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1. 发明授权

US4965858A Polarization diversity optical receiver for coherent optical communication 失效
标题翻译：用于相干光通信的极化分集光接收机
公开(公告)号：US4965858A
公开(公告)日：1990-10-23
申请号：US310628
申请日：1989-02-14
申请人： Takao Naito , Terumi Chikama , Shigeki Watanabe , Tetsuya Kiyonaga , Yoshihito Onoda , Hideo Kuwahara , Hiroshi Onaka , Hideyuki Miyata
发明人： Takao Naito , Terumi Chikama , Shigeki Watanabe , Tetsuya Kiyonaga , Yoshihito Onoda , Hideo Kuwahara , Hiroshi Onaka , Hideyuki Miyata
IPC分类号： G02F2/00 , H04B10/25 , H04B10/516 , H04B10/564 , H04B10/61
CPC分类号： H04B10/61 , H04B10/614 , H04B10/64
摘要： A polarized wave diversity optical receiver for coherent optical communication including: an optical local oscillating circuit (7) for oscillating local oscillating light; a mixing circuit (8) for mixing signal light and the local oscillating light to obtain two polarized components; a detecting circuit (9) for detecting the polarized component to output intermediate frequency signals (e.sub.S and e.sub.P); and a frequency control circuit (11) for controlling, in accordance with the intermediate frequency signals (e.sub.S and e.sub.P), the oscillating frequency of the optical local oscillating circuit (7). To ensure that the intermediate frequency does not disappear, the frequency control circuit (11) outputs a combined signal of a sum and a difference of the intermediate frequency signals (e.sub.S and e.sub.P).

2. 发明授权

US5050176A Direct modulation phase-shift-keying system and method 失效
标题翻译：直接调制相移键控系统及方法
公开(公告)号：US5050176A
公开(公告)日：1991-09-17
申请号：US540284
申请日：1990-06-19
申请人： Takao Naito , Terumi Chikama , Shigeki Watanabe , Tetsuya Kiyonaga , Hiroshi Onaka , Yoshihito Onoda
发明人： Takao Naito , Terumi Chikama , Shigeki Watanabe , Tetsuya Kiyonaga , Hiroshi Onaka , Yoshihito Onoda
IPC分类号： H01S3/10 , H04B10/516 , H04B10/556 , H04B10/61 , H04L27/20 , H04L27/22 , H04L27/227 , H04L27/233
CPC分类号： H04L27/2331 , H04B10/50 , H04B10/504 , H04B10/5561 , H04B10/60 , H04B10/64 , H04L27/2096 , H04L27/223 , H04L27/2276
摘要： A direct modulation PSK system and method, in a coherent optical fiber transmission system, in which an injection current supplied to a laser diode is adapted to be directly varied is disclosed. In this system or method, a modulating current pulse is superposed on a bias current for the laser diode so that a specified phase condition may be satisfied. Thereby, a differential coding circuit and an external modulator being indispensable for a DPSK system become unnecessary and, in addition, the system becomes less susceptible to the influence of wavelength dispersion than the DPSK system and able to reproduce the carrier.

3. 发明授权

US5115332A Receiver for coherent optical communication 失效
标题翻译：接收器进行相干光通信
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.

4. 发明授权

US5052051A Heterodyne receiver for coherent optical communication 失效
标题翻译：用于相干光通信的外差接收机
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.

5. 发明授权

US5875054A Bidirectional optical amplifier circuit 失效
标题翻译：双向光放大器电路
公开(公告)号：US5875054A
公开(公告)日：1999-02-23
申请号：US690794
申请日：1996-08-01
申请人： Yoshihito Onoda , Terumi Chikama
发明人： Yoshihito Onoda , Terumi Chikama
IPC分类号： H01S3/07 , H01S3/06 , H01S3/067 , H01S3/094 , H01S3/0941 , H01S3/10 , H01S3/17 , H04B10/00 , H04B10/079 , H04B10/293 , H04B10/297 , H04B10/40 , H04B10/50 , H04B10/60 , G02F1/35 , H01S3/131 , H04B10/12
CPC分类号： H04B10/2972
摘要： Disclosed is a bidirectional optical amplifier circuit having a function that achieves reliable detection of reflections from an exposed end at low cost. Received optical power is detected; if the detected power is less than a prescribed discrimination level, it is then decided that the detected light is not received signal light but transmitted signal light sent in the direction opposite from it and reflected at an exposed fiber end, and the bias current for a laser diode in the opposite path is reduced to lower the optical output level of an EDF.
摘要翻译：公开了一种双向光放大器电路，其具有以低成本可靠地检测来自暴露端的反射的功能。检测到接收到的光功率; 如果检测到的功率小于规定的识别电平，则判定所检测的光未被接收到信号光，而是在与其相反的方向上发射并在曝光的光纤端反射的发射信号光，相反路径上的激光二极管减少以降低EDF的光输出电平。

