公开(公告)号：WO2005036783A1

公开(公告)日：2005-04-21

申请号：PCT/CA2004/001552

申请日：2004-08-23

Applicant: EXFO ELECTRO-OPTICAL ENGINEERING INC. ,  RUCHET, Bernard

Inventor： RUCHET, Bernard

IPC: H04B10/08

CPC classification number: H04B10/07955 ,  H04B3/46 ,  H04B10/079 ,  H04B10/0793 ,  H04B10/0795 ,  H04B10/07953 ,  H04Q11/0067 ,  H04Q2011/0083

Abstract: An instrument f or measuring bidirectional optical signals propagating in an optical transmission path between elements one of which will not transmit if continuity of the transmission path is not maintained, for example a branch path between a central offices optical line terminal (OLT) and an end-user's optical network terminal (ONT), comprises first and second connector receptacles for connecting the instrument into the path, a 2 x 2 coupler (32) having first and second ports (28, 30) connected to the first and second connectors (22, 24), respectively, for completing the optical transmission path, a third port (36) for, outputting a portion of each optical signal received via the first port (28) and a fourth port (34) for outputting a portion of each optical signal received via the second port (30) Detectors (38, 42, 44) coupled to the third and fourth ports convert the optical signal portions into corresponding electrical signals, which are processed to provide the desired measurements. The measurement results may be displayed by a suitable display unit (60) Where the ÖLT transmits signals at two different wavelengths, the instrument may separate parts of the corresponding optical signal portion according to wavelength and process them separately.

Abstract translation: 一种用于测量在光传输路径中传播的双向光信号的仪器，其中一个传输路径在不保持传输路径的连续性的情况下将不传输，例如中心局光线路终端（OLT）和终端 用户的光网络终端（ONT）包括用于将仪器连接到路径中的第一和第二连接器插座;具有连接到第一和第二连接器（22）的第一和第二端口（28,30）的2×2耦合器（32） 24），用于完成光传输路径的第三端口（36），用于输出经由第一端口（28）接收的每个光信号的一部分的第三端口和用于输出每个光信号的一部分的第四端口（34） 经由第二端口（30）接收的耦合到第三和第四端口的检测器（38,42,44）将光信号部分转换成对应的电信号，其被处理以提供期望的测量 NTS。 测量结果可以由合适的显示单元显示（60）ÖLT以两个不同的波长发射信号，仪器可以根据波长分离相应的光信号部分，并单独处理。

公开(公告)号：WO2010033654A3

公开(公告)日：2010-03-25

申请号：PCT/US2009/057236

申请日：2009-09-17

Applicant: EXFO ELECTRO-OPTICAL ENGINEERING, INC. ,  WESTLUND, Mathias ,  ANDREKSON, Peter ,  SUNNERUD, Henrik ,  SKOLD, Mats

Inventor： WESTLUND, Mathias ,  ANDREKSON, Peter ,  SUNNERUD, Henrik ,  SKOLD, Mats

IPC: H04B10/12 ,  H04B10/00 ,  H04B10/02

Abstract: A two-gate sampling system has been designed to perform sampled balanced detection of one or more input signal pairs. The present invention performs simultaneous sampling of both signals in each signal pair followed by digitization and combination of the sample pairs using software. By first sampling the signals and then combining the sampled into the corresponding balanced detected signal it is possible to avoid the bandwidth limitations and impedance problems introduced by traditional balanced detectors and electrical oscilloscopes. In particular, for optical sampling gates very high bandwidth sampling gates can be designed without any impedance issues and hence almost perfect balanced detection reconstruction can be performed for very high speed signals. Balanced detection is becoming more and more important as the new phase modulated optical data signals are introduced to the market, such as e.g. PSK, DPSK, QPSK and DQPSK. The present invention is well suited for analysis of these new types of signals.

