WO2024078013A1 - Procédé de détection de défaillance de liaison par fibre optique, système de communication et appareil - Google Patents

Procédé de détection de défaillance de liaison par fibre optique, système de communication et appareil Download PDF

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Publication number
WO2024078013A1
WO2024078013A1 PCT/CN2023/102717 CN2023102717W WO2024078013A1 WO 2024078013 A1 WO2024078013 A1 WO 2024078013A1 CN 2023102717 W CN2023102717 W CN 2023102717W WO 2024078013 A1 WO2024078013 A1 WO 2024078013A1
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node
optical signal
fourier transform
fractional fourier
identification sequence
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PCT/CN2023/102717
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English (en)
Chinese (zh)
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李博睿
李良川
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华为技术有限公司
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Publication of WO2024078013A1 publication Critical patent/WO2024078013A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
    • H04B10/07—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems
    • H04B10/071—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems using a reflected signal, e.g. using optical time domain reflectometers [OTDR]

Definitions

  • the present application relates to the field of optical communication technology, and in particular to an optical fiber link fault detection method, communication system and device.
  • Fiber link fault detection is very important for the maintenance of optical communication systems, including abnormal reflection points and abnormal loss increase in the link, and the location of these abnormal changes needs to be diagnosed.
  • the principle that the optical signal decreases with the increase of transmission distance is used to detect the intensity of the reflected optical signal, and then determine the type and location of the fault, that is, the working principle of the optical time domain reflectometer (OTDR).
  • the OTDR system consists of two parts. The transmitting part transmits periodic optical pulses into the optical link, and the receiving part detects the intensity of the reflected optical pulses. Through average processing, the intensity of the optical pulse signal that decreases linearly with the increase of the transmission distance is obtained.
  • the OTDR device is usually independent of the communication transceiver.
  • a handheld OTDR instrument which is used to detect after the optical fiber link has failed, such as after the fiber is broken, and lacks real-time performance.
  • Another form is a separate OTDR board or module, which is independent of the communication device and requires additional cost.
  • a coherent OTDR device is usually used, which is extremely costly.
  • the present application provides a method, a communication system and a device for detecting optical fiber link faults, which are used to solve the problems in the prior art of requiring an additional OTDR device to realize optical fiber link fault detection, which is costly and untimely.
  • the present application provides a method for detecting a fault in an optical fiber link, which is applied to a first node, and may also be a module applied to the first node, such as a chip or a chip system.
  • the following description is made by taking the execution subject as the first node as an example.
  • the method for detecting a fault in an optical fiber link may include: a first node sends a first service optical signal to a second node, wherein the first service optical signal includes a first identification sequence, and the first identification sequence is obtained by a first constant sequence after a p-order fractional Fourier transform.
  • the first node obtains a received optical signal, which may include a reflected optical signal generated by the back Rayleigh scattering of the first service optical signal in optical fiber transmission.
  • the first node performs a (1-p)-order fractional Fourier transform on the received optical signal to obtain a fractional Fourier transform spectrum.
  • the peak value of the fractional Fourier transform spectrum corresponds to the energy of the first identification sequence in the reflected optical signal of the first service optical signal.
  • the first node performs peak detection on the fractional Fourier transform spectrum, and a curve of the signal strength of the first identification sequence changing with the transmission distance can be obtained.
  • the signal strength change curve can be used to detect faults in the optical fiber link between the first node and the second node.
  • the first node can detect the fault of the link between the first node and the second node based on the reflected signal of the first service optical signal during the service transmission process.
  • This solution can be continuously executed during the service transmission process, so as to realize real-time fault monitoring of the link, and can share a set of transceiver devices with the service signal, without the need for an additional OTDR device.
  • the first constant sequence is transformed by a p-order fractional Fourier transform to obtain a first identification sequence, which can be implemented by the following formula: Where x(t) is the first constant sequence, Xp (u) is the first identification sequence, and p is the order of the fractional Fourier transform.
  • the first identification sequence may be generated by the first node performing a p-order fractional Fourier transform on the first constant sequence.
  • the first identification sequence may be preconfigured in the first node.
  • the first node may insert the first identification sequence into a specified position in the first service optical signal, where the specified position may be the head, tail or other position of the first service optical signal.
  • the first node performs a (1-p)-order fractional Fourier transform on the received optical signal, which can be implemented by the following formula:
  • y(t) is the received optical signal
  • Y (1-p) (u) is the fractional Fourier transform spectrum
  • (1-p) is the order of the fractional Fourier transform
  • the received optical signal acquired by the first node may also include a second service optical signal from the second node.
  • the second service optical signal may include a second identification sequence, which is obtained by subjecting the second constant sequence to a q-order fractional Fourier transform, and p is not equal to q.
  • the second node side may also perform similar actions as the first node side to jointly implement link fault detection.
  • the first node is connected to multiple nodes via an optical splitter
  • the aforementioned second node may be any one of the multiple nodes
  • the multiple nodes may send service optical signals to the first node via the optical splitter in a time division multiplexing manner.
  • the multiple nodes connected to the first node through the optical splitter also include a third node
  • the received optical signal obtained by the first node may also include: a third service optical signal from the third node.
  • the third service optical signal includes a third identification sequence, and the third identification sequence may be obtained by performing an r-order fractional Fourier transform of a third constant sequence, where r is not equal to p, and r is not equal to q.
  • the first node may be an optical line terminal (OLT), and the second node and the third node may be optical network units (ONUs).
  • the optical link fault detection method provided in this embodiment may also include: the first node sends a first ONU management and control interface (OMCI) message or a first physical layer operations, administration and maintenance (PLOAM) message to the second node, and the first OMCI message or the first PLOAM message is used to indicate the order q. And, the first node sends a second OMCI message or a second PLOAM message to the third node, and the second OMCI message or the second PLOAM message is used to indicate the order r.
