公开(公告)号：US06807376B2

公开(公告)日：2004-10-19

申请号：US09960403

申请日：2001-09-24

申请人： Naomasa Shimojoh ,  Takafumi Terahara ,  Terumi Chikama

发明人： Naomasa Shimojoh ,  Takafumi Terahara ,  Terumi Chikama

IPC分类号： H04B1012

CPC分类号： H04B10/2941 ,  H01S3/10023 ,  H01S3/1312 ,  H01S2301/04 ,  H04B10/2942 ,  H04J14/0221

摘要： A gain equalizer which equalizes gain versus wavelength characteristics of an optical amplifier. The gain versus wavelength characteristics of the optical amplifier include first, second and third gain peaks in a wavelength band with the second gain peak being between the first and third gain peaks. The optical amplifier amplifies an input signal in accordance with the gain versus wavelength characteristics to produce an output signal. The gain equalizer includes first, second and third optical filters having first, second and third transparency characteristics, respectively. The first, second and third transparency characteristics are periodic waveforms having different periods related to the wavelength difference between the first and third gain peaks. The second transparency characteristic is a periodic waveform having a period equal to 1/(2n) of the period of the waveform of the first transparency characteristic. The third transparency characteristic is a periodic waveform having a period equal to ¼ of the period of the waveform of the first transparency characteristic. For example, the first transparency characteristic is a periodic waveform with ¼ period extending between the first and third gain peaks, the second transparency characteristic is a periodic waveform with one period extending between the first and third gain peaks, and the third transparency characteristic is a periodic waveform with two periods extending between the first and third gain peaks.

摘要翻译： 增益均衡器，其均衡光放大器的增益对波长特性。 光放大器的增益对波长特性包括波长带中的第一，第二和第三增益峰值，第二增益峰值在第一和第三增益峰值之间。 光放大器根据增益对波长特性来放大输入信号以产生输出信号。 增益均衡器包括分别具有第一，第二和第三透明特性的第一，第二和第三滤光器。 第一，第二和第三透明度特征是具有与第一和第三增益峰值之间的波长差有关的不同周期的周期性波形。 第二透明度特性是周期等于第一透明特性的波形周期的1 /（2 ）的周期波形。 第三透明特性是周期等于第一透明特性的波形周期的1/4的周期波形。 例如，第一透明特性是在第一和第三增益峰之间延伸的1/4周期的周期波形，第二透明特性是周期性波形，其中一个周期在第一和第三增益峰之间延伸，第三透明特性是 具有在第一和第三增益峰之间延伸的两个周期的周期性波形。

公开(公告)号：US5729372A

公开(公告)日：1998-03-17

申请号：US712958

申请日：1996-09-12

申请人： Takafumi Terahara ,  Terumi Chikama ,  Masuo Suyama ,  Takao Naito

发明人： Takafumi Terahara ,  Terumi Chikama ,  Masuo Suyama ,  Takao Naito

IPC分类号： G02F1/35 ,  H01S3/10 ,  H04B1/16 ,  H04B10/2507 ,  H04B10/2563 ,  H04B10/29 ,  H04B10/291 ,  H04B10/516 ,  H04B10/61 ,  H04B10/04

CPC分类号： H04B10/2572 ,  H04B10/291 ,  H04B10/2912 ,  H04B10/2918 ,  H04B10/2939 ,  H04B1/163

摘要： The invention provides an optical transmission method and apparatus suitable for use with a terminal station apparatus for an optical communication system for a very long distance of up to several thousands kilometers across an ocean as well as an optical amplification method and apparatus suitable for use with a repeater for an optical communication system. The methods and apparatus are improved in that the excessive loss in an optical amplifier and the variation of the branching ratio are suppressed to suppress the variation of the gain to suppress the polarization dependency of the loss or the gain on a transmission line of the optical communication system. The optical transmission apparatus comprises a depolarized light source for outputting depolarized light, and an external modulator for modulating light from the depolarized light source.

