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    Optical fiber and optical transmission system
    1.
    发明授权
    Optical fiber and optical transmission system 有权
    光纤和光传输系统

    公开(公告)号：US07076139B1

    公开(公告)日：2006-07-11

    申请号：US09635109

    申请日：2000-08-09

    申请人： Kazuhiko Aikawa ,  Takashi Suzuki ,  Akira Wada ,  Ryozo Yamauchi ,  Takaaki Suzuki ,  Shoichiro Matsuo ,  Manabu Saitou

    发明人： Kazuhiko Aikawa ,  Takashi Suzuki ,  Akira Wada ,  Ryozo Yamauchi ,  Takaaki Suzuki ,  Shoichiro Matsuo ,  Manabu Saitou

    IPC分类号： G02B6/02

    CPC分类号： G02B6/03644 ,  G02B6/02019 ,  G02B6/02238 ,  G02B6/02261 ,  G02B6/02266 ,  G02B6/03627 ,  G02B6/29377 ,  G02B6/29394 ,  H04B10/2525

    摘要： An optical fiber is fabricated with a refractive index profile having a central core; a middle part provided around the outer periphery of the central core and having a lower refractive index than that of the central core; and a cladding provided around the periphery of the middle part and having a higher refractive index than the middle part and a lower refractive index than the central core. This optical fiber has an effective core area of 120 μm2 or more in an employed wavelength band selected from the range of 1.53˜1.63 μm, and has a cut-off wavelength that is capable of substantially single mode propagation in the aforementioned employed wavelength band. As a result, it is possible to construct an optical transmission system having excellent transmission characteristics in which nonlinearity is decreased.

    摘要翻译： 制造具有中心芯的折射率分布的光纤; 中间部分围绕中心芯的外周设置，折射率低于中心芯的折射率; 以及围绕中间部分的周边设置并且具有比中间部分更高的折射率和比中心芯部更低的折射率的包层。 该光纤在选自1.53〜1.63μm范围内的使用波长带中具有120m 2以上的有效核心面积，并且具有能够基本上单模的截止波长 在上述使用的波长带中的传播。 结果，可以构成具有优异的非线性降低的传输特性的光传输系统。

    Dispersion-compensating optical fiber and hybrid transmission line
    2.
    发明授权
    Dispersion-compensating optical fiber and hybrid transmission line 失效
    色散补偿光纤和混合传输线

    公开(公告)号：US06980723B2

    公开(公告)日：2005-12-27

    申请号：US10866421

    申请日：2004-06-11

    申请人： Kazuhiko Aikawa ,  Manabu Saitou ,  Takaaki Suzuki ,  Shoichiro Matsuo ,  Takashi Suzuki ,  Koichi Harada ,  Akira Wada

    发明人： Kazuhiko Aikawa ,  Manabu Saitou ,  Takaaki Suzuki ,  Shoichiro Matsuo ,  Takashi Suzuki ,  Koichi Harada ,  Akira Wada

    IPC分类号： G02B6/02 ,  G02B6/22 ,  G02B6/16

    CPC分类号： G02B6/02009 ,  G02B6/02228 ,  G02B6/02261 ,  G02B6/0228 ,  G02B6/03627 ,  G02B6/03644 ,  G02B6/03666

    摘要： In order to provide a dispersion-compensating optical fiber able to be applied over a broad wavelength band, having a large effective area, and as a result, suppressing the occurrence of non-linear effects, the present invention comprises a dispersion-compensating optical fiber that compensates chromatic dispersion of a 1.3 μm single-mode optical fiber over the entire wavelength range of 1.53-1.63 μm characterized in that, chromatic dispersion at a wavelength of 1.55 μm is −50 ps/nm/km or less, the dispersion slope is negative over the entire wavelength range of 1.53-1.63 μm, a cutoff wavelength is provided at which there is substantially single-mode propagation, bending loss is 30 dB/m or less, effective area is 20 μm2 or more, and the absolute value of chromatic dispersion during compensation of the chromatic dispersion of a 1.3 μm single-mode optical fiber serving as the target of compensation is 0.5 ps/nm/km or less.

    摘要翻译： 为了提供能够在宽波长带上施加的具有大的有效面积的色散补偿光纤，结果抑制非线性效应的发生，本发明包括色散补偿光纤 其在1.53-1.63μm的整个波长范围内补偿1.3μm单模光纤的色散，其特征在于，在1.55μm波长的色散为-50ps / nm / km或更小，色散斜率为 在1.53-1.63μm的整个波长范围内为负，提供截止波长，其中基本上单模传播，弯曲损耗为30dB / m以下，有效面积为20mum 2 以上，补偿作为补偿对象的1.3μm单模光纤的色散补偿期间的色散的绝对值为0.5ps / nm / km以下。

    Multimode optical fiber with a higher order mode removing function
    5.
    发明授权
    Multimode optical fiber with a higher order mode removing function 有权
    具有更高阶模式去除功能的多模光纤

