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    Method for compensating modal dispersion in multimode optical fiber transmission path
    2.
    发明授权
    Method for compensating modal dispersion in multimode optical fiber transmission path 有权
    多模光纤传输路径补偿模态色散的方法

    公开(公告)号：US07139457B2

    公开(公告)日：2006-11-21

    申请号：US11194463

    申请日：2005-08-02

    申请人： Ning Guan ,  Shinji Habu ,  Katsuhiro Takenaga ,  Kuniharu Himeno ,  Koichi Harada

    发明人： Ning Guan ,  Shinji Habu ,  Katsuhiro Takenaga ,  Kuniharu Himeno ,  Koichi Harada

    IPC分类号： G02B6/26 ,  G02B6/10

    CPC分类号： G02B6/268 ,  G02B6/0288 ,  H04B10/2581

    摘要： In an optical transmission path including multimode optical fibers, modal dispersion is reduced so that signal light can be transmitted at high speed and across a broad band, at low-cost and over a long distance. To reduce modal dispersion, when the transmission path is constructed by coupling a plurality of multimode optical fibers, a length ratio for the multimode optical fibers that obtains the maximum band of the optical transmission path is determined, and the multimode optical fibers are coupled according to this length ratio. The multimode optical fibers that are used have specific refractive index profiles as mode dispersion-compensating fibers. The compensated fiber and the mode dispersion-compensating fiber are coupled with specific lengths.

    摘要翻译： 在包括多模光纤的光传输路径中，模式色散减小，使得信号光可以低速和超长距离以高速和宽带传输。 为了减少模态色散，当通过耦合多个多模光纤构成传输路径时，确定获得光传输路径的最大频带的多模光纤的长度比，并且多模光纤根据 这个长度比。 使用的多模光纤具有作为模式色散补偿光纤的特定折射率分布。 补偿光纤和模式色散补偿光纤以特定长度耦合。

    Optical fiber
    4.
    发明授权
    Optical fiber 有权
    光纤

    公开(公告)号：US07164835B2

    公开(公告)日：2007-01-16

    申请号：US11244195

    申请日：2005-10-06

    申请人： Shoichiro Matsuo ,  Kuniharu Himeno ,  Koichi Harada ,  Masataka Ikeda

    发明人： Shoichiro Matsuo ,  Kuniharu Himeno ,  Koichi Harada ,  Masataka Ikeda

    IPC分类号： G02B6/036

    CPC分类号： G02B6/02009 ,  G02B6/0365 ,  G02B6/03672 ,  G02B6/03688

    摘要： An optical fiber includes: a core at a center; a first cladding layer; a second cladding layer; and a third cladding layer. A maximum refractive index of the core is greater than any of maximum refractive indices of the first cladding layer, the second cladding layer, and the third cladding layer, and the maximum refractive index of the second cladding layer is smaller than any of the maximum refractive indices of the first and the third cladding layer. Additionally, a ratio of a2/a1 is not less than about 2.5 and not more than about 4.5, where a1 represents the radius of the core, and a2 represents the radius of an outer periphery of the first cladding layer, and a relative refractive index difference of the core with respect to a maximum refractive index of the third cladding layer is not less than 0.20% and not more than 0.70%.

    摘要翻译： 光纤包括：中心的芯; 第一包层; 第二覆层; 和第三覆层。 芯的最大折射率大于第一包层，第二包层和第三包层的最大折射率中的任何一个，并且第二包层的最大折射率小于任何最大折射率 第一和第三包层的指数。 此外，2×2 / a <1的比例不小于约2.5且不大于约4.5，其中1表示芯的半径，而2 表示第一包层的外周的半径，芯相对于第三包层的最大折射率的相对折射率差为0.20％以上且0.70％以下。

    Optical fiber and optical transmission path
    6.
    发明授权
    Optical fiber and optical transmission path 有权
    光纤和光传输路径

    公开(公告)号：US07062136B2

    公开(公告)日：2006-06-13

    申请号：US10440263

    申请日：2003-05-19

    申请人： Shoji Tanigawa ,  Shoichiro Matsuo ,  Kuniharu Himeno ,  Koichi Harada

    发明人： Shoji Tanigawa ,  Shoichiro Matsuo ,  Kuniharu Himeno ,  Koichi Harada

    IPC分类号： G02B6/22

    CPC分类号： G02B6/03694 ,  G02B6/02247 ,  G02B6/02285 ,  G02B6/03611 ,  G02B6/03627 ,  G02B6/03644 ,  G02B6/03666 ,  G02B6/29377

    摘要： Under condition that a non-circularity ratio is 5% or lower and a thermal expansion coefficient of a glass which forms the core is α1 and a thermal expansion of a glass which forms the cladding is α2, the difference of coefficients is controlled such that a formula −2.5×10−7/° C.≦α1 −α2≦1.0×10−7/° C. is satisfied so as to maintain a polarization mode dispersion to be 0.03 ps/km0.5 or lower. The difference of coefficients is further controlled such that a formula −1.5×10−7/° C.≦α1−α2≦0/° C. is satisfied so as to maintain a polarization mode dispersion to be 0.015 ps/km0.5 or lower. By doing this, birefringence is reduced by adjusting the thermal expansion coefficient in a core and a cladding; thus providing an optical fiber, and an optical transmission path using the optical fiber, having preferable PMD for high speed transmission.

