公开(公告)号：KR100454887B1

公开(公告)日：2004-11-06

申请号：KR1020020005326

申请日：2002-01-30

Applicant: 한국과학기술원

Inventor： 이창희 ,  오태원 ,  추광욱

IPC: H04B10/2581 ,  H04B10/2507

CPC classification number: H04J14/0297 ,  H04B10/032 ,  H04B10/2503 ,  H04B10/27 ,  H04B10/272 ,  H04B10/2939 ,  H04B10/2972 ,  H04J14/02 ,  H04J14/0282

Abstract: The present invention relates to a wavelength-division multiplexed passive optical network. In particular, it relates to a technology for minimizing the optical loss at a wavelength-division multiplexed passive optical network based on wavelength-locked light source Thereby it improves the transmission quality and increases the transmission distance. A 4-port optical path setting device of the present invention increases the amount of light injected into an optical transmitter and thereby improves the wavelength-locking characteristic of a light source. In addition, it can decrease the optical transmission loss in an optical transmission path, and by an optical amplifier being inserted therein; it can also compensate the optical loss in an optical transmission path. In the present invention, a 4-port optical path setting device having the characteristics described above and a method for fault recovery without an additional optical loss are presented.

Abstract translation: 波分复用无源光网络技术领域本发明涉及一种波分复用无源光网络。 尤其涉及一种用于使基于波长锁定光源的波分复用无源光网络中的光损失最小化的技术。由此，提高了传输质量并增加了传输距离。 本发明的4端口光路设置装置增加了注入光发送器的光量，从而提高了光源的波长锁定特性。 另外，它可以降低光传输路径中的光传输损耗，并且通过插入光放大器; 它也可以补偿光传输路径中的光损耗。 在本发明中，提出了具有上述特征的4端口光路设置装置和用于故障恢复而没有附加光损耗的方法。

公开(公告)号：KR100387288B1

公开(公告)日：2003-06-18

申请号：KR1020010002468

申请日：2001-01-16

Applicant: 한국과학기술원

Inventor： 이창희 ,  추광욱 ,  이상묵

IPC: H04B10/07 ,  H04B10/2581

Abstract: PURPOSE: An apparatus for measuring a wavelength of an optical signal, an optical strength and an optical signal-to-noise ratio in a wavelength division multiplexing optical communication is provided to heighten an accuracy in measuring an optical strength and optical signal-to-noise ratio by measuring them by using a signal-band reflection optical filter. CONSTITUTION: An optical amplifier(502) receives a wavelength division-multiplexed optical signal, amplifies it and outputs it together with a spontaneous emission light. As a band pass optical variable filter(506), a Fabry-Perot variable filter, an integrated optical device containing grid, a multi-layer thin film device, or an acousto-optic filter may be adopted. An optical circulator(508) includes three input/output terminals, of which input and output correspond clockwise. That is, when a light is inputted to an arbitrary terminal, it is output to the next terminal clockwise. An optical fiber Bragg grids(510,512) reflect a light corresponding to a grid period and pass a light of the remaining wavelength. In addition, the optical fiber Bragg grids(510,512) reflect only a particular wavelength component of the spontaneous emission light and outputs a spontaneous emission light discrimination signal.

Abstract translation: 目的：提供一种在波分复用光通信中测量光信号的波长，光强度和光信噪比的装置，以提高测量光强度和光信噪比的准确性 通过使用信号带反射光学滤波器来测量它们。 构成：光放大器（502）接收波分复用光信号，将其放大并与自发发射光一起输出。 作为带通光学可变滤波器（506），可以采用法布里 - 珀罗可变滤波器，包含网格的集成光学器件，多层薄膜器件或声光滤波器。 光环行器（508）包括三个输入/输出端子，其输入和输出顺时针对应。 也就是说，当光输入到任意端子时，它顺时针输出到下一个端子。 光纤布拉格栅格（510,512）反射对应于栅格周期的光并通过剩余波长的光。 另外，光纤布拉格光栅（510,512）仅反射自发发射光的特定波长分量并输出自发发射光鉴别信号。

