JPS63303823A - Production of polarization plane maintaining optical fiber - Google Patents
Production of polarization plane maintaining optical fiberInfo
- Publication number
- JPS63303823A JPS63303823A JP62136450A JP13645087A JPS63303823A JP S63303823 A JPS63303823 A JP S63303823A JP 62136450 A JP62136450 A JP 62136450A JP 13645087 A JP13645087 A JP 13645087A JP S63303823 A JPS63303823 A JP S63303823A
- Authority
- JP
- Japan
- Prior art keywords
- core rod
- core
- optical fiber
- maintaining optical
- outer periphery
- 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 14
- 238000004519 manufacturing process Methods 0.000 title claims description 11
- 230000010287 polarization Effects 0.000 title abstract description 6
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims abstract description 20
- 239000000835 fiber Substances 0.000 claims abstract description 12
- 238000000034 method Methods 0.000 claims abstract description 12
- 239000000377 silicon dioxide Substances 0.000 claims abstract description 9
- 239000011521 glass Substances 0.000 claims abstract description 7
- 238000005245 sintering Methods 0.000 claims abstract description 6
- 238000005253 cladding Methods 0.000 claims description 8
- 239000010419 fine particle Substances 0.000 claims description 3
- 239000000463 material Substances 0.000 abstract description 6
- 230000005540 biological transmission Effects 0.000 abstract description 4
- 239000002245 particle Substances 0.000 abstract description 3
- 238000000151 deposition Methods 0.000 abstract 2
- 230000008021 deposition Effects 0.000 abstract 1
- 230000008033 biological extinction Effects 0.000 description 5
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 239000010453 quartz Substances 0.000 description 2
- 230000001427 coherent effect Effects 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000003287 optical effect Effects 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
- C03B37/014—Manufacture of preforms for drawing fibres or filaments made entirely or partially by chemical means, e.g. vapour phase deposition of bulk porous glass either by outside vapour deposition [OVD], or by outside vapour phase oxidation [OVPO] or by vapour axial deposition [VAD]
-
- 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
- C03B2201/00—Type of glass produced
- C03B2201/06—Doped silica-based glasses
- C03B2201/08—Doped silica-based glasses doped with boron or fluorine or other refractive index decreasing dopant
- C03B2201/10—Doped silica-based glasses doped with boron or fluorine or other refractive index decreasing dopant doped with boron
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B2201/00—Type of glass produced
- C03B2201/06—Doped silica-based glasses
- C03B2201/20—Doped silica-based glasses doped with non-metals other than boron or fluorine
- C03B2201/28—Doped silica-based glasses doped with non-metals other than boron or fluorine doped with phosphorus
-
- 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
Abstract
Description
【発明の詳細な説明】
［産業上の利用分野］
本発明は偏波面保存光ファイバの製造方法に係り、特に
伝送特性の優れたファイバを歩留りよく製造することが
できる方法に関する。DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a method for manufacturing a polarization-maintaining optical fiber, and particularly to a method for manufacturing a fiber with excellent transmission characteristics at a high yield.
［従来の技術〕
従来、楕円ジャケット型の偏波面保存光ファイバは次に
■〜■の工程に従って製造されていた。[Prior Art] Conventionally, an elliptical jacket type polarization maintaining optical fiber has been manufactured according to the following steps (1) to (2).
■ Ｇｅドープ５ｉ０２のコアとシリカクラッドとから
なるコアロッドを直径１ａｌｌ程度に延伸する。(2) A core rod consisting of a Ge-doped 5i02 core and a silica cladding is stretched to a diameter of about 1all.
■ サポート管となる直径１６ｍ、肉厚１．５．Ｆ１度
の出発石英管内壁にＭＣＶＤ法によりＢ及びＰを堆積さ
せる。この堆積層が楕円ジャケット部となる。■ Support pipe with a diameter of 16 m and a wall thickness of 1.5 m. B and P are deposited on the inner wall of the starting quartz tube at F1 degree by the MCVD method. This deposited layer becomes the elliptical jacket part.
