公开(公告)号：US06452720B1

公开(公告)日：2002-09-17

申请号：US08889875

申请日：1997-07-08

申请人： Norihisa Naganuma ,  Norifumi Shukunami

发明人： Norihisa Naganuma ,  Norifumi Shukunami

IPC分类号： H01S300

CPC分类号： H01S3/06754 ,  H01S3/0933 ,  H01S3/094011 ,  H01S3/094096

摘要： A light source apparatus suitable for use for evaluation of an optical device and for production of pump light for an optical amplifier. The apparatus includes a light emitting element having a gain band and a band reflection filter optically connected to the light emitting element. The light emitting element outputs a light beam having a spectrum which is determined by the gain band. The filter produces, from the light beam outputted from the light emitting element, a transmission beam and a reflection beam which returns to the light emitting element. The filter has a reflection band included in the gain band of the light emitting element and narrower than the gain band, and the transmission beam of the filter has a maximum power higher than the maximum power of the light beam to be outputted from the light emitting element. With the construction, pump light having a maximum power higher than the maximum power of the light to be outputted from the light emitting element can be obtained. Further, since the center wavelength of the light beam to be obtained is determined by the reflection band of the filter, even if the gain band or spectrum of the light emitting element has some dispersion, a light beam having a desired center wavelength can be obtained, and this allows evaluation of an optical device.

摘要翻译： 一种光源装置，适用于光学装置的评估和用于生产用于光放大器的泵浦光。 该装置包括具有增益带的光发射元件和与发光元件光学连接的带反射滤光器。 发光元件输出具有由增益带决定的光谱的光束。 滤光器从发光元件输出的光束产生透射光束和返回到发光元件的反射光束。 滤光器具有包括在发光元件的增益带中并且比增益带窄的反射带，并且滤光器的透射束具有比从发光的光束输出的光束的最大功率高的最大功率 元件。 通过这种结构，可以获得具有高于从发光元件输出的光的最大功率的最大功率的泵浦光。 此外，由于要获得的光束的中心波长由滤光器的反射带确定，所以即使发光元件的增益带或光谱具有某种色散，也可以获得具有期望的中心波长的光束 ，并且这允许评估光学装置。

公开(公告)号：US09166679B2

公开(公告)日：2015-10-20

申请号：US13425640

申请日：2012-03-21

申请人： Norifumi Shukunami

发明人： Norifumi Shukunami

IPC分类号： G01J1/32 ,  H04B10/032 ,  H04B10/079 ,  H04B10/293 ,  H04J14/02

CPC分类号： H04B10/032 ,  H04B10/0797 ,  H04B10/2937 ,  H04J14/0294 ,  H04J14/0295

摘要： An optical amplification apparatus includes an optical amplification medium configured to receive a first light signal from an end of the optical amplification medium and a second light signal from the other end of the optical amplification medium in opposite directions, the first and second light signals being branched from a light signal, an excitation light source configured to supply excitation light to the optical amplification medium through a multiplexer, a monitor configured to monitor the first and second light signals input to the optical amplification medium, respectively and to output monitoring signals respectively, and a controller configured to control the excitation light source in accordance with the monitoring signals.

摘要翻译： 一种光放大装置，包括：光放大介质，被配置为从光放大介质的一端接收第一光信号和来自光放大介质的另一端的相反方向的第二光信号，第一和第二光信号是分支的 通过光信号，被配置为通过多路复用器将激励光提供给光放大介质的激励光源，分别监视输入到光放大介质的第一和第二光信号并分别输出监视信号的监视器，以及 控制器，被配置为根据监视信号控制激励光源。

公开(公告)号：US09065570B2

公开(公告)日：2015-06-23

申请号：US13291783

申请日：2011-11-08

申请人： Norifumi Shukunami ,  Tatsuya Tsuzuki ,  Hiroki Ooi

发明人： Norifumi Shukunami ,  Tatsuya Tsuzuki ,  Hiroki Ooi

IPC分类号： H04B10/17 ,  H04B10/294 ,  H04B10/12

CPC分类号： H04B10/2941 ,  H04B10/2942

摘要： In an optical amplification apparatus an optical amplifier amplifies an optical signal at set gain. An equalizer changes loss of the amplified optical signal according to wavelengths. A processor controls the equalizer so as to make the equalizer have a loss-wavelength characteristic corresponding to a gain tilt of the optical amplifier which occurs according to the set gain.

