JPH01261602A - Optical fiber - Google Patents

Optical fiber

Info

Publication number
JPH01261602A
JPH01261602A JP63090595A JP9059588A JPH01261602A JP H01261602 A JPH01261602 A JP H01261602A JP 63090595 A JP63090595 A JP 63090595A JP 9059588 A JP9059588 A JP 9059588A JP H01261602 A JPH01261602 A JP H01261602A
Authority
JP
Japan
Prior art keywords
core
refractive index
fluorine
optical fiber
graded
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
JP63090595A
Other languages
Japanese (ja)
Inventor
Tsugio Sato
継男 佐藤
Kenichi Komura
小村　憲一
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.)
Furukawa Electric Co Ltd
Original Assignee
Furukawa Electric Co 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 Furukawa Electric Co Ltd filed Critical Furukawa Electric Co Ltd
Priority to JP63090595A priority Critical patent/JPH01261602A/en
Publication of JPH01261602A publication Critical patent/JPH01261602A/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
    • G02B6/02—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
    • G02B6/0281—Graded index region forming part of the central core segment, e.g. alpha profile, triangular, trapezoidal core

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Optical Fibers, Optical Fiber Cores, And Optical Fiber Bundles (AREA)

Abstract

PURPOSE:To obtain PCS of a graded index type of wide bands at a low cost by forming the refractive index distribution of a core to the graded index type. CONSTITUTION:The refractive index distribution of the core 1 of the optical fiber having the core 1 made of quartz glass and a clad 2 which is provided around the core 1 and consists of the fluorine-contained resin having the refractive index smaller than the refractive index of the core 1 is made into the graded index type. Namely, the core 1 is made of the quartz glass having the refractive index distribution of the graded index type and is made of, for example, a VAD method. The clad 2 formed around this core 1 is formed of the fluorine-contained resin having the refractive index equal to or lower than the refractive index of pure quartz. The PCS of the wide bands and low cost is thereby obtd.

Description

【発明の詳細な説明】 〔技術分野〕 本発明は、石英製のコアに含フッ素レジンからなるクラ
ッドを設けた、いわゆるプラスチッククラツド光ファイ
バに関するものである。DETAILED DESCRIPTION OF THE INVENTION [Technical Field] The present invention relates to a so-called plastic clad optical fiber in which a quartz core is provided with a cladding made of a fluorine-containing resin.

〔従来技術〕[Prior art]

従来からＦＡ、ＯＡ等の短距離のＬＡＮに大口径、高Ｎ
Ａ（通常０．３５〜０．４０）という特性を有するプラ
スチッククラツド光ファイバ（以下ＰＣ３という）が、
その経済性をも活かして利用されている０例えば−例と
して実開昭５７−４５６１１号公報に記載のもの。Conventionally, large diameter, high N is used for short distance LAN such as FA and OA.
A plastic clad optical fiber (hereinafter referred to as PC3) having a characteristic of A (usually 0.35 to 0.40) is
For example, the method described in Japanese Unexamined Utility Model Publication No. 57-45611 is used to take advantage of its economic efficiency.

この典型的なものを上げると、例えば第３図に示すよう
なものがある。これはコアｌが純粋石英ガラスからなり
、クラッド２がシリコン樹脂あるいはフッ素樹脂等から
なるもので、しかも前記コア１の屈折率分布はステップ
インデックス型である。このようにコアｌの屈折率分布
がステップインデックス型であると、伝送帯域は１０〜
２０Ｍ）Ｉｚと狭い、そこで高帯域が必要な場合は、第
４図に示すようにコアｌ及びクラッド２が共に石英ガラ
スからなる、いわゆる石英ガラス製の光ファイバを用い
、かつコア１の屈折率分布を、該コアｌ内にドープさせ
るＧｅ、　？ｉ等のドープ材をコア１の径方向に変化さ
せることでグレーデツトインデックス型になるように調
整していた。この種のグレーデツトインデックス型石英
ガラス製光ファイバの伝送帯域は数１００Ｈｚ　〜数Ｇ
Ｈｚ　　（ＮＡは０．２程度）である。Typical examples include the one shown in FIG. 3, for example. The core 1 is made of pure silica glass, the cladding 2 is made of silicone resin or fluororesin, and the refractive index distribution of the core 1 is of a step index type. If the refractive index distribution of the core l is of the step index type as described above, the transmission band is 10~
20M) Iz, if a high band is required, use a so-called silica glass optical fiber in which the core 1 and the cladding 2 are both made of silica glass, as shown in Figure 4, and the refractive index of the core 1 is distribution of Ge doped into the core l, ? By changing the doping material such as i in the radial direction of the core 1, it was adjusted to be a graded index type. The transmission band of this type of graded index type silica glass optical fiber is from several 100 Hz to several G.
Hz (NA is about 0.2).

