公开(公告)号：KR1020020054226A

公开(公告)日：2002-07-06

申请号：KR1020000083259

申请日：2000-12-27

Applicant: 한국전자통신연구원

Inventor： 김승관 ,  장순혁 ,  주무정 ,  이종현

IPC: G02B6/00

Abstract: PURPOSE: A device for compensating optical line for loss variation is provided to maximize a transport efficiency of total optical link by compensating for an optical line for a loss variation directly. CONSTITUTION: A pumping unit(408) generates a light of which a wavelength is shorter than a wavelength of an optical signal. An optical coupling unit(404) inputs the light generated in the pumping unit(408) into an optical line(402). An output fixing unit maintains constantly an intensity of an output optical signal of which a loss variation is compensated for by the pumping unit(408) and the optical coupling unit(404). The optical line(402) uses a Raman gain to compensate for the optical signal for the loss variation actively.

Abstract translation: 目的：提供一种用于补偿光线损耗变化的装置，以通过直接补偿光线损耗变化来最大限度地提高总光链路的传输效率。 构成：泵送单元（408）产生波长短于光信号的波长的光。 光耦合单元（404）将在泵送单元（408）中产生的光输入光线路（402）。 输出固定单元恒定地维持由泵送单元（408）和光耦合单元（404）补偿损耗变化的输出光信号的强度。 光线路（402）使用拉曼增益来主动地补偿光信号的损耗变化。

公开(公告)号：KR100440568B1

公开(公告)日：2004-07-21

申请号：KR1020010074724

申请日：2001-11-28

Applicant: 한국전자통신연구원

Inventor： 김승관 ,  장순혁 ,  주무정

IPC: H04B10/2507 ,  H04B10/2581

Abstract: PURPOSE: A broadband optical link control apparatus is provided to restrain amplification characteristics change of an optical repeater by compensating a loss change of an optical transmission line and a loss spectrum change. CONSTITUTION: Pump lasers(211,213) with the same wavelength are coupled through polarization couplers(215,217) to obtain a high output pumping light and a gain independent on polarization. Pumping light sources of each wavelength are coupled to one optical fiber through a pump WDM coupler(218) and made incident on an optical transmission light connected to an optical connector(201) through a pump/signal WDM coupler(202), and then, the transmitting optical fiber is induced to Raman scattering. An output strength of the optical signal from the optical connector(206) is fixed by a value determined by a reference voltage(306). That is, the optical signal branched through a monitoring optical coupler(205) is converted to an electric signal, that is, a voltage, in an optical detector(301), and a difference value between the converted voltage and the reference voltage(306) is outputted from an attenuator(304), passes through an integrator(305), and is inputted to a variable optical attenuator(204). The variable optical attenuator(204) controls an attenuation rate in proportion to an output voltage of the integrator(305), so that the output strength of the optical signal transmitted to the optical connector(206) has a fixed value. A portion of the optical signal output which has passed through the pump/signal WDM coupler(202), an optical separator(203) and the optical attenuator(204) is outputted through the monitoring optical coupler(205).

Abstract translation: 目的：提供一种宽带光链路控制装置，通过补偿光传输线路的损耗变化和损耗频谱变化来抑制光中继器的放大特性变化。 构成：具有相同波长的泵浦激光器（211,213）通过偏振耦合器（215,217）耦合以获得高输出泵浦光和与偏振无关的增益。 每个波长的泵浦光源通过泵浦WDM耦合器（218）耦合到一根光纤，并通过泵/信号WDM耦合器（202）入射到与光连接器（201）连接的光传输光上，然后， 传输光纤被诱导成拉曼散射。 来自光学连接器（206）的光信号的输出强度被由参考电压（306）确定的值固定。 即，通过监视用光耦合器（205）分支的光信号在光检测器（301）中被转换为电信号，即电压，转换电压与基准电压（306）之间的差分值 ）从衰减器（304）输出，通过积分器（305），并被输入到可变光衰减器（204）。 可变光衰减器（204）控制与积分器（305）的输出电压成比例的衰减率，使得传输到光连接器（206）的光信号的输出强度具有固定值。 已经通过泵/信号WDM耦合器（202），光分离器（203）和光衰减器（204）的一部分光信号输出通过监视光耦合器（205）输出。

公开(公告)号：KR1020040054109A

公开(公告)日：2004-06-25

申请号：KR1020020080826

申请日：2002-12-17

Applicant: 한국전자통신연구원

Inventor： 한진수 ,  이상수 ,  김승관 ,  주무정

IPC: H04J14/02

CPC classification number: H04J14/0227 ,  H04J14/02 ,  H04J14/0246 ,  H04J14/0279

