公开(公告)号：US06400499B2

公开(公告)日：2002-06-04

申请号：US09761710

申请日：2001-01-18

申请人： Yasushi Sugaya ,  Miki Takeda ,  Susumu Kinoshita ,  Terumi Chikama

发明人： Yasushi Sugaya ,  Miki Takeda ,  Susumu Kinoshita ,  Terumi Chikama

IPC分类号： H04B1012

CPC分类号： H04B10/296 ,  H01S3/06758 ,  H01S3/10015 ,  H01S3/1301 ,  H01S3/1305 ,  H01S2301/04 ,  H04B10/2931

摘要： A multi-wavelength light amplifier includes a first-stage light amplifier which has a first light amplifying optical fiber amplifying a light input, a second-stage light amplifier which has a second light amplifying optical fiber amplifying a first light output from the first-stage light amplifier, and an optical system which maintains a second light output of the second-stage light amplifier at a constant power level. The first-stage and second-stage light amplifiers have different gain vs wavelength characteristics so that the multi-wavelength light amplifier has no wavelength-dependence of a gain thereof.

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：US06366376B1

公开(公告)日：2002-04-02

申请号：US09223563

申请日：1998-12-31

申请人： Hideyuki Miyata ,  Hiroshi Onaka ,  Terumi Chikama

发明人： Hideyuki Miyata ,  Hiroshi Onaka ,  Terumi Chikama

IPC分类号： H04J1402

CPC分类号： H04B10/2563 ,  H04J14/0224

摘要： An optical transmitting device which combines a plurality of signal lights, each having a different, corresponding, frequency, into a wavelength division multiplexed signal light. The frequencies are spaced apart from each other in a manner with eliminates the effects of four-wave mixing (FWM). More specifically, the difference in frequencies of any pair-combination of the signal lights is different from the difference in frequencies between any other pair-combination of the signal lights. Moreover, the plurality of signal lights include n signal lights having respectively corresponding frequencies f1 through fn arranged in order from f1 to fn along a frequency spectrum, where frequencies f1 through fn−1 have respectively corresponding integer spacing coefficients m1 through mn−1, and frequencies fi and fi+1 are separated by mi·&Dgr;fS−F, where i=1 to (n−1) and &Dgr;fS−F is a unit of spacing between frequencies. m1 through mn−1 are all different from each other. In addition, m1 through mn−1 and the sum of any consecutive (n−2) spacing coefficients m1 through mn−1 should all be different from each other. The sum of m1 through mn−1 can be minimized to minimize required bandwidth.

摘要翻译： 一种光发射装置，其将具有不同相应频率的多个信号光组合成波分复用信号光。 频率彼此间隔开，消除了四波混频（FWM）的影响。 更具体地，信号光的任何组合的频率差异与信号光的任何其它对组合之间的频率差异不同。 此外，多个信号光包括n个信号光，其中频率f1至fn-1分别具有对应的整数间隔系数m1至mn-1，分别具有分别对应的频率f1至fn，其频率f1至fn按频率顺序排列，并且 频率fi和fi + 1由mi.DELTAfS-F分开，其中i = 1到（n-1），DELTAfS-F是频率之间的间隔单位。 m1到mn-1都是不同的。 此外，m1至mn-1以及任何连续（n-2）个间隔系数m1至mn-1的总和应该彼此不同。 可以将m1至mn-1的总和最小化以最小化所需的带宽。

公开(公告)号：US06292289B1

公开(公告)日：2001-09-18

申请号：US09492458

申请日：2000-01-27

申请人： Yasushi Sugaya ,  Terumi Chikama

发明人： Yasushi Sugaya ,  Terumi Chikama

IPC分类号： H01S300

CPC分类号： H04B10/291 ,  H04B10/0775 ,  H04B10/0777 ,  H04B10/2972 ,  H04B2210/078 ,  H04B2210/258

摘要： The present invention relates to a method for transmitting a supervisory optical signal. A first optical amplifier for a first band (e.g., a conventional band: C band) determining a noise characteristic and a gain efficiency is provided. A second optical amplifier for a second band (e.g., a long wavelength band: L band) determining a noise characteristic and a gain efficiency is provided. The supervisory optical signal is processed in relation to one of the first and second optical amplifiers superior in at least one of the noise characteristic and the gain efficiency to the other. According to this method, undue degradation in the noise characteristic and the gain efficiency can be prevented to maintain a good transmission quality of a main signal.

