公开(公告)号：US20090208224A1

公开(公告)日：2009-08-20

申请号：US12300212

申请日：2006-05-11

Applicant: Nobuhiko Kikuchi

Inventor： Nobuhiko Kikuchi

IPC: H04B10/12 ,  H04B10/06

CPC classification number: H04B10/672 ,  H04B10/69 ,  H04L7/0008 ,  H04L7/0075

Abstract: An optical field receiver comprises an optical branching circuit for branching a received optical multilevel signal into first and second optical signals, a first optical delayed demodulator for performing delayed demodulation on the first optical signal at a delay time T (T=symbol time), a second optical delayed demodulator for performing delayed demodulation on the second optical signal at the delay time T with an optical phase difference deviating from the first optical delayed demodulator by 90°, first and second optical receivers for converting each of the delayed demodulation signals representing x and y components of complex signals output from the first and second delayed demodulators into first and second electrical signals, and a field processing unit fort generating a first reconstructed signal representing an inter-symbol phase difference or a phase angle of a received symbol from the first and second electrical signals for each symbol time T.

Abstract translation: 一种光场接收机包括一个用于将接收的光多值信号分支为第一和第二光信号的光分支电路，用于在延迟时间T（T =符号时间）下对第一光信号执行延迟解调的第一光延迟解调器， 第二光延迟解调器，用于以延迟时间T对第二光信号执行延迟解调，光偏移与第一光延迟解调器相差90°;第一和第二光接收机，用于转换表示x和 从第一和第二延迟解调器输出的复信号的y个分量转换成第一和第二电信号;以及场处理单元，其生成表示来自第一和第二电信号的接收符号的符号间相位差或相位角的第一重构信号， 每个符号时间T的第二个电信号。

公开(公告)号：US20070046952A1

公开(公告)日：2007-03-01

申请号：US11511221

申请日：2006-08-29

Applicant: Nobuhiko Kikuchi

Inventor： Nobuhiko Kikuchi

IPC: G01B9/02 ,  G01B11/02

CPC classification number: G01J9/02 ,  G01J11/00

Abstract: An electric field waveform of an optical signal is precisely measured with high time resolution. Particularly, determination of inter-symbol interference has been difficult. Output light from the laser source is divided into first and second portions. The first portion is modulated by an optical modulator. The second portion is delayed by a delay line for the same quantity of delay as that of the first portion. The first and second portions are fed to a phase diversity circuit to configure a homodyne interferometer. An optical input sampling oscilloscope stabilizes a variable optical phase shifter to set an optical phase at a particular point of time to a fixed value using a pattern sync signal as a reference. An optical input sampling oscilloscope repeatedly averages optical waveforms and a CPU conducts three-dimensional display of the optical electric field waveform from which noise has been removed.

Abstract translation: 以高时间分辨率精确测量光信号的电场波形。 特别地，确定符号间干扰是困难的。 来自激光源的输出光被分成第一和第二部分。 第一部分由光学调制器调制。 第二部分延迟与第一部分相同数量的延迟延迟线。 第一和第二部分被馈送到相位分集电路以配置零差干涉仪。 光输入采样示波器稳定可变光移相器，使用图案同步信号作为参考，将特定时间点的光相位设置为固定值。 光输入采样示波器重复地对光波形进行平均，CPU执行已消除噪声的光电波形的三维显示。

公开(公告)号：US20050175041A1

公开(公告)日：2005-08-11

申请号：US10888016

申请日：2004-07-12

Applicant: Shinya Sasaki ,  Nobuhiko Kikuchi ,  Kenro Sekine

Inventor： Shinya Sasaki ,  Nobuhiko Kikuchi ,  Kenro Sekine

IPC: H04B10/00 ,  H04B10/27 ,  H04B10/29 ,  H04J14/00 ,  H04J14/02

CPC classification number: H04J14/0216 ,  H04J14/0212 ,  H04J14/0217

Abstract: A problem to be solved in an optical communication system for carrying out bidirectional transmission between communication nodes by wavelength-division-multiplexed optical signals is that a plurality of optical add-drop multiplexers installed in the communication nodes are required for each transmission direction, and therefore, the communication cost is increased. An optical circulator or an optical coupler is arranged at an input/output port of the optical add-drop multiplexer and the wavelength-division-multiplexed optical signals are assembled for each transmission direction, whereby optical signals transmitted bidirectionally can be handled by one optical add-drop multiplexer.

