WO2024069740A1 - 推定装置、推定方法及びプログラム - Google Patents

推定装置、推定方法及びプログラム Download PDF

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Publication number
WO2024069740A1
WO2024069740A1 PCT/JP2022/035896 JP2022035896W WO2024069740A1 WO 2024069740 A1 WO2024069740 A1 WO 2024069740A1 JP 2022035896 W JP2022035896 W JP 2022035896W WO 2024069740 A1 WO2024069740 A1 WO 2024069740A1
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Prior art keywords
result
estimation
vibration
transmission signal
chromatic dispersion
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PCT/JP2022/035896
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English (en)
French (fr)
Japanese (ja)
Inventor
健生 笹井
悦史 山崎
秀樹 西沢
由明 曽根
由明 木坂
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NTT Inc
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Nippon Telegraph and Telephone Corp
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Priority to JP2024548863A priority Critical patent/JP7799226B2/ja
Priority to PCT/JP2022/035896 priority patent/WO2024069740A1/ja
Priority to US19/110,998 priority patent/US20260092808A1/en
Publication of WO2024069740A1 publication Critical patent/WO2024069740A1/ja
Anticipated expiration legal-status Critical
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01H—MEASUREMENT OF MECHANICAL VIBRATIONS OR ULTRASONIC, SONIC OR INFRASONIC WAVES
    • G01H9/00—Measuring mechanical vibrations or ultrasonic, sonic or infrasonic waves by using radiation-sensitive means, e.g. optical means
    • G01H9/004—Measuring mechanical vibrations or ultrasonic, sonic or infrasonic waves by using radiation-sensitive means, e.g. optical means using fibre optic sensors
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01H—MEASUREMENT OF MECHANICAL VIBRATIONS OR ULTRASONIC, SONIC OR INFRASONIC WAVES
    • G01H9/00—Measuring mechanical vibrations or ultrasonic, sonic or infrasonic waves by using radiation-sensitive means, e.g. optical means

Definitions

  • the present invention relates to an estimation device, an estimation method, and a program.
  • sensing technology is being considered that estimates the position on the optical fiber where vibrations are induced by vibrations in the external environment, which is the environment outside the optical fiber.
  • An example of a vibration in the external environment is an earthquake.
  • the estimated position is a position on the optical fiber, the vibration of that position is caused by vibrations in the external environment that is in contact with it, so the estimation result indicates the position of the vibration in the external environment.
  • the present invention aims to provide a technology for estimating the position of vibrations induced on an optical fiber for optical communication by vibrations in the external environment without causing a decrease in the frequency utilization efficiency of the optical communication system or signal degradation in other communication channels.
  • One aspect of the present invention is an estimation device that includes a control unit that estimates a vibration position on an optical fiber where vibration is induced by vibration in the external environment, based on a received signal that is the result of a transmission signal, which is an optical signal transmitted from a transmitter, propagating through the optical fiber.
  • the control unit executes estimation processes including a compensation process including a chromatic dispersion compensation process that compensates for chromatic dispersion on the received signal, a transmission signal estimation process that estimates the transmission signal based on the result of the chromatic dispersion compensation process, a chromatic dispersion reapplication process that reapplies the chromatic dispersion to the result of the compensation process, and a vibration position estimation process that estimates the vibration position based on the result of the chromatic dispersion reapplication process and the result of the transmission signal estimation process.
  • a compensation process including a chromatic dispersion compensation process that compensates for chromatic dispersion on the received signal
  • a transmission signal estimation process that estimates the transmission signal based on the result of the chromatic dispersion compensation process
  • a chromatic dispersion reapplication process that reapplies the chromatic dispersion to the result of the compensation process
  • a vibration position estimation process that estimates the vibration position based on the result of the chromatic dispersion
  • One aspect of the present invention is an estimation method having a control step of estimating a vibration position, which is a position on the optical fiber where vibration is induced by vibration in the external environment, based on a received signal that is a result of a transmission signal, which is an optical signal transmitted by a transmitter, propagating through the optical fiber, and the control step executes estimation processes including a compensation process including a chromatic dispersion compensation process that compensates for chromatic dispersion on the received signal, a transmission signal estimation process that estimates the transmission signal based on the result of the chromatic dispersion compensation process, a chromatic dispersion reapplication process that reapplies the chromatic dispersion to the result of the compensation process, and a vibration position estimation process that estimates the vibration position based on the result of the chromatic dispersion reapplication process and the result of the transmission signal estimation process.
