公开(公告)号：US5396569A

公开(公告)日：1995-03-07

申请号：US130354

申请日：1993-10-01

申请人： Hisaharu Yanagawa ,  Takeo Shimizu ,  Shiro Nakamura ,  Isao Ohyama ,  Izumi Sankawa

发明人： Hisaharu Yanagawa ,  Takeo Shimizu ,  Shiro Nakamura ,  Isao Ohyama ,  Izumi Sankawa

IPC分类号： G01M11/00 ,  G02B6/12 ,  G02B6/122 ,  G02B6/293 ,  H04B10/07 ,  H04B10/071 ,  H04B10/077 ,  H04B10/272 ,  G02B6/28 ,  H04J14/02

CPC分类号： H04B10/071 ,  G01M11/3136 ,  H04B10/07

摘要： An optical line monitoring method and an apparatus for locating a failure point in an optical communication system, wherein a plurality of types of inspection light rays having wavelengths which are determined by cut-off wavelengths, which differ from each other, of short-wavelength pass filters installed at a plurality of branched ports of an optical coupler/splitter of the communication system are sent from a light source having variable wavelengths into one or more corresponding optical fiber lines of the system in sequence via an optical directional coupler and the optical coupler/splitter. Each time reflected light, corresponding to the inspection light, from one or more optical fiber lines is received, an output representing the intensity level of the reflected light is sent from a light receiver to an arithmetic circuit and stored in the arithmetic circuit. The arithmetic circuit calculates the reflected light intensity levels which correspond to the individual optical fiber lines according to the light receiver outputs which individually correspond to inspection light rays, whereby the position of the failure in the optical fiber line incurring the failure is identified.

摘要翻译： 一种用于定位光通信系统中的故障点的光线监视方法和装置，其中具有短波长通过的彼此不同的截止波长确定的波长的多种类型的检查光线 安装在通信系统的光耦合器/分离器的多个分支端口处的滤波器从具有可变波长的光源经由光学定向耦合器和光耦合器/光耦合器顺序地发送到系统的一个或多个对应的光纤线路中， 分离器 每次接收到来自一个或多个光纤线路的反射光，对应于检查光的反射光，表示反射光的强度水平的输出从光接收器发送到运算电路并存储在运算电路中。 算术电路根据与检测光线分别对应的光接收器输出，计算与各个光纤线路对应的反射光强度水平，从而识别出导致故障的光纤线路中的故障位置。

公开(公告)号：US07228040B2

公开(公告)日：2007-06-05

申请号：US10523460

申请日：2004-03-30

申请人： Kazuhide Nakajima ,  Katsusuke Tajima ,  Jian Zhou ,  Izumi Sankawa ,  Kazuo Hogari

发明人： Kazuhide Nakajima ,  Katsusuke Tajima ,  Jian Zhou ,  Izumi Sankawa ,  Kazuo Hogari

IPC分类号： G02B6/032 ,  G02B6/02

CPC分类号： G02B6/02333 ,  G02B6/02019 ,  G02B6/02366 ,  G02B6/0365

摘要： A single mode fiber is provided which is suitable for high-speed, large-capacity optical communication and for optical wiring. The single mode fiber has a first cladding region with a uniform refractive index, a core region with a refractive index higher than that of the first cladding region, and a second cladding region including at least four air hole regions placed in the first cladding region. Optimization can be achieved by making the distance from the center of the core region to the air hole regions equal to 2–4.5 times the core radius, and the air hole radius equal to or greater than 0.2 times the core radius. It is preferable the core radius be 3.7–4.8 μm, the relative index difference of the core region from the first cladding region be 0.3–0.55 %.

摘要翻译： 提供单模光纤，适用于高速，大容量光通信和光布线。 单模光纤具有均匀的折射率的第一包层区域，具有比第一包层区域的折射率高的纤芯区域，以及包括设置在第一包层区域中的至少四个气孔区域的第二包层区域。 可以通过使芯部区域的中心到气孔区域的距离等于芯半径的2-4.5倍，空气孔半径等于或大于核心半径的0.2倍来实现优化。 芯部半径优选为3.7〜4.8μm，芯部区域与第一包层区域的相对折射率差为0.3〜0.55％。

公开(公告)号：US5430824A

公开(公告)日：1995-07-04

申请号：US104607

申请日：1993-08-11

申请人： Yoshiki Chigusa ,  Masashi Onishi ,  Takashi Kohgo ,  Minoru Watanabe ,  Izumi Sankawa

