JPS627140B2 - - Google Patents
Info
- Publication number
- JPS627140B2 JPS627140B2 JP57011229A JP1122982A JPS627140B2 JP S627140 B2 JPS627140 B2 JP S627140B2 JP 57011229 A JP57011229 A JP 57011229A JP 1122982 A JP1122982 A JP 1122982A JP S627140 B2 JPS627140 B2 JP S627140B2
- Authority
- JP
- Japan
- Prior art keywords
- cladding
- sio
- glass
- core
- clad
- 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
- 238000005253 cladding Methods 0.000 claims description 30
- 229910004298 SiO 2 Inorganic materials 0.000 claims description 19
- 239000011521 glass Substances 0.000 claims description 17
- 239000013307 optical fiber Substances 0.000 claims description 8
- 230000010287 polarization Effects 0.000 description 10
- 229910005793 GeO 2 Inorganic materials 0.000 description 4
- 238000010521 absorption reaction Methods 0.000 description 4
- 230000008018 melting Effects 0.000 description 4
- 238000002844 melting Methods 0.000 description 4
- 239000000463 material Substances 0.000 description 3
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 235000012239 silicon dioxide Nutrition 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 1
- 229910052681 coesite Inorganic materials 0.000 description 1
- 229910052906 cristobalite Inorganic materials 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000010453 quartz Substances 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- 229910052682 stishovite Inorganic materials 0.000 description 1
- 229910052905 tridymite Inorganic materials 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
- C03C13/00—Fibre or filament compositions
- C03C13/04—Fibre optics, e.g. core and clad fibre compositions
- C03C13/045—Silica-containing oxide glass compositions
Landscapes
- Chemical & Material Sciences (AREA)
- Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Glass Compositions (AREA)
- Optical Fibers, Optical Fiber Cores, And Optical Fiber Bundles (AREA)
Description
【発明の詳細な説明】
本発明は低損失な定偏波型光フアイバに関する
ものである。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a low-loss polarization constant optical fiber.
単一モード伝送用の光フアイバで、クラツドを
断面楕円形にし、コアに異方性歪を起こし、光弾
性効果によつて長軸、短軸方向の屈折率、従つて
伝搬定数の差を大きくし、偏波面を保存するいわ
ゆる定偏波型光フアイバは、例えば特開昭56−
99306号によつてすでによく知られている。 An optical fiber for single-mode transmission.The cladding has an elliptical cross-section and anisotropic strain is created in the core, which increases the difference in refractive index in the major and minor axis directions, and therefore in the propagation constant, due to the photoelastic effect. However, so-called polarization-constant optical fiber that preserves the plane of polarization is disclosed in, for example, Japanese Patent Application Laid-Open No.
Already well known from No. 99306.
この構造は、その断面が第１図に示すような３
層構造からなり、コア１１はSiO2ガラス、SiO2
＋B2O3ガラス、SiO2＋GeO2ガラスもしくはSiO2
＋P2O5ガラスが採用できることが指摘されてい
る。また、断面楕円形のクラツド１２としては、
SiO2＋B2O3ガラスもしくはSiO2＋GeO2＋B2O3ガ
ラスが採用できることが指摘されており、外側ク
ラツド１３（ジヤケツトとも称する）としては石
英管が採用できることが指摘されている。 This structure has a cross section as shown in Figure 1.
Consisting of a layered structure, the core 11 is made of SiO 2 glass, SiO 2
+B 2 O 3 glass, SiO 2 +GeO 2 glass or SiO 2
It has been pointed out that +P 2 O 5 glass can be used. Moreover, as the cladding 12 having an oval cross section,
It has been pointed out that SiO 2 +B 2 O 3 glass or SiO 2 +GeO 2 +B 2 O 3 glass can be used, and it has been pointed out that a quartz tube can be used as the outer cladding 13 (also referred to as a jacket).
楕円形クラツドにB2O3含有ガラスを採用する
のは、異方性歪を起こす材料としてB2O3が有力
であるためである。 The reason why B 2 O 3 -containing glass is used for the elliptical cladding is that B 2 O 3 is a powerful material that causes anisotropic strain.
