JP5687355B2 - 曲げ耐性を有しコア径が大きく高開口数のマルチモード光ファイバ - Google Patents
曲げ耐性を有しコア径が大きく高開口数のマルチモード光ファイバ Download PDFInfo
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Classifications
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- 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
-
- 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
- G02B6/03638—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 - - +
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- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Chemical & Material Sciences (AREA)
- Dispersion Chemistry (AREA)
- Glass Compositions (AREA)
- Optical Fibers, Optical Fiber Cores, And Optical Fiber Bundles (AREA)
Description
石英管:チューブ形状の基底管であり、その内壁には、PCVD化学反応のガラス形態酸化沈積物が形成される。
コア層:光ファイバの横断面の中心部分に位置し、光ファイバの主な光誘導領域である。
インナークラッド層:光ファイバの横断面において、コア層に近隣するリング形状領域である。
埋め込みインナークラッド層:光ファイバの横断面において、インナークラッド層に近隣するリング形状領域である。
アウタークラッド層:光ファイバの横断面において、埋め込みインナークラッド層に近隣するリング形状領域である。
比屈折率差:
べき法則屈折率分布断面:
以下のべき指数関数(power exponential function)を満足する屈折率分布形態である。そのうち、n1は、光ファイバの軸心の屈折率であり、rは、光ファイバの軸心からの距離であり、aは、光ファイバのコアの半径であり、αは分布指数であり、Δは、コア/クラッド比屈折率差である。
純石英ガラス管をプラズマ化学気相成長(PCVD)装置に固定してドーピングと堆積を行い、反応気体の四塩化珪素(SiCl4)と酸素(O2)に対して、フッ素を含有する気体を入れ、フッ素(F)ドーピングを導入する。四塩化ゲルマニウム(GeCl4)を入れてゲルマニウム(Ge)ドーピングを導入する。マイクロ波によって管内の反応気体をプラズマ化してプラズマ体にし、最終的にガラスの形態で管の内壁に堆積させる。上記光ファイバ導波路構造のドーピング要求に基づいて、混合気体におけるドーピング気体の流量を変えることにより、各クラッド層とコア層を順に堆積する。堆積終了後、電気加熱炉で堆積管を中実のコア棒につぶさせる。それからフッ化水素酸(HF)を採用し、必要に応じてコア棒に対して部分的な腐食を行う。それから合成の純石英ガラス又はフッ素ドーピング石英ガラスをチューブとしてRIT工程で光ファイバプレフォームを作製し、又は、OVDかVAD被覆堆積工程でコア棒の外部にアウタークラッド層を堆積することにより光ファイバプレフォームを作製する。光ファイバプレフォームを線引塔に置き光ファイバに延ばし、光ファイバの表面に内外二層の紫外線で硬化したポリアクリル酸樹脂を塗布することで得る。
実施例におけるマクロベンド付加損失と満注入帯域幅の測定について以下に説明する。
マクロベンド付加損失は、FOTP−62(IEC−60793−1−47)方法に基づいて測定して得る。測定される光ファイバは、一定の径(例えば15mm、20mm、30mmなど)でn周巻き取り、それから繰り出し、巻き取る前後の光電力の変化を測定して、これを光ファイバのマクロベンド付加損失とする。測定時に、エンサークルドフラックス(Encircled Flux)光注入条件を採用する。エンサークルドフラックス(Encircled Flux)光注入条件は、以下の方法によって取得できる。測定される光ファイバの前端に長さ2メートルでコア径50マイクロ・メートルの普通のマルチモード光ファイバを溶接し、該光ファイバの中部に径25mmで1周巻き取り、全モード励振(OFL)状態の光が該光ファイバに注入するときに、測定される光ファイバがエンサークルドフラックス(Encircled Flux)光注入となる。
コア層と各クラッド層の設計は、図1、3に示される。本発明による製造方法を用いてプレフォームを一組製造し、600メートル/分の線引速度で線引する。光ファイバの構造と主要性能パラメータは、表1を参照する。
Claims (7)
- コア層と、コア層を被覆するクラッド層とを含む曲げ耐性を有しコア径が大きく高開口数のマルチモード光ファイバにおいて、前記コア層の半径R1は、28〜50マイクロ・メートルであり、コア層屈折率断面は、放物線形状を呈し、αが1.9〜2.2であり、最大比屈折率差Δ1%maxが2.15%〜2.5%であり、コア層の外部のクラッド層は、内から外へと順にインナークラッド層及び/又は埋め込みインナークラッド層、アウタークラッド層であり、前記インナークラッド層の半径R2は、28〜55マイクロ・メートルであり、比屈折率差Δ2%が−0.1%〜0.1%であり、前記埋め込みインナークラッド層の半径R3は、28〜60マイクロ・メートルであり、比屈折率差Δ3%が−0.15%〜−0.8%であり、光ファイバの開口数は0.304〜0.33であることを特徴とする曲げ耐性を有しコア径が大きく高開口数のマルチモード光ファイバ。