6. 发明授权

US6111688A Optical amplifier and system including the same 失效
标题翻译：光放大器和系统包括相同
公开(公告)号：US6111688A
公开(公告)日：2000-08-29
申请号：US198566
申请日：1998-11-23
申请人： Taiki Kobayashi , Yoshihito Onoda , Tadashi Okiyama
发明人： Taiki Kobayashi , Yoshihito Onoda , Tadashi Okiyama
IPC分类号： H01S3/10 , H01S3/06 , H01S3/094 , H01S3/13 , H01S3/131 , H01S3/00
CPC分类号： H01S3/094003 , H01S3/1301 , H01S2301/04 , H01S3/09408 , H01S3/10015 , H01S3/1003
摘要： Disclosed herein is an optical amplifier including an optical amplifying medium, a pumping source, an optical filter, and a control unit. Signal light is supplied to the optical amplifying medium. The pumping source supplies pump light to the optical amplifying medium so that the optical amplifying medium provides a gain band including the wavelength of the signal light. The optical filter is optically connected between the optical amplifying medium and the pumping source, and has wavelength selectivity depending upon temperature. The control unit controls the temperature of the optical filter according to a control signal given to the control unit. The wavelength characteristic of gain in the gain band provided by the optical amplifying medium changes according to the power of the signal light and the power and center wavelength of the pump light. When the temperature of the optical filter changes, the wavelength selectivity of the optical filter changes, so that the center wavelength of the pump light changes. Accordingly, the gain tilt of the optical amplifier can be adjusted.
摘要翻译：本文公开了一种包括光放大介质，泵浦源，滤光器和控制单元的光放大器。信号光被提供给光放大介质。泵浦源将光源提供给光放大介质，使得光放大介质提供包括信号光波长的增益带。光学滤波器光学连接在光学放大介质和泵浦源之间，并且具有取决于温度的波长选择性。控制单元根据给予控制单元的控制信号来控制滤光器的温度。由光放大介质提供的增益带的增益的波长特性根据信号光的功率和泵浦光的功率和中心波长而变化。当光滤波器的温度变化时，滤光器的波长选择性发生变化，使得泵浦光的中心波长发生变化。因此，可以调整光放大器的增益倾斜。

7. 再颁专利

USRE44881E1 Optical amplifier and an optical amplification method 有权
标题翻译：光放大器和光放大法
公开(公告)号：USRE44881E1
公开(公告)日：2014-05-06
申请号：US10686514
申请日：2003-10-16
申请人： Hideaki Sugiya , Yoshihito Onoda
发明人： Hideaki Sugiya , Yoshihito Onoda
IPC分类号： H01S3/30 , H01S3/09
CPC分类号： H04B10/2912 , H01S3/06758 , H01S3/10015 , H01S3/1301 , H04B10/291 , H04B10/2931 , H04B2210/003
摘要： Two rare earth-doped optical fibers are connected in series and used to amplify input light. A splitter is installed between these two rare earth-doped optical fibers. The input light is monitored by having the portion of the input light that is branched off, by the splitter received by a photodiode. Excitation light output from a laser light source is guided by optical couplers and supplied to the above rare earth-doped optical fibers. A control circuit controls the output light level and, at the same time, stops the output from the laser light source when the input light level drops below a specified threshold value. The gain of the first stage rare earth-doped optical fiber while excitation light is being supplied is larger than the loss that occurs due to branching of the input light by the splitter.
摘要翻译：两个稀土掺杂光纤串联连接，用于放大输入光。这两种稀土掺杂光纤之间安装有分路器。通过由光电二极管接收的分路器使输入光的一部分被分支来监测输入光。从激光源输出的激发光由光耦合器引导并提供给上述稀土掺杂光纤。控制电路控制输出光电平，并且当输入光电平降低到指定阈值以下时，同时停止来自激光光源的输出。当提供激发光时，第一级稀土掺杂光纤的增益大于由于分路器的输入光的分支而发生的损耗。

