JPS59232302A - 光伝送用フアイバ - Google Patents

光伝送用フアイバ

Info

Publication number
JPS59232302A
JPS59232302A JP58107354A JP10735483A JPS59232302A JP S59232302 A JPS59232302 A JP S59232302A JP 58107354 A JP58107354 A JP 58107354A JP 10735483 A JP10735483 A JP 10735483A JP S59232302 A JPS59232302 A JP S59232302A
Authority
JP
Japan
Prior art keywords
refractive index
clad layer
cladding layer
optical transmission
core part
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
JP58107354A
Other languages
English (en)
Inventor
Masayuki Nishimura
正幸 西村
Shuzo Suzuki
鈴木　修三
Hiroshi Yokota
弘 横田
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.)
Sumitomo Electric Industries Ltd
NTT Inc
Original Assignee
Nippon Telegraph and Telephone Corp
Sumitomo Electric Industries Ltd
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, Sumitomo Electric Industries Ltd filed Critical Nippon Telegraph and Telephone Corp
Priority to JP58107354A priority Critical patent/JPS59232302A/ja
Priority to US06/599,023 priority patent/US4715695A/en
Priority to CA000451982A priority patent/CA1251965A/en
Priority to DK195084A priority patent/DK158027C/da
Priority to AU26874/84A priority patent/AU561707B2/en
Priority to EP84106229A priority patent/EP0131729B1/en
Priority to DE8484106229T priority patent/DE3470961D1/de
Publication of JPS59232302A publication Critical patent/JPS59232302A/ja
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
    • G02B6/02—Optical fibres with cladding with or without a coating
    • G02B6/036—Optical fibres with cladding with or without a coating core or cladding comprising multiple layers
    • G02B6/03616—Optical fibres characterised both by the number of different refractive index layers around the central core segment, i.e. around the innermost high index core layer, and their relative refractive index difference
    • G02B6/03638—Optical fibres characterised both by the number of different refractive index layers around the central core segment, i.e. around the innermost high index core layer, and their relative refractive index difference having 3 layers only
    • G02B6/0365—Optical fibres characterised both by the number of different refractive index layers around the central core segment, i.e. around the innermost high index core layer, and their relative refractive index difference having 3 layers only arranged - - +
    • 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
    • G02B6/02—Optical fibres with cladding with or without a coating
    • G02B6/028—Optical fibres with cladding with or without a coating with core or cladding having graded refractive index
    • G02B6/0288—Multimode fibre, e.g. graded index core for compensating modal dispersion
    • 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
    • G02B6/02—Optical fibres with cladding with or without a coating
    • G02B6/036—Optical fibres with cladding with or without a coating core or cladding comprising multiple layers
    • G02B6/03616—Optical fibres characterised both by the number of different refractive index layers around the central core segment, i.e. around the innermost high index core layer, and their relative refractive index difference
    • G02B6/03622—Optical fibres characterised both by the number of different refractive index layers around the central core segment, i.e. around the innermost high index core layer, and their relative refractive index difference having 2 layers only
    • G02B6/03627—Optical fibres characterised both by the number of different refractive index layers around the central core segment, i.e. around the innermost high index core layer, and their relative refractive index difference having 2 layers only arranged - +
    • 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
    • G02B6/02—Optical fibres with cladding with or without a coating
    • G02B6/036—Optical fibres with cladding with or without a coating core or cladding comprising multiple layers
    • G02B6/03616—Optical fibres characterised both by the number of different refractive index layers around the central core segment, i.e. around the innermost high index core layer, and their relative refractive index difference
    • G02B6/03622—Optical fibres characterised both by the number of different refractive index layers around the central core segment, i.e. around the innermost high index core layer, and their relative refractive index difference having 2 layers only
    • G02B6/03633—Optical fibres characterised both by the number of different refractive index layers around the central core segment, i.e. around the innermost high index core layer, and their relative refractive index difference having 2 layers only arranged - -

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Chemical & Material Sciences (AREA)
  • Dispersion Chemistry (AREA)
  • Optical Communication System (AREA)
  • Optical Fibers, Optical Fiber Cores, And Optical Fiber Bundles (AREA)

