公开(公告)号：EP1441244B1

公开(公告)日：2006-11-22

申请号：EP02768087.5

申请日：2002-09-26

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

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

IPC分类号： G02B6/02 ,  G02B6/10

CPC分类号： G02B6/024 ,  G02B6/02 ,  G02B6/02338 ,  G02B6/02357 ,  G02B6/105

摘要： A polarization preserving optical fiber and an absolute single polarization optical fiber capable of transmission over a long distance with the polarization condition of a signal light kept preserved. The polarization preserving optical fiber comprises a core unit 11, a photonic crystal structure clad 12 and a jacket unit 13. The photonic crystal structure clad 12 is divided into four divided portions 12a, 12b, 12c, 12d divided by broken lines extending from the center toward the outer periphery. The diameter d2 of lattice holes 14a, 14c in the vicinity of the core unit 11 out of a plurality of lattice holes provided by a pair of divided portions 12a and 12c facing each other across the core unit 11 is larger than the diameter d1 of a lattice holes provided by the other pair of facing divided portions 12b, 12d and larger than a lattice interval Λ.

公开(公告)号：EP1441244A1

公开(公告)日：2004-07-28

申请号：EP02768087.5

申请日：2002-09-26

申请人： Nippon Telegraph and Telephone Corporation ,  Mitsubishi Cable Industries, Ltd.

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

IPC分类号： G02B6/16 ,  G02B6/00

CPC分类号： G02B6/024 ,  G02B6/02 ,  G02B6/02338 ,  G02B6/02357 ,  G02B6/105

摘要： A polarization-maintaining optical fiber and absolutely single-polarization optical fiber are provided which enable long distance transmission maintaining a polarization state of signal light. The polarization-maintaining optical fiber includes a core (11), photonic crystal cladding (12) and jacket (13). The photonic crystal cladding (12) is divided into four segments (12a, 12b, 12c and 12d) by broken lines from the center to the periphery. Among a plurality of grating holes in a pair of segments (12a and 12c) opposed to each other with respect to the core (11), the diameter (d2) of grating holes (14a and 14c) close to the core (11) is greater than the diameter (d1) of grating holes in another pair of segments (12b and 12d) opposed with each other, and than a grating constant (Λ).

摘要翻译： 提供了保持偏振的光纤和绝对单偏振光纤，其能够保持信号光的偏振状态的长距离传输。 偏振保持光纤包括芯（11），光子晶体包层（12）和护套（13）。 光子晶体包层（12）通过从中心到周边的虚线分成四个段（12a，12b，12c和12d）。 在相对于芯部（11）彼此相对的一对部分（12a和12c）中的多个光栅孔中，靠近芯部（11）的光栅孔（14a和14c）的直径（d2）是 大于彼此相对的另一对段（12b和12d）中的光栅孔的直径（d1），并且大于光栅常数（LAMBDA）。