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1. 发明申请

US20180267340A1 BIAS CONTROL OF OPTICAL MODULATORS 审中-公开
公开(公告)号：US20180267340A1
公开(公告)日：2018-09-20
申请号：US15810671
申请日：2017-11-13
申请人： Elenion Technologies, LLC
发明人： Bernd-Harald Horst Jurgen Rohde
IPC分类号： G02F1/01 , G02F1/225 , H04B10/079 , H04B10/556 , H04L27/20
CPC分类号： G02F1/0123 , G02F1/225 , G02F2001/212 , H04B10/07955 , H04B10/5053 , H04B10/50577 , H04B10/5561 , H04L27/2096
摘要： An optical IQ modulator with automatic bias control is disclosed. A dither signal is applied to the modulator bias and its signature detected in light tapped from an output of the modulator using a phase sensitive dither detector such as a lock-in amplifier. The detected signal is processed using pre-recorded information defining the direction of the detected signal change relative to a change in the modulator bias, and the bias is adjusted in the direction determined using the information. The IQ phase bias is controlled by dithering I and Q optical signals in quadrature to produce opposite-sign single subband modulation of output light at two different dither frequencies, and detecting an oscillation at a difference frequency using a lock-in detector.

2. 发明申请

US20180219631A1 OPTICAL COMMUNICATION APPARATUS AND OPTICAL COMMUNICATION SYSTEM 审中-公开
公开(公告)号：US20180219631A1
公开(公告)日：2018-08-02
申请号：US15876701
申请日：2018-01-22
申请人： FUJITSU LIMITED
发明人： Takashi Shiraishi
IPC分类号： H04B10/50 , H01S3/067 , H01S3/094
CPC分类号： H04B10/50577 , H01S3/06779 , H01S3/094042 , H04B10/504 , H04B10/50572 , H04B10/564
摘要： An optical communication apparatus includes: a light-receiving device that receives an optical signal transmitted from another optical communication apparatus through an optical fiber and converts the optical signal into an electrical signal; a first measurement circuit that measures an average power and a modulation power of the optical signal based on the electrical signal; a light-emitting device that transmits the optical signal to the another optical communication apparatus by emitting light in accordance with a driving current; a driver that causes the light-emitting device to transmit the optical signal according to a transmission signal by controlling the driving current based on the transmission signal; and a processor that adjusts the driving current based on the average power and the modulation power.

3. 发明申请

US20180016893A1 DOWNHOLE TELEMETRY USING ADAPTIVE FEEDBACK 审中-公开
公开(公告)号：US20180016893A1
公开(公告)日：2018-01-18
申请号：US15304415
申请日：2015-12-03
申请人： HALLIBURTON ENERGY SERVICES, INC.
发明人： Satyan Gopal BHONGALE , Daniel Joshua STARK
IPC分类号： E21B47/12 , H04B10/69 , H04B10/50
CPC分类号： E21B47/123 , E21B47/12 , H04B10/50577 , H04B10/63 , H04B10/697
摘要： Systems, methods, and computer-readable media for providing adaptive feedback in downhole telemetry in a wellbore. A feedback system includes a source assembly, which can be located on the surface or downhole, and a receiving assembly, which can likewise be located on the surface or downhole. The source assembly includes a source device that transmits a light signal having a first phase, and an encoder coupled to the source device. The receiving assembly comprising an oscillator that transmits an oscillator having a second phase, a coupler that couples the light signal with the oscillator signal, a detector and difference amplifier that detect and determine the difference between the first phase and second phase and a processor that receives the difference between the phases and provides the difference to an encoder so that the encoder can adjust the oscillator phase.

