JPS5874535A - Constant polarization type optical fiber - Google Patents
Constant polarization type optical fiberInfo
- Publication number
- JPS5874535A JPS5874535A JP56173370A JP17337081A JPS5874535A JP S5874535 A JPS5874535 A JP S5874535A JP 56173370 A JP56173370 A JP 56173370A JP 17337081 A JP17337081 A JP 17337081A JP S5874535 A JPS5874535 A JP S5874535A
- Authority
- JP
- Japan
- Prior art keywords
- cladding
- optical fiber
- core
- type optical
- constant polarization
- 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.)
- Granted
Links
- 230000010287 polarization Effects 0.000 title claims description 8
- 239000013307 optical fiber Substances 0.000 title claims description 7
- 238000005253 cladding Methods 0.000 claims description 21
- 239000011521 glass Substances 0.000 claims description 10
- 239000011248 coating agent Substances 0.000 claims description 4
- 238000000576 coating method Methods 0.000 claims description 4
- 239000000835 fiber Substances 0.000 claims description 3
- 238000000034 method Methods 0.000 description 12
- 230000008719 thickening Effects 0.000 description 6
- 238000004519 manufacturing process Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 2
- 238000009826 distribution Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 125000002887 hydroxy group Chemical group [H]O* 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)
- Optical Fibers, Optical Fiber Cores, And Optical Fiber Bundles (AREA)
- Glass Compositions (AREA)
Abstract
(57)【要約】本公報は電子出願前の出願データであるた
め要約のデータは記録されません。(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.
Description
【発明の詳細な説明】
不発明はクラッドの断面が楕円形の定偏波型光ファイバ
に関する。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a constant polarization optical fiber whose cladding has an elliptical cross section.
クラッドを楕円にし、コアに異方性歪を起こし、光弾性
効果によって長軸、短軸方向の屈折率、従って伝搬定数
の差を大きくし、長軸、短軸の偏波を保存するいわゆる
定偏波型光ファイバが知られている。The cladding is made into an ellipse, the core is subjected to anisotropic strain, and the photoelastic effect increases the difference in the refractive index and propagation constant in the major and minor axis directions, thereby preserving the polarization of the major and minor axes. Polarized optical fibers are known.
異方性歪を起こすクラッド材料としてはＢ２Ｏ３が有力
とされており、Ｇ ｅ Ｏ２−Ｂ２０．ｌ−Ｓ ｉ Ｏ
，、系ガラスをクラッド材料として用いることが提案さ
れていた。B2O3 is considered to be a promising cladding material that causes anisotropic strain, and G e O2-B20. l-S i O
It has been proposed to use glass from the cladding system as a cladding material.
この上うな定偏波型光ファイバの製造方法としては、肉
付法、外付法、ロッドインチューブ法など種々考えられ
ているが、反応温度が高温であればあるほど外側のガラ
ス被覆からコア方向にＯＨ基が拡散するため伝送損失が
増大する傾向にある。Various methods have been considered for manufacturing such constant polarization optical fibers, such as the thickening method, the external method, and the rod-in-tube method. Since OH groups diffuse in this direction, transmission loss tends to increase.
そこでクラッドの材質として反応温度の比較的低いＰ２
Ｏ５−Ｂ、、 ０８− Ｓ ｉ Ｏ２系ガラスを採用す
ることが提案され、このようなりラッドであればロッド
インチューブ法及び外付法とロッドインチューブ法の組
合せ法により比較的伝送損失の低い元ファイバが得られ
たが、低損失化に有効な肉付法の採用が未だ困難であっ
た。Therefore, P2, which has a relatively low reaction temperature, is used as a material for the cladding.
O5-B,, 08- Si O2-based glass has been proposed to be used, and if it is like this, the transmission loss can be relatively low by the rod-in-tube method and the combination of the external method and rod-in-tube method. Although the original fiber was obtained, it was still difficult to employ a thickening method that is effective for reducing loss.
すなわちクラッドが硬すぎると、山付後クラッドのみを
楕円形に形成することが難しく、また軟かすぎると内面
に反応温度の高いコアを形成することが不可能であった
。That is, if the cladding is too hard, it is difficult to form only the cladding into an elliptical shape after the ridges are formed, and if the cladding is too soft, it is impossible to form a core with a high reaction temperature on the inner surface.
不発明は斯かる状況に鑑み、比較的ポピユラーでかつ低
損失比に有効な肉付法で容易に製造でき、一層の低損失
比が達成できた定偏波型光ファイバを提供することを目
的とする。In view of this situation, the object of the present invention is to provide a constant polarization optical fiber that is relatively popular and can be easily manufactured using a thickening method that is effective for a low loss ratio, and that can achieve an even lower loss ratio. shall be.
不発明の構成を、一実施例を示す図面を参照して具体的
に説明する。The inventive structure will be specifically explained with reference to the drawings showing one embodiment.
第１図において、１Ｆｉコアであり高純度５ｉｎ２で形
成され、２は断面楕円形のクラッドであり、３はガラス
被覆である。In FIG. 1, it is a 1Fi core made of high-purity 5in2, 2 is a cladding with an elliptical cross section, and 3 is a glass coating.
ガラス被覆３は安価なものが望ましいので、通常比較的
強度の低い５ｉｎ１１で形成され、低損失化のため高純
度５１０２で形成したコア１と屈折率においては大差が
ない。Since it is desirable that the glass coating 3 be inexpensive, it is usually made of 5in11, which has relatively low strength, and is not much different in refractive index from the core 1, which is made of high-purity 5102 to reduce loss.
