公开(公告)号：US07405870B2

公开(公告)日：2008-07-29

申请号：US11645161

申请日：2006-12-26

申请人： Lijie Qiao ,  Paul J. Vella

发明人： Lijie Qiao ,  Paul J. Vella

IPC分类号： H01S3/00

CPC分类号： H01S3/1301 ,  H01S3/06754 ,  H01S3/1305 ,  H01S2301/02

摘要： An optical amplifier system and controller and a method for automatically controlling the usable signal power of an optical amplifier are provided. The method differentiates between the total optical power that includes the amplified spontaneous emission (ASE), and the useful amplified optical signal power at the output of the amplifier. The optical amplifier system comprises an optical amplifier, a first and a second photodetector operable to measure the power of the input and output signals of the optical amplifier and an amplification controller with a control input. The amplification controller is operable to compensate for the ASE power when operating in automatic signal power control mode.

摘要翻译： 提供一种光放大器系统和控制器以及用于自动控制光放大器的可用信号功率的方法。 该方法区分包括放大的自发发射（ASE）的总光功率和放大器输出端的有用放大光信号功率。 光放大器系统包括光放大器，第一和第二光电检测器，其可操作以测量光放大器的输入和输出信号的功率以及具有控制输入的放大控制器。 放大控制器可操作以在以自动信号功率控制模式操作时补偿ASE功率。

公开(公告)号：US07457032B2

公开(公告)日：2008-11-25

申请号：US11231874

申请日：2005-09-22

申请人： Lijie Qiao ,  Paul J. Vella

发明人： Lijie Qiao ,  Paul J. Vella

IPC分类号： H04B10/08 ,  H04B10/17

CPC分类号： H04B10/07955 ,  H04B10/07953

摘要： An arrangement has a WDT (Wavelength-Dependent Tap) coupled in an OCS (Optical Communication System) and an OPM (Optical Performance Monitoring) function coupled to the WDT. The WDT is adapted to receive from the OCS an input optical signal having noise and channels at respective channel wavelengths. The WDT couples to an output some of the input optical signal at the channel wavelengths and most of a noise power at wavelengths between the channel wavelengths, and couples a remaining portion of the input optical signal back into the optical communication system. The optical performance monitoring function determines a power characteristic of the input optical signal as a function of a power from the output. The power characteristic may be an OSNR (Optical Signal-to-Noise Ratio) determined as a function of a signal power and a noise power of the output optical signal.

摘要翻译： 一种布置具有耦合到OCS（光通信系统）中的WDT（波长相关抽头）和耦合到WDT的OPM（光学性能监视）功能。 WDT适于从OCS接收具有各个信道波长的噪声和信道的输入光信号。 WDT在通道波长处的输出光信号中输出一些输入光信号，并且在通道波长之间波长处的噪声功率的大部分耦合，并将输入光信号的剩余部分耦合回光通信系统。 光学性能监视功能根据输出的功率确定输入光信号的功率特性。 功率特性可以是根据信号功率和输出光信号的噪声功率确定的OSNR（光信噪比）。

公开(公告)号：US07324268B2

公开(公告)日：2008-01-29

申请号：US10800747

申请日：2004-03-16

申请人： Lijie Qiao ,  Paul J. Vella

发明人： Lijie Qiao ,  Paul J. Vella

IPC分类号： H01S4/00 ,  H04B10/12

CPC分类号： H04B10/294 ,  H01S3/005 ,  H01S3/0064 ,  H01S3/0078 ,  H01S3/06758 ,  H01S3/06766 ,  H01S3/0677 ,  H01S3/1608 ,  H04B2210/003

摘要： An optical amplification apparatus is provided comprising a plurality of fiber amplification media segments which are concatenated in series wherein subsequent to each fiber amplification media segment one or more wavelengths is dropped so as to exploit a gain versus fiber amplification media physical length characteristic. By exploiting the gain versus fiber amplification media physical length characteristic in such a manner it is possible to achieve a substantially flat gain response for a multi-wavelength output of the optical amplification apparatus. Some embodiments of the invention combine noise suppression and additional gain flattening on one or more wavelengths. Embodiments of the optical amplification apparatus can be used in red-band wavelength range applications of coarse wavelength division multiplexing (CWDM). Some embodiments of the invention also provide that the optical amplification apparatus can be used as a hybrid dense wavelength division multiplexing (DWDM) and CWDM optical amplifier.