Abstract: PURPOSE: A method for assigning channels of a WDM(Wavelength Division Multiplexing) optical transmission system having multi-transmission speed is provided to minimize the performance degradation due to raman crosstalk by assigning a low-speed channel and a high-speed channel to a long wavelength and a short wavelength, respectively. CONSTITUTION: A plurality of optical signals are received from a plurality of channels and the channel with the lowest transmission speed is selected from the remaining channels(S310). The selected channel is assigned to the longest wavelength band of the remaining bands(S320). The channel with the lowest transmission speed is selected from the remaining channels and the selected channel is assigned to the longest wavelength band of the remaining bands if there are the remaining channels(S330,S340).

Abstract translation: 目的：提供一种用于分配具有多传输速度的WDM（波分复用）​​光传输系统的信道的方法，以通过将低速信道和高速信道分配给长度来最小化由于拉曼串扰引起的性能劣化 波长和短波长。 构成：从多个通道接收多个光信号，从剩余的信道中选择具有最低传输速度的信道（S310）。 所选择的频道被分配给剩余频带的最长波段（S320）。 从剩余的信道中选择具有最低传输速度的信道，并且如果存在剩余信道，则所选频道被分配给剩余频带的最长波段（S330，S340）。

公开(公告)号：KR1020010055135A

公开(公告)日：2001-07-04

申请号：KR1019990056220

申请日：1999-12-09

Applicant: 한국전자통신연구원

Inventor： 김승관 ,  이동호 ,  김재근

IPC: H01S3/067

CPC classification number: H01S3/067 ,  G02B6/2766 ,  G02B6/29319 ,  G02B6/2935 ,  G02B6/29358 ,  G02B6/29391 ,  H01S3/06712 ,  H01S3/0675 ,  H01S3/06791 ,  H01S3/10023 ,  H01S3/1068 ,  H01S3/108 ,  H01S2301/04

Abstract: PURPOSE: A broadband multi-channel fiber-optic laser having equalized output is provided to supply broader bandwidth of multi-channels by expanding the oscillation channels of the laser through the expansion of the oscillation band region and equalizing the laser output of each channel. CONSTITUTION: The broadband multi-channel fiber-optic laser includes a gain medium unit(10), an oscillation unit(20) and a gain equalizing unit(30). In the laser, part of the light being generated by spontaneous emission off a gain medium(13) forms a guided mode. And the light proceeds to both directions. But the light passes through just one end by light dividers(21a,21b). And the passed light go through losses moving through an output coupler(22), a frequency changer(24a), a multi-channel filter(23b), and a polarization adjuster(25). The light again goes into the gain medium(13). The light is amplified by stimulated emission in the gain medium(13). The amplified light repeats the previous loss processing passing through the light divider(21a) to the polarization adjuster(25). The laser oscillation takes place when the gain of the light in the gain medium(13) and the loss generated at the laser, maintaining an equilibrium.

Abstract translation: 目的：提供具有均衡输出的宽带多通道光纤激光器，以通过扩展振荡频带区域扩展激光器的振荡通道并均衡每个通道的激光输出来提供更多的多通道带宽。 构成：宽带多通道光纤激光器包括增益介质单元（10），振荡单元（20）和增益均衡单元（30）。 在激光中，由增益介质（13）自发发射的一部分光形成导向模式。 灯光朝两个方向前进。 但光只通过分光器（21a，21b）仅通过一端。 并且通过的光穿过输出耦合器（22），变频器（24a），多通道滤波器（23b）和偏振调节器（25）的损耗。 光再次进入增益介质（13）。 通过增益介质（13）中的受激发射来放大光。 放大的光将通过分光器（21a）的先前的损失处理重复到偏振调节器（25）。 当增益介质（13）中的光的增益和激光产生的损耗保持平衡时，发生激光振荡。

公开(公告)号：KR100367085B1

公开(公告)日：2003-01-09

申请号：KR1020000083259

申请日：2000-12-27

Applicant: 한국전자통신연구원

Inventor： 김승관 ,  장순혁 ,  주무정 ,  이종현

IPC: G02B6/00

Abstract: PURPOSE: A device for compensating optical line for loss variation is provided to maximize a transport efficiency of total optical link by compensating for an optical line for a loss variation directly. CONSTITUTION: A pumping unit(408) generates a light of which a wavelength is shorter than a wavelength of an optical signal. An optical coupling unit(404) inputs the light generated in the pumping unit(408) into an optical line(402). An output fixing unit maintains constantly an intensity of an output optical signal of which a loss variation is compensated for by the pumping unit(408) and the optical coupling unit(404). The optical line(402) uses a Raman gain to compensate for the optical signal for the loss variation actively.

