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1. 发明公开

EP4418569A1 METHODS AND SYSTEMS FOR CHARACTERIZATION OF POLARIZATION-DEPENDENT LOSS OR GAIN IN OPTICAL LINKS AND COMPONENTS 审中-公开
公开(公告)号：EP4418569A1
公开(公告)日：2024-08-21
申请号：EP24155835.2
申请日：2024-02-05
申请人： EXFO Inc.
发明人： HE, Gang
IPC分类号： H04B10/079 , G01M11/00 , H04B10/2569
CPC分类号： H04B10/07953 , H04B10/2569 , G01M11/337
摘要： Methods and systems are disclosed for characterizing a polarization-dependent loss or gain (PDL/G) of an optical device under test (DUT), such as an optical fiber link, from an optical signal having passed through the optical DUT. The optical signal is substantially unpolarized upon entering the optical DUT. The method can include varying a state of polarization (SOP) of the optical signal over a plurality of sampled SOP conditions to produce a respective plurality of SOP-varied optical signals; performing a polarization-analysis and detection operation on the plurality of SOP-varied optical signals to acquire a respective plurality of detected signal sets, each detected signal set including at least one polarization-analyzed detected signal; and determining, as the PDL/G of the optical DUT, a polarization extinction ratio parameter representative of a ratio of maximum to minimum power levels measured among the polarization-analyzed detected signals of the plurality of detected signal sets.

2. 发明授权

EP2486678B1 REFERENCE-BASED IN-BAND OSNR MEASUREMENT ON POLARIZATION-MULTIPLEXED SIGNALS 有权转让
公开(公告)号：EP2486678B1
公开(公告)日：2018-08-15
申请号：EP11741802.0
申请日：2011-02-14
申请人： EXFO INC.
发明人： GARIEPY, Daniel , HE, Gang
IPC分类号： H04B10/079
CPC分类号： H04B10/07953
摘要： There is provided a method for determining an in-band noise parameter, such as the Optical Signal-to-Noise Ratio (OSNR), on an optical signal-under-test (SUT) propagating along an optical communication link and comprising a data-carrying signal contribution of any arbitrary degree of polarization and a noise contribution. A spectral shape trace of data-carrying signal contribution in the SUT is estimated using a reference optical spectrum trace of a reference signal which comprises a data-carrying signal contribution that is spectrally representative of the data-carrying signal contribution of the SUT and a noise contribution which is at least approximately known. The data-carrying signal contribution is mathematically discriminated from said noise contribution in the SUT using the spectral shape trace and the test optical spectrum trace. The in-band noise parameter is then determined at least from the mathematically discriminated noise contribution.

3. 发明公开

EP3616336A1 NOISE-FREE MEASUREMENT OF THE SPECTRAL SHAPE OF A MODULATED SIGNAL USING SPECTRAL CORRELATION 有权
公开(公告)号：EP3616336A1
公开(公告)日：2020-03-04
申请号：EP18791589.7
申请日：2018-04-06
申请人： EXFO Inc.
发明人： CYR, Normand , HE, Gang , RUCHET, Bernard
IPC分类号： H04B10/07

4. 发明公开

EP2676384A1 CHARACTERIZATION OF NON-ASE NOISE ON OPTICAL SIGNALS 有权转让
标题翻译：特拉华州的非ASE-RAUSCHEN在OPTISCHEN SIGNALEN
公开(公告)号：EP2676384A1
公开(公告)日：2013-12-25
申请号：EP12747668.7
申请日：2012-02-16
申请人： Exfo Inc.
发明人： HE, Gang , GARIEPY, Daniel , CHEN, Hongxin , RUCHET, Bernard
IPC分类号： H04B10/08
CPC分类号： H04B10/073 , H04B10/0775 , H04B10/07953 , H04J14/02 , H04J14/06
摘要： There is provided a method for determining a noise parameter characterizing an optical Signal-Under-Test (SUT) having a signal contribution, an Amplified Spontaneous Emission (ASE) noise contribution and a non-ASE optical noise contribution, such as a carrier-leakage contribution or a depolarized-signal contribution, within an optical-signal bandwidth. The method comprises acquiring optical spectrum trace(s) of the SUT, discriminating at least the non-ASE optical noise contribution from the ASE-noise contribution using the optical spectrum trace(s) and/or a trace obtained from the optical spectrum trace(s); and determining the noise parameter using discriminated non-ASE optical noise contribution and/or the discriminated ASE-noise contribution.
摘要翻译：提供了一种用于确定表征具有信号贡献，放大自发发射（ASE）噪声贡献和非ASE光学噪声贡献的光信号不足（SUT）的噪声参数的方法，例如载波泄漏贡献或去极化信号贡献，在光信号带宽内。该方法包括获取SUT的光谱轨迹，使用光谱轨迹和/或从光谱轨迹获得的轨迹，从ASE噪声贡献中至少区分非ASE光学噪声贡献或多个）; 以及使用识别的非ASE光学噪声贡献和/或所识别的ASE噪声贡献来确定噪声参数。

