公开(公告)号：US20080145049A1

公开(公告)日：2008-06-19

申请号：US12000249

申请日：2007-12-11

申请人： Yahei Koyamada

发明人： Yahei Koyamada

IPC分类号： H04B10/08

CPC分类号： G01M11/319

摘要： An apparatus for measuring the characteristics of an optical fiber is provided. An optical pulse generator generates, from a coherent light, first and second optical pulses having a time interval which is equal to or shorter tan a life time of an acoustic wave in the optical fiber. A detector couples the coherent light with a Brillouin backscattered light which includes first and second Brillouin backscattered lights belonging to the first and second optical pulses respectively, thereby generating an optical signal. The detector further converts the optical signal into an electrical signal. A signal processor takes the sum of the electrical signal and a delay electrical signal which is delayed from the electrical signal by a delay time corresponding to the time interval, thereby generating an interference signal, and finds the characteristics of the optical fiber based on the interference signal.

摘要翻译： 提供一种用于测量光纤特性的装置。 光脉冲发生器从相干光产生具有等于或短于光纤中声波寿命的时间间隔的第一和第二光脉冲。 检测器将相干光与布里渊背散射光耦合，所述布里渊背散射光分别包括属于第一和第二光脉冲的第一和第二布里渊背散射光，从而产生光信号。 检测器还将光信号转换为电信号。 信号处理器将电信号和从电信号延迟延迟时间的延迟电信号的和与时间间隔相对应，从而产生干扰信号，并且基于干扰找到光纤的特性 信号。

公开(公告)号：US07873273B2

公开(公告)日：2011-01-18

申请号：US12000249

申请日：2007-12-11

申请人： Yahei Koyamada

发明人： Yahei Koyamada

IPC分类号： H04B10/08

CPC分类号： G01M11/319

摘要： An apparatus for measuring the characteristics of an optical fiber is provided. An optical pulse generator generates, from a coherent light, first and second optical pulses having a time interval which is equal to or shorter tan a life time of an acoustic wave in the optical fiber. A detector couples the coherent light with a Brillouin backscattered light which includes first and second Brillouin backscattered lights belonging to the first and second optical pulses respectively, thereby generating an optical signal. The detector further converts the optical signal into an electrical signal. A signal processor takes the sum of the electrical signal and a delay electrical signal which is delayed from the electrical signal by a delay time corresponding to the time interval, thereby generating an interference signal, and finds the characteristics of the optical fiber based on the interference signal.

摘要翻译： 提供一种用于测量光纤特性的装置。 光脉冲发生器从相干光产生具有等于或短于光纤中声波寿命的时间间隔的第一和第二光脉冲。 检测器将相干光与布里渊背散射光耦合，所述布里渊背散射光分别包括属于第一和第二光脉冲的第一和第二布里渊背散射光，从而产生光信号。 检测器还将光信号转换为电信号。 信号处理器将电信号和从电信号延迟延迟时间的延迟电信号的和与时间间隔相对应，从而产生干扰信号，并且基于干扰找到光纤的特性 信号。

公开(公告)号：US5581389A

公开(公告)日：1996-12-03

申请号：US364204

申请日：1994-12-27

申请人： Tekken Lee ,  Nobunari Takeuchi ,  Haruyoshi Uchiyama ,  Kaoru Shimizu ,  Tsuneo Horiguchi ,  Yahei Koyamada

发明人： Tekken Lee ,  Nobunari Takeuchi ,  Haruyoshi Uchiyama ,  Kaoru Shimizu ,  Tsuneo Horiguchi ,  Yahei Koyamada

IPC分类号： G02F2/02 ,  H01S3/10 ,  H01S3/13 ,  H04B10/00 ,  H04J14/06

CPC分类号： H04B10/2572 ,  H01S3/1301 ,  H01S3/10

摘要： The present invention provides light frequency control apparatus comprising a light pulse signal generating mechanism for generating a light pulse signal of a standard frequency; a light frequency shifting mechanism for circulating this light pulse signal a predetermined number of times, delaying this light pulse signal at each cycle thereby sequentially shifting and outputting the aforementioned light pulse signal; an extracting mechanism for extracting a light pulse signal in the second half of a cycle from the output of the light frequency shifting mechanism; and a polarization control mechanism inserted into the light frequency shifting mechanism for controlling the angle of polarization of the light pulse signal circulating in the light frequency shifting mechanism based on the amount of attenuation of the light pulse signal outputted by the extracting mechanism.

