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公开(公告)号：US20220286201A1
公开(公告)日：2022-09-08
申请号：US17580202
申请日：2022-01-20
Applicant: Nokia Solutions and Networks OY
Inventor： Mikael Mazur , Nicolas Fontaine
IPC: H04B10/07
Abstract: A fiber-optic communication system having two optical channels characterized by different respective group velocities. In an example embodiment, the system comprises an optical receiver capable of measuring a difference in the time of arrival thereto, by way of the two optical channels, of the corresponding signal disturbances caused by a remote ambient event, such as an earthquake or a lightning strike. A signal processor of the receiver can then use the measured time-of-arrival difference to estimate the distance, along the fiber, to the location of the remote ambient event. In some example embodiments, the two optical channels may be different wavelength channels or different spatial modes of a multimode fiber. In some example embodiments, at least one of the two channels may be a payload-data-bearing channel.
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公开(公告)号：US10715256B1
公开(公告)日：2020-07-14
申请号：US16290854
申请日：2019-03-01
Applicant: Nokia Solutions and Networks Oy
Inventor： Haoshuo Chen , Roland Ryf , Nicolas Fontaine
IPC: H04B10/556 , H04B10/61
Abstract: An apparatus includes an optical data receiver to receive a phase-modulated optical signal and to demodulate data therefrom. The optical data receiver includes an optical power splitter, first and second optical intensity detectors, and a digital signal processor. The digital signal processor is connected to receive digital values of intensity measurements of each of the optical intensity detectors. The first optical intensity detector is connected to receive light from the optical power splitter via a first optical path, and the second optical intensity detector is connected to receive light from the optical power splitter via a second optical path. The first and second optical paths have channel functions with different frequency dependencies.
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公开(公告)号：US11592354B2
公开(公告)日：2023-02-28
申请号：US17166799
申请日：2021-02-03
Applicant: Nokia Solutions and Networks OY
Inventor： Haoshuo Chen , Nicolas Fontaine
IPC: G01M11/00
Abstract: An OVNA system employing an array of reference delays to estimate distance-variant phase distortion in probe light during an optical-frequency sweep thereof. The estimated distance-variant phase distortion is then used to perform a phase correction for the digital electrical signals generated in response to the probe light being passed through a device under test (DUT) during the same optical-frequency sweep. Advantageously, the performed phase correction enables the OVNA system to provide a more-accurate determination of certain optical characteristics of the DUT than that achievable without such phase correction.
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公开(公告)号：US20220244136A1
公开(公告)日：2022-08-04
申请号：US17166799
申请日：2021-02-03
Applicant: Nokia Solutions and Networks OY
Inventor： Haoshuo Chen , Nicolas Fontaine
IPC: G01M11/00
Abstract: An OVNA system employing an array of reference delays to estimate distance-variant phase distortion in probe light during an optical-frequency sweep thereof. The estimated distance-variant phase distortion is then used to perform a phase correction for the digital electrical signals generated in response to the probe light being passed through a device under test (DUT) during the same optical-frequency sweep. Advantageously, the performed phase correction enables the OVNA system to provide a more-accurate determination of certain optical characteristics of the DUT than that achievable without such phase correction.
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公开(公告)号：US20250044129A1
公开(公告)日：2025-02-06
申请号：US18680937
申请日：2024-05-31
Applicant: Nokia Solutions and Networks Oy
Inventor： Mikael Mazur , Nicolas Fontaine
Abstract: A method and apparatus of OFDR are disclosed, in which a pair of probe signals are launched, on mutually orthogonal channels, into the optical fiber cable that is to be monitored. In a digital processing circuit, phase noise is cancelled from the return signals after detecting them in their respective mutually orthogonal channels and after demodulating them, by combining them such that noise components of the respective demodulated signals are mutually cancelled. In embodiments, a conjugate pair of probe signals are launched, on mutually orthogonal channels, into the optical fiber cable.
