Low noise transistor module and amplifier
    1.
    发明授权
    Low noise transistor module and amplifier 失效
    低噪声晶体管模块和放大器

    公开(公告)号:US5977830A

    公开(公告)日:1999-11-02

    申请号:US974816

    申请日:1997-11-20

    摘要: A low noise transistor IC or module comprises a plurality of conventional CMOS transistors which are laid out in parallel in such a way that the effective gate width of the combination of transistors is increased, yet the effective gate resistance and hence the noise figure (NF) of the circuit are reduced. A low noise amplifier incorporating such a module is also described.

    摘要翻译: 低噪声晶体管IC或模块包括多个常规CMOS晶体管,它们并联布置,使得晶体管组合的有效栅极宽度增加,但是有效栅极电阻,因此噪声系数(NF) 的电路减少。 还描述了并入这种模块的低噪声放大器。

    Photonic match filter
    3.
    发明授权
    Photonic match filter 有权
    光子匹配滤波器

    公开(公告)号:US08238017B2

    公开(公告)日:2012-08-07

    申请号:US12641601

    申请日:2009-12-18

    IPC分类号: G02F1/01

    摘要: An optical path is configured to propagate an input optical signal. A plurality of electrodes are configured to produce a plurality of discrete phase shifts on the optical signal. An output optical signal is phase-shifted with respect to the input optical signal by a sum of the plurality of discrete phase shifts.

    摘要翻译: 光路被配置为传播输入光信号。 多个电极被配置为在光信号上产生多个离散相移。 输出光信号相对于输入光信号通过多个离散相移的和进行相移。

    Multiple-Input Method And Apparatus Of Free-Space Optical Communication
    5.
    发明申请
    Multiple-Input Method And Apparatus Of Free-Space Optical Communication 有权
    自由空间光通信的多输入法和装置

    公开(公告)号:US20120008961A1

    公开(公告)日:2012-01-12

    申请号:US12915506

    申请日:2010-10-29

    IPC分类号: H04B10/00

    CPC分类号: H04B10/1121 H04B10/613

    摘要: An approach is provided that uses diversity to compensate fading of free-space optical (FSO) signals propagating through an environment characterized by atmospheric scintillation. One embodiment involves collecting at least one FSO beam, demultiplexing the beam by wavelength into at least two sub-beams, detecting each sub-beam to produce an electrical output therefrom, and recovering a signal using complementary information from at least two of the electrical outputs. Another embodiment involves collecting the FSO beam onto an array of spatially separated sub-apertures, detecting the light entering each sub-aperture to produce an electrical output therefrom, and recovering a signal using complementary information from at least two of the electrical outputs. This second embodiment enables both electronic adaptive processing to coherently integrate across the sub-apertures and in the case of multiple transmit apertures a free space optical Multiple Input Multiple Output (MIMO) system.

    摘要翻译: 提供了一种使用分集来补偿通过大气闪烁特征的环境传播的自由空间光(FSO)信号的衰落的方法。 一个实施例涉及收集至少一个FSO波束,通过波长将光束解复用为至少两个子波束,检测每个子波束以产生电输出,以及使用来自至少两个电输出的补充信息来恢复信号 。 另一个实施例涉及将FSO光束收集到空间上分离的子孔径阵列上,检测进入每个子孔径的光以产生其电输出,以及使用来自至少两个电输出的补充信息来恢复信号。 该第二实施例使得电子自适应处理能够在子孔径之间相干地集成,并且在多个发射孔径的情况下使得自由空间光学多输入多输出(MIMO)系统。

    Frequency estimation in an intradyne optical receiver
    6.
    发明授权
    Frequency estimation in an intradyne optical receiver 有权
    intradyne光接收机中的频率估计

    公开(公告)号:US08073345B2

    公开(公告)日:2011-12-06

    申请号:US11644536

    申请日:2006-12-22

    IPC分类号: H04B10/06

    摘要: A method for determining symbols PSK modulated on an optical carrier includes interfering a first polarization component of the modulated optical carrier and a reference optical carrier in a first optical mixer and interfering the first polarization component of the modulated optical carrier and the reference with a different relative phase in a second optical mixer. The method also includes sampling the interfered carriers from the first optical mixer to produce first digital sampled values and sampling the interfered carriers from the second optical mixer to produce second digital sampled values. The first and second digital sampled values of a sampling period form a first complex sampling value thereof. The method also includes offsetting a phase of a complex signal value corresponding to each first complex sampling value to correct for a phase error caused by a frequency offset between the modulated and reference optical carriers.

