公开(公告)号：EP1507154B8

公开(公告)日：2008-03-26

申请号：EP03752909.6

申请日：2003-05-16

申请人： NIPPON TELEGRAPH AND TELEPHONE CORPORATION ,  Mitsubishi Cable Industries, Ltd.

发明人： SUZUKI, Kazunori c/o NTT Intellectual Property ,  KAWANISHI, Satoki c/o NTT Intellectual Property ,  KUBOTA, Hirokazu c/o NTT Intellectual Property ,  TANAKA, Masatoshi, MITSUBISHI CABLE INDUSTRIES, LTD. ,  FUJITA, Moriyuki, MITSUBISHI CABLE INDUSTRIES, LTD

IPC分类号： G02B6/02

CPC分类号： G02B6/02338 ,  G02B6/02042 ,  G02B6/02242 ,  G02B6/02276 ,  G02B6/02347 ,  G02B6/02361 ,  G02B6/0281 ,  G02B6/03627 ,  G02B6/03644 ,  G02B6/03688

摘要： A 1.55-micron-zone dispersion shift optical fiber low in loss and gentle in dispersion slope. A core area a is formed by adding high-concentration GeO2. A core area b consists of pure SiO2 glass. Many holes (4) extending in a longitudinal direction of the optical fiber are formed in a clad section (3) disposed around core areas. The positions of holes (4) in the clad section (3) are not at random, and they form a honeycomb shape where a regular hexagon having a side length of Lambda is used as a basic lattice. At the center of core areas (1, 2), an area (3) higher in refractive index than the area surrounding the core areas (1, 2) is provided, and the refractive index distributions of the core areas (1, 2) are provided such that the group velocity dispersion at an operation wavelength of this area (3) is a normal dispersion.