JPS58214104A - Optical fiber for preserving plane of polarization - Google Patents
Optical fiber for preserving plane of polarizationInfo
- Publication number
- JPS58214104A JPS58214104A JP57096827A JP9682782A JPS58214104A JP S58214104 A JPS58214104 A JP S58214104A JP 57096827 A JP57096827 A JP 57096827A JP 9682782 A JP9682782 A JP 9682782A JP S58214104 A JPS58214104 A JP S58214104A
- Authority
- JP
- Japan
- Prior art keywords
- jacket
- oval
- polarization
- optical fiber
- core
- 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
-
- 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
- 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
- Physics & Mathematics (AREA)
- Chemical & Material Sciences (AREA)
- Optics & Photonics (AREA)
- General Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- General Physics & Mathematics (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】
本発明は偏波面保存光ファイバに係り、特に長尺にわた
り良好な消光比を有するようにするのに好適な偏波面保
存光ファイ・〈に関するものである。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a polarization-maintaining optical fiber, and particularly to a polarization-maintaining optical fiber suitable for having a good extinction ratio over a long length.
単一モード光ファイバは、光通信伝送路として使用でき
るとともに、光の偏光特性を利用した計測の分野にも適
用できる。しかしながら、通常の単一モード光ファイバ
は、曲げ、振動などの外部擾乱により偏光特性が変化し
てしまうので、最近長距゛離にわたって偏光特性が一定
である偏波面保存光ファイバが注目されるようになって
きた。Single-mode optical fibers can be used as optical communication transmission lines, and can also be applied to the field of measurement that utilizes the polarization characteristics of light. However, since the polarization characteristics of ordinary single mode optical fibers change due to external disturbances such as bending and vibration, polarization maintaining optical fibers, which have constant polarization characteristics over long distances, have recently attracted attention. It has become.
ところで、従来の偏波面保存光コアイノくは、第１図に
示すように、ｙ軸方向に励起して偏光した光であっても
長尺の伝搬過程で外部擾乱によってＸ軸方向の成分が生
じ、消光比が小さくなる。このようなことが起こると、
位相差等を利用する光フアイバジャイロスコープ等の計
測器に用いた場合、測定誤差の原因になる。By the way, in the conventional polarization preserving optical core, as shown in Fig. 1, even if the light is excited and polarized in the y-axis direction, a component in the x-axis direction is generated due to external disturbance during the long propagation process. , the extinction ratio becomes smaller. When something like this happens,
When used in measuring instruments such as optical fiber gyroscopes that utilize phase differences, etc., it causes measurement errors.
本発明は上記に鑑みてなされたもので、その目的とする
ところは、長尺にわだ９良好な消光比を有する偏波面保
存光ファイバを提供することにある。The present invention has been made in view of the above, and an object of the present invention is to provide a polarization-maintaining optical fiber having a long length and a good extinction ratio.
本発明の％徴は、中心に断面が円形のガラスコアを有し
、その外周に断面が楕円ｙｆのクラッドを有し、さらに
その外周に断面が楕円形のジャケットを有し、その外周
にはサポートを有し、上記クラッドはＢ２Ｏ３を含まな
いガラスからなり、上記ジャケットはＢ２Ｏ３を含むガ
ラスからなる偏波面保存光ファイバとした点にある。The characteristics of the present invention include a glass core with a circular cross section at the center, a cladding with an elliptical cross section on the outer periphery, a jacket with an elliptical cross section on the outer periphery, and a The polarization maintaining optical fiber has a support, the cladding is made of glass not containing B2O3, and the jacket is made of glass containing B2O3.
以下本発明を第２図に示しだ実施例を用いて詳細に説明
する。The present invention will be explained in detail below using an embodiment shown in FIG.
第２図は本発明の偏波面保存光ファイバの一実施例を示
す断面図である。第２図において、１はＧ ｅＯｎ
Ｓ ｉＯｑ系ガラスからなる断面が円形のコア、２は５
１０２系ガラスからなる断面が楕円形のクラッド、３は
Ｐ ２０、−Ｂ 、０３−８ｉ０２系ガラスからなる断
面が楕円形のジャケット、４はサポートである。なお、
クラッド２の厚さの最小値はコア１の半径以下となって
おり、かつ、クラッド２の断面の楕円形の長軸は、ジャ
ケット乙の断面の楕円形の短軸と一致している。FIG. 2 is a sectional view showing an embodiment of the polarization maintaining optical fiber of the present invention. In FIG. 2, 1 is G eOn
A core with a circular cross section made of SiOq glass, 2 is 5
A cladding having an elliptical cross section made of 102 series glass, 3 a jacket having an elliptical cross section made of P20,-B, 03-8i02 series glass, and 4 a support. In addition,
The minimum value of the thickness of the cladding 2 is less than or equal to the radius of the core 1, and the major axis of the elliptical cross section of the cladding 2 coincides with the minor axis of the elliptical cross section of the jacket B.