公开(公告)号：KR100301950B1

公开(公告)日：2001-10-29

申请号：KR1019990011547

申请日：1999-04-02

Applicant: 한국과학기술원

Inventor： 이창희 ,  신상영 ,  추광욱

IPC: H04B10/07 ,  H04B10/25

CPC classification number: H04B10/0773 ,  H04B10/0771 ,  H04B2210/075 ,  H04J14/0221 ,  H04J14/0227 ,  H04J14/0241 ,  H04J14/0276 ,  H04J14/0298 ,  H04Q11/0005 ,  H04Q2011/0049 ,  H04Q2011/0083

Abstract: 본발명은광 경로(optical path) 감시장치에관한것으로, 더욱상세하게는광 회선분배시스템의입력단자판별을통하여광 경로를감시할수 있도록하는광 회선분배시스템입력단자판별에의한광 경로감시장치를제공하는데 그목적이있다. 본발명에따르면, 파장분할다중된광신호를입력받는입력단자, 파장역다중장치, 광스위칭장치, 스위칭제어장치, 광스위칭장치로부터입력된광신호들의광세기의편차를줄여출력하는광 경로의존손실보상장치, 파장다중장치와파장분할다중된광신호를출력하는출력단자를구비하고있는광 회선분배시스템에적용되는광 경로감시장치에있어서, 상기입력단자를통하여입력된파장분할다중된광신호에외부로부터입력받은저속의파일럿톤을합성하기위한다수개의파일럿톤 합성장치와, 상기광 스위칭장치의각각의출력단자에접속되어, 상기광 스위칭장치로부터입력된광신호를분기시키기위한다수개의광 분기장치및 상기광 분기장치로부터분기된광신호를입력받아파일럿톤을추출하여광신호가입력된광 회선분배시스템의입력단자를판별한후에, 상기스위칭제어장치로부터입력받은라우팅정보를이용하여광 경로오류를검출하여출력하기위한파일럿톤 검출장치를포함하여이루어지며, 상기광 경로의존손실보상장치의반응시간이상기파일럿톤 합성장치에의해광신호에합성된파일럿톤까지없애기에충분히짧은것이특징인광 경로감시장치가제공된다.

公开(公告)号：KR1020010018530A

公开(公告)日：2001-03-05

申请号：KR1019990034512

申请日：1999-08-20

Applicant: 한국과학기술원

Inventor： 이창희 ,  신상영 ,  추광욱

IPC: G01J1/26

CPC classification number: G01J1/26 ,  G01J1/44 ,  G01J2001/446 ,  H04J14/0213

Abstract: PURPOSE: A measurer of a wavelength divided multiple optical communication is provided to measure the wavelength of an optical signal, optical intensity and an OSNR(optical signal-to-ratio) using natural emitted light distinguishing signal and a band passing optical various filter. CONSTITUTION: A measurer of a wavelength dividing multiple optical communication consists of a branch device branching one part of a wavelength dividing multiple optical signal; a natural emitted light source(507); a reflector outputting a natural emitted light distinguishing signal; a band passing optical various filter(503) outputting an optical spectrum curve; a converter converting the optical spectrum curve to an electric signal; and a signal processor calculating the wavelength, the intensity and the OSNR of the wavelength divided multiple optical signal from the electric signal.

Abstract translation: 目的：提供波长分割多光通信的测量器，以使用自然发射光识别信号和通过光学各种滤波器的带通测量光信号的波长，光强度和OSNR（光信号对比）。 构成：波长分割多光通信的测量器由分支多个光信号的波长分割的一部分的分支设备组成; 自然发射光源（507）; 输出自然发光识别信号的反射器; 输出光谱曲线的带通光学各种滤光器（503）; 将光谱曲线转换成电信号的转换器; 以及信号处理器，从电信号计算波长分割多个光信号的波长，强度和OSNR。

公开(公告)号：KR1020000060364A

公开(公告)日：2000-10-16

申请号：KR1019990008593

申请日：1999-03-15

Applicant: 한국과학기술원

Inventor： 이창희 ,  신상영 ,  추광욱

IPC: H04B10/07 ,  H04B10/2581

CPC classification number: H04B10/07953 ,  H04B10/07957 ,  H04J14/02

Abstract: PURPOSE: An apparatus for measuring a wave length of an optical signal having a multiplexed wave length division and an optical intensity and an optical signal-to-noise is provided for measuring a wavelength and optical intensity of a wavelength division multiplexed optical signal and an optical signal-to-noise ratio in a wavelength division multiplexed method. CONSTITUTION: An apparatus includes two 2x1 optical couplers(503, 504), one 1x2 optical coupler(501), two optical fiber brag gratings(504, 505), an optical isolator(511), a bandwidth pass optical variation filter(507, an optical diode(508), a signal processor(510), an optical amplifier(502), and a control signal generator(509). The optical fiber gratings(504, 505) reflect an optical signal of a wavelength corresponds to a grating period and transmit the optical signals of the remaining wavelengths.

