるか
ら、歩留まりの低下を防ぎ、低コストで高性能な偏波保
持光ファイバを得ることができる。また、応力付与部材
として種々のドーパントを利用することができる効果が
ある。(Effects of the Invention) As is clear from the above description, according to the present invention, in the manufacturing method of polarization maintaining optical fiber, the region of the stress applying part can be accurately positioned and the occurrence of cracks can be prevented, resulting in a reduction in yield. Therefore, it is possible to obtain a high-performance polarization-maintaining optical fiber at low cost. Further, there is an advantage that various dopants can be used as stress applying members.
第１図，第２図は、本発明の一実施例を説明するための
の光ファイバ母材の説明図で、第１図は、軸方向の断面
図、第２図は、径方向の断面図である。
１・・・コア部、２・・・クラッド部、３・・・孔、４
・・・多孔質ガラスロッド。1 and 2 are explanatory diagrams of an optical fiber preform for explaining one embodiment of the present invention. FIG. 1 is an axial cross-sectional view, and FIG. 2 is a radial cross-sectional view. It is a diagram. 1... Core part, 2... Clad part, 3... Hole, 4
...Porous glass rod.
Claims (1)
光ファイバの製造方法において、コア、クラッドからな
るガラス母材のクラッドのコアを取り巻く少なくとも２
個所に孔を開け、金属酸化物を含む多孔質ガラスロッド
を前記孔に挿入した後、一体化に引続き紡糸、または、
一体化と同時に紡糸することを特徴とする偏波保持光フ
ァイバの製造方法。In a method for manufacturing a polarization-maintaining optical fiber comprising a core, a cladding, and a stress applying member, at least two
After drilling a hole at a location and inserting a porous glass rod containing a metal oxide into the hole, following the integration, spinning or
A method for manufacturing a polarization-maintaining optical fiber, characterized by integrating and spinning simultaneously.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1305962A JPH03170342A (en) | 1989-11-25 | 1989-11-25 | Production of polarization-maintaining optical fiber |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1305962A JPH03170342A (en) | 1989-11-25 | 1989-11-25 | Production of polarization-maintaining optical fiber |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH03170342A true JPH03170342A (en) | 1991-07-23 |
Family
ID=17951396
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1305962A Pending JPH03170342A (en) | 1989-11-25 | 1989-11-25 | Production of polarization-maintaining optical fiber |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH03170342A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100782475B1 (en) * | 2005-12-05 | 2007-12-05 | 주식회사 옵토매직 | The Method of Optical Fiber and Optical Fiber thereof |
-
1989
- 1989-11-25 JP JP1305962A patent/JPH03170342A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100782475B1 (en) * | 2005-12-05 | 2007-12-05 | 주식회사 옵토매직 | The Method of Optical Fiber and Optical Fiber thereof |
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