公开(公告)号：US06441944B1

公开(公告)日：2002-08-27

申请号：US09208018

申请日：1998-12-09

申请人： Sung-jun Kim ,  Seong-taek Hwang ,  Soo-young Yoon ,  Jeong-mee Kim

发明人： Sung-jun Kim ,  Seong-taek Hwang ,  Soo-young Yoon ,  Jeong-mee Kim

IPC分类号： G02F109

CPC分类号： G02F1/09 ,  G02F1/093

摘要： An optical attenuator using an isolator, and an optical communications system including the same, function to control the intensity of an input optical signal. The isolator comprises a Faraday rotator in which a rotation angle of polarization varies depending on the intensity of an applied magnetic field. As a result, the level of isolation of an optical signal changes in accordance with the rotation angle of polarization and an attenuated optical signal is outputted. A magnetic field generator generates a magnetic field having an intensity which is controlled by the intensity of current, and the generated magnetic field is applied to the isolator A power supply supplies current to the magnetic field generator and controls the intensity of the current. A magnetic core and a coil are installed on the optical isolator, and currents applied to the coil are controlled to adjust the intensity of the magnetic field which is formed on the isolator. Accordingly isolation of an optical signal is controlled, and the optical signal is attenuated. The optical attenuator is easily mounted on the system because of its small size, and can change the level of attenuation by controlling only the intensity of current.

摘要翻译： 使用隔离器的光衰减器和包括该隔离器的光通信系统的功能是控制输入光信号的强度。 隔离器包括法拉第旋转器，其中旋转偏振角根据施加的磁场的强度而变化。 结果，光信号的隔离度根据偏振旋转角度而变化，输出衰减的光信号。 磁场发生器产生具有由电流强度控制的强度的磁场，并且所产生的磁场被施加到隔离器A电源向磁场发生器提供电流并控制电流的强度。 在光隔离器上安装磁芯和线圈，并且控制施加到线圈的电流，以调节隔离器上形成的磁场的强度。 因此，控制光信号的隔离，并且光信号被衰减。 光衰减器由于尺寸小而容易安装在系统上，并且可以通过仅控制电流强度来改变衰减水平。

公开(公告)号：US06392788B1

公开(公告)日：2002-05-21

申请号：US09196765

申请日：1998-11-20

申请人： Soo-young Yoon ,  Seong-taek Hwang ,  Lars Johan Albinsson Nilsson ,  Jeong-mee Kim ,  Sung-jun Kim ,  Rae-sung Jung

发明人： Soo-young Yoon ,  Seong-taek Hwang ,  Lars Johan Albinsson Nilsson ,  Jeong-mee Kim ,  Sung-jun Kim ,  Rae-sung Jung

IPC分类号： H01S300

CPC分类号： H04B10/2912 ,  H01S3/06758 ,  H01S3/06787 ,  H01S3/1608 ,  H01S3/1691 ,  H01S3/1693 ,  H01S2301/04 ,  H04B10/291 ,  H04B10/294

摘要： An optical fiber amplifier including a first optical fiber doped with erbium and phosphorous, for amplifying signal light excited by the erbium, a second optical fiber connected to one end of the first optical fiber, doped with erbium and aluminum, and having a gain spectrum slope opposite to the first optical fiber according to population inversion of the erbium, for amplifying signal light output by the first optical fiber, a pumping laser source connected to another end of the first optical fiber, for exciting the erbium of the first and second optical fibers, and a light coupler for coupling pumping light from the pumping laser source to the signal light and outputting the resultant light to the first optical fiber. Two types of EDFs (erbium doped fibers) having different gain spectrums are used, such that the gain spectrum of each of the EDFs actively varies with the input signal light power or pumping light power. Thus, an entirely flat gain is kept.

