公开(公告)号：US06658189B2

公开(公告)日：2003-12-02

申请号：US09828299

申请日：2001-04-05

申请人： Hiromi Ajima ,  Yusuke Takei ,  Yukiko Furukata ,  Michitaka Okuta

发明人： Hiromi Ajima ,  Yusuke Takei ,  Yukiko Furukata ,  Michitaka Okuta

IPC分类号： G02B602

CPC分类号： H01S3/06754 ,  G02B6/2835

摘要： A broadband ASE light source is provided which comprises an amplifying optical fiber doped with rare earth; a pumping light source and an output port both which are connected to one end of the amplifying optical fiber via a multiplexer; and a reflecting or circulating member which is connected to the other end of the amplifying optical fiber, whereby the amplifying optical fiber emits ASE light containing a first and second wavelength bands through the port. Particularly, a second pumping light source may be connected to the other end of the amplifying optical fiber via another multiplexer to widen the wavelength band to longer wavelength side. Further, using the amplifying Er-doped optical fiber with the pumping light sources having wavelength of a 980 nm band, the ASE light source can emit a flattened broadband of 1530 to 1610 nm, combining the two wavelength bands of 1530 to 1570 mn and 1570 to 1610 nm. The input power supplied for the amplifying fiber from the second pumping light source may be less than 20% of the input power supplied for the amplifying fiber from the first pumping light source.

摘要翻译： 提供宽带ASE光源，其包括掺杂有稀土的放大光纤; 泵浦光源和输出端口，两者都经由多路复用器连接到放大光纤的一端; 以及连接到放大光纤的另一端的反射或循环构件，由此放大光纤通过端口发射包含第一和第二波长带的ASE光。 特别地，第二泵浦光源可以经由另一多路复用器连接到放大光纤的另一端，以将波长带宽化到更长的波长侧。 此外，使用具有波长为980nm波段的泵浦光源的放大Er掺杂光纤，ASE光源可以发射1530至1610nm的平坦宽带，将1530至1570nm和1570nm的两个波长带组合 至1610nm。 从第二泵浦光源提供给放大光纤的输入功率可以小于为来自第一泵浦光源的放大光纤提供的输入功率的20％。

公开(公告)号：US06867910B2

公开(公告)日：2005-03-15

申请号：US10132081

申请日：2002-04-23

申请人： Yusuke Takei ,  Hiromi Ajima ,  Yukiko Furukata

发明人： Yusuke Takei ,  Hiromi Ajima ,  Yukiko Furukata

IPC分类号： H01S3/067 ,  H01S3/00

CPC分类号： H01S3/067 ,  H01S3/06795

摘要： Provided is a wideband ASE light source, which has a high output and a little ripples in a wide band and the output of which is stable. In a wideband ASE light source constructed of a pumping light source that generates a pumping light, an erbium-doped optical fiber that generates an ASE light by incident pumping light, a reflector that is arranged at one terminal portion of the erbium-doped optical fiber and reflects the ASE light radiated from the erbium-doped optical fiber, an optical multiplexer that is arranged between a terminal portion of the erbium-doped optical fiber and the pumping light and optically multiplexes and demultiplexes the pumping light with or from the ASE light and an optical isolator that is arranged between the third terminal portion of the optical multiplexer and an output terminal and removes a return light to the erbium-doped optical fiber, the optical multiplexer has a maximum value of isolation in a wavelength band of 1570 nm to 1600 nm.

摘要翻译： 提供了宽带ASE光源，其宽输出具有高输出和小波纹，其输出稳定。 在由产生泵浦光的泵浦光源构成的宽带ASE光源中，通过入射泵浦光产生ASE光的掺铒光纤，配置在掺铒光纤的一端部的反射器 并且反射从掺铒光纤辐射的ASE光，布置在掺铒光纤的端子部分和泵浦光之间的光学多路复用器，并且与ASE光进行光学多路复用和解复用激发光，并且 布置在光复用器的第三端子部分和输出端子之间的光隔离器，并且去除掺铒光纤的返回光，光复用器具有在1570nm至1600nm的波长带中的最大隔离度 nm。

