专利快速检索-快速检索全球专利，免费商用专利数据库-IPRDB

1. 发明授权

US09172471B2 System and method for suppression of even-order photodiode distortions 有权
标题翻译：用于抑制偶次光电二极管畸变的系统和方法
公开(公告)号：US09172471B2
公开(公告)日：2015-10-27
申请号：US14045618
申请日：2013-10-03
申请人： Meredith N. Hutchinson , Joseph M. Singley , Vincent J Urick , Jason D. McKinney , Keith J Williams
发明人： Meredith N. Hutchinson , Joseph M. Singley , Vincent J Urick , Jason D. McKinney , Keith J Williams
IPC分类号： H04B10/04 , H04B10/548 , H04B10/532 , H04B10/2507 , H04B10/2575
CPC分类号： H04B10/548 , H04B10/2507 , H04B10/2575 , H04B10/532 , H04B2210/254
摘要： A system for suppressing even-order distortion in a photonic link includes a laser for providing laser light to a first input of a Mach-Zehnder modulator (MZM), where the MZM has a second input for receiving an RF input signal, a third input for applying a DC bias voltage to the MZM, and an optical signal output. A dc-voltage-biased photodiode has an input, coupled to the MZM optical signal output, and a modulated RF signal output. The MZM DC bias voltage is set at a value to generate an even-order distortion amplitude substantially equal to an even-order distortion amplitude from the photodiode and 180 degrees out of phase so as to substantially cancel the photodiode even-order distortion. The invention provides the cancellation of photodiode even-order distortion via predisortion linearization with a MZM biased slightly away from quadrature, employing a single fiber run and a single photodiode. The invention provides an improvement in carrier-to-intermodulation ratio (CIR) upwards of 40 dB.
摘要翻译：用于抑制光子链路中的偶数阶失真的系统包括用于向Mach-Zehnder调制器（MZM）的第一输入提供激光的激光器，其中MZM具有用于接收RF输入信号的第二输入，第三输入用于向MZM施加直流偏置电压，以及光信号输出。直流偏置电压的光电二极管具有耦合到MZM光信号输出的输入和调制的RF信号输出。 MZM直流偏置电压被设定为一个值，以产生基本上等于来自光电二极管的偶次失真振幅和180度异相的偶数失真幅度，以便基本上消除光电二极管的偶次失真。本发明通过使用单个光纤运行和单个光电二极管偏离稍微远离正交的MZM的预失真线性化来提供光电二极管偶数失真的消除。本发明提供了在40dB以上的载波与互调比（CIR）的改进。

2. 发明申请

US20100266289A1 Even-Order Harmonic Cancellation and Increased RF Gain Using Dual-Output Mach-Zehnder Modulator with Two Wavelength Input 有权
标题翻译：使用具有两个波长输入的双输出马赫 - 曾德调制器进行偶次谐波消除和增加的RF增益
公开(公告)号：US20100266289A1
公开(公告)日：2010-10-21
申请号：US12688062
申请日：2010-01-15
申请人： Preetpaul S. Devgan , Vincent J. Urick , Keith J. Williams , John F. Diehl , Christopher E. Sunderman
发明人： Preetpaul S. Devgan , Vincent J. Urick , Keith J. Williams , John F. Diehl , Christopher E. Sunderman
IPC分类号： H04B10/12 , H04B10/06 , H04B10/00
CPC分类号： H04B1/18 , H04B2001/0491 , H04B2210/006
摘要： A method and system for processing analog optical signals to produce a single RF output free from even-order harmonic distortion. Two analog optical signals of different wavelengths λ1, λ2 are input into a dual-output Mach-Zehnder modulator (MZM), where one wavelength input is high-biased and one wavelength is low-biased. The complementary high- and low-biased wavelengths are output from each arm of the MZM to a multiplexer, which filters out the unwanted high- or low-biased wavelengths from each MZM arm so that both wavelengths are low-biased or high-biased. The signals are passed to a pair of photodiodes, and the photocurrents from the photodiodes are differenced to produce the final RF output. Because of the complementary phase differences between the two low- or high-biased signals generating the photocurrent, all components of the photocurrent except the fundamental and odd-order harmonics cancel each other, resulting in a high-quality RF output free from harmonic distortion.
摘要翻译：一种用于处理模拟光信号以产生没有偶次谐波失真的单个RF输出的方法和系统。两个不同波长的模拟光信号λ1，λ2输入到双输出马赫 - 曾德调制器（MZM）中，其中一个波长输入为高偏置，一个波长为低偏置。互补的高和低偏置波长从MZM的每个臂输出到多路复用器，其从每个MZM臂滤除不需要的高或低偏置波长，使得两个波长都是低偏置或高偏置的。信号被传递到一对光电二极管，来自光电二极管的光电流被差分以产生最终的RF输出。由于产生光电流的两个低或高偏置信号之间的互补相位差，除了基波和奇次谐波之外的光电流的所有分量彼此抵消，导致高质量的RF输出没有谐波失真。