公开(公告)号：US06647211B2

公开(公告)日：2003-11-11

申请号：US10067302

申请日：2002-02-07

申请人： Takafumi Terahara ,  Terumi Chikama

发明人： Takafumi Terahara ,  Terumi Chikama

IPC分类号： H04B1000

CPC分类号： H04J14/021 ,  H04B10/077 ,  H04B10/07955 ,  H04J14/02 ,  H04J14/0206 ,  H04J14/0212 ,  H04J14/0213

摘要： The invention provides a remote control device of an acousto-optic tunable filter, which comprises an acousto-optic tunable filter interpolated in an optical transmission line, capable of controlling an output state of an input light signal by being supplied with a surface acoustic wave control signal through a control port; a surface acoustic wave control signal source to generate the surface acoustic wave control signal, which is provided at a remote place from the acousto-optic tunable filter; and a control unit that receives an information of the surface acoustic wave control signal from the surface acoustic wave control signal source through remote transmission means, and supplies the surface acoustic wave control signal to the control port of the acousto-optic tunable filter. According to this invention, the scale of the device using the acousto-optic tunable filter becomes enlarged, the power consumption is increased; and the man power required for the maintenance of the devices can be reduced, and the remote control of the acousto-optic tunable filter can be achieved.

摘要翻译： 本发明提供了一种声光可调谐滤波器的遥控装置，其包括在光传输线内插的声光可调谐滤波器，能够通过提供表面声波控制来控制输入光信号的输出状态 信号通过控制端口; 表面声波控制信号源，用于产生声表面波控制信号，该声表面波控制信号设置在距离声光可调滤波器的远处; 以及控制单元，其通过远程发送装置从声表面波控制信号源接收声表面波控制信号的信息，并将声表面波控制信号提供给声光可调谐滤波器的控制端口。 根据本发明，使用声光可调谐滤波器的装置的规模变大，功耗增加; 并且可以减少维护设备所需的人力，并且可以实现声光可调谐滤波器的远程控制。

公开(公告)号：US06344914B1

公开(公告)日：2002-02-05

申请号：US08805825

申请日：1997-02-26

申请人： Naomasa Shimojoh ,  Takafumi Terahara ,  Terumi Chikama

发明人： Naomasa Shimojoh ,  Takafumi Terahara ,  Terumi Chikama

IPC分类号： H04B1002

CPC分类号： H04B10/2941 ,  H01S3/10023 ,  H01S3/1312 ,  H01S2301/04 ,  H04B10/2942 ,  H04J14/0221

摘要： A gain equalizer which equalizes gain versus wavelength characteristics of an optical amplifier. The gain versus wavelength characteristics of the optical amplifier include first, second and third gain peaks in a wavelength band with the second gain peak being between the first and third gain peaks. The optical amplifier amplifies an input signal in accordance with the gain versus wavelength characteristics to produce an output signal. The gain equalizer includes first, second and third optical filters having first, second and third transparency characteristics, respectively. The first, second and third transparency characteristics are periodic waveforms having different periods related to the wavelength difference between the first and third gain peaks. The second transparency characteristic is a periodic waveform having a period equal to 1/(2n) of the period of the waveform of the first transparency characteristic. The third transparency characteristic is a periodic waveform having a period equal to ¼ of the period of the waveform of the first transparency characteristic. For example, the first transparency characteristic is a periodic waveform with ¼ period extending between the first and third gain peaks, the second transparency characteristic is a periodic waveform with one period extending between the first and third gain peaks, and the third transparency characteristic is a periodic waveform with two periods extending between the first and third gain peaks.

摘要翻译： 增益均衡器，其均衡光放大器的增益对波长特性。 光放大器的增益对波长特性包括波长带中的第一，第二和第三增益峰值，第二增益峰值在第一和第三增益峰值之间。 光放大器根据增益对波长特性来放大输入信号以产生输出信号。 增益均衡器包括分别具有第一，第二和第三透明特性的第一，第二和第三滤光器。 第一，第二和第三透明度特征是具有与第一和第三增益峰值之间的波长差有关的不同周期的周期性波形。 第二透明特性是周期等于第一透明特性的波形的周期的1 /（2n）的周期波形。 第三透明特性是周期等于第一透明特性的波形周期的1/4的周期波形。 例如，第一透明特性是在第一和第三增益峰之间延伸的1/4周期的周期波形，第二透明特性是周期性波形，其中一个周期在第一和第三增益峰之间延伸，第三透明特性是 具有在第一和第三增益峰之间延伸的两个周期的周期性波形。

公开(公告)号：US06366379B1

公开(公告)日：2002-04-02

申请号：US09087497

申请日：1998-05-29

申请人： Takafumi Terahara ,  Terumi Chikama

发明人： Takafumi Terahara ,  Terumi Chikama

IPC分类号： H04B1000

CPC分类号： H04J14/021 ,  H04B10/077 ,  H04B10/07955 ,  H04J14/02 ,  H04J14/0206 ,  H04J14/0212 ,  H04J14/0213

摘要： A remote control device of an acousto-optic tunable filter includes an acousto-optic tunable filter, a surface acoustic wave control signal source and a control unit. The acousto-optic tunable filter receives an output light signals from an optical transmission line and has a control port to control and outputs state of the light signal received from the optical transmission line, based on a surface acoustic wave control signal received through the control port. The surface acoustic wave control signal source generates the surface acoustic wave control signal and is provided at a remote place from the acousto-optic tunable filter. The control unit receives information regarding the surface acoustic wave control signal generated by the surface acoustic wave control signal source and supplies the surface acoustic wave control signal to the control port of the acousto-optic tunable filter.

