公开(公告)号：US06411429B1

公开(公告)日：2002-06-25

申请号：US09667433

申请日：2000-09-22

申请人： Hiroaki Tomofuji ,  Motoyoshi Sekiya ,  Takeshi Sakamoto ,  Makoto Murakami ,  Chihiro Ohshima ,  Yoshihito Onoda

发明人： Hiroaki Tomofuji ,  Motoyoshi Sekiya ,  Takeshi Sakamoto ,  Makoto Murakami ,  Chihiro Ohshima ,  Yoshihito Onoda

IPC分类号： H01S300

CPC分类号： H04B10/296 ,  H01S3/067 ,  H01S3/06758 ,  H04B10/2931 ,  H04B2210/258

摘要： An optical amplifying apparatus for widening the input dynamic range and lowering noises. The optical amplifying apparatus comprises a first optical amplifier, an optical attenuator, a second optical amplifier and a controller. The first optical amplifier changes the target value of output light when the variance amount of input light reaches a predetermined value. The controller changes the attenuation amount of attenuator in accordance with a difference between the target value and the changed target value of the output light level of the first optical amplifier, when the target value of the output light level of the first optical amplifier is changed.

摘要翻译： 一种用于扩大输入动态范围并降低噪声的光学放大装置。 光放大装置包括第一光放大器，光衰减器，第二光放大器和控制器。 当输入光的变化量达到预定值时，第一光学放大器改变输出光的目标值。 当第一光放大器的输出光电平的目标值改变时，控制器根据目标值与第一光放大器的输出光电平的改变的目标值之间的差异来改变衰减器的衰减量。

公开(公告)号：US06320694B1

公开(公告)日：2001-11-20

申请号：US09042790

申请日：1998-03-17

申请人： Chihiro Ohshima

发明人： Chihiro Ohshima

IPC分类号： H01S300

CPC分类号： H01S3/06704 ,  G02F1/093 ,  H01S3/06754 ,  H01S3/094003 ,  H01S3/09408 ,  H01S5/40

摘要： The output level of pumping light supplied from a pumping light source is varied using a variable attenuator, which is controlled by a variable attenuator driver circuit. By separating a portion containing the pumping light source from a portion containing an amplification medium, it becomes possible to prevent heat emitted by the pumping light source from adversely affecting the amplification medium. By arranging the portion containing the pumping light source such that a pumping light source or sources can be added when necessary, optical transmission system requirements of having more pumping light sources for system upgrade can be accommodated readily. By packaging portions containing amplification media, an optical amplifier can be made small.

公开(公告)号：US20060023298A1

公开(公告)日：2006-02-02

申请号：US11085082

申请日：2005-03-22

申请人： Chihiro Ohshima ,  Etsuko Hayashi

发明人： Chihiro Ohshima ,  Etsuko Hayashi

IPC分类号： H01S3/00

CPC分类号： H04B10/296 ,  H01S3/06754 ,  H01S3/2383 ,  H04B2210/256 ,  H04B2210/258

摘要： In an optical amplifier of the invention, a WDM signal light is separated into N components by a demultiplexer after which each component is amplified by N optical amplifier sections, and the output light level of each optical amplifier section is controlled to a constant level by respective control circuits and multiplexed in a multiplexer. At this time, in the demultiplexer, the bandwidth of the signal light output from each of the output ports is designed to have a different value, so that inter-wavelength deviation in the optical output level that occurs in each of the optical amplifier sections, falls within a preset range. Moreover, the constant output control of each control circuit is performed by individually adjusting the gain of each of the optical amplifier sections in relation to fluctuations in the power level without channel number changes of the WDM signal light input to the demultiplexer. As a result, deviation in the optical output level over the entire wavelength bandwidth of the WDM signal light for fluctuations in the input level of the WDM signal light, can be suppressed to a minimum, with a simple configuration.

