公开(公告)号：US06934433B2

公开(公告)日：2005-08-23

申请号：US10106315

申请日：2002-03-27

申请人： Hideyuki Miyata ,  Hiroshi Onaka ,  Tadao Nakazawa ,  Yutaka Kai ,  Hiroshi Miyata ,  Yoichi Takasu ,  Naoki Hashimoto

发明人： Hideyuki Miyata ,  Hiroshi Onaka ,  Tadao Nakazawa ,  Yutaka Kai ,  Hiroshi Miyata ,  Yoichi Takasu ,  Naoki Hashimoto

IPC分类号： G02B6/30 ,  G02B5/30 ,  G02B6/12 ,  G02B6/122 ,  G02F1/01 ,  G02F1/11 ,  G02F1/125 ,  G02F1/31 ,  H04J14/02 ,  G02B6/26

CPC分类号： H04J14/0221 ,  G02F1/0121 ,  G02F2203/585 ,  H04B10/0795 ,  H04B10/07953 ,  H04B10/0797

摘要： The present invention aims at providing a control method and a control apparatus for controlling the operation setting of an optical device with high accuracy, so as to reliably obtain characteristics according to a desired relationship to be set corresponding to a signal light, immediately after the control start. To this end, the control apparatus of the present invention comprises an optical coupler that branches a part of a main signal light input to the optical device, a monitoring optical device that operates in accordance with a control parameter same as for the optical device, and processes the monitor light branched by the optical coupler, a light receiver that receives the monitor light processed by the monitoring optical device, a detecting circuit that detects a relationship between the monitor light received by the light receiver, and the wavelength or optical power of the signal light, and a controlling circuit that adjust the control parameter for the optical device to control the operation setting, based on the relationship detected by the detecting circuit, so that characteristics of the optical device become capable of realizing the relationship to be set corresponding to the signal light.

摘要翻译： 本发明旨在提供一种用于高精度地控制光学装置的操作设置的控制方法和控制装置，以便在控制之后立即根据与信号光对应的期望关系可靠地获得特性 开始。 为此，本发明的控制装置包括将输入到光学装置的主信号光的一部分分支的光耦合器，根据与光学装置相同的控制参数进行操作的监视光学装置，以及 处理由光耦合器分支的监视光，接收由监视光学装置处理的监视光的光接收器，检测由光接收器接收的监视光之间的关系的检测电路以及光接收器的波长或光功率 信号灯，以及控制电路，其根据由检测电路检测到的关系调整光学装置的控制参数以控制操作设置，使得光学装置的特性变得能够实现与 信号灯。

公开(公告)号：US06654561B1

公开(公告)日：2003-11-25

申请号：US09699479

申请日：2000-10-31

申请人： Takafumi Terahara ,  Takeshi Sakamoto ,  Hiroaki Tomofuji ,  Motoyoshi Sekiya ,  Makoto Murakami ,  Kazuo Yamane ,  Hiroshi Onaka

发明人： Takafumi Terahara ,  Takeshi Sakamoto ,  Hiroaki Tomofuji ,  Motoyoshi Sekiya ,  Makoto Murakami ,  Kazuo Yamane ,  Hiroshi Onaka

IPC分类号： H04B1008

CPC分类号： H04B10/07953 ,  H04B10/0799

摘要： In a method of measuring an optical signal-to-noise ratio according to the present invention, a partial optical signal-to-noise ratio is defined, the partial optical signal-to-noise ratio is calculated from a predetermined physical quantity, the sum of inverse numbers of the partial optical signal-to-noise ratios is calculated, and further an inverse number of the sum is calculated to acquire an optical signal-to-noise ratio. The present invention makes it possible to measure optical SNR without directly measuring ASE in the optical signal. The present invention provides a measuring apparatus, a measuring circuit, a pre-emphasis method, an optical communication system, and a controlling apparatus each utilizing this method.

