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1. 发明授权

US11368216B2 Use of band-pass filters in supervisory signal paths of an optical transport system 有权
公开(公告)号：US11368216B2
公开(公告)日：2022-06-21
申请号：US16613274
申请日：2018-03-16
申请人： Alcatel Submarine Networks
发明人： Omar Ait Sab , Ludivine Moirot
IPC分类号： H04B10/07 , H04B10/077 , H04B10/25 , H04B10/27 , H04B10/297 , H04J14/02 , G01M11/00 , H04B10/071 , H04B10/29
摘要： A bidirectional optical repeater having two unidirectional optical amplifiers and a supervisory optical circuit connected to optically couple the optical ports thereof. In an example embodiment, the supervisory optical circuit provides one or more pathways therethrough for supervisory optical signals, each of these pathways having located therein a respective narrow band-pass optical filter. The supervisory optical circuit further provides one or more pathways therethrough configured to bypass the corresponding narrow band-pass optical filters in a manner that enables backscattered light of any wavelength to cross into the optical path that has therein the unidirectional optical amplifier directionally aligned with the propagation direction of the backscattered light.

2. 发明申请

US20220182138A1 SUPERVISION OF AN OPTICAL PATH INCLUDING AN AMPLIFIER 有权
公开(公告)号：US20220182138A1
公开(公告)日：2022-06-09
申请号：US17542719
申请日：2021-12-06
申请人： Alcatel Submarine Networks
发明人： Hans BISSESSUR , Omar AIT SAB
IPC分类号： H04B10/077 , H04B10/291 , H04B10/079
摘要： Various example embodiments for supporting supervision in optical communication systems are presented. Various example embodiments for supporting supervision in optical communication systems may be configured to support supervision of an optical path including a remote optically pumped amplifier (ROPA) and, thus, supervision of the ROPA. Various example embodiments for supporting supervision of an optical path including a ROPA may be configured to support supervision of the optical path including the ROPA based on a pair of optical supervisory paths configured to extract a pair of optical supervisory signals from an optical path in a first direction and to insert the pair of optical supervisory signals into an optical path in a second direction. Various example embodiments for supporting supervision of an optical path including a ROPA may be configured to support supervision of the optical path including the ROPA based on a pair of optical time-domain reflectometer (OTDR) paths.

3. 发明申请

US20210343141A1 MONITORING EQUIPMENT FOR CABLES 有权
公开(公告)号：US20210343141A1
公开(公告)日：2021-11-04
申请号：US17306224
申请日：2021-05-03
申请人： Alcatel Submarine Networks
发明人： Mathieu Duval , Thierry Verhaege , Alain Cordier
IPC分类号： G08C19/00
摘要： In certain embodiments, an assembly has intermediate pods magnetically, but not galvanically, coupled along an electrically conductive cable. Each pod has a magnetic core surrounding and inductively coupled to the cable and one or more coils inductively coupled to the magnetic core. The pod transmits, for example, outgoing current pulses on the cable by inducing electrical signals in the cable using a transmitter coil and the magnetic core. In addition, the pod repeats, for example, incoming current pulses on the cable by inducing electrical signals in the cable using the transmitter coil and the magnetic core, based on electrical signals induced in a receiver coil via the magnetic core by the incoming current pulses. Such an assembly can function as a data collection system for scientific research and/or as an early-warning system for events, such as earthquakes and tsunamis, without having to modify the cable itself.

4. 发明授权

US10833766B2 Monitoring equipment for an optical transport system 有权
公开(公告)号：US10833766B2
公开(公告)日：2020-11-10
申请号：US16520684
申请日：2019-07-24
申请人： Alcatel Submarine Networks
发明人： Omar Ait Sab , Victor Faraci
IPC分类号： H04J14/02 , H04B10/40 , H04B10/29 , H04B10/077
摘要： A landing station whose monitoring equipment employs a depolarized light source for generating the supervisory optical signals that are used to monitor certain performance characteristics of the corresponding submerged fiber-optic cable plant. In some embodiments, the depolarized light source operates to provide amplified spontaneous emission (ASE) within the bandwidths of the supervisory wavelength channels, with the supervisory optical signals being generated by modulating the provided ASE. In some other embodiments, the depolarized light source operates to generate a supervisory optical signal by modulating two carrier waves having (i) mutually orthogonal polarizations and (ii) different respective carrier wavelengths both of which are within the bandwidth of the corresponding supervisory wavelength channel. The use of such depolarized light sources can advantageously reduce the negative impact of the supervisory wavelength channels on the payload wavelength channels with respect to that observed under at least some conventional monitoring schemes.