摘要翻译： 在本发明的光放大器中，通过解复用器将WDM信号光分离为N个分量，之后每个分量由N个光放大器部分放大，并且每个光放大器部分的输出光电平被相应地控制为恒定电平 控制电路并复用在多路复用器中。 此时，在解复用器中，从各个输出端口输出的信号光的带宽被设计为具有不同的值，使得在每个光放大器部分中出现的光输出电平的波长间偏差， 落在预设范围内。 而且，各个控制电路的恒定输出控制是通过分别调整每个光放大器部分的增益而与功率电平的波动相分离地进行的，而无需输入到解复用器的WDM信号光的信道数量变化。 结果，能够以简单的结构将WDM信号光的输入电平的波动的WDM信号光的整个波长带宽的光输出电平的偏差抑制到最小。

公开(公告)号：US20090220242A1

公开(公告)日：2009-09-03

申请号：US12338123

申请日：2008-12-18

申请人： Hiroki OOI ,  Takafumi Terahara ,  Kentaro Nakamura ,  Chihiro Ohshima ,  Tsuyoshi Yamamoto

发明人： Hiroki OOI ,  Takafumi Terahara ,  Kentaro Nakamura ,  Chihiro Ohshima ,  Tsuyoshi Yamamoto

IPC分类号： H04J14/02

CPC分类号： H04J14/0213 ,  H04J14/0205 ,  H04J14/0206 ,  H04J14/0208 ,  H04J14/0212

摘要： An optical adding and dropping device includes a drop section including an input port and having a through port and a plurality of drop ports set as output ports, a first multiplexer adapted to multiplex light from the through port and light from a plurality of add ports, and a spectrum foot removing section provided on the input side of the first multiplexer and adapted to remove a foot of a spectrum of light to be inputted from the add ports to the first multiplexer. The optical adding and dropping device can be configured at a low cost while it has adding and dropping functions.

摘要翻译： 一种光分插装置，包括具有输入端口，具有通孔和设置为输出端口的多个分支端口的放置部分，第一多路复用器，用于复用来自通孔的光和来自多个附加端口的光， 以及频谱测量脚移除部分，设置在第一多路复用器的输入侧，并且适于将要从添加端口输入的光谱的一个脚部移除到第一多路复用器。 光放大装置可以以低成本配置，具有添加和删除功能。

公开(公告)号：US06373623B1

公开(公告)日：2002-04-16

申请号：US09677759

申请日：2000-10-03

申请人： Chihiro Ohshima ,  Susumu Kinoshita ,  Terumi Chikama

发明人： Chihiro Ohshima ,  Susumu Kinoshita ,  Terumi Chikama

IPC分类号： H01S300

CPC分类号： H01S3/06704 ,  G02F1/093 ,  H01S3/06754 ,  H01S3/094003 ,  H01S3/09408 ,  H01S5/40

摘要： The output level of pumping light supplied from a pumping light source is varied using a variable attenuator, which is controlled by a variable attenuator driver circuit. By separating a portion containing the pumping light source from a portion containing an amplification medium, it becomes possible to prevent heat emitted by the pumping light source from adversely affecting the amplification medium. By arranging the portion containing the pumping light source such that a pumping light source or sources can be added when necessary, optical transmission system requirements of having more pumping light sources for system upgrade can be accommodated readily. By packaging portions containing amplification media, an optical amplifier can be made small.

摘要翻译： 从泵浦光源提供的泵浦光的输出电平使用由可变衰减器驱动电路控制的可变衰减器来改变。 通过从包含放大介质的部分分离含有泵浦光源的部分，可以防止由泵浦光源发出的热量对放大介质产生不利影响。 通过布置包含泵浦光源的部分，使得在必要时可以添加泵浦光源或源，可容易地适应具有用于系统升级的更多泵浦光源的光传输系统要求。 通过封装包含放大介质的部分，可以使光放大器变小。

公开(公告)号：US06335823B2

公开(公告)日：2002-01-01

申请号：US09769532

申请日：2001-01-26

申请人： Chihiro Ohshima ,  Susumu Kinoshita ,  Terumi Chikama

发明人： Chihiro Ohshima ,  Susumu Kinoshita ,  Terumi Chikama

IPC分类号： H01S301

CPC分类号： H01S3/094003 ,  H01S3/06704 ,  H01S3/09408

摘要： The output level of pumping light supplied from a pumping light source is varied using a variable attenuator, which is controlled by a variable attenuator driver circuit. By separating a portion containing the pumping light source from a portion containing an amplification medium, it becomes possible to prevent heat emitted by the pumping light source from adversely affecting the amplification medium. By arranging the portion containing the pumping light source such that a pumping light source or sources can be added when necessary, optical transmission system requirements of having more pumping light sources for system upgrade can be accommodated readily. By packaging portions containing amplification media, an optical amplifier can be made small.

