JPS612104A - Optical fiber cable - Google Patents
Optical fiber cableInfo
- Publication number
- JPS612104A JPS612104A JP59122732A JP12273284A JPS612104A JP S612104 A JPS612104 A JP S612104A JP 59122732 A JP59122732 A JP 59122732A JP 12273284 A JP12273284 A JP 12273284A JP S612104 A JPS612104 A JP S612104A
- Authority
- JP
- Japan
- Prior art keywords
- optical fiber
- monitoring
- signal transmission
- cutting
- parallel
- 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
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
- G02B6/443—Protective covering
- G02B6/4431—Protective covering with provision in the protective covering, e.g. weak line, for gaining access to one or more fibres, e.g. for branching or tapping
-
- 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
- G02B6/4439—Auxiliary devices
- G02B6/4469—Security aspects
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Engineering & Computer Science (AREA)
- Computer Security & Cryptography (AREA)
- Light Guides In General And Applications Therefor (AREA)
- Optical Fibers, Optical Fiber Cores, And Optical Fiber Bundles (AREA)
- Testing Of Optical Devices Or Fibers (AREA)
Abstract
Description
【発明の詳細な説明】
ta) 発明の技術分野
本発明は光ファイバケーブルに係り、特に盗聴防止用の
光ファイバケーブルに関する。DETAILED DESCRIPTION OF THE INVENTION ta) Technical Field of the Invention The present invention relates to an optical fiber cable, and more particularly to an optical fiber cable for preventing eavesdropping.
(b) 技術の背景
近年光ファイバケーブルの普及は目覚ましく、重要回線
にも利用されるようになってきた。従って、とくに重要
回線については盗聴にたいする完全な防止手段の開発が
望まれている。(b) Background of the technology In recent years, optical fiber cables have become widespread and are now being used for important lines. Therefore, it is desired to develop a complete means to prevent eavesdropping, especially for important lines.
(C1従来技術と問題点
従来、このような光ファイバケーブルの盗聴を防止する
手段として、信号伝送用光ファイバの周囲に複数本の監
視用光ファイバを平行に埋設したものが提案されていた
が、光ファイバケーブルの長手方向にケーブル外皮を切
裂けば、監視用光ファイバを切断することなく信号伝送
用光ファイバを摘出して漏光をキャッチできるので、盗
聴を完全に防止できないという欠点があった。(C1 Prior Art and Problems Conventionally, as a means to prevent such eavesdropping on optical fiber cables, it has been proposed to bury multiple monitoring optical fibers in parallel around the signal transmission optical fiber. However, by cutting the cable jacket in the longitudinal direction of the optical fiber cable, the signal transmission optical fiber can be extracted and light leakage can be detected without cutting the monitoring optical fiber, but this method had the disadvantage that eavesdropping could not be completely prevented. .
(dl 発明の目的
本発明は上記従来の欠点に鑑み、信号伝送用光ファイバ
の摘出が、監視用光ファイバの破損無しに成し得ない構
造にすることにより、盗聴に伴う光ファイバケーブルの
破損、被覆部分の切断を監視可能な光ファイバケーブル
の提供を目的とする。(dl Purpose of the Invention In view of the above-mentioned drawbacks of the conventional art, the present invention provides a structure in which the signal transmission optical fiber cannot be removed without damaging the monitoring optical fiber. The purpose of the present invention is to provide an optical fiber cable that can monitor cutting of the coated portion.
(el 発明の構成
そしてこの目的は、信号伝送用光ファイバの周囲に被覆
を施してなる光ファイバケーブルにおいて、前記被覆内
に前記信号伝送用光ファイバと平行する複数の監視用平
行光ファイバと、螺旋状に巻かれた監視用螺旋光ファイ
バとを埋設して成ることを特徴とする本発明の光ファイ
バケーブルを提供することにより達成される。(el) The structure and object of the invention is to provide an optical fiber cable in which a signal transmission optical fiber is coated around the signal transmission optical fiber, and a plurality of monitoring parallel optical fibers that are parallel to the signal transmission optical fiber within the coating; This is achieved by providing the optical fiber cable of the present invention, which is characterized in that it is embedded with a spirally wound monitoring spiral optical fiber.
(f) 発明の実施例 以下本発明の実施例を図面によって詳述する。(f) Examples of the invention Embodiments of the present invention will be described in detail below with reference to the drawings.
第1図は本発明による光ファイバケーブルの側面図、第
2図は第1図の断面図を示す。FIG. 1 shows a side view of an optical fiber cable according to the invention, and FIG. 2 shows a sectional view of FIG. 1.
図において、信号伝送用の光ファイノX1の周囲は合成
樹脂等にてなる被覆材2にて被覆されており、この被覆
材2には光ファイバ1と平行する複数の監視用平行光フ
ァイバ3と、螺旋状に巻かれた別の複数の監視用螺旋光
ファイバ4とが埋設された構造になっている。In the figure, the periphery of an optical fiber X1 for signal transmission is covered with a covering material 2 made of synthetic resin, etc., and this covering material 2 includes a plurality of parallel optical fibers 3 for monitoring parallel to the optical fiber 1. , and another plurality of spirally wound monitoring spiral optical fibers 4 are buried therein.
