JPH02141436A - Production of polarized wave maintaining optical fiber - Google Patents
Production of polarized wave maintaining optical fiberInfo
- Publication number
- JPH02141436A JPH02141436A JP63292503A JP29250388A JPH02141436A JP H02141436 A JPH02141436 A JP H02141436A JP 63292503 A JP63292503 A JP 63292503A JP 29250388 A JP29250388 A JP 29250388A JP H02141436 A JPH02141436 A JP H02141436A
- Authority
- JP
- Japan
- Prior art keywords
- optical fiber
- maintaining optical
- pit
- quartz
- side pit
- 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 18
- 238000004519 manufacturing process Methods 0.000 title claims description 19
- 239000000463 material Substances 0.000 claims abstract description 30
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims abstract description 28
- 239000010453 quartz Substances 0.000 claims abstract description 24
- 239000011162 core material Substances 0.000 claims description 19
- 238000000034 method Methods 0.000 claims description 17
- 238000005253 cladding Methods 0.000 claims description 10
- 230000002093 peripheral effect Effects 0.000 claims 1
- 235000012239 silicon dioxide Nutrition 0.000 description 19
- 230000010287 polarization Effects 0.000 description 8
- 238000010586 diagram Methods 0.000 description 3
- 238000001556 precipitation Methods 0.000 description 3
- 238000007796 conventional method Methods 0.000 description 2
- 238000000151 deposition Methods 0.000 description 2
- 239000000835 fiber Substances 0.000 description 2
- YBMRDBCBODYGJE-UHFFFAOYSA-N germanium dioxide Chemical compound O=[Ge]=O YBMRDBCBODYGJE-UHFFFAOYSA-N 0.000 description 2
- ZOXJGFHDIHLPTG-UHFFFAOYSA-N Boron Chemical compound [B] ZOXJGFHDIHLPTG-UHFFFAOYSA-N 0.000 description 1
- 229910052796 boron Inorganic materials 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 229910052732 germanium Inorganic materials 0.000 description 1
- GNPVGFCGXDBREM-UHFFFAOYSA-N germanium atom Chemical compound [Ge] GNPVGFCGXDBREM-UHFFFAOYSA-N 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
Classifications
-
- 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
- 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
-
- 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
Abstract
Description
【発明の詳細な説明】
〈産業上の利用分舒〉
本発明はサイドピット型の偏波保持光ファイバの製造方
法に関する。DETAILED DESCRIPTION OF THE INVENTION <Industrial Application> The present invention relates to a method for manufacturing a side pit type polarization maintaining optical fiber.
〈従来の技術〉
従来のサイドピット型の偏波保持光ファイバの製造方法
としてはＭＣＶＤ法によるものがある。このＭＣＶＤ法
による製造方法では、第２図（ａｌに示すように石英バ
イブロの内周面にクラツド材６を析出させ、次いで同図
（ｂｌに示すようにクラツド材６の内側にサイドピット
材８を析出させている。この際、サイドピットに異方性
を持たせなければならないため、サイドピット材析出中
（よ、石英バイブロの回転速度を周期的に変化させてサ
イドピット材８の析出量に異方性を持たせている。その
後、第２図（ｅｌのようにコア材９をサイドピット材８
の内側に析出させ、同図（ｄ）に示すようにコラプスし
てプリフォームを製造している。第２図中、７はバーナ
である。<Prior Art> As a conventional method for manufacturing a side-pit type polarization-maintaining optical fiber, there is a method using the MCVD method. In this manufacturing method using the MCVD method, a cladding material 6 is deposited on the inner circumferential surface of a quartz vibro as shown in FIG. At this time, since the side pits must have anisotropy, the amount of side pit material 8 to be deposited is controlled by periodically changing the rotational speed of the quartz vibro during the side pit material precipitation. After that, as shown in Fig. 2 (el), the core material 9 is coated with the side pit material 8.
The preform is produced by depositing it on the inside of the container and collapsing it as shown in the figure (d). In FIG. 2, 7 is a burner.
