公开(公告)号：US07023611B2

公开(公告)日：2006-04-04

申请号：US10077617

申请日：2002-02-15

申请人： Tizhi Huang ,  Ming Xu ,  Chongchang Mao ,  Tiejun Xia ,  Wei Feng

发明人： Tizhi Huang ,  Ming Xu ,  Chongchang Mao ,  Tiejun Xia ,  Wei Feng

IPC分类号： H04B10/12

CPC分类号： H04B10/2941 ,  H04B10/0731

摘要： Devices and methods for equalizing the gain of an optical amplifier are described. For devices including harmonic filters that are controllable by amplitude control voltages and phase control voltages, techniques for controlling the amplitude control voltages and phase control voltages are presented. Additionally, device architectures are described by which an incoming optical signal is equalized to compensate for uneven gain in prior amplifiers or other optical components, and in which the incoming optical signal is received at a beam displacer and separated into orthogonal component beams, wherein the beams are counter-propagated through the equalizer in opposite directions through the same spatial path so as to minimize or eliminate the effects spatially dependent imperfections in the equalizer.

公开(公告)号：US06583903B1

公开(公告)日：2003-06-24

申请号：US09517402

申请日：2000-03-02

申请人： David G. Way ,  Tiejun Xia

发明人： David G. Way ,  Tiejun Xia

IPC分类号： H04B1000

CPC分类号： H04B10/2569

摘要： In an optical data communications link, a modulated optical signal is emitted from an optical transmitter, coupled into one end of an optical fiber, and received by an optical receiver at the opposite end of the fiber. The present invention relates to reducing the polarization-mode dispersion (PMD) of the modulated optical signal caused by the birefringence of the fiber, which tends to limit the usable bandwidth of the fiber. A polarization controller is applied to the modulated optical signal substantially near the transmitter. The receiver measures the quality of the received signal and issues commands to the polarization controller to improve the received signal quality. In various embodiments, the signal quality measurement may be based on observed bit-error-rate (BER), estimated best attainable BER, or estimates of PMD affecting the received signal. Such measurements may be performed in the receiver by altering the threshold level and sampling timing of a bit detector in the receiver and monitoring the resulting changes in BER. Polarization control from the receiver are preferably coupled to the polarization controller through the same optical fiber carrying the modulated optical signal.

摘要翻译： 在光学数据通信链路中，调制的光信号从耦合到光纤的一端的光发射器发射，并由光纤的另一端的光接收器接收。 本发明涉及减少由光纤的双折射引起的调制光信号的偏振模色散（PMD），这倾向于限制光纤的可用带宽。 偏振控制器被应用于基本上靠近发射机的调制光信号。 接收机测量接收信号的质量并向极化控制器发出命令以改善接收的信号质量。在各种实施例中，信号质量测量可以基于观察到的比特误码率（BER），估计的可达到的最佳BER， 或影响接收信号的PMD的估计。 这样的测量可以在接收机中通过改变接收机中的位检测器的阈值电平和采样定时来执行，并且监视所得到的BER的变化。来自接收器的极化控制优选地通过相同的光纤耦合到偏振控制器， 调制光信号。

公开(公告)号：US07711267B2

公开(公告)日：2010-05-04

申请号：US11239330

申请日：2005-09-30

申请人： Glenn Wellbrock ,  Tiejun Xia

发明人： Glenn Wellbrock ,  Tiejun Xia

IPC分类号： H04B10/08 ,  H04J14/00

CPC分类号： H04L43/0811 ,  H04L43/0847

摘要： In one implementation, a system detects that a fiber within a fiber optic cable has failed and automatically causes a location of a faulty portion of the fiber to be identified in response to the detecting. In another implementation, a central office includes a first optical patch panel operably coupled to an optical fiber and a second optical patch panel configured to couple the first optical patch panel to a test device. The optical fiber is automatically coupled to the test device in response to one or more signals from a remote management device.

摘要翻译： 在一个实施方式中，系统检测到光纤电缆内的光纤已经发生故障，并且响应于检测自动地使光纤的故障部分的位置被识别。 在另一实现中，中心局包括可操作地耦合到光纤的第一光学接线板和被配置为将第一光学接线板耦合到测试设备的第二光学接线板。 响应于来自远程管理设备的一个或多个信号，光纤自动耦合到测试设备。

公开(公告)号：US06445848B1

公开(公告)日：2002-09-03

申请号：US09674419

申请日：2000-10-31

申请人： Mohammed N. Islam ,  George A. Nowak ,  Tiejun Xia

发明人： Mohammed N. Islam ,  George A. Nowak ,  Tiejun Xia

IPC分类号： G02B628

CPC分类号： H04B10/25077 ,  G02F1/3519

摘要： Disclosed is an optical circuit for filtering and frequency modulation of soliton signal pulses traveling over long spans of waveguide fiber. The circuit makes use of the filtering properties of a non-linear optical loop mirror (NOLM). The time difference between control pulses and signal pulses co-propagating in the NOLM is controlled to increase or decrease the centroid shift of the signal pulses. The signal and control pulse streams are derived from a single stream of soliton pulses. The NOLM serves to filter low power noise from the soliton signal pulses at the same time as it shifts the centroid frequency of the soliton signal pulses up or down. The circuit can be inserted at advantageous points along a waveguide fiber transmission line to allow propagation of solitons, without electronic regeneration, over line lengths of 100 km.