信号伝送用光ファイバ1には、本来の目的である情報光
信号を通し、複数の監視用平行光ファイバ3と監視用螺
旋光ファイバ4にはそれぞれ受信端が一定レベルとなる
安定な監視用光信号を通ず。The optical fiber 1 for signal transmission passes the information optical signal, which is the original purpose, and the parallel optical fibers 3 for monitoring and the spiral optical fiber 4 for monitoring each carry stable monitoring light whose receiving end is at a constant level. Pass the signal.
受信側では監視用平行光ファイバ3と監視用螺旋光ファ
イバ4のそれぞれの受光レベルを常時監視し、受光レベ
ルの低下を検出することにより監視用の光ファイバが切
断され、信号伝送用光ファイバ1の情報光信号が盗聴さ
れ始めたことを知ることができる。On the receiving side, the light reception level of each of the monitoring parallel optical fiber 3 and the monitoring spiral optical fiber 4 is constantly monitored, and when a decrease in the light reception level is detected, the monitoring optical fiber is cut, and the signal transmission optical fiber 1 is cut. It is possible to know that the information optical signals of
第1図と第2図とから分かるように、監視用平行光ファ
イバ3と監視用螺旋光ファイバ4とは信号伝送用光ファ
イバ1に対して縦横に配置されているので、信号伝送用
光ファイバlの情報光信号を盗聴しようとすれば、監視
用平行光ファイバ3と監視用螺旋光ファイバ4とのどち
らかを、或いは両方を必ず切断しなければならない。そ
の切断により前述のように信号伝送用光ファイバ1の情
報光信号が盗聴され始めたことを知ることができる。As can be seen from FIGS. 1 and 2, the monitoring parallel optical fiber 3 and the monitoring spiral optical fiber 4 are arranged vertically and horizontally with respect to the signal transmission optical fiber 1. In order to eavesdrop on the information optical signal of 1, either or both of the monitoring parallel optical fiber 3 and the monitoring spiral optical fiber 4 must be cut. By the disconnection, it can be known that the information optical signal of the signal transmission optical fiber 1 has begun to be tapped, as described above.
なお、図において信号伝送用光ファイバ1は1本の場合
について説明したが、本発明は多芯ケーブルの場合にも
適用可能なことはいうまでもない。In addition, although the case where the number of signal transmission optical fibers 1 is one is explained in the figure, it goes without saying that the present invention is also applicable to the case of a multi-core cable.
(gl 発明の効果
以上詳細に説明したように本発明の光ファイバケーブル
の構造によれば、信号伝送用光ファイバの露出に際して
必ず監視用光ファイバの切断を伴うので、確実に盗聴を
防止することが可能となる。(gl Effects of the Invention As explained in detail above, according to the structure of the optical fiber cable of the present invention, the monitoring optical fiber is always cut when the signal transmission optical fiber is exposed, so wiretapping can be reliably prevented. becomes possible.
第1図は本発明による光ファイバケーブルの側面図、第
2図は第1図の断面図を示す。
図において、1は信号伝送用の光ファイバ、2は被覆材
、3は監視用平行光ファ・イバ、4は監視用螺旋光ファ
イバを示す。
第1図
第2図FIG. 1 shows a side view of an optical fiber cable according to the invention, and FIG. 2 shows a sectional view of FIG. 1. In the figure, 1 is an optical fiber for signal transmission, 2 is a coating material, 3 is a parallel optical fiber for monitoring, and 4 is a spiral optical fiber for monitoring. Figure 1 Figure 2
Claims (1)
イバケーブルにおいて、前記被覆内に前記信号伝送用光
ファイバと平行する複数の監視用平行光ファイバと、螺
旋状に巻かれた監視用螺旋光ファイバとを埋設して成る
ことを特徴とする光ファイバケーブル。An optical fiber cable comprising a signal transmission optical fiber coated around the signal transmission optical fiber, the coating including a plurality of monitoring parallel optical fibers parallel to the signal transmission optical fiber, and a monitoring spiral light wound in a spiral. An optical fiber cable characterized by being formed by burying a fiber.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP59122732A JPS612104A (en) | 1984-06-13 | 1984-06-13 | Optical fiber cable |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP59122732A JPS612104A (en) | 1984-06-13 | 1984-06-13 | Optical fiber cable |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS612104A true JPS612104A (en) | 1986-01-08 |
Family
ID=14843212
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP59122732A Pending JPS612104A (en) | 1984-06-13 | 1984-06-13 | Optical fiber cable |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS612104A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1591816A1 (en) * | 2004-04-28 | 2005-11-02 | Corning Incorporated | Cables and cable installations |
JP2014106380A (en) * | 2012-11-28 | 2014-06-09 | Fujikura Ltd | Optical fiber cable, and manufacturing method and manufacturing device thereof |
-
1984
- 1984-06-13 JP JP59122732A patent/JPS612104A/en active Pending
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1591816A1 (en) * | 2004-04-28 | 2005-11-02 | Corning Incorporated | Cables and cable installations |
JP2014106380A (en) * | 2012-11-28 | 2014-06-09 | Fujikura Ltd | Optical fiber cable, and manufacturing method and manufacturing device thereof |
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