公开(公告)号：WO2008122123A1

公开(公告)日：2008-10-16

申请号：PCT/CA2008/000647

申请日：2008-04-04

Applicant: EXFO ELECTRO-OPTICAL ENGINEERING INC. ,  GARIEPY, Daniel ,  HE, Gang ,  BRETON, Yves

Inventor： GARIEPY, Daniel ,  HE, Gang ,  BRETON, Yves

IPC: H04B10/08 ,  H04B10/18 ,  H04J14/02

CPC classification number: H04B10/07953

Abstract: There is provided a method for determining the in-band noise in agile multichannel Dense Wavelength Division Multiplexing (DWDM) optical systems, where the interchannel noise is not representative of the in-band noise in the optical channel. The method relies on the analysis of two observations of the same input optical signal. In the two observations, the linear relationship between the optical signal contribution and the optical noise contribution (i.e. the observed OSNR) is different, which allows the discrimination of the signal and noise contributions in the input optical signal. In a first approach, the two observations are provided by polarization analysis of the input optical signal. In a second, the input optical signal is obtained using two different integration widths.

Abstract translation: 提供了一种用于确定敏捷多通道密集波分复用（DWDM）光学系统中的带内噪声的方法，其中信道间噪声不代表光信道中的带内噪声。 该方法依赖于对相同输入光信号的两次观察的分析。 在两个观察中，光信号贡献与光噪声贡献（即观测到的OSNR）之间的线性关系是不同的，这允许在输入光信号中识别信号和噪声贡献。 在第一种方法中，通过输入光信号的偏振分析来提供两个观察结果。 一秒钟，使用两个不同的积分宽度获得输入光信号。

公开(公告)号：WO2008116314A1

公开(公告)日：2008-10-02

申请号：PCT/CA2008/000577

申请日：2008-03-28

Applicant: EXFO ELECTRO-OPTICAL ENGINEERING INC. ,  CYR, Normand ,  CHEN, Hongxin

Inventor： CYR, Normand ,  CHEN, Hongxin

IPC: G01M11/02 ,  H01S3/067 ,  H01S3/082 ,  H01S3/23 ,  H01S5/026 ,  H01S5/10

CPC classification number: G01M11/336 ,  G01M11/335

Abstract: A method and apparatus for measuring at least one polarization-related characteristic of an optical path (FUT) uses a light input unit connected to the FUT at or adjacent a proximal end of the FUT and a light output unit connected to the FUT at or adjacent its proximal or distal end. The light input unit injects into the FUT at least partially polarized light having a controlled state of polarization (I-SOP). The output light unit extracts corresponding light from the FUT, analyzes and detects the extracted light corresponding to at least one transmission axis (A-SOP), and processes the corresponding electrical signal to obtain transmitted coherent optical power at each wavelength of light in each of at least two groups of wavelengths, wherein the lowermost (λ 1 ) and uppermost (λ u ) said wavelengths in each said group of wavelengths are closely- spaced. A processing unit than computes at least one difference in a measured power parameter corresponding to each wavelength in a wavelength pair for each of the at least two groups, the measured power parameter being proportional to the power of the said analyzed and subsequently detected light, thereby defining a set of at least two measured power parameter differences; computes the mean-square value of said set of differences; and calculating the at least one polarization-related FUT characteristic as at least one predetermined function of said mean-square value, the predetermined function being dependent upon the small optical frequency difference between the wavelengths corresponding to the said each at least said two pairs of closely-spaced wavelengths.

Abstract translation: 用于测量光路（FUT）的至少一个偏振相关特性的方法和装置使用在FUT的近端处或邻近FUT连接到FUT的光输入单元，以及连接到FUT在或相邻的FUT的光输出单元 其近端或远端。 光输入单元将具有受控的极化状态（I-SOP）的至少部分偏振光注入到FUT中。 输出光单元从FUT提取对应的光，分析并检测与至少一个透射轴（A-SOP）对应的提取光，并处理相应的电信号，以获得每个波长的每个波长的透射相干光焦度 至少两组波长，其中每个所述波长组中的所述最低（λ1 SUB）和最高（λ

公开(公告)号：WO2008009110A1

公开(公告)日：2008-01-24

申请号：PCT/CA2007/001260

申请日：2007-07-18

Applicant: EXFO ELECTRO-OPTICAL ENGINEERING, INC. ,  CHEN, Hongxin ,  SCHINN, Gregory, Walter