4. 发明授权

US09859985B2 Optical transmitter, optical transmission system and optical communication control method 有权
公开(公告)号：US09859985B2
公开(公告)日：2018-01-02
申请号：US15062816
申请日：2016-03-07
申请人： FUJITSU LIMITED
发明人： Yuichi Akiyama
IPC分类号： H04B10/04 , H04B10/12 , H04B10/556 , H04B10/516 , H04B10/532 , H04B10/50 , H04B10/00
CPC分类号： H04B10/5561 , H04B10/00 , H04B10/505 , H04B10/5055 , H04B10/50577 , H04B10/5161 , H04B10/532
摘要： An optical transmitter has an electrical signal generator configured to generate an electrical drive signal based upon input data; an optical modulator configured to modulate an input light by the electrical drive signal, the optical modulator having a first waveguide pair, a second waveguide pair, and a phase shifter that provides a phase difference between light waves travelling through the first waveguide pair and the second waveguide pair; and a controller configured to set the phase difference at the phase shifter to 0+n*π radians, where it is an integer, when a modulation scheme of the optical modulator is changed from a first scheme using four or more phase values to a second scheme using two phase values.

5. 发明申请

US20160282638A1 AUTOMATIC BIAS STABILIZATION OF DUAL-POLARIZATION IN-PHASE AND QUADRATURE OPTICAL MODULATOR 有权
标题翻译：双极化相位和自适应光学调制器的自动偏置稳定
公开(公告)号：US20160282638A1
公开(公告)日：2016-09-29
申请号：US15079859
申请日：2016-03-24
申请人： Finisar Corporation
发明人： Suhas P. Bhandare , Mark Colyar , David Meloche , Terence D. Grenda , Chris Stook , Heider N. Ereifej , John DeAndrea
IPC分类号： G02F1/01 , G02F1/225 , G01J4/00
CPC分类号： G02F1/0123 , G01J4/00 , G02F1/2257 , G02F2001/212 , H04B10/5053 , H04B10/50575 , H04B10/50577 , H04B10/532 , H04B10/548
摘要： Embodiments include a method and apparatus used for automatic bias stabilization of a DP IQM based on MZM for transmitting DP-QPSK optical data and/or DP-16 QAM optical data. The apparatus simultaneously dithers DC-bias voltages of in-phase child, quadrature-phase child, and parent MZMs with three different dither patterns in time-domain which are mutually orthogonal to each other in the frequency-domain for X and Y polarization IQ modulators. Tap monitor photodiodes detect an interference term between these three dither patterns for each polarization. The interference term is sampled using an ADC in the time domain. The time-synchronous detection method may solve a set of three simultaneous linear partial differential equations with three unknowns to compute controlled DC-bias voltages to set on the respective MZM with a solution set which may iteratively converge to a unique solution, thereby biasing the child MZM in dual-polarization IQM to transmission minimum and parent MZM in quadrature transmission.
摘要翻译：实施例包括用于基于用于发送DP-QPSK光学数据和/或DP-16QAM光学数据的MZM的DP IQM的自动偏置稳定的方法和装置。该装置同时在X和Y偏振IQ调制器的频域中抖动具有在时域中具有三个不同抖动模式的同相子，正交相位子载波和母MZMs的直流偏置电压彼此正交的频率。点击监视器光电二极管可以检测每个极化的这三个抖动图案之间的干涉项。在时域中使用ADC对干扰项进行采样。时间同步检测方法可以解决一组具有三个未知数的三个同时线性偏微分方程，以计算受控直流偏置电压，以使用可以迭代地收敛到唯一解的解集合在相应的MZM上设置，由此偏置子 MZM在双极化IQM中传输最小，母MZM在正交传输中。