摘要翻译： 在光放大装置中，光放大器以设定的增益放大光信号。 均衡器根据波长改变放大的光信号的损耗。 处理器控制均衡器，以使均衡器具有与根据设定增益发生的光放大器的增益倾斜相对应的损耗波长特性。

公开(公告)号：US08655170B2

公开(公告)日：2014-02-18

申请号：US12818613

申请日：2010-06-18

申请人： Norifumi Shukunami ,  Kentaro Nakamura ,  Noriaki Mizuguchi

发明人： Norifumi Shukunami ,  Kentaro Nakamura ,  Noriaki Mizuguchi

IPC分类号： H04B10/08 ,  H04B17/00

CPC分类号： H04B10/07953

摘要： An OSNR monitor device includes an optical receiver including a delay interferometer which inputs an optical signal in accordance with a given bandwidth and outputs two optical signals and causes the optical signals to interfere with each other and optical detectors which outputs currents in accordance with optical powers of the optical signals output from the interferometer, an optical power monitor configured to obtain the optical powers of the optical signals received by the optical detectors included in the optical receiver, and an OSNR calculator configured to calculate an optical signal-to-noise ratio in accordance with the optical powers obtained from the optical power monitor and the reception bandwidth.

摘要翻译： OSNR监视器装置包括：光接收机，包括延迟干涉仪，该延迟干涉仪根据给定的带宽输入光信号，并输出两个光信号，并使光信号相互干扰，并根据光功率输出电流的光检测器 从干涉仪输出的光信号，被配置为获得由光接收机中包括的光检测器接收的光信号的光功率的光功率监视器，以及被配置为根据光接收机计算光信噪比的OSNR计算器 具有从光功率监视器获得的光功率和接收带宽。

公开(公告)号：US08538264B2

公开(公告)日：2013-09-17

申请号：US12788773

申请日：2010-05-27

申请人： Masahiro Yuki ,  Tsukasa Takahashi ,  Miki Onaka ,  Norifumi Shukunami ,  Tatsuya Tsuzuki ,  Toshihiro Ohtani ,  Ryosuke Goto

发明人： Masahiro Yuki ,  Tsukasa Takahashi ,  Miki Onaka ,  Norifumi Shukunami ,  Tatsuya Tsuzuki ,  Toshihiro Ohtani ,  Ryosuke Goto

IPC分类号： H04B10/00 ,  H04B10/12 ,  H04J14/02

CPC分类号： H04B10/25133

摘要： A dispersion compensating apparatus includes a tunable dispersion compensator that dispersion-compensates an optical signal using a group delay property that is asymmetrical in bands outside an effective band; a set device that sets a dispersion compensation amount in the tunable dispersion compensator; and a shifter that shifts a central frequency of the effective band of the tunable dispersion compensator, based on the dispersion compensation amount set by the set device.

摘要翻译： 色散补偿装置包括可调色散补偿器，其使用在有效频带之外的频带中不对称的组延迟特性对光信号进行色散补偿; 设置可调色散补偿器中的色散补偿量的集合装置; 以及基于由所述设定装置设定的色散补偿量，使所述可调色散补偿器的有效频带的中心频率偏移的移位器。

公开(公告)号：US20110311222A1

公开(公告)日：2011-12-22

申请号：US13160294

申请日：2011-06-14

申请人： Kentaro Nakamura ,  Norifumi Shukunami

发明人： Kentaro Nakamura ,  Norifumi Shukunami

IPC分类号： H04B17/00

CPC分类号： H04B10/07953

摘要： An OSNR measuring device n OSNR measuring device includes an input port to which a signal light is given; a wavelength filter which includes a variable passband, and selectively takes out an optical component corresponding to a signal optical wavelength to be measured from the signal light; a wavelength control circuit which controls the passband of the wavelength filter; a delay interferometer which branches a light output from the wavelength filter and delays one of the branched lights with respect to the other branched light and in which the branched lights are made to interfere with each other; a photodetector which detects a power of a delay interference light output; and an OSNR calculation circuit which calculates, based on a bandwidth of a passband of the wavelength filter and the power of the delay interference light, an optical signal to noise ratio of a signal optical wavelength to be measured.

