JPS6232408A - fiber optic cable - Google Patents

fiber optic cable

Info

Publication number
JPS6232408A
JPS6232408A JP60172205A JP17220585A JPS6232408A JP S6232408 A JPS6232408 A JP S6232408A JP 60172205 A JP60172205 A JP 60172205A JP 17220585 A JP17220585 A JP 17220585A JP S6232408 A JPS6232408 A JP S6232408A
Authority
JP
Japan
Prior art keywords
optical fiber
hydrogen
hydrogen storage
cable
storage alloy
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
Application number
JP60172205A
Other languages
Japanese (ja)
Inventor
Shigeru Tomita
茂 冨田
Hiromichi Shinohara
篠原　弘道
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
NTT Inc
Original Assignee
Nippon Telegraph and Telephone Corp
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Nippon Telegraph and Telephone Corp filed Critical Nippon Telegraph and Telephone Corp
Priority to JP60172205A priority Critical patent/JPS6232408A/en
Publication of JPS6232408A publication Critical patent/JPS6232408A/en
Pending legal-status Critical Current

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
    • G02B6/44—Mechanical structures for providing tensile strength and external protection for fibres, e.g. optical transmission cables
    • G02B6/4401—Optical cables
    • G02B6/4429—Means specially adapted for strengthening or protecting the cables
    • G02B6/44382—Means specially adapted for strengthening or protecting the cables the means comprising hydrogen absorbing materials

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)

Abstract

PURPOSE:To prevent the degradation in transmission characteristic of an optical fiber due to gaseous hydrogen by allowing a cable constituting member to contain a metallic alloy for hydrogen storage. CONSTITUTION:The optical fiber cable consists of an optical fiber 1, a core material 2, a buffer layer 3 where a powdery metallic alloy for hydrogen storage is mixed, and a cable housing 4. The metallic alloy for hydrogen storage whose equilibrium hydrogen pressure is <=0.1atm. is powdered and is mixed in a buffer material. Even if gaseous hydrogen is generated, the gaseous hydrogen pressure in the optical fiber cable is kept <=0.1atm. to hold down the increase of the light transmission loss of the optical fiber to <=0.05(bB/km).

Description

【発明の詳細な説明】 （技術分野） 本発明は、水素ガスによる光ファイバの光伝送損失増加
を抑制する光ファイバケーブルに関するものである。DETAILED DESCRIPTION OF THE INVENTION (Technical Field) The present invention relates to an optical fiber cable that suppresses an increase in optical transmission loss of an optical fiber due to hydrogen gas.

（従来の技術） 従来の光ファイバケーブルでは、ケーブル内の水素ガス
発生に対する対策がとられていない。(Prior Art) Conventional optical fiber cables do not take measures against hydrogen gas generation within the cable.

（発明が解決しようとする問題点） 光ファイバケーブル内に水素ガスが発生し、この水素ガ
スが光フアイバ内に侵入すると、水素分子による光吸収
が起こり、光伝送損失が増加することが知られている。(Problem to be solved by the invention) It is known that when hydrogen gas is generated within an optical fiber cable and this hydrogen gas enters the optical fiber, light absorption by hydrogen molecules occurs and optical transmission loss increases. ing.

したがつ（、水素の発生に伴って、従来の光ファイバケ
ーブルでは伝送特性が劣化するという欠点があった。However, conventional optical fiber cables had the disadvantage that their transmission characteristics deteriorated due to the generation of hydrogen.

（発明の目的） 本発明の目的は、水素ガスによる光ファイバの伝送特性
劣化を防ぐことができる光ファイバケーブルを提供する
ことにある。(Object of the Invention) An object of the present invention is to provide an optical fiber cable that can prevent transmission characteristics of an optical fiber from deteriorating due to hydrogen gas.

（問題点を解決するための手段） 本発明は上記問題点を解決するため、ケーブル層成部材
に水素吸蔵合金を含むようにした。(Means for Solving the Problems) In order to solve the above problems, the present invention includes a cable layered member containing a hydrogen storage alloy.

（作用） 本発明によれば、ケーブル構成部材に水素吸蔵合金を含
むので、ケーブル内の水素分圧を一定６以下に抑えられ
る。(Function) According to the present invention, since the cable component includes a hydrogen storage alloy, the hydrogen partial pressure within the cable can be suppressed to a constant value of 6 or less.

（実施例） 第１図は、本発明の第１の実施例を示す光ファイバケー
ブルの断面図であって、１は光ファイバ、２は中心材、
３は粉末状の水素吸蔵合金を混入した緩衝層、４はケー
ブル外被である。(Embodiment) FIG. 1 is a sectional view of an optical fiber cable showing a first embodiment of the present invention, in which 1 is an optical fiber, 2 is a core material,
3 is a buffer layer mixed with a powdered hydrogen storage alloy, and 4 is a cable jacket.

