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    • 32. 发明授权
    • Athermal DQPSK and/or DPSK demodulator
    • 高温DQPSK和/或DPSK解调器
    • US08792155B2
    • 2014-07-29
    • US13622656
    • 2012-09-19
    • Finisar Corporation
    • Huiping LiFan ChenXiaolin ChenFahua Lan
    • G02F2/00
    • H04B10/677
    • In some example embodiments, a demodulator may include an input polarization beam splitter (IPBS), input half waveplate (IHWP), cubical polarization beam splitter (CPBS), first reflector (R1), second reflector (R2), first quarter waveplate (QWP1), second quarter waveplate (QWP2), beam displacer (BD), output half waveplate (OHWP), and output polarization beam splitter (OPBS). The CPBS may be positioned to receive an output from IPBS. The IHWP may be positioned between IPBS and CPBS. The R1 may be positioned to receive and return a first output from CPBS. The QWP1 may be positioned between CPBS and R1. The R2 may be positioned to receive and return a second output from CPBS. The QWP2 may be positioned between CPBS and R2. The BD may be positioned to receive a third output from CPBS. The OPBS may be positioned to receive an output from BD. The OHWP may be positioned between BD and OPBS.
    • 在一些示例实施例中,解调器可以包括输入偏振分束器(IPBS),输入半波片(IHWP),立方偏振分束器(CPBS),第一反射器(R1),第二反射器(R2),第一四分之一波片(QWP1 ),第二四分之一波片(QWP2),光束置换器(BD),输出半波片(OHWP)和输出偏振分束器(OPBS)。 CPBS可以被定位成从IPBS接收输出。 IHWP可能位于IPBS和CPBS之间。 R1可以被定位成接收和返回CPBS的第一个输出。 QWP1可以位于CPBS和R1之间。 R2可以定位成从CPBS接收和返回第二个输出。 QWP2可能位于CPBS和R2之间。 BD可以被定位成从CPBS接收第三输出。 OPBS可以被定位成从BD接收输出。 OHWP可以位于BD和OPBS之间。
    • 34. 发明申请
    • DP-QPSK DEMODULATOR
    • US20140133012A1
    • 2014-05-15
    • US13740500
    • 2013-01-14
    • FINISAR CORPORATION
    • Huiping LIXiaolin CHENFan CHENFahua LAN
    • G02F2/00
    • H04B10/615H04L27/223
    • In an embodiment, a demodulator includes first, second, third, fourth and fifth beam displacers, a half waveplate, and a quarter waveplate. The second beam displacer is positioned to receive an output from the first beam displacer. The third beam displacer is positioned to receive an output from the second beam displacer. The half waveplate is positioned to receive an output from the third beam displacer. The fourth beam displacer is positioned to receive an output from the half waveplate. The fifth beam displacer is positioned to receive an output from the fourth beam displacer. The quarter waveplate is positioned between the fourth beam displacer and the fifth beam displacer.
    • 在一个实施例中,解调器包括第一,第二,第三,第四和第五光束置换器,半波片和四分之一波片。 第二光束置换器被定位成接收来自第一光束置换器的输出。 第三光束置换器定位成接收来自第二光束置换器的输出。 半波片被定位成接收来自第三光束置换器的输出。 第四光束置换器定位成接收来自半波片的输出。 第五光束置换器被定位成接收来自第四光束置换器的输出。 四分之一波片位于第四光束置换器和第五光束置换器之间。
    • 37. 发明申请
    • METHOD AND APPARATUS FOR CONTROLLING BIAS POINT OF DIFFERENTIAL QUADRATURE PHASE SHIFT KEYING DEMODULATOR
    • 控制差分平移相位移相关调制解调器的方法和装置
    • US20130044366A1
    • 2013-02-21
    • US13634469
    • 2010-08-20
    • Jianhua ChenHong Yi
    • Jianhua ChenHong Yi
    • G02F2/00
    • H04B10/69H04B10/50575H04B10/50577H04B10/677
    • Method and apparatus for controlling bias point of DQPSK demodulator are disclosed. The method comprises: step 1: respectively applying first and second bias voltages to I-path and Q-path, and applying identical pilot voltage signals to I-path and Q-path (S202); step 2:executing filtering processing on I-path and Q-path differential current signals collected by balance receiver and determining θIand θQ (S204); step 3: performing feedback control to first and second bias voltages respectively according to θI and θQ so that θI and θQ respectively reaches expected bias point values of I-path and Q-path (S206); executing step 2 and 3 cyclically at preset regular intervals (S208), so that θI and θQ remains consistently the expected bias point values of I-path and Q-path. The solution enables bias point of DQPSK demodulator to be locked at any expected bias point value, facilitates realization of digitization, and is not easily influenced.
