利索-全球专利检索

  1. 登录
  2. 注册

搜索结果

28 条记录 (耗时 0.018 秒)

    Radio-over-fiber (RoF) transmission system
    2.
    发明授权
    Radio-over-fiber (RoF) transmission system 有权

    公开(公告)号：US10200125B2

    公开(公告)日：2019-02-05

    申请号：US15337119

    申请日：2016-10-28

    申请人： ELECTRONICS AND TELECOMMUNICATIONS RESEARCH INSTITUTE

    发明人： Seung Hyun Cho ,  Jong Hyun Lee ,  Hwan Seok Chung ,  Sun Me Kim

    IPC分类号： H04B10/2575 ,  H04B10/27 ,  H04B7/0413

    摘要： A radio-over-fiber (RoF) transmission system includes at least one baseband unit (BBU) connected to a core network of a service provider that provides a mobile Internet service, an optical line terminal (OLT) configured to convert a radio signal received from the at least one BBU into an optical signal, an optical distribution network (ODN) comprising an optical fiber and an optical splitter, at least one optical network unit (ONU) configured to receive the optical signal from the OLT via the ODN and convert the optical signal into a radio signal, and at least one remote radio head (RRH) configured to receive the radio signal from the at least one ONU and output the radio signal via a plurality of antennas.

    Optical network system using wavelength channels included in O-band
    7.
    发明授权
    Optical network system using wavelength channels included in O-band 有权

    公开(公告)号：US10476625B2

    公开(公告)日：2019-11-12

    申请号：US15798807

    申请日：2017-10-31

    申请人： ELECTRONICS AND TELECOMMUNICATIONS RESEARCH INSTITUTE

    发明人： Han Hyub Lee ,  Heuk Park ,  Hwan Seok Chung

    IPC分类号： H04J14/02 ,  H04B10/572 ,  H04B10/27 ,  H04J14/08

    摘要： Wavelength channels used in the optical network system are classified into downstream channels used to transmit optical signals from an optical line terminal (OLT) to an optical network unit (ONU) and upstream channels that are used to transmit optical signals from the ONU to the OLT. The wavelength channels are included in an O-band and may not overlap each other. One of the upstream channels are allocated to a wavelength band (for example, a zero-dispersion window) in which a four-wave mixing occurs. A wavelength spacing between the upstream channels and the downstream channels is determined based on a performance of separating the upstream channels and the downstream channels in a bidirectional optical sub assembly (BOSA) of the ONU. Also, a wavelength spacing between the downstream channels is determined based on a performance of separating the downstream channels in the BOSA.

    Polarization control device and method
    9.
    发明授权
    Polarization control device and method 有权
    极化控制装置及方法

    公开(公告)号：US09274354B2

    公开(公告)日：2016-03-01

    申请号：US14090707

    申请日：2013-11-26

    申请人： Electronics and Telecommunications Research Institute

    发明人： Sun Hyok Chang ,  Hwan Seok Chung

    IPC分类号： G02B6/10 ,  G02F1/01

    CPC分类号： G02F1/0136

    摘要： A polarization control device in accordance with an exemplary embodiment of the present invention may include a first polarization converter for converting a polarization angle of an input optical signal in response to first control voltages, a second polarization converter for converting a polarization angle of an input optical signal in response to second control voltages, and a third polarization converter for converting an optical signal received from the first polarization converter or the second polarization converter into a first output optical signal having a linear polarization state and outputting the first output optical signal.

    摘要翻译： 根据本发明的示例性实施例的偏振控制装置可以包括用于响应于第一控制电压转换输入光信号的偏振角的第一偏振转换器，用于转换输入光学器件的偏振角的第二偏振转换器 响应于第二控制电压的信号;以及第三偏振转换器，用于将从第一偏振转换器或第二偏振转换器接收的光信号转换为具有线性偏振状态的第一输出光信号并输出​​第一输出光信号。