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    • 4. 发明授权
    • Optical modulation device having bias reset means
    • 具有偏置复位装置的光调制装置
    • US5742268A
    • 1998-04-21
    • US554356
    • 1995-11-06
    • Arihide Noda
    • Arihide Noda
    • G02F1/03G02F1/01G02F1/295
    • G02F1/0123
    • An optical modulation device comprises an optical modulator in which the operating point is varied according to a bias voltage. A phase deviation of an operating point from a selected optimal operating point is detected by a phase comparator based on an output light of the optical modulator. The bias voltage is generated within a predetermined voltage range by a DC amplifier so as to reduce the phase deviation. A reset circuit resets the bias voltage at the ground voltage associated with the selected optimal operating point when the optical modulator is powered up and passes the bias voltage to the optical modulator at all other times.
    • 光调制装置包括光调制器,其中工作点根据偏置电压而变化。 基于光调制器的输出光,由相位比较器检测工作点与所选择的最佳工作点的相位偏差。 通过DC放大器在预定电压范围内产生偏置电压,以减少相位偏差。 当光调制器通电时,复位电路复位与所选择的最佳工作点相关联的接地电压处的偏置电压,并且在所有其他时间将偏置电压传递到光学调制器。
    • 5. 发明授权
    • Light transmission device capable of stably transmitting a modulated
output light beam
    • 能够稳定地发送调制输出光束的光传输装置
    • US5432629A
    • 1995-07-11
    • US5552
    • 1993-01-19
    • Minoru ShikadaArihide Noda
    • Minoru ShikadaArihide Noda
    • H04B10/155H04J14/02H04B10/04
    • H04B10/572H04B10/504
    • In a light transmission device operable in response to a sequence of input digital signals to produce an output light beam, a modulated light beam is produced from a laser device as a result of frequency shift keying carried out under a designed modulation index and is transmitted as the output light beam on one hand and is sent to a Fabry-Perot interferometer on the other hand to produce an optical output beam which has an output level deviated in dependence upon a variation of a modulation index relative to the designed modulation index. A feedback signal is fed back to a drive circuit which is supplied with the input signals and which is operable to control the laser device. The feedback signal serves to adjust the modulation index of the laser device to the designed modulation index. A controller may be included to control a central frequency of the output light beam by producing a bias signal which is added to the feedback signal.
    • 在可响应于一系列输入数字信号以产生输出光束的光传输装置中,由于在设计的调制指数下进行频移键控的结果,从激光装置产生调制光束,并以 输出光束一方面被送到法布里 - 珀罗干涉仪,另一方面产生一个光输出光束,该光输出光束的输出电平根据调制指数相对于设计的调制指数的变化而偏离。 反馈信号被反馈到驱动电路,该驱动电路被提供有输入信号,并且其可操作以控制激光器件。 反馈信号用于将激光装置的调制指数调整到设计的调制指数。 可以包括控制器以通过产生添加到反馈信号的偏置信号来控制输出光束的中心频率。
    • 6. 发明授权
    • Setting operation point in optical modulation apparatus
    • 设置光调制装置的操作点
    • US5646771A
    • 1997-07-08
    • US617331
    • 1996-03-18
    • Arihide Noda
    • Arihide Noda
    • G02F1/03G02F1/01
    • G02F1/0123
    • A light outputted from a laser diode is intensity-modulated by an optical modulator in accordance with a modulation signal in which a sine wave signal outputted from a low frequency oscillator is superposed on a data signal by a drive amplifier. The output light from the optical modulator is branched by an optical coupler and converted into an electric signal by a light receiving element. A frequency component of the electric signal corresponding to the sine wave signal is extracted by a band pass filter. The extracted electric signal is amplified by a variable gain amplifier with a gain. A phase difference between the amplified electric signal and the sine wave signal is determined by a phase detector and a bias voltage controlled based on the phase difference is supplied from a DC amplifier to the optical modulator. The gain of the variable gain amplifier is changed such that the peak value of the extracted electric signal falls within an allowable voltage range of the phase detector. The operation point can be kept at a stable point even if displacement of the operation point is caused due to temperature change and degradation as time.
    • 从激光二极管输出的光由光调制器根据调制信号进行强度调制,其中由低频振荡器输出的正弦波信号由驱动放大器叠加在数据信号上。 来自光调制器的输出光由光耦合器分支,并由光接收元件转换成电信号。 通过带通滤波器提取与正弦波信号对应的电信号的频率分量。 所提取的电信号由具有增益的可变增益放大器放大。 放大电信号和正弦波信号之间的相位差由相位检测器确定,并且基于相位差控制的偏压由DC放大器提供给光调制器。 改变可变增益放大器的增益,使得提取的电信号的峰值落在相位检测器的容许电压范围内。 即使由于温度变化和劣化而导致操作点的位移,操作点也可以保持在稳定点。