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    Apparatus and method for phase control of tunable external cavity lasers
    1.
    发明授权
    Apparatus and method for phase control of tunable external cavity lasers 有权
    可调外腔激光器的相位控制装置和方法

    公开(公告)号：US06912235B2

    公开(公告)日：2005-06-28

    申请号：US10210039

    申请日：2002-07-31

    申请人： Douglas W. Anthon ,  Jill D. Berger ,  Alexander A. Tselikov ,  Stephen J. Hrinya ,  Howard S. Lee ,  Alan A. Fennema ,  Man F. Cheung

    发明人： Douglas W. Anthon ,  Jill D. Berger ,  Alexander A. Tselikov ,  Stephen J. Hrinya ,  Howard S. Lee ,  Alan A. Fennema ,  Man F. Cheung

    IPC分类号： H01S5/042 ,  H01S5/0687 ,  H01S5/14 ,  H01S3/098 ,  H01S3/13

    CPC分类号： H01S5/141 ,  H01S5/042 ,  H01S5/0687 ,  H01S5/143

    摘要： An apparatus and method for controlling the phase of a tunable laser is provided. Stabilization of the mode of a laser beam is provided as the laser is tuned to a target frequency. For one embodiment, a laser generates a reference beam and an output beam. The power of each of beam is measured by optical detectors, and a ratio thereof is utilized to detect when a mode hop occurs as the laser is coarsely tuned. The average of the pre and post mode hop ratios is utilized as a control setpoint while finely tuning the laser to the target frequency. Wavelength lockers, optical power dividers and optical detectors are utilized to determine power levels of the reference and output beams while also monitoring frequency characteristics thereof. A control unit utilizes the outputs from the wavelength locker to control the operation of the extended cavity laser during and after tuning.

    摘要翻译： 提供了一种用于控制可调激光器的相位的装置和方法。 当激光被调谐到目标频率时，提供激光束的模式的稳定性。 对于一个实施例，激光器产生参考光束和输出光束。 每个光束的功率由光学检测器测量，并且其比例用于检测当激光器被粗调谐时何时出现模式跳跃。 将前和后模式跳比的平均值用作控制设定值，同时将激光器精细地调谐到目标频率。 利用波长锁定器，光功率分配器和光学检测器来确定参考和输出光束的功率电平，同时还监视其频率特性。 控制单元利用来自波长锁定器的输出来调节调谐期间和之后的扩展腔激光器的操作。

    Laser power-drive circuit having a scaling DAC supplying a scaled reference signal to a plurality of scaled DAC's that supply a plurality of scaled output signals
    3.
    发明授权
    Laser power-drive circuit having a scaling DAC supplying a scaled reference signal to a plurality of scaled DAC's that supply a plurality of scaled output signals 失效
    具有缩放DAC的激光功率驱动电路为缩放的DAC提供缩放的参考信号，所述缩放的DAC提供多个缩放的输出信号

    公开(公告)号：US5640381A

    公开(公告)日：1997-06-17

    申请号：US612993

    申请日：1996-03-08

    申请人： David Ernest Call ,  Stephen J. Hrinya ,  Jerry Elden Hurst, Jr. ,  Glen Alan Jaquette ,  Anthony Juliana, Jr.

    发明人： David Ernest Call ,  Stephen J. Hrinya ,  Jerry Elden Hurst, Jr. ,  Glen Alan Jaquette ,  Anthony Juliana, Jr.

    IPC分类号： G11B7/0045 ,  G11B7/125 ,  G11B20/18 ,  H01S5/0683 ,  G11B7/00

    CPC分类号： G11B7/126 ,  H01S5/0683 ,  G11B20/182 ,  G11B7/0045

    摘要： An optical disk recorder employs laser drive signals having diverse current or power levels. A scaling digital-analog-converter (DAC) supplies a scaled reference signal to a plurality of scaled DACs. The scaled DACs supply the diverse laser drive signals. Calibrating the scaling DAC calibrates the scaled DACs. A base array of DACs include not only the scaling DAC but a plurality of base array DACs. Such base array DACs control reading operations as well as supplying a threshold current. The threshold current is that laser drive signal current level below which laser 25 does not emit a laser beam. During writing, the CUT current is added to the laser drive currents supplied by the scaled DACs. A desired CUT current is determined by calculating a slope of the laser drive current to emission of radiation. Then the slope is extrapolated to a zero emission point below which no coherent emission of radiation occurs.

    摘要翻译： 光盘记录器采用具有不同电流或功率电平的激光驱动信号。 缩放数字模拟转换器（DAC）将缩放的参考信号提供给多个缩放的DAC。 缩放的DAC提供多种激光驱动信号。 校准缩放DAC校准缩放的DAC。 DAC的基本阵列不仅包括缩放DAC，而且包括多个基本阵列DAC。 这种基本阵列DAC控制读取操作以及提供阈值电流。 阈值电流是激光器驱动信号电流水平低于激光器25不发射激光束。 在写入期间，CUT电流被添加到由缩放DAC提供的激光驱动电流。 通过计算激光驱动电流对发射辐射的斜率来确定期望的CUT电流。 然后将斜率外推到零点以下，不超过辐射发生相干发射。

    Magneto-optical preamplifier
    4.
    发明授权
    Magneto-optical preamplifier 失效
    磁光前置放大器

    公开(公告)号：US06259670B1

    公开(公告)日：2001-07-10

    申请号：US09160466

    申请日：1998-09-24

    申请人： Stephen J. Hrinya

    发明人： Stephen J. Hrinya

    IPC分类号： G11B700

    CPC分类号： G11B20/10 ,  G11B11/10515 ,  G11B11/10595

    摘要： In a magneto-optical storage device, a digitally adjustable preamplifier stage balances polarization signal levels through use of a digital compensation value. A separate digital compensation value is stored for the signals corresponding to each detector head. Each time a different detector head is activated, the digital compensation value for the polarization signals corresponding to that head is accessed. The accessed digital compensation value is input to a digital to analog converter (DAC), which produces a voltage for setting the gain of the adjustable amplifier.