摘要翻译： 公开了一种用于对在波导纤维的长跨度上行进的孤子信号脉冲进行滤波和频率调制的光电路。 该电路利用非线性光学环路反射镜（NOLM）的滤波特性。 在NOLM中共同传播的控制脉冲和信号脉冲之间的时间差被控制以增加或减小信号脉冲的质心移动。 信号和控制脉冲流源自单个孤子脉冲流。 NOLM用于从孤子信号脉冲中滤除低功率噪声，同时它们将孤子信号脉冲的质心频率向上或向下移动。 电路可以沿着波导纤维传输线的有利点插入，以允许在100公里的线路长度上无需电子再生的孤子的传播。

公开(公告)号：US06366728B1

公开(公告)日：2002-04-02

申请号：US09493634

申请日：2000-01-28

申请人： David G. Way ,  Tiejun Xia ,  Yisong Li

发明人： David G. Way ,  Tiejun Xia ,  Yisong Li

IPC分类号： G02B602

CPC分类号： H04B10/25253 ,  G02B6/02261 ,  G02B6/02266 ,  G02B6/29377

摘要： An exemplary composite optical fiber transmission line and method are provided that result in significant advantages. The composite optical fiber transmission line includes a standard single-mode fiber, such as an SMF-28 fiber, a dispersion shifted fiber, such as an NZDSF fiber, and a dispersion compensating fiber. The single-mode fiber receives an input optical signal at a first end and generates a single-mode optical signal at a second end. The dispersion shifted fiber receives the single-mode optical signal at a first end and generates an output optical signal at a second end. The dispersion compensating fiber receives the output optical signal and generates a chromatic dispersion compensated optical signal that, preferably, is at some desired chromatic dispersion level. In one example, the residual chromatic dispersion of the composite optical fiber transmission line is zero or near zero, and the residual chromatic dispersion slope of the composite optical fiber transmission line is zero or near zero.

摘要翻译： 提供了一种示例性的复合光纤传输线和方法，其产生显着的优点。 复合光纤传输线包括诸如SMF-28光纤的标准单模光纤，诸如NZDSF光纤的色散位移光纤和色散补偿光纤。 单模光纤在第一端接收输入光信号，并在第二端产生单模光信号。 色散位移光纤在第一端接收单模光信号，并在第二端产生输出光信号。 色散补偿光纤接收输出光信号，并产生色散补偿光信号，该光信号最好处于某种期望的色散级。 在一个示例中，复合光纤传输线的残余色散为零或接近零，并且复合光纤传输线的残余色散斜率为零或接近零。

公开(公告)号：US20060280401A1

公开(公告)日：2006-12-14

申请号：US11460163

申请日：2006-07-26

申请人： Tiejun Xia ,  David Chen

发明人： Tiejun Xia ,  David Chen

IPC分类号： G02B6/28

CPC分类号： G02B6/29365 ,  G02B6/29361 ,  G02B6/29383 ,  G02B6/29395 ,  G02B6/29398 ,  H04J14/021

摘要： A method for implementing a truly hitless tunable filter for use in adding and/or dropping channels in a wavelength division multiplexed (WDM) network is disclosed. An exemplary method for filtering an optical signal may include providing a composite optical signal having several wavelengths including a first wavelength, a second wavelength and other wavelengths. The method may include passing the first wavelength through a filter and reflecting the second wavelength and the other wavelengths with the filter. The method may include making the first wavelength available to a drop port, and making the second wavelength and the other wavelengths available to an output port.