  • OMCI ONU management and control interface
  • PLOAM physical layer operations, administration and maintenance
  • a communication system which may include the first node and the second node in the first aspect.
  • the first node can be used to send a first business optical signal to the second node, and the first business optical signal can include a first identification sequence, and the first identification sequence is obtained by a first constant sequence through a p-order fractional Fourier transform.
  • the first node can also be used to obtain a received optical signal, and the received optical signal obtained by the first node includes a reflected optical signal generated by the back Rayleigh scattering of the first business optical signal during the optical fiber transmission process.
  • the first node can also be used to perform a (1-p)-order fractional Fourier transform on the received optical signal obtained by the first node to obtain a fractional Fourier transform spectrum.
  • the peak value of the fractional Fourier transform spectrum corresponds to the energy of the first identification sequence in the reflected optical signal of the first business optical signal.
  • the first node can also be used to perform peak detection on the fractional Fourier transform spectrum to obtain a signal strength change curve of the first identification sequence.
  • the signal strength change curve can be used to detect faults in the optical fiber link between the first node and the second node.
  • the second node may also be used to send a second service optical signal to the first node, and the received optical signal acquired by the first node also includes the second service optical signal from the second node.
  • the second service optical signal includes a second identification sequence
  • the second identification sequence is obtained by performing a q-order fractional Fourier transform on the second constant sequence, where q is not equal to p.
  • the second node can also be used to obtain a received optical signal, and the received optical signal obtained by the second node includes a reflected optical signal generated by the back Rayleigh scattering of the second service optical signal during the optical fiber transmission process.
  • the second node can also be used to perform a (1-q)-order fractional Fourier transform on the received optical signal obtained by the second node to obtain a fractional Fourier transform spectrum.
  • the peak of the fractional Fourier transform spectrum corresponds to the energy of the second identification sequence in the reflected optical signal of the second service optical signal.
  • the second node can also be used to perform peak detection on the fractional Fourier transform spectrum to obtain a signal strength change curve of the second identification sequence; wherein the signal strength change curve is used to perform fault detection on the optical fiber link between the second node and the first node.
  • the second node side may also perform similar actions as the first node side to jointly implement link failure detection.
  • the first node is connected to a plurality of nodes via an optical splitter, and the plurality of nodes may include the second node.
  • the service optical signals sent by the plurality of nodes are transmitted to the first node in a time division multiplexing manner.
  • the system may further include a third node.
  • the third node is any one of a plurality of nodes connected to the first node through an optical splitter.
  • the third node may be used to send a third service optical signal to the first node, the third service optical signal including a third identification sequence.
  • the third identification sequence is obtained by performing an r-order fractional Fourier transform of the third constant sequence, where r is not equal to p, and r is not equal to q.
  • the third node can also be used to obtain a received optical signal, and the received optical signal obtained by the third node includes the first business optical signal and the reflected optical signal generated by the back Rayleigh scattering of the third business optical signal during the optical fiber transmission process.
  • the third node can also be used to perform a (1-r) order fractional Fourier transform on the received optical signal obtained by the third node to obtain a fractional Fourier transform spectrum.
  • the peak of the fractional Fourier transform spectrum corresponds to the energy of the third identification sequence in the reflected optical signal of the third business optical signal.
  • the third node can also be used to perform peak detection on the fractional Fourier transform spectrum to obtain a signal intensity change curve of the third identification sequence.
  • the signal intensity change curve is used to perform fault detection on the optical fiber link between the third node and the optical splitter or the first node.
  • the third node side can also perform similar actions as the first node side to jointly implement link fault detection.
  • different nodes use different orders of fractional Fourier transform.
  • the present application provides a communication device, which may be a first node or a chip or chip system in the first node, or may be a function in the first node for implementing the method described in any possible design of the first aspect.
  • the communication device can implement the functions performed by the first node in the above aspects or possible designs, and the functions can be implemented by hardware executing corresponding software.
  • the hardware or software includes one or more modules corresponding to the above functions.
  • the communication device includes: a sending unit, a receiving unit and a processing unit.
  • the sending unit is used to send a first business optical signal to the second node, wherein the first business optical signal includes a first identification sequence, and the first identification sequence is obtained by a first constant sequence after a p-order fractional Fourier transform.
  • the receiving unit is used to obtain a received optical signal, and the received optical signal includes a reflected optical signal generated by the back Rayleigh scattering of the first business optical signal during the optical fiber transmission process.
  • the processing unit is used to perform a (1-p)-order fractional Fourier transform on the received optical signal to obtain a fractional Fourier transform spectrum.
  • the peak value of the fractional Fourier transform spectrum corresponds to the energy of the first identification sequence in the reflected optical signal of the first business optical signal.
  • the processing unit is also used to perform peak detection on the fractional Fourier transform spectrum to obtain a signal strength change curve of the first identification sequence.
  • the signal strength change curve can be used to detect faults in the optical fiber link between the first node and the second node.
  • the first constant sequence is transformed by a p-order fractional Fourier transform to obtain a first identification sequence, which can be implemented by the following formula: Where x(t) is the first constant sequence, Xp (u) is the first identification sequence, and p is the order of the fractional Fourier transform.
  • the first identification sequence may be generated by the first node performing a p-order fractional Fourier transform on the first constant sequence.
  • the first identification sequence may be preconfigured in the first node.
  • the first node may insert the first identification sequence into a specified position in the first service optical signal, where the specified position may be the head, tail or other position of the first service optical signal.
  • the first node performs a (1-p)-order fractional Fourier transform on the received optical signal, which can be implemented by the following formula: Wherein, y(t) is the received optical signal, Y (1-p) (u) is the fractional Fourier transform spectrum, (1-p) is the order of the fractional Fourier transform,
  • the received optical signal acquired by the first node may also include a second service optical signal from the second node.
