JPS6163543A - Quartz-based optical fiber - Google Patents
Quartz-based optical fiberInfo
- Publication number
- JPS6163543A JPS6163543A JP59183483A JP18348384A JPS6163543A JP S6163543 A JPS6163543 A JP S6163543A JP 59183483 A JP59183483 A JP 59183483A JP 18348384 A JP18348384 A JP 18348384A JP S6163543 A JPS6163543 A JP S6163543A
- Authority
- JP
- Japan
- Prior art keywords
- quartz
- fluorine
- germanium
- optical fiber
- doped
- 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
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 title claims abstract description 72
- 239000010453 quartz Substances 0.000 title claims abstract description 48
- 239000013307 optical fiber Substances 0.000 title claims abstract description 27
- 229910052731 fluorine Inorganic materials 0.000 claims abstract description 26
- 239000011737 fluorine Substances 0.000 claims abstract description 26
- 229910052732 germanium Inorganic materials 0.000 claims abstract description 19
- GNPVGFCGXDBREM-UHFFFAOYSA-N germanium atom Chemical compound [Ge] GNPVGFCGXDBREM-UHFFFAOYSA-N 0.000 claims abstract description 19
- PXGOKWXKJXAPGV-UHFFFAOYSA-N Fluorine Chemical compound FF PXGOKWXKJXAPGV-UHFFFAOYSA-N 0.000 claims abstract 7
- 238000005253 cladding Methods 0.000 claims description 13
- 239000000377 silicon dioxide Substances 0.000 claims description 12
- 230000005855 radiation Effects 0.000 abstract description 11
- 230000005540 biological transmission Effects 0.000 abstract description 8
- 239000000835 fiber Substances 0.000 abstract description 5
- 125000002887 hydroxy group Chemical group [H]O* 0.000 abstract description 5
- 238000006243 chemical reaction Methods 0.000 abstract description 3
- 239000001257 hydrogen Substances 0.000 abstract description 3
- 229910052739 hydrogen Inorganic materials 0.000 abstract description 3
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 abstract description 2
- 230000007847 structural defect Effects 0.000 abstract description 2
- 238000000034 method Methods 0.000 abstract 1
- YCKRFDGAMUMZLT-UHFFFAOYSA-N Fluorine atom Chemical compound [F] YCKRFDGAMUMZLT-UHFFFAOYSA-N 0.000 description 17
- 230000003287 optical effect Effects 0.000 description 4
- 238000010521 absorption reaction Methods 0.000 description 3
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000002019 doping agent Substances 0.000 description 2
- YBMRDBCBODYGJE-UHFFFAOYSA-N germanium dioxide Chemical compound O=[Ge]=O YBMRDBCBODYGJE-UHFFFAOYSA-N 0.000 description 2
- 239000001301 oxygen Substances 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- 230000007423 decrease Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 125000001153 fluoro group Chemical group F* 0.000 description 1
- 150000002431 hydrogen Chemical class 0.000 description 1
- 230000031700 light absorption Effects 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
Description
【発明の詳細な説明】
（発明の技術分野）
本発明は、ゲルマニウムがドープされている石英コアと
フッ素がドープされている石英クラッドとを有する石英
系光ファイ、バに関する。DETAILED DESCRIPTION OF THE INVENTION (Technical Field of the Invention) The present invention relates to a silica-based optical fiber having a quartz core doped with germanium and a quartz cladding doped with fluorine.
（発明の技術的背景）
従来、純石英コアと、低屈折率ドーパントであるフッ素
を含む石英クラッドとを有する石英系光ファイバが知ら
れており、耐放射線用光ファイバ等として用いられてい
る。(Technical Background of the Invention) Conventionally, quartz-based optical fibers having a pure quartz core and a quartz cladding containing fluorine, which is a low refractive index dopant, are known, and are used as radiation-resistant optical fibers and the like.
そして、最近では、光ファイバの広帯域化を図るために
純石英コアに高屈折率ドーパントであるゲルマニウムを
ドープしてグレーデッド型の屈折率分布を持つ石英系光
ファイバが提案されている。Recently, silica-based optical fibers have been proposed in which a pure quartz core is doped with germanium, which is a high refractive index dopant, to have a graded refractive index distribution in order to widen the bandwidth of optical fibers.