■ このサポート管を減圧・加熱することにより楕円化
した後、管内に■で延伸されたコアロッドをロッドイン
し、カラブス及び真円化してファイバ母材とする。■ After making this support tube into an oval shape by reducing pressure and heating, the core rod drawn in (■) is inserted into the tube, and the support tube is made into a round shape and a fiber base material.
■ このファイバ母材を線引きして楕円ジャケット型偏
波面保存光ファイバを得る。■ This fiber base material is drawn to obtain an elliptical jacket type polarization maintaining optical fiber.
［発明が解決しようとする問題点］
しかしながら、上記の■の工程による楕円化においては
減圧値、加熱温度、サポート管の内外径及びＢとＰのガ
ラス膜圧や組成等の多種の要因に大きく影響を受け、こ
れらいずれかの値がわずかに変化しても楕円率が大きく
異なってしまう。従って、楕円率の再現性や長手方向の
均一性に乏しく、このため消光比特性が低下するという
問題があった。消光比を改善する方法として楕円率を大
きく且つＢのモル濃度を高く設定する方法があるが、Ｂ
のモル濃度を高くすると粘性が低下するので楕円形状の
均一化が一層困難となってしまう。[Problems to be Solved by the Invention] However, the ovalization by the above step (2) is greatly affected by various factors such as the pressure reduction value, the heating temperature, the inner and outer diameters of the support tube, and the glass film pressure and composition of B and P. Even if any of these values changes slightly, the ellipticity will vary greatly. Therefore, there is a problem in that the reproducibility of ellipticity and the uniformity in the longitudinal direction are poor, and therefore the extinction ratio characteristics are deteriorated. One way to improve the extinction ratio is to increase the ellipticity and set the molar concentration of B high.
When the molar concentration of is increased, the viscosity decreases, making it even more difficult to make the elliptical shape uniform.
また、コアロッド及び出発石英管のサイズを上述した値
より大きくしようとするとコアロッドとサポート管との
一体化時にクラックが発生しやすくなり、このため例え
ば１０ＫＩｎ以上の長尺化が困難である。Furthermore, if the size of the core rod and the starting quartz tube are made larger than the above-mentioned values, cracks are likely to occur when the core rod and the support tube are integrated, making it difficult to increase the length of the core rod and the support tube, for example, over 10 KIn.
さらに、コアロッドをロッドインする際にこれらの中心
合せが難しく、ファイバの偏心が大きくなりやすいとい
う問題もあった。Furthermore, there is a problem in that it is difficult to center the core rods when they are inserted, and the eccentricity of the fibers tends to increase.
かくして、本発明の目的は上記従来技術の問題点を解消
し、優れた消光比特性を右すると共に長尺化の可能な偏
波面保存光ファイバを歩留りよく得ることができる製造
方法を提供することにある。Thus, an object of the present invention is to provide a manufacturing method capable of solving the above-mentioned problems of the prior art and producing a polarization-maintaining optical fiber that has excellent extinction ratio characteristics and can be extended in length with a high yield. It is in.
［問題点を解決するための手段］
本発明の偏波面保存光ファイバの製造方法は上記目的を
達成するために、コア、クラッド及びサポート層の３層
槙造からなる偏波面保存光ファイバの製造方法において
、Ｇｅ含有コアとシリカクラッドとからなるコアロッド
を断面楕円形状に研磨加工した後、その外周部にＢ及び
Ｐを含有するガラス微粒子を外付けして焼結、線引きす
る方法である。[Means for Solving the Problems] In order to achieve the above object, the method for manufacturing a polarization-maintaining optical fiber of the present invention includes manufacturing a polarization-maintaining optical fiber having a three-layer structure of a core, a cladding, and a support layer. In this method, a core rod consisting of a Ge-containing core and a silica cladding is polished into an elliptical cross-section, and then glass fine particles containing B and P are externally attached to the outer periphery of the core rod, followed by sintering and drawing.
［作用］
すなわち、本発明はコアロッドを直接楕円研磨してその
外周部に８及びＰを含有するサポート層を外付は形成し
、このサポート層によりコアに異方性の応力を加えよう
とするものである。従って、コアロッドの楕円形状は容
易に均一化がなされる。[Operation] That is, in the present invention, a core rod is directly polished into an ellipse, an external support layer containing 8 and P is formed on the outer periphery of the core rod, and an anisotropic stress is applied to the core by this support layer. It is something. Therefore, the elliptical shape of the core rod can be easily made uniform.