摘要翻译： OSNR测量装置n OSNR测量装置包括给予信号光的输入端口; 包括可变通带的波长滤波器，并且从所述信号光中选择性地取出与要测量的信号光波长对应的光学分量; 波长控制电路，其控制所述波长滤波器的通带; 延迟干涉仪，其分支来自所述波长滤波器的光输出，并且相对于所述另一分支光延迟所述分支光中的一个，并且使所述分支光彼此干涉; 光检测器，其检测延迟干涉光输出的功率; 以及OSNR计算电路，其基于波长滤波器的通带的带宽和延迟干扰光的功率，计算要测量的信号光波长的光信噪比。

公开(公告)号：US08068275B2

公开(公告)日：2011-11-29

申请号：US12656686

申请日：2010-02-12

申请人： Norifumi Shukunami ,  Tatsuya Tsuzuki

发明人： Norifumi Shukunami ,  Tatsuya Tsuzuki

IPC分类号： H01S3/30 ,  H04B10/12

CPC分类号： G01M11/33 ,  G01M11/319 ,  H04B10/255

摘要： In an optical amplifier, an input light is supplied to one end of an optical fiber connected to an output port, and the power of a light in an opposite direction which is input to the output port from the one end of the optical fiber, is measured, thereby obtaining a stimulated Brillouin scattering (SBS) occurrence threshold in the optical fiber based on the measurement result. Then, using the SBS occurrence threshold, a relation between the input light power and an occurrence amount of the self phase modulation (SPM) or the like in the optical fiber is obtained to be reflected on a control of the optical amplifier, so that an occurrence of the SPM or the like in the optical fiber is suppressed. As a result, it becomes possible to accurately measure, with a simple configuration, the nonlinear optical properties of the optical fiber actually connected to the output port of the optical amplifier, so that the optical S/N ratio degradation due to a nonlinear optical effect can be effectively suppressed.

摘要翻译： 在光放大器中，输入光被提供到连接到输出端口的光纤的一端，并且从光纤的一端输入到输出端口的相反方向的光的功率为 测量，从而基于测量结果在光纤中获得受激布里渊散射（SBS）出现阈值。 然后，使用SBS发生阈值，获得输入光功率与光纤中的自相位调制（SPM）等的发生量之间的关系，以反映在光放大器的控制上，使得 抑制光纤中的SPM等的发生。 结果，可以以简单的结构精确地测量实际连接到光放大器的输出端口的光纤的非线性光学特性，使得由于非线性光学效应导致的光S / N比劣化 可以有效地抑制。

公开(公告)号：US20080013162A1

公开(公告)日：2008-01-17

申请号：US11822841

申请日：2007-07-10

申请人： Norifumi Shukunami ,  Tatsuya Tsuzuki

发明人： Norifumi Shukunami ,  Tatsuya Tsuzuki

IPC分类号： H01S3/00

CPC分类号： G01M11/33 ,  G01M11/319 ,  H04B10/255

摘要： In an optical amplifier of the present invention, an input light is supplied to one end of an optical fiber connected to an output port, and the power of a light In an opposite direction which is input to the output port from the one end of the optical fiber, is measured, thereby obtaining a stimulated Brillouin scattering (SBS) occurrence threshold in the optical fiber based on the measurement result. Then, using the SBS occurrence threshold, a relation been the input light power and an occurrence amount of the self phase modulation (SPM) or the like in the optical fiber is obtained to be reflected on a control of the optical amplifier, so that an occurrence of the SPM or the like in the optical fiber is suppressed. As a result, It becomes possible to accurately measure, with a simple configuration, the nonlinear optical properties of the optical fiber actually connected to the output port of the optical amplifier, so that the optical S/N ratio degradation due to a nonlinear optical effect can be effectively suppressed.

