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    Optical network system using wavelength channels included in O-band
    5.
    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

    Applicant: ELECTRONICS AND TELECOMMUNICATIONS RESEARCH INSTITUTE

    Inventor： Han Hyub Lee ,  Heuk Park ,  Hwan Seok Chung

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

    Abstract: 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.

    Multi-quiet zone-based optical network unit registration method for low-latency service
    8.
    发明授权
    Multi-quiet zone-based optical network unit registration method for low-latency service 有权

    公开(公告)号：US11569911B2

    公开(公告)日：2023-01-31

    申请号：US17367944

    申请日：2021-07-06

    Applicant: ELECTRONICS AND TELECOMMUNICATIONS RESEARCH INSTITUTE

    Inventor： Kwang Ok Kim ,  Kyeong Hwan Doo ,  Jung-yeol Oh ,  Han Hyub Lee ,  Hwan Seok Chung

    IPC: H04B10/27

    Abstract: Disclosed is a method of registering a new optical network unit (ONU) to be performed by an optical line terminal (OLT). The method includes transmitting a ranging notification message to a centralized unit (CU)/distributed unit (DU) to register the new ONU, receiving scheduling information for registering the new ONU from the CU/DU in response to the ranging notification message, transmitting a serial number request message to a service region in which ONUs are present based on the received scheduling information, and when the serial number response message is received from the new ONU in response to the serial number request message, registering the new ONU that transmits a serial number request message. The transmitting of the serial number request message is performed through a multi-quiet zone of a short period.

    Method of tuning wavelength in time and wavelength division multiplexing-passive optical network (TWDM-PON)
    10.
    发明授权
    Method of tuning wavelength in time and wavelength division multiplexing-passive optical network (TWDM-PON) 有权
    波长调谐方法和波分复用无源光网络（TWDM-PON）

    公开(公告)号：US09525507B2

    公开(公告)日：2016-12-20

    申请号：US14740480

    申请日：2015-06-16

    Applicant: ELECTRONICS AND TELECOMMUNICATIONS RESEARCH INSTITUTE

    Inventor： Han Hyub Lee ,  Kwang Ok Kim ,  Kyeong Hwan Doo ,  Sang Soo Lee

    IPC: H04J14/02 ,  H04J14/08

    CPC classification number: H04J14/0246 ,  H04J14/025 ,  H04J14/0256 ,  H04J14/0272 ,  H04J14/0282 ,  H04J14/08 ,  H04Q11/0067 ,  H04Q2011/0064

    Abstract: A method of tuning a wavelength in a TWDM-PON which has a plurality of operable channels is provided. First, a second channel is added as an operating channel of the TWDM-PON in which at least a first channel is working, and then an OLT that is providing a service to an ONU through the first channel requests the ONU to tune to the second channel. In response to receiving the request, the ONU determines whether a downstream wavelength of the second channel has been recorded thereon. According to the determination result, the ONU sends to the OLT an ACK message that indicates that the ONU is able to perform wavelength tuning and then commences wavelength tuning to the second channel, or the ONU sends to the OLT a NACK message that indicates that the ONU is unable to perform wavelength tuning.

    Abstract translation: 提供了一种调整具有多个可操作通道的TWDM-PON中的波长的方法。 首先，添加第二信道作为其中至少第一信道正在工作的TWDM-PON的操作信道，然后通过第一信道向ONU提供业务的OLT请求ONU调谐到第二信道 渠道。 响应于接收到请求，ONU确定第二信道的下行波长是否已被记录在其上。 根据确定结果，ONU向OLT发送指示ONU能够执行波长调谐的ACK消息，然后开始向第二信道进行波长调谐，或者ONU向OLT发送NACK消息，该NACK消息指示 ONU无法进行波长调谐。

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