摘要翻译： 公开了一种实现用于在波分复用（WDM）网络中添加和/或删除信道的真正无中继可调滤波器的方法。 用于滤波光信号的示例性方法可以包括提供具有包括第一波长，第二波长和其它波长的若干波长的复合光信号。 该方法可以包括使第一波长通过滤波器并且用滤波器反射第二波长和其它波长。 该方法可以包括使第一波长可用于下降端口，并且使第二波长和其它波长可用于输出端口。

公开(公告)号：US20070076884A1

公开(公告)日：2007-04-05

申请号：US11239328

申请日：2005-09-30

申请人： Glenn Wellbrock ,  Tiejun Xia ,  David Chen

发明人： Glenn Wellbrock ,  Tiejun Xia ,  David Chen

IPC分类号： H04L9/00

CPC分类号： H04L9/0858

摘要： A method is provided for distributing quantum cryptographic keys. The method includes receiving a first quantum signal from an initial quantum key generating transmitter. Following correspondence with the initial quantum key generating transmitter, a first quantum key is generated. A second quantum signal is transmitted to a recipient quantum key generating transmitter. Following correspondence with the recipient quantum key generating receiver, a second quantum key is generated. The first quantum key is encoded using the second quantum key. The encoded first quantum key is transmitted to the recipient quantum key generating receiver using the second quantum key.

摘要翻译： 提供了一种分配量子加密密钥的方法。 该方法包括从初始量子密钥生成发射机接收第一量子信号。 在与初始量子密钥生成发射机对应之后，产生第一量子密钥。 第二量子信号被发送到接收量子密钥发生器。 在与收件人量子密钥生成接收者对应之后，产生第二量子密钥。 使用第二量子密钥对第一量子密钥进行编码。 使用第二量子密钥将编码的第一量子密钥发送到接收量子密钥生成接收器。

公开(公告)号：US20060280402A1

公开(公告)日：2006-12-14

申请号：US11460165

申请日：2006-07-26

申请人： Tiejun Xia ,  David Chen

发明人： Tiejun Xia ,  David Chen

IPC分类号： G02B6/28

CPC分类号： G02B6/29365 ,  G02B6/29361 ,  G02B6/29383 ,  G02B6/29395 ,  G02B6/29398 ,  H04J14/021

摘要： A method for implementing a truly hitless tunable filter for use in adding and/or dropping channels in a wavelength division multiplexed (WDM) network is disclosed. An exemplary method for filtering an optical signal may include providing a composite optical signal having several wavelengths including a first wavelength, a second wavelength and other wavelengths. The method may include passing the first wavelength through a filter and reflecting the second wavelength and the other wavelengths with the filter. The method may include making the first wavelength available to a drop port, and making the second wavelength and the other wavelengths available to an output port.

摘要翻译： 公开了一种实现用于在波分复用（WDM）网络中添加和/或删除信道的真正无中继可调滤波器的方法。 用于滤波光信号的示例性方法可以包括提供具有包括第一波长，第二波长和其它波长的多个波长的复合光信号。 该方法可以包括使第一波长通过滤波器并且用滤波器反射第二波长和其它波长。 该方法可以包括使第一波长可用于下降端口，并且使第二波长和其它波长可用于输出端口。

公开(公告)号：US06515786B1

公开(公告)日：2003-02-04

申请号：US09922989

申请日：2001-08-03

申请人： Tiejun Xia ,  Chi-Hao Cheng ,  Shuxin Li ,  Jian-Yu Liu ,  Kuang-Yi Wu

发明人： Tiejun Xia ,  Chi-Hao Cheng ,  Shuxin Li ,  Jian-Yu Liu ,  Kuang-Yi Wu

IPC分类号： G02F103

CPC分类号： G02F1/313

摘要： An optical device comprises a first birefringent crystal having a first length, a second birefringent crystal having a second length, and a dynamic polarization rotator. An optical signal propagating through the first and second birefringent crystals has an effective optical path length based, at least in part, upon the first length of the first birefringent crystal and the second length of the second birefringent crystal. The dynamic polarization rotator adjusts the effective optical path length of the optical signal in response to a control signal.

摘要翻译： 光学装置包括具有第一长度的第一双折射晶体，具有第二长度的第二双折射晶体和动态偏振旋转器。 传播通过第一和第二双折射晶体的光信号具有至少部分地基于第一双折射晶体的第一长度和第二双折射晶体的第二长度的有效光程长度。 动态偏振旋转器响应于控制信号调节光信号的有效光程长度。

公开(公告)号：US06229606B1

公开(公告)日：2001-05-08

申请号：US09415348

申请日：1999-10-08

申请人： David Way ,  Tiejun Xia

发明人： David Way ,  Tiejun Xia

IPC分类号： G01J400

CPC分类号： H04B10/2569 ,  G01M11/336

摘要： A method, a system and a computer program product configured to determine a differential group delay of two sequential optical beams based on a frequency dependence of a length of an optical path traveled by the two sequential optical beams in a dispersion compensation grating. The determined differential group delay provides a measure of polarization mode dispersion in the dispersion compensation grating.

摘要翻译： 一种方法，系统和计算机程序产品，其被配置为基于在色散补偿光栅中由两个顺序光束行进的光路的长度的频率依赖性来确定两个顺序光束的差分组延迟。 确定的差分群延迟提供了色散补偿光栅中偏振模色散的测量。