摘要翻译： 在根据本发明的测量光信噪比的方法中，定义部分光信噪比，从预定物理量计算部分光信噪比，总和 计算出部分光信噪比的逆数，并且进一步计算和的逆数以获得光信噪比。 本发明使得可以在光信号中不直接测量ASE来测量光信噪比。 本发明提供一种使用该方法的测量装置，测量电路，预加重方法，光通信系统和控制装置。

公开(公告)号：US06583900B2

公开(公告)日：2003-06-24

申请号：US10032094

申请日：2001-12-31

申请人： Hiroshi Onaka ,  Hideyuki Miyata ,  Kazue Otsuka ,  Yutaka Kai ,  Tadao Nakazawa ,  Terumi Chikama

发明人： Hiroshi Onaka ,  Hideyuki Miyata ,  Kazue Otsuka ,  Yutaka Kai ,  Tadao Nakazawa ,  Terumi Chikama

IPC分类号： H04B1020

CPC分类号： H04J14/0297 ,  H04J14/0204 ,  H04J14/0205 ,  H04J14/0206 ,  H04J14/0209 ,  H04J14/021 ,  H04J14/0212 ,  H04J14/0213 ,  H04J14/0219 ,  H04J14/0283 ,  H04J14/0289 ,  H04J14/0291 ,  H04J14/0294

摘要： In an OADM system, an OADM device includes an AOTF. The AOTF can select an optional wavelength by changing the frequency of an RF signal to be applied. An optical signal having a specified wavelength can be dropped from a wavelength-multiplexed optical signal input from an input terminal, or a wavelength-multiplexed optical signal input from an add port can be multiplexed with a through optical signal. However, considering the increase in coherent cross talk, the AOTF should be exclusively used for dropping in an actual device configuration. Otherwise, a drop optical signal is branched by an optical coupler with the wavelength selected by a tributary station. Thus, the wavelength selected by the tributary station can be extracted by the AOTF from the through optical signal.

公开(公告)号：US06538782B1

公开(公告)日：2003-03-25

申请号：US09076068

申请日：1998-05-12

申请人： Kazue Otsuka ,  Hiroshi Onaka ,  Terumi Chikama

发明人： Kazue Otsuka ,  Hiroshi Onaka ,  Terumi Chikama

IPC分类号： H04B1000

CPC分类号： H04J14/021 ,  H04J14/0205 ,  H04J14/0206 ,  H04J14/0209 ,  H04J14/0212 ,  H04J14/0221

摘要： A light branching/inserting apparatus which can easily control light signal wavelengths, and which can branch, insert or transmit light signals having an optional wavelength and optional multiplexed number, by using a wavelength selection filter utilizing acousto-optic effects. The apparatus comprises; an ADM node section 10 which has an AOTF 11 with four ports as a wavelength selection filter and is connected to a transmission path, an RF signal generator 20 which generates an RF signal of an optional frequency and applies the signal to the AOTF 11, a selected wavelength-variable light branching section 30 which receives and processes the light signal output from the branching port of the AOTF 11 for each wavelength, a light inserting section 40 which generates an optional number of insertion light signals with optional wavelengths and sends the insertion light signals to an insertion port of the AOTF 11, and a monitoring section 50 which monitors the spectrum of the light signal input/output to/from the ADM node section 10.

摘要翻译： 一种光分支/插入装置，其可以容易地控制光信号波长，并且可以通过使用利用声光效应的波长选择滤波器来分支，插入或发送具有可选波长和可选复用数的光信号。 该装置包括： 具有AOTF 11的ADM节点部分10，其具有四个端口作为波长选择滤波器并连接到传输路径; RF信号发生器20，其生成任选频率的RF信号并将该信号施加到AOTF 11; 选择的波长可变光分支部分30，其接收和处理从每个波长的AOTF 11的分支端口输出的光信号;光插入部分40，其产生任选数量的具有任选波长的插入光信号，并发送插入光 信号到AOTF11的插入端口，以及监视部分50，其监视从/从ADM节点部分10输入/输出的光信号的频谱。

公开(公告)号：US06351323B1

公开(公告)日：2002-02-26

申请号：US09080399

申请日：1998-05-18

申请人： Hiroshi Onaka ,  Hideyuki Miyata ,  Kazue Otsuka ,  Yutaka Kai ,  Tadao Nakazawa ,  Terumi Chikama

