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    • 63. 发明申请
    • LIGHT MODULATOR,DEMODULATOR AND METHOD OF COMMUNICATION EMPLOYING THE SAME
    • 光调制器,解调器和通信方法
    • WO1982002960A1
    • 1982-09-02
    • PCT/US1982000179
    • 1982-02-16
    • FERGASON JAMES L
    • G02F01/13
    • H04B10/11G02F1/1393G02F2/00
    • A light modulator for generating a beam of phase modulated light including a source (10, 11) of polarized light (51), at least one and preferably two liquid crystal cells (12, 13) having a thin layer of nematic liquid crystals of positive dielectric anisotropy through which the polarized light is directed to produce a beam of light (14) having a phase shift corresponding to a modulating electrical signal which is applied to each of the liquid crystal cells. The liquid crystal cells in addition have a continuing electrical bias (29, 30) applied across the layers (26) in order to achieve the rapid response times necessary to achieve modulation of the polarized light. Demodulation of the polarized light occurs by splitting (15) the modulated light beam into its quadrature components (16, 17) and developing an electrical signal (22) corresponding to the phase difference between the two quadrature components. A communication system involving its modulators and demodulators delivers communication through light as a transmission medium.
    • 一种用于产生包括偏振光源(10,11)的相位调制光束的光调制器,至少一个并且优选两个具有正向的向列液晶薄层的液晶单元(12,13) 介电各向异性通过偏振光被引导以产生具有相应于施加到每个液晶单元的调制电信号的相移的光束(14)。 液晶单元还具有施加在层(26)上的持续电偏压(29,30),以实现实现偏振光调制所需的快速响应时间。 通过将调制的光束(15)分解成其正交分量(16,17)并且对应于两个正交分量之间的相位差开发电信号(22),发生偏振光的解调。 涉及其调制器和解调器的通信系统通过光作为传输介质提供通信。
    • 66. 发明公开
    • Method and apparatus of monitoring and tracking optical frequency differences of modulated beams
    • 用于调制光束的光频率的变化的监视和跟踪的方法和装置
    • EP2921822A1
    • 2015-09-23
    • EP15154767.6
    • 2015-02-11
    • Honeywell International Inc.
    • Qiu, TiequnHo, Waymon
    • G01C19/72
    • G01C19/722G01C19/72G01C19/727G01C21/00G02F2/00
    • A method of measuring beat frequency comprises modulating a first optical signal and a second optical signal, wherein the first modulated optical signal includes a first carrier frequency and a first plurality of sideband frequencies and the second modulated optical signal includes a second carrier frequency and a second plurality of sideband frequencies. The method also comprises combining a fraction of the first modulated optical signal with a fraction of the second modulated optical signal into a combined signal and determining a carrier beat frequency. The method further comprises selecting a frequency range from the combined signal; performing a fast Fourier transform (FFT) on an electrical signal representing the selected frequency range; tracking the carrier beat frequency based on the FFT; and outputting a rate signal based on the tracked carrier beat frequency, the rate signal indicating a rotation rate of the resonator fiber optic gyroscope.
    • 测量拍频的方法,包括调节第一光信号和第二光信号,worin所述第一调制光信号包括第一载波频率和边带频率的第一多个和所述第二调制光信号包括第二载波频率和第二 边带频率的多个。 因此,该方法包括与所述第二调制光信号的一小部分所述第一调制光信号的一小部分组合成组合信号和确定性采矿的载波差拍频率。 该方法还包括选择从组合信号的频率范围; 执行快速傅里叶变换(FFT)到表示所选择的频率范围的电信号; 跟踪基于所述FFT的载波差拍频率; 和输出婷基于所述跟踪的载波差拍频率的速率信号,速率信号指示所述谐振器的光纤陀螺仪的旋转速度。
    • 67. 发明公开
    • MODULATED SIGNAL DETECTING APPARATUS AND MODULATED SIGNAL DETECTING METHOD
    • 装置:用于检测调制信号检测调制信号和方法
    • EP2752850A1
    • 2014-07-09
    • EP12823184.2
    • 2012-08-16
    • Panasonic Corporation
    • ITO, KiyotakaHINO, Yasumori
    • G11B7/005G11B7/135
    • G02F2/00G11B7/1365G11B7/1395G11B20/10268H04B10/6165H04L27/223H04L27/2271
    • A phase difference error detecting unit (8) detects a phase difference error component included in a phase difference component; a phase difference correcting unit (3) corrects a first signal having the phase difference component as an angle of a cosine function and a second signal whose angle of the cosine function differs from that of the first signal by approximately π/2 based on the detected phase difference error component; a phase operating unit (6) operates a phase difference component from the first signal and the second signal corrected by the phase difference correcting unit (3); and the phase difference correcting unit (6) obtains the corrected first signal and the corrected second signal by rotating a coordinate point represented by the first signal and the second signal on a polar coordinate plane by an angle corresponding to the phase difference error component.
    • 相位差误差检测单元(8)检测包括在相位差成分的相位差的误差分量; 相位差校正部(3)来校正具有该相位差元件作为余弦函数的角度和第二信号,其余弦函数的角度不同于通过将约基于检测到的A / 2所做的第一信号的第一信号 相位差误差分量; 相位操作单元(6)进行操作,从所述第一信号的相位差成分和由相位差校正单元(3)校正后的第二信号; 和相位差校正单元(6)获得校正后的第一信号和通过旋转由所述第一信号和极性的第二信号所表示的坐标点在角对应于该相位差的误差分量由平面坐标校正的第二信号。
    • 70. 发明公开
    • Monitoring and controlling radiation source stability
    • Überwachungund Steuerung derStabilitäteiner Strahlungsquelle。
    • EP0235920A1
    • 1987-09-09
    • EP87300692.8
    • 1987-01-27
    • BRITISH TELECOMMUNICATIONS public limited company
    • Cameron, Keith HendersonSmith, David William
    • H01S3/137G01J9/04G02F2/00
    • H01S5/0014G01J9/0246G01J9/04G02F2/00H01S3/1394H01S5/0687
    • A method and apparatus for monitoring and/or controlling the frequency of a beam of coherent radiation is described. The apparatus comprises a reference source (1) which is controlled to generate a reference radiation beam with a frequency which is repeatedly swept through a range of operating frequencies. This reference beam is combined with a beam of coherent radiation from a test source and the combined beams are fed to a photodiode (9). The output of the photodiode (9) can be displayed so that the upper and lower beat frequencies can be determined enabling the variation of the average of the upper and lower beat frequencies with time to be monitored. Alternatively, the average beat frequency can be fed back as a control signal to control the test beam source (8). In this latter case, the frequency of the test beam will be locked.
    • 描述了用于监视和/或控制相干辐射束的频率的方法和装置。 该装置包括参考源(1),该参考源被控制以产生具有频率在多个工作频率范围内被扫过的频率的参考辐射束。 该参考光束与来自测试源的相干辐射束组合,并且组合的光束被馈送到光电二极管(9)。 可以显示光电二极管(9)的输出,使得能够确定能够随时间监视上下拍频的平均值的变化的上和下拍频。 或者,可以将平均拍频作为控制信号反馈以控制测试光束源(8)。 在后一种情况下,测试光束的频率将被锁定。