JP2013107792A - 光ファイバ母材、光ファイバ製造方法および光ファイバ - Google Patents
光ファイバ母材、光ファイバ製造方法および光ファイバ Download PDFInfo
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Abstract
【解決手段】光ファイバ母材10は、石英ガラス系のものであって、コア部20およびクラッド部30を備える。コア部20は、中心軸を含む第一コア部21と、この第一コア部21の外周に設けられた第二コア部22とを含む。クラッド部30は、第二コア部22の外周に設けられた第一クラッド部31と、この第一クラッド部31の外周に設けられた第二クラッド部32とを含む。コア部20は、平均濃度5原子ppm以上のアルカリ金属元素を含有する。第一クラッド部31の外周部におけるOH基の濃度は最大値で200mol ppm以上である。
【選択図】図1
Description
Claims (12)
- 石英ガラス系の光ファイバ母材であって、
平均濃度5原子ppm以上のアルカリ金属元素を含有するコア部と、前記コア部の外周に設けられた第一クラッド部と、前記第一クラッド部の外周に設けられた第二クラッド部とを備え、
前記第一クラッド部の外周部におけるOH基の濃度が最大値で200mol ppm以上である、
ことを特徴とする光ファイバ母材。 - 前記第一クラッド部は、線引後の光ファイバとした際の直径が30μm以上45μm以下に相当する外径を有することを特徴とする請求項1に記載の光ファイバ母材。
- 前記コア部のアルカリ金属元素の濃度の平均値が500原子ppm以下であることを特徴とする請求項1に記載の光ファイバ母材。
- 前記コア部のOH基の濃度の平均値が0.01mol ppm以下であることを特徴とする請求項1に記載の光ファイバ母材。
- 前記第二クラッド部が、前記第一クラッド部の外周に気相合成により合成した石英系ガラス粉を焼結することにより透明化したものである、ことを特徴とする請求項1に記載の光ファイバ母材。
- 前記第一クラッド部に対する前記第二クラッド部の比屈折率差が0.01%以上であることを特徴とする請求項1に記載の光ファイバ母材。
- 前記コア部が塩素元素およびフッ素元素を更に含有し、
前記コア部におけるアルカリ金属元素,塩素元素およびフッ素元素を除くドーパントの濃度が、前記コア部全体の平均値で10原子ppm以下である、
ことを特徴とする請求項1に記載の光ファイバ母材。 - 前記コア部が、中心軸を含む第一コア部と、前記第一コア部の外周に設けられた第二コア部とを含み、
前記第一コア部のアルカリ金属元素の濃度の最大値が100原子ppm以上であり、前記第一コア部の塩素元素の濃度の平均値が1000原子ppm以下であり、
前記第二コア部のアルカリ金属元素の平均値が10原子ppm以下であり、前記第二コア部の塩素元素の濃度の平均値が1000原子ppm以上である、
ことを特徴とする請求項1に記載の光ファイバ母材。 - 請求項1〜8の何れか1項に記載の光ファイバ母材を線引して、波長1550nmにおける伝送損失が0.180dB/km以下であって波長1380nmにおける伝送損失が0.80dB/km以下である光ファイバを製造することを特徴とする光ファイバ製造方法。
- 請求項1〜8の何れか1項に記載の光ファイバ母材を線引して製造される光ファイバであって、
アルカリ金属元素を含有し前記コア部に対応するコア領域と、前記コア領域の外周に設けられ前記第一クラッド部に対応する第一クラッド領域と、前記第一クラッド領域の外周に設けられ前記第二クラッド部に対応する第二クラッド領域とを備え、
前記第一クラッド領域の外径が30μm以上45μm以下であり、前記コア領域および前記第一クラッド領域に圧縮応力が残留し、波長1550nmにおける伝送損失が0.185dB/km以下であり、波長1380nmにおける伝送損失が0.80dB/km以下である、
ことを特徴とする光ファイバ。 - 前記第一クラッド領域と前記第二クラッド領域との界面領域におけるOH基の濃度が1molppm以上であることを特徴とする請求項10に記載の光ファイバ。
- 前記コア領域のアルカリ金属元素の濃度の平均値が0.2ppm以上であることを特徴とする請求項10に記載の光ファイバ。
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