〈発明が解決しようとする課題〉
従来のサイドピット型偏波保持光ファイバの製造方法で
は、サイドピットに異方性を持たせるため、サイドピッ
ト析出中に石英パイプの回転速度を周期的に変化させて
いたが、このためには煩雑な制御が必要となっていた。<Problem to be solved by the invention> In the conventional manufacturing method of side-pit type polarization-maintaining optical fiber, in order to give anisotropy to the side pits, the rotation speed of the quartz pipe is periodically changed during side pit precipitation. However, this required complicated control.
また、回転速度を十分精度良く制御しても、所望のサイ
ドピット形状とするのは容易ではなかった。Further, even if the rotational speed is controlled with sufficient accuracy, it is not easy to form the desired side pit shape.
つまり、従来の製造方法においては、設計通り所望の断
面形状を得ることは困難であった。That is, in the conventional manufacturing method, it was difficult to obtain a desired cross-sectional shape as designed.
本発明は上記従来技術に鑑みてなされたもので、異方性
のあるサイドピット型の偏波保持光ファイバを容易かつ
高精度に、しかも再現性良く製造できる方法を提供する
ととを目的とする。The present invention has been made in view of the above-mentioned prior art, and it is an object of the present invention to provide a method for manufacturing an anisotropic side-pit type polarization-maintaining optical fiber easily, with high precision, and with good reproducibility. .
く課題を解決するための手段〉
斯かる目的を達成する本発明の構成は、屈折率がクラッ
ドよりも小さいサイドピットをコアに対して対称に配置
したサイドピット型偏波保持光ファイバを製造する方法
において、コア材の外周にサイドピット材を同心円状に
形成した円柱状部材の両側面を平坦に加工した後、石英
パイプに挿入し、該円柱状部材の両側面と該石英パイプ
の内周面との間に半円柱状の石英ロッドを各々挿入して
、これらをコラプスにより一体化し、プリフォームとす
ることを特徴とする。Means for Solving the Problems> The configuration of the present invention to achieve the above object is to manufacture a side pit type polarization maintaining optical fiber in which side pits having a refractive index smaller than that of the cladding are arranged symmetrically with respect to the core. In this method, after flattening both sides of a cylindrical member in which side pit materials are formed concentrically around the outer periphery of a core material, the cylindrical member is inserted into a quartz pipe, and both sides of the cylindrical member and the inner periphery of the quartz pipe are flattened. It is characterized by inserting semi-cylindrical quartz rods between the surfaces and integrating them by collapse to form a preform.
〈実 施 例〉
以下、本発明の実施例について図面を参照して詳細に説
明する。<Example> Hereinafter, an example of the present invention will be described in detail with reference to the drawings.
第１図に本発明の一実施例を示す。同図（ａ）に示すよ
うにＶＡＤ法によりコア材１の外周にサイドピット材２
を同心円状に形成して円柱状部材となし、その後同図（
ｂ）に示すようにその両側面（つまり、サイドピット材
２の部分）を平坦に加工し、コア材１に対してサイドピ
ット材２が対称に配置された板状とする。FIG. 1 shows an embodiment of the present invention. As shown in Figure (a), the side pit material 2 is attached to the outer periphery of the core material 1 by the VAD method.
are formed into concentric circles to form a cylindrical member, and then the same figure (
As shown in b), both side surfaces (that is, the side pit material 2 portions) are flattened to form a plate shape in which the side pit material 2 is arranged symmetrically with respect to the core material 1.
この後、第１図（ｃｌに示すように石英パイプ４に挿入
すると共にその両側面と石英パイプ４との間に半円柱状
の石英ロッド３，４を挿入して、隙間を埋めるようにす
る。その後、これらをコラプスして一体化し、第１図（
ｄ）に示すプリフォームを製造する。得られたブリフ一
オームよりサイドピット型偏波保持光ファイバを線引す
る。After this, as shown in Fig. 1 (cl), insert into the quartz pipe 4 and insert semi-cylindrical quartz rods 3 and 4 between both sides of the quartz pipe 4 and the quartz pipe 4 to fill the gap. .After that, these are collapsed and integrated to create the image shown in Figure 1 (
Manufacture the preform shown in d). A side pit type polarization maintaining optical fiber is drawn from the obtained brif 1 ohm.