5. 发明授权

US11828631B2 Method and apparatus for suppression of noise due to local oscillator instability in a coherent fiber optical sensor 有权
公开(公告)号：US11828631B2
公开(公告)日：2023-11-28
申请号：US16911092
申请日：2020-06-24
申请人： Alcatel Submarine Networks
发明人： Erlend Ronnekleiv , Ole Henrik Waagaard
IPC分类号： G01D5/353 , H04B10/61
CPC分类号： G01D5/35358 , G01D5/35306 , H04B10/61
摘要： A method for measuring a response from an optical fiber providing distributed back reflections using a system comprising an optical source comprising a laser, an optical receiver and a processing unit is disclosed. The method comprises generating an interrogation signal and an optical local oscillator using the optical source, the interrogation signal being represented by an interrogation phasor and the optical local oscillator being represented by a local oscillator phasor; transmitting the interrogation signal into the optical fiber; and mixing the optical local oscillator with reflected light from the optical fiber and detecting a mixing product with the optical receiver to achieve a receiver output signal. The method further comprises performing a measurement that characterizes fluctuations in the local oscillator phasor; processing the receiver output signal based on the measurement result to provide a corrected receiver output signal such that an effect of fluctuations in the local oscillator phasor on the corrected receiver output signal is reduced; and applying distributed back-reflection processing on the corrected receiver output signal. Finally, the method comprises extracting the response from the optical fiber from the distributed back-reflection processing output. A system for measuring a response from an optical fiber providing distributed back reflections is also disclosed.

6. 发明授权

US11499849B2 Method and apparatus for suppression of noise due to transmitted signal instability in a coherent fiber optical sensor system 有权
公开(公告)号：US11499849B2
公开(公告)日：2022-11-15
申请号：US16911085
申请日：2020-06-24
申请人： Alcatel Submarine Networks
发明人： Ole Henrik Waagaard , Erlend Ronnekleiv
IPC分类号： G01D5/353
摘要： A method for measuring a response from an optical fiber providing distributed back reflections using a system comprising an optical source comprising a laser, an optical receiver and a processing unit is disclosed. The method comprises establishing initial parameters of a distributed back-reflection processing. The method also comprises generating an interrogation signal and an optical local oscillator using the optical source, the interrogation signal being represented by an interrogation phasor and the optical local oscillator being represented by a local oscillator phasor; transmitting the interrogation signal into the optical fiber; and mixing the optical local oscillator with reflected light from the optical fiber and detecting a mixing product with the optical receiver to achieve a receiver output signal. The method further comprises performing a measurement that characterizes the interrogation phasor; updating the parameters of the distributed back-reflection processing based on the measurement result such that an effect of fluctuations in the interrogation phasor on the measured response from the fiber is reduced; and applying distributed back-reflection processing to the receiver output signal. Finally, the method comprises extracting the response from the optical fiber from the distributed back-reflection processing output. A system for measuring a response from an optical fiber providing distributed back reflections is also disclosed.

7. 发明申请

US20210325236A1 FIBRE-OPTIC HYDROPHONE WITH INTERNAL FILTER 有权
公开(公告)号：US20210325236A1
公开(公告)日：2021-10-21
申请号：US17226270
申请日：2021-04-09
申请人： Alcatel Submarine Networks
发明人： Arne Berg
IPC分类号： G01H9/00
摘要： A fibre-optic hydrophone comprising a substantially incompressible tubular body, the tubular body generally having a geometry of a cylindrical shell defining an axis, and a deflectable outer wall, arranged to surround the tubular body in a distance thereof, and defining an axis that is arranged to substantially coincide with the axis of the tubular body. The hydrophone further comprising an optical fibre coil arranged on an outer surface of the outer wall, and a first and a second end lid arranged to seal the tubular body and the outer wall at a first end and a second end thereof, respectively, the first end lid and the second end lid being substantially incompressible. Additionally, the hydrophone comprising an outer cavity defined by an inner surface of the outer wall, an outer surface of the tubular body, the first lid, and the second lid; and an inner cavity defined by an inner surface of the tubular body, the first lid, and the second lid. The outer cavity is in fluid communication with the inner cavity via one or more passages in the tubular body, the outer cavity and the inner cavity being filled with a fluid, wherein the passages are configured to contribute to a function as a filter defining a low pass filter response with high cut-off frequency. In some embodiments the deflectable outer wall is cylindrical.