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Patent Agency Ranking
公开(公告)号：US20220163865A1
公开(公告)日：2022-05-26
申请号：US17104736
申请日：2020-11-25
Applicant: Nokia Solutions and Networks OY
Inventor： Haoshuo Chen , Nicolas Fontaine
Abstract: A WSS device in which a VIPA is used as a spectral disperser. In an example embodiment, the VIPA is configured to produce two or more diffraction orders on the LCOS micro-display of the WSS device. The LCOS micro-display is configurable to independently process light corresponding to different diffraction orders. For example, the LCOS micro-display may be used to implement: (i) optical-signal switching by applying different relative phase shifts to light of different diffraction orders to cause constructive interference at a selected one of the optical ports of the WSS device; (ii) optical-signal splitting by steering light of different diffraction orders to at least two different selected optical ports of the WSS device; and (iii) controllable optical-signal attenuation by applying different relative phase shifts to different diffraction orders to control the relative degree of constructive and destructive interference at a selected one of the optical ports of the WSS device.
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公开(公告)号：US12028154B2
公开(公告)日：2024-07-02
申请号：US17942881
申请日：2022-09-12
Applicant: Nokia Solutions and Networks Oy
Inventor： Haoshuo Chen , Nicolas Fontaine
Abstract: An apparatus includes a TDM PON optical transceiver including a direct-detection optical receiver. The direct-detection optical receiver is configured to demodulate data from a temporal segment of a data modulated optical signal, wherein the optical carrier frequency of the segment varies at a rate of, at least, 1 giga-Hertz per second.
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公开(公告)号：US11953802B2
公开(公告)日：2024-04-09
申请号：US17104736
申请日：2020-11-25
Applicant: Nokia Solutions and Networks OY
Inventor： Haoshuo Chen , Nicolas Fontaine
CPC classification number: G02F1/31 , G02B1/11 , G02B6/29367 , G02B6/2938 , G02B6/29395 , G02B17/004 , G02B27/0087 , G02F1/292 , G03H1/2294 , G02F2203/24 , G03H2225/22
Abstract: A WSS device in which a VIPA is used as a spectral disperser. In an example embodiment, the VIPA is configured to produce two or more diffraction orders on the LCOS micro-display of the WSS device. The LCOS micro-display is configurable to independently process light corresponding to different diffraction orders. For example, the LCOS micro-display may be used to implement: (i) optical-signal switching by applying different relative phase shifts to light of different diffraction orders to cause constructive interference at a selected one of the optical ports of the WSS device; (ii) optical-signal splitting by steering light of different diffraction orders to at least two different selected optical ports of the WSS device; and (iii) controllable optical-signal attenuation by applying different relative phase shifts to different diffraction orders to control the relative degree of constructive and destructive interference at a selected one of the optical ports of the WSS device.
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公开(公告)号：US20220271859A1
公开(公告)日：2022-08-25
申请号：US17180455
申请日：2021-02-19
Applicant: Nokia Solutions and Networks Oy
Inventor： Haoshuo Chen , Nicolas Fontaine , David Neilson
Abstract: Various example embodiments for a wavelength selective switch including a direct grating interface are presented. In at least some example embodiments, a wavelength selective switch may include a light propagating element having a tilted fiber grating integrated therein, thereby providing a direct grating interface to the light propagating element. It is noted that use of such a direct grating interface may obviate the need for use of various components typically utilized within wavelength selective switches (e.g., front-end optics in the port direction, front-end optics and diffractive gratings in the wavelength direction, and so forth), thereby enabling the size of wavelength selective switches to be reduced or even for the wavelength selective switches to be made compact or even ultra-compact.
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公开(公告)号：US11184086B1
公开(公告)日：2021-11-23
申请号：US16943782
申请日：2020-07-30
Applicant: Nokia Solutions and Networks Oy
Inventor： Haoshuo Chen , Nicolas Fontaine
IPC: H04B10/077 , H04B10/03 , H04B10/67 , H04B10/69 , H04J14/06 , H04B10/548
Abstract: An apparatus includes a direct-detection optical data receiver to receive a data-modulated optical carrier. The direct-detection optical data receiver includes an optical power splitter, an array of at least three optical intensity detectors, and a digital signal processor. The digital signal processor is connected to receive digital values of intensity measurements of each of the optical intensity detectors of the array and to recover data of the received data-modulated optical signal from the digital values of the intensity measurements. The first optical intensity detector is connected to receive light from the optical power splitter via a dispersive optical path and the remaining of the optical intensity detectors of the array are connected to receive light from the optical power splitter via a multiple input and multiple output passive optical processing unit. The passive optical processing unit is configured to optically mix light received on different optical inputs thereof.
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