以上に述べたＰＯ２および石英ガラス製のグレーデツト
インデックス型光ファイバの各々の特徴を整理すると、 （１）石英ガラス製のグレーデツトインデックス型光フ
ァイバは伝送帯域は広いが、クラッドが石英ガラスであ
る分だけＰＯ２に比較してコスト高を免れ得ない。If we summarize the characteristics of each of the PO2 and silica glass graded index optical fibers mentioned above, (1) silica glass graded index optical fibers have a wide transmission band, but the cladding is made of silica glass. Therefore, compared to PO2, it is inevitable that the cost will be higher.

（２）一方ＰＣ３ではコストは安いが、伝送帯域が狭い
。(2) On the other hand, although the cost of PC3 is low, the transmission band is narrow.

」−記各々の特徴点、問題点を鑑み、ｐｃｓの利用分野
でも経済性に優れ、し７かも広帯域光ファイバの要求が
高まりつつある。Considering the characteristics and problems of each of the above, there is an increasing demand for economical and broadband optical fibers in the field of PCS applications.

〔発明の目的］ 前記問題に鑑み本発明の目的は、低７ス（・で、しかも
広帯域、具体的にはグレーデツトインデックス型のＰＯ
２を提供することにある。[Object of the Invention] In view of the above-mentioned problems, the object of the present invention is to provide a low-7-band, wide-band, specifically graded index type PO
2.

（発明の構成〕 前記目的を達成すべく本発明は、石英ガラス製のコアと
、咳コアの周りに設けた前記コアの屈折率より小さい屈
折率を有する含フッ素レジンからなるクラッドとを有す
る光コア・イペにおいて、前記コアの屈折率分布はグレ
ーデットインヂ・、・クス型になっていることを特徴と
するものである。(Structure of the Invention) In order to achieve the above object, the present invention provides an optical fiber having a core made of quartz glass and a cladding made of a fluorine-containing resin having a refractive index lower than the refractive index of the core provided around the cough core. The core ipe is characterized in that the refractive index distribution of the core is in the form of a graded index.

〔発明の実施例］ Ｊソ下に本発明の実施例を図面を参照して詳細に説明す
る。本発明のＰＯ２は第１回に示すように、コアｌはグ
レープントインデックス型の屈折率分布を有する石英ガ
ラス製のもので、これは例えばＶＡＤ法にて作製する。[Embodiments of the Invention] Embodiments of the present invention will be described in detail below with reference to the drawings. As shown in the first part of the PO2 of the present invention, the core l is made of quartz glass having a gradient index type refractive index distribution, and is manufactured by, for example, the VAD method.

そしてこのコア１の周りに施されるクラッド２は純粋石
英ガラスの屈折率と同等かそれ以下の屈折率を有する含
フ・ン素レジンにより形成する。The cladding 2 provided around the core 1 is formed of a fluorine-containing resin having a refractive index equal to or lower than that of pure silica glass.

ここで含フッ素レジンにおけるポリマー中のフン素の含
有率と屈折率の関係を第２図に示す〔石割和夫他　日化
誌　Ｐ１９２４　Ｎｏ１Ｏ（１９８５））。ここでＯお
よびＩはフルオロアルキルメタクリレートで、Δおよび
ムはフルオロアルキル　２−フルオロアクリレートであ
る。Here, the relationship between the content of fluorine in the polymer and the refractive index in a fluorine-containing resin is shown in FIG. 2 [Kazuhiro Ishiwari et al., Nikka Shi, P1924 No. 1O (1985)]. where O and I are fluoroalkyl methacrylate, and Δ and M are fluoroalkyl 2-fluoroacrylate.