次に、第２図に示す断面形状の偏波面保存光ファイバの
製造方法について説明する。Next, a method for manufacturing a polarization-maintaining optical fiber having the cross-sectional shape shown in FIG. 2 will be described.
外径１８咽、厚さ１．５７＋Ｉｌ＋＋の透明石英ガラス
管の内壁に化学気相堆積法によりジャケット６となるＰ
２０５ Ｂ ２０３ Ｓ ｉｏ孫ガラス膜を厚さ１
１Ｊ Ｏｐｍに堆積させ、さらにその内側にクラッド２
となる５１０２系ガラス膜を厚さ１５μｍに堆積させ、
一端を封じ、管内圧を外部より−５ｍｍＨ２Ｏ減圧し、
その後、酸水素バーナで加熱して中空の楕円形状の管に
して、この管内にコア１となる外径１叫、クラッドとの
比屈折率差０．６係の０２０ Ｂ ８１０２系ガラス
ロツド挿入して融着一体化して、断面が第２図と同様の
偏波面保存光ファイバ母材を得る。A jacket 6 was formed by chemical vapor deposition on the inner wall of a transparent quartz glass tube with an outer diameter of 18 mm and a thickness of 1.57+Il++.
205 B 203 S io grandchild glass film thickness 1
1J Opm, and further clad 2 on the inside.
A 5102 glass film with a thickness of 15 μm was deposited,
Seal one end, reduce the internal pressure of the tube by -5 mmH2O from the outside,
After that, it was heated with an oxyhydrogen burner to form a hollow elliptical tube, and a 020B 8102 series glass rod, which would serve as core 1 and had an outer diameter of 1 mm and a relative refractive index difference of 0.6 with the cladding, was inserted into this tube. By fusion and integration, a polarization-maintaining optical fiber preform having a cross section similar to that shown in FIG. 2 is obtained.
そして、この母材を仕様波長に合わせるため適正な石英
ガラス管に挿入した後、加熱延伸して第２図に示す断面
形状の偏波面保存光ファイバを得る。Then, this base material is inserted into a suitable quartz glass tube in order to match the specified wavelength, and then heated and stretched to obtain a polarization-maintaining optical fiber having the cross-sectional shape shown in FIG.
偏波面保存光ファイバの消光比ηは、
η＝−１０Ｌｏｇ ｐｙ／ｐｘ ・・・ （１）こ
こに、ｐｙ；ｙ軸方向に偏光した光の出力ｐｘＨｘ軸方
向に生じた出力（第１図参照）
で表わされ、本発明に係る偏波面保存光ファイバの消光
比ηを測定したところ、ＩＫｍで６８ｄＢを得た。まだ
、本発明に係る偏波面保存光ファイバにｙ軸方向に偏光
した光を入射させたときの伝送損失は１ ｄ−Ｂ／ＫＩ
ＴＩ （波長１．６μｍの光において）、同様にＸ軸方
向に偏光した光を入射させたときの伝送損失は２０ｄＢ
／ＫＩＩ＋（波長１．６μｍの光において）′であった
。このことは、Ｘ軸方向における５ｉ０２系カラスより
なるクラッド２の膜厚が薄く、伝送する光パワーがジャ
ケット６の層までしみ出し、ジャケット層のＯＨ基まだ
はＢ−０結合による吸収損によるものと考えられる。と
ころで、クラッド２の厚さの最小値がコア１の半径と同
等あるいはそれ以上の場合には、ｙ軸、Ｘ軸方向に励起
した光の伝送損失の差として１ｄＢ／に＋ｎ以下しか得
らないので、上記した実施例では、クラッド２の厚さの
最小値はコア１の半径以下となるようにしである。The extinction ratio η of a polarization-maintaining optical fiber is: η=-10Log py/px... (1) Here, py: Output of light polarized in the y-axis direction pxHx Output generated in the axial direction (see Figure 1) ), and when the extinction ratio η of the polarization maintaining optical fiber according to the present invention was measured, it was found to be 68 dB at IKm. However, when light polarized in the y-axis direction is incident on the polarization-maintaining optical fiber according to the present invention, the transmission loss is 1 dB/KI.