ところが、B2O3は1.2μｍ帯以上の長波長帯で
大きな吸収損失を受けるため、従来定偏波型光フ
アイバの使用を短波長帯に限つていた。 However, since B 2 O 3 suffers from a large absorption loss in the long wavelength band of 1.2 μm or more, the use of polarization-controlled optical fibers has conventionally been limited to short wavelength bands.
これを解決し、長波長帯での使用を実現するた
めに、楕円形クラツドの内側に高純度SiO2の円
形クラツド層を設ける第２図のような構造、ある
いは楕円形クラツドとしてB2O3を含まないSiO2
＋F2O＋P2O5ガラスを用いる第３図のような構造
が提案されている。 In order to solve this problem and realize use in long wavelength bands, a structure as shown in Figure 2 in which a circular cladding layer of high purity SiO 2 is provided inside an elliptical cladding, or a B 2 O 3 cladding layer as an elliptical cladding is used. SiO2 free
A structure as shown in Fig. 3 using +F 2 O + P 2 O 5 glass has been proposed.
第２図において、２１は例えばSiO2＋GeO2ガ
ラスからなるコア、２２は高純度SiO2からなる
第１クラツド、２３はB2O3を含む楕円形第２ク
ラツド、２４は第３クラツドである。 In FIG. 2, 21 is a core made of, for example, SiO 2 +GeO 2 glass, 22 is a first cladding made of high-purity SiO 2 , 23 is an elliptical second cladding containing B 2 O 3 , and 24 is a third cladding. .
また、第３図において３１はコア、３２は高純
度SiO2からなる第１クラツド、３３はSiO2＋F2O
＋P2O5ガラスからる第２クラツド、３４は第３
クラツドである。 Further, in FIG. 3, 31 is a core, 32 is a first clad made of high purity SiO 2 , and 33 is SiO 2 +F 2 O
+2nd clad made of P 2 O 5 glass, 34 is 3rd
It's crap.
しかし、第２図の構造では第１クラツドをあま
り厚くすると定偏波性が悪くなり、さもなくばや
はりB2O3の影響で長波長帯での損失増加はまぬ
がれない。 However, in the structure shown in FIG. 2, if the first cladding is too thick, the polarization stability will deteriorate, and otherwise the loss in the long wavelength band will inevitably increase due to the influence of B 2 O 3 .
また、第３図の構造ではB2O3にる吸収損失の
問題は解消するが、有力な異方性歪付与材がない
ので定偏波性が劣つている。 Furthermore, although the structure shown in FIG. 3 solves the problem of absorption loss due to B 2 O 3 , it has poor polarization stability because there is no effective anisotropic strain imparting material.
本発明は斯かる状況に鑑み、長波長帯での吸収
損失を低減し、かつ定偏波性の優れた定偏波型光
フアイバを提供することを目的とする。 In view of this situation, it is an object of the present invention to provide a constant polarization type optical fiber that reduces absorption loss in a long wavelength band and has excellent polarization constant properties.
すなわち、本発明の要旨は楕円クラツド層を２
層としたことにある。 That is, the gist of the present invention is to form two elliptic cladding layers.
The reason lies in the fact that it is layered.
本発明の構成を一実施例を示す第４図を参照し
て具体的に説明する。 The structure of the present invention will be specifically explained with reference to FIG. 4 showing one embodiment.
第４図において、４１はコアであり例えば
SiO2＋GeO2系ガラスからなり、４２は高純度
SiO2からる第１クラツドである。 In Fig. 4, 41 is the core, for example
Made of SiO 2 + GeO 2 glass, 42 is high purity
The first cladding is made of SiO 2 .
４３はB2O3を含まず、SiO2＋P2O5＋F2O系ガ
ラスからなる楕円形第２クラツドであり、４４は
SiO2＋P2O5＋B2O3系ガラスからなる楕円形第３
クラツドであり、４５は第４クラツドであり、例
えば若干不純物を含んだSiO2ガラスからなる。 43 is an elliptical second clad made of SiO 2 + P 2 O 5 + F 2 O glass without containing B 2 O 3 , and 44 is
Oval third made of SiO 2 +P 2 O 5 +B 2 O 3 -based glass
A fourth cladding 45 is made of, for example, SiO 2 glass containing some impurities.
