公开(公告)号：EP2357737A2

公开(公告)日：2011-08-17

申请号：EP09819404.6

申请日：2009-10-09

Applicant: Korea Advanced Institute of Science and Technology

Inventor： LEE, Chang-Hee ,  LEE, Jong-Hoon ,  CHOI, Ki-Man ,  MUN, Sil-Gu ,  MOON, Jung-Hyung ,  LEE, Hoon-Keun ,  KIM, Joon-Young ,  OH, Sang-Min

IPC: H04B10/08

CPC classification number: H04B10/0771 ,  G01M11/3136 ,  H04B10/071

Abstract: The present invention discloses a fault localization method and a fault localization apparatus in a Passive Optical Network (PON) and a passive optical network having the same.
A fault localization method in PON according to the present invention comprises a) configuring an optical path of a remote node (RN) selectively by electric power being fed temporarily only when necessary, while the PON is regularly being operated as a passive network; and b) detecting a fault occurring on the selectively configured optical path by inserting a monitoring signal of an OTDR unit, which is positioned in a central office (CO), through the selectively configured optical path.

Abstract translation: 本发明盘松故障定位方法和无源光网络（PON）和具有相同的无源光网络中的故障定位设备。 在PONgemäß的故障定位方法，本发明通过电力选择性包括：a）在远程节点（RN）的光路的配置被馈送暂时只在必要时，当PON被通常为无源网络操作; 和b）检测的故障通过插入OTDR单元的监测信号的选择性地配置光学路径上出现，所有这些都在一个中心局（CO），其定位，通过选择性地配置的光路。

公开(公告)号：EP2080297A1

公开(公告)日：2009-07-22

申请号：EP06843825.8

申请日：2006-11-14

Applicant: Korea Advanced Institute of Science and Technology

Inventor： LEE, Chang-Hee ,  CHOI, Ki-Man ,  MUN, Sil-Gu ,  MOON, Jung-Hyung ,  LEE, Hoon-Keun

IPC: H04B10/13

CPC classification number: H04J14/02 ,  H04J14/0201 ,  H04J14/0226 ,  H04J14/0227 ,  H04J14/0247 ,  H04J14/0252 ,  H04J14/0282 ,  H04J2014/0253

Abstract: The present invention discloses a network architecture for upgrading a legacy time division multiplexing-passive optical network (TDM-PON) to a wavelength division multiplexing-passive optical network (WDM-PON) based next-generation passive optical network (next-generation PON), wherein the legacy TDM-PON comprises: a central office (CO) having a first optical line termination (OLT); a remote node (RN) having a splitter; a single mode fiber (SMF) connecting the first OLT and the splitter; and a first group of one or more optical network terminations (ONTs) being connected to the splitter by a first group of one or more distribution fibers, and wherein the network architecture further comprises: in case that the next-generation PON is a WDM-PON, a first apparatus for combining and splitting wavelength bands being positioned between the SMF and the first OLT, in order to add a second OLT to be used for the WDM-PON within the CO or within another CO which is located in a position different from the CO, while sharing the SMF; a second apparatus for combining and splitting wavelength bands being positioned at a front terminal of the splitter; and an arrayed waveguide grating (AWG) being connected to the second apparatus for combining and splitting wavelength bands within the RN, and being connected to a second group of one or more ONTs by a second group of one or more distribution fibers within the RN or within another RN which is located in a position different from the RN.

公开(公告)号：EP2429100A2

公开(公告)日：2012-03-14

申请号：EP10769903.5

申请日：2010-04-23

Applicant: Korea Advanced Institute of Science and Technology

Inventor： LEE, Chang-Hee ,  MUN, Sil-Gu ,  LEE, Hoon-Keun ,  KIM, Joon-Young

IPC: H04B10/13 ,  H04B10/28 ,  H04B10/02

CPC classification number: H04B10/506 ,  H04J14/0282

Abstract: An optical source for wavelength division multiplexed optical network according to the present invention comprises a broadband light source (BLS); an arrayed waveguide grating (AWG) for spectrum-dividing incoherent light outputted from the BLS; a circulator being connected between the BLS and the AWG; and a plurality of un-polarized light sources (UPLS) being respectively connected to the AWG, wherein the incoherent light which is spectrum-divided by the AWG is injected into the plurality of UPLS and thus the plurality of UPLS is wavelength-locked thereto.
In case of using an optical source for wavelength division multiplexed optical network and a wavelength division multiplexed-passive optical network having the same according to the present invention, It is especially possible to lower dramatically the power of incoherent light being injected into a wavelength-locked Fabry-Perot laser diode, while to enable a high transmission speed of 1.25 Gb/s or more, and possible to further lower noise intensity of a light source at given power of the incoherent light.

Abstract translation: 为波分复用光网络gemäß在本发明的光源包括宽带光源（BLS）; 在阵列波导光栅（AWG），用于光谱分割的非相干光的来自BLS输出; 环行器连接在BLS和AWG之间; 和的非偏振光源（UPLS）多个分别连接到所述AWG，worin非相干光的所有被频谱分割由AWG被注射到UPLS的多元性并因此UPLS的多元性是波长锁定于此。 在使用用于波分复用光网络光源，并且具有相同的雅丁到本发明的波分多路复用无源光网络中的情况下，它是爱尤其能够显着降低的非相干光的功率被注入到一个波长锁定 法布里 - 珀罗激光二极管，而启用的1.25 GB / s以上的传输速率高，并且可能つweiterer在非相干光的给定功率的光源的低噪声强度。

公开(公告)号：EP2398166A2

公开(公告)日：2011-12-21

申请号：EP10741412.0

申请日：2010-02-12

Applicant: Korea Advanced Institute of Science and Technology

Inventor： LEE, Chang-Hee ,  KIM, Joon-Young ,  LEE, Jong-Hoon ,  MUN, Sil-Gu ,  MOON, Jung-Hyung ,  LEE, Hoon-Keun ,  OH, Sang-Min ,  MUN, Sang-Rok

IPC: H04B10/13 ,  H04B10/04

CPC classification number: H04B10/506

Abstract: The present invention discloses a transmission device of a low-noise optical signal having a low-noise multi-wavelength light source, a transmission device of broadcast signals using a low-noise multi-wavelength light source, and an optical access network having the same.
The present invention uses a low-noise multi-wavelength light source (LMLS) which has sufficiently low noises at respective wavelengths, while being lasing at a multi-wavelength. Noises at respective wavelengths are not increased, even though an output light of such an LMLS passes through a wavelength division multiplexer/demultiplexer (a tunable optical filter or an arrayed waveguide grating (AWG), etc.). When using an LMLS, it is possible to embody an optical access network capable of transmitting optical signals at a high-speed and simultaneously transmitting a multicast signal. Further, when embodying an optical amplifier by using a gain medium for an LMLS, it is possible to obtain gain at a broad band without cross-coupling.

Abstract translation: 本发明盘松动具有低噪声多波长光源，使用低噪声多波长光源的广播信号的发送装置中的低噪声的光信号的传输设备，并且到光接入网络具有相同 ， 本发明使用一个低噪声多波长光源（LMLS），其具有在respectivement波长足够低的噪声，而处于多波长激光。 在respectivement波长噪声不增加，即使向寻求LMLS的输出光通过一个波分复用器/解复用器通过（一个可调光滤波器或阵列波导光栅（AWG），等等）。 当在使用LMLS，可以在能够以高速传输光信号，并同时发送多点传播信号的光接入网络来体现。 另外，体现当通过使用增益介质在LMLS的光放大器，它能够获得在宽带增益没有交叉耦合。