公开(公告)号：US08958695B2

公开(公告)日：2015-02-17

申请号：US12338123

申请日：2008-12-18

申请人： Hiroki Ooi ,  Takafumi Terahara ,  Kentaro Nakamura ,  Chihiro Ohshima ,  Tsuyoshi Yamamoto

发明人： Hiroki Ooi ,  Takafumi Terahara ,  Kentaro Nakamura ,  Chihiro Ohshima ,  Tsuyoshi Yamamoto

IPC分类号： H04J14/02

CPC分类号： H04J14/0213 ,  H04J14/0205 ,  H04J14/0206 ,  H04J14/0208 ,  H04J14/0212

摘要： An optical adding and dropping device includes a drop section including an input port and having a through port and a plurality of drop ports set as output ports, a first multiplexer adapted to multiplex light from the through port and light from a plurality of add ports, and a spectrum foot removing section provided on the input side of the first multiplexer and adapted to remove a foot of a spectrum of light to be inputted from the add ports to the first multiplexer. The optical adding and dropping device can be configured at a low cost while it has adding and dropping functions.

摘要翻译： 一种光分插装置，包括具有输入端口，具有通孔和设置为输出端口的多个分支端口的放置部分，第一多路复用器，用于复用来自通孔的光和来自多个附加端口的光， 以及频谱测量脚移除部分，设置在第一多路复用器的输入侧，并且适于将要从添加端口输入的光谱的一个脚部移除到第一多路复用器。 光放大装置可以以低成本配置，具有添加和删除功能。

公开(公告)号：US07119950B2

公开(公告)日：2006-10-10

申请号：US11085082

申请日：2005-03-22

申请人： Chihiro Ohshima ,  Etsuko Hayashi

发明人： Chihiro Ohshima ,  Etsuko Hayashi

IPC分类号： H01S3/00

CPC分类号： H04B10/296 ,  H01S3/06754 ,  H01S3/2383 ,  H04B2210/256 ,  H04B2210/258

摘要： In an optical amplifier of the invention, a WDM signal light is separated into N components by a demultiplexer after which each component is amplified by N optical amplifier sections, and the output light level of each optical amplifier section is controlled to a constant level by respective control circuits and multiplexed in a multiplexer. At this time, in the demultiplexer, the bandwidth of the signal light output from each of the output ports is designed to have a different value, so that inter-wavelength deviation in the optical output level that occurs in each of the optical amplifier sections, falls within a preset range. Moreover, the constant output control of each control circuit is performed by individually adjusting the gain of each of the optical amplifier sections in relation to fluctuations in the power level without channel number changes of the WDM signal light input to the demultiplexer. As a result, deviation in the optical output level over the entire wavelength bandwidth of the WDM signal light for fluctuations in the input level of the WDM signal light, can be suppressed to a minimum, with a simple configuration.

公开(公告)号：US06496300B2

公开(公告)日：2002-12-17

申请号：US09093410

申请日：1998-06-09

申请人： Susumu Kinoshita ,  Miki Onaka ,  Yasushi Sugaya ,  Chihiro Ohshima ,  Terumi Chikama ,  Hiroyuki Itou ,  Tadashi Okiyama ,  Taiki Kobayashi

发明人： Susumu Kinoshita ,  Miki Onaka ,  Yasushi Sugaya ,  Chihiro Ohshima ,  Terumi Chikama ,  Hiroyuki Itou ,  Tadashi Okiyama ,  Taiki Kobayashi

