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91. 发明公开

EP0605116A2 Depolariser for optical components in optical transmission system 失效
标题翻译：消偏振器用于在光传输系统中的光学部件。
公开(公告)号：EP0605116A2
公开(公告)日：1994-07-06
申请号：EP93309761.0
申请日：1993-12-06
申请人： AT&T Corp.
发明人： Nyman, Bruce Mitchell , Wolter, Gregory Michael
IPC分类号： G01M11/00
CPC分类号： G01M11/337 , G01M11/333 , H04B10/2572
摘要： Previous efforts to measure polarization dependent loss of optical components have been limited in uncertainty to more than 0.01 dB. This is because the power meter used in a test set contains polarization dependent loss which adversely affects the final readings. It is here disclosed that an unpumped erbium doped fiber (36) can convert a received polarized signal into unpolarized amplified spontaneous emission of a longer wavelength if the fiber is of sufficient length to absorb the received signal. By locating the inventive unpumped erbium doped fiber upstream of the power meter (38) of a test set, the polarized signal to the power meter is converted to an unpolarized signal and, therefore, the polarization dependent loss of the power meter can not influence the measurement obtained.

92. 发明公开

KR1020030081109A 편광계의 고정밀 교정 有权
标题翻译：旋光仪的高精度校准
公开(公告)号：KR1020030081109A
公开(公告)日：2003-10-17
申请号：KR1020030022280
申请日：2003-04-09
申请人： 쏘어랩스 인코포레이티드
发明人： 에그베르트크라우제 , 아달베르트반데머
IPC分类号： G01J4/04
CPC分类号： G01M11/337 , G01J4/04 , G01M11/336
摘要： 최소한 4개의 검출기를 갖는 유형의 고정밀 편광계 교정 방법은 4개의 공지된 편광 상태의 입력 광 신호(교정 편광) 및 최소한 하나의 추가의 편광 상태를 이용하는 단계를 포함한다. 편광계에 대한 모든 입력 편광 상태는 광 신호의 단일의 정규화된 파워 및 단일의 편광도를 갖는다. 4개의 교정 편광을 위한 스토크스 행렬(Stokes matrix)은 최소한 하나의 보정 파라미터에 의해 생성되고, 보정 행렬은 상기 스토크스 행렬 및 편광계에 의해 측정되는 대응 검출기 전류로부터 결정된다. 편광계에 의해 측정됨으로써 상기 편광 상태에 대한 편광도의 함수인 최적화 기준이 생성된다. 보정 파라미터는 상기 최적화 기준을 최소화하기 위해 반복적으로 변화하여 상기 편광계는 임의의 입력 편광 상태에 대하여 단일의 파워 및 편광도를 형성하도록 교정된다.