8. 发明授权

US06411429B1 Optical amplifying apparatus, wide-band optical amplifying apparatus, and optical communication system 有权
标题翻译：光放大装置，宽带光放大装置及光通信系统
公开(公告)号：US06411429B1
公开(公告)日：2002-06-25
申请号：US09667433
申请日：2000-09-22
申请人： Hiroaki Tomofuji , Motoyoshi Sekiya , Takeshi Sakamoto , Makoto Murakami , Chihiro Ohshima , Yoshihito Onoda
发明人： Hiroaki Tomofuji , Motoyoshi Sekiya , Takeshi Sakamoto , Makoto Murakami , Chihiro Ohshima , Yoshihito Onoda
IPC分类号： H01S300
CPC分类号： H04B10/296 , H01S3/067 , H01S3/06758 , H04B10/2931 , H04B2210/258
摘要： An optical amplifying apparatus for widening the input dynamic range and lowering noises. The optical amplifying apparatus comprises a first optical amplifier, an optical attenuator, a second optical amplifier and a controller. The first optical amplifier changes the target value of output light when the variance amount of input light reaches a predetermined value. The controller changes the attenuation amount of attenuator in accordance with a difference between the target value and the changed target value of the output light level of the first optical amplifier, when the target value of the output light level of the first optical amplifier is changed.
摘要翻译：一种用于扩大输入动态范围并降低噪声的光学放大装置。光放大装置包括第一光放大器，光衰减器，第二光放大器和控制器。当输入光的变化量达到预定值时，第一光学放大器改变输出光的目标值。当第一光放大器的输出光电平的目标值改变时，控制器根据目标值与第一光放大器的输出光电平的改变的目标值之间的差异来改变衰减器的衰减量。

9. 发明授权

US5822112A Control apparatus for optical amplifier 失效
标题翻译：光放大器控制装置
公开(公告)号：US5822112A
公开(公告)日：1998-10-13
申请号：US630074
申请日：1996-04-15
申请人： Hiroyuki Itou , Michikazu Shima , Yoshihito Onoda , Yuji Tamura
发明人： Hiroyuki Itou , Michikazu Shima , Yoshihito Onoda , Yuji Tamura
IPC分类号： G02F1/35 , H01S3/06 , H01S3/067 , H01S3/10 , H01S3/13 , H01S3/131 , H04B10/07 , H04B10/29 , H04B10/294 , H04B10/12
CPC分类号： H01S3/1301 , H01S3/06754 , H01S3/10015 , H01S3/1305
摘要： A control apparatus for an optical amplifier such as an erbium-doped optical-fiber (EDF) amplifier suppresses overshooting of ALC control at power on and at the time of input light restoration from an off condition, while ensuring quick starting. At power on and at the time of input light restoration from an off condition, an idling current (IDC) reference value generating circuit generates an IDC reference voltage that increases to a value sufficiently greater than a value in a normal operating condition with a time constant corresponding to a rise time of the EDF, and thereby controls a laser diode for pumping the EDF. The voltage may be set to a value larger than the value in the normal operating condition for a predetermined period of time by using a timer.
摘要翻译：用于诸如掺铒光纤（EDF）放大器的光放大器的控制装置在确保快速启动的同时，抑制上电时和从关闭状态输入光恢复时的ALC控制的过冲。在上电时和从关闭状态输入光恢复时，怠速电流（IDC）参考值产生电路产生IDC参考电压，该电压增加到充分大于正常工作状态下的时间常数值对应于EDF的上升时间，从而控制用于泵浦EDF的激光二极管。通过使用定时器，将电压设定为大于正常工作状态的值达预定时间段的值。

10. 发明授权

US06738184B2 Optical amplifier for amplifying multi-wavelength light 有权
标题翻译：用于放大多波长光的光放大器
公开(公告)号：US06738184B2
公开(公告)日：2004-05-18
申请号：US09949873
申请日：2001-09-12
申请人： Etsuko Hayashi , Yasushi Sugaya , Yoshihito Onoda , Keiko Sasaki
发明人： Etsuko Hayashi , Yasushi Sugaya , Yoshihito Onoda , Keiko Sasaki
IPC分类号： H04B1012
CPC分类号： H01S3/06754 , H01S3/094011
摘要： Optical signals (multi-wavelength light) are guided to an EDF. The EDF is supplied with pump light generated by a first and a second pump light sources. Dummy light is generated by a dummy light source and supplied to the EDF. The wavelength of the dummy light is shorter than a wavelength range in which the optical signals are allocated.
摘要翻译：光信号（多波长光）被引导到EDF。 EDF被提供有由第一和第二泵浦光源产生的泵浦光。虚拟光由虚拟光源产生并提供给EDF。虚拟光的波长比分配光信号的波长范围短。

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