線引されたサイドピット型偏波保持光ファイバは第３図
に示すような断面形状を有し、異方性形状となっている
。即ち、中央のコア１０に対しサイドピット１０が対称
に配置され、その外側にはクラッド１２が形成されてい
る。サイドピット１０ばクラッド１２よりも屈折率が低
いため、第４図（ａ） （ｂ）に示すＸ。The drawn side-pit type polarization-maintaining optical fiber has a cross-sectional shape as shown in FIG. 3, and has an anisotropic shape. That is, the side pits 10 are arranged symmetrically with respect to the central core 10, and the cladding 12 is formed on the outside thereof. Since the side pits 10 have a lower refractive index than the cladding 12, the side pits 10 have a lower refractive index than the cladding 12, so the side pits 10 have a lower refractive index than the cladding 12.
Ｙ方向屈折率分布は互いに異なることとなる。The Y-direction refractive index distributions are different from each other.
このため、Ｘ偏波、Ｙ偏波では光の伝搬定数が異なり、
偏波間の結合が防止されて、偏波保持ができることとな
る。Therefore, the propagation constant of light is different for X polarization and Y polarization,
Coupling between polarized waves is prevented, and polarization can be maintained.
このように本発明の偏波保持光ファイバの製造方法は、
母材段階においてサイドピットの形状加工を行うので、
第３図に示す異方性断面形状を容易に実現することがで
きる。これは、従来のＭＣＶＤ法による製造方法におい
てはサイドピット材の析出に際し石英パイプの回転速度
の制御など煩雑な作業を必要としていたのに比べ、大幅
な簡略化が可能となる。また、従来のＭＣＶＤ法による
製造方法においては、サイドピット材析出時にサイドピ
ット形状を設計通りに保持することが困難であったが、
本発明によればサイドピット材加工後、その形状の変化
は非常に小さく、なおかつ、サイドピット材の加工は現
状の技術で非常に高精度に行うことができる。In this way, the method for manufacturing a polarization-maintaining optical fiber of the present invention includes:
Since the shape of the side pit is processed at the base material stage,
The anisotropic cross-sectional shape shown in FIG. 3 can be easily realized. This can be significantly simplified compared to the conventional manufacturing method using MCVD, which required complicated operations such as controlling the rotational speed of the quartz pipe when depositing the side pit material. In addition, in the conventional manufacturing method using the MCVD method, it was difficult to maintain the side pit shape as designed during side pit material precipitation.
According to the present invention, after the side pit material is processed, the change in its shape is very small, and the side pit material can be processed with very high precision using the current technology.
次に、更に具体的な実施例について第５図を参照して説
明する。Next, a more specific embodiment will be described with reference to FIG. 5.
まず、第５図（ａ）に示すようにＶＡＤ法によりコア材
１３の外周にサイドピット材１４を同心円状に形成して
円柱状部材とした。コア材１３はゲルマニウムを添加し
た石英ガラス、サイドピット材１４はホウ素を添加した
石英ガラスから成る。コア材１３、サイドピット材１４
の純粋石英ガラスに対する比屈折率差はそれぞれ、＋０
．３％、−０，６％である。また、コア材１３の直径は
１０閣、サイドピット材１４の直径は３０ｍである。次
いで、第５図（ａ）に示す円柱状部材の両側面を平面研
摩し、その形状を同図（ｂ）に示すように板状とした。First, as shown in FIG. 5(a), the side pit material 14 was formed concentrically around the outer periphery of the core material 13 by the VAD method to form a cylindrical member. The core material 13 is made of quartz glass doped with germanium, and the side pit material 14 is made of quartz glass doped with boron. Core material 13, side pit material 14
The relative refractive index difference with respect to pure silica glass is +0
．． 3%, -0.6%. Further, the diameter of the core material 13 is 10 m, and the diameter of the side pit material 14 is 30 m. Next, both side surfaces of the cylindrical member shown in FIG. 5(a) were polished to form a plate-like shape as shown in FIG. 5(b).
つまり、研摩された両側面が互いに平行となり、しかも
、その表面からコア材１３が露出するように研摩する。That is, the core material 13 is polished so that both polished side surfaces are parallel to each other and the core material 13 is exposed from the surface.