93. 发明公开

KR1020020073750A 반복적인 고속 편광 스크램블링을 이용한 편광의존성 손실측정장치 및 방법 有权
标题翻译：使用重复的高速极化扫描测量极化依赖性损失的装置和方法
公开(公告)号：KR1020020073750A
公开(公告)日：2002-09-28
申请号：KR1020010013540
申请日：2001-03-16
申请人： (주)파이버프로
发明人： 이봉완 , 김정원 , 고연완
IPC分类号： G02B5/30 , G01J4/00
CPC分类号： G01M11/337 , G02B6/105
摘要： PURPOSE: An apparatus and a method for measuring a polarization dependent loss using a repetitive high speed polarization scrambling are provided, which reduces an opportunity of a disturb generation in a polarization of an input light by completing a measurement within a fast time, and measures a polarization dependent loss with an all state scanning method using a polarization modulator having a modulation speed above several kHz. CONSTITUTION: The apparatus for measuring a polarization dependent loss comprises a light source(302), and a polarizer(306) making a polarized light from a light from the light source. A polarization scrambler(310) includes fiber birefringent modulators comprising at least three cylindrical piezoelectric devices and optical fibers, and AC voltage sources applying an AC voltage of a frequency corresponding to a product of a fixed frequency(F) and an integer and being synchronized to one clock, and receives the polarized light as an input light from the polarizer and outputs an output light having a polarization state repeated with a frequency F. A light detector detects an output light of the polarization scramble after it passes through an object to be measured. An analog-digital converter is synchronized to clocks of the birefringent modulators and provides an intensity of the passing light at every period. And a digital signal processor part suppresses noise followed at every measurement by averaging an intensity change waveform of the passing light at every period from the analog-digital converter.
摘要翻译：目的：提供一种使用重复的高速偏振加扰来测量偏振相关损耗的装置和方法，其通过在快速时间内完成测量来减少输入光的偏振中的干扰产生的机会，并且测量使用具有高于几kHz的调制速度的偏振调制器的全状态扫描方法的偏振相关损耗。构成：用于测量偏振相关损耗的装置包括光源（302）和偏振器（306），其从来自光源的光产生偏振光。偏振加扰器（310）包括光纤双折射调制器，其包括至少三个圆柱形压电器件和光纤，AC电压源施加与固定频率（F）和整数的乘积相对应的频率的AC电压，并与一个时钟，并且接收来自偏振器的偏振光作为输入光，并输出具有以频率F重复的偏振状态的输出光。光检测器在经过被测量物体之后检测偏振加扰的输出光。模拟数字转换器与双折射调制器的时钟同步，并在每个周期提供通过光的强度。并且数字信号处理器部分通过对来自模数转换器的每个周期的通过光的强度变化波形进行平均，来抑制每次测量时的噪声。

94. 发明授权

US12038346B2 Techniques for providing a swept wavelength (SW) measurement for acquiring polarization dependent loss (PDL) in a single scan 有权
公开(公告)号：US12038346B2
公开(公告)日：2024-07-16
申请号：US17341261
申请日：2021-06-07
申请人： VIAVI SOLUTIONS INC.
发明人： Luis Andre Neves Paiva Fernandes , Robert Matthew Adams , Christopher Russell Wagner , Joshua Benjamin Julius Philipson , Eugene Chan
IPC分类号： G01M11/00 , G02F1/01
CPC分类号： G01M11/337 , G02F1/0139
摘要： According to examples, a system for measuring polarization dependent loss (PDL) for a device-under-test (DUT) may include a tunable laser, a polarization element and a power meter. The tunable laser may emit an optical signal to sweep across an optical band at a constant rate. The polarization element may scramble polarizations states of the optical signal emitted from the tunable laser. The power meter may take power measurements associated with the optical signal emitted from the tunable laser, wherein the power measurements from the power meter are used to determine a maximum insertion loss (IL) and a minimum insertion loss (IL) associated with the device-under-test (DUT). An average insertion loss (IL) and a polarization dependent loss (PDL) for the device-under-test (DUT) may be calculated based on the maximum insertion loss (IL) and the minimum insertion loss (IL) associated with the device-under-test (DUT).

95. 发明公开

US20240007187A1 RECEIVER-BASED FIBER-OPTIC LINK MONITOR 审中-公开
公开(公告)号：US20240007187A1
公开(公告)日：2024-01-04
申请号：US18341427
申请日：2023-06-26
申请人： Nokia Solutions and Networks Oy
发明人： Paolo SERENA , Chiara Lasagni , Alberto Bononi , Matteo Lonardi , Petros Ramantanis , Amirhossein Ghazisaeidi
IPC分类号： H04B10/2513 , G01M11/00 , H04B10/079 , H04B10/61
CPC分类号： H04B10/2513 , G01M11/338 , G01M11/337 , H04B10/07951 , H04B10/61
摘要： A digital processor (DP) is configured to obtain a temporal sequence of digital phase distortion measurements of a first optical signal received by a coherent optical receiver (COR) from an optical fiber link, where the first optical signal co-propagates with a second, power-modulated, optical signal in different frequency channels. The DP is configured to estimate a cross-correlation between the temporal sequence of digital measurements and a temporal sequence of powers of the second optical signal for a plurality of relative time shifts between the sequences, and to identify a location along the optical fiber link based on a magnitude of the cross-correlation exceeding a threshold for a particular time shift.