摘要翻译： 一种光纤放大器，包括掺杂有铒和磷的第一光纤，用于放大由铒激发的信号光;第二光纤，连接到第一光纤的一端，掺杂有铒和铝，并具有增益谱斜率 与第一光纤相对的根据铒的群体反转，用于放大由第一光纤输出的信号光，连接到第一光纤的另一端的激光源，用于激发第一和第二光纤的铒 以及用于将来自所述泵浦激光源的泵浦光耦合到所述信号光并将所得光输出到所述第一光纤的光耦合器。 使用具有不同增益光谱的两种类型的EDF（掺铒光纤），使得每个EDF的增益谱随输入信号光功率或泵浦光功率而变化。 因此，保持完全平坦的增益。

公开(公告)号：US06353496B1

公开(公告)日：2002-03-05

申请号：US09413798

申请日：1999-10-07

申请人： Rae-sung Jung ,  Seong-taek Hwang ,  Jeong-mee Kim

发明人： Rae-sung Jung ,  Seong-taek Hwang ,  Jeong-mee Kim

IPC分类号： H01S300

CPC分类号： H04B10/296 ,  H01S3/067 ,  H01S3/1312

摘要： A wavelength division multiplexing erbium doped fiber amplifier (WDM-EDFA) which outputs constant power per channel, and an amplification method thereof, are provided. The WDM-EDFA for amplifying received signal light of a plurality of channels which are multiplexed, includes a power control unit for generating dummy light whose output power is controlled according to a first control value, and controlling the power of received signal light by coupling the dummy light to the received signal light, an optical fiber amplification unit for amplifying signal light power-controlled by the power control unit, using pumping light generated according to a second control value, and a controller for supplying the first control value to the power control unit to obtain dummy light power corresponding to the difference between the power value of the received signal light and a predetermined target power value, and supplying the second control value to the optical fiber amplification unit to obtain pumping light power required to amplify the received signal light. Thus, a transient effect of the WDM-EDFAs, in which a plurality of channels are multiplexed and amplified, can be eliminated by controlling the power of incident signal light of added/dropped channels.

摘要翻译： 提供了输出每通道恒定功率的波分复用掺铒光纤放大器（WDM-EDFA）及其放大方法。 用于放大被多路复用的多个信道的接收信号光的WDM-EDFA包括：功率控制单元，用于产生根据第一控制值来控制其输出功率的虚拟光，并通过耦合接收信号光来控制接收信号光的功率 对接收到的信号光进行伪光;光纤放大单元，用于使用根据第二控制值产生的泵浦光放大由功率控制单元进行功率控制的信号光;以及控制器，用于将第一控制值提供给功率控制 单元，以获得与接收信号光的功率值和预定目标功率值之间的差异相对应的虚拟光功率，并将第二控制值提供给光纤放大单元，以获得放大接收信号光所需的泵浦光功率 。 因此，可以通过控制添加/丢弃的信道的入射信号光的功率来消除多路复用和放大的WDM-EDFA的瞬态效应。

公开(公告)号：US06452703B1

公开(公告)日：2002-09-17

申请号：US09365249

申请日：1999-07-30

申请人： Sung-jun Kim ,  Jeong-mee Kim

发明人： Sung-jun Kim ,  Jeong-mee Kim

IPC分类号： H04J1402

CPC分类号： H04Q11/0005 ,  H04J14/0206 ,  H04J14/0209 ,  H04J14/0213 ,  H04Q2011/0016 ,  H04Q2011/0092

摘要： An optical add-drop multiplexer (OADM) for adding and dropping wavelength groups for each node among multiplexed and input wavelength groups includes: a wavelength group demultiplexer for separating a plurality of input channels into groups of channels and dropping a channel group required for the node and passing the other groups of channels therethrough; a channel selector for selecting channels from the wavelength group output from the wavelength group demultiplexer and transmitting the selected channels to the area; a channel multiplexer for multiplexing the channels having the same wavelengths as those of the selected channels and input from the area into the wavelength group, and a wavelength group multiplexer for adding the wavelength group input from the channel multiplexer to the wavelength groups that have passed through the wavelength group demultiplexer. Wavelengths required for each node are set to a wavelength group, thereby reducing the time necessary in extending channel capacity or wavelengths in each node. Also, since only a channel selector is additionally installed in an OADM for wavelength extension, wavelength extension is facilitated and a WDM system can be constructed at a low cost. Such an OADM may be used in a wavelength division multiplexing (WDM) optical link.