公开(公告)号：US06406197B1

公开(公告)日：2002-06-18

申请号：US09579785

申请日：2000-05-26

申请人： Michitaka Okuda ,  Hiromi Ajima ,  Yusuke Takei ,  Hiroshi Fujimoto ,  Kazuyuki Miyake ,  Tatsuhiro Kawamura ,  Yasuhide Sudo

发明人： Michitaka Okuda ,  Hiromi Ajima ,  Yusuke Takei ,  Hiroshi Fujimoto ,  Kazuyuki Miyake ,  Tatsuhiro Kawamura ,  Yasuhide Sudo

IPC分类号： G02B6255

CPC分类号： G02B6/2835 ,  H01S3/06708 ,  H01S3/06754 ,  H01S3/06758 ,  H01S3/1601 ,  H01S3/1603

摘要： An optical fiber coupler for optical fiber amplifier use in the field of optical communications is provided. The optical fiber coupler comprises: a rare earth-doped fiber as an optical amplifying element; a quasi rare earth-doped fiber for entrance of input signal light; a fused-stretch fiber portion as a multiplexing element which connects a part of the rare earth-doped fiber and a parts the quasi rare earth-doped fiber, wherein the fused-stretch fiber portion formed by stretched a fused mixture of parts of the rare earth-doped fiber and the quasi rare earth-doped fiber; and a single mode fiber which is jointed at a fused joint portion to another shortened rare earth-doped fiber connected to the fused-stretch fiber portion on a side connected by the quasi rare earth-doped fiber. The quasi rare earth-doped fiber has substantially equal propagation constant to the rare earth-doped fiber without substantially containing rare earth elements. The optical fiber coupler is fabricated by the steps of jointing a single mode fiber with a rare earth-doped fiber by fusing abutted end faces of both fibers to form a combined fiber; and fusing parallel contact parts of a quasi rare earth-doped fiber and of the rare earth-doped fiber of the combined fiber and then elongating the fused parts in a desired diameter to form a fused-stretch fiber portion.

摘要翻译： 提供了一种用于光通信领域的光纤放大器的光纤耦合器。 光纤耦合器包括：作为光放大元件的稀土掺杂光纤; 用于输入信号光入射的准稀土掺杂光纤; 熔融拉伸纤维部分作为将稀土掺杂纤维的一部分与准稀土掺杂纤维部分连接的多路复用元件，其中通过将稀有部分的熔融混合物拉伸而形成的熔融拉伸纤维部分 掺杂稀土的光纤和准稀土掺杂光纤; 以及在熔融接合部分处连接到另一个缩短的稀土掺杂光纤的单模光纤，该稀土掺杂光纤在与稀土掺杂光纤连接的一侧连接到熔融拉伸纤维部分。 准稀土掺杂光纤具有与稀土掺杂光纤基本相等的传播常数，而基本上不含稀土元素。 通过以下步骤制造光纤耦合器：通过将两个光纤的接合端面融合以形成组合光纤，将单模光纤与稀土掺杂光纤接合; 将准稀土掺杂纤维和混合纤维的稀土掺杂纤维的平行接触部分熔合，然后将熔融部分延伸到所需直径以形成熔融拉伸纤维部分。

公开(公告)号：US20070053626A1

公开(公告)日：2007-03-08

申请号：US10572251

申请日：2004-09-16

申请人： Yusuke Takei ,  Hiromi Ajima ,  Michitaka Okuta

发明人： Yusuke Takei ,  Hiromi Ajima ,  Michitaka Okuta

IPC分类号： G02B6/34

CPC分类号： G01B11/165 ,  G01B11/18

摘要： To provide a low-cost FBG sensing device having a high reliability, suitable for high-speed measurement such as vibration measurement, able to perform a remote measurement, and simple data processing, the FBG sensing device comprising one or more light sources each outputting a light having fixed output wavelength, one or more fiber-Bragg gratings each having a reflection wavelength band having an attenuation band where the magnitude of reflection attenuates with distance from the center wavelength, the fiber-Bragg gratings reflecting the lights output from said light sources, light receiving units corresponding said fiber-Bragg gratings respectively and receiving the light reflected by the corresponding fiber-Bragg grating, wherein intensities of reflected lights each of which changes corresponding to the attenuation band that changes due to a distortion produced at each of the fiber-Bragg gratings are detected to detect the distortions.