（背景技術の問題点）
しかし、かかるゲルマニウムをドープした石英系光ファ
イバでは、放射線照射によってゲルマニウムが電子捕獲
中心として大きく作用するため、紫外域に大きな吸収帯
を生じ、その裾の影響で光伝送損失が著しく増加してし
まう、従って、このゲルマニウムをドープした石英系光
ファイバは耐放射線用光ファイバとしては不適である。(Problems in the Background Art) However, in such germanium-doped silica optical fibers, germanium acts largely as an electron trapping center when irradiated with radiation, resulting in a large absorption band in the ultraviolet region, which causes light transmission due to the influence of its tail. The loss increases significantly, and therefore, this germanium-doped silica-based optical fiber is unsuitable as a radiation-resistant optical fiber.
（発明の目的）
本発明の目的は、広帯域でありながら耐放射線特性が優
れている石英系光ファイバを提供することにある。(Objective of the Invention) An object of the present invention is to provide a silica-based optical fiber that has a wide band and has excellent radiation resistance characteristics.
（発明の概要）
本発明は、ゲルマニウムがドープされている石英コアと
、フッ素がドープされている石英クラッドとを有する石
英系光ファイバにおいて、前記ゲルマニウムがドープさ
れている石英コアにフッ素を更にドープしたことを特徴
とする。(Summary of the Invention) The present invention provides a quartz-based optical fiber having a quartz core doped with germanium and a quartz cladding doped with fluorine, in which the quartz core doped with germanium is further doped with fluorine. It is characterized by what it did.
（発明の実施例）
以下、本発明の実施例を図面を参照して詳細に説明する
。(Embodiments of the Invention) Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
本発明に係る石英系光ファイバは、第１図に示すように
、石英製のコアｌと石英製のクラッド２とを備えるグレ
ーデッドインデックス型ファイバ構造を有し、石英コア
ｌは５０ｇｍ径に、又石英クラッド２はｌ ２５ ｐ、
ｍ外径に形成されている。As shown in FIG. 1, the silica-based optical fiber according to the present invention has a graded index fiber structure comprising a quartz core l and a quartz cladding 2, and the quartz core l has a diameter of 50 gm. Also, quartz cladding 2 is l 25 p,
It is formed with an outer diameter of m.
そして、石英クラッド２はフッ素が３０ＰｐＨドープさ
れて屈折率が低下しており、石英コアｌはゲルマニウム
がｌＯｍｏ１％、フッ素が３０ｐｐ■それぞれドープさ
れて屈折率が上昇している。The quartz cladding 2 is doped with 30 ppph of fluorine to lower its refractive index, and the quartz core 1 is doped with 10 mo of germanium and 30 pp of fluorine to increase its refractive index.
さて、石英コアｌにゲルマニウムの他にフッ素をドープ
した本発明の石英系光ファイバに放射線を照射してその
光伝送損失増加を調べたところ、第２図の（Ａ）で示す
ように、低損失特性を示した。即ち１本発明の石英系光
ファイバに、１，０２ＸＩＯ４Ｒ／ｈｒの照射線量率で
放射線を照射しつつＬＥＤ光源により０．８５ＩＬｍ波
ｉの光を入射したところ、その伝送損失増加は照射時間
に略比例して増加したが、６０分の照射でも約８ ｄ
Ｂ ／ Ｋ ｍの低損失増加に抑えることができた。Now, when we irradiated the silica-based optical fiber of the present invention, in which the quartz core L was doped with fluorine in addition to germanium, and investigated the increase in optical transmission loss, we found that the increase in optical transmission loss was low, as shown in (A) in Figure 2. The loss characteristics are shown. That is, when the silica-based optical fiber of the present invention was irradiated with radiation at a dose rate of 1,02XIO4R/hr and 0.85 ILm wave i was incident on it from an LED light source, the increase in transmission loss was approximately equal to the irradiation time. It increased proportionally, but even after 60 minutes of irradiation, about 8 d
It was possible to suppress the increase in loss to a low level of B/K m.
これは、石英コア１のＳｉＯの抜けた欠陥やＧｅＯ２の
０（酸素）が抜けた欠陥に、電子ではなくフッ素が捕獲
され、紫外域での吸収帯の増加が抑制されたことによる
と考えられる。This is thought to be due to the fact that fluorine, rather than electrons, was captured in the defects of SiO in quartz core 1 and the defects of GeO2 in which 0 (oxygen) was missing, suppressing the increase in the absorption band in the ultraviolet region. .