まず、水素吸蔵合金の一般的な特性について第２図を用
いて説明づ゛る。該合金の雰囲気の水素ガス圧力が一定
値（平衡水素圧）以上になると、急激に水素を吸蔵する
。この吸蔵は、合金内の水素が飽和量になるまで続くた
め、その間雰囲気の水素ガス圧力はほぼ平衡水素圧のま
ま保たれる。また水素の飽和量は、該合金との重山比で
数％であり、かなり大量の水素を吸蔵することが可能で
ある。First, the general characteristics of hydrogen storage alloys will be explained using FIG. 2. When the hydrogen gas pressure in the atmosphere of the alloy exceeds a certain value (equilibrium hydrogen pressure), hydrogen is rapidly absorbed. This occlusion continues until the hydrogen in the alloy reaches a saturated amount, so the hydrogen gas pressure in the atmosphere is maintained at approximately the equilibrium hydrogen pressure during that time. Moreover, the saturated amount of hydrogen is several percent in weight ratio with the alloy, and it is possible to store a considerably large amount of hydrogen.

第３図は、雰囲気の水素ガス圧力に対する光ファイバの
損失増加量を示したものである。同図がら光ファイバの
損失増加量を０．０．５　（ｄＢ／ｋｍ）以下に抑える
ためには、雰囲気の水素ガス圧力を０．１気圧以下にす
ればよいことがわかる。FIG. 3 shows the amount of increase in optical fiber loss with respect to the hydrogen gas pressure in the atmosphere. It can be seen from the figure that in order to suppress the increase in optical fiber loss to 0.0.5 (dB/km) or less, the hydrogen gas pressure in the atmosphere should be set to 0.1 atmosphere or less.

そこで、平衡水素圧が０．１気圧以下であるような水素
吸蔵合金を粉末状にして、緩衝材に混入することにより
、水素ガスが発生しても、光ファイバケーブル内の水素
ガス圧力を０．１気圧以下に保つことができ、光ファイ
バの光伝送損失増加量を０．０５　（ｄＢ／ｋｍ）以下
に抑えられる。Therefore, by powdering a hydrogen storage alloy with an equilibrium hydrogen pressure of 0.1 atmosphere or less and mixing it into the buffer material, even if hydrogen gas is generated, the hydrogen gas pressure inside the optical fiber cable can be reduced to zero. .1 atmosphere or less, and the increase in optical transmission loss of the optical fiber can be suppressed to 0.05 (dB/km) or less.

第４図は、水素吸蔵合金の例で、平衡水素圧を示してい
る。平衡水素圧は、温度により変化するが、２０°Ｃ付
近で０．１気圧以下の平衡水素圧を持つ合金の例として
ＬａＣｏ３がある。またＬａＣｏ３は合金の一例であり
、これ以外の合金でも上記の条件を満たすものであれば
使用可能である。FIG. 4 shows an example of a hydrogen storage alloy and shows the equilibrium hydrogen pressure. Although the equilibrium hydrogen pressure changes depending on the temperature, LaCo3 is an example of an alloy that has an equilibrium hydrogen pressure of 0.1 atm or less around 20°C. Further, LaCo3 is an example of an alloy, and other alloys can be used as long as they satisfy the above conditions.

このように緩衝材に水素吸蔵合金を混入することで、光
ファイバケーブル内の水素ガス圧力を一定値以下に抑え
、水素ガスによる光ファイバの逼失増加を防ぐことがで
きる。By mixing the hydrogen storage alloy into the buffer material in this manner, it is possible to suppress the hydrogen gas pressure within the optical fiber cable to a certain value or less, and prevent increased loss of optical fibers due to hydrogen gas.

第５図は本発明の第２の実施例を示ず光ファイバケーブ
ルの断面図であり、１は光ファイバ、５は粉末状の水素
吸蔵合金よりなる層で、中心材２の表面に接着される。FIG. 5 shows a second embodiment of the present invention and is a sectional view of an optical fiber cable, in which 1 is an optical fiber, and 5 is a layer made of a powdered hydrogen storage alloy, which is bonded to the surface of the core material 2. Ru.

４はケーブル外被である。4 is a cable jacket.

その他の構成は第１の実施例と同様であり、水素ガスに
よる光ファイバの光伝送損失増加を防ぐ機構は第１の実
施例と同様である。The rest of the configuration is the same as that of the first embodiment, and the mechanism for preventing an increase in optical transmission loss of the optical fiber due to hydrogen gas is the same as that of the first embodiment.

第６図は本発明の第３の実施例を示す光ファイバケーブ
ルの断面図であり、１は光ファイバ、２は中心材、３は
緩衝材、４はケーブル外被、７は粉末状の水素吸蔵合金
を内表面に接着したラミネートテープで、ケーブル外被
４の内側に水素吸蔵合金が内側になる如く被着される。FIG. 6 is a sectional view of an optical fiber cable showing a third embodiment of the present invention, in which 1 is an optical fiber, 2 is a core material, 3 is a buffer material, 4 is a cable jacket, and 7 is a powdered hydrogen A laminate tape with a hydrogen storage alloy adhered to the inner surface is applied to the inside of the cable jacket 4 with the hydrogen storage alloy on the inside.

