公开(公告)号：US20100272445A1

公开(公告)日：2010-10-28

申请号：US12822797

申请日：2010-06-24

申请人： Shinya INAGAKI ,  Norifumi Shukunami ,  Susumu Kinoshita ,  Hiroyuki Itou ,  Taiki Kobayashi

发明人： Shinya INAGAKI ,  Norifumi Shukunami ,  Susumu Kinoshita ,  Hiroyuki Itou ,  Taiki Kobayashi

IPC分类号： H04B10/00

CPC分类号： H04B10/2942 ,  H01S3/06758 ,  H01S3/1301 ,  H01S3/1305 ,  H04B10/2912 ,  H04B10/2941 ,  H04B2210/003

摘要： An optical amplification device which includes first and second optical amplifiers, and a controller. The first optical amplifier receives a light and amplifies the received light. The second optical amplifier receives the light amplified by the first optical amplifier, and amplifies the received light. When a level of the light received by the first optical amplifier changes by Δ, the controller controls a level of the light received by the second optical amplifier to change by approximately −Δ. In various embodiments, the controller causes the sum of the gains of the first and second optical amplifiers to be constant. In other embodiments, the optical amplification device includes first and second optical amplifier and a gain adjustor. The gain adjustor detects a deviation in gain of the first optical amplifier from a target gain, and adjusts the gain of the second optical amplifier to compensate for the detected deviation.

摘要翻译： 一种包括第一和第二光放大器的光放大装置和控制器。 第一光放大器接收光并放大所接收的光。 第二光放大器接收由第一光放大器放大的光，并放大所接收的光。 当由第一光学放大器接收的光的电平改变＆Dgr时，控制器控制由第二光放大器接收的光的水平变化大约为＆Dgr。 在各种实施例中，控制器使得第一和第二光学放大器的增益之和恒定。 在其他实施例中，光放大装置包括第一和第二光放大器和增益调节器。 增益调节器检测第一光放大器的增益偏离目标增益，并调整第二光放大器的增益以补偿检测到的偏差。

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：US20060291036A1

公开(公告)日：2006-12-28

申请号：US11348334

申请日：2006-02-07

申请人： Norifumi Shukunami ,  Shinya Inagaki

发明人： Norifumi Shukunami ,  Shinya Inagaki

IPC分类号： H01S3/00 ,  G02B6/036 ,  G02B6/02

CPC分类号： H01S3/06754 ,  H01S3/0064 ,  H01S3/06725 ,  H01S3/06729 ,  H01S3/06758 ,  H01S3/094011 ,  H01S3/09415 ,  H01S2301/04 ,  H04B10/291 ,  H04B2210/003 ,  H04B2210/256

摘要： An optical amplifier that improves the quality of WDM transmission by reducing four-wave mixing. An optical fiber has positive chromatic dispersion in a signal band and is used as an optical amplification medium for amplifying a wavelength division multiplex signal. An excitation section inputs excitation light to the optical fiber. In order to actualize mismatching of phases of optical signals with different wavelengths to be propagated, the optical fiber has positive chromatic dispersion in a signal band by which there is a great difference between a signal frequency, being a frequency of a signal to be amplified, and a zero-dispersion frequency, being a frequency at which chromatic dispersion is zero. As a result, the optical fiber functions as an optical amplification medium in which four-wave mixing is suppressed.

摘要翻译： 一种通过减少四波混频来提高WDM传输质量的光放大器。 光纤在信号频带中具有正色散，并且用作用于放大波分复用信号的光放大介质。 激励部分向光纤输入激发光。 为了实现要传播的具有不同波长的光信号的相位的不匹配，光纤在信号频带中具有正色散，在信号频带中，作为要放大的信号的频率的信号频率之间存在很大的差异， 和零色散频率，其为色散为零的频率。 结果，光纤用作抑制四波混频的光放大介质。

