OPTICAL TRANSMITTER
    1.
    发明申请
    OPTICAL TRANSMITTER 有权
    光学发射器

    公开(公告)号:US20090060528A1

    公开(公告)日:2009-03-05

    申请号:US12108089

    申请日:2008-04-23

    IPC分类号: H04B10/04

    摘要: A technology to automatically control the biasing of an optical duobinary transmitter using a single-drive LN-MZ modulator is provided. A low-frequency signal is amplitude modulated onto a voltage signal input into a Mach-Zehnder optical modulator 22. The optical output from the optical modulator 22 is detected by an optical detection subsystem 30. In a bias control subsystem 40, the low-frequency signal component amplitude modulated onto the electrical signal is detected from the optical output, and a DC bias voltage applied to the optical modulator is controlled such that the low-frequency signal component is either minimized or maximized.

    摘要翻译: 提供了一种使用单驱动LN-MZ调制器自动控制光双向发射器的偏置的技术。 低频信号被调制到输入到马赫 - 策德尔光调制器22的电压信号上。光调制器22的光输出由光检测子系统30检测。在偏置控制子系统40中,低频信号 从光输出检测调制到电信号上的信号分量幅度,并且控制施加到光调制器的DC偏置电压,使得低频信号分量被最小化或最大化。

    Optical transmitter
    2.
    发明授权
    Optical transmitter 有权
    光发射机

    公开(公告)号:US08098998B2

    公开(公告)日:2012-01-17

    申请号:US12108089

    申请日:2008-04-23

    IPC分类号: H04B10/04

    摘要: A technology to automatically control the biasing of an optical duobinary transmitter using a single-drive LN-MZ modulator is provided. A low-frequency signal is amplitude modulated onto a voltage signal input into a Mach-Zehnder optical modulator 22. The optical output from the optical modulator 22 is detected by an optical detection subsystem 30. In a bias control subsystem 40, the low-frequency signal component amplitude modulated onto the electrical signal is detected from the optical output, and a DC bias voltage applied to the optical modulator is controlled such that the low-frequency signal component is either minimized or maximized.

    摘要翻译: 提供了一种使用单驱动LN-MZ调制器自动控制光双向发射器的偏置的技术。 低频信号被调制到输入到马赫 - 策德尔光调制器22的电压信号上。光调制器22的光输出由光检测子系统30检测。在偏置控制子系统40中,低频信号 从光输出检测调制到电信号上的信号分量幅度,并且控制施加到光调制器的DC偏置电压,使得低频信号分量被最小化或最大化。

    Spectrum Analyzer
    4.
    发明授权
    Spectrum Analyzer 失效
    频谱分析仪

    公开(公告)号:US5847559A

    公开(公告)日:1998-12-08

    申请号:US704622

    申请日:1996-12-23

    IPC分类号: G01R23/173 H03L7/18 G01R27/26

    CPC分类号: H03L7/1806 G01R23/173

    摘要: An improved local oscillator for use in a digital step sweep is capable of minimizing dynamic spurious which is an inverse of the unit step time T.sub.step. The local oscillator includes a random clock delay 12 which provides a random clock 12.sub.rndclk to the DDS 40 to modify a time length of the unit step time T.sub.step for sweeping the local oscillator to be random.

    摘要翻译: PCT No.PCT / JP96 / 00115 Sec。 371日期:1996年12月23日 102(e)日期1996年12月23日PCT提交1996年1月23日PCT公布。 公开号WO96 / 23231 日期1996年8月1日用于数字步进扫描的改进的本地振荡器能够最小化动态寄生,这是单位步进时间Tstep的倒数。 本地振荡器包括随机时钟延迟12,其向DDS 40提供随机时钟12rndclk,以修改用于将本地振荡器扫描为随机的单位步进时间Tstep的时间长度。

    Interactive communication system for downloading large amount data
    5.
    发明授权
    Interactive communication system for downloading large amount data 失效
    用于下载大量数据的交互式通信系统

    公开(公告)号:US6052715A

    公开(公告)日:2000-04-18

    申请号:US855455

    申请日:1997-05-13

    摘要: An information terminal transmits small amount data such as a command to a Web server on the internet to an asymmetric router via an interactive radio network. The asymmetric router transmits the command to the Web server via the internet. The asymmetric router transmits large amount data (for example, HTML formatted browser data) from the Web server to a data superimposing broadcast apparatus. The data superimposing broadcast apparatus determines a scheduled time of broadcasting according to a data amount. The scheduled time is transmitted to the information terminal via the asymmetric router and the interactive radio network. When the scheduled time comes, the large amount data is superimposed on an empty portion of a television signal, and is broadcasted. The information terminal carries out a predetermined processing operation whereby a broadcast receiving circuit is turned on, and the television signal on which the large amount data has been superimposed is received. The received data then can be displayed in a display device and the like. Therefore, even in a portable information terminal, it is possible to provide an interactive communication system which can transmit large amount data at a high speed.

