JPH03139605A - High-strength optical fiber of quartz glass system and production thereof - Google Patents
High-strength optical fiber of quartz glass system and production thereofInfo
- Publication number
- JPH03139605A JPH03139605A JP1277263A JP27726389A JPH03139605A JP H03139605 A JPH03139605 A JP H03139605A JP 1277263 A JP1277263 A JP 1277263A JP 27726389 A JP27726389 A JP 27726389A JP H03139605 A JPH03139605 A JP H03139605A
- Authority
- JP
- Japan
- Prior art keywords
- refractive index
- cladding
- fiber
- strength
- 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.)
- Granted
Links
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 title claims abstract description 22
- 239000013307 optical fiber Substances 0.000 title claims description 13
- 238000004519 manufacturing process Methods 0.000 title claims description 5
- 229910052731 fluorine Inorganic materials 0.000 claims abstract description 6
- 239000011737 fluorine Substances 0.000 claims abstract description 6
- 238000005728 strengthening Methods 0.000 claims abstract 7
- PXGOKWXKJXAPGV-UHFFFAOYSA-N Fluorine Chemical compound FF PXGOKWXKJXAPGV-UHFFFAOYSA-N 0.000 claims abstract 3
- 238000005253 cladding Methods 0.000 claims description 38
- 239000000835 fiber Substances 0.000 abstract description 28
- 230000005540 biological transmission Effects 0.000 abstract description 5
- 239000010453 quartz Substances 0.000 abstract 1
- 239000010410 layer Substances 0.000 description 27
- 230000002787 reinforcement Effects 0.000 description 14
- 230000003014 reinforcing effect Effects 0.000 description 9
- 238000009826 distribution Methods 0.000 description 4
- 239000000377 silicon dioxide Substances 0.000 description 4
- YCKRFDGAMUMZLT-UHFFFAOYSA-N Fluorine atom Chemical compound [F] YCKRFDGAMUMZLT-UHFFFAOYSA-N 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 229910052814 silicon oxide Inorganic materials 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 239000011347 resin Substances 0.000 description 2
- 229920005989 resin Polymers 0.000 description 2
- 238000005491 wire drawing Methods 0.000 description 2
- 229910002616 GeOx Inorganic materials 0.000 description 1
- 239000002655 kraft paper Substances 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 239000002344 surface layer Substances 0.000 description 1
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
- C03B37/02—Manufacture of glass fibres or filaments by drawing or extruding, e.g. direct drawing of molten glass from nozzles; Cooling fins therefor
- C03B37/025—Manufacture of glass fibres or filaments by drawing or extruding, e.g. direct drawing of molten glass from nozzles; Cooling fins therefor from reheated softened tubes, rods, fibres or filaments, e.g. drawing fibres from preforms
- C03B37/027—Fibres composed of different sorts of glass, e.g. glass optical 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】
〔産業上の利用分野〕
この発明は、最外層に表面強化層が形成された石英ガラ
ス系高強度光ファイバおよびその製造方法に関するもの
である。DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a silica glass-based high-strength optical fiber having a surface reinforcing layer formed on its outermost layer, and a method for manufacturing the same.
伝送損失特性を低下させることなく高強度を有する石英
ガラス系光ファイバとして第３図に示すものが検討され
ている。図において、１はＧｅ ドープシリカコア、２
はシリカクラッド、３は圧縮応力が残留せしめられたＦ
ドープシリカ表面強化層で、その軟化温度がシリカクラ
ッド２よりも低いために線引き中にクラッドよりも後か
ら固化し、クラッドが線引き時に受けた引張応力の開放
により収縮するときに圧縮応力が残留される。その結果
、光ファイバがその圧縮応力に見合う以上の引張張力を
受けるまで実質的に引張張力を受けることにならないの
で、ファイバ表面傷の成長が抑制され高強度化が図られ
たファイバとなる。The fiber shown in FIG. 3 has been studied as a silica glass optical fiber that has high strength without reducing transmission loss characteristics. In the figure, 1 is a Ge-doped silica core, 2
is silica clad, 3 is F with residual compressive stress
This is a doped silica surface reinforcement layer whose softening temperature is lower than that of silica cladding 2, so it solidifies later than the cladding during wire drawing, and compressive stress remains when the cladding contracts due to the release of the tensile stress received during wire drawing. . As a result, since the optical fiber is not substantially subjected to tensile tension until it receives a tensile tension greater than the compressive stress, the growth of fiber surface flaws is suppressed, resulting in a fiber with increased strength.