摘要翻译： 本发明提供一种光频控制装置，其包括用于产生标准频率的光脉冲信号的光脉冲信号发生机构; 用于使该光脉冲信号循环预定次数的光频移位机构，在每个周期延迟该光脉冲信号，从而依次移位并输出上述光脉冲信号; 提取机构，用于从光频移位机构的输出端提取周期的后半部分的光脉冲信号; 以及偏振控制机构，其插入到所述光频移动机构中，用于基于由所述提取机构输出的所述光脉冲信号的衰减量来控制在所述光频移动机构中循环的所述光脉冲信号的偏振角。

公开(公告)号：US07742671B2

公开(公告)日：2010-06-22

申请号：US12196429

申请日：2008-08-22

申请人： Yahei Koyamada ,  Katsunori Imamura

发明人： Yahei Koyamada ,  Katsunori Imamura

IPC分类号： G02B6/02

CPC分类号： G02B6/03638 ,  G02B6/02019 ,  G02B6/02266

摘要： A silica-based optical fiber includes a core and a cladding that is formed on an outer circumference of the core. The core includes three or more layers including a layer doped with at least one of germanium and fluorine, and a concentration of the germanium or the fluorine in each of the layers is controlled in such a manner that a Brillouin gain spectral peak is spread into a plurality of peaks on a Brillouin gain spectrum. With this scheme, an optical fiber is provided, which has stable characteristics in the longitudinal direction, and which has a high SBS threshold so that generation of the SBS can be effectively suppressed.

摘要翻译： 二氧化硅基光纤包括形成在芯的外圆周上的芯和包层。 芯包括三层或更多层，包括掺杂有锗和氟中的至少一种的层，并且以这样的方式控制每层中的锗或氟的浓度，使得布里渊增益光谱峰扩散到 布里渊增益谱上的多个峰。 通过该方案，提供了在纵向上具有稳定特性并且具有高SBS阈值的光纤，从而可以有效地抑制SBS的产生。

公开(公告)号：US5500762A

公开(公告)日：1996-03-19

申请号：US364327

申请日：1994-12-27

申请人： Haruyoshi Uchiyama ,  Tekken Lee ,  Nobunari Takeuchi ,  Kaoru Shimizu ,  Tsuneo Horiguchi ,  Yahei Koyamada

发明人： Haruyoshi Uchiyama ,  Tekken Lee ,  Nobunari Takeuchi ,  Kaoru Shimizu ,  Tsuneo Horiguchi ,  Yahei Koyamada

IPC分类号： G02F2/02 ,  H01S3/067 ,  H01S3/10

CPC分类号： H04B10/2572 ,  H01S3/06754

摘要： The present invention provides light frequency control apparatus comprising a light pulse signal generating mechanism for converting continuous light into a light pulse signal, and outputting this light pulse signal; a light signal generating mechanism for repeatedly generating at predetermined cycles, a light signal, in which a light frequency component therein is shifted to form a staircase shape based on the number of cycles of a loop within which the light pulse signal circulates; and a dummy light generating mechanism for generating dummy light at a timing such that the level of the light signal becomes zero, and supplying this dummy light to the light amplifying mechanism. The aforementioned loop is formed from a light amplifying mechanism for amplifying the light pulse signal outputted from the light pulse signal generating mechanism, light delay mechanism for delaying the light pulse signal a fixed amount; and frequency shifting mechanism for shifting the frequency of the light pulse signal.

摘要翻译： 本发明提供一种光频控制装置，包括：光脉冲信号发生机构，用于将连续光转换为光脉冲信号，并输出该光脉冲信号; 光信号发生机构，用于以预定周期反复产生基于光脉冲信号在其中循环的循环的循环次数而将其中的光频分量偏移以形成阶梯形状的光信号; 以及用于在使得光信号的电平变为零的定时产生虚拟光并将虚拟光提供给光放大机构的虚拟光产生机构。 上述环路由用于放大从光脉冲信号发生机构输出的光脉冲信号的光放大机构形成，用于将光脉冲信号延迟固定量的光延迟机构; 以及用于移动光脉冲信号的频率的频移机构。

公开(公告)号：US20090148112A1

公开(公告)日：2009-06-11

申请号：US12196429

申请日：2008-08-22

申请人： Yahei KOYAMADA ,  Katsunori Imamura

发明人： Yahei KOYAMADA ,  Katsunori Imamura

IPC分类号： G02B6/036

CPC分类号： G02B6/03638 ,  G02B6/02019 ,  G02B6/02266

摘要： A silica-based optical fiber includes a core and a cladding that is formed on an outer circumference of the core. The core includes three or more layers including a layer doped with at least one of germanium and fluorine, and a concentration of the germanium or the fluorine in each of the layers is controlled in such a manner that a Brillouin gain spectral peak is spread into a plurality of peaks on a Brillouin gain spectrum. With this scheme, an optical fiber is provided, which has stable characteristics in the longitudinal direction, and which has a high SBS threshold so that generation of the SBS can be effectively suppressed.