Abstract translation: 目的：提供一种用于测量具有复用波长分割，光强度和光信号对噪声的光信号的波长的装置，用于测量波分复用光信号和光分路器的波长和光强度 波分复用方法中的信噪比。 构成：装置包括两个2x1光耦合器（503,504），一个1x2光耦合器（501），两个光纤布拉格光栅（504,505），光隔离器（511），带通通过光变差滤波器 光电二极管（508），信号处理器（510），光放大器（502）和控制信号发生器（509）。光纤光栅（504,505）反射波长的光信号对应于光栅 并传输剩余波长的光信号。

公开(公告)号：KR1020020061412A

公开(公告)日：2002-07-24

申请号：KR1020010002468

申请日：2001-01-16

Applicant: 한국과학기술원

Inventor： 이창희 ,  추광욱 ,  이상묵

IPC: H04B10/07 ,  H04B10/2581

CPC classification number: H04B10/07957 ,  H04B10/07953 ,  H04J14/0227

Abstract: PURPOSE: An apparatus for measuring a wavelength of an optical signal, an optical strength and an optical signal-to-noise ratio in a wavelength division multiplexing optical communication is provided to heighten an accuracy in measuring an optical strength and optical signal-to-noise ratio by measuring them by using a signal-band reflection optical filter. CONSTITUTION: An optical amplifier(502) receives a wavelength division-multiplexed optical signal, amplifies it and outputs it together with a spontaneous emission light. As a band pass optical variable filter(506), a Fabry-Perot variable filter, an integrated optical device containing grid, a multi-layer thin film device, or an acousto-optic filter may be adopted. An optical circulator(508) includes three input/output terminals, of which input and output correspond clockwise. That is, when a light is inputted to an arbitrary terminal, it is output to the next terminal clockwise. An optical fiber Bragg grids(510,512) reflect a light corresponding to a grid period and pass a light of the remaining wavelength. In addition, the optical fiber Bragg grids(510,512) reflect only a particular wavelength component of the spontaneous emission light and outputs a spontaneous emission light discrimination signal.

Abstract translation: 目的：提供一种用于测量波分复用光通信中的光信号波长，光强度和光信噪比的装置，以提高测量光强度和光信号对噪声的精度 通过使用信号带反射光学滤波器测量它们。 构成：光放大器（502）接收波分复用光信号，将其放大并与自发发射光一起输出。 作为带通光学可变滤波器（506），可以采用Fabry-Perot可变滤波器，包含栅格的集成光学器件，多层薄膜器件或声光滤波器。 光循环器（508）包括三个输入/输出端子，其输入和输出顺时针对应。 也就是说，当将光输入到任意端子时，它顺时针输出到下一个端子。 光纤布拉格网格（510,512）反射对应于网格周期的光并通过剩余波长的光。 此外，光纤布拉格栅（510,512）仅反射自发发射光的特定波长分量，并输出自发发光识别信号。