IPC分类号： H04B1017

CPC分类号： H04B10/2941 ,  H01S3/06758 ,  H04B2210/003 ,  H04J14/0221

摘要： An optical amplifier of a wavelength-division multiplexing transmission system that includes a pre-stage optical amplifying unit and a post stage optical amplifying unit. The pre-stage optical amplifying unit has a rare-earth element doped optical fiber and a pump light source for inputting a pump light to the rare-earth element doped optical fiber. The post-stage optical amplifying unit has a second rare-earth element doped optical fiber and a pump light source for inputting a pump light to the second rare-earth element doped optical fiber. The pre-stage optical amplifying unit and the post-stage optical amplifying unit are optically connected by a detachable optical coupling device. In addition, a gain equalizing unit, positioned on an output side of the optical fibers, compensates for wavelength-dependency of a gain characteristic of the optical fibers.

摘要翻译： 一种包括前级光放大单元和后级光放大单元的波分复用传输系统的光放大器。 前级光放大单元具有稀土元素掺杂光纤和用于将泵浦光输入到稀土元素掺杂光纤的泵浦光源。 后级光放大单元具有第二稀土元素掺杂光纤和用于将泵浦光输入到第二稀土元素掺杂光纤的泵浦光源。 前级光放大单元和后级光放大单元通过可拆卸光耦合装置光学连接。 此外，位于光纤的输出侧的增益均衡单元补偿光纤的增益特性的波长依赖性。

公开(公告)号：US06462861B2

公开(公告)日：2002-10-08

申请号：US09861634

申请日：2001-05-22

申请人： Chihiro Ohshima ,  Yasushi Sugaya

发明人： Chihiro Ohshima ,  Yasushi Sugaya

IPC分类号： H01S300

CPC分类号： H04B10/2935 ,  H01S3/06758 ,  H01S3/10015 ,  H01S3/1301 ,  H01S3/302 ,  H01S2301/02 ,  H04B10/2916 ,  H04B2210/003 ,  H04B2210/258

摘要： The present invention aims at providing an optical amplifying apparatus constituted by combining Raman amplifiers, in which deterioration of a signal/noise ratio of output light is prevented to thereby improve the transmission characteristic of signal light, and an optical communication system utilizing such an optical amplifying apparatus. To this end, the optical amplifying apparatus according to the present invention comprises: first optical amplifying means for supplying excitation light to a Raman amplifying medium to thereby Raman amplify signal light; second optical amplifying means for amplifying the signal light output from the first optical amplifying means; and controlling means for controlling an operating state of the first optical amplifying means or the second optical amplifying means, so that a signal/noise ratio of the signal light to be output from the second optical amplifying means is kept substantially constant. The controlling means obtains a signal/noise ratio concerning an output light from the second optical amplifying means, based on a noise light component due to Raman amplification calculated in accordance with Raman excitation light power and to signal information in a preceding stage optical amplifying apparatus, and a noise light component calculated in accordance with input light power into the second optical amplifying means and to the signal information in the preceding stage optical amplifying apparatus, to control, for example, output setting levels of the first and second optical amplifying means, so that the obtained signal/noise ratio is kept substantially constant irrespective of the number of channel wavelengths of the signal light.

摘要翻译： 本发明的目的在于提供一种通过组合拉曼放大器构成的光放大装置，其中防止输出光信号/噪声比的恶化，从而提高信号光的透射特性，以及利用这种光放大的光通信系统 仪器。 为此，根据本发明的光放大装置包括：第一光放大装置，用于向拉曼放大介质提供激发光，从而拉曼放大信号光; 第二光放大装置，用于放大从第一光放大装置输出的信号光; 以及用于控制第一光放大装置或第二光放大装置的工作状态的控制装置，使得从第二光放大装置输出的信号光的信噪比保持基本恒定。 控制装置基于由于根据拉曼激发光功率计算的拉曼放大的噪声光分量和前级放大装置中的信号信号，获得关于来自第二光放大装置的输出光的信噪比， 以及根据输入光功率计算到第二光放大装置中的噪声光分量和前级放大装置中的信号信息，以控制例如第一和第二光放大装置的输出设定电平，因此 获得的信号/噪声比保持基本上恒定，而与信号光的信道波长的数量无关。