5. 发明公开

EP2486678A1 REFERENCE-BASED IN-BAND OSNR MEASUREMENT ON POLARIZATION-MULTIPLEXED SIGNALS 有权转让
标题翻译：参考基带INTERNAL OSNR测量由偏振复用信号
公开(公告)号：EP2486678A1
公开(公告)日：2012-08-15
申请号：EP11741802.0
申请日：2011-02-14
申请人： Exfo Inc.
发明人： GARIEPY, Daniel , HE, Gang
IPC分类号： H04B10/08
CPC分类号： H04B10/07953
摘要： There is provided a method for determining an in-band noise parameter, such as the Optical Signal-to-Noise Ratio (OSNR), on an optical signal-under-test (SUT) propagating along an optical communication link and comprising a data-carrying signal contribution of any arbitrary degree of polarization and a noise contribution. A spectral shape trace of signal contribution in the SUT is estimated using a reference optical spectrum trace of a reference signal which comprises a signal contribution that is spectrally representative of the signal contribution of the SUT and a noise contribution which is at least approximately known. The signal contribution is mathematically discriminated from said noise contribution in the SUT using the spectral shape trace and the test optical spectrum trace. The in-band noise parameter is then determined at least from the mathematically discriminated noise contribution.

6. 发明授权

EP2467955B1 IN-BAND OPTICAL NOISE MEASUREMENT USING DIFFERENTIAL POLARIZATION RESPONSE 有权转让
公开(公告)号：EP2467955B1
公开(公告)日：2019-01-16
申请号：EP10809409.5
申请日：2010-08-19
申请人： EXFO Inc.
发明人： HE, Gang , CYR, Normand
IPC分类号： H04B10/07

7. 发明公开

EP3018839A1 IN-BAND NOISE AND/OR SPECTRAL DEFORMATION MEASUREMENT ON POLARIZATION-MULTIPLEXED SIGNALS 有权转让
标题翻译： IN-BAND MESSUNG VON RAUSCHEN UND / ODER SPEKTRALER DEFORMATION AUF POLARISATIONSMULTIPLEXTEN SIGNALEN
公开(公告)号：EP3018839A1
公开(公告)日：2016-05-11
申请号：EP15192157.4
申请日：2015-10-29
申请人： Exfo Inc.
发明人： HE, Gang , GARIEPY, Daniel
IPC分类号： H04B10/077 , H04B10/079
摘要： There is provided a method to discriminate NLE-induced signal deformation from ASE-noise on polarization multiplexed signals, in order to measure the OSNR under NLE conditions and/or characterize the NLE-induced signal deformation. In accordance with one aspect, the method is based on the acquisition of optical spectrum traces when the (data-carrying) optical communication signal is partially or completely extinguished (ASE-noise only), as well as with a live optical communication signal. Comparing traces acquired with different conditions and/or at different dates allows discrimination of the signal contribution, the ASE-noise contribution and the NLE-induced deformations on the SUT.
摘要翻译：提供了一种在偏振复用信号上区分NLE引起的信号变形与ASE噪声的方法，以便在NLE条件下测量OSNR和/或表征NLE引起的信号变形。根据一个方面，该方法基于当（数据携带）光通信信号被部分或完全熄灭（仅ASE-噪声）以及带有实时光通信信号时的光谱踪迹的获取。比较不同条件和/或不同日期获取的踪迹可以区分信号贡献，ASE噪声贡献和NLE引起的SUT变形。

8. 发明公开

EP2467955A1 IN-BAND OPTICAL NOISE MEASUREMENT USING DIFFERENTIAL POLARIZATION RESPONSE 有权转让
标题翻译： BAND内部光学噪声测试中使用不同的极化反应的
公开(公告)号：EP2467955A1
公开(公告)日：2012-06-27
申请号：EP10809409.5
申请日：2010-08-19
申请人： Exfo Inc.
发明人： HE, Gang , CYR, Normand
IPC分类号： H04B10/08
CPC分类号： H04B10/07953
摘要： A method comprises : acquiring, for a number nSOP of varied State-Of-Polarization analysis conditions of the input optical signal, nSOP polarization-analyzed optical spectrum traces, the distribution of said SOP analysis conditions being approximately known; mathematically discriminating said signal contribution from said noise contribution within said optical signal bandwidth using said polarization-analyzed optical spectrum traces, said mathematically discriminating comprising : obtaining a differential polarization response that is related to the optical spectrum of said signal contribution by a constant of proportionality; estimating the constant of proportionality of a differential polarization response to the optical spectrum of said signal contribution as a function of said number nSOP; estimating the optical spectrum of said noise contribution from said input optical signal, within said optical signal bandwidth using said constant of proportionality and said differential polarization response; and determining said in-band noise parameter on said input optical signal from the mathematically discriminated noise contribution.

9. 发明授权

EP3018839B1 IN-BAND NOISE AND/OR SPECTRAL DEFORMATION MEASUREMENT ON POLARIZATION-MULTIPLEXED SIGNALS 有权转让
公开(公告)号：EP3018839B1
公开(公告)日：2020-01-15
申请号：EP15192157.4
申请日：2015-10-29
申请人： EXFO Inc.
发明人： HE, Gang , GARIEPY, Daniel
IPC分类号： H04B10/077 , H04B10/079

10. 发明授权

EP2140586B1 METHOD AND SYSTEM FOR DETERMINING IN-BAND OPTICAL NOISE 有权转让
公开(公告)号：EP2140586B1
公开(公告)日：2018-05-30
申请号：EP08733726.7
申请日：2008-04-04
申请人： EXFO INC.
发明人： GARIEPY, Daniel , HE, Gang , BRETON, Yves
IPC分类号： H04J14/02 , H04B10/079
CPC分类号： H04B10/07953
摘要： 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.

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