6. 发明申请

US20160269123A1 OPTICAL TRANSMITTER, OPTICAL TRANSMISSION SYSTEM AND OPTICAL COMMUNICATION CONTROL METHOD 有权
标题翻译：光学发射机，光传输系统和光通信控制方法
公开(公告)号：US20160269123A1
公开(公告)日：2016-09-15
申请号：US15062816
申请日：2016-03-07
申请人： FUJITSU LIMITED
发明人： Yuichi AKIYAMA
IPC分类号： H04B10/556 , H04B10/516 , H04B10/532
CPC分类号： H04B10/5561 , H04B10/00 , H04B10/505 , H04B10/5055 , H04B10/50577 , H04B10/5161 , H04B10/532
摘要： An optical transmitter has an electrical signal generator configured to generate an electrical drive signal based upon input data; an optical modulator configured to modulate an input light by the electrical drive signal, the optical modulator having a first waveguide pair, a second waveguide pair, and a phase shifter that provides a phase difference between light waves travelling through the first waveguide pair and the second waveguide pair; and a controller configured to set the phase difference at the phase shifter to 0+n*π radians, where it is an integer, when a modulation scheme of the optical modulator is changed from a first scheme using four or more phase values to a second scheme using two phase values.
摘要翻译：光发射器具有电信号发生器，其被配置为基于输入数据产生电驱动信号; 配置为通过电驱动信号调制输入光的光调制器，所述光调制器具有第一波导对，第二波导对和移相器，所述第一波导对，第二波导对和移相器提供穿过第一波导对的光波与第二波导对之间的相位差波导对; 以及控制器，其被配置为当所述光调制器的调制方案从使用四个或更多个相位值的第一方案改变为第二方案时，将所述移相器处的相位差设置为0 + n *π弧度，其中它是整数方案使用两个相位值。

7. 发明授权

US09294200B2 Optimum modulator bias systems and methods in coherent optical transmitters 有权
公开(公告)号：US09294200B2
公开(公告)日：2016-03-22
申请号：US14711397
申请日：2015-05-13
申请人： Ciena Corporation
发明人： Gary Mak , Yves Beaulieu , Mohammad Sotoodeh
IPC分类号： H04B10/50 , H04B10/548 , H04B10/54 , H04B10/556 , G02F1/01 , G02F1/225 , H04B10/532
CPC分类号： H04B10/548 , G02F1/0123 , G02F1/2255 , H04B10/5055 , H04B10/50575 , H04B10/50577 , H04B10/532 , H04B10/541 , H04B10/5561
摘要： A modulator bias selection method, a coherent optical transmitter, and optical modulator solve the problem of generating a correct constellation using the bias points with the minimum phase adjustment range. The optimum modulator bias systems and methods include a coherent optical transmitter with control of four (XI, XQ, YI, YQ) quadrature data signals via a transmitter (Tx) application specific integrated circuit (ASIC), with a modulator bias controller which implements an algorithm to find the optimum bias points. The optimum bias points yield a correct constellation with minimum phase/bias adjustment. An algorithm is used to find the optimum bias solution using fast, simple method, adjusting only one quadrature at a time and exploiting a control feature of the Tx ASIC. This algorithm is significantly simpler than a generalized search, is a local algorithm, and uses only DC power measurement at the transmitter.

8. 发明授权

US09007675B2 Optical modulation device and optical modulation method 有权
标题翻译：光调制装置及光调制方式
公开(公告)号：US09007675B2
公开(公告)日：2015-04-14
申请号：US13663758
申请日：2012-10-30
申请人： Fujitsu Optical Components Limited
发明人： Akihiro Toya , Tsuyoshi Morishita
IPC分类号： G02F1/01 , H04B10/50 , H04B10/556
CPC分类号： G02F1/01 , G02F1/0123 , H04B10/50572 , H04B10/50575 , H04B10/50577 , H04B10/5561
摘要： In an optical modulation device, a first drive signal and a first bias signal are applied to a phase modulation unit, a second drive signal and a second bias signal are applied to a phase modulation unit, and a third bias signal is applied to a π/2 phase shift unit. A control unit adjusts the third bias signal in a first adjustment period, adjusts the first drive signal and the first bias signal in a second adjustment period next to the first adjustment period, and adjusts the second drive signal and the second bias signal in a third adjustment period next to the second adjustment period. The control unit starts the second adjustment period before a gap between the current value of an adjustment reference signal and a target value is filled, and starts the third adjustment period before a gap in the second adjustment period is filled.
摘要翻译：在光调制装置中，将第一驱动信号和第一偏置信号施加到相位调制单元，将第二驱动信号和第二偏置信号施加到相位调制单元，并将第三偏置信号施加到＆pgr ; / 2相移单元。控制单元在第一调整周期中调整第三偏置信号，在与第一调整周期相邻的第二调整周期中调整第一驱动信号和第一偏置信号，并且在第三调整周期中调整第二驱动信号和第二偏置信号调整期在第二个调整期之后。控制单元在填充调整基准信号的当前值和目标值之间的间隙之前开始第二调整周期，并且在第二调整周期中的间隙被填满之前开始第三调整周期。