水素ガスによる光ファイバの損失増加を防ぐ機構は、第
１の実施例と同様である。The mechanism for preventing an increase in optical fiber loss due to hydrogen gas is the same as in the first embodiment.

（発明の効果） 以上説明したように本発明によれば、ケーブル構成部材
に水素吸蔵合金を含むので、水素吸蔵合金によってケー
ブル内の水素圧力を一定値以下に保ち、光ファイバの光
損失増加を防ぐことができ、安定した伝送特性が保証で
きる利点がある。(Effects of the Invention) As explained above, according to the present invention, since the cable component includes a hydrogen storage alloy, the hydrogen storage alloy maintains the hydrogen pressure within the cable below a certain value, thereby reducing the increase in optical loss of the optical fiber. This has the advantage that stable transmission characteristics can be guaranteed.

【図面の簡単な説明】[Brief explanation of the drawing]

第１図は本発明の第１の実施例を示す光ファイバケーブ
ルの断面図、第２図は水素吸蔵合金における雰囲気の水
素ガス圧力に対する水素吸蔵量を示す特性図、第３図は
光ファイバの雰囲気水素ガス圧力に対する光損失増加量
を示す図、第４図は水素吸蔵合金の特性図、第５図は本
発明の第２の実施例を示す光ファイバケーブルの断面図
、第６図は本発明の第３の実施例を示す光ファイバケー
ブルの断面図である。 １・・・光ファイバ、２・・・中心材、３・・・緩衝材
、４・・・ケーブル外被、５・・・粉末状の水素吸蔵合
金接着層、６・・・水素吸蔵合金を内表面に接着したラ
ミネートテープFIG. 1 is a cross-sectional view of an optical fiber cable showing the first embodiment of the present invention, FIG. 2 is a characteristic diagram showing the amount of hydrogen absorbed by hydrogen gas pressure in the atmosphere in a hydrogen storage alloy, and FIG. FIG. 4 is a characteristic diagram of a hydrogen storage alloy, FIG. 5 is a cross-sectional view of an optical fiber cable showing the second embodiment of the present invention, and FIG. 6 is a diagram showing the optical loss increase with respect to atmospheric hydrogen gas pressure. FIG. 7 is a cross-sectional view of an optical fiber cable showing a third embodiment of the invention. DESCRIPTION OF SYMBOLS 1... Optical fiber, 2... Core material, 3... Buffer material, 4... Cable jacket, 5... Powdered hydrogen storage alloy adhesive layer, 6... Hydrogen storage alloy Laminated tape adhered to inner surface

Claims (4)

【特許請求の範囲】[Claims] （１）ケーブル構成部材に水素吸蔵合金を含むことを特
徴とする光ファイバケーブル。(1) An optical fiber cable characterized in that a cable component contains a hydrogen storage alloy. （２）中心材にまわりに数本の光ファイバを撚り合わせ
、その周囲に粉末状の水素吸蔵合金を混入した緩衝層を
配し、その周囲を外被で覆つたことを特徴とする特許請
求の範囲第１項記載の光ファイバケーブル。(2) A patent claim characterized in that several optical fibers are twisted around a core material, a buffer layer containing a powdered hydrogen storage alloy is arranged around it, and the periphery is covered with an outer jacket. The optical fiber cable according to item 1. （３）水素吸蔵合金を混入した中心材のまわりに数本の
光ファイバを撚り合わせ、その周囲を外被で覆つたこと
を特徴とする特許請求の範囲第１項記載の光ファイバケ
ーブル。(3) The optical fiber cable according to claim 1, characterized in that several optical fibers are twisted around a core material mixed with a hydrogen storage alloy, and the periphery thereof is covered with an outer sheath. （４）中心材のまわりに数本の光ファイバを撚り合わせ
、その周囲を水素吸蔵合金を混入したラミネート外被で
覆ったことを特徴とする特許請求の範囲第１項記載の光
ファイバケーブル。(4) The optical fiber cable according to claim 1, characterized in that several optical fibers are twisted together around a core material, and the periphery thereof is covered with a laminate jacket mixed with a hydrogen storage alloy.
JP60172205A 1985-08-05 1985-08-05 fiber optic cable Pending JPS6232408A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP60172205A JPS6232408A (en) 1985-08-05 1985-08-05 fiber optic cable

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP60172205A JPS6232408A (en) 1985-08-05 1985-08-05 fiber optic cable

Publications (1)

Publication Number Publication Date
JPS6232408A true JPS6232408A (en) 1987-02-12

Family

ID=15937532

Family Applications (1)

Application Number Title Priority Date Filing Date
JP60172205A Pending JPS6232408A (en) 1985-08-05 1985-08-05 fiber optic cable

Country Status (1)

Country Link
JP (1) JPS6232408A (en)

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