    公开(公告)号：US06535678B1

    公开(公告)日：2003-03-18

    申请号：US09701399

    申请日：2000-11-28

    申请人： Ryozo Yamauchi ,  Tomio Abiru ,  Shoichiro Matsuo ,  Koichi Takahashi

    发明人： Ryozo Yamauchi ,  Tomio Abiru ,  Shoichiro Matsuo ,  Koichi Takahashi

    IPC分类号： G02B602

    CPC分类号： G02B6/03666 ,  G02B6/02019 ,  G02B6/021 ,  G02B6/02138 ,  G02B6/02271 ,  G02B6/03611 ,  G02B6/03633 ,  G02B6/03644 ,  G02B6/0365 ,  G02B6/14

    摘要： The present invention's multimode optical fiber is characterized in that the propagating modes include a mode the lowest and second or higher order modes; and the difference between the propagation constants of the lowest order mode and the second order mode is 2-fold or more than the difference between the propagation constants of adjacent modes that are second order or higher order modes. Due to this design, single mode propagation becomes possible once the modes have propagated over a specific distance. As a result, it is possible to relax the conventional single mode conditions, enabling the fiber parameters to be set relatively freely.

    摘要翻译： 本发明的多模光纤的特征在于，传播模式包括最低和第二或更高阶模式的模式; 并且最低阶模式和第二阶模式的传播常数之间的差异是作为二阶或更高阶模式的相邻模式的传播常数之间的差异的2倍或更多。 由于这种设计，一旦模式在特定距离上传播，单模传播就变得可能。 结果，可以放松常规的单模式条件，使光纤参数相对自由地设定。

    Method of measuring cut-off wavelength of optical fiber
    8.
    发明授权
    Method of measuring cut-off wavelength of optical fiber 有权
    测量光纤截止波长的方法

    公开(公告)号：US08896822B2

    公开(公告)日：2014-11-25

    申请号：US13440757

    申请日：2012-04-05

    申请人： Yasuko Sugimoto ,  Shoichiro Matsuo

    发明人： Yasuko Sugimoto ,  Shoichiro Matsuo

    IPC分类号： G01N21/00 ,  G01N21/84 ,  G02B6/02

    CPC分类号： G01N21/84 ,  G01M11/33 ,  G02B6/02

    摘要： A cut-off wavelength measuring method according to the present invention includes: preparing a single mode fiber as a reference fiber; preparing a measurement target fiber; adjusting the length of the single mode fiber such that the length of the single mode fiber is longer than the that of the measurement target fiber at the time of measuring power of transmission light and the reference fiber propagates only light of a base mode at a predicted cut-off wavelength of the measurement target fiber; measuring wavelength dependence of power of light transmitted through the reference fiber and wavelength dependence of power of light transmitted through the measurement target fiber; and calculating a cut-off wavelength of the measurement target fiber based on wavelength dependence represented as the ratio of the power of transmission light transmitted through the measurement target fiber to the power of light transmitted through the reference fiber.

    摘要翻译： 根据本发明的截止波长测量方法包括：制备单模光纤作为参考光纤; 准备测量目标纤维; 调整单模光纤的长度，使得在测量透射光的功率时单模光纤的长度比测量目标光纤的长度长，并且参考光纤仅传播预测的基模的光 测量目标光纤的截止波长; 测量通过参考光纤传输的光的功率的波长依赖性和透射通过测量目标光纤的光的功率的波长依赖性; 并且基于表示为透射通过测量目标光纤的透射光的功率与通过参考光纤透射的光的功率的比率的波长依赖性来计算测量目标光纤的截止波长。

    Optical fiber and transmission system, and wavelength division multiplexing system
    9.
    发明授权
    Optical fiber and transmission system, and wavelength division multiplexing system 有权
    光纤和传输系统以及波分复用系统

    公开(公告)号：US07606460B2

    公开(公告)日：2009-10-20

    申请号：US11738275

    申请日：2007-04-20

    申请人： Shoichiro Matsuo ,  Shoji Tanigawa ,  Kuniharu Himeno

    发明人： Shoichiro Matsuo ,  Shoji Tanigawa ,  Kuniharu Himeno

    IPC分类号： G02B6/00

    CPC分类号： G02B6/03611 ,  G02B6/03627 ,  G02B6/03633 ,  G02B6/03644 ,  G02B6/0365

    摘要： An optical fiber comprises a center core and a cladding located at an outer periphery of the core, wherein the core comprises at least one codoped layer made from silica glass doped with germanium and fluorine, and at least one lower-concentration codoped layer made from silica glass doped with germanium, or silica glass that is doped with germanium and fluorine wherein an amount of fluorine in the lower-concentration codoped layer is smaller than an amount of fluorine in the codoped layer.

    摘要翻译： 光纤包括位于芯的外周的中心芯和包层，其中芯包括由掺杂有锗和氟的二氧化硅玻璃制成的至少一个共掺层，以及由二氧化硅制成的至少一个低浓度共掺层 掺杂有锗的玻璃或掺杂有锗和氟的二氧化硅玻璃，其中低浓度掺杂层中的氟的量小于共掺层中的氟的量。