3. 发明授权

US06731922B1 Optical image reject down converter 失效
标题翻译：光学图像拒绝转换器
公开(公告)号：US06731922B1
公开(公告)日：2004-05-04
申请号：US09662839
申请日：2000-09-15
申请人： Shane J. Strutz , Keith J. Williams
发明人： Shane J. Strutz , Keith J. Williams
IPC分类号： H04B110
CPC分类号： H04B10/61
摘要： The remotable, ultrawide band optical image rejection downconverter uses sub-carrier modulation techniques without concern for image frequency interferences in the shifted signal, thereby allowing telecommunications systems to downconvert densely multiplexed communications channels into a low frequency band where conventional electronics can perform signal-processing functions. This invention has the image rejection (>120 dB) to provide unambiguous signals for direction finding applications and exhibits an efficient image that permits multi-octave microwave frequency reception and compression. This invention is intrinsically remoteable, and due to the various optical and electrical components proves to be very useful and practical in numerous fiber optic and antenna systems.
摘要翻译：远摄超宽带光学图像抑制下变频器使用副载波调制技术，而不考虑移位信号中的图像频率干扰，从而允许电信系统将密集复用的通信信道下转换成低频带，其中常规电子设备可以执行信号处理功能。本发明具有镜像抑制（> 120dB）以提供用于方向发现应用的明确信号，并且展现了允许多倍频程微波频率接收和压缩的有效图像。本发明是本质上可遥控的，并且由于各种光学和电气部件被证明在许多光纤和天线系统中是非常有用和实用的。

4. 发明授权

US06476957B1 Image rejecting microwave photonic downconverter 失效
标题翻译：图像拒绝微波光子下变频器
公开(公告)号：US06476957B1
公开(公告)日：2002-11-05
申请号：US09620324
申请日：2000-07-17
申请人： Allan Ward , Keith J. Williams , Paul D. Biernacki , Lee T. Nichols
发明人： Allan Ward , Keith J. Williams , Paul D. Biernacki , Lee T. Nichols
IPC分类号： G02F135
CPC分类号： H03D9/00
摘要： An image rejecting microwave photonic downconverter uses a microwave sub-carrier modulation technique without concern for image frequency interference in the shifted signal, thereby allowing telecommunications systems to downconvert densely multiplexed communications channels into a low frequency band where conventionqal electronics can perform signal-processing functions. The image rejecting microwave photonic downconveter incoming microwave signals can be processed without ambiguity in direction finding applications, allowing remotable, multioctave microwave signal processing for frequency and phase determination. A first laser providing an optical carrier that is modulated by a first electro-optic modulator with a sinusoidal electrical signal generated by a first local oscillator and a second laser providing optical carrier that is modulated by a second electro-optic modulator with a sinusoidal electrical signal generated by the second local oscillator for a signal generated by a second local oscillator; are transmitted independently through two polarization-maintaining (PM) optical fibers of arbitrary length to a distant point. There the first modulated optical signal is converted to an electrical domain and mixed with an input from an ultra-broadband radio frequency (RF) antenna receive-array, shifting the entire RF band to a higher frequency band equal to the original RF signal plus the modulated optical frequency signal.
摘要翻译：图像拒绝微波光子下变频器使用微波子载波调制技术，而不考虑移位信号中的图像频率干扰，从而允许电信系统将密集复用的通信信道下转换成低频带，其中常规电子设备可以执行信号处理功能。输入微波信号的图像抑制微波光子下行信号可以在寻找应用中无歧义地进行处理，从而允许用于频率和相位确定的远程，多功能微波信号处理。提供由第一电光调制器调制的第一激光器，其具有由第一本地振荡器产生的正弦电信号，以及提供由第二电光调制器调制的具有正弦电信号的第二激光器提供光载波由第二本机振荡器产生的用于由第二本地振荡器产生的信号; 通过任意长度的两个偏振保持（PM）光纤独立地传输到远端。在那里，第一调制光信号被转换成电域并与来自超宽带射频（RF）天线接收阵列的输入混合，将整个RF频带移动到等于原始RF信号的较高频带，加上调制光频信号。