第２クラツドと第３クラツドは比較的融点が近
似するよう構成し、P2O5を含み他の層に比較し
て融点が低く構成されている。第２クラツドと第
３クラツドとは融点が低く近似している結果、拡
散によりその境界が判然としなくなる場合もあり
うる。 The second cladding and the third cladding are constructed so that their melting points are relatively similar, and contain P 2 O 5 and have a lower melting point than the other layers. Since the melting points of the second clad and the third clad are low and similar, the boundary between them may become unclear due to diffusion.
以上説明したような本発明の定偏波型光フアイ
バであれば、次のような顕著な効果を奏する。 The polarization constant optical fiber of the present invention as described above provides the following remarkable effects.
(1) 楕円クラツド層のうち内側の第２クラツドは
B2O3を含まないので、長波長帯における吸収
損失はほとんどない。(1) The inner second cladding of the elliptic cladding layer is
Since it does not contain B 2 O 3 , there is almost no absorption loss in the long wavelength band.
(2) 楕円クラツド層のうちの外側の第３クラツド
はB2O3を含み、異方性歪付与材として働くの
で、定偏波性に優れている。(2) The outer third cladding of the elliptical cladding layer contains B 2 O 3 and acts as an anisotropic strain imparting material, so it has excellent polarization properties.
(3) 第２クラツドと第３クラツドとは融点が低く
近似しているため、製造上は４層タイプ同様に
あたかも楕円クラツド層が一層のように扱え、
簡便である。(3) Since the melting points of the second clad and third clad are low and similar, in terms of manufacturing, they can be handled as if the elliptical clad layer were one layer, just like the four-layer type.
It's simple.
第１図、第２図および第３図は従来の定偏波型
光フアイバを示す断面説明図であり、第４図は本
発明の一実施例を示す断面説明図である。
４１：コア、４２：第１クラツド、４３：第２
クラツド、４４：第３クラツド、４５：第４クラ
ツド。
1, 2, and 3 are cross-sectional explanatory views showing a conventional polarization constant optical fiber, and FIG. 4 is a cross-sectional view showing an embodiment of the present invention. 41: Core, 42: 1st Clad, 43: 2nd
Clad, 44: Third Clad, 45: Fourth Clad.
Claims (1)
第１クラツドを有し、その外側に断面が楕円形の
第２クラツドを有し、さらにその外側に断面が楕
円形の第３クラツドならびに断面が円形の第４ク
ラツドを有し、前記コアは第１クラツドより屈折
率の高いガラスからなり、前記第１クラツドは高
純度SiO2からなり、前記第２クラツドはSiO2＋
P2O5＋F2O系ガラスからなり、前記第３クラツド
はSiO2＋P2O5＋B2O3系ガラスからなることを特
徴とする定偏波型光フアイバ。1. A core having a circular cross section, a first cladding having a circular cross section outside the core, a second cladding having an elliptical cross section outside the core, and a third cladding having an elliptical cross section outside the core, and a third cladding having an elliptical cross section outside the core. has a circular fourth cladding, the core is made of glass having a higher refractive index than the first cladding, the first cladding is made of high purity SiO 2 , and the second cladding is made of SiO 2 +
1. A polarization-constant optical fiber comprising a P 2 O 5 +F 2 O glass, and the third cladding comprising a SiO 2 +P 2 O 5 +B 2 O 3 glass.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP57011229A JPS58130134A (en) | 1982-01-27 | 1982-01-27 | Constant polarization type optical fiber |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP57011229A JPS58130134A (en) | 1982-01-27 | 1982-01-27 | Constant polarization type optical fiber |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS58130134A JPS58130134A (en) | 1983-08-03 |
| JPS627140B2 true JPS627140B2 (en) | 1987-02-16 |
Family
ID=11772113
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP57011229A Granted JPS58130134A (en) | 1982-01-27 | 1982-01-27 | Constant polarization type optical fiber |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS58130134A (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117263513B (en) * | 2023-09-27 | 2025-12-02 | 长飞光纤光缆股份有限公司 | A method for fabricating elliptical cladding polarization-maintaining optical fiber and the resulting product. |
-
1982
- 1982-01-27 JP JP57011229A patent/JPS58130134A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS58130134A (en) | 1983-08-03 |
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