摘要翻译： 本发明涉及发送监控光信号的方法。 提供了用于确定噪声特性和增益效率的第一频带（例如，常规频带：C频带）的第一光放大器。 提供了用于确定噪声特性和增益效率的第二频带（例如，长波段：L波段）的第二光放大器。 监控光信号相对于第一和第二光放大器中的一个被处理，在至少一个噪声特性和增益效率中优于另一个。 根据该方法，可以防止噪声特性和增益效率的不适当的劣化，以保持主信号的良好的传输质量。

公开(公告)号：US06285479B1

公开(公告)日：2001-09-04

申请号：US09050105

申请日：1998-03-30

申请人： Kazue Okazaki ,  Hiroshi Onaka ,  Hideyuki Miyata ,  Yutaka Kai ,  Terumi Chikama

发明人： Kazue Okazaki ,  Hiroshi Onaka ,  Hideyuki Miyata ,  Yutaka Kai ,  Terumi Chikama

IPC分类号： H04J1402

CPC分类号： H04Q11/0005 ,  H04J14/0204 ,  H04J14/0205 ,  H04J14/021 ,  H04J14/0212 ,  H04J14/0213 ,  H04J14/0217 ,  H04J14/0221 ,  H04M1/274558 ,  H04M1/274583 ,  H04M2250/60 ,  H04Q2011/0016 ,  H04Q2011/0018 ,  H04Q2011/0024 ,  H04Q2011/0045 ,  H04Q2011/0049

摘要： The present invention relates to an optical cross connect unit comprising M wavelength separating sections for receiving multiplexed optical signals each having N kinds of wavelengths different from each other through M optical fibers, respectively, and for wavelength-separating each of the multiplexed optical signals into N optical signals, M optical reproduction relay sections each for conducting an optical reproduction and relay in a manner of making a conversion of each of the N optical signals, wavelength-separated in each of the wavelength separating sections, into an electric signal and then modulating it with a desired optical wavelength, a refill section for mutually refilling M sets of optical signals optically reproduced and relayed in the optical reproduction relay sections, a focusing section for focusing the M sets of optical signals refilled in the refill section, and a light source unit for supplying input lights having desired wavelengths to be modulated in the M optical reproduction relay sections. The light source unit includes N light sources for outputting lights having the N kinds of optical wavelengths, a multiplexing and branching section for multiplexing the lights from the N light sources to produce a multiplexed light having N kinds of optical wavelength components and further for branching the multiplexed light into M×N lights to output them as multiplexed and distributed lights, M wavelength filter sections for distributively receiving N multiplexed and distributed lights of the M×N multiplexed and distributed lights branched in the multiplexing and branching section to output N lights due to the passage of only arbitrary wavelengths of the N kinds of optical wavelengths, and a wavelength setting control section for setting optical wavelengths, which pass through the wavelength filter sections, so that they differ from each other. The N lights from each of the M wavelength filter sections are supplied as the input lights. In the case that many light sources are necessary for the modulation processing by modulators or the like, this optical cross connect unit is also suitable because of using given wavelengths from a small number of light sources for a lot of modulation processing.

公开(公告)号：US5903385A

公开(公告)日：1999-05-11

申请号：US955439

申请日：1997-10-21

申请人： Yasushi Sugaya ,  Terumi Chikama

发明人： Yasushi Sugaya ,  Terumi Chikama

IPC分类号： H01S3/10 ,  H01S3/06 ,  H01S3/067 ,  H04B10/07 ,  H04B10/296 ,  H04J14/00 ,  H04J14/02 ,  G02B6/28 ,  H01J3/30 ,  H01S3/14

CPC分类号： H04B10/2942 ,  H04B10/077 ,  H04B10/07955 ,  H04B10/291 ,  H04B10/2912 ,  H04B10/2931 ,  H04B10/2935 ,  H04B10/296 ,  H04J14/0221

摘要： Multi-wavelength light is transmitted from a sending station to a receiving station. An erbium-doped optical fiber is installed on the transmission path that connects the sending station and the receiving station. Pump light is supplied from a light source installed in the receiving station to the erbium-doped optical fiber. In the receiving station, the multi-wavelength light is decomposed into the component wavelength signals. The light level of each component wavelength signal is detected, and the power of the light emitted by the light source is controlled so as to equalize those light levels.