  • a compensation process including a chromatic dispersion compensation process that compensates for chromatic dispersion on the received signal
  • One aspect of the present invention is a program for causing a computer to function as the above-mentioned estimation device.
  • the present invention makes it possible to estimate the position on an optical fiber where vibrations are induced by vibrations in the external environment using an optical fiber for optical communications, without causing a decrease in the frequency utilization efficiency of the optical communications system or signal degradation in other communication channels.
  • FIG. 1 is a diagram showing an example of a configuration of an estimation system according to an embodiment.
  • 5A to 5C are explanatory diagrams illustrating an example of a process in which the waveform of an optical signal propagating through an optical fiber in the embodiment is modified.
  • 11 is a flowchart showing an example of the flow of an estimation process in the embodiment.
  • 10 is a flowchart showing an example of the flow of a compensation process in the embodiment.
  • 11 is a flowchart showing an example of a flow of a transmission signal estimation process in the embodiment.
  • 11 is a flowchart showing a first example of a flow of a vibration position estimation process in the embodiment.
  • 10 is a flowchart showing a second example of the flow of a vibration position estimation process in the embodiment.
  • the estimation system 100 includes an optical fiber 1, and estimates a vibration position, which is a position on the optical fiber 1 where vibration is induced by vibration in the external environment.
  • the external environment means an environment outside the optical fiber 1.
  • the optical fiber 1 is an optical fiber that propagates an incident optical signal.
  • the vibration in the external environment is, for example, an earthquake.
  • the estimation system 100 further includes a transmitter 2 and an estimation device 3.
  • the transmitter 2 transmits an optical signal.
  • the optical signal transmitted by the transmitter 2 (hereinafter referred to as the "transmitted signal") is incident on the optical fiber 1.
  • the estimation device 3 receives the optical signal that has propagated through the optical fiber 1. In other words, the estimation device 3 receives the received signal that is the result of the transmission signal propagating through the optical fiber 1. The estimation device 3 estimates the vibration position based on the received signal.
  • the optical fiber 1, the transmitter 2, and the estimation device 3 are also used for optical communications. Therefore, the transmission signal propagates through the optical fiber 1 and reaches the estimation device 3, where it is decoded, and the information transmitted from the transmitter 2 to the estimation device 3 is transmitted to the estimation device 3.
  • the waveform of the transmission signal is deformed while propagating through the optical fiber 1.
  • the deformation is caused, for example, by chromatic dispersion.
  • the deformation is caused, for example, by phase noise applied to the optical signal due to vibrations at the vibration position.
  • FIG. 2 is an explanatory diagram illustrating an example of the process by which the waveform of an optical signal propagating through the optical fiber 1 in an embodiment is deformed. More specifically, FIG. 2 is an explanatory diagram illustrating chromatic dispersion or noise applied to a transmission signal propagating through the optical fiber 1 from the transmitter 2 to the estimation device 3.
  • the transmission signal emitted from the transmitter 2 propagates to position Z on the optical fiber 1, indicated by point P1 in FIG. 2, and chromatic dispersion is applied during propagation.
  • Point P1 is a position on the optical fiber 1 and is the vibration position.
  • phase noise is further added to the transmission signal at position Z.
  • the transmission signal then propagates to the estimation device 3. During this propagation, chromatic dispersion is applied to the transmission signal. In this way, the waveform of the transmission signal propagating through the optical fiber 1 changes from the waveform when it was emitted by the transmitter 2.
  • the estimation device 3 estimates the position where the phase noise related to the transmission signal was applied based on the received signal.
  • the estimation device 3 has a control unit 31 including a processor 91 such as a CPU (Central Processing Unit) and a memory 92 connected by a bus, and executes a program. By executing the program, the estimation device 3 functions as a device including the control unit 31, a receiver 32, a memory unit 33, and an input/output interface 34.
  • a processor 91 such as a CPU (Central Processing Unit)
  • a memory 92 connected by a bus
  • the estimation device 3 functions as a device including the control unit 31, a receiver 32, a memory unit 33, and an input/output interface 34.