  • the second service optical signal may include a second identification sequence, where the second identification sequence is obtained by subjecting the second constant sequence to a q-order fractional Fourier transform, and p is not equal to q.
  • the first node is connected to multiple nodes via an optical splitter, and the aforementioned second node may be any one of the multiple nodes.
  • the multiple nodes may send service optical signals to the first node via the optical splitter in a time division multiplexing manner.
  • the multiple nodes connected to the first node through the optical splitter also include a third node
  • the received optical signal obtained by the first node may also include: a third service optical signal from the third node.
  • the third service optical signal may include a third identification sequence, and the third identification sequence may be obtained by performing an r-order fractional Fourier transform of a third constant sequence, where r is not equal to p, and r is not equal to q.
  • the first node may be an optical line terminal OLT
  • the second node and the third node may be optical network units ONU.
  • the sending unit may also be used to send a first OMCI message or a first PLOAM message to the second node, the first OMCI message or the first PLOAM message being used to indicate the order q.
  • the sending unit may also be used to send a second OMCI message or a second PLOAM message to the third node, the second OMCI message or the second PLOAM message being used to indicate the order r.
  • a communication device comprising: a communication interface and a processor; wherein the communication interface can be used to execute the sending and receiving behaviors in the optical fiber link fault detection method described in any one of the first aspects above, and the processor is used to execute the processing behaviors in the optical fiber link fault detection method described in any one of the first aspects above.
  • a communication device comprising: a processor; the processor is used to couple with a memory, and after reading instructions in the memory, execute the optical fiber link fault detection method as described in any one of the first aspects above according to the instructions.
  • the communication device further includes a memory; the memory is used to store computer instructions.
  • the communication device further includes a communication interface; the communication interface is used for the communication device to communicate with other devices.
  • the communication interface is a transceiver, an input/output interface, an interface circuit, an output circuit, an input circuit, a pin or a related circuit.
  • the communication device may be a chip or a chip system.
  • the communication device may be composed of a chip, or may include a chip and other discrete devices.
  • the communication interface may be an input/output interface, an interface circuit, an output circuit, an input circuit, a pin or a related circuit on the chip or the chip system, etc.
  • the processor may also be embodied as a processing circuit or a logic circuit.
  • a computer-readable storage medium wherein instructions are stored in the computer-readable storage medium, and when the computer-readable storage medium is run on a computer, the computer executes the optical fiber link fault detection method described in any one of the first aspects above.
  • the technical effects brought about by any design method in the fourth to sixth aspects can refer to the technical effects brought about by different design methods in the first aspect, and will not be repeated here.
  • FIG1 is a schematic diagram of a point-to-point optical communication system provided in an embodiment of the present application.
  • FIG2 is a schematic diagram of an optical communication system with a point-to-multipoint structure provided in an embodiment of the present application
  • FIG3 is a schematic diagram of the structure of a communication device provided in an embodiment of the present application.
  • FIG4 is a schematic diagram of the structure of another communication device provided in an embodiment of the present application.
  • FIG5 is a flow chart of a method for detecting optical fiber link failure provided in an embodiment of the present application.
  • FIG6 is a schematic diagram of the structure of another communication device provided in an embodiment of the present application.
  • FIG. 7 is a schematic diagram of the structure of another communication device provided in an embodiment of the present application.
  • Rayleigh scattering Scattering is the phenomenon that when a light beam passes through a medium with uneven optical properties, the light propagates in all directions. Scattering can include many types, including Rayleigh scattering.
  • the scattered wavelength of Rayleigh scattering is the same as the incident wavelength, and the scattered light intensity is inversely proportional to the fourth power of the wavelength.
  • the scattered light intensity is distributed in a dumbbell-shaped angle according to the spatial direction.
  • the Rayleigh scattering effect also occurs when the signal light is transmitted in the optical fiber.
  • the scattering occurs in all directions in space, and naturally there is scattering forward or backward along the axial direction of the optical fiber.
  • the Rayleigh scattering of the optical fiber backward along the axial direction is called Rayleigh backscattering.
  • the backscattered light will return to the light source along the optical fiber, so the backscattered light can also be called reflected light.
  • the OTDR uses the Rayleigh scattering effect.
  • the light pulses emitted by the transmitting part of the OTDR will be Rayleigh scattered in the optical link, and the backscattered light pulses (also called reflected light pulses) will return to the OTDR along the optical fiber and be received by the receiving part of the OTDR.
  • the receiving part of the OTDR can detect the intensity of the reflected light pulses and use the principle that the optical signal decreases with the increase of the transmission distance to determine the type and location of the optical fiber fault.
  • continuous light is usually used for business transmission using optical signals, while OTDR emits optical pulses.
  • the signal strength of continuous light is low, and the signal strength of the generated reflected light is naturally low.
  • the reflected light generated by continuous light cannot be used to determine the fault of the optical fiber link.
  • the signal strength of the optical pulse is very large, and the signal strength of the optical pulse reflected in the optical fiber is naturally also very large.
  • the attenuation of the signal strength of the optical pulse with the increase of the transmission distance can be perceived, so it can be used to detect the fault of the optical fiber link. Therefore, OTDR is implemented using optical pulses.
  • At least one of the following or its similar expressions refers to any combination of these items, including any combination of single items or plural items.
  • at least one of a, b, or c can represent: a, b, c, a-b, a-c, b-c, or a-b-c, where a, b, c can be single or multiple.
  • the words "first”, “second” and the like are used to distinguish the same items or similar items with substantially the same functions and effects.
  • the optical fiber link fault detection method provided in the present application can be applied to an optical communication system (also referred to as an optical communication network), which can be a single node to a single node communication, such as a coherent optical communication system in a backbone network, or a single node to multiple nodes communication, such as a passive optical network system (PON) of an access network, a passive optical LAN (POL), etc.