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：US5115332A

公开(公告)日：1992-05-19

申请号：US553744

申请日：1990-07-18

申请人： Takao Naito ,  Terumi Chikama ,  Shigeki Watanabe ,  Tetsuya Kiyonaga ,  Yoshihito Onoda ,  Hideo Kuwahara

发明人： Takao Naito ,  Terumi Chikama ,  Shigeki Watanabe ,  Tetsuya Kiyonaga ,  Yoshihito Onoda ,  Hideo Kuwahara

IPC分类号： H04B10/2513 ,  H04B10/61 ,  H04B10/63 ,  H04B10/64

CPC分类号： H04B10/61 ,  H04B10/2513 ,  H04B10/613 ,  H04B10/63 ,  H04B10/64

摘要： A receiver for coherent optical communication in a phase diversity system. An optical hybrid circuit receives a signal beam and receives a local-oscillator beam which has a predetermined phase shift. The optical hybrid circuit branches each beam into pairs, each pair having one signal beam and one local-oscillator beam. These beam pairs are output to first and second photodetectors which each apply a photoelectric conversion, thus producing first and second output signals. The output signals are output to an electrical 90.degree. hybrid circuit which shifts the first signal by 90.degree. and adds it to the second signal to produce a first output signal, and shifts the second signal by 90.degree. and adds it to the first signal to produce a second output signal. The first and second output signals are applied to first and second demodulators, respectively, which delay the signals by a delay corresponding to their frequency. The demodulators output the delayed signals to an adder which adds the two signals to produce an output signal. As a result, the receiver is capable of compensating the wavelength dispension is an optical fiber to secure an enhanced receiving sensitivity.

公开(公告)号：US5052051A

公开(公告)日：1991-09-24

申请号：US424732

申请日：1989-10-20

申请人： Takao Naito ,  Terumi Chikama ,  Shigeki Watanabe ,  Tetsuya Kiyonaga ,  Yoshihito Onoda

发明人： Takao Naito ,  Terumi Chikama ,  Shigeki Watanabe ,  Tetsuya Kiyonaga ,  Yoshihito Onoda

IPC分类号： G02F2/00 ,  H04B10/07 ,  H04B10/516 ,  H04B10/61

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

摘要： After mixing the signal light and the local oscillation light with a mixing circuit, two intersecting polarization components are divided by a polarization splitter and respective components are subjected to heterodyne detection by optical receivers. Thereafter, in an electric signal stage, the intermediate frequency signal outputted from the optical receivers are applied to a 90-degree hybrid coupler and the output signal from one of the output ports is demodulated by a demodulator. On the other hand, an intermediate frequency signal outputted from the optical receivers are subjected to a subtraction to provide a principal axis angle monitor signal for the signal light. The signal outputted from the output port from the 90-degree hybrid coupler is used to monitor the elliptic ratio of the signal light and these monitor signals are applied to the polarization control circuit. The polarization control circuit drives the polarization operation apparatus based on said monitor signal to control the polarization state (i.e. a principal axis angle and the elliptic ratio) of the signal light to achieve the optimum state.

公开(公告)号：US08320040B2

公开(公告)日：2012-11-27

申请号：US13177065

申请日：2011-07-06

申请人： Yasushi Sugaya ,  Miki Takeda ,  Susumu Kinoshita ,  Terumi Chikama

发明人： Yasushi Sugaya ,  Miki Takeda ,  Susumu Kinoshita ,  Terumi Chikama

IPC分类号： H01S3/00

CPC分类号： H04B10/296 ,  H01S3/06758 ,  H01S3/10015 ,  H01S3/1301 ,  H01S3/1305 ,  H01S2301/04 ,  H04B10/2931

摘要： A multi-wavelength light amplifier includes a first-stage light amplifier which has a first light amplifying optical fiber amplifying a light input, a second stage light amplifier which has a second light amplifying optical fiber amplifying a first light output from the first-stage light amplifier, and an optical system which maintains a second light output of the second-stage light amplifier at a constant power level. The first-stage and second-stage light amplifiers have different gain vs wavelength characteristics so that the multi-wavelength light amplifier has no wavelength-dependence of a gain thereof.

摘要翻译： 多波长光放大器包括具有放大光输入的第一放大光纤的第一级光放大器，具有放大从第一级光输出的第一光输出的第二光放大光纤的第二级光放大器 放大器和将第二级光放大器的第二光输出维持在恒定功率电平的光学系统。 第一级和第二级光放大器具有不同的增益与波长特性，使得多波长光放大器与其增益没有波长依赖性。