Abstract

(57)【要約】本公報は電子出願前の出願データであるた
め要約のデータは記録されません。

Description

【発明の詳細な説明】 発明の技術分野 本発明は光伝送用ファイバに関し、とくに伝送帯域を向
上させる構造の光伝送用ファイバに関するものである。
技術の背景 第１図ａ、ｂに従来の光伝送用ファイバの断面構造およ
び屈折率分布特性を示す。１はコア部、２はクラッド層
、ｎは屈折率、ｎｌはクラッド層の屈折率である。第１
図に示すように、°従来の光伝送用ファイバは、はぼ２
乗分布に近い屈折率分布を有するコア部１と、コア部１
外縁の屈折率に等しい屈折率ｎ１を有するクラッド層２
とで構成されている。従来の構造の光伝送用ファイバに
おいて、広い伝送帯域を得るためには、コア部１の屈折
率分布形状を精密に制御し、最適形状（はぼ２乗分布）
に近づけることが必要とされている。然し、たとえ最適
形状が得られても、コアークラッド境界付近を伝搬する
高次モードは、コア部中心付近の低次モードと伝搬速度
が異なり、帯域を劣化させる効果をもつことが知られて
いる。
この問題を解決するための光ファイバとして、従来よく
知られている光ファイバの断面構造および屈折率分布特
性を第２図ａ、ｂに示す。１はコア部、２′は第１クラ
ッド層、３は第２クラツド層ｄ、は第１クラッド層２′
の屈折率、ｎｌは第２クラッド層３の屈折率である。第
２図ａ、ｂに示すように、はぼ２乗分布に近い屈折率分
布を有するコア部１の周囲に、コア部外縁の屈折率ｎｌ
より小さい屈折率ｎｔの第１クラッド層２′を有し、さ
らに第１クラッド層２′の周囲に屈折率ｎ１の第２クラ
ッド層３を有する構造である。この構造の光伝送用ファ
イバでは、帯域劣化の原因となる高次モードが、伝送損
失の大きな漏れモードとなり、実質的に伝搬しないため
、広帯域が得られると言われている。
従来技術と問題点 第２図ａ、ｂに示した、従来の帯域劣化を除去した構造
の光伝送用ファイバにおいては、実際には、漏れモード
の一部は十分に伝送損失が小さく、第１図ａ、ｂに示し
た構造の従来の光伝送用ファイバと同様に、帯域を劣化
させる原因となるので、広帯域を得ることは難かしかっ
た。
発明の目的 本発明の目的は、従来の欠点を解決し、広帯域伝送な可
能とする構造の光伝送用ファイバを提供することにある
。
以下実施例について詳細に説明する。
発明の実施例 第３図ａ、ｂに本発明による光伝送用ファイバの一実施
例の断面構造および屈折率分布特性を示す。１はコア部
、２′は第１クラッド層、６′は第２クラッド層、４は
第３クラッド層、ｎｌは第１クラッド層２′の屈折率、
ｎｌは第２クラッド層６′の屈折率、ｎｌは第６クラッ
ド層４の屈折率である。本実施例に示す構造の光伝送用
ファイバにおいては、従来問題となっていたコアークラ
ッド境界付近の高次モードや漏れモードをも含めて、伝
搬速度を一致させることが可能となり、極めて広い帯域
が得られる。以下詳細に説明する。
第４図は、第６図ａ、ｂに示した構造、屈折率分布特性
を有する本発明の光伝送用ファイバの伝送特性を理論的
に解析した結果を示すものである。
横軸は正規化伝搬定数Ｘ、縦軸は各モードの相対群遅延
時間である。正規化伝搬定数Ｘは次式で示される。（た
とえば大越孝敬編「光ファイバの基礎」６７ペ一ジオー
ム社刊　１９７７年）ここでｋは真空中の光の波数、ｎ
Ｉ、はコア部の最大屈折率、βは各モードの伝搬定数で
ある。正規伝搬定数ｘは、光伝送用ファイバの半径方向
の位置に対応している。広帯域を得るためには、伝搬モ
ード領域と、伝搬モード領域に連なる漏れモード領域で
、全モードの群遅延時間（伝搬速度）が一致していれば
よい。第４図から、第３ＩＪａ　、　ｂに示した本発明
の実施例の構造の光伝送用ファイバにおいては、第１ク
ラッド層２１の厚さｄが、ｋｏ。
Ｄ＜ｄ＜！４０Ｄ（Ｄはコア部の径で、本実施例では１
００μｍ）の範囲（本実施例では１μｍ　（ｄ　（５μ
ｍ）で広帯域が得られる。なお第１図ａ、ｂに示した従
来構造の光伝送用ファイバは、第６図ａ、ｂの本発明の
実施例の構造においてｄ＝ωの場合に相当し、また第２
図ａ、ｂに示した、従来の改良した構造の光伝送用ファ
イバは、ｄ＝Ｑの場合に相当する。これら従来のいずれ
の場合も、コアークラッド境界のモードが帯域劣化を招
いていることがわかる。
次に本発明の効果を明らかにするため、本発明による光
伝送用ファイバと、従来技術による光伝送用ファイバを
試作し、第１クラッド層の厚さと伝送帯域との関係を測
定した結果を第５図に示す。
供試光伝送用ファイバは、コア部の径Ｄ＝１００μｍ。
光伝送用ファイバの外径１４０μｍ、開口数ＣＬ３で、
種々の構造の光伝送用ファイバについての帯域測定結果
である。ここでｄ＝０およびｄ＝ωは、従°来技術によ
る構造の光伝送用ファイバである。第５図の実測結果か
らも、本発明による構造の光伝送用ファイバは、極めて
広帯域な伝送特性を有することが明らかである。
発明の効果 以上述べたように、本発明は、コア部の外周に第１．第
２１第３のクラッド層を設け、第１クラッド層の厚さを
コア部径のイｏ。−イ。とじ、かつ屈折率をコア部外縁
の屈折率に等しくし、第２クラッド層の屈折率〈第１ク
ラッド層の屈折率、第２クラッド層の屈折率く第３クラ
ッド層屈折率なる構成とすることにより、極めて広帯域
の伝送特性を備えた光伝送用ファイバが得られ、その効
果顕著である。
【図面の簡単な説明】
第１図ａ、ｂおよび第２図ａ、ｂは、それぞれ従来技術
による光伝送用ファイバの断面構造および屈折率分布を
示す図、第３図ａ、ｂは本発明による光伝送用ファイバ
の断面構造および屈折率分布を示す図、第４図は第６図
ａ、ｂの本発明による構造の光伝送用ファイバの伝送特
性を解析した結果、第５図は種々の構造の光伝送用ファ
イバの伝送帯域実測結果である。 １・・・コア部、２　、２’　ｉ　２’・・・第１クラ
ッド層、５゜３′・・・第２クラッド層、４・・・ＩＪ
６クラツド層、ｎｌ。 。ｔ　、　ｎ、ｚ　、　ｎ２”　、　ｎ３・・・屈折率
特許出願人　　住友電気工梨株弐会社 代理　人　弁理士玉蟲久五部 特開昭５９−２３２３０２　（３） 第１図　　　　第２図 第３図 第４図 （ｎ　５ｅｃ７に 正規化伝織定数（Ｘ）