摘要翻译： 一种用于在多路复用和输入波长组中为每个节点添加和删除波长组的光分插复用器（OADM）包括：波长组解复用器，用于将多个输入信道分离成多个信道组，并丢弃节点所需的信道组 并通过其他通道组; 频道选择器，用于从波长组解复用器输出的波长组中选择频道，并将选择的频道发送到该区域; 用于复用与所选择的信道具有相同波长的信道并从该区域输入到波长组中的信道的信道多路复用器，以及用于将从信道多路复用器输入的波长组加到已经通过的波长组的波长组多路复用器 波长组解复用器。 将每个节点所需的波长设置为波长组，从而减少扩展每个节点中的信道容量或波长所需的时间。 此外，由于在用于波长扩展的OADM中仅附加通道选择器，因此便于波长扩展，并且可以以低成本构建WDM系统。 这种OADM可以用在波分复用（WDM）光链路中。

公开(公告)号：US5995277A

公开(公告)日：1999-11-30

申请号：US106355

申请日：1998-06-29

申请人： Jeong-mee Kim ,  Sung-jun Kim

发明人： Jeong-mee Kim ,  Sung-jun Kim

IPC分类号： G02B5/22 ,  G02B6/00 ,  H01S3/06 ,  H01S3/067 ,  H01S3/10 ,  H01S3/30 ,  G02F1/35 ,  H01S3/07

CPC分类号： H04B10/2912 ,  H01S3/06758 ,  H04B10/291 ,  H04B2210/003

摘要： An optical fiber amplifier with an absorber, including a first amplification unit for amplifying an input signal light, using first pump light; an absorption unit for separating the signal light and the pump light from the output light of the first amplification unit and absorbing a light signal in a wavelength range; and a second amplification unit for amplifying the signal light output by the absorption unit, using second pump light. The optical fiber amplifier can be easily manufactured by adding an absorber, an erbium doped fiber, to a conventional optical fiber amplifier. The characteristics of the optical fiber amplifier can be easily changed by controlling the length of the absorber.

摘要翻译： 一种具有吸收体的光纤放大器，包括：第一放大单元，用于使用第一泵浦光放大输入信号光; 吸收单元，用于从第一放大单元的输出光分离信号光和泵浦光，并吸收波长范围内的光信号; 以及第二放大单元，用于使用第二泵浦光来放大由吸收单元输出的信号光。 通过向传统的光纤放大器添加吸收体（掺铒光纤），可以容易地制造光纤放大器。 通过控制吸收体的长度可以容易地改变光纤放大器的特性。

公开(公告)号：US06201637B1

公开(公告)日：2001-03-13

申请号：US09366560

申请日：1999-08-04

申请人： Johan Nilsson ,  Jeong-mee Kim ,  Sung-jun Kim

发明人： Johan Nilsson ,  Jeong-mee Kim ,  Sung-jun Kim

IPC分类号： H01S313

CPC分类号： H04B10/291 ,  H01S3/094003 ,  H01S3/094023 ,  H01S3/10023

摘要： An long-wavelength optical fiber amplifier includes an erbium doped optical fiber (EDF) for amplifying an input signal light having a wavelength in the range of 1580 nanometers (nm) using pump light, a pumping unit positioned in front of and to the rear of the erbium doped optical fiber, for supplying the pump light to the erbium doped optical fiber, and an amplified spontaneous emission (ASE) reflecting unit positioned in front of the pumping unit, for coupling backward amplified spontaneous emission generated in the erbium doped optical fiber to the long-wavelength input signal light and inputting again the same to the erbium doped optical fiber. Fewer laser diodes and optical devices are necessary in amplifying an signal light having a long wavelength, by providing a reflector for reflecting amplified spontaneous emission. Also, the gain is increased in the case when the power of an input signal is small.

摘要翻译： 长波长光纤放大器包括掺铒光纤（EDF），用于使用泵浦光放大具有在1580nm（nm）范围内的波长的输入信号光;泵送单元位于 用于向掺铒光纤提供泵浦光的铒掺杂光纤和位于泵送单元前面的放大的自发发射（ASE）反射单元，用于将在掺铒光纤中产生的反向放大的自发发射耦合到 长波长输入信号光并再次输入到掺铒光纤。 通过提供用于反射放大的自发发射的反射器，在放大具有长波长的信号光时需要较少的激光二极管和光学装置。 此外，在输入信号的功率小的情况下，增益增加。

