公开(公告)号：US10018785B2

公开(公告)日：2018-07-10

申请号：US14301646

申请日：2014-06-11

Applicant: EXFO Inc.

Inventor： Remi Fortin ,  Gang He

IPC: G02B6/00 ,  G02B6/26 ,  G02B6/028 ,  G02B6/14

CPC classification number: G02B6/268 ,  G02B6/0281 ,  G02B6/0288 ,  G02B6/14

Abstract: There is provided a modal distribution conditioner comprising the combination of a mandrel-wrapped optical fiber and an adjustable and fixable loop of optical fiber. It is noted that light entering the modal distribution conditioner is to be generally overfilled compared with the target encircled flux function (as defined by the Standard). The mandrel wrapping introduces macrobends to the optical fiber, inducing modal pre-filtering that roughly transforms the initially overfilled modal distribution to be close to compliance with the appropriate Standard. However, the modal distribution of light having traversed the fixed mandrel typically remains somewhat overfilled. The adjustable loop provides for the fine-tuning of the modal distribution, in conformity with the Standard. Once the requirements defined by the Standard are met, the adjustable loop may be secured in place such that modal distribution becomes fixed and remain stable.

公开(公告)号：US09954610B2

公开(公告)日：2018-04-24

申请号：US14932375

申请日：2015-11-04

Applicant: EXFO INC.

Inventor： Gang He ,  Daniel Gariepy

IPC: H04B10/079

CPC classification number: H04B10/07953

Abstract: There are provided methods and devices for determining a quality parameter characterizing an optical communication signal, the methods being performed by signal detection devices. At the transmitting end, there are obtained a signal power P1 of a first optical signal, a signal power P2 of a second optical signal, a signal power P3 of a third optical signal, optionally a signal power P4 of a fourth optical signal, and a total signal power Ps of a channel where the first, second, third and optional fourth optical signals are located. At a detection point, there are further obtained a signal power P1′ of the first optical signal, a signal power P2′ of the second optical signal, a signal power P3′ of the third optical signal and optionally a signal power P4′ of the fourth optical signal. There are then determined a signal deformation factor SDF and/or an optical signal to ASE noise ratio OSNR from the obtained signal powers.

公开(公告)号：US09438336B2

公开(公告)日：2016-09-06

申请号：US13965823

申请日：2013-08-13

Applicant: EXFO INC.

Inventor： Gang He ,  Daniel Gariepy ,  Hongxin Chen ,  Bernard Ruchet

IPC: H04B10/073 ,  H04J14/02 ,  H04J14/06 ,  H04B10/079

CPC classification number: H04B10/073 ,  H04B10/0775 ,  H04B10/07953 ,  H04J14/02 ,  H04J14/06

Abstract: 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.

Abstract translation: 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来区分来自ASE-噪声贡献的至少非ASE光学噪声贡献（和 s）; 以及使用鉴别的非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。

公开(公告)号：US08787753B2

公开(公告)日：2014-07-22

申请号：US13717113

申请日：2012-12-17

Applicant: Exfo Inc.

Inventor： Daniel Gariepy ,  Gang He ,  Yves Breton

IPC: H04B10/08

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 (e.g. 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（例如观察到的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：US20130163987A1

公开(公告)日：2013-06-27

申请号：US13717113

申请日：2012-12-17

Applicant: EXFO INC.

Inventor： Daniel Gariepy ,  Gang He ,  Yves Breton

IPC: H04B10/08

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 (e.g. 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（例如观察到的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。