  • the PON can be an asynchronous transfer mode (ATM)-based PON (ATM-PON, APON), a broadband passive optical network (BPON), an Ethernet PON (EPON), or a gigabit PON (GPON), etc.
  • ATM-PON asynchronous transfer mode
  • BPON broadband passive optical network
  • EPON Ethernet PON
  • GPON gigabit PON
  • FIG1 shows a schematic diagram of a point-to-point optical communication system provided in an embodiment of the present application.
  • the optical communication system may include a node 1 and a node 2.
  • Node 1 and node 2 may be directly connected via an optical fiber to achieve optical communication.
  • FIG2 shows a schematic diagram of a point-to-multipoint optical communication system provided by an embodiment of the present application.
  • the optical communication system may include a node A and nodes B1 to Bn.
  • Node A may be connected to nodes B1 to Bn via an optical splitter, and node A may perform optical communication with any node among nodes B1 to Bn.
  • the communication system may be a PON, in which case the node A may be an OLT, and the nodes B1 to Bn may be ONUs.
  • optical communication between nodes in the optical communication system can be achieved based on intensity modulation direct detection or based on coherent detection.
  • FIG. 3 is a schematic diagram of the structure of a communication device provided by the present application, and the communication device may include a media access control (MAC) module 311, a signal processing module 312, a driver 313, a photodetector 314, a laser 315 and a connection unit 316.
  • the connection unit 316 may be a coupler, a circulator, a filter or a wavelength division multiplexer, etc.
  • the MAC module 311 can be used to generate business data
  • the signal processing module 312 can be used to perform signal processing on the business data
  • the laser 315 modulates the business data processed by 312 into an optical signal under the control of the driver 313.
  • the laser 315 can send the optical signal carrying the business data to the optical fiber through the connection unit 316, and then send it to other nodes through the optical fiber.
  • the MAC module 311 can be used to generate a business message to be sent
  • the signal processing module 312 can be used to insert a first identification sequence into the business message to be sent
  • the laser 315 modulates the business message including the first identification sequence into a first business optical signal under the control of the driver 313.
  • the photodetector 314 receives an optical signal from the connection unit 316, and the photodetector 314 can convert the received optical signal into an electrical signal.
  • the signal processing module 312 can process the electrical signal.
  • the MAC module 311 can parse the electrical signal passing through the signal processing module 312 to obtain business data. For example, taking the first node including the communication device shown in Figure 3 as an example, the photodetector 314 can convert the acquired received optical signal into an electrical signal, the signal processing module 312 can perform a (1-p) order fractional Fourier transform on the electrical signal after the received optical signal is converted, and the MAC module 311 can parse the obtained fractional Fourier transform sequence.
  • the photodetector 314 can convert the acquired received optical signal into an electrical signal
  • the signal processing module 312 can perform a (1-p) order fractional Fourier transform on the electrical signal after the received optical signal is converted
  • the MAC module 311 can parse the obtained fractional Fourier transform sequence.
  • FIG. 4 is a schematic diagram of the structure of a communication device provided in an embodiment of the present application, and the communication device may include: a laser 411a, a laser 411b, a splitter 412a, a coupler 412b, a coherent transmitter 413, a coherent receiver 414, a MAC module 415, and a connection unit 416.
  • the connection unit 416 may be a coupler, a circulator, a filter, etc.
  • the laser emitted by the laser 411a is input to the coherent transmitter 413 through the optical splitter 412a, the MAC module 415 can be used to generate a service signal, and the coherent transmitter 413 can be used to modulate the service signal into the laser, and then output the optical signal.
  • the transmitted optical signal enters the optical fiber through the connection unit 416 and is then sent to other nodes.
  • the coherent receiver 414 receives the optical signal through the connection unit 416.
  • the received optical signal may include the optical signal sent by other nodes and the reflected signal of the signal sent by this node.
  • the laser emitted by the laser 411a can be input to the coherent receiver 414 through the coupler 412b, and can be used to beat the reflected signal of the optical signal sent by this node.
  • the laser emitted by the laser 411b is used as a local oscillator laser for beating the optical signal sent by other nodes, and performs coherent reception processing on the optical signal sent by other nodes.
  • the coherent receiver 414 receives the optical signal and processes it, and the processed electrical signal is input to the MAC module 415, and the MAC module 415 can parse the coherently received signal to obtain business data.
  • Figures 1 and 2 are only possible implementations of the optical communication network provided by the present application
  • Figures 3 and 4 are only possible implementations of the communication device provided by the present application, and should not be understood as limiting the present application.
  • the optical communication network may include more or fewer nodes, and there may be other connection relationships between the nodes; for example, the communication device
  • the hardware structure can be increased or decreased, or replaced with other hardware components.
  • the optical fiber link fault detection method based on the reflected light of the service optical signal provided in the embodiment of the present application can be applied to point-to-point optical communication scenarios (such as the optical communication system shown in Figure 1), and can also be applied to point-to-multipoint optical communication scenarios (such as the optical communication system shown in Figure 2).
  • FIG. 5 shows a flow chart of an optical fiber link fault detection method, which may include steps 501 to 504.
  • Step 501 A first node sends a first service optical signal to a second node.
  • the first service optical signal includes a first identification sequence.
  • the first identification sequence is obtained by performing a p-order fractional Fourier transform on a first constant sequence.
  • the service optical signal is an optical signal modulated according to the service message/data (electrical signal), and this application explains it uniformly here.
  • the complete electrical signal corresponding to the first service optical signal may include a first electrical signal corresponding to the first service message and a second electrical signal corresponding to the first identification sequence.
  • the first node modulates the complete electrical signal including the first electrical signal and the second electrical signal to obtain the first service optical signal.
  • the first node may insert the first identification sequence (electrical signal) into a specified position in the first service message (electrical signal), which may be the head, tail or other position of the first service message.
