公开(公告)号：KR1020090066153A

公开(公告)日：2009-06-23

申请号：KR1020070133784

申请日：2007-12-18

Applicant: 한국전자통신연구원

Inventor： 김병휘 ,  이한협 ,  이지현 ,  김봉태

IPC: H04B10/2581 ,  H04J14/02

CPC classification number: H04J14/0282 ,  H04J14/0246 ,  H04J14/0247 ,  H04J14/0252 ,  H04J2014/0253

Abstract: WDM(wavelength division multiplexing)-PON(Passive Optical Network) system in which the loss according to the spectrum slicing is prevented is provided to prevent the loss by spectrum allocation by transmitting spectrum divided optical. An OLT(Optical Line Terminal)(200) is positioned in station. The optical signal is transmitted to the subscriber side. The optical signal is received from the subscriber side. A seed optical source module(100) is positioned in station. And the seed light consisting of a plurality of wavelengths in which the spectrum is divided is supplied to corresponding optical transmitters of OLT. An ONU(optical Line Unit) converts the optical signal received from OLT into the signal.

Abstract translation: 提供了防止根据频谱限幅的损耗的WDM（波分复用）​​-PON（被动光网络）系统，以防止通过发送频谱分割光学的频谱分配丢失。 OLT（光线路终端）（200）位于站内。 光信号被发送到用户侧。 从用户侧接收光信号。 种子光源模块（100）位于站中。 并且将由频谱分割的多个波长组成的种子光提供给OLT的对应的光发射机。 ONU（光线路单元）将从OLT接收的光信号转换为信号。

公开(公告)号：KR1020090066146A

公开(公告)日：2009-06-23

申请号：KR1020070133776

申请日：2007-12-18

Applicant: 한국전자통신연구원

Inventor： 김태연 ,  이강복 ,  정의석 ,  유제훈 ,  김병휘

IPC: H04B10/25 ,  H04B10/27 ,  H04B10/00

CPC classification number: H04J14/0282 ,  H04J3/1694

Abstract: A method for allocating bandwidth of PON(passive optical network) assigning band according to the bandwidth allocation standards is provided to assign the bandwidth of upward optical network terminal by determining the upper bandwidth of the optical network. Wavelength is divided and wavelength is set up as the respective different wavelength. Each wavelength downstream wavelength time is set up. Data of a packet unit uses wavelength. The data is transmitted to the optical network terminals of the first downstream wavelength. The wave length is changed in the first downstream wavelength time out. The data is transmitted according to the changed wavelength.

Abstract translation: 提供根据带宽分配标准分配PON（无源光网络）分配带宽的方法，通过确定光网络的上带宽来分配向上光网络终端的带宽。 波长被分割，并且波长被设置为相应的不同波长。 每个波长的下游波长时间被设置。 数据包单元的数据使用波长。 数据被发送到第一下行波长的光网络终端。 波长在第一个下游波长时间内变化。 数据根据变化的波长进行传输。

公开(公告)号：KR100889751B1

公开(公告)日：2009-03-24

申请号：KR1020070050243

申请日：2007-05-23

Applicant: 한국전자통신연구원

Inventor： 장승현 ,  이철수 ,  정의석 ,  김병휘

IPC: H04B10/07 ,  H04B10/25 ,  H04B10/00

CPC classification number: H04J14/0226 ,  H04B10/0771 ,  H04B2210/074 ,  H04J14/0227 ,  H04J14/0238 ,  H04J14/0246 ,  H04J14/0282 ,  H04J14/0298

Abstract: Provided are a fault localization apparatus based on an optical communication network and a method thereof. In the fault localization apparatus according to the present invention, a downstream light source is used as a monitoring optical signal instead of using an additional monitoring light source and a subcarrier multiplexing (SCM) monitoring pulse signal of a certain frequency band having no interference with a frequency band of a downstream data signal is used and thus a fault position may be detected at low cost.