公开(公告)号：US07061666B2

公开(公告)日：2006-06-13

申请号：US10414237

申请日：2003-04-16

申请人： Shinya Inagaki ,  Norifumi Shukunami ,  Susumu Kinoshita ,  Hiroyuki Itou ,  Taiki Kobayashi

发明人： Shinya Inagaki ,  Norifumi Shukunami ,  Susumu Kinoshita ,  Hiroyuki Itou ,  Taiki Kobayashi

IPC分类号： H01S3/00

CPC分类号： H04B10/2942 ,  H01S3/06758 ,  H01S3/1301 ,  H01S3/1305 ,  H04B10/2912 ,  H04B10/2941 ,  H04B2210/003

摘要： An optical amplification device which includes first and second optical amplifiers, and a controller. The first optical amplifier receives a light and amplifies the received light. The second optical amplifier receives the light amplified by the first optical amplifier, and amplifies the received light. When a level of the light received by the first optical amplifier changes by Δ, the controller controls a level of the light received by the second optical amplifier to change by approximately −Δ. In various embodiments, the controller causes the sum of the gains of the first and second optical amplifiers to be constant. In other embodiments, the optical amplification device includes first and second optical amplifier and a gain adjustor. The gain adjustor detects a deviation in gain of the first optical amplifier from a target gain, and adjusts the gain of the second optical amplifier to compensate for the detected deviation.

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。

公开(公告)号：US20050105170A1

公开(公告)日：2005-05-19

申请号：US10824576

申请日：2004-04-15

申请人： Norifumi Shukunami ,  Tomoto Tanaka ,  Mayumi Naito

发明人： Norifumi Shukunami ,  Tomoto Tanaka ,  Mayumi Naito

IPC分类号： H01S3/10 ,  H01S3/067 ,  H01S3/094 ,  H01S3/13 ,  H01S3/131 ,  H04B10/07 ,  H04B10/29 ,  H04B10/294 ,  H01S3/00

CPC分类号： H01S3/06754 ,  H01S3/094003 ,  H01S3/10015 ,  H01S3/1301 ,  H01S3/1305 ,  H01S2301/02

摘要： An amount of ASE generated changes due to a temperature and a signal input power of an optical amplifying unit and causes a fluctuation of a gain of the optical amplifying unit. A photodiode on an input side and a photodiode on an output side detect input and output powers, and a temperature detecting unit detects a temperature of an optical amplifier. A control unit corrects the amount of ASE generated based on the detected input and output powers and the temperature according to AGC control. Driving of an excitation LD is controlled by a corrected result, and a gain of the optical amplifier is kept constant.

摘要翻译： ASE产生的量由于光放大单元的温度和信号输入功率而变化，并导致光放大单元的增益波动。 输入侧的光电二极管和输出侧的光电二极管检测输入和输出功率，温度检测单元检测光放大器的温度。 控制单元根据检测到的输入和输出功率以及根据AGC控制的温度校正生成的ASE量。 激励LD的驱动由校正结果控制，光放大器的增益保持恒定。

公开(公告)号：US06529314B1

公开(公告)日：2003-03-04

申请号：US09361970

申请日：1999-07-28

申请人： Norifumi Shukunami ,  Susumu Kinoshita ,  Toshio Hashi

发明人： Norifumi Shukunami ,  Susumu Kinoshita ,  Toshio Hashi

IPC分类号： G02F202

CPC分类号： H01S3/06754 ,  G02F1/3536

摘要： Method and apparatus using four wave mixing (FWM) for wavelength conversion. An optical waveguide doped with a rare earth element is pumped so that an input optical signal is amplified as the input optical signal travels through the optical waveguide. The optical waveguide is provided with at least one light which, together with the input optical signal, causes four wave mixing (FWM) to occur in the optical waveguide. The FWM causes a converted optical signal to be produced in the optical waveguide and having a wavelength different from the input optical signal. If the input optical signal is modulated by a transmission signal, then the converted optical signal will also be modulated by the transmission signal. The optical waveguide can be, for example, an erbium doped optical fiber operating as an erbium doped fiber amplifier (EDFA). Therefore, an EDFA can be used for both amplification and wavelength conversion.