Inventor： CHEN, Hongxin ,  SCHINN, Gregory, Walter

IPC: H01S3/102 ,  H01S5/026

CPC classification number: H01S5/146 ,  H01S5/06216 ,  H01S5/1071 ,  H01S5/141 ,  H01S5/50

Abstract: A laser for generating laser light pulses comprises a cavity containing an active optical gain medium (102) and a spectral filtering device (104), a delay device (110) for delaying light by a predetermined delay time (Δt), means (106) for extracting a portion of laser light from the cavity, launching said portion into said delay means (110) and returning the delayed portion to the optical gain medium (102), control means (116) operable to activate the gain medium for a first time period (Cl) to produce a first laser light pulse (LPl) having a duration that is less than the delay time (Δt), and activate the gain medium for a second time period (C2) while a said delayed portion of the first light pulse that has been delayed by the delay means (UO) is traversing the gain medium (102), thereby to produce a second laser pulse (LP2) having a shorter duration and faster risetime than the first laser light pulse (LPl), and output means (108) for σutputting the second laser light pulse (LP2).

Abstract translation: 一种用于产生激光脉冲的激光器包括一个包含一个有源光学增益介质（102）和一个光谱滤波装置（104）的空腔，一个用于将光延迟预定延迟时间（Δt）的延迟装置（110），装置 ），用于从所述空腔提取一部分激光，将所述部分启动到所述延迟装置（110）中并将延迟部分返回到光学增益介质（102），控制装置（116）可操作以激活用于第一 时间周期（Cl）以产生具有小于延迟时间（Δt）的持续时间的第一激光脉冲（LP1），并且在第二时间段（C2）的所述延迟部分激活增益介质， 由延迟装置（UO）延迟的第一光脉冲正在越过增益介质（102），从而产生具有比第一激光脉冲（LP1）更短的持续时间和更快的上升时间的第二激光脉冲（LP2） 以及用于插入第二激光脉冲（LP2）的输出装置（108）。

公开(公告)号：WO2007036051A1

公开(公告)日：2007-04-05

申请号：PCT/CA2006/001610

申请日：2006-09-29

Applicant: EXFO ELECTRO-OPTICAL ENGINEERING INC. ,  CYR, Normand ,  CHEN, Hongxin

Inventor： CYR, Normand ,  CHEN, Hongxin

IPC: G01M11/02 ,  H04B10/08

CPC classification number: G01M11/3181

Abstract: In a method of measuring cumulative polarization mode dispersion (PMD) along the length of a fiber-under-test (FUT), a polarization-sensitive optical time domain reflectometer (POTDR) is used to inject into the FUT plural series of light pulses arranged in several groups. Each group comprises at least two series of light pulses having different but closely-spaced wavelengths and the same state of polarization (SOP). At least two, and preferably a large number of such groups, are injected and corresponding OTDR traces obtained for each series of light pulses by averaging the impulse-response signals of the several series of light pulses in the group. The process is repeated for a large number of groups having didfferent wavelengths and/or SOPs. The PMD then is obtained by normalizing the OTDR traces of all of the groups, then computing the difference between each normalized OTDR trace in one group and the corresponding normalized OTDR trace in another group, followed by the mean-square value of the differences. Finally, the PMD is computed as a predetermined function of the mean-square difference. The function may, for example, be a differential formula, an arcsine formula, and so on.

Abstract translation: 在沿着被测光纤（FUT）的长度测量累积偏振模色散（PMD）的方法中，使用极化敏感光时域反射计（POTDR）将FUT多个系列的光脉冲 在几个组。 每个组包括至少两个具有不同但紧密相隔的波长和相同的偏振状态（SOP）的光脉冲序列。 通过平均组中若干系列的光脉冲的脉冲响应信号，为每一系列光脉冲注入至少两个，优选大量的这样的基团和相应的OTDR迹线。 对于具有正确波长和/或SOP的大量组重复该过程。 然后通过归一化所有组的OTDR迹线获得PMD，然后计算一组中的每个归一化OTDR迹线与另一组中对应的归一化OTDR迹线之间的差异，随后是差的均方值。 最后，将PMD计算为均方差的预定函数。 该函数可以是例如微分公式，反正弦公式等。