  • the first identification sequence may be pre-configured in the first node, or may be obtained by the first node performing a p-order fractional Fourier transform on the first constant sequence, which is not limited in the present application.
  • the first constant sequence is transformed by a p-order fractional Fourier transform to obtain a first identification sequence, which can be implemented by the following formula (1).
  • x(t) is the first constant sequence
  • Xp (u) is the first identification sequence
  • p is the order of fractional Fourier transform (also called order)
  • t is time
  • u is the variable in the transform domain after fractional transform
  • j is an imaginary number in complex number operation
  • e is a natural number
  • ⁇ is the angle of the fractional Fourier transform (FrFT) sequence (i.e., the first identification sequence) in the Wigner domain
  • p is any value between -1 and 1.
  • the first constant sequence may be a DC component, such as [111...111].
  • Step 502 The first node obtains a received optical signal, where the received optical signal includes a reflected optical signal generated by backscattering of a first service optical signal during optical fiber transmission.
  • the received optical signal obtained by the first node includes the reflected light signal of the first service optical signal.
  • the optical fiber link fault detection method may be applied in a process of service transmission between a first node and a second node.
  • the received optical signal acquired by the first node may also include a second service optical signal from the second node.
  • Step 503 The first node performs a (1-p)-order fractional Fourier transform on the received optical signal to obtain a fractional Fourier transform spectrum, wherein the peak of the fractional Fourier transform spectrum corresponds to the energy of the first identification sequence in the reflected optical signal of the first service optical signal.
  • the received optical signal obtained by the first node includes the reflected signal of the first service optical signal.
  • a node performs a (1-p) order fractional Fourier transform on a received optical signal, it also performs a (1-p) order fractional Fourier transform on a reflected optical signal of a first service optical signal. Since the reflected optical signal of the first service optical signal includes a first identification sequence, the first node also performs a (1-p) order fractional Fourier transform on the first identification sequence.
  • FrFT sequences of different orders will form different angles of rotation in the Wigner domain and show energy concentration at their respective angles. This process is conducive to extracting energy features from weak signals and can be reflected in the signal processing of the optical receiving device of the optical signal.
  • the optical receiving device (such as the first node mentioned above) can perform a (1-p)-order FrFT transformation on the received optical signal including the p-order FrFT sequence.
  • the FrFT sequence obtained after processing will contain a maximum value, which indicates the energy concentration phenomenon presented by the p-order FrFT sequence.
  • the first node can obtain the energy of the first identification sequence in the received optical signal after performing a (1-p) order fractional Fourier transform on the received optical signal.
  • the first node can determine the energy of the optical signal reflected by the first identification sequence during the transmission of the first service message through the processing of the (1-p) order fractional Fourier transform.
  • the first node performs a (1-p)-order fractional Fourier transform on the received optical signal, which is implemented by the following formula (2):
  • y(t) is the received optical signal
  • Y (1-p) (u) is the fractional Fourier transform spectrum
  • (1-p) is the order of the fractional Fourier transform
  • t is time
  • u is the variable in the transform domain after the fractional transform
  • j is an imaginary number in complex number operations
  • e is a natural number
  • ⁇ is the angle of the fractional Fourier transform sequence (i.e., the first identification sequence) in the Wigner domain
  • Step 504 The first node performs peak detection on the obtained fractional Fourier transform spectrum to obtain a signal strength variation curve of the first identification sequence, wherein the signal strength variation curve is used to perform fault detection on the optical fiber link between the first node and the second node.
  • the first node can determine the energy of the first identification sequence by performing peak detection on the fractional Fourier transform spectrum.
  • the first node detects faults in the optical fiber link by energy changes of the first identification sequence.
  • OTDR uses reflected signals to detect optical fiber link faults
  • possible examples of fault detection provided by this embodiment are described respectively.
  • the first node can determine that the optical fiber link is in a normal state.
  • the signal strength change curve of the first identification sequence has abnormal fluctuations (such as a sudden decrease in the curve)
  • the first node can determine that the optical fiber link has a fault.
  • the energy change curve (such as the signal strength change curve in step 504) determined by the first node for continuous processing of the received optical signal reflects the real-time change trend of the energy.
  • the analysis of the signal strength change curve by the first node can realize real-time fault detection of the optical fiber link, thereby improving the timeliness of fault detection.
  • the first node can carry the first identification sequence obtained by the p-order fractional Fourier transform in the transmitted first service optical signal.
  • the first node can also perform a (1-p)-order fractional Fourier transform on the received optical signal to obtain a fractional Fourier transform spectrum, wherein the received optical signal includes the reflected optical signal of the first service optical signal, and the peak value of the fractional Fourier transform spectrum indicates the energy of the first identification sequence.
  • the first node can detect the energy of the first identification sequence according to the fractional Fourier transform spectrum, so the energy change of the first identification sequence can be used to realize fault detection of the optical fiber link.
  • the first node can continuously receive and process the received optical signal, thereby obtaining a continuous signal strength variation curve of the first identification sequence.
  • the signal strength variation curve reflects the first service optical signal during the optical fiber transmission.
  • the energy value of the optical signal reflected by the identification sequence changes.
  • the signal strength change curve can reflect the real-time transmission of the signal, so that the signal strength change curve can be used to detect the optical fiber link between the first node and the second node in real time, thereby improving the timeliness of fault detection.
  • the optical fiber link fault detection method provided in the embodiment of the present application can be implemented based on the usual business transmission process, is compatible with the existing optical communication system, does not need to modify the structure of the optical communication system, is easy to deploy and implement, and has low cost.
  • the node can implement the link detection function by sharing a set of transceiver devices with the transmission of business signals, does not require an additional OTDR device, and reduces the hardware cost required for fault detection of optical fiber links between nodes.
  • the second node may further send a second service optical signal to the first node, and the second service optical signal may include a second identification sequence, and the second identification sequence may be obtained by subjecting the second constant sequence to a q-order fractional Fourier transform, where q is not equal to p.