5. 发明授权

US6043926A Electro-optical broadband microwave frequency shifter 失效
标题翻译：电光宽带微波移频器
公开(公告)号：US6043926A
公开(公告)日：2000-03-28
申请号：US827518
申请日：1997-03-28
申请人： Keith J. Williams
发明人： Keith J. Williams
IPC分类号： H03D9/00 , G02F1/35 , H01P1/00
CPC分类号： H03D9/00
摘要： The broadband microwave frequency shifter is an electro-optical device that accomplishes frequency shifting, or translation by the use of serrodyning or mixing techniques. A first optical signal is modulated with the radio frequency signal desired to be translated and processed to produce an upconverted lower sideband optical signal. A second optical signal is frequency shifted using an optical phase shifter utilizing serrodyning techniques or by offset phase locking it to another optical signal. When the frequency shifted optical signal is combined with the upconverted optical signal and converted to an output radio frequency signal thereby producing an output microwave signal that duplicates the input microwave signal in all aspects except that its center frequency has been shifted.
摘要翻译：宽带微波移频器是通过使用伺服或混合技术实现频移或平移的电光装置。用期望转换和处理的射频信号调制第一光信号以产生上变频的下边带光信号。第二光信号使用光学移相器利用静音技术或通过偏移相位锁定到另一光信号进行频移。当频移光信号与上转换的光信号组合并转换成输出射频信号，从而在除了其中心频率已经移位之外的所有方面产生复制输入微波信号的输出微波信号。

6. 依法登记的发明

USH1702H Wideband fiber-optic signal processor 失效
标题翻译：宽带光纤信号处理器
公开(公告)号：USH1702H
公开(公告)日：1998-01-06
申请号：US369437
申请日：1995-01-06
申请人： Ronald D. Esman , Lew Goldberg , Edward Alexander , Keith J. Williams
发明人： Ronald D. Esman , Lew Goldberg , Edward Alexander , Keith J. Williams
IPC分类号： H04B10/155 , H04B10/02 , H04B10/04 , H04B10/06
CPC分类号： H04B10/564 , H04B10/505
摘要： In the transmission electrical signals using an optical carrier the signal power carried by an optical carrier is proportional to the optical power. High optical power levels are desired for optical carriers that are modulated by weak electrical signals, however, significant unmodulated power is left in the original carrier after processing. To maximize the radio frequency (RF) signal power generated by a given (maximized) photodetector current (for a given input power), in this invention, the optical carrier power is reduced. This is accomplished by the addition of a narrowband optical filter, such as a Fabry-Perot filter, to reduce the average optical carrier power without reducing the modulation sidebands, which results in an increased modulation depth. Therefore, greater RF and microwave power is generated by a photodetector with the same photocurrent. With a laser source exhibiting a beam whose linewidth is narrow compared to the filter bandwidth, the filter is tuned, or frequency locked, to match the filtering resonance with the optical carrier wavelength. With the high finesse filter and narrow-linewidth laser beam, the frequency range of operation is extended from the filter half-bandwidth to the next resonance of the filter. Thus, broadband effective gain results without introducing additional noise.
摘要翻译：在使用光载波的传输电信号中，由光载波承载的信号功率与光功率成正比。对于由弱电信号调制的光载波，需要高的光功率电平，然而，处理后原始载波中仍然存在明显的未调制功率。为了最大化给定（最大化）光电检测器电流（对于给定输入功率）产生的射频（RF）信号功率，在本发明中，光载波功率降低。这通过添加诸如法布里 - 珀罗滤波器之类的窄带滤光器来实现，以减少平均光载波功率而不减少调制边带，这导致增加的调制深度。因此，具有相同光电流的光电检测器产生更大的RF和微波功率。使用具有与滤波器带宽相比线宽窄的波束的激光源，滤波器被调谐或频率锁定以使滤波谐振与光载波波长匹配。利用高精度滤波器和窄线宽激光束，操作的频率范围从滤波器半带宽扩展到滤波器的下一个谐振。因此，宽带有效增益不会引入额外的噪声。