公开(公告)号：KR100859713B1

公开(公告)日：2008-09-23

申请号：KR1020060071649

申请日：2006-07-28

Applicant: 한국전자통신연구원

Inventor： 이지현 ,  박만용 ,  정건 ,  김철영 ,  조승현 ,  이우람 ,  김병휘

IPC: H01S3/067

Abstract: 본 발명은 별도의 온도 제어 부품의 사용 없이 외부 온도에 무관하게 출력 광파워와 출력 파장이 일정하게 유지될 수 있는 온도 무의존성 외부공진레이저를 제공한다. 그 외부공진레이저는 반도체 증폭기; 브라그 격자(Bragg Grating)가 형성된 코어 및 상기 코어를 감싸는 클래드를 구비한 광섬유; 및 광섬유를 페룰(ferrule)에 고정하고 음의 열광학 계수를 갖는 열경화성 폴리머;를 포함하고, 브라그 격자가 형성된 부분의 코어를 감싸는 클래드의 두께가 다른 부분의 클래드보다 얇게 형성되며, 상기 열경화성 폴리머가 상기 클래드를 감싸고 있다. 본 발명의 외부공진레이저는 별도의 온도 제어 장치를 부착할 필요가 없어서, 소형 및 저가형으로 제작할 수 있기 때문에, 경제적인 WDM 광가입자망 설계에 있어서, DWDM 시스템 광원으로 유용하게 사용될 수 있다.
외부온도 무의존 광원, 외부공진레이저, thin-film 필터, 브라그 격자

公开(公告)号：KR100842290B1

公开(公告)日：2008-06-30

申请号：KR1020060125108

申请日：2006-12-08

Applicant: 한국전자통신연구원 ,  국민대학교산학협력단

Inventor： 김병휘 ,  박영일

IPC: H04B10/2581 ,  H04B10/40 ,  H04B10/00

CPC classification number: H04J14/0227 ,  H04J14/0226 ,  H04J14/0238 ,  H04J14/0249 ,  H04J14/0282

Abstract: 본 발명은 파장 분할 다중화 방식(WDM : Wavelength Division Multiplexing)기반의 TDM-PON (Time Divsion Multiplexing- Passive Optical Network)시스템에서의 파장 변환 장치와 이를 이용한 광전송 장치 및 방법에 있어서, 각 가입자는 고유 파장을 가질 필요 없이 TDM-PON 시스템에서 이용하던 파장 대역을 이용하여 상향 신호를 전송하고, 동일 ONU(Optical Network Unit)에 속한 각 ONU 상향 신호들은 모두 가입자 지역에 위치한 파장 변환 장치로 라우팅하고 파장 변환 장치에서 고유 파장으로 변환 후 중심국(CO : Central Office)의 OLT를 향해 상향 전송함으로써 WDM 전송을 가능하도록 한다.
본 발명에서는 TDM-PON 시스템에 WDM 시스템을 접목한 하이브리드-PON 시스템 구현을 위한 파장변환 장치와 이를 이용한 원격 노드의 구성 방법을 제시하였다.
제안된 구조에서 ONU는 TDM-PON에서와 동일 파장을 이용하고, 광세기도 TDM-PON시스템에서의 ONU 에 비해 적게 요구되므로, 본 발명은 TDM-PON이 기 설치된 지역에도 WDM을 쉽게 적용할 수 있는 특징을 가지고 있다.
PON, TDM-PON, WDM, 파장변환 장치, RN(원격노드)

公开(公告)号：KR1020080052278A

公开(公告)日：2008-06-11

申请号：KR1020070074111

申请日：2007-07-24

Applicant: 한국전자통신연구원

Inventor： 윤현호 ,  김병휘 ,  김태연 ,  유정주 ,  이강복

IPC: H04B10/00 ,  H04B10/2581 ,  H04B10/25

CPC classification number: H04Q11/0067 ,  H04B10/503 ,  H04B10/572 ,  H04Q2011/0064 ,  H04Q2011/0073

Abstract: A link module of an ONT/ONU with an optical wavelength aligning function in WDM-PON, a link system, and a method of aligning optical wavelength are provided to perform communication by initializing the optical wavelength of the link module automatically without intervention of a user or an installer. An initial information creation unit(111) creates link initiation information which is logical information of a predetermined format for checking a transmission state. A wavelength control unit(113) assigns output wavelengths to be outputted from a wavelength group sequentially. An optical transmission unit(115) transmits an assigned optical signal including the link initiation information to the assigned wavelength, whenever assigning the output wavelength from the wavelength control unit. A wavelength selection unit(119) stops the sequential assignment to the wavelength control unit if a response optical signal including response initiation information is received.

