公开(公告)号：US20140199074A1

公开(公告)日：2014-07-17

申请号：US14050465

申请日：2013-10-10

Applicant: Electronics and Telecommunications Research Institute

Inventor： Seung-Hyun CHO ,  Seung-Il MYONG ,  Kyeong-Hwan DOO ,  Jie-Hyun LEE ,  Sang-Soo LEE ,  Jong-Hyun Lee

IPC: H04B10/27 ,  H04L27/26

CPC classification number: H04B10/27 ,  H04B10/548 ,  H04L27/2649 ,  H04L27/2697

Abstract: An orthogonal frequency division multiple access-passive optical network including a plurality of optical network units each configured to generate orthogonal frequency division multiplexed signals, which are allocated thereto, based on a central frequency for frequency division multiplexing that is allocated in advance, and to use the generated signals in upstream transmission.

Abstract translation: 一种正交频分多址无源光网络，包括多个光网络单元，每个光网络单元被配置为基于预先分配的用于频分复用的中心频率而分配给它们的正交频分复用信号，并且使用 在上行传输中产生的信号。

公开(公告)号：US20140219659A1

公开(公告)日：2014-08-07

申请号：US14082902

申请日：2013-11-18

Applicant: Electronics and Telecommunications Research Institute

Inventor： Kyeong-Hwan DOO ,  Hak-Jeon BANG ,  Seung-Il MYONG ,  Seung-Hyun CHO ,  Jie-Hyun LEE

IPC: H04L27/26

CPC classification number: H04L27/2608 ,  H04L5/0039 ,  H04L5/0053 ,  H04L5/0064 ,  H04L27/2697 ,  H04Q11/0067

Abstract: There are provided a method of allocating upstream bandwidth resources and a method of transmitting upstream data in an orthogonal frequency division multiple access-open optical subscriber network. The method of allocating an upstream bandwidth resource according to an embodiment of the invention includes receiving queue status information from each optical network unit (ONU), and allocating an upstream bandwidth by providing to each ONU a 2-D upstream bandwidth map on a subcarrier-time resource through a frame synchronized at constant cycles, based on the queue status information received from each ONU.

Abstract translation: 提供了一种分配上行带宽资源的方法和在正交频分多址接入开放光用户网络中发送上行数据的方法。 根据本发明实施例的分配上行带宽资源的方法包括从每个光网络单元（ONU）接收队列状态信息，并且通过向每个ONU提供子载波上的带宽映射的分配上行带宽， 基于从每个ONU接收的队列状态信息，通过以恒定周期同步的帧的时间资源。

公开(公告)号：US20140104599A1

公开(公告)日：2014-04-17

申请号：US14049595

申请日：2013-10-09

Applicant: Electronics and Telecommunications Research Institute

Inventor： Won-Kyoung LEE ,  Jyung-Chan LEE ,  Seung-Il MYONG

IPC: G01M11/00

CPC classification number: G01M11/3145

Abstract: A method of improving the performance of an optical time domain reflectometer (OTDR) is provided. The method according to an embodiment of the present invention can increase accuracy of a distance of the OTDR through an initial calibration method with respect to the refractive index of an optical fiber, and can accurately detect a fault position and accurately analyze a fault cause through a real-time calibration method with respect to the refractive index of the optical fiber when faults and performance degradation occur.

Abstract translation: 提供了一种提高光时域反射计（OTDR）性能的方法。 根据本发明的实施例的方法可以通过初始校准方法提高OTDR的距离相对于光纤的折射率的精度，并且可以精确地检测故障位置并且通过以下方式准确地分析故障原因 当发生故障和性能下降时，相对于光纤的折射率的实时校准方法。

公开(公告)号：US20130294768A1

公开(公告)日：2013-11-07

申请号：US13838309

申请日：2013-03-15

Applicant: ELECTRONICS AND TELECOMMUNICATIONS RESEARCH INSTITUTE

Inventor： Han-Hyub LEE ,  Seung-Il MYONG ,  Eui-Suk JUNG ,  Sang-Soo LEE

IPC: H04B10/071

CPC classification number: H04B10/071

Abstract: An optical layer monitoring apparatus and method thereof are provided. According to an embodiment of the present invention, an optical layer monitoring apparatus including an optical time domain reflectometer (OTDR) function so as to monitor an optical path of a passive optical network (PON), and a method for improving accuracy of measured monitoring results using the optical layer monitoring apparatus are provided. Therefore, it is possible to enable a user to continuously detect distortion or attenuation along the optical path, and to quickly recover from the distortion or attenuation along the optical path when distortion or attenuation is detected.