TI (for light with a wavelength of 1.6 μm), similarly when light polarized in the X-axis direction is incident, the transmission loss is 20 dB.
/KII+ (for light with a wavelength of 1.6 μm)'. This is because the film thickness of the cladding 2 made of 5i02 glass in the X-axis direction is thin, and the transmitted optical power seeps into the layer of the jacket 6, resulting in absorption loss due to OH groups in the jacket layer and B-0 bonds. it is conceivable that. By the way, if the minimum thickness of the cladding 2 is equal to or greater than the radius of the core 1, the difference in transmission loss of light excited in the y-axis and x-axis directions will be less than 1 dB/+n. Therefore, in the embodiment described above, the minimum thickness of the cladding 2 is set to be equal to or less than the radius of the core 1.
以上のことから、本発明に係る偏波面保存光ファイバは
、長尺にわたりｙ軸方向にだけ偏光した光を良好に伝搬
させることができ、通信用さらには光フアイバジャイロ
スコープ等の計測器用として用いるのに好適である。From the above, the polarization-maintaining optical fiber according to the present invention can propagate light polarized only in the y-axis direction over a long length, and can be used for communications and for measuring instruments such as optical fiber gyroscopes. It is suitable for
以上説明したように、本発明によれば、長尺にわたり良
好な消光比を有するので、通信用、光フアイバジャイロ
スコープ等の計測器用として用いるのに好適であるとい
う効果がある。As explained above, according to the present invention, since it has a good extinction ratio over a long length, it is suitable for use in communications and measuring instruments such as optical fiber gyroscopes.
第１図は偏光した光の伝搬状態を説明するだめの模式図
、第２図は本発明の偏波面保存光ファイバの一実施例を
示す断面図である。
１：コア、２：クラッド、６：ジャケット、４：サポー
ト。FIG. 1 is a schematic diagram for explaining the propagation state of polarized light, and FIG. 2 is a sectional view showing an embodiment of the polarization-maintaining optical fiber of the present invention. 1: core, 2: cladding, 6: jacket, 4: support.
Claims (1)
に断面が楕円形のクラッドを有し、さらにその外周に断
面が楕円形のジャケットを有し、その外周にはサポート
を有し、前記クラッドはＢ、０３を含まないガラスから
なり、前記ジャケットはＢ２Ｏ３を含むガラスからなる
ことを特徴とする偏波面保存光ファイバ。 ２、前記クラッドの厚さの最小値は前記コアの半径以下
としである特許請求の範囲第１項記載の偏波面保存光フ
ァイバ。 ６、前記クラッドの楕円形の断面の長軸を前記ジャケッ
トの楕円形の断面の短軸と一致させである特許請求の範
囲第１項または第２項記載の偏波面保存光ファイノア々
。[Claims] 1. It has a glass core with a circular cross section at the center, a cladding with an elliptical cross section around the outer periphery, a jacket with an elliptical cross section around the outer periphery, and a cladding with an elliptical cross section around the outer periphery. 1. A polarization-maintaining optical fiber having a support, wherein the cladding is made of glass not containing B,03, and the jacket is made of glass containing B2O3. 2. The polarization maintaining optical fiber according to claim 1, wherein the minimum thickness of the cladding is less than or equal to the radius of the core. 6. Polarization maintaining optical fins according to claim 1 or 2, wherein the long axis of the elliptical cross section of the cladding is made to coincide with the short axis of the elliptical cross section of the jacket.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP57096827A JPS58214104A (en) | 1982-06-04 | 1982-06-04 | Optical fiber for preserving plane of polarization |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP57096827A JPS58214104A (en) | 1982-06-04 | 1982-06-04 | Optical fiber for preserving plane of polarization |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS58214104A true JPS58214104A (en) | 1983-12-13 |
Family
ID=14175384
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP57096827A Pending JPS58214104A (en) | 1982-06-04 | 1982-06-04 | Optical fiber for preserving plane of polarization |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS58214104A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6283708A (en) * | 1985-10-08 | 1987-04-17 | Sumitomo Electric Ind Ltd | Constant polarization optical fiber |
| JPS6283707A (en) * | 1985-10-08 | 1987-04-17 | Sumitomo Electric Ind Ltd | Constant polarization optical fiber |
-
1982
- 1982-06-04 JP JP57096827A patent/JPS58214104A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6283708A (en) * | 1985-10-08 | 1987-04-17 | Sumitomo Electric Ind Ltd | Constant polarization optical fiber |
| JPS6283707A (en) * | 1985-10-08 | 1987-04-17 | Sumitomo Electric Ind Ltd | Constant polarization optical fiber |
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