Abstract translation: 提供在WDM-PON中具有光波长对准功能的ONT / ONU的链路模块，链路系统和对准光波长的方法，以通过在不干预用户的情况下自动初始化链路模块的光波长来进行通信 或安装程序。 初始信息创建单元（111）创建作为用于检查传输状态的预定格式的逻辑信息的链接发起信息。 波长控制单元（113）依次分配从波长组输出的输出波长。 只要分配来自波长控制单元的输出波长，光传输单元（115）将包括链路启动信息的分配的光信号发送到分配的波长。 如果接收到包括响应发起信息的响应光信号，则波长选择单元（119）停止对波长控制单元的顺序分配。

公开(公告)号：KR100825763B1

公开(公告)日：2008-04-29

申请号：KR1020070001646

申请日：2007-01-05

Applicant: 한국전자통신연구원 ,  한국정보통신대학교 산학협력단

Inventor： 유정주 ,  김병휘 ,  김남욱 ,  이승진 ,  강민호

IPC: H04B10/27 ,  H04L12/24 ,  H04B10/2581

CPC classification number: H04Q11/0067 ,  H04J14/04 ,  H04Q2011/0086

Abstract: A dynamic bandwidth allocation apparatus and a method thereof for transmission efficiency extension in a WDM/TDM-PON(Wavelength Division Multiplexed/Time Division Multiplexed-Passive Optical Network) network are provided to maintain basic bandwidth allocation equity in a sub group layer during uplink data transmission and process variable traffic load efficiently by an HF-DBA(Hierarchical Fair-Dynamic Bandwidth Allocation) algorithm, thereby maintaining high network transmission efficiency and the service efficiency of the sub group. A sub group service weight table stores each of service weight information about M sub groups comprised of N ONUs(Optical Network Units). An ONU service weight table(20) stores each of service weight information about the N ONUs belonging to each sub group. A DBA(Dynamic Bandwidth Allocation) agent allocates bandwidth to each sub group and each ONU within the sub groups on the basis of the service weight information stored in the sub group service weight table and the ONU service weight table. A sub group time window table(26) stores the bandwidth allocated to the sub groups. An ONU time slot table(25) stores the allocated bandwidth to each ONU. A variable laser diode outputs different M wavelengths of optical signals with the bandwidth allocated to each sub group. A reception unit receives an uplink optical signal transmitted from each ONU during a time slot section corresponding to the bandwidth allocated to each ONU.

Abstract translation: 提供了一种在WDM / TDM-PON（波分复用/时分复用无线光网络）网络中用于传输效率扩展的动态带宽分配装置及其方法，用于在上行链路数据期间维持子组层中的基本带宽分配权益 通过HF-DBA（分级公平动态带宽分配）算法有效地传输和处理可变业务负载，从而保持较高的网络传输效率和子组的服务效率。 子组服务权重表存储关于由N个ONU（光网络单元）组成的M个子组的各个服务权重信息。 ONU服务权重表（20）存储关于属于每个子组的N个ONU的每个服务权重信息。 根据存储在子组服务权重表和ONU服务权重表中的服务权重信息，DBA（动态带宽分配）代理向每个子组和子组中的每个ONU分配带宽。 子组时间窗表（26）存储分配给子组的带宽。 ONU时隙表（25）将分配的带宽存储到每个ONU。 可变激光二极管输出不同的M波长的光信号，带宽分配给每个子组。 在对应于分配给每个ONU的带宽的时隙部分期间，接收单元接收从每个ONU发送的上行链路光信号。

公开(公告)号：KR100819054B1

公开(公告)日：2008-04-02

申请号：KR1020060125131

申请日：2006-12-08

Applicant: 한국전자통신연구원

Inventor： 이철수 ,  정의석 ,  장승현 ,  김병휘

IPC: H04L27/18

CPC classification number: H04L27/227 ,  H04L2027/0069

Abstract: An apparatus and a method for restoring a carrier wave in a base-band receiver of an MPSK system are provided to obtain a uniform acquisition time regardless of a frequency offset. An apparatus for restoring a carrier wave in a base-band receiver of an MPSK(M-ary Phase Shift Keying) system comprises a phase detecting unit(120), a frequency detecting unit(140), and a lock detecting unit(160). The phase detecting unit detects a phase offset of a base-band signal which is received in the apparatus and whose phase is shifted. The frequency detecting unit detects a frequency offset based on the output of the phase detecting unit. The lock detecting unit checks whether a frequency offset of the carrier wave is removed or not, and switches so as to use the output of the phase detecting unit or the frequency detecting unit for acquiring the carrier wave according to the checked result.

