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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。

    Dispersion compensating optical fiber
    4.
    发明授权
    Dispersion compensating optical fiber 失效
    色散补偿光纤

    公开(公告)号：US5995695A

    公开(公告)日：1999-11-30

    申请号：US59242

    申请日：1998-04-13

    申请人： Kazuhiko Aikawa ,  Akira Wada ,  Kuniharu Himeno ,  Ryozo Yamauchi

    发明人： Kazuhiko Aikawa ,  Akira Wada ,  Kuniharu Himeno ,  Ryozo Yamauchi

    IPC分类号： G02B6/02 ,  G02B6/036

    CPC分类号： G02B6/02261 ,  G02B6/0228 ,  G02B6/03627

    摘要： The present invention is related to an dispersion compensating optical fiber technology, comprising a central core, a middle part with a refractive index lower than this central core, and a cladding with a refractive index higher than said middle part and lower than said central core, characterized in: an outer diameter of said middle part being 2.5.about.3.5 times an outer diameter of said central core; a relative refractive index difference of said cladding to said middle part being -0.08.about.-0.2% with the refractive index of the cladding being zero; and having substantially single-mode transmission in the wavelength 1.55 .mu.m band, the chromatic dispersion being -80 ps/nm/km or less, the dispersion slope being +0.08 ps/nm.sup.2 /km or less, and the bending loss being 1.0 dB/m or less.

    摘要翻译： 本发明涉及一种色散补偿光纤技术，其包括中心纤芯，折射率低于该中心纤芯的中间部分和折射率高于所述中间部分且低于所述中心纤芯的包层， 其特征在于，所述中间部分的外径为所述中心芯的外径的2.5倍; 所述包层与所述中间部分的相对折射率差为包层折射率为零的-0.08差异-0.2％; 并且在1.55μm波长的波段中具有基本的单模传输，色散为-80ps / nm / km或更小，色散斜率为+0.08ps / nm2 / km或更小，弯曲损耗为1.0dB / m以下。

    Erbium-doped silica optical fiber preform
    5.
    发明授权
    Erbium-doped silica optical fiber preform 失效
    掺铒二氧化硅光纤预制棒

    公开(公告)号：US5526459A

    公开(公告)日：1996-06-11

    申请号：US402592

    申请日：1995-03-13

    申请人： Daiichirou Tanaka ,  Akira Wada ,  Tetsuya Sakai ,  Tetsuo Nozawa ,  Ryozo Yamauchi

    发明人： Daiichirou Tanaka ,  Akira Wada ,  Tetsuya Sakai ,  Tetsuo Nozawa ,  Ryozo Yamauchi

    IPC分类号： C03B8/04 ,  C03B20/00 ,  C03B37/014 ,  C03C13/04 ,  G02B6/00

    CPC分类号： C03B37/01433 ,  C03C13/045 ,  C03B2201/36

    摘要： A manufacturing method for erbium doped silica, having a soot formation process, in which a silica glass soot is deposited on a seed rod for forming a soot preform in a porous state on the seed rod, a dopant impregnation process, wherein the soot preform is impregnated with at least an erbium compound, and a preform formation process, wherein this soot preform impregnated with a dopant is heated and rendered transparent. The dopant impregnation process is provided with an operation in which the soot preform obtained in the soot formation process is dipped in a solution containing an erbium compound, an aluminum compound, and a phosphorus compound; this is then desiccated, and soot preform which is impregnated with the erbium compound, the aluminum compound, and the phosphorus compound is obtained.

    摘要翻译： 一种铒掺杂二氧化硅的制造方法，其具有烟炱形成方法，其中将硅石烟炱沉积在用于在种棒上形成多孔状态的烟炱预型体的种棒上，掺杂剂浸渍方法，其中所述烟炱预型体为 用至少铒化合物浸渍，以及预成型物形成工艺，其中浸渍有掺杂剂的该烟炱预制件被加热并变得透明。 掺杂剂浸渍方法具有将烟灰形成工艺中获得的烟灰预制件浸入含有铒化合物，铝化合物和磷化合物的溶液中的操作; 然后将其干燥，得到浸渍有铒化合物，铝化合物和磷化合物的烟炱预制品。

    Optical waveguide grating and production method therefor
    7.
    发明授权
    Optical waveguide grating and production method therefor 失效
    光波导光栅及其制作方法

    公开(公告)号：US5949934A

    公开(公告)日：1999-09-07

    申请号：US823629

    申请日：1997-03-26

    申请人： Kensuke Shima ,  Michihiro Nakai ,  Hiroshi Hidaka ,  Kuniharu Himeno ,  Satoshi Okude ,  Akira Wada ,  Masaaki Sudoh ,  Tetsuya Sakai ,  Takuya Ienaka ,  Ryozo Yamauchi

    发明人： Kensuke Shima ,  Michihiro Nakai ,  Hiroshi Hidaka ,  Kuniharu Himeno ,  Satoshi Okude ,  Akira Wada ,  Masaaki Sudoh ,  Tetsuya Sakai ,  Takuya Ienaka ,  Ryozo Yamauchi

    IPC分类号： G02B6/124 ,  G02B6/34

    CPC分类号： G02B6/124 ,  G02B6/021 ,  G02B6/0218 ,  G02B6/0219

    摘要： An optical waveguide grating with radiative mode-coupling properties, with exceptional stability and reliability as an optical component, wherein the central wavelength of the rejection band has a low temperature dependence, due to the use of silica glass doped with germanium and boron for the core. The rejection bandwidth can be narrowed without increasing the grating length by forming the radiative mode-coupled optical waveguide grating in an optical waveguide wherein the mean relative refractive index difference of the core is greater than that of optical communication waveguides. The rejection can be increased by reducing the occurrence of cases wherein propagation modes of the core coupled to cladding modes once again couple to the core in palnar optical waveguide gratings formed by making periodic changes in the waveguide structure along the direction of propagation of light in an optical waveguide having a cladding with a lower refractive index than the core surrounding the core, by making the thickness of the cladding at least thirteen times the thickness of the core.