摘要翻译： 提供了一种光学放大装置，其包括串联连接的多个光纤放大介质段，其中随后的每个光纤放大介质区段落下一个或多个波长，以利用增益对光纤放大介质的物理长度特性。 通过以这种方式利用增益对光纤放大介质的物理长度特性，可以实现对于光放大装置的多波长输出的基本平坦的增益响应。 本发明的一些实施例将噪声抑制和附加增益平坦化结合在一个或多个波长上。 光放大装置的实施例可以用于粗波分复用（CWDM）的红带波长范围应用。 本发明的一些实施例还提供了光放大装置可以用作混合密集波分复用（DWDM）和CWDM光放大器。

公开(公告)号：US20070297044A1

公开(公告)日：2007-12-27

申请号：US11645161

申请日：2006-12-26

申请人： Lijie Qiao ,  Paul J. Vella

发明人： Lijie Qiao ,  Paul J. Vella

IPC分类号： H01S3/00

CPC分类号： H01S3/1301 ,  H01S3/06754 ,  H01S3/1305 ,  H01S2301/02

摘要： An optical amplifier system and controller and a method for automatically controlling the usable signal power of an optical amplifier are provided. The method differentiates between the total optical power that includes the amplified spontaneous emission (ASE), and the useful amplified optical signal power at the output of the amplifier. The optical amplifier system comprises an optical amplifier, a first and a second photodetector operable to measure the power of the input and output signals of the optical amplifier and an amplification controller with a control input. The amplification controller is operable to compensate for the ASE power when operating in automatic signal power control mode.

摘要翻译： 提供一种光放大器系统和控制器以及用于自动控制光放大器的可用信号功率的方法。 该方法区分包括放大的自发发射（ASE）的总光功率和放大器输出端的有用放大光信号功率。 光放大器系统包括光放大器，第一和第二光电检测器，其可操作以测量光放大器的输入和输出信号的功率以及具有控制输入的放大控制器。 放大控制器可操作以在以自动信号功率控制模式操作时补偿ASE功率。

公开(公告)号：US10297970B2

公开(公告)日：2019-05-21

申请号：US15481524

申请日：2017-04-07

申请人： Lijie Qiao

发明人： Lijie Qiao

IPC分类号： H01S3/08 ,  H01S3/10 ,  H01S3/16 ,  H01S3/067 ,  H01S3/0941

摘要： A multi-stage optical amplifier has an input port for receiving an optical signal and a relatively short erbium doped optical fiber is coupled to the input port. Complex costly pump feedback is not required as a constant non-varying saturation pump is configured to provide non varying output power pump light of a predetermined wavelength suitable for excitation and full saturation of the erbium ions such that a full population inversion occurs. The length of the short erbium doped fiber and rare earth doping concentration of the erbium doped fiber is such that when pumped by said pump provides amplification of the optical signal of less than 15 dB. Locating a gain flattening filter after the short erbium doped optical fiber provides a relatively flat amplified output signal. Multi-stages of similar short erbium doped fibers pumped and saturated by the same pump signal economically provide increased amplification of the signal and filters after each state flatten the gain.

公开(公告)号：US09184554B2

公开(公告)日：2015-11-10

申请号：US14469661

申请日：2014-08-27

申请人： Lijie Qiao

发明人： Lijie Qiao

IPC分类号： H01S3/067 ,  H01S3/13 ,  H01S3/131 ,  H04B10/2507

CPC分类号： H01S3/1317 ,  H01S3/06754 ,  H01S3/10015 ,  H01S3/1302 ,  H01S3/2391

摘要： Devices and methods for lessening a thermal dependence of gain profile of an optical amplifier are disclosed. An optical beam is split in two sub-beams with a thermally variable power splitting ratio. One sub-beam travels a longer optical path length than the other. When the two sub-beams are recombined, they interfere with each other, causing the throughput to be wavelength dependent. An amplitude of this wavelength dependence is thermally variable due to the thermally variable power splitting ratio. The thermally variable power splitting ratio and the optical path length difference are selected so as to offset a thermal variation of a spectral gain profile of an optical amplifier.

摘要翻译： 公开了用于减轻光放大器的增益曲线的热依赖性的装置和方法。 光束被分成具有热可变功率分配比的两个子光束。 一个子光束行进比另一个更长的光程长度。 当两个子光束重组时，它们彼此干扰，导致吞吐量与波长相关。 由于热可变功率分配比，该波长依赖性的振幅是热变量的。 选择热可变功率分配比和光程长度差，以抵消光放大器的光谱增益分布的热变化。

公开(公告)号：US10297971B2

公开(公告)日：2019-05-21

申请号：US15481529

申请日：2017-04-07

申请人： Lijie Qiao

发明人： Lijie Qiao

IPC分类号： H01S3/08 ,  H01S3/10 ,  H01S3/16 ,  H01S3/067 ,  H01S3/0941

摘要： A multi-stage optical amplifier has an input port for receiving an optical signal and a relatively short erbium doped optical fiber is coupled to the input port. Complex costly pump feedback is not required as a constant non-varying saturation pump is configured to provide non varying output power pump light of a predetermined wavelength suitable for excitation and full saturation of the erbium ions such that a full population inversion occurs. The length of the short erbium doped fiber and rare earth doping concentration of the erbium doped fiber is such that when pumped by said pump provides amplification of the optical signal of less than 15 dB. Locating a gain flattening filter after the short erbium doped optical fiber provides a relatively flat amplified output signal. Multi-stages of similar short erbium doped fibers pumped and saturated by the same pump signal economically provide increased amplification of the signal and filters after each state flatten the gain.