公开(公告)号：WO2010095039A2

公开(公告)日：2010-08-26

申请号：PCT/IB2010/000479

申请日：2010-02-23

Applicant: EXFO ELECTRO-OPTICAL ENGINEERING, INC. ,  WESTLUND, Mathias ,  SKOLD, Mats ,  SUNNERUD, Henrik ,  ANDREKSON, Peter ,  RUCHET, Bernard

Inventor： WESTLUND, Mathias ,  SKOLD, Mats ,  SUNNERUD, Henrik ,  ANDREKSON, Peter ,  RUCHET, Bernard

IPC: H04B10/148

CPC classification number: H04B10/64 ,  H04B10/60

Abstract: An optical sampling arrangement for high-speed measurement of the time-varying electric field of an optical input signal utilizes coherent mixing of the optical input signal with a reference laser source in a phase-diverse optical hybrid solution, followed by optical sampling of the coherently-mixed fields at the output of the optical hybrid. The generated streams of optical samples are then detected and signal processed in order to reconstruct a sampled version of the electric field of the original optical input signal.

Abstract translation: 用于光输入信号的时变电场的高速测量的光学采样装置利用光输入信号与参考激光源在相位分集光混合解决方案中的相干混合 随后对光混合器的输出处的相干混合场进行光学采样。 然后检测产生的光学样本流并对其进行信号处理，以便重建原始光学输入信号的电场的采样版本。

公开(公告)号：WO2010043056A1

公开(公告)日：2010-04-22

申请号：PCT/CA2009/001493

申请日：2009-10-19

Applicant: EXFO ELECTRO-OPTICAL ENGINEERING INC. ,  PERRON, Stephane

Inventor： PERRON, Stephane

IPC: H04B10/08 ,  H04B10/20

CPC classification number: H04B10/0795 ,  H04J14/0282

Abstract: A method of distinguishing a wavelength-dependent reflective element (HRD) from wavelength-independent events in an optical network, the reflective element (HRD) being highly-reflective at a first predetermined wavelength (λ 1 ) and significantly less reflective at at least one other predetermined wavelength (λ 2 ), comprising the steps of: connecting the wavelength-dependent reflective element (HRD) to said optical path at a first position, and, using an optical time domain reflectometer (22) connected to said optical path at a position remote from said reflective element, launching into said optical path light at said first wavelength (λ 1 ) and at said second wavelength (λ 2 ), detecting corresponding backreflected light from said optical paths and obtaining therefrom first and second OTDR traces (OTDR-λ 1 ,OTDR-λ 2 ) corresponding to said first (λ 1 ) and second (λ 2 ) wavelengths, respectively, of detected backreflected light as a function of optical distance from said point; comparing the first and second OTDR traces to distinguish a peak corresponding to said wavelength-dependent reflective element from peaks corresponding to said wavelength-independent reflective events; and outputting at least one parameter value of the distinguished peak as a measure of a parameter of said wavelength-dependent reflective element.

Abstract translation: 一种在光网络中区分波长相关反射元件（HRD）与波长无关事件的方法，所述反射元件（HRD）在第一预定波长（λ1）下是高度反射的，并且在至少一个反射元件 其他预定波长（λ2），包括以下步骤：在第一位置处将波长相关反射元件（HRD）连接到所述光路，并且使用连接到所述光路的光时域反射计（22） 位于远离所述反射元件的位置，以所述第一波长（λ1）和所述第二波长（λ2）向所述光路中发射光，检测来自所述光路的相应的反射光，并从其获得第一和第二OTDR迹线（OTDR- 分别对应于所述第一（λ1）和第二（λ2）波长的检测的反射光的光束的距离; 比较第一和第二OTDR迹线以将对应于所述波长相关反射元件的峰值与对应于所述波长无关的反射事件的峰值区分开; 并输出所述识别峰值的至少一个参数值作为所述波长相关反射元件的参数的量度。