そこでクラッド２は、Ｅ、０８−８１０２°系ガラスも
しくはＰ２Ｏ５”！ＩＩＯ３−８ｉｎ第ＩＯ３−８ｉｎ
−結果的に屈折率は第２図に示すような分布となる。Therefore, the cladding 2 is E, 08-8102° glass or P2O5"!IIO3-8in No. IO3-8in
-As a result, the refractive index has a distribution as shown in FIG.
このクラッド２のドープ量はＢ、０３とＰ２Ｏ，と合計
して８〜１５モル％である。The total doping amount of this cladding 2 is 8 to 15 mol% of B, 03, and P2O.
ドープ量が８モル％未満であると、クラッドが硬くなり
、肉付法で製造しようとした場合に第１図のような断面
形状を構成することが困難となる。If the doping amount is less than 8 mol %, the cladding becomes hard and it becomes difficult to construct the cross-sectional shape as shown in FIG. 1 when attempting to manufacture it by the thickening method.
ドープ量が１５モル％を越える場合には、クラッドが軟
くなり、肉付法で製造しようとした場合にコアを形成す
ることが不可能となる。If the doping amount exceeds 15 mol %, the cladding becomes soft and it becomes impossible to form a core when attempting to manufacture it by the thickening method.
以上説明したような本発明の定偏波型光ファイバであれ
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） コアを高純度Ｓｉｎｇとし、クラッドを低温
反応可能なり２０３ Ｓ １０２系もしくにＰＱ ０
５Ｂ２０：ｌ−８ｉｎ２系ガラスで構成したので、ＯＨ
基拡散が少なく低損失となる。(1) The core is made of high-purity Sing, and the cladding is made of 203 S 102 series or PQ 0, which can be reacted at low temperatures.
5B20: Made of l-8in2 type glass, so OH
Low group diffusion and low loss.
（２） クラッドのドープ量が８〜１５モル％である
ので、肉付法で製造することが可能であり、層低損失化
が達成でき信頼性も高い。(2) Since the doping amount of the cladding is 8 to 15 mol %, it can be manufactured by a thickening method, achieving low layer loss and high reliability.
第１図は本発明の一実施例を示す断面図であり、第２図
はその屈折率分布を示す線図である。
１：コア、２：クラッド、３ニガラス被覆。FIG. 1 is a sectional view showing an embodiment of the present invention, and FIG. 2 is a diagram showing its refractive index distribution. 1: core, 2: cladding, 3 glass coating.
Claims (1)
１の外側に断面が楕円形のクラッド２を有し、該クラッ
ド２の外側にガラス被覆３を有するものにおいて、前記
コア１が高純度５ｉ０２からなり、前記クラッド２がＢ
、Ｏ，−８ｉＯ，系ガラスもしくはＰ２０５− Ｂ２０
３− Ｓ ｉ ０２系ガラステあり、かつ該□クラッド
２におけるＰ２Ｏ５とＢ２Ｏ８の合計ドッグ量が８〜１
５モル％であることを特徴とする定偏波型光ファイバ。In a fiber having a core 1 having a circular cross section at the center of the original fiber, a cladding 2 having an elliptical cross section outside the core 1, and a glass coating 3 outside the cladding 2, the core 1 is It is made of high purity 5i02, and the cladding 2 is B
, O, -8iO, glass or P205-B20
3- There is a S i 02 glass plate, and the total dog amount of P2O5 and B2O8 in the □ cladding 2 is 8 to 1
A constant polarization type optical fiber characterized by having a polarization content of 5 mol%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP56173370A JPS5874535A (en) | 1981-10-29 | 1981-10-29 | Constant polarization type optical fiber |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP56173370A JPS5874535A (en) | 1981-10-29 | 1981-10-29 | Constant polarization type optical fiber |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5874535A true JPS5874535A (en) | 1983-05-06 |
| JPS6238310B2 JPS6238310B2 (en) | 1987-08-17 |
Family
ID=15959131
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP56173370A Granted JPS5874535A (en) | 1981-10-29 | 1981-10-29 | Constant polarization type optical fiber |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5874535A (en) |
-
1981
- 1981-10-29 JP JP56173370A patent/JPS5874535A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6238310B2 (en) | 1987-08-17 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US4801185A (en) | Directional coupler | |
| JPS60112203U (en) | Multi-core fiber for optical transmission | |
| JPS5874535A (en) | Constant polarization type optical fiber | |
| JPS5950043A (en) | Method for manufacturing constant polarization fiber | |
| JPH0212887B2 (en) | ||
| CN222850785U (en) | A polarization-maintaining optical fiber component for a high-density communication system | |
| JP2828251B2 (en) | Optical fiber coupler | |
| JPS6037524Y2 (en) | single polarization optical fiber | |
| JPH01314209A (en) | Fixed polarization optical fiber | |
| JPS58130134A (en) | Constant polarization type optical fiber | |
| JPS5950044A (en) | Production of constant polarization fiber | |
| JPH04362603A (en) | Low-loss optical fiber | |
| JPS62148333A (en) | Method for manufacturing polarized optical fiber | |
| JPS628105A (en) | Polarization maintaining optical fiber | |
| JPS6139361Y2 (en) | ||
| JPS5831303A (en) | Constant polarization type optical fiber | |
| JPH0521043Y2 (en) | ||
| JPH0623807B2 (en) | Optical fiber | |
| JPH0427905A (en) | Polarization keeping optical fiber | |
| JPH0467105A (en) | Polarization maintaining optical fiber | |
| JPS63194207A (en) | Optical fiber for absolutely single polarized wave | |
| JPS59208504A (en) | Optical fiber | |
| JPS59123819U (en) | Branch element | |
| JPS59142502A (en) | Polarizing surface maintaining optical fiber | |
| JPS6313006A (en) | Optical star coupler |