尚１．−ｍ的にＮＡを太き（とりたいときは屈折率のよ
り低いものが選沢される５ 本発明にあ−ては、例えば第１図において石英ガラス製
のコー？１でΔ１を形成し７、含フッ素［／ジンによる
クラッド２で△、を形成するようにし５てもよい。この
ようにすれば石英ガラス製のコア１は１種類のみ用意し
ておき含フッ素レジンからなるクラッド２の含フッ素レ
ジン中のフッ素含有量を調節するだけで所望の屈折率差
△＝Δ１＋△２のものを容易、換言すると低コトスで得
ることができる。尚、屈折率差Δを大きくするとＮＡが
大きくなるが、伝送帯域は逆に制限され、屈折率差Δを
小さくするとＮＡは小さくなるが、伝送帯域は広がる。Note 1. In the present invention, for example, in FIG. 1, Δ1 is formed with a quartz glass core 1. 7. It is also possible to form △ with the fluorine-containing resin cladding 2. In this way, only one type of quartz glass core 1 is prepared and the cladding 2 made of fluorine-containing resin is prepared. By simply adjusting the fluorine content in the fluorine-containing resin, the desired refractive index difference △=Δ1+△2 can be easily obtained, in other words, at a low cost.Increasing the refractive index difference Δ increases the NA. However, the transmission band is conversely limited, and if the refractive index difference Δ is made smaller, the NA becomes smaller, but the transmission band becomes wider.

それ故本発明の応用とｔ７て、要求特性に応じてクラッ
ド２を形成する含フッ素レジン中のフッ素の含有量を１
！１節すれば、このよう要求に容易に対処できる。Therefore, according to the application of the present invention and t7, the fluorine content in the fluorine-containing resin forming the cladding 2 is reduced to 1.
! With one section, you can easily meet these requirements.

以下に本発明の実施例を示す。Examples of the present invention are shown below.

（実施例１） ドープ材としてＧｅＯ□を使用した屈折率分布がグレー
デットインデンクス型の石英ガラス製の母材をＶＡＤ法
にて製造し、これをガラス化した後線引し、コア１を得
た。該コア１の第１図における△１は約１９≦であった
。尚、コア１の外径は１００μ園である。またクラッド
２は前記コア１を線引すると同時に被覆し、外径１４０
μ圀のグレーデットインデンクス型ＰＣ３を得た。尚、
このクラッド２はフルオロアクリルメタクリレート（屈
折率１．４５８）をメチルイソブチルケトン（旧Ｂに）
に熔解した液を塗布し、これを約５００　’Ｃで焼付た
ものである。このＰＯ２のＮＡは０．２０で伝送帯域は
８００ＭＨｚであった。(Example 1) A quartz glass base material with a graded index type refractive index distribution using GeO Obtained. Δ1 in FIG. 1 of the core 1 was about 19≦. Note that the outer diameter of the core 1 is 100 μm. The cladding 2 is coated on the core 1 at the same time as it is drawn, and has an outer diameter of 140 mm.
A graded index type PC3 of μ area was obtained. still,
This cladding 2 combines fluoroacrylic methacrylate (refractive index 1.458) with methyl isobutyl ketone (old B).
A liquid melted on the surface was applied and baked at approximately 500'C. The NA of this PO2 was 0.20 and the transmission band was 800 MHz.

（実施例２） 実施例１と同一のコア母材から同様にして同一外径、す
なわち外径１００μｍのコア１を線引きして得た。この
線引と同時にフルオロアクリルメタクリレート（ｒｆ、
折率１．４０）を旧ＢＫに溶解した液を塗布し、これを
前記実施例１と同様に焼付け、クラッド径１４０μ−の
ＰＯ２を得た。このＰＯ２のＮＡは０．４２で、伝送帯
域は１００ＭＨｚであ−、た。(Example 2) A core 1 having the same outer diameter, that is, 100 μm, was obtained by drawing from the same core base material as in Example 1 in the same manner. At the same time as this line drawing, fluoroacrylic methacrylate (RF,
A solution obtained by dissolving BK (refractive index 1.40) in old BK was applied and baked in the same manner as in Example 1 to obtain PO2 with a cladding diameter of 140 .mu.m. The NA of this PO2 was 0.42, and the transmission band was 100 MHz.