公开(公告)号：US6094514A

公开(公告)日：2000-07-25

申请号：US133371

申请日：1998-08-13

申请人： Jeong-mee Kim

发明人： Jeong-mee Kim

IPC分类号： G01M11/00 ,  H01S3/00 ,  H01S3/067 ,  H03G3/00 ,  G02B6/28 ,  G02B6/35

CPC分类号： H04B10/0731 ,  H01S3/0014 ,  H01S3/06754

摘要： A gain measuring apparatus of a multi-channel optical fiber amplifier for amplifying an input multi-channel optical signal of a predetermined wavelength range includes a plurality of optical signal sources for generating an optical signal, the number of optical signal sources being less than the number of channels of the multi-channel optical signal, in a wavelength range of the multi-channel optical signal, a probe optical signal source for generating a probe signal of a wavelength of which gain is subject to measurement, an optical multiplexer for multiplexing optical signals output from the optical signal sources and the probe optical signal source, an optical amplification portion for splitting the optical signals multiplexed by the optical multiplexer in an equal ratio and passing one optical signal of the split optical signal with amplification and the other optical signal of the split optical signal without amplification, and a measuring system for respectively measuring intensities of the amplified probe optical signal at the optical amplification portion and the probe optical signal that is not amplified at the optical amplification portion. When the gain of multi-channel erbium doped fiber amplifier is measured, the signal gain of each channel can be accurately measured using less optical signal sources than the number of light sources corresponding to each channel.

摘要翻译： 用于放大预定波长范围的输入多通道光信号的多通道光纤放大器的增益测量装置包括用于产生光信号的多个光信号源，光信号源的数量小于数字 在多信道光信号的波长范围内的多通道光信号的通道，用于产生增益被测量的波长的探测信号的探测光信号源，用于复用光信号的光复用器 从光信号源和探测光信号源输出的光放大部分，用于将由光复用器多路复用的光信号以相等的比例分离，并通过放大将分裂光信号的一个光信号通过，另一个光信号 没有放大的分裂光信号，以及用于分别测量强度的测量系统 在光放大部分放大的探测光信号的关系和在光放大部分未被放大的探测光信号。 当测量多通道掺铒光纤放大器的增益时，可以使用比每个通道对应的光源数量更少的光信号源来精确测量每个通道的信号增益。

公开(公告)号：US06297901B1

公开(公告)日：2001-10-02

申请号：US09482532

申请日：2000-01-14

申请人： Jeong-mee Kim

发明人： Jeong-mee Kim

IPC分类号： G02F109

CPC分类号： G02F1/093 ,  G02F1/01 ,  G02F2203/48

摘要： An optical attenuating isolator obtained by combining an optical attenuator and an isolator into a module, is provided. The optical attenuating isolator includes a first collimator, an optical attenuating filter, an isolation unit, and a second collimator. The first collimator is connected to a first optical transmission medium, and collimates light received via the first optical transmission medium. The optical attenuating filter attenuates the output light of the first collimator. The isolation unit receives light attenuated by the optical attenuating filter and passes only polarized light which is polarized in a predetermined specific polarization direction. The second collimator is connected to a second optical transmission medium, and collimates polarized light which has passed through the isolation unit, and transmits the resultant light to the second optical transmission medium. Accordingly, an optical attenuator and an isolator are configured into a module, such that insertion loss can be reduced, and that the number of optical transmission media used is reduced, thus preventing generation of loss caused by the optical transmission media. Also, an optical attenuating isolator according to the present invention is used as an optical attenuator for an optical communications system having directivity, such that deterioration of the optical communications system due to back reflection can be prevented, and that the degree of attenuation can be controlled.

摘要翻译： 提供了通过将光衰减器和隔离器组合成模块而获得的光衰减隔离器。 光衰减隔离器包括第一准直器，光衰减滤波器，隔离单元和第二准直器。 第一准直器连接到第一光传输介质，并且对通过第一光传输介质接收的光进行准直。 光衰减滤波器衰减第一准直仪的输出光。 隔离单元接收由光衰减滤波器衰减的光，并且仅使偏振光在预定的特定偏振方向上通过。 第二准直器连接到第二光传输介质，并且准直已经通过隔离单元的偏振光，并将所得到的光透射到第二光传输介质。 因此，光衰减器和隔离器被配置成模块，从而可以减少插入损耗，并且减少使用的光传输介质的数量，从而防止由光传输介质引起的损耗的产生。 此外，根据本发明的光衰减隔离器被用作具有方向性的光通信系统的光衰减器，使得可以防止由于反射反射导致的光通信系统的劣化，并且可以控制衰减的程度 。