公开(公告)号：WO2007068111A2

公开(公告)日：2007-06-21

申请号：PCT/CA2006/002033

申请日：2006-12-18

Applicant: EXFO ELECTRO-OPTICAL ENGINEERING, INC. ,  HE, Gang ,  SCHINN, Gregory, Walter

Inventor： HE, Gang ,  SCHINN, Gregory, Walter

IPC: G01M11/00 ,  G02B6/255

CPC classification number: G01M11/33 ,  G02B6/255

Abstract: A method of estimating loss of a splice between first and second optical fibers spliced together by a mechanical splice or a mechanical splice-based connector having a portion through which light leaked from the splice can emerge comprises the steps of launching light into the first fiber, collecting light leaked from the portion using a multiplicity of ports, measuring the power level of the collected light and deriving the insertion loss from the measured power level, a predetermined power level and a collection factor C representing a relationship between measured power level, predetermined power level, power level of light in the first fiber, and power level of light coupled into the second fiber previously obtained for the same or similar connecting device. The ports may be angularly spaced about the axis of the connector or splice. The predetermined power level may be obtained by measuring light emerging from the connector but without the second fiber in position.

Abstract translation: 估计通过机械接头或机械接头连接器拼接在一起的第一和第二光纤之间的接头的损耗的方法，该连接器具有从接头泄漏光的部分可以出现的步骤包括将光发射到第一光纤中的步骤， 使用多个端口收集从该部分泄漏的光，测量所收集的光的功率电平并从测量的功率电平导出插入损耗，预定功率电平和表示测量功率电平，预定功率之间的关系的采集因子C 第一光纤中的光的功率水平，以及耦合到先前为相同或相似的连接装置获得的第二光纤的光的功率水平。 端口可以​​围绕连接器或接头的轴线成角度地间隔开。 可以通过测量从连接器出射的光而不使第二光纤处于适当位置来获得预定的功率水平。

公开(公告)号：WO2004070341A1

公开(公告)日：2004-08-19

申请号：PCT/CA2003/000151

申请日：2003-02-06

Applicant: EXFO ELECTRO-OPTICAL ENGINEERING INC. ,  CYR, Normand

Inventor： CYR, Normand

IPC: G01M11/00

CPC classification number: G01J4/04 ,  G01M11/331 ,  G01M11/336

Abstract: Apparatus for measuring polarization mode dispersion (PMD) of adevice, e. g. a waveguide, comprises a broadband light source (10,12) for passing polarized broadband light through the device (14), an interferometer (20) for dividing and recombining light that has passed through the device to form interferograms, a polarization separator (30) for receiving the light from the interferometer and separating such received light along first and second orthogonalFebruary 25, 2003February 25, 2003 polarization states, detectors (32 x ,32 y ) for converting the first and second orthogonal polarization states, respectively, into corresponding first and second electrical signals (P x (τ),P y (τ)), and a processor (36) for computing the modulus of the difference and such, respectively, of the first and second electrical signals to produce a cross-correlation envelope (E C (τ)) and an auto-correlation envelope (E c (τ)), and determining the polarization mode dispersion according to the expression PMD = where and τ is the delay difference between the paths of the interferometer.

Abstract translation: 用于测量装置的偏振模色散（PMD）的装置， G。 波导，包括用于使偏振宽带光通过装置（14）的宽带光源（10,12），用于分割和重新组合通过该装置的光以形成干涉图的干涉仪（20）;偏振分离器（30） ），用于从所述干涉仪接收光并将所述接收的光沿着第一和第二正交方向分离，2003年2月25日，2003年2月25日，偏振态，用于将第一和第二正交偏振态分别转换成相应的第一和第二相位的检测器（32x，32y） 电信号（Px（τ），Py（tau））和处理器（36），用于分别计算第一和第二电信号的差等的模数，以产生互相关包络（EC（τ ））和自相关包络（Ec（τ）），以及根据表达式PMD =确定偏振模色散，其中τ是干涉仪的路径之间的延迟差 。