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    • 1. 发明授权
    • System and method for suppression of even-order photodiode distortions
    • 用于抑制偶次光电二极管畸变的系统和方法
    • US09172471B2
    • 2015-10-27
    • US14045618
    • 2013-10-03
    • Meredith N. HutchinsonJoseph M. SingleyVincent J UrickJason D. McKinneyKeith J Williams
    • Meredith N. HutchinsonJoseph M. SingleyVincent J UrickJason D. McKinneyKeith J Williams
    • H04B10/04H04B10/548H04B10/532H04B10/2507H04B10/2575
    • H04B10/548H04B10/2507H04B10/2575H04B10/532H04B2210/254
    • 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.
    • 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。
    • 4. 发明授权
    • Even-order harmonic cancellation and increased RF gain using dual-output mach-zehnder modulator with two wavelength input
    • 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
    • US08224188B2
    • 2012-07-17
    • US12688062
    • 2010-01-15
    • Preetpaul S DevganVincent J UrickKeith J WilliamsJohn F. DiehlChristopher E. Sunderman
    • Preetpaul S DevganVincent J UrickKeith J WilliamsJohn F. DiehlChristopher E. Sunderman
    • H04B10/00
    • H04B1/18H04B2001/0491H04B2210/006
    • 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.
    • 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。
    • 7. 发明授权
    • Multi-mode optoelectronic oscillator
    • 多模光电子振荡器
    • US08824901B2
    • 2014-09-02
    • US13617144
    • 2012-09-14
    • Preetpaul S DevganVincent J UrickKeith J Williams
    • Preetpaul S DevganVincent J UrickKeith J Williams
    • H03B17/00G02F1/01H03C7/00
    • G02F1/0102H03B17/00H03C7/00H04B2210/006
    • 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.
    • 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。
    • 8. 发明申请
    • MULTI-MODE OPTOELECTRONIC OSCILLATOR
    • 多模光电振荡器
    • US20130256514A1
    • 2013-10-03
    • US13617144
    • 2012-09-14
    • Preetpaul S. DevganVincent J. UrickKeith J. Williams
    • Preetpaul S. DevganVincent J. UrickKeith J. Williams
    • G02F1/01
    • G02F1/0102H03B17/00H03C7/00H04B2210/006
    • 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.
    • 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。