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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
    8.
    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。

    Polarized wave holding optical fiber, production method therefor, connection method therefor, optical amplifier, laser oscillator and polarized wave holding optical fiber coupler
    9.
    发明授权
    Polarized wave holding optical fiber, production method therefor, connection method therefor, optical amplifier, laser oscillator and polarized wave holding optical fiber coupler 失效
    极化波保持光纤，其制造方法，其连接方法，光放大器，激光振荡器和偏振波保持光纤耦合器

    公开(公告)号：US5689578A

    公开(公告)日：1997-11-18

    申请号：US318848

    申请日：1994-10-25

    申请人： Ryozo Yamauchi ,  Kuniharu Himeno ,  Minoru Sawada ,  Fumio Suzuki ,  Kazuhiko Aikawa ,  Tetsuo Nozawa ,  Shigefumi Yamasaki

    发明人： Ryozo Yamauchi ,  Kuniharu Himeno ,  Minoru Sawada ,  Fumio Suzuki ,  Kazuhiko Aikawa ,  Tetsuo Nozawa ,  Shigefumi Yamasaki

    IPC分类号： C03B37/012 ,  G02B6/10 ,  G02B6/255 ,  G02B6/28 ,  G02B6/34 ,  H01S3/067

    CPC分类号： G02B6/024 ,  C03B37/01217 ,  C03B37/01222 ,  G02B6/02042 ,  G02B6/2843 ,  H01S3/06708 ,  C03B2201/31 ,  C03B2201/36 ,  C03B2203/02 ,  C03B2203/12 ,  C03B2203/22 ,  C03B2203/30 ,  C03B2203/31 ,  C03B2203/34 ,  G02B6/2551 ,  G02B6/2552

    摘要： The polarization-maintaining optical fiber 10 of the present invention is designed so that a plurality of core portions 12a,12b which have a high refractive index is provided in parallel along a single diameter direction in the cross section of the optical fiber, these core portions 12a,12b cooperating to propagate a single fundamental mode. In the production method for the polarization-maintaining optical fiber of the present invention, a plurality of holes 22 are formed longitudinally in parallel along a single diameter direction of a glass rod 21 having a low refractive index which forms the cladding, glass rods 23 for core use having a high refractive index which form the core portions are inserted into these holes 22, heating to form a unitary body is carried out, creating a preform which is then drawn. Further, the rare-earth-doped polarization-maintaining optical fiber of the present invention uses a rare earth element to dope the optical waveguide portion of the polarization-maintaining optical fiber, and can be employed in a light amplifier or laser oscillator. Moreover, the polarization-maintaining optical fiber coupler of the present invention is formed by bringing two or more polarization maintaining optical fibers into contact, heating, fusing and elongating them, and heating the vicinity of the connection point before and after connection.

    摘要翻译： PCT No.PCT / JP94 / 00300 Sec。 371日期：1994年10月25日 102（e）日期1994年10月25日PCT 1994年2月24日PCT PCT。 第WO94 / 17714号公报 日期1994年9月1日本发明的偏振波保持光纤10被设计成使得在光学部件的横截面中沿着单一直径方向平行设置多个具有高折射率的芯部12a，12b 光纤，这些芯部分12a，12b协作传播单个基本模式。 在本发明的偏振波保持光纤的制造方法中，多个孔22沿着形成包层的折射率低的玻璃棒21的单一直径方向纵向平行地形成，玻璃棒23用于 形成芯部的具有高折射率的芯用途被插入到这些孔22中，进行加热以形成整体，形成预先形成的预成型体。 此外，本发明的稀土掺杂偏振保持光纤使用稀土元素来掺杂保偏光纤的光波导部分，并且可以用在光放大器或激光振荡器中。 此外，本发明的偏振保持光纤耦合器是通过使两个或更多个保偏光纤接触，加热，熔化和拉伸，以及在连接之前和之后加热连接点附近而形成的。

    Joint loss minimizing connection structure for dispersion compensating optical fiber
    10.
    发明授权
    Joint loss minimizing connection structure for dispersion compensating optical fiber 失效
    联合损耗最小化色散补偿光纤的连接结构

    公开(公告)号：US07036995B2

    公开(公告)日：2006-05-02

    申请号：US10950304

    申请日：2004-09-23

    申请人： Takaaki Suzuki ,  Shogo Shimizu ,  Kazuhiko Aikawa ,  Kuniharu Himeno

    发明人： Takaaki Suzuki ,  Shogo Shimizu ,  Kazuhiko Aikawa ,  Kuniharu Himeno

    IPC分类号： G02B6/38 ,  G02B6/255 ,  G02B6/02 ,  G02B6/22

    CPC分类号： G02B6/02261 ,  G02B6/03627 ,  G02B6/03644 ,  G02B6/0365 ,  G02B6/2552

    摘要： In fusion-splicing a dispersion compensating optical fiber having a negative dispersion slope, with a connection optical fiber having a different near field pattern from that of the dispersion compensating optical fiber, if for the connection optical fiber, one is selected such that a theoretical joint loss in a used wavelength, obtained from an overlap integral of a near field pattern of the dispersion compensating optical fiber after fusion splicing and a near field pattern of the connection optical fiber after fusion splicing is presumed to be 0.3 dB or less, in an unconnected state, a construction enabling connection at a low loss results.

    摘要翻译： 在使用具有与色散补偿光纤不同的近场图案的连接光纤熔接具有负色散斜率的色散补偿光纤时，如果对于连接光纤，选择一个理论接头 在熔接后的色散补偿光纤的近场图案与熔接后的连接光纤的近场图案的重叠积分中获得的使用波长的损失在未连接的情况下被推定为0.3dB以下 状态，一种能够以低损失结果实现连接的结构。