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1. 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。

2. 发明申请

US20130256514A1 MULTI-MODE OPTOELECTRONIC OSCILLATOR 有权
标题翻译：多模光电振荡器
公开(公告)号：US20130256514A1
公开(公告)日：2013-10-03
申请号：US13617144
申请日：2012-09-14
申请人： Preetpaul S. Devgan , Vincent J. Urick , Keith J. Williams
发明人： Preetpaul S. Devgan , Vincent J. Urick , Keith J. Williams
IPC分类号： G02F1/01
CPC分类号： G02F1/0102 , H03B17/00 , H03C7/00 , H04B2210/006
摘要： A multi-mode optoelectronic oscillator (MM-OEO) includes an OEO cavity having an input for receiving an RF signal and an RF output. The OEO cavity includes a) a first laser having a first laser output, a second laser having a second laser output, b) a modulator having i) a first input coupled to the first laser output, ii) a second input coupled to the second laser output, iii) a third input, iv) a first modulator output ,and v) a second modulator output, c) a semiconductor optical amplifier (SOA) having an input coupled to the first modulator output and having an SOA amplified output, d) a photodetector coupled to the SOA amplified output and having an output, and e) a coupler having an input coupled to the photodetector output and having a first output coupled to the third modulator input and a second output, whereby an amplified RF signal is produced at the OEO RF output.
摘要翻译：多模光电子振荡器（MM-OEO）包括具有用于接收RF信号和RF输出的输入的OEO腔。 OEO腔包括a）具有第一激光输出的第一激光器，具有第二激光输出的第二激光器，b）调制器，其具有i）耦合到第一激光输出的第一输入，ii）耦合到第二激光输出的第二输入激光输出，iii）第三输入，iv）第一调制器输出，以及v）第二调制器输出，c）具有耦合到第一调制器输出并具有SOA放大输出的输入的半导体光放大器（SOA），d ）耦合到所述SOA放大的输出并具有输出的光电检测器，以及e）具有耦合到所述光电检测器输出并具有耦合到所述第三调制器输入的第一输出和第二输出的输入的耦合器，由此产生放大的RF信号在OEO RF输出。

3. 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.

4. 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。

5. 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。

6. 发明授权

US06384948B1 High-sensitivity, high-speed digital optical photoreceiver 失效
标题翻译：高灵敏度，高速数字光接收器
公开(公告)号：US06384948B1
公开(公告)日：2002-05-07
申请号：US09163397
申请日：1998-09-30
申请人： Keith J. Williams , Ronald D. Esman , Carl A. Villarruel , Michael L. Dennis , Irl N. Duling, III
发明人： Keith J. Williams , Ronald D. Esman , Carl A. Villarruel , Michael L. Dennis , Irl N. Duling, III
IPC分类号： H01S300
CPC分类号： H04B10/675 , H01S3/06754 , H04B10/673
摘要： An optical receiver for receiving a signal from an optical fiber in a fiber-optic digital transmission system that includes a first low noise optical amplifier to amplify an input optical signal. The first low noise optical amplifier has an input 3 dB compression point lower than the desired system input sensitivity at a desired bit rate. A high power optical amplifier further amplifies the amplified optical signal, and has an automatic gain control for output signal leveling at a desired operation point of the transmission system. A high current photodetector converts the further amplified optical signal from the high power optical amplifier to an electrical signal that drives a retiming circuit without requiring further amplification of the electric signal.
摘要翻译：一种用于在光纤数字传输系统中从光纤接收信号的光接收机，其包括第一低噪声光放大器以放大输入光信号。第一个低噪声光放大器的输入3 dB压缩点低于所需系统输入灵敏度，以期望的比特率。高功率光放大器进一步放大放大的光信号，并且具有用于在传输系统的期望操作点处的输出信号调平的自动增益控制。高电流光电探测器将来自高功率光放大器的进一步放大的光信号转换成驱动定时电路的电信号，而不需要进一步放大电信号。

