JPS5954635A - Preparation of optical fiber preserving plane of polarization - Google Patents
Preparation of optical fiber preserving plane of polarizationInfo
- Publication number
- JPS5954635A JPS5954635A JP57163435A JP16343582A JPS5954635A JP S5954635 A JPS5954635 A JP S5954635A JP 57163435 A JP57163435 A JP 57163435A JP 16343582 A JP16343582 A JP 16343582A JP S5954635 A JPS5954635 A JP S5954635A
- Authority
- JP
- Japan
- Prior art keywords
- glass
- polarization
- rod
- core
- optical fiber
- 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
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
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】
本発明し」、特に、サイドピット型の偏波面保存光ファ
イバの製造法に関するものである。DETAILED DESCRIPTION OF THE INVENTION The present invention relates, in particular, to a method for manufacturing a side pit type polarization maintaining optical fiber.
偏波面保存光ファイバは、光フアイバ断面の直交するモ
ード間の伝播定数差を大きくすることによって実現でき
る。そして、伝播定数差を犬きくするには、コアに異方
向性歪を加え光弾性効果によって発生する複屈折率を利
用する方法がある。A polarization-maintaining optical fiber can be realized by increasing the difference in propagation constant between orthogonal modes in the cross section of the optical fiber. In order to increase the difference in propagation constant, there is a method of applying anisotropic strain to the core and utilizing the birefringence generated by the photoelastic effect.
この異方向性歪を生じさせる光コアイノくには楕円形状
のクラッドを有する型およびクラッドをコアの側部に配
置するサイドピット型がある。Optical cores that produce this anisotropic strain include types that have an elliptical cladding and side pit types that have the cladding placed on the sides of the core.
しかして、前者の楕円形状のクラッドを有する型におい
ては、クラッド用ガラス膜をガラス管内壁に添着する際
、クラッド用ガラス膜の熱膨張係数が大きいため製造時
にクラックを生じ易く、また、クラッドの楕円形状の制
御が難しく、結合長（ビート長消光比）の再現性が困難
である。後者のサイドビットｕにおいては、ガラス管内
に挿入するクラッド用母材の研削時にクラックが入り易
く、また、加工精度が悪いとコアが変形する等の欠点を
有している。However, in the former type having an elliptical cladding, when the cladding glass film is attached to the inner wall of the glass tube, cracks tend to occur during manufacturing because the cladding glass film has a large coefficient of thermal expansion. It is difficult to control the elliptical shape, and the reproducibility of the bond length (beat length extinction ratio) is difficult. The latter side bit u has drawbacks such as being prone to cracks during grinding of the clad base material inserted into the glass tube, and deformation of the core due to poor machining accuracy.
本発明の目的は、上記欠点を除去し、製造が容易で、し
かも、偏波面特性の良好な偏波面保存光ファイバの製造
法を提供することにある。。SUMMARY OF THE INVENTION An object of the present invention is to provide a method for manufacturing a polarization-maintaining optical fiber that is easy to manufacture and has good polarization properties by eliminating the above-mentioned drawbacks. .
本発明は、一対の半円柱状ガラスロットの平ＩＹ１１部
を７士向させ、そのλ・１而間の］咄方向中央部にコア
用カラス「１ノｌ−を配置１すし、このコア用ガラスロ
、ソ ・１ノ両１１１１ＩＫｆｉ＆ ｍｌ ノ′用イｆ
ラスｌ：＋ ７１−ノ外周１．ｒ＋’、ｉ １．レタ
一致。In the present invention, the flat IY11 parts of a pair of semi-cylindrical glass rods are oriented 7 times, and a core crow "1 no l-" is placed in the center part in the chewing direction between the λ Glass slot, so, 1 no both 1111 IKfi & ml no' f
Russ l: +71-outer circumference 1. r+', i 1. Letter match.
−４−おｊ（’； 、Ｉ）ｙ （７，） ｙｔａ １＋
’＋を存い２．膨、長係数カ、前記１・□円行状ガンス
トツトより大ぺな一タ・１の平版ガラスを配置 □した
状態でガラス管内に挿入砦、このカラス省外部から加、
＋、）７５しながら延伸することを％ Ｃ’ｌとするも
のである。-4-oj('; ,I)y (7,) yta 1+
' + 2. Insert a flat plate glass with a diameter of 1 mm larger than the above-mentioned 1 □ circular gun stock into the glass tube, and add it from the outside.