また、コアロッドを太くしてもクラックが発生すること
がなく、長尺化が可能となる。Moreover, even if the core rod is made thicker, cracks do not occur, and it becomes possible to make the core rod longer.
［実施例コ
以下、本発明の実施例について添付図面を参照して説明
する。[Embodiments] Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.
第１図ないし第３図は本発明の一実施例に係る偏波面保
存光ファイバの製造方法を示す工程図である。まず、第
１図に示すような比屈折率差０．４％のＧｅドープトコ
ア１及びシリカクラッド２からなる直径３０ｒｎｐａ、
長さ３０ｃｘのコアロッド３を研磨して第２図の如く長
軸径３０１１Ｗ、短軸径１５．（楕円率３３％）の断面
楕円形状に加工する。なお、コア径は１．２５ ｍとす
る。1 to 3 are process diagrams showing a method for manufacturing a polarization-maintaining optical fiber according to an embodiment of the present invention. First, a diameter of 30 rnpa consisting of a Ge-doped core 1 and a silica cladding 2 with a relative refractive index difference of 0.4% as shown in FIG.
A core rod 3 with a length of 30 cx is polished to have a major axis diameter of 3011W and a minor axis diameter of 15 mm as shown in Fig. 2. Processed into an elliptical cross-sectional shape (ellipticity 33%). Note that the core diameter is 1.25 m.
次に、楕円加工されたコアロッド３の外周部にＶＡＤ法
によりＢ及びＰを含有するガラス微粒子を外付けする。Next, glass fine particles containing B and P are attached externally to the outer circumference of the core rod 3 which has been processed into an oval shape by the VAD method.
このとき、焼結後の外径が５０１１１となるようにガラ
ス微粒子の外付けを行なう。また、Ｂのモル濃度は８＋
＋＋ｏ ｆ１％程度とし、Ｐはこの外付は部の゛屈折率
がシリカと同じ値となるように設定してドープする。こ
のようにして外付けされたコアロッド３を焼結すること
により、第３図に示すようにクラッド２の外周部にサポ
ート層４が形成されたファイバ母材を得る。At this time, the glass particles are attached externally so that the outer diameter after sintering is 50111 mm. Also, the molar concentration of B is 8+
++of1%, and P is set and doped so that the refractive index of this external part has the same value as silica. By sintering the core rod 3 attached externally in this manner, a fiber preform in which a support layer 4 is formed on the outer periphery of the cladding 2 is obtained as shown in FIG.
このファイバ母材を線引きして偏波面保存光ファイバを
製造する。This fiber preform is drawn to produce a polarization maintaining optical fiber.
以上のようにして条長１０詠の偏波面保存光ファイバを
製造したところ、その伝送損失は波長１．５５−で０．
２２ｄＢ／７ｍ、消光比−３７ｄＢ／１ｍ、モード複屈
折率５Ｘ１０’及び偏心度０．１ｕｆｌ以下であった。When a polarization maintaining optical fiber with a length of 10 lengths was manufactured as described above, its transmission loss was 0.5 at a wavelength of 1.55.
22 dB/7 m, extinction ratio -37 dB/1 m, mode birefringence 5 x 10', and eccentricity 0.1 ufl or less.
［発明の効果］
以上説明したように本発明によれば、次の如き優れた効
果が発揮される。[Effects of the Invention] As explained above, according to the present invention, the following excellent effects are exhibited.
（１） コアロッドの楕円形状の均一化が容易になさ
れ、消光比特性が向上する。(1) The elliptical shape of the core rod can be easily made uniform, and the extinction ratio characteristics are improved.
■ コアロッドを太くしてもクラックが発生することは
なく、長尺化が可能である。■ Even if the core rod is made thicker, no cracks will occur, and it can be made longer.