  • the processor 91 reads out a program stored in the storage unit 33 and stores the read out program in the memory 92.
  • the processor 91 executes the program stored in the memory 92, whereby the estimation device 3 functions as a device including a control unit 31, a receiver 32, a storage unit 33, and an input/output interface 34.
  • the control unit 31 controls the operation of various functional units equipped in the estimation device 3.
  • the control unit 31 executes, for example, an estimation process.
  • the estimation process includes a compensation process, a transmission signal estimation process, a chromatic dispersion reapplication process, and a vibration position estimation process.
  • the compensation process is a process that includes a chromatic dispersion compensation process.
  • the chromatic dispersion compensation process is a process that compensates for chromatic dispersion in a received signal.
  • the transmission signal estimation process is a process that estimates a transmission signal based on the result of the chromatic dispersion compensation process.
  • the chromatic dispersion compensation process and the transmission signal estimation process are processes that are also executed in optical communications.
  • the chromatic dispersion reapplication process is a process in which the chromatic dispersion is reapplied to the result of the compensation process.
  • the vibration position estimation process is a process in which the vibration position is estimated based on the result of the inverse map of the propagation map acting on the result of the chromatic dispersion reapplication process and the result of the transmission signal estimation process.
  • the propagation map is a map that corresponds to the vibration position and represents the change in the transmission signal due to propagation through the optical fiber 1.
  • the inverse map of the propagation map is a map that represents the inverse event of the event in which the transmission signal propagates through the optical fiber 1 from the transmitter 2 to the receiver 32, that is, the event in which the received signal propagates backwards from the receiver 32 to the transmitter 2.
  • the estimation device 3 estimates the position where the phase noise was applied. Therefore, the control unit 31 deliberately reapplies chromatic dispersion to the result of the chromatic dispersion compensation process that is also performed in existing optical communications so that existing devices used in optical communications can be used. In this way, the control unit 31 makes it possible to return the EEPN to the phase noise before chromatic dispersion was applied.
  • the receiver 32 receives the received signal.
  • the memory unit 33 is configured using a computer-readable storage medium device (non-transitory computer-readable recording medium) such as a magnetic hard disk device or a semiconductor storage device.
  • the memory unit 33 stores various information related to the estimation device 3.
  • the memory unit 33 stores, for example, the results of the processing executed by the control unit 31.
  • the memory unit 33 stores, for example, the results of the estimation processing.
  • the input/output interface 34 inputs and outputs various types of information.
  • the input/output interface 34 is configured to include a display device, such as a CRT (Cathode Ray Tube) display, a liquid crystal display, or an organic EL (Electro-Luminescence) display, as an interface that outputs information.
  • a display device such as a CRT (Cathode Ray Tube) display, a liquid crystal display, or an organic EL (Electro-Luminescence) display, as an interface that outputs information.
  • the interface that outputs information may be configured as an interface that connects these display devices to the estimation device 3.
  • the input/output interface 34 is configured as an interface that accepts information input, for example, as an interface that connects input devices such as a mouse, keyboard, or touch panel to the estimation device 3.
  • the interface that accepts information input may be configured to include these input devices.
  • the input/output interface 34 outputs, for example, the results of processing executed by the control unit 31.
  • the input/output interface 34 outputs, for example, the results of the estimation processing.
  • FIG. 3 is a flowchart showing an example of the flow of the estimation process in the embodiment.
  • the control unit 31 executes a compensation process (step S101).
  • the control unit 31 executes a transmission signal estimation process (step S102).
  • the control unit 31 executes a wavelength dispersion reapplication process (step S103).
  • the control unit 31 executes a vibration position estimation process (step S104).
  • step S102 may be performed at any time after step S101 and before step S104.
  • FIG. 4 is a flowchart showing an example of the flow of compensation processing in an embodiment.
  • the control unit 31 executes chromatic dispersion compensation processing (step S201).
  • the control unit 31 compensates for polarization fluctuation, frequency offset, and carrier phase based on the result of the chromatic dispersion compensation processing (step S202).
  • FIG. 5 is a flowchart showing an example of the flow of the transmission signal estimation process in the embodiment.