+, ) 75% C'l.
以１’、本光明の一実施例を図面に１．！１（ついで説
明する。第１図は木ｇ明になる偏波面保存）しンアイ・
・の加熱延伸前の構造を示す横断面図、第２図Ｑ、１第
１図の内部構、；／、！、、を分解□して示した横断面
図て、１Ｑ、］−半円柱状イｉ英ガラス自ット、？１Ｂ
２０．．を８モル％ａ有する平板ガ□ラス、６はコア用
ガラスロット、４は／ヤケノド用の石英ガラス管であり
、同形状に成形され／ζ一対の１へ円柱状イ］膵ガラス
ｒ・ソト１の゛ビー面部を対向さぜた対面間の１１ｑ１
１方向中火部にコア用ガラスロット６を配置し、このコ
ア用カラス「−１ノド６の両側にコア用カラスロット乙
の外周面に一致１−る形状の端面を有し熱膨張係数が半
円柱状石英ガラスロット１より大きな一対の平、板イブ
ラス２を配置した状態で石英ガラス管４内に挿入し、こ
の石英ガラス管４の外部から加熱しながら延伸する偏波
面保存光ファイバのｍｊ８４．法であり、この場合の平
板ガラス２の厚さは１ ｍｍで、コア世ガラスロット乙
の外径と同寸法でやる。ジャケット用石英ガラス・び４
は外径が２０ｍｍ、内径が１６＋ｎｍで、コア用カラス
「コツドロと接触する羽根ガラス２９．端而は、コア用
ガラスロット乙の外周に一致するように高精度に研磨成
形して、密着性が良く、加熱延伸に際して気泡のとり込
みをなくしである。Hereinafter, an embodiment of this light is shown in the drawings.1. ! I
・A cross-sectional view showing the structure before heating and stretching, FIG. 2 Q, 1 Internal structure of FIG. 1, ;/,! A cross-sectional view showing an exploded □ of , 1Q, ] - semi-cylindrical glass itself, ? 1B
20. ．． 6 is a glass rod for the core, 4 is a quartz glass tube for the burnt throat, and is molded into the same shape / cylindrical to 1 of a pair of ζ pancreatic glass r. 11q1 between the opposing faces with the Bea surface parts of 1 facing each other
A core glass slot 6 is arranged in the medium heat section in one direction, and the core glass slot 6 has end faces on both sides of the core glass slot 6 having a shape that matches the outer peripheral surface of the core glass slot B and has a coefficient of thermal expansion. mj84 of a polarization preserving optical fiber which is inserted into a quartz glass tube 4 with a pair of flat plate glass 2 larger than the semi-cylindrical quartz glass lot 1 and stretched while being heated from the outside of the quartz glass tube 4. In this case, the thickness of the flat glass 2 is 1 mm, which is the same size as the outer diameter of the core glass lot.
The outer diameter is 20 mm and the inner diameter is 16+ nm. This is good because it eliminates the inclusion of air bubbles during heating and stretching.
まだ、外層にクツラドを翁するコア用ガラスロノｌ−６
を用いることにより、加熱延伸時に、平板ガ）ス２’、
ｌ：’め接触面の不□均性に起因して生じる伝送ｉ失の
増□加をｌｌｌイ消ず乏こ左麻できた。Glass Rono L-6 for the core that still has Kutsurad on the outer layer
By using the flat gas 2' during heating and stretching,
l:' The increase in transmission loss caused by the non-uniformity of the contact surface can be avoided.
なお、石英ガラス管４と半円柱状石英ガラスロソ１．１
とは同一組成のガラス月をイσｌ削、研磨したものであ
るだめ、製造時にクランクを生じることがなく、平板ガ
ラス２は加工容↓“１な形状であるだめ、クラックを生
じることなしに高精度に加工することが容易である。In addition, the quartz glass tube 4 and the semi-cylindrical quartz glass rotor 1.1
flat glass 2 is made by grinding and polishing a glass plate with the same composition, so there will be no cranking during manufacturing, and the flat glass 2 has a shape that is easy to process, so it can be heated to high temperatures without cracking. Easy to process with precision.