8. 发明申请

US20200266897A1 SYMMETRICAL SUPERVISORY OPTICAL CIRCUIT FOR A BIDIRECTIONAL OPTICAL REPEATER 审中-公开
公开(公告)号：US20200266897A1
公开(公告)日：2020-08-20
申请号：US16793294
申请日：2020-02-18
申请人： Alcatel Submarine Networks
发明人： Stephane Ruggeri
IPC分类号： H04B10/297 , H04J14/02 , H04B10/25
摘要： A bidirectional optical repeater having two unidirectional optical amplifiers and a supervisory optical circuit connected to optically couple the corresponding two optical paths through the repeater. In an example embodiment, the supervisory optical circuit is symmetrical in the sense that it enables the two optical input/output port pairs of the repeater to be interchangeable and functionally equivalent at least with respect to two supervisory wavelengths and some in-band and/or out-of-band wavelengths. This symmetry can advantageously be used, e.g., to improve the installation process directed at installing such optical repeaters in an undersea cable system. For example, a single directional orientation of the optical repeaters does not need to be maintained throughout the cable system, which can significantly reduce the risk and/or cost of installation errors.

9. 发明公开

US20240159574A1 METHOD AND APPARATUS FOR SUPPRESSION OF NOISE DUE TO LOCAL OSCILLATOR INSTABILITY IN A COHERENT FIBER OPTICAL SENSOR 审中-公开
公开(公告)号：US20240159574A1
公开(公告)日：2024-05-16
申请号：US18519491
申请日：2023-11-27
申请人： Alcatel Submarine Networks
发明人： Erlend Ronnekleiv , Ole Henrik Waagaard
IPC分类号： G01D5/353 , H04B10/61
CPC分类号： G01D5/35358 , G01D5/35306 , H04B10/61
摘要： A method for measuring a response from an optical fiber providing distributed back reflections using a system comprising an optical source comprising a laser, an optical receiver and a processing unit is disclosed. The method comprises generating an interrogation signal and an optical local oscillator using the optical source, the interrogation signal being represented by an interrogation phasor and the optical local oscillator being represented by a local oscillator phasor; transmitting the interrogation signal into the optical fiber; and mixing the optical local oscillator with reflected light from the optical fiber and detecting a mixing product with the optical receiver to achieve a receiver output signal. The method further comprises performing a measurement that characterizes fluctuations in the local oscillator phasor; processing the receiver output signal based on the measurement result to provide a corrected receiver output signal such that an effect of fluctuations in the local oscillator phasor on the corrected receiver output signal is reduced; and applying distributed back-reflection processing on the corrected receiver output signal. Finally, the method comprises extracting the response from the optical fiber from the distributed back-reflection processing output. A system for measuring a response from an optical fiber providing distributed back reflections is also disclosed.

10. 发明授权

US10778336B2 Communication system employing self-tuning optical transceivers 有权
公开(公告)号：US10778336B2
公开(公告)日：2020-09-15
申请号：US16427514
申请日：2019-05-31
申请人： Alcatel Submarine Networks
发明人： Christophe Mougin , Eric Ternier
IPC分类号： H04B10/079 , H04B10/564 , H04B10/40 , H04B10/50 , H04J14/02
摘要： An optical transceiver capable of optimizing the performance of the corresponding optical channel by dynamically adjusting the optical power of the output signal in response to the FEC-performance data received from the corresponding remote transceiver. In an example embodiment, the FEC-performance data can be exchanged by the two optical transceivers using a dedicated field in the overhead of the transmitted data frames. The power-adjustment process is configured to be relatively slow to prevent the occurrence of transients on other optical channels and ensure stable operation of the corresponding WDM system as a whole, while different transceivers thereof are allowed to adjust their respective output powers in an autonomous way and independent of each other. The performance optimization can be directed at meeting a predefined performance target specified by the system designer or operator while driving the operating point away from conditions under which nonlinear optical effects may become relatively prominent.

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