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    • 31. 发明申请
    • OPTICAL MODULATOR
    • 光学调制器
    • WO2005096086A1
    • 2005-10-13
    • PCT/EP2004/003627
    • 2004-03-31
    • PIRELLI & C. S.P.A.GHIDINI, SilviaNESPOLA, Antonio
    • GHIDINI, SilviaNESPOLA, Antonio
    • G02F1/225
    • G02F1/2257G02F1/0123G02F2001/212
    • An optical modulator (1) comprising an optical splitter (11a; 11b) for splitting an input light beam into a first and second light beam; a first and a second waveguide arm (9, 12) connected to said optical splitter (11a; 11b) for receiving and transmitting therethrough said first and second light beam, respectively, said waveguide arms (9, 12) each including a core region (32) comprising a group IV semiconductor material or a combination of group IV semiconductor materials; an optical combiner (14a; 14b) connected to said f irst and second waveguide arm (9, 12) for receiving said first and second light beam and combine them into an output light beam, a first and a second electrode structure (20, 21) associated with said first and second waveguide arm (9, 12), respectively; a driving circuit (80) for supplying voltage to said first and second electrode structure (20, 21), characterized in that said driving circuit (80) is adapted to supply a first modulation voltage superimposed to a first bias voltage to the first electrode structure (20) and a second modulation voltage superimposed to a second bias voltage to the second electrode structure (21).
    • 一种光调制器(1),包括用于将输入光束分成第一和第二光束的光分路器(11a; 11b) 连接到所述光分路器(11a; 11b)的第一和第二波导臂(9,12),用于分别接收和透过所述第一和第二光束,所述波导臂(9,12)各自包括芯区域 32),其包含IV族半导体材料或IV族半导体材料的组合; 连接到所述第一和第二波导臂(9,12)的光学组合器(14a; 14b),用于接收所述第一和第二光束并将它们组合成输出光束;第一和第二电极结构(20,21 )分别与所述第一和第二波导臂(9,12)相关联; 用于向所述第一和第二电极结构(20,21)提供电压的驱动电路(80),其特征在于,所述驱动电路(80)适于将叠加到第一偏置电压的第一调制电压提供给第一电极结构 (20)和叠加到第二偏置电压的第二调制电压到第二电极结构(21)。
    • 33. 发明申请
    • A MODULATOR CONTROL SYSTEM
    • 调制器控制系统
    • WO2004072715A1
    • 2004-08-26
    • PCT/GB2004/000606
    • 2004-02-16
    • AZEA NETWORKS LIMITEDWEBB, Stephen, MichaelOBERLAND, Richard
    • WEBB, Stephen, MichaelOBERLAND, Richard
    • G02F1/01
    • G02F1/0123G02F1/225
    • An optical communications system comprising: an optical input and an output, a source of input signals in an asymmetric format and having a duty cycle, a modulator for modulating the input signals, to produce an asymmetric signal, the modulator comprising a Mach-Zehnder interferometer; drive means for driving the modulator at a predetermined modulator drive voltage; bias means for applying a bias voltage to the modulator; adjustment means for adjusting a first variable chosen from one of the bias voltage, gain voltage, or duty cycle in response to the relationship existing between changes in the amplitude of the asymmetric signal and changes in the first variable, characterised in that the system further comprising varying means for varying a second variable, different to the first variable and chosen from one of the bias voltage, gain voltage or duty cycle in response to adjustments made to the first variable; and a monitor for recording the average optical output power.