  • the control unit 31 determines the symbol to be determined by using the result of the compensation process as the determination target (step S301). Next, the control unit 31 decodes the content indicated by the result of step S301 (step S302). Next, the control unit 31 estimates the transmission signal based on the result of step S302 (step S303).
  • step S302 the results of step S302 are subjected to remapping and filtering using a Nyquist filter.
  • Remapping is a process of assigning information to the amplitude and phase of the light wave.
  • Filtering using a Nyquist filter is a process of narrowing the spectral width of the wave resulting from remapping.
  • FIG. 6 is a flowchart showing a first example of the flow of vibration position estimation processing in an embodiment.
  • the control unit 31 determines candidates for vibration positions according to a predetermined rule (step S401).
  • the control unit 31 executes a first partial compensation process on the processing object as a result of the chromatic dispersion reapplication process (step S402).
  • the first partial compensation process is a process for compensating for the chromatic dispersion applied to the optical signal while the optical signal propagates from the receiver 32 to the position of the candidate determined in step S401, on the processing object.
  • the control unit 31 then performs fixed phase compensation on the processing object as a result of the first partial compensation process (step S403).
  • the fixed phase compensation process is a process in which fixed phase compensation is applied to the processing object at the candidate position estimated in step S401.
  • Equation (1) represents fixed phase compensation.
  • u out represents the result of fixed phase compensation.
  • u in represents the processing target before compensation by fixed phase compensation.
  • the phase ⁇ compensated for in fixed phase compensation is a predetermined value whose value is fixed regardless of the candidate measurement position.
  • the phase ⁇ is an example of a phase fluctuation value.
  • u out,x represents the x-polarized signal output from this process.
  • u out,y represents the y-polarized signal output from this process.
  • u in,x represents the x-polarized signal input from this process.
  • u in,y represents the y-polarized signal input from this process.
  • exp(-j ⁇ ) is an example of a function that approximates the phase fluctuation. j represents the imaginary unit.
  • the control unit 31 then performs a second partial compensation process on the processing object as a result of the fixed phase process (step S404).
  • the second partial compensation process is a process for compensating for the chromatic dispersion applied to the optical signal while the optical signal propagates from the candidate position determined in step S401 to the transmitter 2, on the processing object.
  • the series of processes from steps S402 to S404 is a process for estimating the result of a reversal event of the event in which the transmission signal propagates through the optical fiber 1 from the transmitter 2 to the receiver 32. Therefore, the series of processes from steps S402 to S404 is an example of a process for obtaining a result in which the inverse mapping of the propagation mapping acts on the result of the chromatic dispersion re-application process. Therefore, the result obtained in step S404 is an example of a result in which the inverse mapping of the propagation mapping acts on the result of the chromatic dispersion re-application process.
  • step S404 the control unit 31 obtains the level of signal similarity based on the result obtained in step S404 and the result of the transmission signal estimation process (step S405).
  • the signal similarity is the similarity between the result of the inverse mapping of the propagation mapping acting on the result of the chromatic dispersion reapplication process and the result of the transmission signal estimation process. Therefore, in step S405, the signal similarity is the similarity between the result obtained in step S404 and the result of the transmission signal estimation process.
  • the level of similarity may be evaluated, for example, by correlation or squared error.
  • the control unit 31 determines whether a predetermined termination condition (hereinafter referred to as the "first termination condition") related to obtaining the level of signal similarity is satisfied (step S406).
  • the first termination condition is, for example, a condition that the level of signal similarity has been obtained for all vibration position candidates prepared in advance.
  • step S406 NO
  • the predetermined rule in the process of step S401 is, for example, a rule that determines candidates for the vibration position excluding candidates for which the vibration position has already been estimated.
  • step S406 if the first end condition is satisfied (step S406: YES), the control unit 31 estimates the candidate with the highest signal similarity as the vibration position among the vibration position candidates (step S407). That is, in the vibration position estimation process, the position with the highest signal similarity is estimated to be the vibration position.
  • control unit 31 estimates the vibration position based on the result of the inverse mapping of the propagation mapping acting on the result of the chromatic dispersion reapplication process and the result of the transmission signal estimation process.
  • FIG. 7 is a flowchart showing a second example of the flow of vibration position estimation processing in an embodiment.
  • the control unit 31 determines candidates for vibration positions according to a predetermined rule (step S501).