以上のように本発明のＰＯ２によれば、（１）石英ガラ
ス製のグレーデツトインデックス型光ファイバに比較し
、て、クラッド形成が容易かつ安価にて！！！造可能で
ある。As described above, according to PO2 of the present invention, (1) cladding is easier and cheaper to form than a graded index optical fiber made of quartz glass! ! ! It is possible to build

（２）クラッドを形成する含フッ素レジンのフッ素含有
量を変えるだけで所望するＮＡ、あるいは伝送帯域のも
のが容易に得られる。換言するとグレーデツトインデッ
クス型の屈折分布を有する石英ガラス製のコアは１ｆｆ
ｆ！！用意しておくだけでよい。(2) A desired NA or transmission band can be easily obtained by simply changing the fluorine content of the fluorine-containing resin forming the cladding. In other words, a core made of quartz glass with a graded index type refractive distribution is 1ff.
f! ! All you have to do is prepare.

（３）従来のＰＯ２に比較すると格段に伝送帯域が広く
とれる。(3) Compared to conventional PO2, the transmission band can be much wider.

〔発明の効果〕〔Effect of the invention〕

以上のように本発明によれば、伝送帯域の広い、かつ低
コストのＰＯ５を提供することができる。As described above, according to the present invention, it is possible to provide a low-cost PO5 with a wide transmission band.

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

第１図は本発明のＰＯ２の一実施例を示す屈折率分布及
び横断面図、第２図は含フッ素レジンのフッ素含有量と
屈折率の関係を示すグラフ、第３図は従来のＰＯ２の屈
折率分布および横断面図、第４図は石英ガラス製のグレ
ーデツトインデックス型光ファイバの屈折率分布および
横断面図である。 １〜コア　２〜クラツド 特許出願人　　　古河電気工業株式会社第３図 第４図Fig. 1 is a refractive index distribution and cross-sectional view showing an example of PO2 of the present invention, Fig. 2 is a graph showing the relationship between the fluorine content and refractive index of a fluorine-containing resin, and Fig. 3 is a graph showing the relationship between the fluorine content and refractive index of a conventional PO2. Refractive Index Distribution and Cross-sectional View FIG. 4 shows the refractive index distribution and cross-sectional view of a graded index optical fiber made of quartz glass. 1 ~ Core 2 ~ Clad Patent applicant Furukawa Electric Co., Ltd. Figure 3 Figure 4

Claims (1)

【特許請求の範囲】[Claims] 石英ガラス製のコアと、該コアの周りに設けた前記コア
の屈折率より小さい屈折率を有する含フッ素レジンから
なるクラッドとを有する光ファイバにおいて、前記コア
の屈折率分布はグレーデットインデックス型になってい
ることを特徴とする光ファイバ。In an optical fiber having a core made of quartz glass and a cladding made of a fluorine-containing resin having a refractive index smaller than the refractive index of the core provided around the core, the refractive index distribution of the core is of a graded index type. An optical fiber characterized by:
JP63090595A 1988-04-13 1988-04-13 Optical fiber Pending JPH01261602A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP63090595A JPH01261602A (en) 1988-04-13 1988-04-13 Optical fiber

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP63090595A JPH01261602A (en) 1988-04-13 1988-04-13 Optical fiber

Publications (1)

Publication Number Publication Date
JPH01261602A true JPH01261602A (en) 1989-10-18

Family

ID=14002822

Family Applications (1)

Application Number Title Priority Date Filing Date
JP63090595A Pending JPH01261602A (en) 1988-04-13 1988-04-13 Optical fiber

Country Status (1)

Country Link
JP (1) JPH01261602A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2011221450A (en) * 2010-04-14 2011-11-04 Sumitomo Electric Ind Ltd Plastic clad optical fiber

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2011221450A (en) * 2010-04-14 2011-11-04 Sumitomo Electric Ind Ltd Plastic clad optical fiber

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