96. 发明授权

US11644381B2 Polarization dependent loss measurement 有权
公开(公告)号：US11644381B2
公开(公告)日：2023-05-09
申请号：US17314228
申请日：2021-05-07
申请人： EXFO Optics, SAS
发明人： Normand Cyr , Bernard Ruchet
IPC分类号： G01M11/00
CPC分类号： G01M11/337 , G01M11/331
摘要： There is provided a method for measuring the PDL of a DUT as a function of the optical frequency ν within a spectral range, which uses a single wavelength scan over which the input-SOP varies in a continuous manner. The power transmission through the DUT, curve T(ν), is measured during the scan and the PDL is derived from the sideband components of the power transmission curve T(ν) that results from the continuously varying input-SOP. More specifically, the Discrete Fourier Transform (DFT) of the power transmission curve T(ν) is calculated, wherein the DFT shows at least two sidebands. At least two sidebands are extracted and their inverse DFT calculated individually to obtain complex transmissions (ν), =−J . . . J, where J is the number of sidebands on one side. The response vector |m(ν) of the DUT is derived from the complex transmissions (ν) and a matrix determined by the continuous trajectory of the SOP of the input test lightwave; and the PDL of the DUT as a function of ν (PDL curve) is derived therefrom.

97. 发明申请

US20180266918A1 OPTICAL CONNECTOR POLARITY AND LOSS MEASUREMENT USING AN INTEGRATING SPHERE-EQUIPPED OPTICAL MEASUREMENT DEVICE 审中-公开
公开(公告)号：US20180266918A1
公开(公告)日：2018-09-20
申请号：US15865003
申请日：2018-01-08
申请人： Fluke Corporation
发明人： J. David Schell , Seymour Goldstein , Piotr Anatolij Levin
IPC分类号： G01M11/00
CPC分类号： G01M11/337 , G01M11/3181 , G01M11/35 , G02B6/42 , H04B10/07955
摘要： An integrating sphere-equipped optical measurement device and optical connector polarity and type identification and loss measurement are provided. The optical measurement device includes at least two photodetectors that are optically responsive over different ranges of wavelengths. The optical measurement device receives one or more optical signals emanate from optical fibers of an optical fiber cable. The optical measurement device determines an optical intensity or loss of the one or more optical signals based on a measurement made by a corresponding photodetector whose responsivity range includes a wavelength of the one or more optical signals. The optical measurement device determines one or more respective positions where the one or more optical signals impinged on a sensor. The optical measurement device determines a polarity of the optical fiber cable based on both the one or more positions and one or more or transmitting positions of the one or more optical signals, respectively.

98. 发明授权

US09031403B2 Optical transmission system and method for monitoring polarization dependent characteristics of optical transmission line 有权
标题翻译：用于监测光传输线偏振相关特性的光传输系统及方法
公开(公告)号：US09031403B2
公开(公告)日：2015-05-12
申请号：US13915675
申请日：2013-06-12
申请人： Fujitsu Limited
发明人： Hisao Nakashima , Takeshi Hoshida
IPC分类号： H04B10/08 , H04B10/04 , H04B10/06 , G01N21/00 , H04B10/07 , G01M11/00 , H04B10/079
CPC分类号： H04B10/07 , G01M11/336 , G01M11/337 , H04B10/07951
摘要： A method includes sweeping an optical frequency of an optical signal by an optical transmitter controlling an electric-field information signal corresponding to a transmitted signal, providing different polarization states for individual frequencies of the optical signal by the optical transmitter controlling a mixture of a first electric-field information signal corresponding to a first transmitted signal and a second electric-field information signal corresponding to a second transmitted signal, obtaining, for individual frequencies of the optical signal, polarization dependent characteristics corresponding to different frequencies, when the optical transmitter sweeps the frequency of the optical signal, by an optical receiver calculating a polarization-dependent characteristic of an optical transmission line between the optical transmitter and the optical receiver, based on items of received-electric-field information corresponding to the different polarization states, and obtaining statistical information of a polarization state of the optical transmission line, based on the polarization dependent characteristics, with the optical receiver.
摘要翻译：一种方法包括通过控制与发射信号相对应的电场信息信号的光发射机来扫描光信号的光频，由光发射机为光信号的各个频率提供不同的极化状态，控制第一电对应于第一发射信号的场信息信号和对应于第二发射信号的第二电场信息信号，当光发射机扫描频率时，为光信号的各个频率获得对应于不同频率的偏振相关特性根据与不同极化状态对应的接收电场信息的项目，通过计算光发射机与光接收机之间的光传输线的偏振相关特性的光接收机获得光信号，并获得基于偏振相关特性的光传输线的偏振状态与光接收机的统计信息。