    摘要翻译： 具有辐射模耦合特性的光波导光栅作为光学部件具有出色的稳定性和可靠性，其中由于使用掺杂有锗和硼的石英玻璃作为芯，所以抑制带的中心波长具有低的温度依赖性 。 可以通过在光波导中形成辐射模耦合光波导光栅而不增加光栅长度来减小抑制带宽，其中芯的平均相对折射率差大于光通信波导的平均相对折射率差。 可以通过减少与耦合到包层模式的芯的传播模式再次耦合到palnar光波导光栅中的芯的情况的发生的情况下，可以增加抑制，其通过沿着光的传播方向周期性地改变波导结构而形成 光波导具有通过使包层的厚度至少为芯的厚度的十三倍而具有比围绕芯的芯的折射率低的折射率的包层。

    Optical fiber grating and manufacturing method thereof
    8.
    发明授权
    Optical fiber grating and manufacturing method thereof 有权
    光纤光栅及其制造方法

    公开(公告)号：US06442313B2

    公开(公告)日：2002-08-27

    申请号：US09777085

    申请日：2001-02-05

    申请人： Ryozo Yamauchi ,  Akira Wada ,  Tetsuya Sakai ,  Nobuyuki Tanaka ,  Kensuke Shima ,  Kenji Nishide ,  Shigefumi Yamasaki

    发明人： Ryozo Yamauchi ,  Akira Wada ,  Tetsuya Sakai ,  Nobuyuki Tanaka ,  Kensuke Shima ,  Kenji Nishide ,  Shigefumi Yamasaki

    IPC分类号： G02B634

    CPC分类号： G02B6/02147 ,  G02B6/02095

    摘要： An optical fiber grating is manufactured by heating intermittently an optical fiber, provided with a core having residual stress in the longitudinal direction, softening a peripheral cladding of the core, and forming spatial periodical changes for the relative refractive index-difference between the core and the cladding, in the longitudinal direction of the aforementioned optical fiber by having the index of refraction of the core change, through the releasing of the aforementioned residual stress. As a result, an optical fiber grating and the manufacturing method thereof, which do not require expensive equipment and which exhibit high productivity, and furthermore a grating characteristic which is stable over time can be provided.

    摘要翻译： 光纤光栅通过间歇地加热设置有在纵向上具有残余应力的芯的光纤，软化芯的外围包层，并且形成芯与芯的相对折射率差的空间周期性变化 通过释放上述残余应力，通过使芯的折射率变化，在上述光纤的长度方向上包覆。 结果，可以提供不需要昂贵的设备并且表现出高生产率的光纤光栅及其制造方法，此外还可以提供一种随时间稳定的光栅特性。

    Method of making an optical waveguide grating with two dissimilar irradiating steps
    9.
    发明授权
    Method of making an optical waveguide grating with two dissimilar irradiating steps 失效
    制造具有两个不同辐射步骤的光波导光栅的方法

    公开(公告)号：US5996375A

    公开(公告)日：1999-12-07

    申请号：US837958

    申请日：1997-04-14

    申请人： Michihiro Nakai ,  Kensuke Shima ,  Hiroshi Hidaka ,  Satoshi Okude ,  Masaaki Sudoh ,  Tetsuya Sakai ,  Akira Wada ,  Ryozo Yamauchi

    发明人： Michihiro Nakai ,  Kensuke Shima ,  Hiroshi Hidaka ,  Satoshi Okude ,  Masaaki Sudoh ,  Tetsuya Sakai ,  Akira Wada ,  Ryozo Yamauchi

    IPC分类号： C03B37/10 ,  G02B5/18

    CPC分类号： G02B6/02142 ,  G02B6/02138 ,  G02B6/02152

    摘要： A method of producing an optical waveguide grating by exposure to light. An optical waveguide having a core composed of a material wherein the refractive index changes due to exposure to UV light is formed into an optical waveguide grating by applying a grating portion formation step wherein a grating portion is formed by irradiation with UV light at a predetermined spacing, and an overall exposure step after formation of the grating portion wherein the entire grating portion is irradiated with UV light. As a result, the effective refractive index of the grating portion is changed so as to allow the central wavelength to be adjusted without changing the rejection. Consequently, the grating properties can be precisely and easily controlled.

    摘要翻译： 一种通过曝光产生光波导光栅的方法。 具有由其中由于暴露于UV光而引起的折射率变化的材料的芯构成的光波导通过施加光栅部分形成步骤形成为光波导光栅，其中通过以预定间隔照射UV光形成光栅部分 ，并且在形成光栅部分之后的整体曝光步骤，其中整个光栅部分被UV光照射。 结果，改变了光栅部分的有效折射率，以便可以调节中心波长而不改变排斥。 因此，可以精确且容易地控制光栅特性。