摘要翻译： 为了提供具有高可靠性的低成本FBG感测装置，适用于诸如振动测量的高速测量，能够进行远程测量和简单的数据处理，FBG感测装置包括一个或多个光源，每个光源输出 具有固定输出波长的光，一个或多个光纤布拉格光栅，每个光纤布拉格光栅具有反射波长带，其具有衰减带，其中反射幅度随距离中心波长的距离衰减，反射从所述光源输出的光的光纤布拉格光栅， 光接收单元分别对应所述光纤布拉格光栅并接收由对应的光纤布拉格光栅反射的光，其中每个反射光的强度对应于由于在每个光纤布拉格光栅处产生的失真而改变的衰减带改变， 检测布拉格光栅以检测失真。

公开(公告)号：US07366366B2

公开(公告)日：2008-04-29

申请号：US10572251

申请日：2004-09-16

申请人： Yusuke Takei ,  Hiromi Ajima ,  Michitaka Okuta

发明人： Yusuke Takei ,  Hiromi Ajima ,  Michitaka Okuta

IPC分类号： G02B6/00

CPC分类号： G01B11/165 ,  G01B11/18

摘要： To provide a low-cost FBG sensing device having a high reliability, suitable for high-speed measurement such as vibration measurement, able to perform a remote measurement, and simple data processing, the FBG sensing device comprising one or more light sources each outputting a light having fixed output wavelength, one or more fiber-Bragg gratings each having a reflection wavelength band having an attenuation band where the magnitude of reflection attenuates with distance from the center wavelength, the fiber-Bragg gratings reflecting the lights output from said light sources, light receiving units corresponding said fiber-Bragg gratings respectively and receiving the light reflected by the corresponding fiber-Bragg grating, wherein intensities of reflected lights each of which changes corresponding to the attenuation band that changes due to a distortion produced at each of the fiber-Bragg gratings are detected to detect the distortions.

摘要翻译： 为了提供具有高可靠性的低成本FBG感测装置，适用于诸如振动测量的高速测量，能够进行远程测量和简单的数据处理，FBG感测装置包括一个或多个光源，每个光源输出 具有固定输出波长的光，一个或多个光纤布拉格光栅，每个光纤布拉格光栅具有反射波长带，其具有衰减带，其中反射幅度随距离中心波长的距离衰减，反射从所述光源输出的光的光纤布拉格光栅， 光接收单元分别对应所述光纤布拉格光栅并接收由对应的光纤布拉格光栅反射的光，其中每个反射光的强度对应于由于在每个光纤布拉格光栅处产生的失真而改变的衰减带改变， 检测布拉格光栅以检测失真。

公开(公告)号：US20080262316A1

公开(公告)日：2008-10-23

申请号：US11572794

申请日：2005-07-28

申请人： Hiromi Ajima ,  Kousuke Katabe

发明人： Hiromi Ajima ,  Kousuke Katabe

IPC分类号： G02F1/361 ,  F21V9/16 ,  A61B1/07

CPC分类号： A61B1/0669 ,  A61B1/0646 ,  A61B1/0653 ,  A61B1/0684

摘要： A light source apparatus of the present invention comprises a semiconductor light emitting device which emits light, a wavelength converting member which receives the light emitted by the semiconductor light emitting device and emits light of a wavelength longer than that of the original light, and a wavelength selecting member which is disposed between the semiconductor light emitting device and the wavelength converting member and reflects and transmits the incident light with different reflectivity and different transmittance depending on the wavelength of the incident light.

摘要翻译： 本发明的光源装置包括发射光的半导体发光装置，接收由半导体发光装置发射的光并发射长于原始光的波长的波长的波长转换部件，以及波长 选择构件，其设置在半导体发光器件和波长转换构件之间，并且根据入射光的波长反射和透射具有不同反射率和不同透射率的入射光。