发明人： Yoshiki Chigusa ,  Masashi Onishi ,  Takashi Kohgo ,  Minoru Watanabe ,  Izumi Sankawa

IPC分类号： G02F1/35 ,  H01S3/06 ,  H01S3/063 ,  H01S3/067 ,  H01S3/07 ,  H01S3/0915 ,  H01S3/16 ,  H01S3/17 ,  G02B6/00

CPC分类号： H01S3/0632 ,  H01S3/063 ,  H01S3/06754 ,  H01S2302/00 ,  H01S2303/00 ,  H01S3/1613

摘要： An optically active device comprising an optical fiber, a light source and an optical device is disclosed. The optical fiber comprises a core made of an optical functioning glass doped with Pr.sup.3+ as an active ion and transmits light at a first wavelength. The light source generates excitation light at a second wavelength shorter than the first wavelength. The optical device directs the excitation light from the light source into the optical fiber. Then, Pr.sup.3+ in the core of the optical fiber is stimulated to emit light at the second wavelength. As a result, an optical function such as optical amplification can be effected at the second wavelength.

摘要翻译： 公开了一种包括光纤，光源和光学装置的光学器件。 光纤包括由掺杂有Pr 3+作为活性离子的光学功能玻璃制成的芯并透射第一波长的光。 光源产生比第一波长短的第二波长的激发光。 光学装置将来自光源的激发光引导到光纤中。 然后，光纤的核心中的Pr3 +被激发以发射第二波长的光。 结果，可以在第二波长处实现诸如光放大的光学功能。

公开(公告)号：US5422975A

公开(公告)日：1995-06-06

申请号：US159923

申请日：1993-12-01

申请人： Hiroo Kanamori ,  Akira Urano ,  Tomonori Kashiwara ,  Izumi Sankawa

发明人： Hiroo Kanamori ,  Akira Urano ,  Tomonori Kashiwara ,  Izumi Sankawa

IPC分类号： G02B6/00 ,  G02B6/02 ,  G02B6/34 ,  G02B6/22 ,  G02B6/24

CPC分类号： G02B6/02 ,  G02B6/29361

摘要： An object of this invention is to provide an optical filter which has higher mass-producibility and economy. This feature can be realized by doped a rare earth element into the region made of a glass material which can transmit light. In a case that Er and Tm are doped as the rare earth element into the region, a ratio .alpha..sub.Er /.alpha..sub.Tm between a contribution .alpha..sub.Er of Er to attenuation and a contribution .alpha..sub.Tm of Tm to attenuation is set in a range from about 1 to 1/25 for a 1.5 .mu.m band range, whereby attenuation in this wavelength range is retained above 50 dB/m to realize required cutoff function.

摘要翻译： 本发明的目的是提供一种具有更高的批量生产性和经济性的滤光器。 该特征可以通过将稀土元素掺杂到可透射光的玻璃材料制成的区域中来实现。 在将Er和Tm作为稀土元素掺杂到该区域中的情况下，Er与衰减的贡献αEr与Tm对衰减的贡献αTm之比αEr /αTm设定在从约 对于1.5μm的频带范围为1至1/25，由此在该波长范围内的衰减保持在50dB / m以上以实现所需的截止功能。

公开(公告)号：US20060045448A1

公开(公告)日：2006-03-02

申请号：US10523460

申请日：2004-03-30

申请人： Kazuhide Nakajima ,  Katsusuke Tajima ,  Jian Zhou ,  Izumi Sankawa ,  Kazuo Hogari

发明人： Kazuhide Nakajima ,  Katsusuke Tajima ,  Jian Zhou ,  Izumi Sankawa ,  Kazuo Hogari

IPC分类号： G02B6/032

CPC分类号： G02B6/02333 ,  G02B6/02019 ,  G02B6/02366 ,  G02B6/0365

摘要： A single mode fiber is provided which is suitable for high-speed, large-capacity optical communication and for optical wiring. The single mode fiber has a first cladding region with a uniform refractive index, a core region with a refractive index higher than that of the first cladding region, and a second cladding region including at least four air hole regions placed in the first cladding region. Optimization can be achieved by making the distance from the center of the core region to the air hole regions equal to 2-4.5 times the core radius, and the air hole radius equal to or greater than 0.2 times the core radius. It is preferable the core radius be 3.2-4.8 μm, the relative index difference of the core region from the first cladding region be 0.3-0.55%.