7. 发明授权

US06621619B2 Hybrid brillouin/erbium doped fiber amplifier apparatus and method 失效
标题翻译：混合布里渊/掺铒光纤放大器的装置及方法
公开(公告)号：US06621619B2
公开(公告)日：2003-09-16
申请号：US09916498
申请日：2001-07-30
申请人： Shane J. Strutz , Keith J. Williams
发明人： Shane J. Strutz , Keith J. Williams
IPC分类号： H01S3108
CPC分类号： H01S3/10007 , H01S3/06754 , H01S3/10053 , H01S3/1608 , H01S3/2383 , H01S3/302 , H01S2301/02
摘要： A method and apparatus to enable the use of low cost high RIN optical sources for microwave photonic links by combining the wide-gain bandwidth and low cost of an EDFA, with the narrow gain bandwidth of a Brillouin amplifier. The hybrid Brillouin/EDFA (“hybrid amplifier”) apparatus of the present invention includes at least two couplers, a phase modulator, an Erbium-doped fiber, a laser source to pump the Erbium fiber, an optical circulator, and a length of fiber used for Brillouin amplification. Optical signals from the laser source are split into two optical paths by a polarization maintaining coupler. Optical signals passing through a first path are amplified by the Erbium doped fiber, and the amplified signals are passed through the optical circulator before sending the optical signals into one end of a spool of fiber in order to pump the Brillouin acoustic wave. Optical signals that follow a second path are phase modulated in a phase modulator at the Brillouin frequency and injected into an opposite end of the fiber spool in order to seed the Brillouin amplifier and improve its low frequency stability. The output of the Brillouin section of the hybrid amplifier is directed through the optical circulator, and the output may be used as an optical source for a photonic link.
摘要翻译：通过将EDFA的宽增益带宽和低成本与布里渊放大器的窄增益带宽相结合，能够将低成本高RIN光源用于微波光子链路的方法和装置。本发明的混合布里渊/ EDFA（“混合放大器”）装置包括至少两个耦合器，相位调制器，掺铒光纤，泵浦铒光纤的激光源，光循环器和一段光纤用于布里渊扩增。来自激光源的光信号被偏振保持耦合器分成两个光路。通过第一路径的光信号被掺铒光纤放大，并且在将光信号发送到光纤卷轴的一端之前，放大的信号通过光环行器，以便泵浦布里渊声波。遵循第二路径的光信号在布里渊频率的相位调制器中进行相位调制，并注入到光纤线轴的相对端，以使布里渊放大器接种，并提高其低频稳定性。混合放大器的布里渊部分的输出通过光环行器引导，并且该输出可以用作光子链路的光源。

8. 依法登记的发明

USH1791H Stimulated Brillouin scattering for fiber-optic links 失效
标题翻译：光纤链路的受激布里渊散射
公开(公告)号：USH1791H
公开(公告)日：1999-03-02
申请号：US741005
申请日：1996-10-31
申请人： Keith J. Williams
发明人： Keith J. Williams
IPC分类号： H04B10/18 , G02B6/00
CPC分类号： H04B10/2537
摘要： An attenuator/filter is disclosed that is inherently tuned and provides for a stimulated Brillouin scattering effect having a predetermined threshold that fixes the output thereof at a predefined power level. The stimulated Brillouin scattering effect is disclosed as being provided by either a fused silica optical fiber or a fiber-optic ring resonator both of which act as a filter to allow selected frequencies to pass. The SBS threshold is selected to improve the sideband to carrier power ratio which, in turn, determines the modulation depth for the modulated signal.
摘要翻译：公开了衰减器/滤波器，该衰减器/滤波器被固有地调谐并提供具有预定阈值的受激布里渊散射效应，该预定阈值将其输出固定在预定功率水平。公开的受激布里渊散射效应由熔融石英光纤或光纤环谐振器提供，两者都用作滤波器以允许选定的频率通过。选择SBS阈值以改善边带与载波功率比，其又决定了调制信号的调制深度。

9. 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。

10. 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。

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