摘要翻译： 声光可调谐滤波器的遥控装置包括声光可调谐滤波器，声表面波控制信号源和控制单元。 声光可调谐滤波器接收来自光传输线的输出光信号，并且具有控制端口，用于基于通过控制端口接收的表面声波控制信号来控制和输出从光传输线接收的光信号的状态 。 表面声波控制信号源产生声表面波控制信号，并且设置在距离声光可调滤波器的远处。 控制单元接收由声表面波控制信号源产生的表面声波控制信号的信息，并将声表面波控制信号提供给声光调节滤波器的控制端口。

公开(公告)号：US5539566A

公开(公告)日：1996-07-23

申请号：US425974

申请日：1995-04-20

申请人： Takafumi Terahara ,  Terumi Chikama ,  Masuo Suyama ,  Takao Naito

发明人： Takafumi Terahara ,  Terumi Chikama ,  Masuo Suyama ,  Takao Naito

IPC分类号： G02F1/35 ,  H01S3/10 ,  H04B1/16 ,  H04B10/2507 ,  H04B10/2563 ,  H04B10/29 ,  H04B10/291 ,  H04B10/516 ,  H04B10/61 ,  H04B10/17 ,  H04B10/04

CPC分类号： H04B10/2572 ,  H04B10/291 ,  H04B10/2912 ,  H04B10/2918 ,  H04B10/2939 ,  H04B1/163

摘要： The invention provides an optical transmission method and apparatus suitable for use with a terminal station apparatus for an optical communication system for a very long distance of up to several thousands kilometers across an ocean as well as an optical amplification method and apparatus suitable for use with a repeater for an optical communication system. The methods and apparatus are improved in that the excessive loss in an optical amplifier and the variation of the branching ratio are suppressed to suppress the variation of the gain to suppress the polarization dependency of the loss or the gain on a transmission line of the optical communication system. The optical transmission apparatus comprises a depolarized light source for outputting depolarized light, and an external modulator for modulating light from the depolarized light source.

摘要翻译： 本发明提供一种光传输方法和装置，适用于通过海洋长达几千公里的远距离通信的光通信系统的终端装置，以及适于与 中继器用于光通信系统。 该方法和装置的改进在于，抑制光放大器中的过度损耗和分支比的变化，以抑制增益的变化，以抑制光通信的传输线上的损耗或增益的极化依赖性 系统。 光传输装置包括用于输出去偏振光的去极化光源和用于调制来自去偏振光源的光的外部调制器。

公开(公告)号：US06661974B1

公开(公告)日：2003-12-09

申请号：US09407369

申请日：1999-09-28

申请人： Yuichi Akiyama ,  George Ishikawa ,  Hiroki Ooi ,  Terumi Chikama

发明人： Yuichi Akiyama ,  George Ishikawa ,  Hiroki Ooi ,  Terumi Chikama

IPC分类号： H04J1402

CPC分类号： H04J14/02 ,  H04B10/2513 ,  H04B2210/254 ,  H04J14/0221

摘要： An optical transmitter having a function which compensates for wavelength dispersion is provided with a plurality of light sources for outputting light having wavelengths that differ from one another. Before the optical transmission system begins operating, the wavelength of light output to an optical transmission line is varied by changing over the light sources in order to detect a wavelength whose transmission characteristic is optimum with regard to wavelength dispersion exhibited by this optical transmission line. During system operation, the light having the detected optimum wavelength is output to the optical transmission line.