    • 一种光通信系统,包括:光输入和输出,非对称格式的输入信号源,并具有占空比,用于调制输入信号的调制器,以产生非对称信号,所述调制器包括马赫 - 曾德干涉仪 ; 用于以预定的调制器驱动电压驱动所述调制器的驱动装置; 用于向调制器施加偏置电压的偏置装置; 调整装置,用于响应于不对称信号的振幅变化与第一变量的变化之间的关系而调整从偏置电压,增益电压或占空比之一中选择的第一变量,其特征在于,系统还包括 用于改变与第一变量不同并响应于对第一变量的调整从偏置电压,增益电压或占空比之一中选择的第二变量的变化装置; 以及用于记录平均光输出功率的监视器。
    • 35. 发明申请
    • 光強度変調装置
    • 光强度调制装置
    • WO2004021074A1
    • 2004-03-11
    • PCT/JP2003/010982
    • 2003-08-28
    • 古河電気工業株式会社遠藤 浩
    • 遠藤 浩
    • G02F1/01
    • H04B10/505G02F1/0123G02F2203/21H04B10/50575H04B10/58
    • 簡易な構成で、変調曲線Lのドリフト値を精度高く求め、精度の高い最適バイアス電圧値に制御することを目的とし、電気信号(S2)の振幅値とパイロット信号(Va)の振幅値との合算値が駆動電圧Vπ以内となる電気信号(S2)によって光信号(S1)を強度変調し光変調信号(S3)を外部出力するとともに光変調信号(S3)をモニタするモニタPD(3a)を有したLN変調器(3)と、バイアス電圧(Vb)を出力するDAコンバータ(15)と、基本波fpのパイロット信号(Va)を生成するシンセサイザ(17)と、バイアス電圧(Vb)とパイロット信号(Va)とを重畳する加算器(20)と、基本波fp成分に対する2倍高調波2fp成分の比を演算して変調曲線のドリフトを求め、該ドリフトを相殺するバイアス電圧(Vb)を生成させるコントローラ(C)とを備える。
    • 通过简单的结构,可以高精度地获得调制曲线L的漂移值并进行控制,以高精度获得最佳的偏置电压值。 光强度调制装置包括:LN调制器(3),通过电信号(S2)的振幅和导频信号的振幅之和(S2)对光信号(S1)进行强度调制 (Va)在驱动电压Vpi内,以便在外部输出调光信号(S3),并具有用于监视光调制信号(S3)的监视器PD(3a)。 用于输出偏置电压(Vb)的DA转换器(15); 用于产生基本波fp的导频信号(Va)的合成器(17); 用于将偏置电压(Vb)叠加在导频信号(Va)上的加法器(20); 以及用于计算两倍高次谐波2fp分量相对于基波fp分量的比率以获得调制曲线漂移并产生用于补偿漂移的偏置电压(Vb)的控制器(C)。
    • 36. 发明申请
    • MODULATOR ARRANGEMENT
    • 调制器布置
    • WO2003062915A1
    • 2003-07-31
    • PCT/GB2003/000012
    • 2003-01-06
    • BOOKHAM TECHNOLOGYGRIFFIN, RobertBORLEY, Stephen, James
    • GRIFFIN, RobertBORLEY, Stephen, James
    • G02F1/313
    • G02F1/3136G02F1/0123G02F1/3138
    • Disclosed is a modulator arrangement for modulating an optical signal for use in an optical communications or data system comprising a laser for producing an optical signal of a selected wavelength, which signal is applied to an intensity modulator adapted to modulate the intensity of the signal in dependence on a respective drive voltage. The intensity modulator has two outputs, the output power of each output being monitored by a respective two photon absorption detector, the detector signals then being fed to a differential amplifier. The output of the differential amplifier is used to drive a feedback arrangement to a control electrode(s) of the intensity modulator.
    • 公开了用于调制用于光通信或数据系统的光信号的调制器装置,所述光信号或数据系统包括用于产生所选波长的光信号的激光器,所述激光器被施加到适用于依赖于调制信号强度的强度调制器 在相应的驱动电压上。 强度调制器具有两个输出,每个输出的输出功率由相应的两个光子吸收检测器监测,然后检测器信号被馈送到差分放大器。 差分放大器的输出用于驱动反馈装置到强度调制器的控制电极。
    • 38. 发明申请
    • マッハツェンダ型光変調器の半波長電圧測定方法及び装置
    • 用于测量MACH-ZEHNDER型光学调制器的半波电压的方法和装置
    • WO2003016853A1
    • 2003-02-27
    • PCT/JP2002/007784
    • 2002-07-31
    • 住友大阪セメント 株式会社宮崎 徳一清水 亮
    • 宮崎 徳一清水 亮
    • G01M11/00
    • G02F1/0123G02F1/0121G02F1/225
    • A method and a device for measuring the half−wave voltage of a Mach−Zehnder type optical modulator accurately and without depending on the bias variation of an optical modulator. The method of measuring the half−wave voltage of the Mach−Zehnder type optical modulator comprising the steps of applying a high−frequency AC signal (34) and a monitoring low−frequency AC signal (35) in a superimposed manner to a Mach−Zehnder type optical modulator (1), or applying the both respectively to separately constituted electrodes, and observing the low−speed response of an output light from the optical modulator (1), wherein the half−wave voltage at a frequency to be measured of the Mach−Zehnder type optical modulator (1) is measured by using the voltage amplitude of the high−frequency AC signal (34) when the intensity change of an output light by the monitoring low−frequency AC signal (35) is almost zero with the voltage amplitude of the high−frequency AC signal (34) kept variable.