公开(公告)号：KR100342428B1

公开(公告)日：2002-07-03

申请号：KR1020000058298

申请日：2000-10-04

Applicant: 한국과학기술원

Inventor： 이창희 ,  신상영 ,  추광욱

IPC: H04B10/07

Abstract: 본 발명은 광통신에서 광신호의 광 신호 대 잡음비를 측정할 때, 대역통과 광 가변필터의 파장에 따른 투과특성에 의한 측정오차를 감소시키는 장치 및 방법에 관한 것이다.
종래의 대역통과 광 가변필터와 광 검출기를 이용한 광신호의 광 신호 대 잡음비 측정은 파장에 따른 투과특성이 좋지 않기 때문에, 필연적으로 측정오차가 발생하는 반면에 본 발명은 디지털 전기신호를 아날로그 전기신호로 변환하는 디지털-아날로그 변환수단, 상기 변환된 아날로그 전기신호의 주파수대역을 제한하는 저역통과 필터, 상기 아날로그 전기신호에 따라 최고점 투과파장이 변하는 대역통과 광 가변필터, 상기 대역통과 광 가변필터의 동작온도를 고정하는 자동 온도 조절기, 상기 대역통과 광 가변필터를 투과한 광의 세기를 아날로그 전기신호로 변환하는 광 검출기, 상기 광 검출기에서 전송된 아날로그 전기신호를 샘플링하여 디지털 전기신호로 변환하는 아날로그-디지털 변환수단 및 상기 아날로그-디지털 변환수단에 의해 변환된 디지털 신호로부터 광신호의 광 신호 대 잡음비를 측정하는 신호처리기를 제시하여 측정오차를 감소시키는 장치 및 방법을 제시한다.

公开(公告)号：KR1020020027060A

公开(公告)日：2002-04-13

申请号：KR1020000058298

申请日：2000-10-04

Applicant: 한국과학기술원

Inventor： 이창희 ,  신상영 ,  추광욱

IPC: H04B10/07

CPC classification number: H04B10/077 ,  H04B10/07957

Abstract: PURPOSE: A device and a method for reducing a measurement error by a transmission characteristic according to wavelength of a band pass optical variable filter, when measuring an optical signal to noise ratio of an optical signal in optical communication, are provided to maximumly reduce the measurement error caused by a bad transmission characteristic, so that the performance of a WDM(Wavelength Division Multiplexing) optical transmission system can be monitored. CONSTITUTION: A D/A(Digital-to-Analog) converter(200) converts digital electric signals into analog electric signals to control a peak transmission wavelength of a band pass optical variable filter(300). A low pass filter(100) limits a frequency band of the converted analog electric signals. The band pass optical variable filter(300) in which the peak transmission wavelength is changed according to the analog electric signals. An automatic temperature regulator(700) fixes an operating temperature of the band pass optical variable filter(300). An optical detector(400) converts the strength of light transmitting the band pass optical variable filter(300) into analog electric signals. An A/D(Analog-to-Digital) converter(500) samples the analog electric signals transmitted from the optical detector(400) at a given cycle, to convert the sampled analog electric signals into digital electric signals. And a signal processor(600) measures an optical signal to noise ratio of optical signals using the converted digital electric signals.

Abstract translation: 目的：提供一种在光通信中测量光信号的光信噪比时，根据带通光可变滤波器的波长通过传输特性降低测量误差的装置和方法，以最大限度地减少测量 错误的传输特性引起的错误，从而可以监视WDM（波分复用）​​光传输系统的性能。 构成：数模转换器（200）将数字电信号转换成模拟电信号，以控制带通光可变滤波器（300）的峰值传输波长。 低通滤波器（100）限制转换的模拟电信号的频带。 带通光学可变滤波器（300），其中峰值透射波长根据模拟电信号而改变。 自动温度调节器（700）固定带通光学可变过滤器（300）的工作温度。 光检测器（400）将透过带通光可变滤波器（300）的光的强度转换为模拟电信号。 A / D（模拟到数字）转换器（500）以给定的周期对从光学检测器（400）发送的模拟电信号进行采样，以将采样的模拟电信号转换成数字电信号。 并且信号处理器（600）使用转换的数字电信号测量光信号的光信噪比。