Claims (1)

  1. 【特許請求の範囲】 はぼ２乗分布に近い屈折率分布を有するコア部と、 該コア部周囲に該コア部外縁の屈折率に等しい屈折率を
    有し、かつ該コア径の３’ｆｏｏ　”　′／２ｏの厚さ
    からなる第１クラッド層と、該第１クラッド層の周囲に
    前記第１クラッド層の屈折率より小なる屈折率を有する
    第２クラッド層と、 該第２クラッド層の周囲に前記第２クラッド層の屈折率
    より大なる屈折率を有する第３クラッド層とを具備して
    なる光伝送用ファイバ。
JP58107354A 1983-06-15 1983-06-15 光伝送用フアイバ Pending JPS59232302A (ja)

Priority Applications (7)

Application Number Priority Date Filing Date Title
JP58107354A JPS59232302A (ja) 1983-06-15 1983-06-15 光伝送用フアイバ
US06/599,023 US4715695A (en) 1983-06-15 1984-04-11 Fiber for optical transmission
CA000451982A CA1251965A (en) 1983-06-15 1984-04-13 Fiber for optical transmission
DK195084A DK158027C (da) 1983-06-15 1984-04-16 Fiber til optisk transmission
AU26874/84A AU561707B2 (en) 1983-06-15 1984-04-16 Fiber for optical transmission
EP84106229A EP0131729B1 (en) 1983-06-15 1984-05-30 Fiber for optical transmission
DE8484106229T DE3470961D1 (en) 1983-06-15 1984-05-30 Fiber for optical transmission