    • 一种用于在不依赖于光学调制器的偏差变化的情况下精确地测量马赫 - 曾德型光学调制器的半波电压的方法和装置。 测量马赫 - 策德尔型光调制器的半波电压的方法包括以下步骤:将高频AC信号(34)和监视低频AC信号(35)以叠加的方式施加到Mach- Zehnder型光学调制器(1),或将两者分别施加到单独构成的电极上,观察来自光调制器(1)的输出光的低速响应,其中测量频率处的半波电压 当通过监视低频AC信号(35)的输出光的强度变化几乎为零时,通过使用高频AC信号(34)的电压幅度来测量马赫 - 策德尔型光调制器(1) 高频交流信号(34)的电压幅值保持不变。
    • 39. 发明申请
    • COMPOSITE SECOND-ORDER BIAS CONTROL SCHEMES
    • 复合二阶偏差控制方案
    • WO01026256A1
    • 2001-04-12
    • PCT/US2000/024410
    • 2000-09-05
    • G02F1/035G02F1/01H04B10/04H04B10/06H04B10/142H04B10/152H04B10/155G02F1/03H01S3/10
    • G02F1/0123H04B10/505H04B10/50575H04B10/588H04B2210/075
    • A bias control system is adapted to reduce composite second order distortions in an electro-optic modulator (106). The bias control system includes a pilot tone generator (110) that generates a first pilot tone (162) at a first frequency and a second pilot tone (164) at a second frequency. The first and second tones are swept (166) in frequency over a predetermined frequency range with a predetermined sweep rate, to spectrally spread third order distortion products over a larger frequency band, allowing the amplitude of the pilot tones to be increased, thereby increasing the gain of the bias control circuit. The bias control system further includes an optical detector (114) for sampling the output of the electro-optic modulator, wherein the sampled output includes a distortion product resulting from the first and second pilot tones, and a feedback control circuit (116) coupled to the optical detector and to the pilot tone generator for generating an error product (114a) based on the distortion product in the sampled optical output for controlling the bias point of the electro-optic modulator. The bias control system preferably holds the difference between the frequency of the first pilot tone and the frequency of the second pilot tone constant over the entire range of excursion frequencies to allow for the use of fixed frequency demodulators and filters.
    • 偏置控制系统适于减少电光调制器(106)中的复合二阶失真。 偏置控制系统包括导频音产生器(110),其以第二频率产生第一频率的第一导频音(162)和第二频率的第二导频音(164)。 第一和第二音调以预定的扫描速率在预定频率范围内以频率扫描(166),以便在较大频带上频谱扩展三阶失真产物,从而允许增加导频音调的幅度,从而增加 偏置控制电路的增益。 偏置控制系统还包括用于对电光调制器的输出进行取样的光学检测器(114),其中采样的输出包括由第一和第二导频音产生的失真乘积,以及反馈控制电路(116) 光检测器和导频音发生器,用于基于采样光输出中的失真积来产生误差积(114a),用于控制电光调制器的偏置点。 偏置控制系统优选地保持在偏移频率的整个范围上的第一导频音频的频率和第二导频音的频率之间的差异,以允许使用固定频率解调器和滤波器。
    • 40. 发明申请
    • AN ELECTRO-OPTIC MODULATOR HAVING GATED-DITHER BIAS CONTROL
    • 具有栅极偏置控制的电光调制器
    • WO1994028455A1
    • 1994-12-08
    • PCT/US1994006094
    • 1994-05-31
    • UNITED TECHNOLOGIES CORPORATION
    • UNITED TECHNOLOGIES CORPORATIONALLIE, David, J.FARINA, James, D.
    • G02F01/03
    • G02F1/0123G02F2001/212
    • An electro-optic modulator includes a closed loop bias control system for maintaining the modulator at its half-power point by modulating a time varying signal on and off at a modulation frequency fm. The modulation frequency fm is much lower than the frequency components within the spectrum of the time varying signal, such that, energy within the time varying signal spectrum is recovered at the modulation frequency when the modulator is not operating at the half-power point. A phase sensitive demodulator operating at the modulation frequency fm demodulates a signal indicative of the modulator optical output signal to provide a DC voltage signal value indicative of the half-power point bias error value. The time varying voltage signal may be a dither noise signal or any other time varying signal such as a signal with a single frequency component (e.g. a sine or cosine) or a signal with a plurality of frequency components (e.g., a square wave).
    • 电光调制器包括一个闭环偏置控制系统,用于通过以调制频率fm调制时变信号的开和关来将调制器保持在其半功率点。 调制频率fm远低于时变信号频谱内的频率分量,使得当调制器不在半功率点处工作时,时变信号频谱内的能量以调制频率恢复。 以调制频率fm工作的相位敏感解调器解调表示调制器光输出信号的信号,以提供表示半功率点偏差误差值的DC电压信号值。 时变电压信号可以是抖动噪声信号或任何其它时变信号,例如具有单个频率分量(例如正弦或余弦)的信号或具有多个频率分量(例如,方波)的信号。