  • the second identification sequence may refer to the relevant description of the first identification sequence in step 501 above, and the formula for generating the second identification sequence may refer to formula (1), and it is only necessary to replace the fractional Fourier transform order in formula (1) with q.
  • FrFT sequences of different orders are orthogonal to each other in the fractional domain.
  • the first node performs a (1-p)-order fractional Fourier transform on the received optical signal, so the q-order second identification sequence will not interfere with the first node obtaining the energy of the p-order first identification sequence.
  • the method of the present application may further include the following steps A(1) to A(3):
  • the second node obtains a received optical signal.
  • the received optical signal obtained by the second node may include a reflected optical signal generated by backscattering of the second service optical signal during optical fiber transmission.
  • the received optical signal acquired by the second node may further include the first service optical signal.
  • step A(1) reference may be made to the relevant description of step 502 above.
  • Step A(2) The second node performs a (1-q)-order fractional Fourier transform on the received optical signal to obtain a fractional Fourier transform spectrum, wherein the peak of the fractional Fourier transform spectrum corresponds to the energy of the second identification sequence in the reflected optical signal of the second service optical signal.
  • This step A(2) may refer to the relevant description of the above step 503.
  • the formula for the second node to perform a (1-q)-order fractional Fourier transform on the received optical signal it obtains may refer to the above formula (2), and it is only necessary to replace the fractional Fourier transform order in formula (2) with 1-q.
  • step A(3) the second node is also used to perform peak detection on the fractional Fourier transform spectrum to obtain a signal strength variation curve of the second identification sequence; wherein the signal strength variation curve is used to perform fault detection on the optical fiber link between the second node and the first node.
  • step A(3) reference may be made to the relevant description of step 504 above.
  • the second node when the second service message includes the second identification sequence, can also detect the fault of the optical fiber link by processing the received optical signal.
  • the first node and the second node are both detecting the link status between the first node and the second node during the service signal transmission process.
  • the optical fiber link fault detection method of the present application can be applied to a point-to-point optical communication system, and the first node and the second node can be directly connected via an optical fiber.
  • the first node can be node 1
  • the second node can be node 2.
  • the first node can be node 2
  • the second node can be node 1.
  • the optical fiber link fault detection method of the service signal reflected light of the present application can be applied to a point-to-multipoint structure.
  • the first node may be connected to multiple nodes via an optical splitter, and the second node may be one of the multiple nodes.
  • the first node may be node A, and the second node may be any one of nodes B1 to Bn.
  • the service optical signals sent by the multiple nodes may be transmitted to the first node in a time division multiplexing manner.
  • the multiple nodes connected to the first node through the optical splitter may further include a third node.
  • the third node may be any one of the nodes B1 to Bn, and the third node may be different from the second node.
  • the third service optical signal sent by the third node to the first node may include a third identification sequence.
  • the third identification sequence is obtained by subjecting the third constant sequence to an r-order fractional Fourier transform, where r is not equal to p and r is not equal to q. It should be understood that the third identification sequence can refer to the relevant description of the first identification sequence in step 501 above, and the formula for generating the third identification sequence can refer to formula (1), and it is only necessary to replace the fractional Fourier transform order in formula (1) with r.
  • the method of the present application may further include the following steps B(1) to B(3):
  • Step B(1) The third node obtains a received optical signal.
  • the received optical signal obtained by the third node may include a reflected optical signal generated by backscattering of the third service optical signal during optical fiber transmission.
  • the received optical signal acquired by the third node may further include the first service optical signal.
  • step B(1) reference may be made to the relevant description of step 502 above.
  • Step B(2) The third node performs a (1-q)th order fractional Fourier transform on the received optical signal to obtain a fractional Fourier transform spectrum, wherein the peak of the fractional Fourier transform spectrum corresponds to the energy of the third identification sequence in the reflected optical signal of the third service optical signal.
  • This step B(2) may refer to the relevant description of the above step 503.
  • the formula for the third node to perform a (1-q)-order fractional Fourier transform on the received optical signal it obtains may refer to the above formula (2), and it is only necessary to replace the fractional Fourier transform order in formula (2) with 1-q.
  • step B(3) the third node is also used to perform peak detection on the fractional Fourier transform spectrum to obtain a signal strength variation curve of the third identification sequence; wherein the signal strength variation curve is used to perform fault detection on the optical fiber link between the third node and the first node.
  • step B(3) reference may be made to the relevant description of step 504 above.
  • the service optical signals sent by the first node, the second node and the third node can all carry identification sequences.
  • the difference is that the identification sequences carried by different nodes use different fractional Fourier transform orders.
  • the first node when the first node is connected to the second node and the third node through a splitter, the first node can monitor the link status between the first node and the splitter according to the signal strength change curve of the first identification sequence, the second node can monitor the link status between the second node and the splitter according to the signal strength change curve of the second identification sequence, and the third node can monitor the link status between the third node and the splitter according to the signal strength change curve of the third identification sequence.
  • each node can monitor the link status between the node and the optical splitter based on the method provided by the present application, so that the link monitoring of the entire network is completed by each node in the network.
  • this solution distributes the monitoring tasks to each node, which can reduce the workload of a single node.
  • the distributed deployment method also makes it easy to determine the link where the fault is located.
  • the fractional Fourier transform orders used by multiple nodes at the user end may be issued by the master node at the central office.
  • the first node is connected to the second node and the third node via an optical splitter, and the fractional Fourier transform orders of the second node and the third node may be indicated by the first node.
  • the first node when the method of the present application is applied to a point-to-multipoint optical communication system, the first node may be an OLT, and the second node and the third node may be ONUs.
  • the first node may send a first OMCI message or a first PLOAM message to the second node, and the first OMCI message or the first PLOAM message is used to indicate the order q.