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP58107354A JPS59232302A (ja) 1983-06-15 1983-06-15 光伝送用フアイバ

Publications (1)

Publication Number Publication Date
JPS59232302A true JPS59232302A (ja) 1984-12-27

Family

ID=14456932

Family Applications (1)

Application Number Title Priority Date Filing Date
JP58107354A Pending JPS59232302A (ja) 1983-06-15 1983-06-15 光伝送用フアイバ

Country Status (7)

Country Link
US (1) US4715695A (ja)
EP (1) EP0131729B1 (ja)
JP (1) JPS59232302A (ja)
AU (1) AU561707B2 (ja)
CA (1) CA1251965A (ja)
DE (1) DE3470961D1 (ja)
DK (1) DK158027C (ja)

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6363196B1 (en) 1998-08-13 2002-03-26 Alcatel Single mode dispersion-shifted optical fiber with external refractive index ring
JP2006047719A (ja) * 2004-08-05 2006-02-16 Fujikura Ltd 低曲げ損失マルチモードファイバ
JP2011507028A (ja) * 2007-12-13 2011-03-03 コーニング インコーポレイテッド 耐曲げ性マルチモード光ファイバ
JP2011090331A (ja) * 2010-12-28 2011-05-06 Fujikura Ltd 低曲げ損失マルチモードファイバ
JP2011133875A (ja) * 2009-11-25 2011-07-07 Draka Comteq Bv 高帯域マルチモード光ファイバおよび光ファイバシステム
JP2011170353A (ja) * 2010-02-16 2011-09-01 Ofs Fitel Llc 曲げ不感性マルチモードファイバにおける高次モードのモード遅延の均等化
JP2011530725A (ja) * 2008-08-13 2011-12-22 コーニング インコーポレイテッド 少なくとも２つのクラッドを有するマルチモードファイバ
JP2012516457A (ja) * 2008-09-26 2012-07-19 コーニング インコーポレイテッド 高開口数多モード光ファイバ
JP2013521532A (ja) * 2010-03-02 2013-06-10 コーニング インコーポレイテッド 大開口数多モード光ファイバ
US8554036B2 (en) 2008-04-16 2013-10-08 Mitsubishi Cable Industries, Ltd. Graded index multimode optical fiber
JP2015521300A (ja) * 2012-05-31 2015-07-27 コーニング インコーポレイテッド マルチモード光ファイバ及びこのファイバを含むシステム
JP2015212757A (ja) * 2014-05-02 2015-11-26 日本電信電話株式会社 数モード光ファイバおよび数モード光ファイバの設計方法
JP2016534376A (ja) * 2013-09-20 2016-11-04 ドラカ・コムテツク・ベー・ベー 空間分割多重のための少モード光ファイバ