Abstract translation: 用于通过波分复用光信号在通信节点之间进行双向传输的光通信系统中要解决的问题在于，每个传输方向都需要安装在通信节点中的多个光分插复用器，因此 通信成本增加。 在光分插复用器的输入/输出端口处设置光环行器或光耦合器，并且为每个传输方向组合波分复用光信号，由此双向传输的光信号可以通过一个光学加法 - 多路复用器

公开(公告)号：US06891659B2

公开(公告)日：2005-05-10

申请号：US09796617

申请日：2001-03-02

Applicant: Nobuhiko Kikuchi

Inventor： Nobuhiko Kikuchi

IPC: G02F1/35 ,  H01S3/00 ,  H01S3/06 ,  H01S3/067 ,  H01S3/30

CPC classification number: H04B10/2916 ,  H01S3/06754 ,  H01S3/094011 ,  H01S3/10015 ,  H01S3/302

Abstract: An object of the present invention is to prevent an interruption circuit of an optical amplifier from malfunctioning due to Raman pump wave. A typical mode of the present invention is characterized in that an pump wave elimination filter is inserted before an input-light detector and a reflected-light detector which constitute the optical amplifier. This permits only a signal component to be detected, enabling interruption operation, while eliminating a remaining component of Raman pump wave transmitted from for example a downstream of an optical fiber transmission line. In addition, a judgment threshold value for the interruption operation is changed according to ON/OFF condition of the pump wave. Or the Raman pump wave itself is used for detecting output's open.

Abstract translation: 本发明的目的是防止光放大器的中断电路由于拉曼泵浦波而发生故障。 本发明的典型模式的特征在于，在构成光放大器的输入光检测器和反射光检测器之前插入泵浦滤波器。 这允许仅检测信号分量，从而能够中断操作，同时消除从例如光纤传输线的下游传输的拉曼泵波的剩余分量。 此外，中断动作的判定阈值根据泵浦波的ON / OFF状态而变化。 或者拉曼泵浦波本身用于检测输出的开路。

公开(公告)号：US08855503B2

公开(公告)日：2014-10-07

申请号：US13808488

申请日：2010-07-09

Applicant: Nobuhiko Kikuchi

Inventor： Nobuhiko Kikuchi

IPC: H04B10/61 ,  H04B10/00 ,  H04B10/69 ,  H04B10/67 ,  H04B10/60

CPC classification number: H04B10/00 ,  H04B10/60 ,  H04B10/612 ,  H04B10/677 ,  H04B10/697

Abstract: Optical receiver 300 uses two optical delay detectors 223 (set such that the delay times T are equal to symbol time and the phase differences are zero and 90 degrees) to receive an optical multilevel signal 215 and the output signals are A/D converted, thereafter subjected to retiming processes, and then subjected to a differential phase detection, thereby detecting a differential phase at a symbol center time point. In the receiver, the detected differential phase is integrated for each symbol and thereafter combined with an amplitude component obtained from a separately disposed optical intensity receiver, thereby reproducing an optical electric field. Thereafter, a wavelength dispersion compensation circuit (231) of a time period T is used to compensate for the wavelength dispersion of the transmission path. Moreover, an electric or optical Nyquist filter may be inserted to perform a band limitation, thereby enhancing the wavelength dispersion compensation effect.

Abstract translation: 光接收器300使用两个光学延迟检测器223（设置为延迟时间T等于符号时间，相位差为零和90度），以接收光学多电平信号215，然后将输出信号进行A / D转换 进行重新定时处理，然后进行差分相位检测，从而检测符号中心时间点的差分相位。 在接收机中，检测到的差分相位对于每个符号被积分，然后与从单独设置的光强度接收器获得的振幅分量相结合，从而再现光电场。 此后，使用时间段T的波长色散补偿电路（231）来补偿传输路径的波长色散。 此外，可以插入电或光奈奎斯特滤波器来执行频带限制，从而增强波长色散补偿效果。

公开(公告)号：US08805188B2

公开(公告)日：2014-08-12

申请号：US13301893

申请日：2011-11-22

Applicant: Nobuhiko Kikuchi

Inventor： Nobuhiko Kikuchi

IPC: H04J14/06

CPC classification number: H04J14/06 ,  H04B10/532 ,  H04B10/614

Abstract: There is a need to prevent two receivers from converging on a state of receiving the same polarization state, fast start receivers, and ensure highly reliable operations. A polarization-multiplexed transmitter previously applies frequency shifts of frequencies +Δf and −Δf to X-polarization and Y-polarization digital information signals to be transmitted. Optical field modulators modulate and polarization-multiplex the signals. As a result, a frequency difference of 2Δf is supplied to X-polarization and Y-polarization components. A polarization diversity coherent optical receiver 215 receives the signal. A frequency estimation portion in a digital signal processing circuit detects a frequency difference signal in both polarization components. This signal is used to a polarization splitting circuit in the digital signal processing circuit.