发明人： Hiroshi Onaka ,  Hideyuki Miyata ,  Kazue Otsuka ,  Yutaka Kai ,  Tadao Nakazawa ,  Terumi Chikama

IPC分类号： H04B1004

CPC分类号： H04J14/0297 ,  H04J14/0204 ,  H04J14/0205 ,  H04J14/0206 ,  H04J14/0209 ,  H04J14/021 ,  H04J14/0212 ,  H04J14/0213 ,  H04J14/0219 ,  H04J14/0283 ,  H04J14/0289 ,  H04J14/0291 ,  H04J14/0294

摘要： In an OADM system, an OADM device includes an AOTF. The AOTF can select an optional wavelength by changing the frequency of an RF signal to be applied. An optical signal having a specified wavelength can be dropped from a wavelength-multiplexed optical signal input from an input terminal, or a wavelength-multiplexed optical signal input from an add port can be multiplexed with a through optical signal. However, considering the increase in coherent cross talk, the AOTF should be exclusively used for dropping in an actual device configuration. Otherwise, a drop optical signal is branched by an optical coupler with the wavelength selected by a tributary station. Thus, the wavelength selected by the tributary station can be extracted by the AOTF from the through optical signal.

摘要翻译： 在OADM系统中，OADM设备包括AOTF。 AOTF可以通过改变要施加的RF信号的频率来选择可选的波长。 具有指定波长的光信号可以从输入端输入的波分复用光信号中丢弃，或从加入口输入的波分复用光信号可以与通过光信号复用。 然而，考虑到相干串扰的增加，AOTF应该专门用于实际的设备配置。 否则，分支光信号由具有由分支站选择的波长的光耦合器分支。 因此，辅助站选择的波长可以由AOTF从通过光信号提取。

公开(公告)号：US06266180B1

公开(公告)日：2001-07-24

申请号：US09339188

申请日：1999-06-24

申请人： Shinya Inagaki ,  Keiko Takeda ,  Kaoru Moriya ,  Hiroshi Onaka

发明人： Shinya Inagaki ,  Keiko Takeda ,  Kaoru Moriya ,  Hiroshi Onaka

IPC分类号： H01S310

CPC分类号： H01S3/06754 ,  H01S3/06716 ,  H01S3/06745 ,  H01S3/06758 ,  H01S3/1603

摘要： An optical amplifier which suppresses the occurrence of a nonlinear optical phenomena, such as four-wave mixing. The optical amplifier includes an optical fiber doped with a rare earth element, and a light source providing excitation light to the fiber so that a wavelength division multiplexed (WDM) light is amplified as the WDM light travels through the fiber from a first point to a second point along the fiber. A third point exists along the fiber between the first and second points at which a power of the WDM light substantially reaches a level producing a nonlinear optical phenomenal. A first portion of the fiber is between the first point and the third point, and a second portion of the fiber is between the third point and the second point. The second portion suppresses the occurrence of the nonlinear optical phenomena as compared to the first portion. The second portion can have various different constructions to provide the required suppression effect.

摘要翻译： 抑制诸如四波混频的非线性光学现象的发生的光放大器。 光放大器包括掺杂有稀土元素的光纤和向光纤提供激发光的光源，使得当WDM光从第一点传播到第一点时，波分复用（WDM）光被放大 第二点沿着纤维。 在第一和第二点之间的光纤上存在第三点，在该点处，WDM光的功率基本上达到产生非线性光学现象的电平。 纤维的第一部分在第一点和第三点之间，纤维的第二部分在第三点和第二点之间。 与第一部分相比，第二部分抑制非线性光学现象的发生。 第二部分可以具有各种不同的结构以提供所需的抑制效果。

公开(公告)号：US6067187A

公开(公告)日：2000-05-23

申请号：US754843

申请日：1996-11-22

申请人： Hiroshi Onaka ,  Hideyuki Miyata ,  Kazue Otsuka

发明人： Hiroshi Onaka ,  Hideyuki Miyata ,  Kazue Otsuka

IPC分类号： H01S3/094 ,  H01S3/131 ,  H04B10/07 ,  H04B10/25 ,  H04B10/29 ,  H04B10/294 ,  H04J14/00 ,  H04J14/02 ,  H04B10/00 ,  G02B6/22 ,  H01S3/30