公开(公告)号：US06208457B1

公开(公告)日：2001-03-27

申请号：US09220874

申请日：1998-12-23

申请人： Michitaka Okuta ,  Hiromi Ajima

发明人： Michitaka Okuta ,  Hiromi Ajima

IPC分类号： H01S300

CPC分类号： G02B6/2835 ,  H01S3/094003

摘要： In an optical amplifier wherein pumping laser light and signal laser light are multiplexed and supplied as input to a fiber doped with a rare earth element, by decreasing the number of connected sections, loss due to the connection to the rare earth-doped fiber is decreased, thereby to improve the amplifying characteristics and to simplify the production step. a pair of fibers, each which is connected by a transmitting optical fiber 1 and a rare earth-doped fiber 4, at a connected sections, are heated and fused with each other are aligned in part length to a fused jointed portion 3 which is stretched in the vicinity of the connected section 2 on the rare earth-doped fiber side, thereby forming an optical coupler.

摘要翻译： 在将激光和信号激光的激光多路复用并作为输入提供给掺杂有稀土元素的光纤的光放大器中，通过减少连接部分的数量，由于与稀土掺杂光纤的连接而引起的损耗减少 从而提高放大特性并简化生产步骤。 在连接部分通过发射光纤1和稀土掺杂光纤4连接的一对光纤被加热并彼此熔合，部分长度对准被拉伸的熔接部3 在稀土掺杂光纤侧的连接部2附近，形成光耦合器。

公开(公告)号：US09281782B2

公开(公告)日：2016-03-08

申请号：US14123484

申请日：2012-05-31

申请人： Hiromi Ajima

发明人： Hiromi Ajima

IPC分类号： H03G3/20 ,  H03F1/02 ,  H03F3/189 ,  H03F3/24 ,  H04B1/04

CPC分类号： H03F1/02 ,  H03F1/025 ,  H03F3/189 ,  H03F3/24 ,  H03F3/245 ,  H03F2200/102 ,  H03F2200/336 ,  H03F2200/555 ,  H04B1/0475

摘要： The switching frequency in an envelope amplifier is set below that of a transmission RF signal. A transmitter according to the present invention includes a transmission amplifier (3) that amplifies an input signal and generates an output signal, a voltage control amplifier (6) that controls a power supply voltage of the transmission amplifier (3), and an envelope calculation unit (4) that calculates an approximate envelope signal that is an envelope signal of the input signal and is sampled at a lower frequency than the input signal. The voltage control amplifier (6) controls the power supply voltage of the transmission amplifier (3) based on the approximate envelope signal.

摘要翻译： 封装放大器中的开关频率被设置为低于发送RF信号的开关频率。 根据本发明的发射机包括放大输入信号并产生输出信号的发射放大器（3），控制发射放大器（3）的电源电压的电压控制放大器（6）和包络计算 单元（4），其计算作为输入信号的包络信号的近似包络信号，并以比输入信号低的频率进行采样。 电压控制放大器（6）基于近似包络信号来控制发送放大器（3）的电源电压。

公开(公告)号：US20140097893A1

公开(公告)日：2014-04-10

申请号：US14123484

申请日：2012-05-31

申请人： Hiromi Ajima

发明人： Hiromi Ajima

IPC分类号： H03F1/02

CPC分类号： H03F1/02 ,  H03F1/025 ,  H03F3/189 ,  H03F3/24 ,  H03F3/245 ,  H03F2200/102 ,  H03F2200/336 ,  H03F2200/555 ,  H04B1/0475

摘要： The switching frequency in an envelope amplifier is set below that of a transmission RF signal. A transmitter according to the present invention includes a transmission amplifier (3) that amplifies an input signal and generates an output signal, a voltage control amplifier (6) that controls a power supply voltage of the transmission amplifier (3), and an envelope calculation unit (4) that calculates an approximate envelope signal that is an envelope signal of the input signal and is sampled at a lower frequency than the input signal. The voltage control amplifier (6) controls the power supply voltage of the transmission amplifier (3) based on the approximate envelope signal.

摘要翻译： 封装放大器中的开关频率被设置为低于发送RF信号的开关频率。 根据本发明的发射机包括放大输入信号并产生输出信号的发射放大器（3），控制发射放大器（3）的电源电压的电压控制放大器（6）和包络计算 单元（4），其计算作为输入信号的包络信号的近似包络信号，并以比输入信号低的频率进行采样。 电压控制放大器（6）基于近似包络信号来控制发送放大器（3）的电源电压。