Abstract translation: 需要防止两个接收器在接收相同极化状态的状态下收敛，快速启动接收机，并确保高度可靠的操作。 偏振复用发射机先前将频率+＆Dgr; f和 - ＆Dgr; f的频移应用于要发送的X极化和Y极化数字信息信号。 光场调制器对信号进行调制和极化复用。 结果，向X极化和Y偏振分量提供2＆Dgr; f的频率差。 极化分集相干光接收器215接收该信号。 数字信号处理电路中的频率估计部分检测两个偏振分量中的频差信号。 该信号用于数字信号处理电路中的偏振分离电路。

公开(公告)号：US08693886B2

公开(公告)日：2014-04-08

申请号：US13520730

申请日：2010-01-07

Applicant: Nobuhiko Kikuchi

Inventor： Nobuhiko Kikuchi

IPC: H04B10/00 ,  H04B10/12 ,  H04B10/06

CPC classification number: H04B10/6971 ,  H04B10/5561 ,  H04B10/677

Abstract: In an optical multilevel transmitter (210), a polar representation of an optical multilevel signal (r, φ) is generated by a polar coordinate multilevel signal generation circuit (212), input to an optical amplitude modulator (211) and a polar coordinate type optical phase modulator (201), and output as an optical multilevel modulated signal (213). The polar coordinate type optical phase modulator (201) generates an optical phase rotation proportional to an input voltage, so the modulation distortion of the electric signal is transferred in a linear form to the optical phases of the optical multilevel modulated signal (213). In an optical multilevel receiver (219), a received signal is input to two sets of optical delay detectors (133) and balance receivers (134) and directly demodulated, and a differential phase Δφ for the received signal is calculated by arctangent computation from the output signal. In a phase adaptive equalizer (205), the modulation distortion of the phase is removed by adaptive equalization of the differential phase Δφ. By separately receiving the amplitude components and combining them, the modulation distortion is removed and highly sensitive optical multilevel transmission is achieved.

Abstract translation: 在光学多电平发射机（210）中，通过极坐标多电平信号产生电路（212）产生光学多电平信号（r，＆phgr）的极性表示，输入到光学幅度调制器（211）和极坐标 型光学相位调制器（201），并作为光学多级调制信号（213）输出。 极坐标型光相位调制器（201）产生与输入电压成比例的光相位旋转，因此电信号的调制失真以线性形式传送到光学多层调制信号（213）的光学相位。 在光学多电平接收器（219）中，接收信号被输入到两组光学延迟检测器（133）和平衡接收器（134）并被直接解调，并且差分相位＆Dgr＆amp; 对于接收信号，通过输出信号的反正切运算来计算。 在相位自适应均衡器（205）中，相位的调制失真通过差分相位＆Dgr＆amp; phgr的自适应均衡来消除。 通过分别接收振幅分量并进行组合，消除了调制失真，实现了高灵敏度的光学多层传输。

公开(公告)号：US08483573B2

公开(公告)日：2013-07-09

申请号：US12987636

申请日：2011-01-10

Applicant: Hideaki Kotake ,  Nobuhiko Kikuchi ,  Kohei Mandai

Inventor： Hideaki Kotake ,  Nobuhiko Kikuchi ,  Kohei Mandai

IPC: H04B10/00 ,  H04B10/06

CPC classification number: H04J14/06 ,  H04B10/2572 ,  H04B10/532 ,  H04B10/60 ,  H04B10/611 ,  H04B10/6161 ,  H04B10/6162

Abstract: An optical signal of an optical transmission part is brought into a high-speed polarization scrambling state by a polarization scrambling part, and transmitted to en optical fiber transmission line as the optical signal from the optical transmitter. The optical signal passing through the optical fiber transmission line is inputted to an optical receiver. The optical signal inputted to the optical receiver is converted into an electric signal by a polarization dependent photoelectric detection part. The converted electric signal is inputted to a digital signal processing part having a polarization scrambling cancel part of canceling the polarization scrambling state by a digital signal processing operation. At the digital signal processing part, the polarization scrambling state of the electric signal is canceled, and a data signal is outputted.

