JPH0250063B2 - - Google Patents
Info
- Publication number
- JPH0250063B2 JPH0250063B2 JP57008646A JP864682A JPH0250063B2 JP H0250063 B2 JPH0250063 B2 JP H0250063B2 JP 57008646 A JP57008646 A JP 57008646A JP 864682 A JP864682 A JP 864682A JP H0250063 B2 JPH0250063 B2 JP H0250063B2
- Authority
- JP
- Japan
- Prior art keywords
- radiation
- optical fiber
- groups
- core
- radiation resistance
- 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 - Lifetime
Links
- 230000005855 radiation Effects 0.000 claims description 16
- 239000013307 optical fiber Substances 0.000 claims description 15
- 125000002887 hydroxy group Chemical group [H]O* 0.000 claims description 14
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 6
- 238000005253 cladding Methods 0.000 claims description 5
- PXGOKWXKJXAPGV-UHFFFAOYSA-N Fluorine Chemical compound FF PXGOKWXKJXAPGV-UHFFFAOYSA-N 0.000 claims description 4
- 229910052731 fluorine Inorganic materials 0.000 claims description 4
- 239000011737 fluorine Substances 0.000 claims description 4
- ZOXJGFHDIHLPTG-UHFFFAOYSA-N Boron Chemical compound [B] ZOXJGFHDIHLPTG-UHFFFAOYSA-N 0.000 claims description 2
- ZAMOUSCENKQFHK-UHFFFAOYSA-N Chlorine atom Chemical compound [Cl] ZAMOUSCENKQFHK-UHFFFAOYSA-N 0.000 claims description 2
- 229910052796 boron Inorganic materials 0.000 claims description 2
- 229910052801 chlorine Inorganic materials 0.000 claims description 2
- 239000000460 chlorine Substances 0.000 claims description 2
- 230000005540 biological transmission Effects 0.000 description 2
- 230000007423 decrease Effects 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 235000012239 silicon dioxide Nutrition 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)
- General Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Optics & Photonics (AREA)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Physics & Mathematics (AREA)
- Geochemistry & Mineralogy (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Optical Fibers, Optical Fiber Cores, And Optical Fiber Bundles (AREA)
- Surface Treatment Of Glass Fibres Or Filaments (AREA)
- Glass Compositions (AREA)
Description
本発明は放射線環境下で用いられる耐放射線光
フアイバに関する。
放射線の影響によつて光フアイバの伝送損失が
増大することは既に知られているところである。
既知の通り純粋な石英ガラスをコアとした光フ
アイバは耐放射線特性に優れているが、さらに優
れた特性を得るべく実験、研究が進められてい
る。
その結果として高純度の石英ガラスコアにOH
基を添加することによりさらに優れた特性が得ら
れることが明らかになつている。
そこで次に問題となるのがOH基の含有量が光
フアイバの伝送損失に及ぼす影響である。
OH濃度2ppmの光フアイバＡと80ppmの光フ
アイバＢにγ線を1Mrad（放射線の線量）照射し
た。
この時の損失増加量を表に示す。
表からわかるように、Ａ、Ｂを比較した場合、
光フアイバＢの方が明らかに少ない。
The present invention relates to radiation-resistant optical fibers used in radiation environments. It is already known that the transmission loss of optical fibers increases due to the influence of radiation. As is known, optical fibers with pure silica glass as their core have excellent radiation resistance properties, but experiments and research are underway to obtain even better properties. As a result of the high purity silica glass core OH
It has become clear that even better properties can be obtained by adding groups. Therefore, the next issue is the effect that the OH group content has on the transmission loss of the optical fiber. Optical fiber A with an OH concentration of 2 ppm and optical fiber B with an OH concentration of 80 ppm were irradiated with γ-rays at a dose of 1 Mrad (radiation dose). The amount of loss increase at this time is shown in the table. As you can see from the table, when comparing A and B,
Optical fiber B is clearly smaller.
