公开(公告)号：US4913521A

公开(公告)日：1990-04-03

申请号：US279022

申请日：1988-12-02

申请人： Katsusuke Tajima ,  Yutaka Sasaki ,  Masaharu Ohashi ,  Makoto Tsubokawa ,  Nobuo Kuwaki

发明人： Katsusuke Tajima ,  Yutaka Sasaki ,  Masaharu Ohashi ,  Makoto Tsubokawa ,  Nobuo Kuwaki

IPC分类号： G02B6/024 ,  G02B6/10

CPC分类号： G02B6/105 ,  G01L1/242

摘要： A single-polarization optical fiber comprising a core, an inner cladding surrounding the core, an outer cladding surrounding the inner cladding and at least one pair of stress-applying portions each of which are partially extended into both the inner and outer claddings and which are symmetrical about the axis of the core and having thermal expansion coefficient higher than those of both the inner and outer claddings. When the refractive index of the stress-applying portions is lower than that of the core and higher than that of the inner cladding and further not higher than that of the outer cladding, one of orthogonally polarized mode is cutoff and only one polarized mode can propagate in the optical fiber.

公开(公告)号：US4755022A

公开(公告)日：1988-07-05

申请号：US901619

申请日：1986-08-29

申请人： Masaharu Ohashi ,  Nobuo Kuwaki ,  Shigeyuki Seikai ,  Naoshi Uesugi ,  Chihaya Tanaka

发明人： Masaharu Ohashi ,  Nobuo Kuwaki ,  Shigeyuki Seikai ,  Naoshi Uesugi ,  Chihaya Tanaka

IPC分类号： G02B6/028 ,  G02B6/02 ,  G02B6/036 ,  G02B6/22

CPC分类号： G02B6/0281 ,  G02B6/02276 ,  G02B6/03633 ,  G02B6/02004

摘要： A 1.5 .mu.m zero dispersion single mode optical fiber comprising a center core, a side core disposed on an outer side of the center core and having a refractive index lower than that of the center core, and a cladding portion disposed on an outer side of the side core. Each of the refractive indices of the center core and the side core has a step-like profile in the direction of the radius of the optical fiber. The bending loss is low. The mode field diameter can be increased without deteriorating the bending loss, and the splice loss can be reduced. The chromatic dispersion varies only to a small extent with respect to changes in the core diameter, so that the zero dispersion wavelength can be well controlled.

摘要翻译： 一种1.5μm的零色散单模光纤，包括中心芯，设置在中心芯的外侧上的折射率低于中心芯的折射率的侧芯，以及设置在中心芯的外侧的包层部分 侧核。 中心纤芯和侧芯的每个折射率在光纤的半径方向上具有阶梯状轮廓。 弯曲损耗低。 可以在不降低弯曲损耗的情况下增加模场直径，并且可以减少接头损耗。 相对于纤芯直径的变化，色散仅有很小程度的变化，从而可以很好地控制零色散波长。

公开(公告)号：US5357362A

公开(公告)日：1994-10-18

申请号：US59467

申请日：1993-05-07

申请人： Yuji Azuma ,  Yoshihiro Shibata ,  Shinji Tamura ,  Nobuo Kuwaki ,  Nobuhiro Ikawa ,  Akira Fukuda ,  Akio Kuwahara

发明人： Yuji Azuma ,  Yoshihiro Shibata ,  Shinji Tamura ,  Nobuo Kuwaki ,  Nobuhiro Ikawa ,  Akira Fukuda ,  Akio Kuwahara

IPC分类号： G02B6/28 ,  G02B26/02 ,  H04B10/155 ,  H04B10/213 ,  H04B10/12 ,  G02B6/26 ,  H04B10/04

CPC分类号： H04B10/505 ,  G02B26/02 ,  G02B6/2852

摘要： An optical modulation method operable in an optical transmission path using an optical fiber, wherein an optical fiber bending region is formed by bending a portion of the optical fiber into a U shape having a predetermined bending width. A bending width set point is set in correspondence with a predetermined inclined portion of a characteristic curve representing a dependency ratio of insertion loss of light propagating in said optical fiber bending region relative to the bending width thereof, said predetermined inclined portion of said characteristic curve being located between a predetermined maximum and minimum portion thereof. Intensity modulation of light propagating in the optical fiber is performed using a signal to be transmitted by adjusting the bending width of the optical fiber bending region in correspondence with the signal to be transmitted with reference to the bending width set point as a center. An optical telephone uses an optical modulator including an optical fiber having a U-shaped bending region and a transducer for vibrating one straight portion of the optical fiber.

摘要翻译： 一种光学调制方法，其在使用光纤的光传输路径中可操作，其中通过将所述光纤的一部分弯曲成具有预定弯曲宽度的U形形成光纤弯曲区域。 弯曲宽度设定点对应于表示在所述光纤弯曲区域中传播的光的插入损耗相对于其弯曲宽度的依赖比的特性曲线的预定倾斜部分，所述特征曲线的所述预定倾斜部分为 位于其预定的最大和最小部分之间。 通过以相对于弯曲宽度设定点为中心的要发送的信号调整光纤弯曲区域的弯曲宽度，通过使用要发送的信号来进行在光纤中传播的光的强度调制。 光电话机使用包括具有U形弯曲区域的光纤的光学调制器和用于振动光纤的一个直线部分的换能器。

公开(公告)号：US5259045A

公开(公告)日：1993-11-02

申请号：US831562

申请日：1992-02-05

申请人： Yuji Azuma ,  Yoshihiro Shibata ,  Shinji Tamura ,  Nobuo Kuwaki ,  Nobuhiro Ikawa ,  Akira Fukuda ,  Akio Kuwahara

发明人： Yuji Azuma ,  Yoshihiro Shibata ,  Shinji Tamura ,  Nobuo Kuwaki ,  Nobuhiro Ikawa ,  Akira Fukuda ,  Akio Kuwahara

IPC分类号： G02B6/28 ,  G02B26/02 ,  H04B10/155 ,  H04B10/213 ,  G02B6/26

CPC分类号： H04B10/505 ,  G02B26/02 ,  G02B6/2852

摘要： An optical modulation method operable in an optical transmission path using an optical fiber, wherein an optical fiber bending region is formed by bending a portion of the optical fiber into a U shape having a predetermined bending width. A bending width set point is set in correspondence with a predetermined inclined portion of a characteristic curve representing a dependency ratio of insertion loss of light propagating in said optical fiber bending region relative to the bending width thereof, said predetermined inclined portion of said characteristic curve being located between a predetermined maximum and minimum portion thereof. Intensity modulation of light propagating in the optical fiber is performed using a signal to be transmitted by adjusting the bending width of the optical fiber bending region in correspondence with the signal to be transmitted with reference to the bending width set point as a center.

摘要翻译： 一种光学调制方法，其在使用光纤的光传输路径中可操作，其中通过将所述光纤的一部分弯曲成具有预定弯曲宽度的U形形成光纤弯曲区域。 弯曲宽度设定点对应于表示在所述光纤弯曲区域中传播的光的插入损耗相对于其弯曲宽度的依赖比的特性曲线的预定倾斜部分，所述特征曲线的所述预定倾斜部分为 位于其预定的最大和最小部分之间。 通过以相对于弯曲宽度设定点为中心的要发送的信号调整光纤弯曲区域的弯曲宽度，通过使用要发送的信号来进行在光纤中传播的光的强度调制。