CPC分类号： H04B10/296 ,  H01S3/06754 ,  H01S3/10007 ,  H04B10/291 ,  H04B10/2912 ,  H04B10/2931 ,  H04B10/2942 ,  H04J14/0221 ,  H01S2301/04 ,  H01S3/094003 ,  H01S3/10015 ,  H01S3/1301

摘要： An optical amplifier has an optical amplifying medium, a pump light source outputting pump light, and a first optical coupler for supplying the pump light to the optical amplifying medium. A probe light source outputs probe light having a wavelength included in an amplification band, a second optical coupler supplies the probe light to the optical amplifying medium, and detectors detect the powers of input signal light and the probe light, respectively. A control unit controls the power of the probe light according to outputs from the detectors. This structure makes it possible to provide an optical amplifier which can reduce the wavelength dependence of gain.

摘要翻译： 光放大器具有光放大介质，输出泵浦光的泵浦光源和用于将泵浦光提供给光放大介质的第一光耦合器。 探测光源输出具有包括在放大频带中的波长的探测光，第二光耦合器将探测光提供给光放大介质，检测器分别检测输入信号光和探测光的功率。 控制单元根据检测器的输出来控制探测光的功率。 这种结构使得可以提供可以降低增益的波长依赖性的光放大器。

公开(公告)号：US6018411A

公开(公告)日：2000-01-25

申请号：US859256

申请日：1997-05-20

申请人： Nobuhiro Fukushima ,  Hiroshi Onaka

发明人： Nobuhiro Fukushima ,  Hiroshi Onaka

IPC分类号： G02B27/28 ,  G02F1/09

CPC分类号： G02F1/091 ,  G02F2203/48

摘要： The present invention provides an optical device making use of a magneto-optical effect. The optical device comprises: a reflector for reflecting an input beam as a reflected beam; a magneto-optical crystal provided so as to pass the input and reflected beams; a first unit for applying a magnetic field to the magneto-optical crystal; and a second unit for varying the magnetic field in accordance with a control signal. The configuration described above allows a small magneto-optical crystal to be used and, thus, a small-size and a low-cost Faraday rotator to be provided. By adding a polarizer to such a Faraday rotator, a variable optical attenuator can be obtained. In particular, by employing a wedge plate as the polarizer, a polarized-independent optical attenuator can be provided.

摘要翻译： 本发明提供一种利用磁光效应的光学装置。 光学装置包括：用于反射作为反射光束的输入光束的反射器; 设置为使输入和反射光束通过的磁光晶体; 用于向磁光晶体施加磁场的第一单元; 以及用于根据控制信号改变磁场的第二单元。 上述结构允许使用小的磁光晶体，并且因此提供小尺寸和低成本的法拉第旋转器。 通过向这种法拉第旋转器添加偏振器，可以获得可变光衰减器。 特别地，通过采用楔形板作为偏振器，可以提供偏振非依赖的光衰减器。

公开(公告)号：US5894362A

公开(公告)日：1999-04-13

申请号：US699563

申请日：1996-08-19

申请人： Hiroshi Onaka ,  Kazue Otsuka ,  Hideyuki Miyata

发明人： Hiroshi Onaka ,  Kazue Otsuka ,  Hideyuki Miyata

IPC分类号： G01J3/28 ,  G02F1/35 ,  H04B10/07 ,  H04B10/077 ,  H04B10/079 ,  H04B10/294 ,  H04J14/00 ,  H04J14/02

CPC分类号： H04J14/0221 ,  H04B10/077 ,  H04B10/0795 ,  H04B10/07953 ,  H04B10/07955 ,  H04B10/07957 ,  H04B10/0799 ,  H04B10/506 ,  H04B10/564 ,  H04B10/572 ,  H04J14/0297 ,  H04J14/0284