摘要翻译： 具有补偿波长色散的功能的光发射机设置有用于输出具有彼此不同的波长的光的多个光源。 在光传输系统开始工作之前，通过改变光源来改变输出到光传输线的光的波长，以便检测相对于该光传输线所表现出的波长色散的透射特性最佳的波长。 在系统操作期间，将具有检测到的最佳波长的光输出到光传输线。

公开(公告)号：US06631026B2

公开(公告)日：2003-10-07

申请号：US10227268

申请日：2002-08-26

申请人： Susumu Kinoshita ,  Terumi Chikama

发明人： Susumu Kinoshita ,  Terumi Chikama

IPC分类号： H01S300

CPC分类号： H04B10/296 ,  H01S3/094003 ,  H04B10/291 ,  H04B10/294 ,  H04J14/0221

摘要： In an optical amplifier for use in, for example, a wavelength multiplexing optical communication system, in order to allow an excitation light source to be enlargeable or removable in accordance with an increase/decrease in the number of channels in signal light even if the optical communication system is in operation, there are included an optical amplifying section (2) for amplifying and outputting inputted signal light, a plurality of excitation light sources (3, 4) and an excitation light source control section (5) for controlling operations of the excitation light sources (3, 4), wherein the excitation light sources are composed of a main excitation light source (3) and an auxiliary excitation light source (4), and the excitation light source control section (5) is equipped with a control section (7) which, when the number of channels in the inputted signal light is equal to or less than a predetermined number of channels, executes control whereby the main excitation light source (3) supplies excitation light and which executes control whereby the main excitation light source (3) and the auxiliary excitation light source (4) cooperatively supply excitation light when the number of channels in the signal light is more than the predetermined number of channels.

公开(公告)号：US5737118A

公开(公告)日：1998-04-07

申请号：US601244

申请日：1996-02-14

申请人： Yasushi Sugaya ,  Susumu Kinoshita ,  Hiroshi Onaka ,  Terumi Chikama

发明人： Yasushi Sugaya ,  Susumu Kinoshita ,  Hiroshi Onaka ,  Terumi Chikama

IPC分类号： H01S3/094 ,  H01S3/06 ,  H01S3/067 ,  H01S3/0941 ,  H01S3/10 ,  H01S3/13 ,  H01S5/042 ,  H01S5/06 ,  H01S5/068 ,  H01S5/0683 ,  H01S5/50 ,  H04B10/03 ,  H04B10/07 ,  H04B10/079 ,  H04B10/293 ,  H04B10/90 ,  H01S3/00

CPC分类号： H01S3/1301 ,  H01S5/0683 ,  H01S5/0617 ,  H01S5/06808 ,  H01S5/50

摘要： A computer-controlled optical amplifying apparatus, which includes an optical amplifying unit including an optical amplifying medium and an optical amplifying control unit controlling the optical amplifying unit under the control of a computer. This optical amplifying control unit is constituted by a status monitoring unit for monitoring the status, an optical output control unit for controlling the optical amplifying unit in accordance with the result of monitoring of status; and a status restoring unit for initializing the control status of the optical output control unit by initializing the computer when detecting an occurrence of the abnormal status by the result of monitoring of status and restoring the optical output control unit to the control status before occurrence of the related abnormal status within a relaxation time inherent in the optical amplifying medium occurring accompanied with this initialization.

摘要翻译： 一种计算机控制的光学放大装置，其包括具有光放大介质的光放大单元和在计算机的控制下控制光放大单元的光放大控制单元。 该光放大控制单元由用于监视状态的状态监视单元，根据状态监视的结果控制光放大单元的光输出控制单元构成; 以及状态恢复单元，用于通过初始化计算机的初始化来初始化光输出控制单元的控制状态，该状态恢复单元通过状态监视的结果检测到异常状态的发生，并且在发生之前将光输出控制单元恢复到控制状态 在与该初始化相关的光放大介质中固有的弛豫时间内的相关异常状态。

公开(公告)号：US5253097A

公开(公告)日：1993-10-12

申请号：US730002

申请日：1991-07-15

申请人： Takao Naito ,  Terumi Chikama ,  Shigeki Watanabe ,  Tetsuya Kiyonaga ,  Hiroshi Nakamoto ,  George Ishikawa

发明人： Takao Naito ,  Terumi Chikama ,  Shigeki Watanabe ,  Tetsuya Kiyonaga ,  Hiroshi Nakamoto ,  George Ishikawa

IPC分类号： H04B10/61 ,  H04B7/10 ,  H04B10/07 ,  H04B10/2507 ,  H04B10/516 ,  H04B10/556 ,  H04B10/564 ,  H04B10/572 ,  H04L27/227 ,  H04B10/06

CPC分类号： H04B10/61 ,  H04B10/614 ,  H04B10/64

摘要： A demodulator comprising an OR/NOR circuit, an exclusive OR/NOR circuit, and a delay circuit is disclosed as that capable of being suitably formed into a monolithic IC. Also, a polarization diversity receiver for coherent optical communication using the above demodulator as its constituent is disclosed as that having a smaller number of variable gain amplifiers and accordingly having the controlling circuit made simpler in structure.