以上説明したように、本発明によれば、製造過程におい
てクラックを生じることなく高精度の加工が可能で偏波
面特性の良好な偏波面保存光ファイバを容易に製造する
ことができる。まだ、平板ガラス、半円柱状ガラスロッ
トおよびガラス管の熱膨張係数差並びに平板ガラスおよ
びコア用ガラス凸ツドの寸法を設定することにより結合
長を任意に制両することができる。さらに、加熱延伸前
の各部品の寸法を長尺にすることにより、偏波面保存光
ファイバの長尺化が容易であるなど、すぐれた工業的効
果を奏することができる。As described above, according to the present invention, it is possible to easily manufacture a polarization-maintaining optical fiber that can be processed with high precision and has good polarization characteristics without causing cracks during the manufacturing process. However, the bond length can be controlled arbitrarily by setting the difference in thermal expansion coefficient between the flat glass, the semi-cylindrical glass rod and the glass tube, and the dimensions of the flat glass and the core glass protrusion. Furthermore, by elongating the dimensions of each component before heating and stretching, it is possible to produce excellent industrial effects, such as making it easier to lengthen the polarization-maintaining optical fiber.
第１図は本発明の一実施例になる偏波面保存光ファイバ
の加熱延伸前の構造を示す横断面図、第２図は第１図の
内部構造を分解して示した横断面図である。
１：半円柱状石英ガラスロット、
２二平板ガラス、
６：コア用ガラスロット、
４：ジャケット用石英ガラス管６
坏 １ 菌
緑 Ｚ凹FIG. 1 is a cross-sectional view showing the structure of a polarization-maintaining optical fiber according to an embodiment of the present invention before heating and stretching, and FIG. 2 is a cross-sectional view showing an exploded internal structure of FIG. 1. . 1: Semi-cylindrical quartz glass rod, 2: Flat glass, 6: Glass rod for core, 4: Quartz glass tube for jacket 6. 1 Fungi green Z concave
Claims (1)
その対面間の軸方向中央部にコア用ガラスロッドを配置
し、このコア用ガラスロッドの両［１１１に該コア用ガ
ラスロッドの外周面に一致する形状の端面を有し熱膨張
係数が前記半円柱状ガラスロットより大きな一対の平板
ガラスを配置した状態でガラス管内に挿入し、このガラ
ス管外部から加熱しながら延伸することを特徴とする偏
波面保存光ファイバの製造法。 ２、前記コア用ガラスロッドが、外層にクラッドを有す
る？１！ｊ作請求の範囲第１項記載の偏波面保存光ファ
イバの製造法。[Claims] 1. A pair of semi-cylindrical glass rods with their flat sides facing each other,
A glass rod for a core is arranged in the center in the axial direction between the opposing faces, and both ends of the glass rod for the core have an end face having a shape that matches the outer circumferential surface of the glass rod for the core, and a coefficient of thermal expansion that is half of the above. A method for manufacturing a polarization-maintaining optical fiber, which comprises inserting a pair of flat glasses larger than a cylindrical glass lot into a glass tube, and stretching the glass tube while heating it from the outside. 2. Does the core glass rod have a cladding on the outer layer? 1! j. A method for manufacturing a polarization-maintaining optical fiber according to claim 1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP57163435A JPS5954635A (en) | 1982-09-20 | 1982-09-20 | Preparation of optical fiber preserving plane of polarization |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP57163435A JPS5954635A (en) | 1982-09-20 | 1982-09-20 | Preparation of optical fiber preserving plane of polarization |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS5954635A true JPS5954635A (en) | 1984-03-29 |
Family
ID=15773832
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP57163435A Pending JPS5954635A (en) | 1982-09-20 | 1982-09-20 | Preparation of optical fiber preserving plane of polarization |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5954635A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4851025A (en) * | 1986-12-03 | 1989-07-25 | Schott Glaswerke | Process for producing a planar optical waveguide |
| JPH02141436A (en) * | 1988-11-21 | 1990-05-30 | Sumitomo Electric Ind Ltd | Production of polarized wave maintaining optical fiber |
-
1982
- 1982-09-20 JP JP57163435A patent/JPS5954635A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4851025A (en) * | 1986-12-03 | 1989-07-25 | Schott Glaswerke | Process for producing a planar optical waveguide |
| JPH02141436A (en) * | 1988-11-21 | 1990-05-30 | Sumitomo Electric Ind Ltd | Production of polarized wave maintaining optical fiber |
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