摘要翻译： 在本发明的光放大器中，输入光被提供给连接到输出端口的光纤的一端，并且光的功率与从输出端口的一端输入到输出端口的相反方向 光纤，从而基于测量结果在光纤中获得受激布里渊散射（SBS）发生阈值。 然后，使用SBS发生阈值，获得输入光功率和光纤中的自相位调制（SPM）等的发生量的关系，以反映在光放大器的控制上，使得 抑制光纤中的SPM等的发生。 结果，能够以简单的结构精确地测量实际连接到光放大器的输出端口的光纤的非线性光学特性，使得由于非线性光学效应导致的光S / N比劣化 可以有效地抑制。

公开(公告)号：US20050270635A1

公开(公告)日：2005-12-08

申请号：US11185874

申请日：2005-07-21

申请人： Norifumi Shukunami ,  Norihisa Naganuma ,  Yuichi Suzuki ,  Takashi Ishiwada

发明人： Norifumi Shukunami ,  Norihisa Naganuma ,  Yuichi Suzuki ,  Takashi Ishiwada

IPC分类号： G02F1/01 ,  G02F1/09 ,  H01S3/00 ,  H01S3/067 ,  H01S3/094 ,  H01S3/0941 ,  H01S3/10 ,  H01S3/13 ,  H01S3/16

CPC分类号： H04B10/2931 ,  G02F1/0123 ,  G02F1/093 ,  H01S3/005 ,  H01S3/0064 ,  H01S3/06754 ,  H01S3/06758 ,  H01S3/094015 ,  H01S3/10015 ,  H01S3/10023 ,  H01S3/1305 ,  H01S3/1608 ,  H04B10/2941

摘要： An optical apparatus which is reduced in the number of optical devices arranged on a main optical signal transmission path, thereby reducing the size and cost of the device, and which is improved in optical transmission quality. An optical amplifier includes an amplification medium, which is doped with an active material for optical amplification and to which pump light is introduced, for amplifying an optical signal to be output. A reflection-type variable optical attenuator includes a reflecting mirror for reflecting an input light to generate a reflected light, and a magneto-optical crystal arranged in a position where the input and reflected lights pass. The magneto-optical crystal is applied with a magnetic field to induce a Faraday rotation angle therein and thereby vary an attenuation amount of the amplified optical signal, and part of light transmitted through the reflecting mirror is converted, as input monitor light, into an electrical signal.

摘要翻译： 减少了布置在主光信号传输路径上的光学装置的数量的光学装置，从而减小了装置的尺寸和成本，并提高了光传输质量。 光放大器包括一个放大介质，其被掺入用于光放大的有源材料并被引入泵浦光，用于放大要输出的光信号。 反射型可变光衰减器包括用于反射输入光以产生反射光的反射镜和布置在输入和反射光通过的位置的磁光晶体。 磁光晶体被施加有磁场以在其中诱发法拉第旋转角度，从而改变放大的光信号的衰减量，并且透射通过反射镜的光的一部分作为输入监视光转换成电 信号。

公开(公告)号：US06903324B2

公开(公告)日：2005-06-07

申请号：US10102690

申请日：2002-03-22

申请人： Hiroaki Tomofuji ,  Takuji Maeda ,  Norifumi Shukunami ,  Tatsuya Tsuzuki ,  Yuichi Suzuki

发明人： Hiroaki Tomofuji ,  Takuji Maeda ,  Norifumi Shukunami ,  Tatsuya Tsuzuki ,  Yuichi Suzuki

IPC分类号： H01S3/10 ,  H01S3/131 ,  H04B10/077 ,  H04B10/079 ,  H04B10/2507 ,  H04B10/29 ,  H04B10/296 ,  H04J14/00 ,  H04J14/02 ,  H01A3/00

CPC分类号： H04B10/2942

摘要： Wavelength multiplexed light is amplified by first and second EDFs. Gains of the first and the second EDFs are respectively held to be predetermined values by first and second AGC circuits. Between the first and the second EDFs, a variable attenuator is arranged. A loss in the variable attenuator is controlled by an ALC circuit so that output power is held to be a predetermined value instructed by a supervisory control signal. Respective time constants of the first and the second AGC circuits are sufficiently short in comparison with the response times of the first and the second EDFs. The time constant of the ALC circuit is sufficiently long in comparison with the time period required to transmit the supervisory control signal to each optical node.

摘要翻译： 波长复用光被第一和第二EDF放大。 通过第一和第二AGC电路将第一EDF和第二EDF的增益分别保持为预定值。 在第一和第二EDF之间设置可变衰减器。 可变衰减器的损耗由ALC电路控制，使得输出功率被保持为由监控信号指示的预定值。 与第一和第二EDF的响应时间相比，第一和第二AGC电路的相应时间常数足够短。 与向每个光节点发送监控信号所需的时间相比，ALC电路的时间常数足够长。