    摘要翻译： 在非圆度比为5％以下，形成芯的玻璃的热膨胀系数为α1，形成包层的玻璃的热膨胀为α2的条件下，将系数差控制为 满足公式-2.5×10 -7 /℃。<=α1 -al 2≤1.0×10 -7 -7℃/℃以保持极化 模式色散为0.03ps / km <0.5或更低。 进一步控制系数的差异，使得满足式-1.5×10 -7 /℃。=α1-α2 <= 0 /℃，以便保持偏振模色散 为0.015ps / km以下0.5以下。 通过这样做，通过调节芯和包层中的热膨胀系数来减少双折射; 从而提供一种光纤，以及使用该光纤的光传输路径，具有优选用于高速传输的PMD。

    Optical fiber
    7.
    发明申请
    Optical fiber 有权
    光纤

    公开(公告)号：US20060039665A1

    公开(公告)日：2006-02-23

    申请号：US11244195

    申请日：2005-10-06

    申请人： Shoichiro Matsuo ,  Kuniharu Himeno ,  Koichi Harada ,  Masataka Ikeda

    发明人： Shoichiro Matsuo ,  Kuniharu Himeno ,  Koichi Harada ,  Masataka Ikeda

    IPC分类号： G02B6/036

    CPC分类号： G02B6/02009 ,  G02B6/0365 ,  G02B6/03672 ,  G02B6/03688

    摘要： An optical fiber includes: a core at a center; a first cladding layer; a second cladding layer; and a third cladding layer. A maximum refractive index of the core is greater than any of maximum refractive indices of the first cladding layer, the second cladding layer, and the third cladding layer, and the maximum refractive index of the second cladding layer is smaller than any of the maximum refractive indices of the first and the third cladding layer. Additionally, a ratio of a2/a1 is not less than about 2.5 and not more than about 4.5, where a1 represents the radius of the core, and a2 represents the radius of an outer periphery of the first cladding layer, and a relative refractive index difference of the core with respect to a maximum refractive index of the third cladding layer is not less than 0.20% and not more than 0.70%.

    摘要翻译： 光纤包括：中心的芯; 第一包层; 第二覆层; 和第三覆层。 芯的最大折射率大于第一包层，第二包层和第三包层的最大折射率中的任何一个，并且第二包层的最大折射率小于任何最大折射率 第一和第三包层的指数。 此外，2×2 / a <1的比例不小于约2.5且不大于约4.5，其中1表示芯的半径，而2 表示第一包层的外周的半径，芯相对于第三包层的最大折射率的相对折射率差为0.20％以上且0.70％以下。

    Single-mode optical fiber and composite optical line
    10.
    发明授权
    Single-mode optical fiber and composite optical line 失效
    单模光纤和复合光线

    公开(公告)号：US06895140B2

    公开(公告)日：2005-05-17

    申请号：US10270577

    申请日：2002-10-16

    申请人： Shoichiro Matsuo ,  Kuniharu Himeno ,  Koichi Harada

    发明人： Shoichiro Matsuo ,  Kuniharu Himeno ,  Koichi Harada

    IPC分类号： G02B6/036 ,  H04J14/02 ,  G02B5/172

    CPC分类号： G02B6/02242 ,  G02B6/02004 ,  G02B6/03644

    摘要： A single-mode optical fiber has a core and a cladding, and is produced in such a way that, when the radii of layers having individual refractive indexes are varied, more than one optical properties of the core, for example, the effective core area Aeff and the dispersion slope exhibit respective limiting values within a specific range of a reference radius. Such optical fibers provide basically the same optical properties but enable to vary the chromatic dispersion within a specific range so that the single-mode optical fiber is ideally suited for use in high-speed and large capacity communication systems.

    摘要翻译： 单模光纤具有芯和包层，并且以这样的方式制造，当具有各自折射率的层的半径变化时，芯的多于一个的光学性质，例如有效核心区域 色散斜率在参考半径的特定范围内显示相应的限制值。 这种光纤提供基本上相同的光学性能，但是能够将色散改变在特定范围内，使得单模光纤理想地适用于高速和大容量通信系统。