摘要翻译： 二氧化硅基光纤包括形成在芯的外圆周上的芯和包层。 芯包括三层或更多层，包括掺杂有锗和氟中的至少一种的层，并且以这样的方式控制每层中的锗或氟的浓度，使得布里渊增益光谱峰扩散到 布里渊增益谱上的多个峰。 通过该方案，提供了在纵向上具有稳定特性并且具有高SBS阈值的光纤，从而可以有效地抑制SBS的产生。

公开(公告)号：US06606441B2

公开(公告)日：2003-08-12

申请号：US09891258

申请日：2001-06-27

申请人： Kikue Irie ,  Toshinori Sumi ,  Tomonari Yoshimura ,  Yoshihiro Uozu ,  Yahei Koyamada ,  Shiori Miyake

发明人： Kikue Irie ,  Toshinori Sumi ,  Tomonari Yoshimura ,  Yoshihiro Uozu ,  Yahei Koyamada ,  Shiori Miyake

IPC分类号： G02B602

CPC分类号： G02B6/03622 ,  G02B6/02033

摘要： A plastic optical fiber includes having a first core, a second core having a different refractive index from the first core, disposed concentrically on the outside of the first core, and a clad disposed concentrically on the outside of the second core, wherein a ratio X (r1/r2) of a first core radius r1 to a second core radius r2 and a ratio Y (n2/n1) of a refractive index difference n2 between the second core and the clad to a refactive index difference n1 between the first core and the clad are in a range that satisfies the expressions Y≧−1.134X+1.0518 (1), and X≦−1.4842Y2+1.1097Y+0.7097 (2), and provided that Y

摘要翻译： 一种塑料光纤包括具有第一芯，第二芯与第一芯的折射率不同的第二芯，同心地设置在第一芯的外侧，以及同心地设置在第二芯的外侧上的包层，其中X 第一纤芯半径r1至第二纤芯半径r2的第（r1 / r2）和第二纤芯与包层之间的折射率差n2与第一纤芯和包层之间的折射率差n1的比率Y（n2 / n1） 包层在满足表达式Y> = - 1.134X + 1.0518（1）和X <= - 1.4842Y2 + 1.1097Y + 0.7097（2）的范围内，并且条件是Y <0.4或X> = 0.76和 不排除X = 0.8和Y = 0.35以及X = 0.8和Y = 0.45的坐标对。 塑料光纤可以具有高传输功率和宽带宽。 电缆和光学传输装置可以各自包括该塑料光纤。

公开(公告)号：US4126837A

公开(公告)日：1978-11-21

申请号：US723502

申请日：1976-09-15

申请人： Yahei Koyamada ,  Fujio Ishihara

发明人： Yahei Koyamada ,  Fujio Ishihara

IPC分类号： H03H9/00 ,  H03H9/25 ,  H03H9/64 ,  H03H9/04 ,  H03H9/20 ,  H03H9/26 ,  H03H13/00

CPC分类号： H03H9/6433 ,  H03H9/0028 ,  H03H9/25 ,  H03H9/6409

摘要： An impedance element is disclosed which is formed with an electro-elastic surface wave transducing device composed of a substrate for the propagation of an elastic surface wave and an electro-elastic surface wave transducer disposed on the substrate for converting an electrical signal into an elastic surface wave or vice versa. The impedance element has a frequency-impedance characteristic that it exhibits a sufficiently high impedance in a predetermined frequency band but a sufficiently low impedance in the other frequency bands.Further, a band-rejection filter is disclosed which includes the abovesaid impedance element and has a band-rejection filter characteristic dependent upon the frequency-impedance characteristic of the impedance element.

摘要翻译： 公开了一种阻抗元件，其形成有由用于传播弹性表面波的基板和设置在基板上的电子弹性表面波换能器构成的电 - 弹性表面波换能装置，用于将电信号转换成弹性表面 波，反之亦然。 阻抗元件具有频率阻抗特性，其在预定频带中呈现足够高的阻抗，但在其它频带中具有足够低的阻抗。