7. 发明授权

US08224188B2 Even-order harmonic cancellation and increased RF gain using dual-output mach-zehnder modulator with two wavelength input 有权
标题翻译：使用具有两个波长输入的双输出马赫 - 泽德调制器进行偶次谐波消除和增加的RF增益
公开(公告)号：US08224188B2
公开(公告)日：2012-07-17
申请号：US12688062
申请日：2010-01-15
申请人： Preetpaul S Devgan , Vincent J Urick , Keith J Williams , John F. Diehl , Christopher E. Sunderman
发明人： Preetpaul S Devgan , Vincent J Urick , Keith J Williams , John F. Diehl , Christopher E. Sunderman
IPC分类号： H04B10/00
CPC分类号： H04B1/18 , H04B2001/0491 , H04B2210/006
摘要： A method and system for processing analog optical signals to produce a single RF output free from even-order harmonic distortion. Two analog optical signals of different wavelengths λ1, λ2 are input into a dual-output Mach-Zehnder modulator (MZM), where one wavelength input is high-biased and one wavelength is low-biased. The complementary high- and low-biased wavelengths are output from each arm of the MZM to a multiplexer, which filters out the unwanted high- or low-biased wavelengths from each MZM arm so that both wavelengths are low-biased or high-biased. The signals are passed to a pair of photodiodes, and the photocurrents from the photodiodes are differenced to produce the final RF output. Because of the complementary phase differences between the two low- or high-biased signals generating the photocurrent, all components of the photocurrent except the fundamental and odd-order harmonics cancel each other, resulting in a high-quality RF output free from harmonic distortion.
摘要翻译：一种用于处理模拟光信号以产生没有偶次谐波失真的单个RF输出的方法和系统。两个不同波长的模拟光信号λ1，λ2输入到双输出马赫 - 曾德调制器（MZM）中，其中一个波长输入为高偏置，一个波长为低偏置。互补的高和低偏置波长从MZM的每个臂输出到多路复用器，其从每个MZM臂滤除不需要的高或低偏置波长，使得两个波长都是低偏置或高偏置的。信号被传递到一对光电二极管，来自光电二极管的光电流被差分以产生最终的RF输出。由于产生光电流的两个低或高偏置信号之间的互补相位差，除了基波和奇次谐波之外的光电流的所有分量彼此抵消，导致高质量的RF输出没有谐波失真。

8. 发明授权

US06643417B2 All optical image reject down-converter 失效
公开(公告)号：US06643417B2
公开(公告)日：2003-11-04
申请号：US09810653
申请日：2001-03-16
申请人： Shane J. Strutz , Keith J. Williams
发明人： Shane J. Strutz , Keith J. Williams
IPC分类号： G02F200
CPC分类号： H04B10/60 , H03D9/00 , H04B10/64
摘要： An optical image reject down-converter for mapping a received radio frequency (RF) into an arbitrary intermediate frequency range and for precluding interference between the received signals. A received radio frequency signal is down-converted into an intermediate frequency band for use by an electronic circuit in other devices. Optical light is divided into a first path and a second path. Light in the first path is transferred into an optical sideband by a first optical modulator or phase modulator. Light in a second path is converted into sidebands by a second, non-cascaded optical modulator and then passed through a tunable narrow-band optical filter which selects the desired sideband. The optical spectrum of the second path then primarily includes light at the frequency equal to the original laser frequency plus the additional sidebands. The filtered sideband is heterodyned with the light from the first path, resulting in a down-conversion to the desired intermediate frequency. Image frequencies initially present in the optical link are thereby filtered and rejected.