比較のために、ゲルマニウムが１０ｗ０１％ドープされ
た直径５０ ｐ、、ｔａの石英コアと、フッ素が３０
ＰＰＩ ドープされた外径１２５ｇｍの石英クラッドと
から成るグレーデッドインデックス型光ファイバを用意
し、上述したと同一条件でその光伝送損失増加を調べた
ところ、第２図の（Ｅ）に示すように、４０分の放射線
照射で約８ｄＢ／ Ｋ ｍの損失増加を示し、６０分の
照射では約１０．５ｄＢ／Ｋｍの大きな損失増加を示し
た。For comparison, a quartz core of diameter 50 p,,ta doped with 10w01% germanium and a quartz core doped with fluorine 30
A graded-index optical fiber consisting of a PPI-doped quartz cladding with an outer diameter of 125 gm was prepared, and the increase in optical transmission loss was investigated under the same conditions as described above, as shown in Figure 2 (E). , showed a loss increase of about 8 dB/Km after 40 minutes of radiation irradiation, and a large loss increase of about 10.5 dB/Km after 60 minutes of irradiation.
ところで、上述したように、石英コア１にゲルマニウム
の他にフッ素をドープすると、ゲルマニウムにフッ素が
結合し、ゲルマニウムを安定化するので、光フアイバ中
に拡散している水素がその後に０（酸素）と結びついて
ＯＨ基に変換する割合が減少する。従って、ＯＨ基の増
加による光吸収損失の増加も有効に防止することができ
る。By the way, as mentioned above, when the quartz core 1 is doped with fluorine in addition to germanium, the fluorine bonds to the germanium and stabilizes the germanium, so that the hydrogen diffused into the optical fiber becomes 0 (oxygen). The rate of conversion into OH groups decreases. Therefore, an increase in light absorption loss due to an increase in OH groups can also be effectively prevented.
第３図（Ａ）には本発明をＷ型のシングルモード光ファ
イバに応用した例が示されている。即ち、 この応用例
では１石英コア１上にフッ素が多量にドープされている
石英クラッド２が設けられ、このクラッド２上にはフッ
素が少量ドープされている石英層３が設けられ、更にそ
の上に石英管４がジャケットされている。そして、石英
コアｌにはゲルマニウム及びフッ素の両者がドープされ
ている。従って、この光ファイバの屈折率分布は、第３
図ＣＢ）に示すように１石英コアｌの屈折率が最も大き
く、石英クラッド２の屈折率が最も小さいＷ字状になる
。FIG. 3(A) shows an example in which the present invention is applied to a W-type single mode optical fiber. That is, in this application example, a quartz cladding 2 doped with a large amount of fluorine is provided on a quartz core 1, a quartz layer 3 doped with a small amount of fluorine is provided on the cladding 2, and a quartz layer 3 doped with a small amount of fluorine is provided on the cladding 2. A quartz tube 4 is jacketed inside. The quartz core l is doped with both germanium and fluorine. Therefore, the refractive index distribution of this optical fiber is
As shown in Figure CB), the refractive index of one quartz core l is the largest, and the refractive index of the quartz cladding 2 is the smallest, forming a W-shape.
このＷｙ！１シングルモード光ファイバは、帯域が広い
だけでなく、石英コアｌにフッ素がドープされているこ
とから、上述したように、放射線雰囲気中であっても紫
外域での吸収帯の増加が少なく、又ＯＨ基のその後に拒
する割合も小さい。This Wy! 1 Single mode optical fiber not only has a wide band, but also has a quartz core doped with fluorine, so as mentioned above, the absorption band in the ultraviolet region does not increase much even in a radiation atmosphere. Furthermore, the proportion of OH groups rejected afterwards is also small.
（発明の効果）
本発明によれば、ゲルマニウムがドープされている石英
コアにフッ素をドープしたことで、放射線照射によって
生じるゲルマニウムの構造欠陥等をフッ素により補償す
ることができる上にゲルマニウムをフッ素にて安定化し
、ファイバ中の水素のＯＨ基への変換を抑制することが
できる。従って、広帯域でありながら耐放射線特性に優
れ、かつ長期間に亘って安定的に光伝送を行うことがで
きる信頼性を有する石英系光ファイバを提供することが
できる。(Effects of the Invention) According to the present invention, by doping fluorine into a quartz core doped with germanium, structural defects of germanium caused by radiation irradiation can be compensated for by fluorine, and germanium can be replaced with fluorine. It is possible to stabilize the fiber by suppressing the conversion of hydrogen into OH groups in the fiber. Therefore, it is possible to provide a silica-based optical fiber that has a wide band, has excellent radiation resistance, and is reliable enough to stably transmit light over a long period of time.