Abstract translation: 目的：提供一种用于补偿损耗变化的光线路的装置，以通过直接补偿光线路的损耗变化来最大化总光链路的传输效率。 构成：泵单元（408）产生波长比光信号的波长短的光。 光学耦合单元（404）将在泵浦单元（408）中产生的光输入到光学线路（402）中。 输出固定单元不断地保持由泵单元（408）和光耦合单元（404）补偿了损耗变化的输出光信号的强度。 光线（402）使用拉曼增益主动补偿损失变化的光信号。

公开(公告)号：KR1020010062972A

公开(公告)日：2001-07-09

申请号：KR1019990059758

申请日：1999-12-21

Applicant: 한국전자통신연구원

Inventor： 주무정 ,  김승관 ,  이동호

IPC: G02B6/00

Abstract: PURPOSE: A two wavelength optical fiber filter is provided to manufacture inexpensive laser with variable wavelength space by applying optical fiber-filter to laser resonator. CONSTITUTION: A fiber Bragg grating(FBG)(31) filter reflects the first wavelength as a multi-wavelength optical signal input/output unit, among the multi wavelength assigning reflection characteristic according to temperature and length. A band-pass filter(BPF)(32) permeates the second wavelength among the multi-wavelength. The BPF(32) is connected with the FBG(31) filter. A control unit controls intensity difference of the second wavelength selected by the BPF(32) and intensity of the first wavelength reflected from the FPG(31) filter. The control unit is connected with the BPF(32). A reflection unit(34) reflects the light of the second wavelength through the control unit and the BPF(32) in the direction of the multi-wavelength optical signal input/output unit. The reflection unit(34) is connected with the control unit.

Abstract translation: 目的：提供双波长光纤滤波器，通过将光纤滤波器应用于激光谐振器来制造具有可变波长空间的廉价激光器。 构成：根据温度和长度，多波长分配反射特性中的光纤布拉格光栅（FBG）（31）滤波器将第一波长反映为多波长光信号输入/输出单元。 带通滤波器（BPF）（32）渗透多波长中的第二波长。 BPF（32）与FBG（31）滤波器连接。 控制单元控制由BPF（32）选择的第二波长的强度差和从FPG（31）滤波器反射的第一波长的强度差。 控制单元与BPF（32）连接。 反射单元（34）通过控制单元和BPF（32）沿多波长光信号输入/输出单元的方向反射第二波长的光。 反射单元（34）与控制单元连接。

公开(公告)号：KR100496640B1

公开(公告)日：2005-06-20

申请号：KR1020020080826

申请日：2002-12-17

Applicant: 한국전자통신연구원

Inventor： 한진수 ,  이상수 ,  김승관 ,  주무정

IPC: H04J14/02

CPC classification number: H04J14/0227 ,  H04J14/02 ,  H04J14/0246 ,  H04J14/0279

Abstract: A channel allocation method of channels having different transmission speeds in a wavelength division multiplexing (WDM) system is provided. The channel allocation method in a multirate optical transmission system includes selecting a channel having the lowest transmission speed from not allotted channels, allotting the selected channel to the longest wavelength band of empty wavelength bands, and determining whether not allotted channels exist in order to repeatedly perform selecting the channel having the lowest transmission speed from the not allotted channels and allotting the selected channel to the longest wavelength band of the empty wavelength bands, until all the channels are allotted.

公开(公告)号：KR100462029B1

公开(公告)日：2004-12-18

申请号：KR1020030016113

申请日：2003-03-14

Applicant: 한국전자통신연구원

Inventor： 장순혁 ,  정희상 ,  한진수 ,  김승관 ,  이원경 ,  주무정

IPC: G02B6/00

CPC classification number: H04B10/296 ,  H01S3/06758 ,  H01S3/0941 ,  H01S3/10015 ,  H01S3/10069 ,  H01S3/1301 ,  H01S3/1305 ,  H01S3/1608 ,  H01S3/2375 ,  H01S3/302 ,  H01S2301/04 ,  H04B2210/003

Abstract: A method for realizing, in a fiber amplifier with three stages of amplifiers (100,200,300), automatic gain control (530) in which a constant gain is obtained when channels are varied, and automatic level control in which a constant output per channel is obtained when a light power is varied because of variations in span loss. A light power (L1) or another light power of a specific wavelength is monitored (520) to determine when variations in these light powers take place, current values of pump laser diodes appropriate for an input is read from a lookup table (540), and pump laser diodes are driven. During this operation, a pump power of the first stage amplifier (100) is constantly maintained, and those of the second or third stage amplifier are controlled (530).

