公开(公告)号：US06470113B1

公开(公告)日：2002-10-22

申请号：US09612437

申请日：2000-07-07

申请人： Seong-Teak Hwang ,  Soo-Young Yoon ,  Rae-Sung Jung ,  Jeong-Mee Kim ,  Sung-Jun Kim

发明人： Seong-Teak Hwang ,  Soo-Young Yoon ,  Rae-Sung Jung ,  Jeong-Mee Kim ,  Sung-Jun Kim

IPC分类号： G02B666

CPC分类号： H01S3/06795 ,  H01S3/06754

摘要： Disclosed is a broadband light source for measurement using a seed-beam which can reduce the strength difference between the output lights per wavelength by heightening the strength of the output light corresponding to the L-band of the light source, and thus reduce the measurement error per wavelength. The broadband light source includes a seed-beam light source for outputting a seed-beam of a predetermined band of wavelength, a first optical coupler for combining the seed-beam and a pumping light and making a combined light incident to a front of a rare earth ion-doped optical fiber, a first pumping light source for providing the pumping light to the first optical coupler, a second optical coupler for making the input pumping light incident to a rear of the rare earth ion-doped optical fiber, a second pumping light source for providing the pumping light to the second optical coupler, and an output terminal for radiating the light outputted through the rear of the rare earth ion-doped optical fiber.

摘要翻译： 公开了一种用于使用种子束进行测量的宽带光源，其可以通过提高对应于光源的L波段的输出光的强度来降低每波长的输出光之间的强度差，并且因此降低测量误差 每个波长。 宽带光源包括用于输出预定波段波段的种子束的种子束光源，用于组合种子束和泵浦光的第一光耦合器，并将入射到罕见的前面的组合光 地球离子掺杂光纤，用于向第一光耦合器提供泵浦光的第一泵浦光源，用于使输入泵浦光入射到稀土离子掺杂光纤的后部的第二光耦合器，第二泵浦 用于向第二光耦合器提供泵浦光的光源和用于照射通过稀土离子掺杂光纤的后部输出的光的输出端子。

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：US06244757B1

公开(公告)日：2001-06-12

申请号：US09223308

申请日：1998-12-30

申请人： Sung-Jun Kim ,  Jeong-Mee Kim

发明人： Sung-Jun Kim ,  Jeong-Mee Kim

IPC分类号： G02B6255

CPC分类号： G02B6/2552 ,  G02B6/2551

摘要： A method for fabricating a thermally expanded core (TEC) fiber including the steps of arc-fusion splicing two optical fibers having different clad outer diameters, and cutting boundary surface between an optical fiber having a small clad outer diameter and an optical fiber having a large clad outer diameter of the two optical fibers to obtain the thermally expanded core (TEC) fiber. Also, the method further includes the step of polishing the cutting face of the optical fiber having a small clad outer diameter of the two cut optical fibers.

摘要翻译： 一种制造热膨胀芯（TEC）纤维的方法，包括以下步骤：对具有不同包层外径的两根光纤进行电弧熔接，以及切割具有小包层外径的光纤与具有大的外部光纤的光纤之间的边界面 两个光纤的包层外径，以获得热膨胀芯（TEC）纤维。 此外，该方法还包括对具有两个切割的光纤的外包层外径小的光纤的切割面进行抛光的步骤。

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：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：US06701042B1

公开(公告)日：2004-03-02

申请号：US09482533

申请日：2000-01-14

申请人： Yong-Hoon Kang ,  Jeong-Mee Kim

发明人： Yong-Hoon Kang ,  Jeong-Mee Kim

IPC分类号： G02B634

CPC分类号： G02B6/12019 ,  H04J14/02

摘要： An arrayed waveguide grating (AWG) module monitors the quality of a wavelength division multiplexed (WDM) multi-channel optical signal without using a special measurer in a wavelength division multiplexing (WDM) system, and a device monitors a WDM optical signal using the AWG module. The AWG module includes an input waveguide, a first star coupler, an AWG unit, a second star coupler, and an optical power measurer. The input waveguide receives the WDM optical signal via an optical signal transmission medium. The first star coupler splits the power of the received WDM optical signal and transmits split optical signals to waveguides of the AWG unit. The AWG unit processes the split optical signals so that they have phase differences which are proportional to the difference between the lengths of the waveguides included in the AWG unit. The second star coupler focuses the optical signals received from the AWG unit at different locations by causing mutual interference between the received optical signals. The optical power measurer is directly connected to the second star coupler, and generates electrical signals depending on power values of the optical signals focused by the second star coupler. As a result, the characteristics of the optical signals of different channels constituting a WDM optical signal can be measured without a special measurer, and the spectrum of an optical signal with respect to the overall wavelength band can also be obtained. Also, the AWG module has a structure which is suitable for mass production.