公开(公告)号：KR1020010037296A

公开(公告)日：2001-05-07

申请号：KR1019990044723

申请日：1999-10-15

Applicant: 한국과학기술원

Inventor： 이창희 ,  신상영 ,  추광욱

IPC: H04B10/07 ,  H04B10/291

CPC classification number: H04B10/077 ,  G01J4/04 ,  H04B10/07955

Abstract: PURPOSE: A device and a method for measuring an optical signal-to-noise ratio are provided to measure a Stokes' parameter of an output light of an optical amplifier, so as to measure the optical signal-to-noise ratio. CONSTITUTION: A band pass optical variable filter(701) passes an output light coincident with a transmission wavelength, if the output light of an optical amplifier is inputted. A 1-by-4 optical divider(702) divides the light passed the band pass optical variable filter(701) into four. Stokes parameter measuring units(703,704,705,706,707) calculates the Stokes' parameters which are S0,S1,S2 and S3 from the divided four light. An optical light strength measuring unit measures the strength of polarized components among output light of the optical amplifier from the Stokes' parameters of S0,S1,S2 and S3. A noise strength measuring unit calculates the noise strength included in the output light of the optical amplifier by using the Stokes' parameter of S0 and the strength of the optical signal. A dividing unit(721) calculates an optical signal strength-to-noise strength ratio for a transmission wavelength, by using the optical signal strength and the noise strength. The optical signal strength-to-noise strength ratios in each wavelength are measured while varying the transmission wavelength of the band pass optical variable filter(701). A peak of the measured strength-to-noise strength ratios is searched, and set up as an optical signal-to-noise ratio.

Abstract translation: 目的：提供一种用于测量光信噪比的装置和方法，以测量光放大器的输出光的斯托克斯参数，以便测量光信噪比。 构成：如果输入光放大器的输出光，则带通光学可变滤波器（701）通过与透射波长一致的输出光。 1/4分频器（702）将通过光通滤光器（701）的光分成四个。 斯托克斯参数测量单元（703,704,705,706,707）从划分的四个光线计算出S0，S1，S2和S3的斯托克斯参数。 光强度测量单元从S0，S1，S2和S3的斯托克斯参数测量光放大器的输出光中的偏振分量的强度。 噪声强度测量单元通过使用S0的斯托克斯参数和光信号的强度来计算包括在光放大器的输出光中的噪声强度。 分割单元（721）通过使用光信号强度和噪声强度来计算透射波长的光信号强度 - 噪声强度比。 在改变带通光可变滤波器（701）的透射波长的同时测量每个波长中的光信号强度 - 噪声强度比。 搜索测得的强度 - 噪声强度比的峰值，并将其设置为光信噪比。

公开(公告)号：KR1020030065632A

公开(公告)日：2003-08-09

申请号：KR1020020005326

申请日：2002-01-30

Applicant: 한국과학기술원

Inventor： 이창희 ,  오태원 ,  추광욱

IPC: H04B10/2581 ,  H04B10/2507

CPC classification number: H04J14/0297 ,  H04B10/032 ,  H04B10/2503 ,  H04B10/27 ,  H04B10/272 ,  H04B10/2939 ,  H04B10/2972 ,  H04J14/02 ,  H04J14/0282

Abstract: PURPOSE: A method and apparatus for reducing and compensating transmission of a WDM(Wavelength Division Multiplex) passive optical network are provided to enhance a transmission quality and a transmission distance by minimizing an optical loss. CONSTITUTION: A central base station includes 2xN optical wavelength multiplexing/demultiplexing unit(610), 1x2 space optical switches(614,615) and a four-terminal optical path setting unit(613). An optical cable(616) connects the central base station and a remote distribution node in a normal state. An optical cable2(617) serves as a bypass in case of restoration of failure. 2xN optical wavelength multiplexing/demultiplexing unit(618) is provided in the remote distribution node. The 1x2 space optical switch(614). Connects one of two terminals of the 2xN optical wavelength multiplexing/demultiplexing unit(610) and the four-terminal optical path setting unit(613). The 1x2 space optical switch(615) connects one of the optical cable1(616) and the optical cable2(617) and the 4-terminal optical path setting unit(613). The 2xN optical multiplexing/demultiplexing units(610,618) are an optical device using an integrated optical technique, a micro optical technique and an optical fiber technique.

Abstract translation: 目的：提供一种用于减少和补偿WDM（波分复用）​​无源光网络传输的方法和装置，以通过最小化光损耗来增强传输质量和传输距离。 构成：中央基站包括2xN光波分复用/解复用单元（610），1x2空间光开关（614,615）和四端光路设置单元（613）。 光缆（616）以正常状态连接中央基站和远程分配节点。 在恢复故障的情况下，光缆2（617）用作旁路。 在远程分配节点中提供2xN光波分复用/解复用单元（618）。 1x2空间光开关（614）。 连接2xN光波分复用/解复用单元（610）和四端光路设置单元（613）的两个端子之一。 1x2空间光开关（615）连接光缆1（616）和光缆2（617）之一以及4端子光路设定单元（613）。 2xN光复用/解复用单元（610,618）是使用集成光学技术，微光学技术和光纤技术的光学器件。