    摘要翻译: 一种用于确定在光载波上调制的符号PSK的方法包括:在第一光混合器中干扰调制光载波的第一偏振分量和参考光载波,并将调制的光载波的第一偏振分量与参考用不同的相对 在第二光学混合器中。 该方法还包括对来自第一光混合器的受干扰载波进行采样,以产生第一数字采样值,并对来自第二光混合器的干扰载波进行采样以产生第二数字采样值。 采样周期的第一和第二数字采样值形成其第一复数采样值。 该方法还包括抵消对应于每个第一复数采样值的复信号值的相位,以校正由调制参考光载波之间的频率偏移引起的相位误差。

    Technique for photonic analog-to-digital signal conversion
    7.
    发明授权
    Technique for photonic analog-to-digital signal conversion 有权
    光子模拟 - 数字信号转换技术

    公开(公告)号:US07956788B2

    公开(公告)日:2011-06-07

    申请号:US12387301

    申请日:2009-04-30

    IPC分类号: H03M1/12

    CPC分类号: H03M1/1215 G02F7/00

    摘要: In an inventive photonic analog-to-digital signal converter (ADC), multiple opto-electric sampling devices are employed to successively sample an analog signal input. Optical clock signals having the same frequency but different clock phases are used, which are associated with the opto-electric sampling devices, respectively. Each sampling device takes samples of the analog signal input in response to the optical clock signal associated therewith. The resulting samples are processed to produce quantized samples. The inventive ADC outputs a digital signal representing the quantized samples.

    摘要翻译: 在本发明的光子模拟 - 数字信号转换器(ADC)中,采用多个光电采样装置来连续采样模拟信号输入。 使用具有相同频率但不同时钟相位的光时钟信号,它们分别与光电采样装置相关联。 每个采样装置响应于与其相关联的光时钟信号来采样模拟信号输入。 处理所得样品以产生量化样品。 本发明的ADC输出表示量化样本的数字信号。

    CMOS-COMPATIBLE TUNABLE MICROWAVE PHOTONIC BAND-STOP FILTER
    9.
    发明申请
    CMOS-COMPATIBLE TUNABLE MICROWAVE PHOTONIC BAND-STOP FILTER 有权
    CMOS兼容微波微波贴片过滤器

    公开(公告)号:US20090214223A1

    公开(公告)日:2009-08-27

    申请号:US12035677

    申请日:2008-02-22

    IPC分类号: H04B10/04

    CPC分类号: H04B10/00 H04B2210/006

    摘要: According to one embodiment, a microwave photonic band-stop (MPBS) filter uses an electrical input signal to drive an optical Mach-Zehnder modulator. A modulated optical carrier produced by the modulator is applied to an optical filter having at least two tunable spectral attenuation bands that are located substantially symmetrically on either side of the carrier frequency. The resulting filtered optical signal is applied to an optical-to-electrical (O/E) converter to produce an electrical output signal.

    摘要翻译: 根据一个实施例,微波光子带阻(MPBS)滤波器使用电输入信号来驱动光学马赫 - 曾德尔调制器。 由调制器产生的调制光载波被应用于具有至少两个可调频谱衰减频带的滤光器,该衰减频带基本对称地位于载波频率的任一侧上。 所得到的经滤波的光信号被施加到光电(O / E)转换器以产生电输出信号。

    Programmable optical array
    10.
    发明授权
    Programmable optical array 有权
    可编程光学阵列

    公开(公告)号:US07548668B2

    公开(公告)日:2009-06-16

    申请号:US11944183

    申请日:2007-11-21

    IPC分类号: G02B6/12 G02B6/35

    摘要: An apparatus having a topology that allows building complicated optical programmable arrays useful for manipulating the phase and/or amplitude of an optical signal. Sophisticated filtering and other optical signal processing functionality can be programmed into the array after a chip containing the array has been fabricated. This programming capability is analogous to that of electronic field programmable gate arrays (FPGA's). Apparatus described herein will provide a powerful tool for processing optical signals or very broadband electrical signals.

    摘要翻译: 具有拓扑结构的装置,其允许构建用于操纵光信号的相位和/或幅度的复杂的光学可编程阵列。 在制造了包含阵列的芯片之后,可以将复杂的滤波和其他光信号处理功能编程到阵列中。 这种编程能力类似于电子现场可编程门阵列(FPGA)的编程能力。 本文描述的装置将提供用于处理光信号或非常宽带电信号的强大工具。