（３） コアロッドを太くすることにより、コアロッ
ドとサポート層との境界面におけるゆらぎの影響が緩和
され、低損失化が達成される。(3) By making the core rod thicker, the influence of fluctuations at the interface between the core rod and the support layer is alleviated, and loss can be reduced.
（４） コアロッドを楕円加工した後にサポート層の
外付けを行なうのでファイバの偏心を小さくすることが
できる。(4) Since the support layer is attached externally after the core rod is processed into an oval shape, the eccentricity of the fiber can be reduced.
（５）Ｂを含有するサポート層は融点がシリカに比べて
低くなり、接続特性が向上する。(5) The support layer containing B has a lower melting point than silica, improving connection characteristics.
［Ｆ］） 本発明によるファイバをコヒーレント通信用
光伝送路として使用することが可能となる。[F]) The fiber according to the present invention can be used as an optical transmission line for coherent communication.
（７） ′５Ａ造歩留りが向上するので低コスト化を
図ることができる。(7) Since the '5A production yield is improved, costs can be reduced.
第１図ないし第３図は本発明の一実施例に係る偏波面保
存光ファイバの製造方法を示す工程図である。
図中、１はコア、２はクラッド、３はコアロッド、４は
サポート層である。1 to 3 are process diagrams showing a method for manufacturing a polarization-maintaining optical fiber according to an embodiment of the present invention. In the figure, 1 is a core, 2 is a cladding, 3 is a core rod, and 4 is a support layer.
Claims (1)
面保存光ファイバの製造方法において、Ｇｅ含有コアと
シリカクラッドとからなるコアロッドを断面楕円形状に
研磨加工した後、その外周部にＢ及びＰを含有するガラ
ス微粒子を外付けして焼結、線引きすることを特徴とす
る偏波面保存光ファイバの製造方法。In a method for manufacturing a polarization-maintaining optical fiber having a three-layer structure of a core, a cladding, and a support layer, a core rod consisting of a Ge-containing core and a silica cladding is polished into an elliptical cross-section, and then B and P are applied to the outer periphery of the core rod. A method for producing a polarization-maintaining optical fiber, which comprises externally attaching glass fine particles contained therein, sintering and drawing the fiber.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62136450A JPS63303823A (en) | 1987-05-30 | 1987-05-30 | Production of polarization plane maintaining optical fiber |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62136450A JPS63303823A (en) | 1987-05-30 | 1987-05-30 | Production of polarization plane maintaining optical fiber |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS63303823A true JPS63303823A (en) | 1988-12-12 |
Family
ID=15175394
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP62136450A Pending JPS63303823A (en) | 1987-05-30 | 1987-05-30 | Production of polarization plane maintaining optical fiber |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS63303823A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7450813B2 (en) * | 2006-09-20 | 2008-11-11 | Imra America, Inc. | Rare earth doped and large effective area optical fibers for fiber lasers and amplifiers |
| US8498046B2 (en) | 2008-12-04 | 2013-07-30 | Imra America, Inc. | Highly rare-earth-doped optical fibers for fiber lasers and amplifiers |
-
1987
- 1987-05-30 JP JP62136450A patent/JPS63303823A/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7450813B2 (en) * | 2006-09-20 | 2008-11-11 | Imra America, Inc. | Rare earth doped and large effective area optical fibers for fiber lasers and amplifiers |
| US8213758B2 (en) | 2006-09-20 | 2012-07-03 | Imra America, Inc. | Rare earth doped and large effective area optical fibers for fiber lasers and amplifiers |
| US8542968B2 (en) | 2006-09-20 | 2013-09-24 | Imra America, Inc. | Rare earth doped and large effective area optical fibers for fiber lasers and amplifiers |
| US9151889B2 (en) | 2006-09-20 | 2015-10-06 | Imra America, Inc. | Rare earth doped and large effective area optical fibers for fiber lasers and amplifiers |
| US8498046B2 (en) | 2008-12-04 | 2013-07-30 | Imra America, Inc. | Highly rare-earth-doped optical fibers for fiber lasers and amplifiers |
| US8902493B2 (en) | 2008-12-04 | 2014-12-02 | Imra America, Inc. | Highly rare-earth-doped optical fibers for fiber lasers and amplifiers |
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