摘要： An optical communication system for transmitting wavelength division multiplexed (WDM) signal light through an optical fiber. The optical communication system includes a decoupling unit and a monitoring unit. The decoupling unit decouples a portion of the WDM signal light from the optical fiber as a monitoring signal. The monitoring unit determines the spectrum of the WDM signal light from the monitoring signal and performs control processing in accordance with the determined spectrum. Control processing includes performing at least one of the following: (1) controlling light sources to maintain a constant wavelength of each light signal in the WDM signal light, (b) determining a noise figure of an optical amplifier which amplifies the WDM signal light, (c) controlling the optical amplifier to achieve a desired noise figure, (d) detecting a signal-to-noise ratio of the WDM signal light, (e) detecting a true signal power of the WDM signal light, (f) maintaining the true signal power to be at a constant level, (g) counting the number of channels in the WDM signal light, (h) equalizing the gain of an optical amplifier to maintain a flat gain, (i) selecting a light source from among redundant light sources for providing a light signal on a respective channel of the WDM signal light, or (j) selecting a respective channel of the WDM signal light for signal enhancement.

摘要翻译： 一种用于通过光纤传输波分复用（WDM）信号光的光通信系统。 光通信系统包括去耦单元和监视单元。 解耦单元将来自光纤的WDM信号光的一部分作为监测信号去耦。 监视单元根据监视信号确定WDM信号光的频谱，并根据所确定的频谱执行控制处理。 控制处理包括执行以下中的至少一个：（1）控制光源以维持WDM信号光中每个光信号的恒定波长，（b）确定放大WDM信号光的光放大器的噪声系数， （c）控制光放大器以获得所需的噪声系数，（d）检测WDM信号光的信噪比，（e）检测WDM信号光的真实信号功率，（f） （g）对WDM信号光中的通道数进行计数，（h）使光放大器的增益均衡以保持平坦的增益，（i）从冗余中选择光源 用于在WDM信号光的相应通道上提供光信号的光源，或（j）选择用于信号增强的WDM信号光的相应通道。

公开(公告)号：US5867300A

公开(公告)日：1999-02-02

申请号：US804517

申请日：1997-02-21

申请人： Hiroshi Onaka ,  Nobuhiro Fukushima

发明人： Hiroshi Onaka ,  Nobuhiro Fukushima

IPC分类号： G02B26/02 ,  G01R33/02 ,  G02F1/09 ,  G02F1/35 ,  H04B10/079 ,  H04B10/516 ,  H04B10/61

CPC分类号： G02F1/09 ,  G02F1/093 ,  G02F2203/48

摘要： An apparatus which attenuates a light signal polarized in a first direction. The apparatus includes a polarization rotation unit and an output unit. The polarization rotation unit rotates the polarization of the light signal to produce a polarization rotated light signal having a polarization component in the first direction and a polarization component in a second direction which is substantially 90 degrees with respect to the first direction. The output unit passes, as an output signal, the polarization component in the second direction of the polarization rotated light signal and blocks the polarization component in the first direction. The polarization rotation unit includes an electromagnet and a permanent magnet which apply magnetic fields in specific directions with respect to the light path. Various yoke constructions are provided for the electromagnet and the permanent magnet. A control circuit maintains the output power of the output signal at a constant level, or maintains a constant ratio between the power level of the output signal and the power level of the light signal before the polarization is rotated. The apparatus can have a wavelength dependent attenuation which compensates for the wavelength dependent gain of an optical amplifier.

摘要翻译： 一种衰减在第一方向上偏振的光信号的装置。 该装置包括偏振旋转单元和输出单元。 偏振旋转单元旋转光信号的偏振，以产生具有第一方向的偏振分量和相对于第一方向基本上为90度的第二方向的偏振分量的偏振旋转光信号。 输出单元将偏振旋转光信号的第二方向上的偏振分量作为输出信号传递，并阻止第一方向的偏振分量。 偏振旋转单元包括在相对于光路在特定方向上施加磁场的电磁体和永磁体。 为电磁铁和永久磁铁提供各种轭结构。 控制电路将输出信号的输出功率维持在恒定水平，或者在偏振旋转之前保持输出信号的功率电平和光信号的功率电平之间的恒定比率。 该装置可以具有波长相关的衰减，其补偿光放大器的与波长相关的增益。