  • the first node may also send a second OMCI message or a second PLOAM message to the third node, and the second OMCI message or the second PLOAM message is used to indicate the order r.
  • the method and/or step implemented by the first node can also be implemented by a component (such as a chip or circuit) that can be used for the first node
  • the method and/or step implemented by the second node can also be implemented by a component (such as a chip or circuit) that can be used for the second node
  • the method and/or step implemented by the third node can also be implemented by a component (such as a chip or circuit) that can be used for the third node.
  • the embodiment of the present application further provides a communication device, which is used to implement the above-mentioned various methods.
  • the communication device can also be the first node in the above-mentioned method embodiment, or a device including the above-mentioned first node, or a component that can be used for the first node.
  • the communication device can also be the second node in the above-mentioned method embodiment, or a device including the above-mentioned second node, or a component that can be used for the second node.
  • the communication device can also be the third node in the above-mentioned method embodiment, or a device including the above-mentioned third node, or a component that can be used for the third node.
  • the communication device includes a hardware structure and/or software module corresponding to each function.
  • the present application can be implemented in the form of hardware or a combination of hardware and computer software. Whether a function is executed in the form of hardware or computer software driving hardware depends on the specific application and design constraints of the technical solution. Professional and technical personnel can use different methods to implement the described functions for each specific application, but such implementation should not be considered to exceed the scope of the present application.
  • the embodiment of the present application can divide the functional modules of the communication device according to the above method embodiment.
  • each functional module can be divided according to each function, or two or more functions can be integrated into one processing module.
  • the above integrated module can be implemented in the form of hardware or in the form of software functional modules. It should be noted that the division of modules in the embodiment of the present application is schematic and is only a logical function division. There may be other division methods in actual implementation.
  • FIG6 shows a schematic diagram of the structure of a communication device provided in the present application.
  • the communication device 60 may include a sending unit 601 , a receiving unit 602 , and a processing unit 603 .
  • the communication device 60 is taken as the first node in the above method embodiment as an example:
  • the sending unit 601 can be used to send a first service optical signal to a second node, wherein the first service optical signal includes a first identification sequence, and the first identification sequence is obtained by subjecting a first constant sequence to a p-order fractional Fourier transform.
  • the receiving unit 602 can be used to obtain a received optical signal, wherein the received optical signal includes a reflected optical signal generated by back Rayleigh scattering of the first service optical signal during optical fiber transmission.
  • the processing unit 603 can be used to perform a (1-p)-order fractional Fourier transform on the received optical signal to obtain a fractional Fourier transform spectrum.
  • the peak value of the fractional Fourier transform spectrum corresponds to the energy of the first identification sequence in the reflected optical signal of the first service optical signal.
  • the processing unit 603 can also be used to perform peak detection on the fractional Fourier transform spectrum.
  • the signal strength variation curve of the first identification sequence is measured to obtain the signal strength variation curve of the first identification sequence.
  • the signal strength variation curve can be used to perform fault detection on the optical fiber link between the first node and the second node.
  • the first node may be connected to a plurality of nodes via an optical splitter, and the plurality of nodes may include a second node and a third node.
  • the first node may be an optical line terminal OLT, and the second node and the third node may be optical network units ONU.
  • the sending unit 601 may also be used to send a first OMCI message or a first PLOAM message to the second node, and the first OMCI message or the first PLOAM message is used to indicate the order q.
  • the sending unit 601 may also be used to send a second OMCI message or a second PLOAM message to the third node, and the second OMCI message or the second PLOAM message is used to indicate the order r.
  • the sending unit 601 may be configured to send a second service optical signal to the first node.
  • the receiving unit 602 can be used to obtain a received optical signal, and the obtained received optical signal may include a reflected optical signal generated by the back Rayleigh scattering of the second service optical signal during the optical fiber transmission process.
  • the processing unit 603 can be used to perform a (1-q)-order fractional Fourier transform on the received optical signal obtained by the second node to obtain a fractional Fourier transform spectrum.
  • the peak of the fractional Fourier transform spectrum corresponds to the energy of the second identification sequence in the reflected optical signal of the second service optical signal.
  • the processing unit 603 can also be used to perform peak detection on the fractional Fourier transform spectrum to obtain a signal strength change curve of the second identification sequence.
  • the signal strength change curve can be used to detect faults in the optical fiber link between the second node and the first node.
  • the sending unit 601 may be configured to send a third service optical signal to the first node.
  • the receiving unit 602 can be used to obtain a received optical signal, and the obtained received optical signal may include a reflected optical signal generated by the back Rayleigh scattering of the third service optical signal during the optical fiber transmission process.
  • the processing unit 603 can be used to perform a (1-q)-order fractional Fourier transform on the received optical signal obtained by the third node to obtain a fractional Fourier transform spectrum.
  • the peak of the fractional Fourier transform spectrum corresponds to the energy of the third identification sequence in the reflected optical signal of the third service optical signal.
  • the processing unit 603 can also be used to perform peak detection on the fractional Fourier transform spectrum to obtain a signal strength change curve of the third identification sequence.
  • the signal strength change curve can be used to detect faults in the optical fiber link between the third node and the first node.
  • the communication device and its various units may also be software modules, and the aforementioned optical fiber link fault detection method is implemented by calling the software module through a processor.
  • the processor may be a central processing unit (CPU), an application-specific integrated circuit (ASIC), or a programmable logic device (PLD), and the above-mentioned PLD may be a complex programmable logical device (CPLD), a field programmable gate array (FPGA), a generic array logic (GAL), or any combination thereof.
  • CPU central processing unit
  • ASIC application-specific integrated circuit
  • PLD programmable logic device
  • CPLD complex programmable logical device
  • FPGA field programmable gate array
  • GAL generic array logic
  • the communication device shown in the above drawings is only an example provided by this embodiment. Depending on the online process or different services, the communication device may include more or fewer units, and this application is not limited to this.
