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    • 4. 发明授权
    • Optical modulation device and bias voltage control method
    • 光调制装置及偏压控制方法
    • US08891959B2
    • 2014-11-18
    • US13482385
    • 2012-05-29
    • Yuji Ishii
    • Yuji Ishii
    • H04B10/08
    • H04B10/50595G02F1/0123G02F2203/20
    • An optical modulation device includes a generating circuit that generates a low-frequency signal, an average value of amplitude as an alternating-current component of the low-frequency signal being different from a center value of the amplitude of the low-frequency signal, a superimposing unit that superimposes the low-frequency signal on a data signal, an optical modulator that modulates, using the superimposition of the low-frequency signal by the superimposing unit, light from a light source and outputs a light signal, a calculating circuit that calculates an amplitude average value and an amplitude center value of a low-frequency component obtained from the light signal output by the optical modulator, and a controller that controls a bias voltage of the optical modulator such that the amplitude average value is brought closer to the amplitude center value of the frequency component calculated by the calculating circuit.
    • 光调制装置包括生成低频信号的发生电路,作为低频信号的交流分量的振幅的平均值不同于低频信号的振幅的中心值, 叠加单元,用于将低频信号叠加在数据信号上;光调制器,用于通过叠加单元叠加低频信号来调制来自光源的光,并输出光信号;计算电路, 从由光调制器输出的光信号获得的低频分量的幅度平均值和振幅中心值;以及控制器,其控制光调制器的偏置电压使得振幅平均值更接近振幅 由计算电路计算的频率分量的中心值。
    • 6. 发明申请
    • OPTICAL MODULATION DEVICE AND BIAS VOLTAGE CONTROL METHOD
    • 光学调制装置和偏置电压控制方法
    • US20130028614A1
    • 2013-01-31
    • US13482385
    • 2012-05-29
    • Yuji ISHII
    • Yuji ISHII
    • H04B10/04
    • H04B10/50595G02F1/0123G02F2203/20
    • An optical modulation device includes a generating circuit that generates a low-frequency signal, an average value of amplitude as an alternating-current component of the low-frequency signal being different from a center value of the amplitude of the low-frequency signal, a superimposing unit that superimposes the low-frequency signal on a data signal, an optical modulator that modulates, using the superimposition of the low-frequency signal by the superimposing unit, light from a light source and outputs a light signal, a calculating circuit that calculates an amplitude average value and an amplitude center value of a low-frequency component obtained from the light signal output by the optical modulator, and a controller that controls a bias voltage of the optical modulator such that the amplitude average value is brought closer to the amplitude center value of the frequency component calculated by the calculating circuit.
    • 光调制装置包括生成低频信号的发生电路,作为低频信号的交流分量的振幅的平均值不同于低频信号的振幅的中心值, 叠加单元,用于将低频信号叠加在数据信号上;光调制器,用于通过叠加单元叠加低频信号来调制来自光源的光,并输出光信号;计算电路, 从由光调制器输出的光信号获得的低频分量的幅度平均值和振幅中心值;以及控制器,其控制光调制器的偏置电压使得振幅平均值更接近振幅 由计算电路计算的频率分量的中心值。
    • 7. 发明申请
    • Optical Modulators With Controllable Chirp
    • 具有可控啁啾的光学调制器
    • US20110222813A1
    • 2011-09-15
    • US13032899
    • 2011-02-23
    • Mark WebsterKalpendu Shastri
    • Mark WebsterKalpendu Shastri
    • G02F1/035
    • G02F1/2257G02F1/025G02F2203/20G02F2203/25G02F2203/255
    • A semiconductor-based optical modulator is presented that includes a separate phase control section to adjust the amount of chirp present in the modulated output signal. At least one section is added to the modulator configuration and driven to create a pure “phase” signal that will is added to the output signal and modify the eiφ term inherent in the modulation function. The phase modulation control section may be located within the modulator itself (with one segment on each arm, driven by the same input signal), or may be disposed “outside” of the modulator on either the input waveguiding section or the output waveguiding section. The phase control section may be formed to comprise multiple segments (of different lengths), with the overall phase added to the propagating signal controlled by selecting the different segments to be energized to impart a phase delay to a signal propagating through the energized section(s).
    • 提出了一种基于半导体的光调制器,其包括单独的相位控制部分,用于调节调制输出信号中存在的线性调频音量。 至少一个部分被添加到调制器配置并被驱动以产生将被添加到输出信号并且修改ei&phgr的纯“相”信号。 术语固有的调制功能。 相位调制控制部分可以位于调制器本身内(每个臂上的一个段由相同的输入信号驱动),或者可以设置在输入波导部分或输出波导部分上的调制器的“外部”。 相位控制部分可以形成为包括多个段(不同长度),其中通过选择不同的被激励的段来控制传播信号的总相位,以向通过通电部分传播的信号施加相位延迟 )。
    • 9. 发明授权
    • Methods to control phase shifts of delay demodulation devices
    • 控制延迟解调装置相移的方法
    • US07813032B2
    • 2010-10-12
    • US12412847
    • 2009-03-27
    • Junichi HasegawaKazutaka Nara
    • Junichi HasegawaKazutaka Nara
    • G02F2/00
    • G02F1/21G02F1/0136G02F1/0147G02F2001/212G02F2203/20H04B10/677H04L27/223
    • The present invention provides methods to control phase shift of delay demodulation devices to reduce Polarization Dependent wavelength (PDλ) to be less than, for example, 0.5 GHz (i.e. 0.004 nm). The method to control phase shift in a Planar Lightwave Circuit (PLC) for demodulating Differential Quadrature Phase Shift Keying (DQPSK) comprising two Mach-Zehnder interferometers, each having two arm waveguides and heaters placed on the two arm waveguides, the method comprising the steps of: (first step) supplying electricity to at least one predetermined heater on the two arm waveguides of each Mach-Zehnder interferometer such that Polarization Dependent wavelength (PDλ) is reduced as electricity is supplied to the predetermined heaters; (second step) inserting a half-wave plate in the two arm waveguides of each Mach-Zehnder interferometer after PDλ is reduced in the first step; (third step) supplying electricity to the predetermined heater on the at least one of the two Mach-Zehnder interferometers used in the first step to control phases of the DQPSK signals after the half-wave plates are inserted.
    • 本发明提供了控制延迟解调装置的相移以减少偏振相关波长(PDλ)小于例如0.5GHz(即0.004nm)的方法。 用于解调平面光波电路(PLC)中用于解调差分正交相移键控(DQPSK)的方法,该差分正交相移键控(DQPSK)包括两个Mach-Zehnder干涉仪,每个具有两个臂波导和放置在两个臂波导上的加热器,该方法包括步骤 (第一步骤)向每个马赫 - 策德尔干涉仪的两个臂波导上的至少一个预定加热器供电,从而当向预定加热器供电时,偏振相关波长(PDλ)减小; (第二步骤)在第一步骤中减少PDλ之后,在每个马赫 - 策德尔干涉仪的两个臂波导中插入半波片; (第三步骤)向在第一步骤中使用的两个马赫策德尔干涉仪中的至少一个上的预定加热器供电,以在半波片插入之后控制DQPSK信号的相位。