しかしながら、通常このファイバの元になるプリフォー
ムの製造に当たっては、専ら表面強化層となる部分の軟
化温度がクラッドのそれよりも十分低くなるようにとい
う配慮がなされ、そのため表面強化層となる部分へのふ
っ素のドープ量が３ｍｇ／ｇ程度のプリフォームが作ら
れ、これを線引張力１５０ｇ程度で線引してファイバと
していた。ところが、得られたファイバの屈折率分布は
第４図のように表面強化層の屈折率がクラッドのそれよ
りも低くなっており、そのためコアークラッド部で３Ｍ
ファイバを構成しても、クラッドを第２のコアとし表面
層を第２のクラッドとするマルチモードも伝搬し光学的
に不都合が生じるという問題があった。However, when manufacturing the preform that is the basis of this fiber, care is taken to ensure that the softening temperature of the part that will become the surface reinforcement layer is sufficiently lower than that of the cladding. A preform with a fluorine doping amount of about 3 mg/g was prepared, and this was drawn into a fiber with a drawing tension of about 150 g. However, in the refractive index distribution of the obtained fiber, as shown in Figure 4, the refractive index of the surface reinforcing layer is lower than that of the cladding, and therefore the core cladding part has a refractive index of 3M.
Even when the fiber is constructed, there is a problem in that a multimode in which the cladding is the second core and the surface layer is the second cladding also propagates, causing optical problems.
この発明者等は、この問題点を解決すべく鋭意研究した
結果、クラッドと表面強化層との屈折率差がＦをドープ
したことにより本来低下する推定値よりも小さい、すな
わち表面強化層に圧縮応力が付与されて光弾性効果によ
り屈折率が高められたということから、もっと表面強化
層に圧縮応力を付与して光弾性効果を高めれば、さらに
屈折率が上昇してクラッドと等しいかもしくはそれ以」
−になしうるとの知見を得た。この発明はこの知見に基
づいてなされたもので、その特徴とする第１の請求項の
発明は、コアークランド−表面強化層からなる石英ガラ
ス系高強度光ファイバであって、前記表面強化層がふっ
素がドープされて軟化温度がクラッドよりも低くなされ
、かつ圧縮応力が残留せしめられて屈折率がクラッドと
等しいかもしくはそれ以上になされてなる石英ガラス系
高強度光ファイバにある。As a result of intensive research to solve this problem, the inventors found that the refractive index difference between the cladding and the surface-strengthened layer was smaller than the estimated value that would originally decrease due to doping with F, that is, Since stress is applied and the refractive index is increased due to the photoelastic effect, if more compressive stress is applied to the surface reinforcement layer to increase the photoelastic effect, the refractive index will further increase and become equal to or even higher than that of the cladding. I”
- We obtained the knowledge that it can be done. This invention has been made based on this knowledge, and the invention of claim 1 is characterized by a silica glass-based high-strength optical fiber comprising a core land-surface reinforcing layer, wherein the surface reinforcing layer The fiber is doped with fluorine so that its softening temperature is lower than that of the cladding, and compressive stress remains to make the refractive index equal to or higher than that of the cladding.
また、第２の請求項の発明は、コア−クラッド−表面強
化層からなり、表面強化層にふっ素がドープされて軟化
温度および屈折率がクラッドのそれよりも低くなされた
石英ガラス系光ファイバプリフォームを、その屈折率が
クラッドのそれと等しいかもしくはそれ以上となる線引
張力で線引きする石英ガラス系高強度光ファイバの製造
方法にある。The invention of the second claim also provides a silica glass optical fiber comprising a core, a cladding, and a surface reinforcing layer, in which the surface reinforcing layer is doped with fluorine to have a softening temperature and a refractive index lower than those of the cladding. The present invention provides a method for manufacturing a silica glass-based high-strength optical fiber, in which the reformed fiber is drawn with a drawing tension such that the refractive index thereof is equal to or higher than that of the cladding.
第１図は、クラッドと表面強化層との間の比屈折率差〔
△−−（（表面強化層の屈折率−クラフトの屈折率）／
クラッドの屈折率）Ｘ１００％〕に対する線引張力との
関係を示している。すなわち、表面強化層にＦをドープ
し、クラッドにはＦをドープするかもしくはドープしな
い場合の両者の相対的なＦのドープ量差に基づく比屈折
率差△−を種々変えてプリフォームを作り、そうして得
られたプリフォームを種々の線引張力で線引きして得ら
れるファイバの表面強化層の屈折率を測定し、その屈折
率がクラッドと等しい点を結んでそれを直線Ａで示し、
斜線部分はその屈折率がクラッドよりも大きな部分を示
している。そこで直線Ａから斜線領域内の線引張力で線
引きすればクラッドを第２のコアとするマルチモードの
伝搬を阻止できる。Figure 1 shows the relative refractive index difference between the cladding and the surface reinforcement layer [
△−−((refractive index of surface reinforcement layer − refractive index of kraft)/
The graph shows the relationship between the drawing tension and the refractive index of the cladding (X100%). That is, preforms are made by doping the surface reinforcement layer with F and doping the cladding with F or not doping the cladding, and varying the relative refractive index difference △- based on the relative difference in the amount of F doped between the two. The refractive index of the surface reinforcing layer of the fiber obtained by drawing the preform thus obtained at various drawing tensions is measured, and the points where the refractive index is equal to that of the cladding are connected and indicated by a straight line A. ,
The shaded area indicates a portion whose refractive index is greater than that of the cladding. Therefore, by drawing a line from the straight line A with a drawing tension within the shaded area, multi-mode propagation using the cladding as the second core can be prevented.