このように板状に研摩されたコア材１３及びサイドピッ
ト材１４の厚さは９．８ ｗａｎ 、幅は３０．０ｍで
ある。引き続き、板状に研摩されたコア材１３及びサイ
ドピット材１４を第５図［６）に示すように石英パイプ
１６に挿入すると共に板状体の側面と石英パイプ１６の
内周面との間に半円柱状の石英ロッド１５を挿入し、そ
の同の１ｌｆｉｌを埋めるようにする。この半円柱状の
石英ロッド１５は第５図（０）に示す純粋石英ロッドを
ＶＡＤ法により作成し、これを破線から２等分した後、
同図（ｄ）に示す形状となるまで切断面を平面研摩した
もので、正確には半円柱ではなく、その幅は２８．３ｍ
、その厚さは１０ｍである。The core material 13 and side pit material 14 polished into a plate shape in this manner have a thickness of 9.8 wan and a width of 30.0 m. Subsequently, the core material 13 and side pit material 14 that have been polished into a plate shape are inserted into the quartz pipe 16 as shown in FIG. A semi-cylindrical quartz rod 15 is inserted into the hole so as to fill the same 1lfil. This semi-cylindrical quartz rod 15 is made by creating a pure quartz rod shown in FIG.
The cut surface was flat-polished until it had the shape shown in Figure (d), and it is not exactly a semi-cylindrical shape, but its width is 28.3 m.
, its thickness is 10m.
これらが押入される石英パイプ１６は内径３２−２外径
４５隠の純粋石英ガラス製であり、挿入後、これらと一
体にコラプスされ一体化される。その後、延伸し、ロッ
ドイン、コラプスを繰返す乙とにより、第５図（ｆ）に
示すようなりラッド直径２８ｍ＋、：＋ア直径２．３
ｍ 。The quartz pipe 16 into which these are inserted is made of pure quartz glass and has an inner diameter of 32-2 and an outer diameter of 45. After insertion, it is collapsed and integrated with these pipes. After that, by repeating stretching, rod-in, and collapse, the rad diameter is 28 m +, as shown in Fig. 5 (f), and the rod diameter is 2.3 m.
m.
サイドピット幅６．９＋ｗ＋のプリフォームを製作した
。A preform with a side pit width of 6.9+w+ was manufactured.
上記プリフォームを線引し、クラツド径１２５μｍのフ
ァイバを試作し、その特性を評価したところ、カットオ
フ波長１．２０μｍ、波長１．３μｍでの複屈折率が１
．５ Ｘ １０−’、波長１．３μｍ、ファイバ長５ｍ
でのクロストークが−３２ｄＢであった。The above preform was drawn to make a prototype fiber with a cladding diameter of 125 μm, and its characteristics were evaluated. The birefringence at a cutoff wavelength of 1.20 μm and a wavelength of 1.3 μm was 1.
．． 5 x 10-', wavelength 1.3 μm, fiber length 5 m
The crosstalk was -32dB.
尚、上記実施例ではコア材１３．サイドピット材１４．
クラッド材として、それぞれＧｅＯ２＋５ｉ０２．Ｂ２
Ｏ３＋５ｉ０２，５ｉ０２を用いているが、これらの材
料については特に制限はなく、屈折率がコア材、クラッ
ド材、サイドピット材の順に小さくなっていれば良い。In the above embodiment, the core material 13. Side pit material 14.
As cladding materials, GeO2+5i02. B2
Although O3+5i02 and 5i02 are used, there are no particular restrictions on these materials, as long as the refractive index decreases in the order of core material, cladding material, and side pit material.
〈発明の効果〉
以上、実施例に基づいて具体的に説明したように本発明
はサイドピット型の偏波保持光ファイバを容易かつ高精
度に、しがも再現性良く製造することができ、偏波保持
光ファイバの量産化に効果的である。<Effects of the Invention> As described above in detail based on the examples, the present invention enables the manufacture of side pit type polarization maintaining optical fibers easily, with high precision, and with good reproducibility. This is effective for mass production of polarization-maintaining optical fibers.