Abstract translation: 光传输部分的光信号由偏振加扰部分进入高速偏振加扰状态，并作为来自光发送器的光信号传输到光纤传输线。 通过光纤传输线的光信号被输入到光接收机。 输入到光接收机的光信号由偏振相关的光电检测部分转换为电信号。 转换的电信号被输入到具有通过数字信号处理操作来消除偏振加扰状态的偏振加扰取消部分的数字信号处理部分。 在数字信号处理部分，消除电信号的偏振加扰状态，并输出数据信号。

公开(公告)号：US08417126B2

公开(公告)日：2013-04-09

申请号：US12985455

申请日：2011-01-06

Applicant: Kohei Mandai ,  Nobuhiko Kikuchi ,  Shinya Sasaki

Inventor： Kohei Mandai ,  Nobuhiko Kikuchi ,  Shinya Sasaki

IPC: H04B10/04

CPC classification number: H04J14/06

Abstract: A polarization multiplexing transmitter which generates polarization-multiplexed signals which are arbitrarily polarization-scrambled at high speed, without adding a polarization modulator and a polarization scrambler. In the transmitter, an orthogonally polarized signal generator includes two optical modulators which modulate the electric fields of optical signals and generate two optical signals with mutually orthogonal polarized waves. The transmitter includes electric field mappers which convert two data strings into electric field signals, polarization mappers which give different polarized waves to the two signals, polarization rotators which rotate the polarized waves of the signals uniformly, a polarization multiplexer which multiplexes the two polarization-rotated signals, a polarization demultiplexer which demultiplexes the multiplexed signal into polarized wave components of optical signals generated by the orthogonally polarized signal generator, and a driver. The optical modulators are driven to make the two demultiplexed electric field signals consistent with the electric fields of optical signals modulated by the modulators.

Abstract translation: 一种偏振复用发送器，其生成以高速任意偏振加扰的偏振复用信号，而不添加偏振调制器和偏振加扰器。 在发射机中，正交极化信号发生器包括调制光信号的电场并产生具有相互正交的极化波的两个光信号的两个光调制器。 发射机包括将两个数据串转换为电场信号的电场映射器，向两个信号提供不同极化波的偏振映射器，使信号的偏振波均匀旋转的偏振旋转器，多路复用两个偏振旋转 信号，将多路复用信号解复用为由正交偏振信号发生器产生的光信号的偏振波分量的偏振解复用器和驱动器。 驱动光调制器以使两个解复用的电场信号与由调制器调制的光信号的电场一致。

公开(公告)号：US20110182589A1

公开(公告)日：2011-07-28

申请号：US12987636

申请日：2011-01-10

Applicant: Hideaki KOTAKE ,  Nobuhiko Kikuchi ,  Kohei Mandai

Inventor： Hideaki KOTAKE ,  Nobuhiko Kikuchi ,  Kohei Mandai

IPC: H04B10/00

CPC classification number: H04J14/06 ,  H04B10/2572 ,  H04B10/532 ,  H04B10/60 ,  H04B10/611 ,  H04B10/6161 ,  H04B10/6162

Abstract: An optical signal of an optical transmission part is brought into a high-speed polarization scrambling state by a polarization scrambling part, and transmitted to en optical fiber transmission line as the optical signal from the optical transmitter. The optical signal passing through the optical fiber transmission line is inputted to an optical receiver. The optical signal inputted to the optical receiver is converted into an electric signal by a polarization dependent photoelectric detection part. The converted electric signal is inputted to a digital signal processing part having a polarization scrambling cancel part of canceling the polarization scrambling state by a digital signal processing operation. At the digital signal processing part, the polarization scrambling state of the electric signal is canceled, and a data signal is outputted.

Abstract translation: 光传输部分的光信号由偏振加扰部分进入高速偏振加扰状态，并作为来自光发送器的光信号传输到光纤传输线。 通过光纤传输线的光信号被输入到光接收机。 输入到光接收机的光信号由偏振相关的光电检测部分转换为电信号。 转换的电信号被输入到具有通过数字信号处理操作来消除偏振加扰状态的偏振加扰取消部分的数字信号处理部分。 在数字信号处理部分，消除电信号的偏振加扰状态，并输出数据信号。