公开(公告)号：US5087110A

公开(公告)日：1992-02-11

申请号：US381397

申请日：1989-07-06

申请人： Shinya Inagaki ,  Sakae Yoshizawa ,  Kazuya Sasaki

发明人： Shinya Inagaki ,  Sakae Yoshizawa ,  Kazuya Sasaki

IPC分类号： G02B6/44

CPC分类号： G02B6/4489 ,  G02B6/4407

摘要： The present invention relates to an optical fiber cable. In view of narrowing optical fiber cables, the spiral grooves to accommodate optical fiber cables are formed in the core loading material, in the longitudinal direction, by bundling high tensile strength synthetic resin fibers and covering the external circumference of the bundled material with a synthetic resin covering layer. Moreover, a method is disclosed for manufacturing an optical fiber cable which stably loads the optical fibers by holding the core loading material in order to eliminate deviation generated in the rotating direction around the core loading material on the occasion of loading fibers in the spiral grooves of core loading material.

摘要翻译： PCT No.PCT / JP89 / 00130 Sec。 371日期：1989年7月6日 102（e）日期1989年7月6日PCT 1990年2月9日PCT PCT。 出版物WO88 / 07779 日期：1989年8月24日。光纤电缆技术领域本发明涉及光纤电缆。 从缩小光纤电缆的角度出发，通过将高抗拉强度的合成树脂纤维捆扎，用合成树脂覆盖捆扎材料的外周，在芯装载材料中沿长度方向形成用于容纳光纤电缆的螺旋槽 覆盖层。 此外，公开了一种用于制造光纤电缆的方法，其通过保持芯装载材料来稳定地加载光纤，以便在将纤维加载到螺旋槽中时消除围绕芯装载材料的旋转方向产生的偏差 核心装载材料。

公开(公告)号：US5508842A

公开(公告)日：1996-04-16

申请号：US259133

申请日：1994-06-13

申请人： Keiko Takeda ,  Sakae Yoshizawa ,  Sinya Inagaki ,  Kazuya Sasaki ,  Kenji Tagawa

发明人： Keiko Takeda ,  Sakae Yoshizawa ,  Sinya Inagaki ,  Kazuya Sasaki ,  Kenji Tagawa

IPC分类号： H01S3/067 ,  H01S3/094 ,  H01S3/30 ,  G02B6/26

CPC分类号： H01S3/06708 ,  H01S3/094003 ,  H01S3/06745

摘要： In an optical amplifier for amplifying a signal light by propagating the signal light and a pumping light in a rare earth element doped fiber doped with a rare earth element, a diameter of a rare earth element doped portion of the rare earth element doped fiber is gradually reduced in a direction of propagation of the pumping light. With this construction, an adverse rare earth element doped area which does not contribute to optical amplification, but rather attenuates the pumping light, can be eliminated to thereby provide an optical amplifier having increased amplification efficiency.

摘要翻译： 在用于通过在稀土元素掺杂的稀土元素掺杂光纤中传播信号光和泵浦光来放大信号光的光放大器中，稀土元素掺杂光纤的稀土元素掺杂部分的直径逐渐地 在泵送光的传播方向上减小。 利用这种结构，可以消除不对光放大有贡献，而是衰减泵浦光的不利的稀土元素掺杂区域，从而提供具有增加的放大效率的光放大器。

公开(公告)号：US5077815A

公开(公告)日：1991-12-31

申请号：US411890

申请日：1989-09-25

申请人： Sakae Yoshizawa ,  Akihiko Ichikawa ,  Etsugo Yoneda ,  Shinya Inagaki ,  Kazuya Sasaki ,  Keiko Takeda

发明人： Sakae Yoshizawa ,  Akihiko Ichikawa ,  Etsugo Yoneda ,  Shinya Inagaki ,  Kazuya Sasaki ,  Keiko Takeda

IPC分类号： G02B6/14 ,  G02B6/255 ,  G02B6/26 ,  G02B6/32 ,  G02B6/38

CPC分类号： G02B6/2558 ,  G02B6/14 ,  G02B6/2551 ,  G02B6/262 ,  G02B6/32 ,  G02B6/3825 ,  G02B6/3833

摘要： An apparatus connects a single-mode optical fiber in a transmitting side to a multi-mode optical fiber in a receiving side without a deterioration of baseband transmission characteristics. The apparatus optically connects the single-mode fiber to the multi-mode fiber with an optical axes displacement therebetween, so that an optical signal to a multi-mode optical fiber from a single mode optical fiber is incident in a steady state mode including not only lower mode, but higher mode. In one embodiment, the optical axes displacement is achieved by axial displacement between the single-mode fiber and multi-mode fiber. In another embodiment, the optical axes displacement is achieved by an angle displacement between the single-mode fiber and multi-mode fiber.

公开(公告)号：US5136420A

公开(公告)日：1992-08-04

申请号：US541822

申请日：1990-06-21

申请人： Shinya Inagaki ,  Masayoshi Shigihara ,  Sakae Yoshizawa ,  Kazuya Sasaki ,  Keiko Takeda

发明人： Shinya Inagaki ,  Masayoshi Shigihara ,  Sakae Yoshizawa ,  Kazuya Sasaki ,  Keiko Takeda

IPC分类号： G02B6/255 ,  G02B6/28 ,  H01S3/094

CPC分类号： G02B6/2551 ,  G02B6/2835 ,  H01S3/094003 ,  H01S3/09408

摘要： An optical fiber amplifier is disclosed wherein pumping light and signal light are introduced into an optical fiber doped with a rare-earth element to directly amplify the signal light. The optical fiber amplifier of the invention comprises means constituted from a reflecting film, a fiber loop or the like for causing pumping light to pass by a plurality of times in the doped fiber. Due to the provision of the reflective film or the fiber loop, pumping light can be utilized efficiently, and the amplification factor of the optical fiber amplifier is improved.

公开(公告)号：US5007698A

公开(公告)日：1991-04-16

申请号：US567614

申请日：1990-08-15

申请人： Kazuya Sasaki ,  Sakae Yoshizawa ,  Shinya Inagaki ,  Keiko Takeda

发明人： Kazuya Sasaki ,  Sakae Yoshizawa ,  Shinya Inagaki ,  Keiko Takeda

IPC分类号： G02B6/28 ,  G02F1/35 ,  H01S3/06 ,  H01S3/063 ,  H01S3/17

CPC分类号： H01S3/063

摘要： An optical waveguide having a first cross section is thinned to constitute a thinned portion having a second cross section, as long as a predetermined length. Surface of the thinned portion is contacted with a laser glass member doped with a rare earth element, such as Er. Due to the thinned diameter, the optical fiber is optically coupled with the laser glass member. A pumping light is input to either into the optical waveguide together with a signal light or directly into the laser glass member. Signal light coupled from the thinned portion to the laser glass member is amplified by stimulated emission of the laser glass. Thus amplified signal light is coupled back to the thinned portion so as to propagate along the optical waveguide. The thinned portion can be as short as several centi-meters compared with ten meters to more than one hundred meters of conventional optical amplifier. In the optical waveguide where the pumping light is directly input to the laser glass member, the complicated multiplexer is not necessary, resulting in a reliable operation of the amplifier.