    摘要翻译: 信息终端经由交互式无线网络将诸如命令的少量数据发送到互联网上的Web服务器到非对称路由器。 非对称路由器通过互联网将命令发送到Web服务器。 非对称路由器将大量数据(例如,HTML格式的浏览器数据)从Web服务器传送到数据叠加广播装置。 数据叠加广播装置根据数据量确定广播的调度时间。 预定的时间经由非对称路由器和交互式无线电网络发送到信息终端。 当预定时间到来时,大量数据叠加在电视信号的空白部分,并被广播。 信息终端执行预定的处理操作,由此广播接收电路被接通,并且接收到其上叠加了大量数据的电视信号。 所接收的数据然后可以显示在显示装置等中。 因此,即使在便携式信息终端中,也可以提供能够高速传送大量数据的交互式通信系统。

    Spectrum analyzer
    6.
    发明授权
    Spectrum analyzer 失效
    频谱分析仪

    公开(公告)号:US06233288B1

    公开(公告)日:2001-05-15

    申请号:US09070094

    申请日:1998-04-03

    IPC分类号: H04L2706

    CPC分类号: G01R23/173

    摘要: A spectrum analyzer having an improved local oscillator for use in a digital step sweep is capable of minimizing a dynamic spurious response which is inverse proportional to a unit step time in the step sweep. The local oscillator includes a random clock delay which provides a random clock to a direct digital synthesizer to incorporate random timings in a time length of the unit step time for sweeping the local oscillator. In another aspect, the local oscillator includes a sweep step number control which maximizes the number of steps in the step sweep to ultimately decrease the dynamic spurious response.

    摘要翻译: 具有用于数字步进扫描的改进的本地振荡器的频谱分析仪能够使与步进扫描中的单位步进时间成反比的动态杂散响应最小化。 本地振荡器包括随机时钟延迟,其向直接数字合成器提供随机时钟,以在用于扫描本地振荡器的单位步进时间的时间长度内并入随机定时。 在另一方面,本地振荡器包括扫频步数控制,其最大化阶梯扫描中的步数,以最终降低动态杂散响应。

    Measuring method by spectrum analyzer
    7.
    发明授权
    Measuring method by spectrum analyzer 失效
    频谱分析仪测量方法

    公开(公告)号:US06229316B1

    公开(公告)日:2001-05-08

    申请号:US08707032

    申请日:1996-09-03

    IPC分类号: G01R2316

    CPC分类号: G01R23/16 G01R29/26

    摘要: A spectrum analyzer in which automatic setting of parameters such as band width is done by the analyzer without manual operator input and noise measurements are determined and displayed to the operator. This is accomplished by an input signal being supplied to a frequency mixer via an input variable attenuator. The frequency of the input signal is mixed with the frequency of a local signal from a frequency sweep generator. The mixed signal is then supplied to a band pass filter and the output of the filter is amplified by an amplifier. The frequency of the amplified output is mixed with the frequency of a local signal from a local oscillator by a frequency mixer. The intermediate frequency signal is taken out by a band pass filter and the output is detected by a detector. The detected output is converted into a digital signal by an A/D converter after passing through a low pass filter and the digital signal is stored in a buffer memory. A CPU sets an attenuation amount. The CPU also controls a frequency sweep generator by controlling a ramp voltage generator through a timing controller. The CPU sets a sweep frequency band, a band width RBW, a band width VBW, and a sampling period, as well as a display control of the data stored in the buffer memory on a display unit.

    摘要翻译: 频谱分析仪,其中通过分析仪完成诸如带宽等参数的自动设置,无需手动操作员输入和噪声测量,并将其显示给操作者。 这通过经由输入可变衰减器被提供给混频器的输入信号来实现。 输入信号的频率与来自频率扫描发生器的本地信号的频率混合。 然后将混合信号提供给带通滤波器,并且滤波器的输出由放大器放大。 放大输出的频率通过混频器与来自本地振荡器的本地信号的频率混合。 中频信号由带通滤波器取出,输出由检测器检测。 在通过低通滤波器之后,A / D转换器将检测到的输出转换成数字信号,数字信号存储在缓冲存储器中。 CPU设置衰减量。 CPU还通过定时控制器控制斜坡电压发生器来控制频率扫描发生器。 CPU设置扫描频带,带宽RBW,带宽VBW和采样周期,以及在显示单元上存储在缓冲存储器中的数据的显示控制。