直径５ｍｍのＧｅＯｚ（６ｗｔ％） ＳｉＯｚ（９４
ｗｔ％）コア、５ｉ（ｈクラッド（外径５８ｎ＋ｍ）
、Ｆ −５ｉｎｇ表面強化層（Ｆ含有量０．５ｍｇ／ｇ
、外径６０ｍｍ）の石英ガラス系光ファイバプリフォ
ーム（クラッドと表面強化層の△−＝０．０５％）を線
引張力１５０ｇ７−線引きして外径１２５ｎの３Ｍファ
イバとし、その上に２５０μｍ厚さにＵＶ樹脂をコーテ
ィングした。得られたファイバの屈折率分布を第２図に
示す。図から明らかなように、表面強化層の屈折率ｎは
、１．４５９１であり、クラッドのそれよりも高くなっ
ている。GeOz (6wt%) SiOz (94
wt%) core, 5i (h cladding (outer diameter 58n+m)
, F-5ing surface reinforcement layer (F content 0.5 mg/g
A quartz glass optical fiber preform (Δ-=0.05% of cladding and surface reinforcement layer) with an outer diameter of 60 mm was drawn at a drawing tension of 150 g7 to form a 3M fiber with an outer diameter of 125 nm, and a 250 μm thick It was coated with UV resin. The refractive index distribution of the obtained fiber is shown in FIG. As is clear from the figure, the refractive index n of the surface reinforcement layer is 1.4591, which is higher than that of the cladding.
また、このファイバの伝送特性を測定したところ、従来
のそれがクラッド部をコアとするマルチモードを伴う伝
搬であるのに対して、この発明のファイバは完全なシン
グルモードファイバであり、マルチモードの伝搬は認め
られなかった。In addition, when we measured the transmission characteristics of this fiber, we found that while the conventional fiber propagates with multimode with the cladding as the core, the fiber of this invention is a completely single mode fiber and has multimode propagation. No transmission was observed.
さらに、その破断強度を測定したところ、従来の高強度
ファイバのそれと比較して遜色ないものであった。Furthermore, when its breaking strength was measured, it was comparable to that of conventional high-strength fibers.
直径５ｍｎ＋のＧｅＯｘ（５ｗｔ％） ＳｉＯｚ（９
５ｗｔ％）コア、Ｆ−３ｉｎ２クラツド（Ｆ含有量０．
５ｍｇ／ｇ 、外径５８ｍｍ） 、Ｆ−ＳｉＯｚ表面強
化層（Ｆ含有量１．０ｍｇ／ｇ、外径６０ｍｍ）の石英
ガラス系光ファイバプリフォーム（クラッドと表面強化
層のへｍ＝〇、０５％）を線引張力１５０ｇで線引きし
て外径１２５μｍの３Ｍファイバとし、その上に２５０
Ｉｍ厚さにＵＶ樹脂をコーティングした。このときの
表面強化層の屈折率ｎば１．４５８４であって、クラッ
ドのそれよりも５Ｘ１０−’だけ高かった。GeOx (5 wt%) SiOz (9
5wt%) core, F-3in2 clad (F content 0.
5mg/g, outer diameter 58mm), silica glass optical fiber preform with F-SiOz surface reinforcement layer (F content 1.0mg/g, outer diameter 60mm) (height of cladding and surface reinforcement layer m = 〇, 05 %) was drawn with a drawing tension of 150 g to form a 3M fiber with an outer diameter of 125 μm, and on top of it
Coated with UV resin to Im thickness. The refractive index n of the surface reinforcement layer at this time was 1.4584, which was higher than that of the cladding by 5×10−′.
かくして得られたファイバの伝送特性を測定したが、実
施例■と同様にマルチモードの伝搬は見られなかった。The transmission characteristics of the fiber thus obtained were measured, but as in Example 2, no multimode propagation was observed.
また、破断強度も実施例Ｉとほとんど差異はなかった。Furthermore, there was almost no difference in breaking strength from Example I.