第１図（ａ）、 （ｂ）、 （０７，（ｄ）は本発明の
一実施例にかかる偏波保持光ファイバの製造方法を示す
工程図、第２図（ａＬ （ｂＬ （０）、 （ｄ）は従
来の調波保持光ファイバの製造方法を示す工程図、第３
図はプリフォームの断面図、第４図Ｔａ）、 （ｂｌは
プリフォームのＸ軸、Ｙ軸方向の屈折率分布を示すグラ
フ、第５図（ａｌｔ （ｂＬ （ｃ）、 （ｄＬ （ｅ
Ｌ （ｆ）は本発明の他の実施例にかかる偏波保持光フ
ァイバの製造方法を示す工程図である。
図面中、
１．１３はコア材、
２．１４はサイドピット材、
３．１５は半円柱状の石英ロッド、
４．１６は石英パイプである。FIGS. 1(a), (b), (07, (d) are process diagrams showing a method for manufacturing a polarization-maintaining optical fiber according to an embodiment of the present invention, and FIG. 2(aL (bL (0), (d) is a process diagram showing a conventional method for manufacturing a harmonic-maintaining optical fiber;
The figure is a cross-sectional view of the preform;
L(f) is a process diagram showing a method for manufacturing a polarization maintaining optical fiber according to another embodiment of the present invention. In the drawings, 1.13 is a core material, 2.14 is a side pit material, 3.15 is a semi-cylindrical quartz rod, and 4.16 is a quartz pipe.
Claims (1)
して対称に配置したサイドピット型偏波保持光ファイバ
を製造する方法において、コア材の外周にサイドピット
材を同心円状に形成した円柱状部材の両側面を平坦に加
工した後、石英パイプに挿入し、該円柱状部材の両側面
と該石英パイプの内周面との間に半円柱状の石英ロッド
を各々挿入して、これらをコラプスにより一体化し、プ
リフォームと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 side-pit type polarization-maintaining optical fiber in which side pits with a refractive index smaller than that of the cladding are arranged symmetrically with respect to the core, a cylindrical member in which side pit materials are formed concentrically around the outer periphery of a core material is used. After processing both sides to be flat, it is inserted into a quartz pipe, and semi-cylindrical quartz rods are inserted between both sides of the cylindrical member and the inner peripheral surface of the quartz pipe, and these are collapsed. A method for manufacturing a polarization-maintaining optical fiber, characterized by integrating it into a preform.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63292503A JPH02141436A (en) | 1988-11-21 | 1988-11-21 | Production of polarized wave maintaining optical fiber |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63292503A JPH02141436A (en) | 1988-11-21 | 1988-11-21 | Production of polarized wave maintaining optical fiber |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH02141436A true JPH02141436A (en) | 1990-05-30 |
Family
ID=17782659
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP63292503A Pending JPH02141436A (en) | 1988-11-21 | 1988-11-21 | Production of polarized wave maintaining optical fiber |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH02141436A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2683053A1 (en) * | 1991-10-29 | 1993-04-30 | Thomson Csf | OPTICAL FIBER AND METHOD OF MANUFACTURE. |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5954635A (en) * | 1982-09-20 | 1984-03-29 | Hitachi Cable Ltd | Preparation of optical fiber preserving plane of polarization |
| JPS60260442A (en) * | 1984-06-06 | 1985-12-23 | Sumitomo Electric Ind Ltd | Preparation of fixed polarisation fiber |
-
1988
- 1988-11-21 JP JP63292503A patent/JPH02141436A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5954635A (en) * | 1982-09-20 | 1984-03-29 | Hitachi Cable Ltd | Preparation of optical fiber preserving plane of polarization |
| JPS60260442A (en) * | 1984-06-06 | 1985-12-23 | Sumitomo Electric Ind Ltd | Preparation of fixed polarisation fiber |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2683053A1 (en) * | 1991-10-29 | 1993-04-30 | Thomson Csf | OPTICAL FIBER AND METHOD OF MANUFACTURE. |
| US5309540A (en) * | 1991-10-29 | 1994-05-03 | Thomson-Csf | Optical fiber sensor and a manufacturing process for making same |
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