摘要翻译： 提供单模光纤，适用于高速，大容量光通信和光布线。 单模光纤具有均匀的折射率的第一包层区域，具有比第一包层区域的折射率高的纤芯区域，以及包括设置在第一包层区域中的至少四个气孔区域的第二包层区域。 可以通过使芯部区域的中心到气孔区域的距离等于芯半径的2-4.5倍，并且空气孔半径等于或大于核心半径的0.2倍来实现优化。 芯半径优选为3.2-4.8μm，芯区域与第一包层区域的相对折射率差为0.3-0.55％。

公开(公告)号：US5446810A

公开(公告)日：1995-08-29

申请号：US61105

申请日：1993-05-14

申请人： Tsutomu Watanabe ,  Kazuhito Saito ,  Kazumasa Ozawa ,  Shunichi Mizuno ,  Izumi Sankawa

发明人： Tsutomu Watanabe ,  Kazuhito Saito ,  Kazumasa Ozawa ,  Shunichi Mizuno ,  Izumi Sankawa

IPC分类号： G02B6/35 ,  G02B6/36 ,  G02B6/38 ,  G02B6/26

CPC分类号： G02B6/3676 ,  G02B6/3839 ,  G02B6/3885 ,  G02B6/3508 ,  G02B6/3556 ,  G02B6/3574 ,  G02B6/3636 ,  G02B6/3644 ,  G02B6/3652 ,  G02B6/3692 ,  G02B6/3696

摘要： The present invention relates to an optical switch comprising a fiber arranging member having a substrate 1 with a plurality of fiber fixing grooves formed in an upper surface thereof, first optical fibers 2 fixed in the fiber fixing grooves, and a convey mechanism 5 for conveying a second optical fiber 6 to be connected to a corresponding first optical fiber 2 to a corresponding fiber fixing groove, wherein fiber introduction grooves 1h for guiding the end portion of the second optical fiber 6 are formed at the end portions of the fiber fixing grooves that fix the end portions of the first optical fibers 2.

摘要翻译： 本发明涉及一种光开关，其包括具有基板1的光纤排列构件，该基板1在其上表面形成有多个光纤固定槽，第一光纤2固定在光纤固定槽中，以及传送机构5， 将第二光纤6连接到对应的第一光纤2到相应的光纤固定槽，其中在固定第二光纤6的端部的纤维固定槽的端部形成用于引导第二光纤6的端部的光纤引入槽1h， 第一光纤2的端部。

公开(公告)号：US5214728A

公开(公告)日：1993-05-25

申请号：US888474

申请日：1992-05-22

申请人： Masayuki Shigematsu ,  Kohji Nakazato ,  Izumi Sankawa

发明人： Masayuki Shigematsu ,  Kohji Nakazato ,  Izumi Sankawa

IPC分类号： H04B10/08 ,  H04B10/17 ,  H04B10/213

CPC分类号： H04B10/27 ,  H04B10/038 ,  H04B10/071 ,  H04B10/272 ,  H04B10/291 ,  H04B10/2912

摘要： A bi-directional optical communication system. A first optical fiber includes a plurality of pieces, each piece having a first and second end. An optical amplifier for amplifying optical signals transmitted in a first direction is coupled to first and second pieces of the first optical fiber. A second optical fiber is coupled to the first and second pieces, bypasses the optical amplifier and transmits optical signals in a second direction opposite to the first direction. A first optical signal generator apparatus coupled to the first piece of the first optical fiber provides optical signals propagating in the first direction to a optical receiver apparatus coupled to the second piece of the first optical fiber. A second optical signal generator in the optical receiver apparatus provides optical signals propagating in the second direction to the first optical signal generator apparatus. A second optical receiver and a monitor, both in the first optical signal generator apparatus, receive the optical signals propagating in the second direction and monitor various operating conditions of the optical communication system.

摘要翻译： 双向光通信系统。 第一光纤包括多个片，每片具有第一端和第二端。 用于放大沿第一方向传输的光信号的光放大器耦合到第一和第二片第一光纤。 第二光纤耦合到第一和第二片，绕过光放大器并沿与第一方向相反的第二方向传输光信号。 耦合到第一光纤的第一片的第一光信号发生器装置提供沿第一方向传播的光信号到耦合到第一光纤的第二片的光接收装置。 光接收装置中的第二光信号发生器提供沿第二方向传播的光信号到第一光信号发生装置。 在第一光信号发生器装置中的第二光接收器和监视器接收沿第二方向传播的光信号并监视光通信系统的各种操作状态。