Abstract translation: 提供了一种光学层监测装置及其方法。 根据本发明的实施例，包括光时域反射计（OTDR）功能以监视无源光网络（PON）的光路的光层监视装置以及用于提高测量监视结果精度的方法 提供了使用光学层监视装置。 因此，可以使用户能够连续地检测沿着光路的失真或衰减，并且当检测到失真或衰减时，可以沿着光路的失真或衰减快速恢复。

公开(公告)号：US20140219661A1

公开(公告)日：2014-08-07

申请号：US14082796

申请日：2013-11-18

Applicant: Electronics and Telecommunications Research Institute

Inventor： Kyeong-Hwan DOO ,  Seung-Il MYONG ,  Han-Hyub LEE ,  Seung-Hyun CHO ,  Jie-Hyun LEE ,  Sang-Soo LEE

IPC: H04J14/02 ,  H04L7/00

CPC classification number: H04J14/0227 ,  H04J3/1694 ,  H04J14/0246 ,  H04J14/025

Abstract: Provided is a method of selecting a wavelength of an optical network unit including selecting a pre-loaded default wavelength as an available wavelength candidate or the wavelength that has been changed when a preset wavelength changing condition is satisfied as the available wavelength candidate, acquiring frame synchronization for a downstream signal having the same wavelength as the selected available wavelength candidate, and transmitting a registration request message to an optical line terminal (OLT) from which the downstream signal has been transmitted when the frame synchronization is acquired, assigning the available wavelength candidate to an available wavelength used for communication with the OLT and registering the terminal in the OLT when a registration allowance message is received from the OLT.

Abstract translation: 提供了一种选择光网络单元的波长的方法，包括选择预先加载的默认波长作为可用波长候选，或当满足预设波长变化条件时已经改变的波长作为可用波长候选，获取帧同步 对于与选择的可用波长候选具有相同波长的下行信号，并且当获取帧同步时，向已经发送了下行信号的光线路终端（OLT）发送注册请求消息，将可用波长候选分配给 用于与OLT通信的可用波长，并且当从OLT接收到注册允许消息时，在OLT中注册终端。

公开(公告)号：US20140205279A1

公开(公告)日：2014-07-24

申请号：US14054209

申请日：2013-10-15

Applicant: Electronics and Telecommunications Research Institute

Inventor： Won-Kyoung LEE ,  Seung-Il MYONG

IPC: H04B10/071

CPC classification number: H04B10/071

Abstract: There are provided a device for monitoring an optical link fault and a method thereof. According to an embodiment of the invention, the device for monitoring an optical link fault and the method thereof apply an optical link fault monitoring signal to an optical link and precisely identify a type of the fault using waveforms of a reflected signal returned from the optical link or a wavelength dependence of reflected signal intensity.

Abstract translation: 提供了一种用于监视光链路故障的装置及其方法。 根据本发明的实施例，用于监视光链路故障的装置及其方法将光链路故障监视信号应用于光链路，并使用从光链路返回的反射信号的波形来精确地识别故障类型 或反射信号强度的波长依赖性。

公开(公告)号：US20130302029A1

公开(公告)日：2013-11-14

申请号：US13866647

申请日：2013-04-19

Applicant: Electronics and Telecommunications Research Institute

Inventor： Jie-Hyun LEE ,  Seung-Il MYONG ,  Han-Hyub LEE ,  Sang-Soo LEE

IPC: H04B10/07

CPC classification number: H04B10/07 ,  H04B10/07957 ,  H04J14/0246 ,  H04J14/025 ,  H04J14/0256 ,  H04J14/0257 ,  H04J14/0258

Abstract: A wavelength tuning time measurement apparatus and method for a multi-wavelength passive optical network (MW PON) are provided. The wavelength tuning time measurement apparatus for measuring a wavelength tuning time of a wavelength-variable light source included in the MW PON system includes an optical filter configured to pass only light of a certain wavelength bandwidth and a photo detector configured to sense light passing through the optical filter. The wavelength tuning time is a time taken from a time when a wavelength change signal is transferred to the wavelength-variable light source, to a time when light starts to be successively sensed by the photo detector.

Abstract translation: 提供了一种用于多波长无源光网络（MW PON）的波长调谐时间测量装置和方法。 用于测量MW PON系统中包括的波长可变光源的波长调谐时间的波长调谐时间测量装置包括被配置为仅通过一定波长带宽的光的光学滤波器和被配置为感测通过 滤光片 波长调谐时间是从波长变化信号传输到波长可变光源的时间到光开始被光电检测器连续感测的时间。