公开(公告)号：EP1972084B1

公开(公告)日：2013-05-22

申请号：EP06823911.0

申请日：2006-12-05

Applicant: Korea Advanced Institute of Science and Technology

Inventor： LEE, Chang-Hee ,  LEE, Sang-Mook ,  MUN, Sil-Gu

IPC: H04J14/02

CPC classification number: H04J14/0246 ,  H04J14/0226 ,  H04J14/0247 ,  H04J14/025 ,  H04J14/0252 ,  H04J14/0257 ,  H04J14/0282

公开(公告)号：EP2518915A2

公开(公告)日：2012-10-31

申请号：EP10839806.6

申请日：2010-12-23

Applicant: Korea Advanced Institute of Science and Technology

Inventor： LEE, Chang-Hee ,  MOON, Sang-Rok ,  OH, Sang-Min

IPC: H04B10/13

CPC classification number: H04B10/572 ,  H01S5/0656 ,  H04B10/506 ,  H04J14/0213 ,  H04J14/0282

Abstract: The present invention discloses a device and method for controlling a lasing wavelength of a tunable laser, and a wavelength division multiplexed-passive optical network having the same.
In a device and method for controlling a lasing wavelength of a tunable laser, and a wavelength division multiplexed-passive optical network having the same, it is possible to improve performance of the wavelength division multiplexed-passive optical network by automatically controlling a lasing wavelength of a tunable laser to be matched with a transmission wavelength of a wavelength division multiplexer/demultiplexer using optical power or optical beating components obtained by a reflected optical component which is Raleigh backscattered or reflected, and is generated on an optical fiber.

Abstract translation: 本发明盘松动的装置和方法，用于控制可调谐激光器的激光发射波长，并且具有相同的波分复用 - 无源光网络。 在设备和用于控制可调谐激光器的激光发射波长的方法，以及具有该波分多路复用无源光网络中，有可能通过自动地控制的激光发射波长，以改善波分复用 - 无源光网络的性能 的可调谐激光器，以使用光功率或光部件打浆由反射光学部件全部是罗利反向散射或反射而得到的波分多路复用器/多路分离器的传输波长相匹配，并且产生到光纤。

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：EP2787659A1

公开(公告)日：2014-10-08

申请号：EP12852914.6

申请日：2012-01-18

Applicant: Korea Advanced Institute of Science and Technology

Inventor： LEE, Chang-Hee ,  MUN, Sang-Rok ,  YOO, Sang-Hwa ,  KIM, Joon-Young ,  SEO, Byungil ,  KYE, Myeonggyun

IPC: H04B10/2507 ,  H04J14/02

CPC classification number: H04B10/2587 ,  H04J14/0282 ,  H04J2014/0253

Abstract: A WDM-PON system configured to perform an asymmetric wavelength division multiplexing and demultiplexing is proposed. A receiving end of WDM-PON system configured to receive a light transmitted from a transmission end including a first wavelength division multiplexer/demultiplexer includes a second wavelength division multiplexer/demultiplexer configured to demultiplex the light received rom the transmission end, where the second bandwidth of wavelength division multiplexer/demultiplexer is substantially greater than that of the first wavelength division multiplexer/demultiplexer.

Abstract translation: 提出了一种被配置为执行不对称波分复用和解复用的WDM-PON系统。 配置为接收从包括第一波分多路复用器/解复用器的发送端发送的光的WDM-PON系统的接收端包括：第二波分多路复用器/解复用器，被配置为对从发送端接收的光进行解复用，其中第二带宽 波分复用器/解复用器基本上大于第一波分多路复用器/解复用器的波分复用器/解复用器。

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：EP1938478A1

公开(公告)日：2008-07-02

申请号：EP06798671.1

申请日：2006-09-06

Applicant: Korea Advanced Institute of Science and Technology

Inventor： LEE, Chang-Hee ,  PARK, Ju-Hee

IPC: H04B10/08

CPC classification number: H04B10/071 ,  H04J14/02 ,  H04J14/0282 ,  H04J14/0287

Abstract: Disclosed is an apparatus for monitoring failure positions on fibers in a WDM-PON system and a WDM-PON system having the apparatus.

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.