第１図は本発明に係る石英系光ファイバの断面図、第２
図は放射線による光伝送損失増加の変化を示す特性図、
第３図（Ａ）及び（Ｂ）は本発明の応用例に係る石英系
光ファイバの断面図と屈折率分布図である。
１−−−−−一−−−石英コア、
２−−−−−−−−一石英クラッド、
３−−−−−−−−一石英層、
４−−−−−−−−一石英管。
第１図
第２図
照射時間 ＩＪＴ１１ｒｌｌFIG. 1 is a cross-sectional view of a silica-based optical fiber according to the present invention, and FIG.
The figure is a characteristic diagram showing changes in optical transmission loss increase due to radiation.
FIGS. 3A and 3B are a cross-sectional view and a refractive index distribution diagram of a silica-based optical fiber according to an applied example of the present invention. 1-------1 quartz core, 2----------1 quartz cladding, 3----------1 quartz layer, 4----------1 quartz tube. Figure 1 Figure 2 Irradiation time IJT11rll
Claims (1)
ア上に設けられ、フッ素がドープされている石英クラッ
ドとを有する石英系光ファイバであって、前記石英コア
にフッ素がドープされていることを特徴とする石英系光
ファイバ。A quartz-based optical fiber having a quartz core doped with germanium and a quartz cladding provided on the quartz core and doped with fluorine, characterized in that the quartz core is doped with fluorine. Silica-based optical fiber.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP59183483A JPS6163543A (en) | 1984-09-01 | 1984-09-01 | Quartz-based optical fiber |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP59183483A JPS6163543A (en) | 1984-09-01 | 1984-09-01 | Quartz-based optical fiber |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS6163543A true JPS6163543A (en) | 1986-04-01 |
Family
ID=16136597
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP59183483A Pending JPS6163543A (en) | 1984-09-01 | 1984-09-01 | Quartz-based optical fiber |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6163543A (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61222940A (en) * | 1985-03-29 | 1986-10-03 | Furukawa Electric Co Ltd:The | Optical fiber |
| JPH03247536A (en) * | 1990-02-27 | 1991-11-05 | Furukawa Electric Co Ltd:The | Entirely fluorine-doped optical fiber |
| JPH04349147A (en) * | 1991-05-22 | 1992-12-03 | Fujikura Ltd | Radiation-resistant optical fiber and its production |
| JPH06211544A (en) * | 1992-08-28 | 1994-08-02 | American Teleph & Telegr Co <Att> | System with doped optical fiber |
| CN110346866A (en) * | 2019-06-12 | 2019-10-18 | 烽火通信科技股份有限公司 | A kind of panda type polarization-preserving fiber |
| US20230020384A1 (en) * | 2021-07-01 | 2023-01-19 | Shin-Etsu Chemical Co., Ltd. | Optical fiber glass preform and method for manufacturing optical fiber glass preform |
-
1984
- 1984-09-01 JP JP59183483A patent/JPS6163543A/en active Pending
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61222940A (en) * | 1985-03-29 | 1986-10-03 | Furukawa Electric Co Ltd:The | Optical fiber |
| JPH03247536A (en) * | 1990-02-27 | 1991-11-05 | Furukawa Electric Co Ltd:The | Entirely fluorine-doped optical fiber |
| JPH04349147A (en) * | 1991-05-22 | 1992-12-03 | Fujikura Ltd | Radiation-resistant optical fiber and its production |
| JPH06211544A (en) * | 1992-08-28 | 1994-08-02 | American Teleph & Telegr Co <Att> | System with doped optical fiber |
| CN110346866A (en) * | 2019-06-12 | 2019-10-18 | 烽火通信科技股份有限公司 | A kind of panda type polarization-preserving fiber |
| CN110346866B (en) * | 2019-06-12 | 2020-08-25 | 烽火通信科技股份有限公司 | Panda type polarization maintaining optical fiber |
| US20230020384A1 (en) * | 2021-07-01 | 2023-01-19 | Shin-Etsu Chemical Co., Ltd. | Optical fiber glass preform and method for manufacturing optical fiber glass preform |
| US11680007B2 (en) * | 2021-07-01 | 2023-06-20 | Shin-Etsu Chemical Co., Ltd. | Optical fiber glass preform and method for manufacturing optical fiber glass preform |
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