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    Device for reducing lock-up time of Frequency synthesizer
    3.
    发明授权
    Device for reducing lock-up time of Frequency synthesizer 失效
    减少频率合成器锁定时间的装置

    公开(公告)号：US06411660B1

    公开(公告)日：2002-06-25

    申请号：US09080518

    申请日：1998-05-18

    申请人： Tae-won Oh

    发明人： Tae-won Oh

    IPC分类号： H03D318

    CPC分类号： H03L7/23 ,  H03J5/0272 ,  H03L7/10 ,  H04B1/40 ,  H04B1/44

    摘要： A device for reducing a lock-up time in a digital cordless telephone. The telephone includes a first frequency synthesizer for generating a reference frequency, a receiver having a first mixer for mixing the reference frequency with an input frequency to generate a first intermediate frequency and a second mixer to generate a second intermediate frequency, and a transmitter having a third mixer to generate a transmission frequency. The device includes: a band switching controller for receiving an inverse channel selection signal; and a second frequency synthesizer for generating third and fourth intermediate frequencies to the second and third mixers, respectively, according to a channel selection signal for setting transmission and reception modes. The second frequency synthesizer includes: a voltage controlled oscillator for generating a frequency according to a charge pump voltage applied at an input of the oscillator; a loop filter for shaping the charge pump voltage being applied to the input of the voltage controlled oscillator; and a phase locked loop for comparing the reference frequency with a frequency output from the voltage controlled oscillator to generate a voltage according to a phase difference therebetween to the input of the voltage controlled oscillator via the loop filter. The band switching controller maintains an input voltage of the voltage controlled oscillator upon receiving the inverse channel selection signal.

    摘要翻译： 一种减少数字无绳电话锁定时间的设备。 该电话包括用于产生参考频率的第一频率合成器，具有用于混合参考频率与输入频率以产生第一中频的第一混频器的接收机和用于产生第二中频的第二混频器，以及具有 第三混频器产生传输频率。 该装置包括：频带切换控制器，用于接收反向信道选择信号; 以及第二频率合成器，用于根据用于设置发送和接收模式的信道选择信号分别向第二和第三混频器产生第三和第四中频。 第二频率合成器包括：压控振荡器，用于根据在振荡器的输入端施加的电荷泵电压产生频率; 用于对施加到压控振荡器的输入端的电荷泵电压进行整形的环路滤波器; 以及锁相环，用于将参考频率与从压控振荡器输出的频率进行比较，以通过环路滤波器将电压根据它们之间的相位差产生到压控振荡器的输入端。 频带切换控制器在接收到反向信道选择信号时保持压控振荡器的输入电压。

    Method for decreasing and compensating the transmission loss at a wavelength-division-multiplexed passive optical network and an apparatus therefor
    5.
    发明授权
    Method for decreasing and compensating the transmission loss at a wavelength-division-multiplexed passive optical network and an apparatus therefor 有权
    用于减少和补偿在波分复用无源光网络上的传输损耗的方法及其装置

    公开(公告)号：US07171123B2

    公开(公告)日：2007-01-30

    申请号：US10353745

    申请日：2003-01-28

    申请人： Chang Hee Lee ,  Tae Won Oh ,  Kwang Uk Chu

    发明人： Chang Hee Lee ,  Tae Won Oh ,  Kwang Uk Chu

    IPC分类号： H04J14/02

    CPC分类号： H04J14/0297 ,  H04B10/032 ,  H04B10/2503 ,  H04B10/27 ,  H04B10/272 ,  H04B10/2939 ,  H04B10/2972 ,  H04J14/02 ,  H04J14/0282

    摘要： The present invention relates to a wavelength-division multiplexed passive optical network. In particular, it relates to a technology for minimizing the optical loss at a wavelength-division multiplexed passive optical network based on wavelength-locked light source Thereby it improves the transmission quality and increases the transmission distance.A 4-port optical path setting device of the present invention increases the amount of light injected into an optical transmitter and thereby improves the wavelength-locking characteristic of a light source. In addition, it can decrease the optical transmission loss in an optical transmission path, and by an optical amplifier being inserted therein; it can also compensate the optical loss in an optical transmission path.In the present invention, a 4-port optical path setting device having the characteristics described above and a method for fault recovery without an additional optical loss are presented.

    摘要翻译： 波分复用无源光网络技术领域本发明涉及一种波分复用无源光网络。 具体地说，涉及一种基于波长锁定光源的波分复用无源光网络的光损耗最小化的技术，从而提高了传输质量并提高了传输距离。 本发明的4端口光路设定装置增加了光发射机的光量，从而提高了光源的波长锁定特性。 另外，可以减少光传输路径中的光传输损耗，并且其中插入光放大器; 它还可以补偿光传输路径中的光损耗。 在本发明中，提出了具有上述特征的4端口光路设定装置和没有附加光损耗的故障恢复方法。

    Bidirectional add/drop multiplexer and bidirectional add/drop amplifier module for band-split bidirectional networks
    8.
    发明授权
    Bidirectional add/drop multiplexer and bidirectional add/drop amplifier module for band-split bidirectional networks 失效
    用于频带分离双向网络的双向分插复用器和双向放大放大器模块

    公开(公告)号：US06832017B2

    公开(公告)日：2004-12-14

    申请号：US09767702

    申请日：2001-01-24

    申请人： Chang Hee Lee ,  Hyun Deok Kim ,  Jeong Hun Shin ,  Tae Won Oh ,  Yun Hee Cho

    发明人： Chang Hee Lee ,  Hyun Deok Kim ,  Jeong Hun Shin ,  Tae Won Oh ,  Yun Hee Cho

    IPC分类号： G02B628

    CPC分类号： H04J14/0216 ,  H04J14/0208

    摘要： The present invention relates to a bidirectional add/drop multiplexer (BADM) and a bidirectional add/drop amplifier (BADA) module. The present invention includes an N×N arrayed waveguide grating router (AWGR), two optical circulators, two wavelength selective couplers, two optical isolators, and a mid-stage device. The mid-stage device comprises a means for compensating the chromatic dispersion of the optical fibers, a means for flattening the spectral response of the optical amplifiers, a means for suppressing the accumulation of the ASE noise or a combination of these means.

    摘要翻译： 本发明涉及一种双向分插复用器（BADM）和双向放大放大器（BADA）模块。本发明包括一个NxN阵列波导光栅路由器（AWGR），两个光循环器，两个波长选择耦合器 光隔离器和中级装置。 中间级装置包括用于补偿光纤的色散的装置，用于平坦化光放大器的光谱响应的装置，用于抑制ASE噪声的累积的装置或这些装置的组合。