【表】
このことよりOH基の含有量を増大させれば耐
放射線特性が改善されるということがわかる反
面、80ppm程度では改善の度合が顕著でないとい
うことも明らかになつた。
この程度の改善では高線量率の放射線を受けた
場合、かなりの損失増が生じることが予想され
る。
本発明は石英ガラスからなるコアにある量の
OH基を添加することによつて光フアイバの耐放
射線特性を向上させようというもので、これを図
面に示す実施例を参照しながら説明すると、第２
図において１はOH基が添加された石英ガラスの
コア、２はクラツドであり、OH基濃度を違えて
同様の構造の光フアイバを所定数作製し、これら
にγ線を照射線量率1Mrad／ｈで照射して損失
増を調べたところ、著しく優れた耐放射線特性を
示すOH基濃度範囲の存することが明らかになつ
た。
そこで照射線量を5Mradに設定してより厳密
に実験を重ねたところ、第３図に示すような結果
が得られた。
同図において縦軸は損失増加量α（dB／Km）、
横軸はOH基の濃度ρ（ppm）を表わしている。
同図からわかるようにOH基濃度が1000ppm以
上になると損失増加量αが急激に減少しており、
このことは耐放射線特性の著しい向上を示すもの
である。
したがつて耐放射線特性を向上させるうえで、
OH基濃度1000ppmという値は重要な指標とな
る。
このようにOH基濃度の増大は耐放射線特性の
向上をもたらすのであるが、他面光フアイバの強
度劣化をもたらすものであるということも充分に
考慮されなければならない。
そこでOH基濃度の上限が数％に設定されるこ
とになる。
なお、耐放射線特性の向上に、より一層寄与す
るものとしてフツ素、塩素があり、コア１にOH
基の他、これらのうち一方または両方を添加する
とより特性が向上することになる。
またクラツド２としては、ホウ素またはフツ素
が添加されたもの、あるいはプラスチツククラツ
ド等が好ましい。
以上のように本発明においては高純度の石英ガ
ラスからなるコアに0.1〜数％のOH基を添加する
ことにより耐放射線特性を飛躍的に向上させたの
で、高線量率の放射線場にあつても損失の増大が
それ程みられない光フアイバが得られることにな
る。[Table] This shows that increasing the content of OH groups improves the radiation resistance properties, but it also becomes clear that the degree of improvement is not significant at around 80 ppm. This level of improvement is expected to result in a significant increase in loss when exposed to high dose rate radiation. The present invention provides a core made of quartz glass with a certain amount of
The idea is to improve the radiation resistance of optical fibers by adding OH groups, and this will be explained with reference to the examples shown in the drawings.
In the figure, 1 is a core of silica glass doped with OH groups, and 2 is a cladding.A predetermined number of optical fibers with a similar structure with different OH group concentrations were fabricated, and these were irradiated with γ-rays at a dose rate of 1 Mrad/h. When the loss increase was investigated by irradiation with Therefore, when we conducted more rigorous experiments by setting the irradiation dose to 5 Mrad, we obtained the results shown in Figure 3. In the same figure, the vertical axis is the loss increase α (dB/Km),
The horizontal axis represents the concentration ρ (ppm) of OH groups. As can be seen from the figure, when the OH group concentration exceeds 1000 ppm, the loss increase amount α decreases rapidly.
This shows a significant improvement in radiation resistance. Therefore, in order to improve radiation resistance,
The value of 1000 ppm OH group concentration is an important indicator. In this way, an increase in the OH group concentration brings about an improvement in radiation resistance, but it must also be fully taken into consideration that it also brings about a deterioration in the strength of the optical fiber. Therefore, the upper limit of the OH group concentration is set at several percent. In addition, there are fluorine and chlorine that contribute even more to the improvement of radiation resistance characteristics, and OH in core 1.