この発明は、以上のようにＦドープシリカによる表面強
化層を有するファイバを形成するにあたり、元になるプ
リフォームの線引張力を表面強化層の屈折率がクラッド
のそれと等しいかもしくはそれ以上になる線引張力で線
引きするので、表面強化層には単に圧縮応力が残留する
だけでなく、その屈折率がクラッドよりも低くなること
がないのでマルチモードの伝搬のない高強度ファイバを
得ることができる。In forming a fiber having a surface-strengthened layer made of F-doped silica as described above, this invention aims to reduce the drawing tension of the original preform to a line at which the refractive index of the surface-strengthened layer is equal to or higher than that of the cladding. Since the fiber is drawn using tensile force, not only compressive stress remains in the surface reinforcing layer, but also the refractive index of the surface reinforcing layer does not become lower than that of the cladding, making it possible to obtain a high-strength fiber without multimode propagation.
第１図は、表面強化層とクラッドとの相対Ｆドープ量と
線引張力との関係を示すグラフ、第２図は、この発明に
よる高強度ファイバの屈折率分布図、第３図は、従来の
高強度ファイバの断面図、第４図は、従来の高強度ファ
イバの屈折率分布図である。
図において、３：表面強化層。Fig. 1 is a graph showing the relationship between the relative F doping amount of the surface reinforcement layer and the cladding and the drawing tension, Fig. 2 is a refractive index distribution diagram of the high-strength fiber according to the present invention, and Fig. 3 is the conventional FIG. 4 is a cross-sectional view of the high-strength fiber of FIG. 4, which is a refractive index distribution diagram of the conventional high-strength fiber. In the figure, 3: surface reinforcement layer.
Claims (1)
高強度光ファイバであって、前記表面強化層がふっ素が
ドープされて軟化温度がクラッドよりも低くされ、かつ
圧縮応力が残留せしめられて屈折率がクラッドと等しい
かもしくはそれ以上とされてなることを特徴とする石英
ガラス系高強度光ファイバ。 ２、コア−クラッド−表面強化層からなり、表面強化層
にふっ素がドープされて軟化温度および屈折率がクラッ
ドのそれよりも低くされた石英ガラス系光ファイバプリ
フォームを、上記表面強化層の屈折率がクラッドのそれ
と等しいかもしくはそれ以上となる線引張力で線引きす
ることを特徴とする石英ガラス系高強度光ファイバの製
造方法。[Claims] 1. A silica glass-based high-strength optical fiber consisting of a core, a cladding, and a surface-strengthened layer, wherein the surface-strengthened layer is doped with fluorine to have a softening temperature lower than that of the cladding, and has a compressive stress. A silica glass-based high-strength optical fiber characterized by having a cladding having a refractive index equal to or higher than that of the cladding. 2. A silica glass-based optical fiber preform consisting of a core, a cladding, and a surface-strengthening layer, in which the surface-strengthening layer is doped with fluorine to have a softening temperature and a refractive index lower than those of the cladding, is heated by the refraction of the surface-strengthening layer. 1. A method for producing a silica glass-based high-strength optical fiber, which comprises drawing with a drawing tension such that the tensile strength is equal to or higher than that of the cladding.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1277263A JP2855531B2 (en) | 1989-10-26 | 1989-10-26 | Quartz glass-based high-strength optical fiber and method of manufacturing the same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1277263A JP2855531B2 (en) | 1989-10-26 | 1989-10-26 | Quartz glass-based high-strength optical fiber and method of manufacturing the same |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH03139605A true JPH03139605A (en) | 1991-06-13 |
| JP2855531B2 JP2855531B2 (en) | 1999-02-10 |
Family
ID=17581085
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1277263A Expired - Fee Related JP2855531B2 (en) | 1989-10-26 | 1989-10-26 | Quartz glass-based high-strength optical fiber and method of manufacturing the same |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2855531B2 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2017015933A (en) * | 2015-07-01 | 2017-01-19 | 株式会社フジクラ | Optical fiber grating, sensor, optical filter, and method for manufacturing optical fiber grating |
| KR102007442B1 (en) * | 2017-11-30 | 2019-08-05 | 주식회사 에이엠제이 | Preparing method of strengthened glass fiber and strengthened glass fiber thereof and electronic fiber including the same |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5662204A (en) * | 1979-10-25 | 1981-05-28 | Nippon Telegr & Teleph Corp <Ntt> | Optical transmission fiber and its manufacture |
| JPS641415A (en) * | 1987-06-23 | 1989-01-05 | Mitsui Toatsu Chem Inc | Resin sheet for embedded pipe |
-
1989
- 1989-10-26 JP JP1277263A patent/JP2855531B2/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5662204A (en) * | 1979-10-25 | 1981-05-28 | Nippon Telegr & Teleph Corp <Ntt> | Optical transmission fiber and its manufacture |
| JPS641415A (en) * | 1987-06-23 | 1989-01-05 | Mitsui Toatsu Chem Inc | Resin sheet for embedded pipe |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2855531B2 (en) | 1999-02-10 |
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