摘要翻译： 阵列波导光栅（AWG）模块监视波分多路复用（WDM）多通道光信号的质量，而不在波分复用（WDM）系统中使用特殊测量器，并且器件使用AWG监视WDM光信号 模块。 AWG模块包括输入波导，第一星形耦合器，AWG单元，第二星形耦合器和光功率测量器。 输入波导通过光信号传输介质接收WDM光信号。 第一颗星耦合器分离接收到的WDM光信号的功率，并将分离的光信号发送到AWG单元的波导。 AWG单元处理分离的光信号，使得它们具有与包括在AWG单元中的波导的长度之间的差成比例的相位差。 第二颗星耦合器通过引起接收到的光信号之间的相互干扰，将来自AWG单元的光信号聚焦在不同位置。 光功率测量器直接连接到第二星形耦合器，并根据由第二星形耦合器聚焦的光信号的功率值产生电信号。 结果，可以在没有特殊测量器的情况下测量构成WDM光信号的不同通道的光信号的特性，并且还可以获得关于总波长带的光信号的光谱。 此外，AWG模块具有适合于批量生产的结构。

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：US06437907B1

公开(公告)日：2002-08-20

申请号：US09610321

申请日：2000-07-05

申请人： Soo-Young Yoon ,  Seong-Teak Hwang ,  Rae-Sung Jung ,  Jeong-Mee Kim ,  Sung-Jun Kim

发明人： Soo-Young Yoon ,  Seong-Teak Hwang ,  Rae-Sung Jung ,  Jeong-Mee Kim ,  Sung-Jun Kim

IPC分类号： H04B1012

CPC分类号： H04B10/294

摘要： A method and apparatus for amplifying the optical signals of a C-band (1550 nm wavelength band) and a L-band (1580 nm wavelength band) in a wide-band optical fiber amplifier, wherein the incoming optical signals are separated into the 1550 nm wavelength band and the 1580 nm wavelength band by a WVDM optical coupler and respectively amplified by a C-band EDFA and a L-band EDFA A backward ASE generated by the C-band EDFA is fed back to the L-band EDFA by a circulator as a supplementary pumping light to the amplification of the optical signals of the 1580 nm wavelength band.

摘要翻译： 一种用于放大宽带光纤放大器中的C波段（1550nm波长带）和L波段（1580nm波长带）的光信号的方法和装置，其中输入光信号被分离成1550 nm波长带和1580nm波长带，并由C波段EDFA和L波段EDFA A分别放大，由C波段EDFA产生的反向ASE由A波段EDFA反馈回L波段EDFA 循环器作为辅助泵浦光，以放大1580nm波长带的光信号。

公开(公告)号：US06404540B1

公开(公告)日：2002-06-11

申请号：US09597779

申请日：2000-06-20

申请人： Seong-Teak Hwang ,  Soo-Young Yoon ,  Rae-Sung Jung ,  Jeong-Mee Kim ,  Sung-Jun Kim

发明人： Seong-Teak Hwang ,  Soo-Young Yoon ,  Rae-Sung Jung ,  Jeong-Mee Kim ,  Sung-Jun Kim

IPC分类号： H01S300

CPC分类号： H04B10/294 ,  H01S3/06754 ,  H01S3/1608 ,  H01S2301/04

摘要： A L-band(long-band) optical fiber amplifier is provided. The L-band optical fiber amplifier includes an optical fiber doped with a rare-earth element, at least one pumping light source for emitting pumping light to the optical fiber, a seed beam source for emitting a seed beam at a predetermined wavelength band, and a seed beam coupler disposed between an input terminal and the optical fiber, for coupling an input optical signal with the seed beam and feeding the coupled light forward to the optical fiber. By use of the seed beam, the L-band optical fiber amplifier improves gain flatness characteristics at wavelengths of an optical signal and increases amplification efficiency when the length of the optical fiber and the intensities of the optical signal and the pumping light are changed.

摘要翻译： 提供了一个L波段（长波段）光纤放大器。 L波段光纤放大器包括掺杂有稀土元素的光纤，用于向光纤发射泵浦光的至少一个泵浦光源，用于发射预定波长带的种子束的种束源，以及 种子光束耦合器，设置在输入端和光纤之间，用于将输入光信号与种子光耦合并将耦合的光向前馈送到光纤。 通过使用种子束，L波段光纤放大器提高光信号的波长处的增益平坦度特性，并且当光纤的长度和光信号和泵浦光的强度改变时，增加放大效率。

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。