摘要翻译： 使用四波混频（FWM）进行波长转换的方法和装置。 掺杂有稀土元素的光波导被泵浦，使得当输入光信号通过光波导时，输入光信号被放大。 光波导设置有至少一个光，其与输入光信号一起在光波导中发生四波混频（FWM）。 FWM导致在光波导中产生转换后的光信号并具有与输入光信号不同的波长。 如果输入光信号被发送信号调制，则转换的光信号也将被发送信号调制。 光波导可以是例如作为掺铒光纤放大器（EDFA）工作的掺铒光纤。 因此，EDFA可用于放大和波长转换。

公开(公告)号：US06310717B1

公开(公告)日：2001-10-30

申请号：US09313783

申请日：1999-05-17

申请人： Norihisa Naganuma ,  Norifumi Shukunami

发明人： Norihisa Naganuma ,  Norifumi Shukunami

IPC分类号： H01S300

CPC分类号： H01S3/094003 ,  H01S3/067 ,  H01S3/06716 ,  H01S3/06754

摘要： Disclosed herein is an optical amplifier reduced in gain deviation. The optical amplifier includes a nonsilica fiber doped with a rare earth, and a fiber holder in which the nonsilica fiber is inserted and fixed. The fiber holder is optically arranged so that signal light to be amplified propagates in the nonsilica fiber. The nonsilica fiber is pumped so that the nonsilica fiber provides a gain band including the wavelength of the signal light. Opposite ends of the fiber holder are hermetically sealed to thereby easily cut off the nonsilica fiber from the outside air, so that the nonsilica fiber is stabilized physically or chemically. A fluoride glass fiber is suitable for the nonsilica fiber to reduce the gain deviation in a 1.55 &mgr;m band.

摘要翻译： 本文公开了减小增益偏差的光放大器。 光放大器包括掺杂有稀土的非二极管光纤，以及其中插入和固定非二极纤维的光纤保持器。 光纤保持器被光学地布置，使得待放大的信号光在非二极纤维中传播。 泵浦非二极管光纤，使得非二极管光纤提供包括信号光的波长的增益带。 纤维架的相对端密封，从而容易地将非二氧化硅纤维与外部空气切断，使得非二氧化硅纤维物理或化学稳定。 氟化物玻璃纤维适用于非硅纤维，以减少1.55μm带中的增益偏差。

公开(公告)号：US6134046A

公开(公告)日：2000-10-17

申请号：US39622

申请日：1998-03-16

申请人： Norifumi Shukunami ,  Shinya Inagaki ,  Miki Takeda

发明人： Norifumi Shukunami ,  Shinya Inagaki ,  Miki Takeda

IPC分类号： G02B6/02 ,  G02B6/036 ,  H01S3/06 ,  H01S3/067 ,  H01S3/07 ,  H01S3/10 ,  H01S3/23 ,  H01S3/00

CPC分类号： H01S3/10023 ,  H01S2301/02 ,  H01S3/06716 ,  H01S3/06754

摘要： An optical amplifying fiber including a core doped with a rare earth element and having a first refractive index, a cladding surrounding the core and having a second refractive index smaller than the first refractive index, and a fiber grating formed in the core for transmitting signal light having a first wavelength and pump light having a second wavelength and removing amplified spontaneous emission. The fiber grating is preferably positioned upstream of a middle point of the entire length of the optical amplifying fiber in terms of a propagation direction of signal light.

摘要翻译： 一种光学放大光纤，包括掺杂有稀土元素并具有第一折射率的芯，围绕芯并且具有小于第一折射率的第二折射率的包层以及形成在芯中的用于传输信号光的光纤光栅 具有第一波长和具有第二波长的泵浦光并且去除放大的自发发射。 就信号光的传播方向而言，光纤光栅优选地位于光放大光纤的整个长度的中点的上游。