    摘要翻译： 在磁光存储装置中，数字可调前置放大器级通过使用数字补偿值来平衡极化信号电平。 对于与每个检测器头对应的信号，存储单独的数字补偿值。 每次激活不同的检测器头时，访问与该磁头相对应的极化信号的数字补偿值。 所访问的数字补偿值被输入到数模转换器（DAC），其产生用于设置可调放大器的增益的电压。

    System and method of correcting gain and offset error in a signal amplifier for a position sensitive detector
    6.
    发明授权
    System and method of correcting gain and offset error in a signal amplifier for a position sensitive detector 失效
    用于位置敏感检测器的信号放大器校正增益和偏移误差的系统和方法

    公开(公告)号：US06330279B1

    公开(公告)日：2001-12-11

    申请号：US09111636

    申请日：1998-07-07

    申请人： Karl A. Belser ,  Stephen J. Hrinya ,  Max Artusy

    发明人： Karl A. Belser ,  Stephen J. Hrinya ,  Max Artusy

    IPC分类号： H04K708

    CPC分类号： H03K5/02 ,  G01S17/46 ,  H03F3/087 ,  H03F3/2171

    摘要： A system and method is disclosed for correcting gain and offset errors in a signal amplifier for a position sensitive detector. The present invention eliminates the need to perform division for normalization by holding constant a signal proportional to the sum of the two signals generated by the position sensitive detector. First the two signals generated by the position sensitive detector are pulse-width modulated with a common variable duty cycle clock, and then the resulting modulated signals are low-pass filtered to extract the DC component. The duty cycle is varied so that the sum of the two DC components is held constant. In the preferred embodiment, the means for varying the duty cycle are closed-loop feedback and open-loop feed forward. The closed-loop feedback gives long term accuracy and the open-loop feed forward gives rapid settling time. Once the sum of the DC components of the modulated signals is held constant, the individual DC components of the modulated signals are normalized and may be used for servo or other applications.

    摘要翻译： 公开了一种用于校正用于位置敏感检测器的信号放大器中的增益和偏移误差的系统和方法。 本发明消除了通过保持与由位置敏感检测器产生的两个信号的和成比例的信号的恒定来进行归一化的需要。 首先，由位置敏感检测器产生的两个信号用公共可变占空比时钟进行脉冲宽度调制，然后将所得到的调制信号进行低通滤波以提取直流分量。 使占空比变化，使得两个DC分量的和保持恒定。 在优选实施例中，用于改变占空比的装置是闭环反馈和开环馈送。 闭环反馈给出长期准确度，开环前馈给出快速建立时间。 一旦调制信号的直流分量的总和保持恒定，调制信号的各个DC分量被归一化，并可用于伺服或其他应用。

    Controlling a media master writing machine to produce curvilinear servo sector patterns
    9.
    发明授权
    Controlling a media master writing machine to produce curvilinear servo sector patterns 失效
    控制媒体主机写入机，生成曲线伺服扇区模式

    公开(公告)号：US06204989B1

    公开(公告)日：2001-03-20

    申请号：US09075781

    申请日：1998-05-11

    申请人： Stephen J. Hrinya ,  Karl A. Belser

    发明人： Stephen J. Hrinya ,  Karl A. Belser

    IPC分类号： G11B5596

    CPC分类号： G11B21/10 ,  G11B5/59633 ,  G11B23/0042 ,  G11B23/0085

    摘要： Curvilinear servo sector patterns are produced on a master media by determining a series of offsets between a radially aligned reference and the desired curvilinear servo sector and expressing each offset as a delay that can be expressed in settings for controlling a master writer. Incorporation of the delay into the master writer allows a curvilinear servo sector pattern to be produced using data mapping that is ordinarily used for the radially aligned servo sector pattern. Thus, curvilinear servo sector patterns with a desired resolution are produced without increasing computational overhead or memory requirements, or decreasing throughput. The delay can be converted into control settings such as sector delay, clock cycle delay and residual fractional delay settings that each represent a portion of the delay. In certain embodiments, a piece-wise linear approximation of the curvilinear shape can be implemented to reduce the amount of required control data, and a master writer controller that generates pulses for multiple lasers can be implemented.

    摘要翻译： 通过确定径向对准的基准和期望的曲线伺服扇区之间的一系列偏移并将每个偏移量表示为可以在用于控制主写入器的设置中表达的延迟，在主介质上产生曲线性伺服扇区图案。 将延迟结合到主写入器中允许使用通常用于径向对准的伺服扇区图案的数据映射来产生曲线的伺服扇区图案。 因此，产生具有期望分辨率的曲线伺服扇区模式，而不增加计算开销或存储器要求，或降低吞吐量。 延迟可以转换成控制设置，例如扇区延迟，时钟周期延迟和剩余分数延迟设置，每个延迟设置表示延迟的一部分。 在某些实施例中，可以实现曲线形状的分段线性近似以减少所需控制数据的量，并且可以实现为多个激光器生成脉冲的主写入器控制器。