    • 公开了用于控制DQPSK解调器偏置点的方法和装置。 该方法包括:步骤1:分别对I路径和Q路径施加第一和第二偏置电压,并向I路径和Q路径施加相同的导频电压信号(S202); 步骤2:对平衡接收机收集的I路径和Q路径差分电流信号执行滤波处理和确定; Iand&thetas; Q(S204); 步骤3:分别根据I和I等级Q对第一和第二偏置电压进行反馈控制,使得I和I等于Q分别达到I路径和Q路径的预期偏置点值(S206); 以预定的时间间隔循环执行步骤2和3(S208),使得I和& t; Q保持一致地是I-path和Q-path的预期偏置点值。 该解决方案使DQPSK解调器的偏置点能够被锁定在任何预期的偏置点值,便于数字化的实现,并且不容易受到影响。
    • 38. 发明授权
    • Optical differential phase-shift keyed signal demodulator
    • 光差分相移键控信号解调器
    • US08379295B2
    • 2013-02-19
    • US12687570
    • 2010-01-14
    • Xueyan ZhengKevin McCallion
    • Xueyan ZhengKevin McCallion
    • G02F2/00G02F1/35
    • H04L27/223G02F2/00H04B10/677H04L27/2071
    • A phase-shift keyed signal demodulator is disclosed including a filter positioned to receive an input beam, a first photodiode positioned to receive light reflected from the filter, and a second photodiode positioned to receive light transmitted through the filter. A difference between outputs of the first and second photodiodes is interpreted to determine a data value encoded in the input beam. In another embodiment N filters receive inputs from a splitter and include transmission functions offset from one another. N pairs of photo diodes receive the transmitted and reflected beams from each filter and a decoder converts the outputs of the pairs of photodiodes to one or more data symbols.
    • 公开了一种相移键控信号解调器,其包括定位成接收输入光束的滤光器,定位成接收从滤光器反射的光的第一光电二极管和定位成接收透过滤光器的光的第二光电二极管。 解释第一和第二光电二极管的输出之间的差异,以确定在输入光束中编码的数据值。 在另一个实施例中,N个滤波器从分离器接收输入并且包括彼此偏移的传输函数。 N对光电二极管接收来自每个滤波器的发送和反射光束,并且解码器将该对光电二极管的输出转换为一个或多个数据符号。
    • 39. 发明申请
    • Fiber-Optic Automatic Gain Control Systems and Methods
    • 光纤自动增益控制系统和方法
    • US20130004181A1
    • 2013-01-03
    • US13173155
    • 2011-06-30
    • Juan C. JuarezDavid W. YoungJoseph E. Sluz
    • Juan C. JuarezDavid W. YoungJoseph E. Sluz
    • G02F2/00H04B10/06
    • H04B10/1121
    • Methods and systems to control a gain applied to a free-space optical (FSO) signal to reduce time-varying intensity fluctuations. An optical pre-amplifier may provide a first, relatively moderate gain with low noise factor (NF). A second optical amplifier may provide a second gain. Amplification may include doped fiber amplification (DFA), such as erbium-doped fiber amplification (EDFA) and/or Raman amplification. A variable optical attenuator (VOA) may be controllable with a relatively fast response time to reduce the time-varying intensity fluctuations. The VOA may effectively control an overall system gain. The gain of the first and/or second optical amplifier may also be controllable to reduce the time-varying intensity fluctuations. Optical intensities may be detected at one or more locations to support one or more feed-forward and/or feedback control loops. A clamp may be applied when an optical power reaches a threshold.
    • 用于控制应用于自由空间光(FSO)信号的增益以减少时变强度波动的方法和系统。 光学前置放大器可以提供具有低噪声因子(NF)的第一相对适度的增益。 第二光放大器可以提供第二增益。 扩增可以包括掺杂光纤放大(DFA),例如掺铒光纤放大(EDFA)和/或拉曼放大。 可变光衰减器(VOA)可以以相对较快的响应时间来控制,以减少随时间变化的强度波动。 美国之音可以有效地控制整个系统的增益。 第一和/或第二光放大器的增益也可以是可控的,以减少随时间变化的强度波动。 可以在一个或多个位置处检测光强度以支持一个或多个前馈和/或反馈控制回路。 当光功率达到阈值时,可以应用钳位。