公开(公告)号：US08363311B2

公开(公告)日：2013-01-29

申请号：US12645541

申请日：2009-12-23

申请人： Lijie Qiao

发明人： Lijie Qiao

IPC分类号： H04B10/17 ,  H04B10/12

CPC分类号： H01S3/06758 ,  H01S3/094003 ,  H01S3/094061 ,  H01S3/0941 ,  H01S3/10023 ,  H01S3/1301

摘要： An optical amplifier has a pump and an “anti-pump” for reducing a variation of the amplifier gain with the input optical power. The wavelength of “anti-pump” light is longer than the wavelength of the optical signal being amplified, so that the optical signal serves as a pump for the “anti-pump” light, whereby an optical loss variation with the signal power at the signal wavelength is created, which reduces optical gain variation with the signal power. To compensate for gain loss due to the anti-pump light, two and three stages of amplification can be used.

摘要翻译： 光放大器具有用于减小放大器增益与输入光功率变化的泵和抗泵。 抗泵浦光的波长比被放大的光信号的波长长，使得光信号用作抗泵浦光的泵，由此产生信号波长处的信号功率的光损耗变化 ，这降低了信号功率的光增益变化。 为了补偿由于抗泵浦光引起的增益损失，可以使用两级和三级放大。

公开(公告)号：US09680284B2

公开(公告)日：2017-06-13

申请号：US14881198

申请日：2015-10-13

申请人： Lijie Qiao

发明人： Lijie Qiao

IPC分类号： H01S3/10 ,  G02F1/01 ,  G02F1/09 ,  H01S3/067 ,  H04B10/29 ,  H01S3/13 ,  G02F1/19 ,  H01S3/23 ,  H01S3/30

CPC分类号： H01S3/1003 ,  G02F1/0136 ,  G02F1/09 ,  G02F1/19 ,  H01S3/06754 ,  H01S3/1302 ,  H01S3/2391 ,  H01S3/302 ,  H01S2301/04 ,  H04B10/29 ,  H04B10/294

摘要： Devices and methods for lessening a thermal dependence of gain profile of an optical amplifier are disclosed. An optical beam is split in a plurality of sub-beams with a thermally variable power splitting ratio, e.g. one sub-beam may travel a longer optical path length than another. When the sub-beams are recombined, they interfere with each other, causing the throughput to be wavelength dependent. An amplitude of this wavelength dependence is thermally variable due to the thermally variable power splitting ratio. The thermally variable power splitting ratio and the optical path length difference are selected so as to offset a thermal variation of a spectral gain profile of an optical amplifier.

公开(公告)号：US20090060523A1

公开(公告)日：2009-03-05

申请号：US11892686

申请日：2007-08-27

申请人： Lijie Qiao ,  Ahmad Atieh ,  John Mills

发明人： Lijie Qiao ,  Ahmad Atieh ,  John Mills

IPC分类号： H04B10/12

CPC分类号： H04B10/07951

摘要： A system and method for in-service optical dispersion determination are provided. Optical dispersion is determined by splitting a first optical signal into two components, introducing a time delay between the two components such that corresponding pulses of the two components partially overlap, combining the two components to generate a combined optical signal comprising a first component and a second component, determining power of the combined optical signal while applying a plurality of dispersion compensation values, in order to determine a dispersion compensation value that results in a minimum detected power of the combined optical signal. Polarization Mode Dispersion is determined by adjusting the time delay that is introduced until the power of the combined optical signal is substantially equal for all of the plurality of dispersion compensation values.

摘要翻译： 提供了一种用于在线光学色散测定的系统和方法。 通过将第一光信号分成两个分量来确定光散射，在两个分量之间引入时间延迟，使得两个分量的相应脉冲部分重叠，组合两个分量以产生包括第一分量和第二分量的组合光信号 分量，在施加多个色散补偿值时确定组合光信号的功率，以便确定导致组合光信号的最小检测功率的色散补偿值。 极化模式通过调整引入的时间延迟来确定分散，直到组合的光信号的功率对于所有多个色散补偿值为基本相等。