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

公开(公告)号：EP4343292A3

公开(公告)日：2024-06-05

申请号：EP24151043.7

申请日：2023-07-04

申请人： EXFO Inc.

发明人： CHEN, Hongxin ,  LEBLANC, Michel ,  LECLERC, Michel ,  CYR, Normand

IPC分类号： G01H9/00

CPC分类号： G01H9/004

摘要： There is provided a method and an apparatus of fiber optic distributed acoustic sensing (DAS) which can use low-cost coherent laser as well as low-cost acquisition and processing electronics and which can still provide reliable monitoring results for optical fiber monitoring and troubleshooting applications in optical fiber telecommunication networks. Such low-cost solution is made possible by employing grouped data signal processing. Data is processed over independent groups of data to provide an independent DAS signal for each group. This allows measurements to be less sensitive to laser fluctuations and thereby reduces coherent laser technical specification requirements and allows the use of a low-cost coherent laser (thereby reducing the cost of the laser) as well as low-cost acquisition and processing electronics.

公开(公告)号：EP4343292A2

公开(公告)日：2024-03-27

申请号：EP24151043.7

申请日：2023-07-04

申请人： EXFO Inc.

发明人： CHEN, Hongxin ,  LEBLANC, Michel ,  LECLERC, Michel ,  CYR, Normand

IPC分类号： G01H9/00

摘要： There is provided a method and an apparatus of fiber optic distributed acoustic sensing (DAS) which can use low-cost coherent laser as well as low-cost acquisition and processing electronics and which can still provide reliable monitoring results for optical fiber monitoring and troubleshooting applications in optical fiber telecommunication networks. Such low-cost solution is made possible by employing grouped data signal processing. Data is processed over independent groups of data to provide an independent DAS signal for each group. This allows measurements to be less sensitive to laser fluctuations and thereby reduces coherent laser technical specification requirements and allows the use of a low-cost coherent laser (thereby reducing the cost of the laser) as well as low-cost acquisition and processing electronics.

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

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.