9. 发明申请

US20130044366A1 METHOD AND APPARATUS FOR CONTROLLING BIAS POINT OF DIFFERENTIAL QUADRATURE PHASE SHIFT KEYING DEMODULATOR 有权
标题翻译：控制差分平移相位移相关调制解调器的方法和装置
公开(公告)号：US20130044366A1
公开(公告)日：2013-02-21
申请号：US13634469
申请日：2010-08-20
申请人： Jianhua Chen , Hong Yi
发明人： Jianhua Chen , Hong Yi
IPC分类号： G02F2/00
CPC分类号： H04B10/69 , H04B10/50575 , H04B10/50577 , H04B10/677
摘要： Method and apparatus for controlling bias point of DQPSK demodulator are disclosed. The method comprises: step 1: respectively applying first and second bias voltages to I-path and Q-path, and applying identical pilot voltage signals to I-path and Q-path (S202); step 2:executing filtering processing on I-path and Q-path differential current signals collected by balance receiver and determining θIand θQ (S204); step 3: performing feedback control to first and second bias voltages respectively according to θI and θQ so that θI and θQ respectively reaches expected bias point values of I-path and Q-path (S206); executing step 2 and 3 cyclically at preset regular intervals (S208), so that θI and θQ remains consistently the expected bias point values of I-path and Q-path. The solution enables bias point of DQPSK demodulator to be locked at any expected bias point value, facilitates realization of digitization, and is not easily influenced.
摘要翻译：公开了用于控制DQPSK解调器偏置点的方法和装置。该方法包括：步骤1：分别对I路径和Q路径施加第一和第二偏置电压，并向I路径和Q路径施加相同的导频电压信号（S202）; 步骤2：对平衡接收机收集的I路径和Q路径差分电流信号执行滤波处理和确定; Iand＆thetas; Q（S204）; 步骤3：分别根据I和I等级Q对第一和第二偏置电压进行反馈控制，使得I和I等于Q分别达到I路径和Q路径的预期偏置点值（S206）; 以预定的时间间隔循环执行步骤2和3（S208），使得I和＆amp; t; Q保持一致地是I-path和Q-path的预期偏置点值。该解决方案使DQPSK解调器的偏置点能够被锁定在任何预期的偏置点值，便于数字化的实现，并且不容易受到影响。

10. 发明申请

US20120087617A1 OPTICAL MODULATOR AND OPTICAL MODULATING METHOD 失效
标题翻译：光学调制器和光学调制方法
公开(公告)号：US20120087617A1
公开(公告)日：2012-04-12
申请号：US13192601
申请日：2011-07-28
申请人： Tsuyoshi MORISHITA
发明人： Tsuyoshi MORISHITA
IPC分类号： G02F1/035
CPC分类号： G02F1/0121 , G02F1/2255 , G02F2203/50 , H04B10/5053 , H04B10/50575 , H04B10/50577 , H04B10/5561
摘要： An optical modulator includes a modulator that modulates an input light of light by using an input signal. The optical modulator further includes a compensation circuit that compensates the phase of a signal light in accordance with an input current, the signal light being the input light modulated by the modulator. The optical modulator further includes a detector that detects the difference between the phase of the signal light compensated by the compensation circuit and the phase of an input signal that is input to the modulator. The optical modulator further includes an adjustment circuit that adjusts, in accordance with the phase difference detected by the detector, the input current that is input to the compensation circuit.
摘要翻译：光调制器包括通过使用输入信号来调制光的输入光的调制器。光调制器还包括补偿电路，该补偿电路根据输入电流来补偿信号光的相位，信号光是由调制器调制的输入光。光调制器还包括检测器，其检测由补偿电路补偿的信号光的相位与输入到调制器的输入信号的相位之间的差异。光调制器还包括调整电路，其根据由检测器检测的相位差调整输入到补偿电路的输入电流。

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