- 埋め込みインナークラッド層の外部にアウタークラッド層が被覆されており、前記アウタークラッド層の半径R4は、60〜65マイクロ・メートルであり、アウタークラッド層の比屈折率差Δ4%が−0.1%〜0.1%であることを特徴とする請求項1に記載の曲げ耐性を有しコア径が大きく高開口数のマルチモード光ファイバ。
- 埋め込みインナークラッド層の比屈折率差Δ3%は、径方向に沿って一定であるか次第に変化するものであり、前記次第に変化することは、内から外へと逓増することで次第に変化すること、又は内から外へと逓減することで次第に変化することを含むことを特徴とする請求項1又は2に記載の曲げ耐性を有しコア径が大きく高開口数のマルチモード光ファイバ。
- 前記コア層と各クラッド層は、ゲルマニウムドーピング、又はフッ素ドーピング、又はゲルマニウム及びフッ素ドーピング、又は純石英の石英ガラスからなることを特徴とする請求項1又は2に記載の曲げ耐性を有しコア径が大きく高開口数のマルチモード光ファイバ。
- 光ファイバは、波長850nmにおいて200MHz‐kmか200MHz‐kmより大きい帯域幅を有することを特徴とする請求項1又は2に記載の曲げ耐性を有しコア径が大きく高開口数のマルチモード光ファイバ。
- 光ファイバは、波長1300nmにおいて200MHz‐kmか200MHz‐kmより大きい帯域幅を有することを特徴とする請求項1又は2に記載の曲げ耐性を有しコア径が大きく高開口数のマルチモード光ファイバ。
- 光ファイバは、波長850nmにおいて、7.5mmのベンド半径で2周巻き取ることによるベンド付加損失が0.35dB以下であり、15mmのベンド半径で2周巻き取ることによるベンド付加損失が0.2dB以下であり、30mmのベンド半径で100周巻き取ることによるベンド付加損失が0.2dB以下であることを特徴とする請求項1又は2に記載の曲げ耐性を有しコア径が大きく高開口数のマルチモード光ファイバ。
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CN201110178288.8 | 2011-06-28 | ||
CN2011101782888A CN102193142B (zh) | 2011-06-28 | 2011-06-28 | 一种抗弯曲大芯径高数值孔径多模光纤 |
PCT/CN2012/072221 WO2013000291A1 (zh) | 2011-06-28 | 2012-03-13 | 一种抗弯曲大芯径高数值孔径多模光纤 |
Publications (2)
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JP2014501944A JP2014501944A (ja) | 2014-01-23 |
JP5687355B2 true JP5687355B2 (ja) | 2015-03-18 |
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JP2013541201A Active JP5687355B2 (ja) | 2011-06-28 | 2012-03-13 | 曲げ耐性を有しコア径が大きく高開口数のマルチモード光ファイバ |
Country Status (8)
Country | Link |
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US (1) | US9052435B2 (ja) |
EP (1) | EP2700988B1 (ja) |
JP (1) | JP5687355B2 (ja) |
KR (1) | KR101568171B1 (ja) |
CN (1) | CN102193142B (ja) |
MY (1) | MY170780A (ja) |
SG (1) | SG191857A1 (ja) |
WO (1) | WO2013000291A1 (ja) |
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CN102193142B (zh) * | 2011-06-28 | 2013-06-26 | 长飞光纤光缆有限公司 | 一种抗弯曲大芯径高数值孔径多模光纤 |
US8565567B2 (en) * | 2011-11-23 | 2013-10-22 | Sumitomo Electric Industries, Ltd. | Multi-mode optical fiber |
CN102539015B (zh) * | 2012-02-15 | 2013-11-20 | 长飞光纤光缆有限公司 | 一种分布式温度传感光纤 |
US9113347B2 (en) | 2012-12-05 | 2015-08-18 | At&T Intellectual Property I, Lp | Backhaul link for distributed antenna system |
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