Abstract translation: 提供用于恢复MPSK系统的基带接收机中的载波的装置和方法，以获得均匀的采集时间，而不管频率偏移如何。 一种用于恢复MPSK（M元相移键控）系统的基带接收机中的载波的装置，包括相位检测单元（120），频率检测单元（140）和锁定检测单元（160） 。 相位检测单元检测在装置中接收并且其相位偏移的基带信号的相位偏移。 频率检测单元基于相位检测单元的输出检测频率偏移。 锁定检测单元检查是否消除了载波的频率偏移，并且根据检查结果进行切换以使用相位检测单元或频率检测单元的输出来获取载波。

公开(公告)号：KR1020070108422A

公开(公告)日：2007-11-12

申请号：KR1020060102456

申请日：2006-10-20

Applicant: 한국전자통신연구원

Inventor： 김병휘 ,  박만용 ,  조승현 ,  이우람 ,  이지현 ,  정건 ,  김철영

IPC: H04B10/00 ,  H04B10/291 ,  H04B10/25 ,  H04B10/2581

CPC classification number: H01S5/50 ,  H01S5/06812 ,  H04J14/02 ,  H04J14/0282

Abstract: An RSOA reusing a downlink optical signal by dynamic current injection and a driving apparatus thereof are provided to adjust dynamically a current injected to the RSOA according to the size of an input optical signal and reduce the residual ER(Extinction Ratio) of the optical signal, thereby reducing the power penalty of uplink transmission and improving transmission quality. An RSOA(Reflective Semiconductor Optical Amplifier)(600) includes a reflecting surface and an optical amplifying semiconductor. The reflecting surface reflects an input optical signal. The optical amplifying semiconductor is positioned in one side of the reflecting surface. The polarity of a first signal is reverse to the polarity of the input optical signal. A second signal modulates the input optical signal reflected from the reflecting surface into an output optical signal. The first and second signals are combined and injected to the optical amplifying semiconductor.

Abstract translation: 提供通过动态电流注入重新使用下行链路光信号的RSOA及其驱动装置，以根据输入光信号的大小动态调整注入RSOA的电流，并减少光信号的残留ER（消光比） 从而降低上行传输的功率损失，提高传输质​​量。 RSOA（反射半导体光放大器）（600）包括反射表面和光放大半导体。 反射面反射输入光信号。 光放大半导体位于反射面的一侧。 第一信号的极性与输入光信号的极性相反。 第二信号将从反射表面反射的输入光信号调制成输出光信号。 将第一和第二信号组合并注入光放大半导体。

公开(公告)号：KR1020070104196A

公开(公告)日：2007-10-25

申请号：KR1020060096600

申请日：2006-09-29

Applicant: 한국전자통신연구원

Inventor： 김병휘 ,  박만용

IPC: H01S3/05 ,  H01S5/10

CPC classification number: H01S5/141 ,  G02B6/124 ,  G02B6/29316 ,  G02B6/29395 ,  G02B6/4215 ,  H01S3/1055 ,  H01S5/02248 ,  H01S5/02446 ,  H01S5/0287 ,  H01S5/0683

Abstract: A wavelength tunable external cavity laser is provided to have stable optical coupling efficiency and oscillation characteristics by coupling a wavelength tunable waveguide Bragg-grating reflection filter and a semiconductor laser diode through an active alignment method using an additional substrate. A semiconductor laser diode(200) outputs a multi-wavelength optical signal and is mounted on a first substrate. A wavelength tunable reflection filter(103) is mounted on a second substrate, and outputs a single-wavelength optical signal using resonance of a diffraction grating, and changes the wavelength of the single-wavelength optical signal by changing a refractive index of the diffraction grating. The first substrate is a 3-5 compound semiconductor substrate. The second substrate is a silicon substrate, and the tunable reflection filter is formed with a polymer material with a negative thermo-optic coefficient and has a waveguide structure.

Abstract translation: 通过使用附加衬底的主动对准方法，通过耦合波长可调波导布拉格光栅反射滤光器和半导体激光二极管，提供波长可调外腔激光器以具有稳定的光耦合效率和振荡特性。 半导体激光二极管（200）输出多波长光信号并安装在第一基板上。 波长可调谐反射滤光器（103）安装在第二基板上，并使用衍射光栅的谐振输出单波长光信号，并且通过改变衍射光栅的折射率来改变单波长光信号的波长 。 第一衬底是3-5化合物半导体衬底。 第二衬底是硅衬底，并且可调谐反射滤光器由具有负热光系数的聚合物材料形成并具有波导结构。