公开(公告)号：US5848208A

公开(公告)日：1998-12-08

申请号：US893145

申请日：1997-07-15

申请人： Fumio Suzuki ,  Hideki Sasaki ,  Shigefumi Yamasaki ,  Tomio Abiru ,  Ryozo Yamauchi

发明人： Fumio Suzuki ,  Hideki Sasaki ,  Shigefumi Yamasaki ,  Tomio Abiru ,  Ryozo Yamauchi

IPC分类号： G02B6/28 ,  G02B6/26

CPC分类号： G02B6/2835

摘要： In an optical-fiber coupler formed by disposing two single-mode optical fibers 1 and 2 in parallel, and fusing and elongating the optical fibers at one position in the longitudinal extent of the optical fibers 1 and 2, variation of insertion loss dependent on the polarization can be eliminated in its manufacturing by imparting a twist to the optical coupling part 3' of the fused-elongated portion 3 so that with respect to the direction of a line on a plane orthogonally intersecting the longitudinal direction of the optical fibers 1 and 2, the line linking the centers of the two optical fibers 1 and 2, the direction of the line on a plane at one end of the optical coupling part 3' of the fused-elongated portion 3 makes an angle of 90 degrees with the direction of the line on a plane at the other end of the optical coupling part 3'.

摘要翻译： 在通过平行设置两个单模光纤1和2而形成的光纤耦合器中，并且在光纤1和2的纵向范围内的一个位置处将光纤熔合和伸长，插入损耗的变化取决于 通过对熔融拉长部3的光耦合部3'施加扭曲，使得相对于与光纤1,2的纵向方向正交的平面上的线的方向，可以消除极化 连接两个光纤1和2的中心的线，在熔融拉长部分3的光耦合部分3'的一端的平面上的线的方向与90°的方向成为 在光耦合部分3'的另一端的平面上的线。

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。

公开(公告)号：US06546177B1

公开(公告)日：2003-04-08

申请号：US09830027

申请日：2001-04-20

申请人： Shoichiro Matsuo ,  Shoji Tanigawa ,  Tomio Abiru

发明人： Shoichiro Matsuo ,  Shoji Tanigawa ,  Tomio Abiru

IPC分类号： G02B602

CPC分类号： G02B6/03666 ,  C03B37/01413 ,  C03B37/01807 ,  C03B2201/02 ,  C03B2201/12 ,  C03B2201/31 ,  C03B2203/22 ,  C03B2203/36 ,  G02B6/02019 ,  G02B6/02238 ,  G02B6/03611 ,  G02B6/03633

摘要： In the present invention, by forming a dispersion shifted optical fiber that has a refractive index profile comprising: a central core portion 1; a step core portion 2 provided at an outer periphery of the central core portion 1 and having a refractive index lower than that of the central core portion 1; and cladding 7 provided at an outer periphery of the step core portion 2 and having a refractive index lower than that of the step core portion 2, and which dispersion shifted optical fiber has, in a used wavelength band that is selected from between 1490 and 1625 nm, chromatic dispersion values of 7 to 15 ps/km/nm, an Aeff of 60 to 150 &mgr;m2, a dispersion slope of 0.09 ps/km/nm2 or less, a bending loss of 100 dB/m or less, and a cutoff wavelength that provides essentially single mode transmission, it is possible to reduce the cost of the system and to achieve n improvement in the transmission characteristics.

摘要翻译： 在本发明中，通过形成具有折射率分布的色散位移光纤，包括：中心芯部分1; 设置在中心芯部1的外周并具有比中央芯部1的折射率低的折射率的台阶芯部2; 以及设置在台阶芯部2的外周并且折射率低于台阶芯部2的折射率的包层7，并且该色散位移光纤具有在从1490到1625之间的使用波长带中 nm，色散值为7〜15ps / km / nm，Aeff为60〜150mum2，色散斜率为0.09ps / km / nm2以下，弯曲损耗为100dB / m以下，截止频率为 提供基本单模传输的波长，可以降低系统的成本并实现传输特性的提高。

公开(公告)号：US06647190B2

公开(公告)日：2003-11-11

申请号：US09969673

申请日：2001-10-02

申请人： Shoichiro Matsuo ,  Tomio Abiru ,  Koichi Harada

发明人： Shoichiro Matsuo ,  Tomio Abiru ,  Koichi Harada

IPC分类号： G02B602

CPC分类号： G02B6/03661 ,  C03C13/045 ,  G02B6/02261 ,  G02B6/03611 ,  G02B6/03644

摘要： The present invention relates to an optical fiber having improved hydrogen-resistance properties. The optical fiber includes a high concentration germanium layer and a low concentration germanium layer. The high concentration germanium layer is disposed at a central position of the optical fiber and contains germanium oxide in a concentration of 0.1% by weight or more, relative to the total weight of the high concentration germanium layer. The low concentration germanium layer is disposed around the high concentration germanium layer and contains germanium oxide in a concentration of less than 0.1% by weight, relative to the total weight of the low concentration germanium layer. The ratio of optical power leaking from the high concentration germanium layer to the low concentration germanium layer in an employed wavelength band is 0.4% or less, relative to the total optical power propagating through the optical fiber.

摘要翻译： 本发明涉及具有改善的耐氢性能的光纤。 光纤包括高浓度锗层和低浓度锗层。 高浓度锗层设置在光纤的中心位置，相对于高浓度锗层的总重量，含有浓度为0.1重量％以上的氧化锗。 低浓度锗层设置在高浓度锗层周围，相对于低浓度锗层的总重量，含有浓度小于0.1重量％的氧化锗。 相对于通过光纤传播的总光功率，在所使用的波长带中从高浓度锗层泄漏到低浓度锗层的光功率的比率为0.4％以下。