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DE3700565A1 (de) * 1987-01-10 1988-07-28 Licentia Gmbh Lichtwellenleiter
US5048923A (en) * 1989-04-07 1991-09-17 Fujikura, Ltd. Image fiber, image fiber preform, and manufacturing processes thereof
US5235659A (en) * 1992-05-05 1993-08-10 At&T Bell Laboratories Method of making an article comprising an optical waveguide
US5287427A (en) * 1992-05-05 1994-02-15 At&T Bell Laboratories Method of making an article comprising an optical component, and article comprising the component
JPH07261048A (ja) * 1994-03-23 1995-10-13 Sumitomo Electric Ind Ltd 分散補償ファイバ
CA2314961C (en) 1997-12-30 2005-08-09 Ji-Hoon Lee Dispersion shifted optical fiber
NL1024015C2 (nl) 2003-07-28 2005-02-01 Draka Fibre Technology Bv Multimode optische vezel voorzien van een brekingsindexprofiel, optisch communicatiesysteem onder toepassing daarvan en werkwijze ter vervaardiging van een dergelijke vezel.
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US7787731B2 (en) * 2007-01-08 2010-08-31 Corning Incorporated Bend resistant multimode optical fiber
FR2922657B1 (fr) 2007-10-23 2010-02-12 Draka Comteq France Fibre multimode.
FR2932932B1 (fr) * 2008-06-23 2010-08-13 Draka Comteq France Sa Systeme optique multiplexe en longueur d'ondes avec fibres optiques multimodes
FR2933779B1 (fr) * 2008-07-08 2010-08-27 Draka Comteq France Fibres optiques multimodes
FR2940839B1 (fr) * 2009-01-08 2012-09-14 Draka Comteq France Fibre optique multimodale a gradient d'indice, procedes de caracterisation et de fabrication d'une telle fibre
FR2946436B1 (fr) * 2009-06-05 2011-12-09 Draka Comteq France Fibre optique multimode a tres large bande passante avec une interface coeur-gaine optimisee
FR2953605B1 (fr) * 2009-12-03 2011-12-16 Draka Comteq France Fibre optique multimode a large bande passante et a faibles pertes par courbure
FR2953606B1 (fr) * 2009-12-03 2012-04-27 Draka Comteq France Fibre optique multimode a large bande passante et a faibles pertes par courbure
FR2957153B1 (fr) * 2010-03-02 2012-08-10 Draka Comteq France Fibre optique multimode a large bande passante et a faibles pertes par courbure
US9014525B2 (en) 2009-09-09 2015-04-21 Draka Comteq, B.V. Trench-assisted multimode optical fiber
FR2949870B1 (fr) * 2009-09-09 2011-12-16 Draka Compteq France Fibre optique multimode presentant des pertes en courbure ameliorees
FR2953030B1 (fr) 2009-11-25 2011-11-18 Draka Comteq France Fibre optique multimode a tres large bande passante avec une interface coeur-gaine optimisee
FR2950156B1 (fr) * 2009-09-17 2011-11-18 Draka Comteq France Fibre optique multimode
CN101738681B (zh) * 2010-01-20 2011-08-31 长飞光纤光缆有限公司 一种高带宽多模光纤
FR2966256B1 (fr) * 2010-10-18 2012-11-16 Draka Comteq France Fibre optique multimode insensible aux pertes par
FR2966255A1 (fr) * 2010-10-18 2012-04-20 Draka Comteq France Fibre optique multimode insensible aux pertes par courbures
US9481599B2 (en) 2010-12-21 2016-11-01 Corning Incorporated Method of making a multimode optical fiber
FR2971061B1 (fr) 2011-01-31 2013-02-08 Draka Comteq France Fibre optique a large bande passante et a faibles pertes par courbure
DK2482106T5 (da) 2011-01-31 2014-09-22 Draka Comteq Bv Multimode-fiber
EP2503368A1 (en) 2011-03-24 2012-09-26 Draka Comteq B.V. Multimode optical fiber with improved bend resistance
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JP2012516457A (ja) * 2008-09-26 2012-07-19 コーニング インコーポレイテッド 高開口数多モード光ファイバ
JP2011133875A (ja) * 2009-11-25 2011-07-07 Draka Comteq Bv 高帯域マルチモード光ファイバおよび光ファイバシステム
JP2011170353A (ja) * 2010-02-16 2011-09-01 Ofs Fitel Llc 曲げ不感性マルチモードファイバにおける高次モードのモード遅延の均等化
JP2013521532A (ja) * 2010-03-02 2013-06-10 コーニング インコーポレイテッド 大開口数多モード光ファイバ
JP2011090331A (ja) * 2010-12-28 2011-05-06 Fujikura Ltd 低曲げ損失マルチモードファイバ
JP2015521300A (ja) * 2012-05-31 2015-07-27 コーニング インコーポレイテッド マルチモード光ファイバ及びこのファイバを含むシステム
JP2016534376A (ja) * 2013-09-20 2016-11-04 ドラカ・コムテツク・ベー・ベー 空間分割多重のための少モード光ファイバ
JP2015212757A (ja) * 2014-05-02 2015-11-26 日本電信電話株式会社 数モード光ファイバおよび数モード光ファイバの設計方法

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EP0131729A1 (en) 1985-01-23
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DK195084A (da) 1984-12-16
EP0131729B1 (en) 1988-05-04
AU2687484A (en) 1984-12-20
DK158027C (da) 1990-08-13
DK158027B (da) 1990-03-12
CA1251965A (en) 1989-04-04
DE3470961D1 (en) 1988-06-09
US4715695A (en) 1987-12-29

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