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：EP1810426A1

公开(公告)日：2007-07-25

申请号：EP05820436.3

申请日：2005-11-08

Applicant: Korea Advanced Institute of Science and Technology

Inventor： LEE, Chang-Hee ,  CHOI, Ki-Man

IPC: H04B10/02

CPC classification number: H04B10/5167 ,  H04B10/503 ,  H04B10/5162

Abstract: The present invention relates to an optical modulation method and optical modulation system of a wavelength locked Fabry Perot-Laser Diode (FP-LD) by injecting a broadband light source (BLS) using mutual injection of FP-LDs. More specifically, the present invention relates to a novel modulation technology which embodies a wavelength locked FP-LD capable of being used as an economic light source in an optical network based on a wavelength-division multiplexing passive optical network (WDM-PON). According to the present invention, a light modulation system is suggested comprising: BLS being constructed by mutual injection between two FP-LDs and an optical fiber being used for light transmission; first AWG for filtering light from a plurality of oscillation modes of the BLS into n group; n FP-LDs outputting wavelength locked light which is divided through the first AWG; an encoder being provided at a transmitting end of a subscriber to which the output from the first AWG is transmitted; a circulator outputting light which is inputted through the first AWG; second AWG de-multiplexing WDM signals from the first AWG into n group; and a decoder being provided at a receiving end to which the output from the second AWG is transmitted. Therefore, the present invention makes it possible to provide a more economic light source for WDM-PON subscribers by embodying a wavelength locked FP-LD by injecting a low-cost BLS.

公开(公告)号：EP1810426B1

公开(公告)日：2013-05-29

申请号：EP05820436.3

申请日：2005-11-08

Applicant: Korea Advanced Institute of Science and Technology

Inventor： LEE, Chang-Hee ,  CHOI, Ki-Man

IPC: H04B10/516

CPC classification number: H04B10/5167 ,  H04B10/503 ,  H04B10/5162

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：EP1974482A1

公开(公告)日：2008-10-01

申请号：EP06769255.8

申请日：2006-07-11

Applicant: Korea Advanced Institute of Science and Technology

Inventor： LEE, Chang-Hee ,  CHOI, Ki-Man

IPC: H04B10/20

CPC classification number: H04J14/0226 ,  H04B10/506 ,  H04J14/02 ,  H04J14/0246 ,  H04J14/025 ,  H04J14/0282 ,  H04J2014/0253

Abstract: The present invention relates to a wavelength-division multiplexed passive optical network (WDM-PON) which embodies wavelength-independence of wavelength-locked Fabry Perot- Laser Diode (F-P LD). A WDM-PON of the present invention comprises an optical fiber being used for optical transmission to and from a broadband light source (BLS) with a low noise characteristic; first arrayed waveguide Gratings (AWG) for filtering light transmitted from the BLS which is oscillated in a plural mode into a group of n numbers wherein the first AWG have a bandwidth broader than a bandwidth of one mode of the BLS; n F-P LDs outputting wavelength-locked light by light being injected through the first AWG; a circulator bypassing and outputting wavelength-division multiplexed signals which are inputted through the first AWG and the optical fiber; and second AWG de-multiplexing the WDM signals into a group of n numbers wherein the second AWG have a bandwidth broader than the bandwidth of the BLS to be injected, wherein the number n is either the number of output ports of the first or second AWG or the number of channels of the WDM signals.

公开(公告)号：EP1829171A1

公开(公告)日：2007-09-05

申请号：EP04808537.7

申请日：2004-12-22

Applicant: Korea Advanced Institute of Science and Technology

Inventor： LEE, Chang-Hee ,  BAIK, Jin-Serk ,  CHOI, Ki-Man ,  MIN, Hyun-Sik ,  PARK, Keun-Youl

IPC: H01S3/0941

CPC classification number: H01S5/4006 ,  H01S5/005 ,  H01S5/0064 ,  H01S5/0427 ,  H01S5/0612 ,  H01S5/0656 ,  H01S5/4068

Abstract: Disclosed is a broadband light source (BLS) necessary to implement wavelength-locked Fabry-Perot (FP) laser diodes (LDs) applicable to an optical subscriber network. The BLS is based on a method using mutual injection of low-cost FP LDs and a method using FP LDs undergoing chirping. A power level of a light emitting diodes (LED), an erbium-doped fiber amplifier (EDFA), or a super luminescent diode (SLD) used as the conventional BLS is low and its cost is high, such that the conventional BLS is inefficient. However, the present invention can easily implement a low-cost BLS using proposed FP LDs.