99. 发明授权

US07202944B2 Determining measuring uncertainty or error of a PDL-tester 失效
标题翻译：确定PDL测试仪的测量不确定度或误差
公开(公告)号：US07202944B2
公开(公告)日：2007-04-10
申请号：US10503285
申请日：2002-07-16
申请人： Gregor Cedilnik
发明人： Gregor Cedilnik
IPC分类号： G01N21/00
CPC分类号： G01M11/337
摘要： Determining a measuring uncertainty and/or maximum measuring error of a polarization dependent loss—PDL—tester for determining a PDL value of a device under test—DUT—is provided by using the PDL tester for determining a value of PDL of a verification element having an actual value of PDL greater than a maximum value of a specified measuring range, wherein the PDL tester has an expected measuring uncertainty and/or expected maximum measuring error. The measuring uncertainty and/or maximum measuring error or the tester is then derived from the determined value of PDL of the verification element in conjunction with the actual value of PDL of the verification element.
摘要翻译：通过使用PDL测试仪确定用于确定被测器件的PDL值的偏振相关损耗PDL测试仪的测量不确定度和/或最大测量误差，以确定具有 PDL的实际值大于指定测量范围的最大值，其中PDL测试仪具有预期的测量不确定性和/或预期的最大测量误差。测量不确定度和/或最大测量误差或测试仪然后从验证元件的PDL的确定值结合验证元件的PDL的实际值导出。

100. 发明申请

US20050174577A1 Heterodyne optical network analysis that utilizes signal modulation 失效
标题翻译：利用信号调制的异步光网络分析
公开(公告)号：US20050174577A1
公开(公告)日：2005-08-11
申请号：US10772808
申请日：2004-02-05
申请人： Bogdan Szafraniec
发明人： Bogdan Szafraniec
IPC分类号： G01M11/02 , G01M11/00 , G01B9/02
CPC分类号： G01M11/337 , G01M11/331 , G01M11/333 , G01M11/336
摘要： The group delay of a DUT is measured by modulating test and reference portions of a local oscillator signal at different frequencies to create modulation sidebands, applying the modulated test portion of the local oscillator signal to the DUT, and then optically mixing the two modulated signals. Optically mixing the two modulated signals translates the optical frequencies down to electrical frequencies. Phase changes that are caused by the DUT are determined by measuring the phase differences between modulation sidebands of the test portion of the local oscillator signal. Frequency translation can be achieved by electrical mixing instead of optical mixing.
摘要翻译： DUT的组延迟通过调制不同频率的本地振荡器信号的测试和参考部分来测量，以产生调制边带，将本地振荡器信号的调制测试部分应用于DUT，然后光混合两个调制信号。将两个调制信号进行光学混合将光频率转换为电频率。由DUT引起的相位变化通过测量本地振荡器信号的测试部分的调制边带之间的相位差来确定。频率转换可以通过电气混合而不是光学混合来实现。

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