Abstract translation: 一种用于在具有三级放大器（100,200,300）的光纤放大器中实现当在改变通道时获得恒定增益的自动增益控制（530）以及在通道被改变时获得每通道恒定输出的自动电平控制的方法 光功率因跨度损耗的变化而变化。 监视（520）光功率（L1）或特定波长的另一光功率以确定何时发生这些光功率的变化，从查找表（540）读取适合于输入的泵浦激光二极管的电流值， 并驱动泵浦激光二极管。 在此操作期间，第一级放大器（100）的泵功率被恒定地保持，并且第二或第三级放大器的泵功率被控制（530）。 ＆lt;图像＆GT;

公开(公告)号：KR1020040081586A

公开(公告)日：2004-09-22

申请号：KR1020030016113

申请日：2003-03-14

Applicant: 한국전자통신연구원

Inventor： 장순혁 ,  정희상 ,  한진수 ,  김승관 ,  이원경 ,  주무정

IPC: G02B6/00

CPC classification number: H04B10/296 ,  H01S3/06758 ,  H01S3/0941 ,  H01S3/10015 ,  H01S3/10069 ,  H01S3/1301 ,  H01S3/1305 ,  H01S3/1608 ,  H01S3/2375 ,  H01S3/302 ,  H01S2301/04 ,  H04B2210/003

Abstract: PURPOSE: An optical fiber amplifier and a fabricating method thereof are provided to form constantly each output of channels regardless of channel number and input power by using a simplified circuit. CONSTITUTION: A first stage amplifier(100) includes a first optical fiber and a first pump laser diode, and it amplifies an input optical signal. A second stage amplifier(200) includes a second optical fiber and a second pump laser diode, and, it receives the output of the first stage amplifier and generate a Raman gain. A third stage amplifier(300) includes a third optical fiber and a third pump laser diode, and it amplifies an output signal of the second stage amplifier by a predetermined gain. An automatic gain controller(500) is used for obtaining the predetermined gain by controlling the pump power of the second and the third pump laser diodes after fixing the pump beam of the first pump laser diode.

Abstract translation: 目的：提供一种光纤放大器及其制造方法，通过使用简化的电路，不管通道数量和输入功率如何，不断地形成每个通道的输出。 构成：第一级放大器（100）包括第一光纤和第一泵浦激光二极管，并且其放大输入光信号。 第二级放大器（200）包括第二光纤和第二泵激光二极管，并且其接收第一级放大器的输出并产生拉曼增益。 第三级放大器（300）包括第三光纤和第三泵激光二极管，并且以预定的增益放大第二级放大器的输出信号。 通过在固定第一泵浦激光二极管的泵浦光束之后控制第二和第三泵浦激光二极管的泵浦功率，使用自动增益控制器（500）来获得预定的增益。

公开(公告)号：KR100315421B1

公开(公告)日：2001-11-26

申请号：KR1019990059758

申请日：1999-12-21

Applicant: 한국전자통신연구원

Inventor： 주무정 ,  김승관 ,  이동호

IPC: G02B6/00

Abstract: 본발명은넓은영역의파장을조절할수 있으며손실이적고파장및 파장간격을용이하게가변시킬수 있는두파장광필터및 그를이용한레이저에관한것으로, 특정파장의빛을반사하는광학필터와임의의파장을투과시키는광학필터로이루어져파장간격이가변되는두 파장광섬유광학필터및 이를이용하여서로다른두개의파장을발진시키는동시에두개의발진파장간격을조절할수 있는두 파장레이저를제공한다. 본발명에따른광학필터는파장이고정되었거나또는좁은범위에서파장을가변시킬수 있는 FBG 필터와넓은범위에걸쳐투과파장을가변시킬수 있는필터및 파장의존성이없는반사수단으로이루어지며가변광 감쇄기를통해두 파장의상대적인세기를조절할수 있다. 또한, 이러한광섬유광학필터를레이저공진기에적용하여두개의파장에서출력을냄과동시에파장간격이가변되는레이저를구현할수 있다.