  • the hardware can be implemented by a processor or a chip.
  • the chip includes an interface circuit and a control circuit.
  • the interface circuit is used to receive data from other devices outside the processor and transmit it to the control circuit, or send data from the control circuit to other devices outside the processor.
  • control circuit and the interface circuit are used to implement any possible implementation method in the above embodiments through logic circuits or execution code instructions.
  • the beneficial effects can be found in the description of any aspect of the above embodiments, which will not be repeated here.
  • processors in the embodiments of the present application may be a CPU, a neural processing unit (NPU) or a graphic processing unit (GPU), or other general-purpose processors, digital signal processors (DSP), ASICs, FPGAs or other programmable logic devices, transistor logic devices, hardware components or any combination thereof.
  • a general-purpose processor may be a microprocessor or any conventional processor.
  • the communication device 60 shown in FIG6 can also be implemented by a communication device 70, as shown in FIG7, FIG7 is a schematic diagram of the structure of another communication device provided by the present application, the communication device 70 includes: a memory 710 and at least one processor 720, the processor 720 can implement the optical fiber link fault detection method provided in the above embodiment, and the memory 710 is used to store the software instructions corresponding to the above optical fiber link fault detection method.
  • the communication device 70 may refer to a chip or chip system encapsulated with one or more processors 720.
  • the communication device 70 may also include a communication interface 730, which can be used to send and receive data.
  • the communication interface 730 can be implemented by an interface circuit included in the communication device 70.
  • the communication interface 730, the processor 720 and the memory 710 may be connected via a bus 740, and the bus 740 may be divided into an address bus, a data bus, a control bus, and the like.
  • the communication device 70 can also perform the functions of the communication device 60 shown in FIG. 6 , which will not be described in detail here.
  • the communication device 70 provided in this embodiment may be any one of the aforementioned devices, such as the first node, the second node or the third node.
  • the method steps in the embodiments of the present application can also be implemented by a processor executing software instructions.
  • the software instructions can be composed of corresponding software modules, and the software modules can be stored in random access memory (RAM), flash memory, read-only memory (ROM), programmable read-only memory (PROM), erasable programmable read-only memory (EPROM), electrically erasable programmable read-only memory (EEPROM), registers, hard disks, mobile hard disks, CD-ROMs, or any other form of storage medium known in the art.
  • An exemplary storage medium is coupled to the processor so that the processor can read information from the storage medium and write information to the storage medium.
  • the storage medium can also be a component of the processor.
  • the processor and the storage medium can be located in an ASIC.
  • the ASIC can be located in a network device or a terminal device.
  • the processor and the storage medium can also be present in a network device or a terminal device as discrete components.
  • all or part of the embodiments may be implemented by software, hardware, firmware or any combination thereof.
  • all or part of the embodiments may be implemented in the form of a computer program product.
  • the computer program product includes one or more computer programs or instructions. When the computer program or instructions are loaded and executed on a computer, the processes or functions described in the embodiments of the present application are executed in whole or in part.
  • the computer may be a general-purpose computer, a special-purpose computer, a computer network, a network device, a user device or other programmable device.
  • the computer program or instructions may be stored in a computer program or a computer program product.
  • the computer program or instructions may be transmitted from one computer-readable storage medium to another computer-readable storage medium, for example, the computer program or instructions may be transmitted from one website, computer, server or data center to another website, computer, server or data center by wired or wireless means.
  • the computer-readable storage medium may be any available medium that can be accessed by a computer or a data storage device such as a server or data center that integrates one or more available media.
  • the available medium may be a magnetic medium, such as a floppy disk, a hard disk, or a magnetic tape; it may also be an optical medium, such as a digital video disc (DVD); it may also be a semiconductor medium, such as a solid state drive (SSD).
  • “at least one” means one or more, and “more than one” means two or more.
  • “And/or” describes the association relationship of associated objects, indicating that three relationships may exist.
  • a and/or B can mean: A exists alone, A and B exist at the same time, and B exists alone, where A and B can be singular or plural.
  • the character “/” generally indicates that the previous and next associated objects are in an “or” relationship; in the formula of this application, the character “/” indicates that the previous and next associated objects are in a "division” relationship.

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  • Physics & Mathematics (AREA)
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  • Engineering & Computer Science (AREA)
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  • Signal Processing (AREA)
  • Optical Communication System (AREA)

Abstract

L'invention concerne un procédé de détection de défaillance de liaison par fibre optique, un système de communication et un appareil, qui se rapportent au domaine technique des communications optiques. Dans le procédé, un premier signal optique de service envoyé par un premier nœud à un second nœud comprend une première séquence d'identification obtenue au moyen d'une transformée de Fourier fractionnaire d'ordre p ; de plus, le premier nœud met en œuvre une transformée de Fourier fractionnaire d'ordre (1-p) sur un signal optique reçu, de façon à acquérir un spectre de transformée de Fourier fractionnaire, le signal optique reçu comprenant un signal optique réfléchi du premier signal optique de service, et un pic du spectre de transformée de Fourier fractionnaire indiquant l'énergie de la première séquence d'identification ; et en outre, le premier nœud met en œuvre une détection de pic sur le spectre de transformée de Fourier fractionnaire, de façon à obtenir une courbe de changement d'intensité de signal de la première séquence d'identification, la courbe pouvant être utilisée pour mettre en œuvre une détection de défaillance sur une liaison par fibre optique entre le premier nœud et le second nœud. Sur cette base, le premier nœud peut surveiller l'état de la liaison en temps réel pendant un processus de transmission de service sans appareil de détection de réflexion de domaine temporel optique supplémentaire.
PCT/CN2023/102717 2022-10-12 2023-06-27 Procédé de détection de défaillance de liaison par fibre optique, système de communication et appareil WO2024078013A1 (fr)

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