If one or both of these groups are added in addition to the group, the properties will be further improved. The cladding 2 is preferably one to which boron or fluorine is added, or a plastic cladding. As described above, in the present invention, radiation resistance has been dramatically improved by adding 0.1 to several percent of OH groups to the core made of high-purity quartz glass. Therefore, it is possible to obtain an optical fiber in which the loss does not increase significantly.
第１図はOH基を添加した構造の光フアイバの
断面図、第２図は損失増とOH基濃度との関係を
示すグラフである。
１……コア、２……クラツド。
FIG. 1 is a cross-sectional view of an optical fiber having a structure doped with OH groups, and FIG. 2 is a graph showing the relationship between loss increase and OH group concentration. 1... Core, 2... Clad.
Claims (1)
ガラスからなるコアを有していることを特徴とす
る耐放射線光フアイバ。 ２ コアにはフツ素と塩素の何れか一方または両
方が添加されていることを特徴とする特許請求の
範囲第１項記載の耐放射線光フアイバ。 ３ ホウ素またはフツ素が添加されたクラツドま
たはプラスチツククラツドを有することを特徴と
する特許請求の範囲第１項または第２項記載の耐
放射線光フアイバ。[Scope of Claims] 1. A radiation-resistant optical fiber characterized by having a core made of high-purity quartz glass doped with 0.1 to several percent of OH groups. 2. The radiation-resistant optical fiber according to claim 1, wherein one or both of fluorine and chlorine is added to the core. 3. The radiation-resistant optical fiber according to claim 1 or 2, characterized in that it has a cladding or a plastic cladding doped with boron or fluorine.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP57008646A JPS58125635A (en) | 1982-01-22 | 1982-01-22 | Radiation-resistant optical fiber |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP57008646A JPS58125635A (en) | 1982-01-22 | 1982-01-22 | Radiation-resistant optical fiber |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS58125635A JPS58125635A (en) | 1983-07-26 |
| JPH0250063B2 true JPH0250063B2 (en) | 1990-11-01 |
Family
ID=11698704
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP57008646A Granted JPS58125635A (en) | 1982-01-22 | 1982-01-22 | Radiation-resistant optical fiber |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS58125635A (en) |
Families Citing this family (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS60255646A (en) * | 1983-06-27 | 1985-12-17 | Furukawa Electric Co Ltd:The | Optical fiber of quartz |
| JPS6051505U (en) * | 1983-09-17 | 1985-04-11 | 三菱電線工業株式会社 | image guide |
| JPS60257408A (en) * | 1984-06-04 | 1985-12-19 | Shin Etsu Chem Co Ltd | Optical fiber and its production |
| US4822136A (en) * | 1984-06-15 | 1989-04-18 | Polaroid Corporation | Single mode optical fiber |
| JPS6153132A (en) * | 1984-08-18 | 1986-03-17 | Dainichi Nippon Cables Ltd | Preform of radiation-resistant optical fiber |
| JPH01167258A (en) * | 1987-12-23 | 1989-06-30 | Shinetsu Sekiei Kk | Element assembly of laser optical system |
| JPH035338A (en) * | 1989-05-30 | 1991-01-11 | Shinetsu Sekiei Kk | Optical member for laser light |
| US5325230A (en) * | 1989-06-09 | 1994-06-28 | Shin-Etsu Quartz Products Co., Ltd. | Optical members and blanks of synthetic silica glass and method for their production |
| EP0401845B2 (en) * | 1989-06-09 | 2001-04-11 | Heraeus Quarzglas GmbH & Co. KG | Optical members and blanks of synthetic silica glass and method for their production |
| JPH04362040A (en) * | 1991-06-07 | 1992-12-15 | Fujikura Ltd | Image fiber |
| JP4699267B2 (en) | 2006-04-14 | 2011-06-08 | 株式会社フジクラ | Radiation-resistant optical fiber and manufacturing method thereof |
-
1982
- 1982-01-22 JP JP57008646A patent/JPS58125635A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS58125635A (en) | 1983-07-26 |
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