9. 发明授权

US06766070B2 High power fiber optic modulator system and method 失效
标题翻译：大功率光纤调制器系统及方法
公开(公告)号：US06766070B2
公开(公告)日：2004-07-20
申请号：US09845111
申请日：2001-04-27
申请人： Keith J. Williams , Shane J. Strutz
发明人： Keith J. Williams , Shane J. Strutz
IPC分类号： G02F1035
CPC分类号： G02F1/225 , G02F1/0123 , G02F1/0134 , G02F1/0508 , G02F2203/50
摘要： An apparatus and method to increase the output power from LiNbO3 MZM style optical intensity modulating without exceeding the optical power damage threshold imposed by LiNbO3 is described. The optical path from a laser source is divided into two paths by a polarization maintaining (PM) coupler. The two paths form a Mach Zender Modulator (MZM) with a LiNbO3 phase modulator in one path and a fiber looped PZT in the other. The LiNbO3 phase modulator imprints an RF signal onto one path of the MZM cavity, while the fiber wrapped PZT is used to control the path length difference between the two optical paths. The two optical paths are recombined in a second PM coupler. The second PM coupler and a 1-2% coupler are used to sample a small portion of the MZM output signal which is fed back to a phase locked loop (PLL) circuit for providing feedback voltage to the fiber wrapped PZT in the second arm of the MZM, and ensures the phase of the signals in the two arms of the MZM are matched to within a fraction of the laser linewidth. The present invention increases the amount of optical power by using a LiNbO3 modulator within a fiber Mach-Zender cavity.
摘要翻译：描述了一种增加LiNbO3 MZM型光强度调制输出功率而不超过LiNbO3施加的光功率损伤阈值的装置和方法。来自激光源的光路由偏振维持（PM）耦合器分成两条路径。这两条路径形成了一个具有LiNbO3相位调制器的Mach Zender调制器（MZM），另一条路径是光纤环路PZT。 LiNbO3相位调制器将RF信号印记到MZM腔的一个路径上，而使用光纤缠绕的PZT来控制两个光路之间的路径长度差。两个光路在第二PM耦合器中重组。第二个PM耦合器和一个1-2％的耦合器用于对MZM输出信号的一小部分进行采样，该信号被反馈到锁相环（PLL）电路，用于向第二臂中的光纤缠绕PZT提供反馈电压 MZM，并且确保MZM的两个臂中的信号的相位匹配在激光线宽的一小部分内。本发明通过在纤维Mach-Zender腔内使用LiNbO 3调制器来增加光功率的量。

10. 发明授权

US06487004B1 Optical image reject down converter 失效
标题翻译：光学图像拒绝转换器
公开(公告)号：US06487004B1
公开(公告)日：2002-11-26
申请号：US09635985
申请日：2000-08-09
申请人： Shane J. Strutz , Keith J. Williams
发明人： Shane J. Strutz , Keith J. Williams
IPC分类号： G02F202
CPC分类号： H04B1/28 , G02F2/002 , H03D9/00 , H04B2210/006
摘要： The optical image reject down converter maps a received radio frequency (RF) into an arbitrary intermediate frequency range and precludes interference between the received signals. A received radio frequency signal is downconverted into an intermediate frequency band for use by an electronic circuit in other devices. Optical light is divided, in a first path light is transferred into an optical sideband by a first optical modulator or phase modulator. Light in a second path is converted into 18 GHz sidebands. The signal is amplified and additional sidebands are generated by a received 9 GHz signal. The filtered sideband is heterodyned with the 25 GHz signal of path one, resulting in downconversion to 2 GHZ. Image frequencies which are present in the optical link are filtered and are rejected.
摘要翻译：光学图像拒绝转换器将接收到的射频（RF）映射到任意的中间频率范围，并且排除接收到的信号之间的干扰。接收的射频信号被下变频成中频带，供其他装置中的电子电路使用。光束被分割，在第一路径中，光被第一光调制器或相位调制器传输到光边带。第二路中的光被转换成18GHz边带。信号被放大，并且附加的边带由接收的9GHz信号产生。经滤波的边带与路径1的25 GHz信号进行外差，导致下变频至2 GHZ。存在于光学链路中的图像频率被滤波并被拒绝。

你已经成功收藏专利！

检索式保存成功!

IPRDB

热门服务

关于我们

友情链接

联系方式