  • the control unit 31 executes a first partial compensation process on the processing target as a result of the chromatic dispersion reapplication process (step S502).
  • phase fluctuation compensation is a process for compensating the processing object for the phase noise applied at the candidate position estimated in step S501.
  • Phase fluctuation compensation differs from fixed phase compensation in that the angular frequency ⁇ of the phase fluctuation is not fixed.
  • control unit 31 executes a second partial compensation process on the processing target as a result of phase fluctuation compensation (step S504).
  • control unit 31 obtains the level of signal similarity based on the result obtained in step S504 and the result of the transmission signal estimation process (step S505).
  • the signal similarity is the similarity between the result obtained in step S504 and the result of the transmission signal estimation process.
  • the level of similarity may be evaluated, for example, by correlation or squared error.
  • the control unit 31 determines whether a predetermined condition (hereinafter referred to as the "second termination condition") regarding the optimization of the angular frequency ⁇ of the phase fluctuation is satisfied (step S506).
  • the second termination condition is, for example, a condition that the similarity obtained in step S505 is at a maximum. If the second termination condition is not satisfied (step S506: NO), the control unit 31 updates the angular frequency ⁇ of the phase fluctuation in accordance with a predetermined rule (step S507).
  • the predetermined rule is, for example, a rule that the angular frequency ⁇ of the phase fluctuation is updated so as to increase the similarity obtained in step S505.
  • the process returns to step S503.
  • the updated angular frequency ⁇ is used.
  • step S506 determines whether the second end condition is satisfied (step S506). If the first end condition is not satisfied (step S508: NO), the process returns to step S501.
  • the predetermined rule in the process of step S501 is, for example, a rule that determines candidates for the vibration position excluding candidates whose vibration positions have already been estimated.
  • step S508 YES
  • the control unit 31 estimates the candidate with the highest signal similarity as the vibration position among the vibration position candidates (step S509). That is, in the vibration position estimation process, the position with the highest signal similarity is estimated to be the vibration position.
  • control unit 31 estimates the vibration position based on the result of the inverse mapping of the propagation mapping acting on the result of the chromatic dispersion reapplication process and the result of the transmission signal estimation process.
  • the second termination condition may be a condition that the similarity obtained in step S504 is at a maximum (hereinafter referred to as an "example condition").
  • the predetermined rule in step S507 may be a rule that the angular frequency ⁇ of the phase fluctuation is updated so as to increase the similarity obtained in step S505 (hereinafter referred to as an "example rule").
  • the value of ⁇ at the vibration position estimated in step S509 is a value that satisfies the condition for most effectively removing phase noise at the vibration position, compared to other values of ⁇ .
  • the vibration position estimation process in the example of FIG. 7, in which the second termination condition is the above-mentioned condition example and the predetermined rule in step S507 is the above-mentioned rule example is an example of a process in which a removal condition optimization process is executed on one or more of the vibration position candidates.
  • the removal condition optimization process is a process that estimates the condition that best removes phase noise at the vibration position based on the result of the inverse mapping acting on the result of the chromatic dispersion reapplication process and the result of the transmission signal estimation process.
  • the value of ⁇ at the vibration position estimated in step S509 may be a value that satisfies the condition for best removing phase noise at the vibration position compared to other values of ⁇ . Therefore, in estimating the condition for best removing phase noise at the vibration position, for example, the value of the angular frequency of the phase fluctuation at the vibration position is estimated.
  • the estimation device 3 in the embodiment configured in this manner estimates the vibration position based on the result of the inverse map of the propagation map acting on the result of the wavelength dispersion reapplication process and the result of the transmission signal estimation process.
  • it is not necessary to input dedicated light such as an optical pulse into the optical fiber for estimation, and estimation is possible only by signal analysis of the received signal of the communication signal used in optical communication. Therefore, since it does not monopolize a part of the WDM (Wavelength Division Multiplexing) channel of the optical communication, there is no need to reduce the frequency utilization efficiency, and there is an effect that there is no deterioration in the quality of the optical communication signal to other communication channels due to nonlinear optical effects.
  • the estimation device 3 can estimate the vibration position on the optical fiber where vibration is induced by vibration in the external environment using the optical fiber for optical communication without causing a decrease in the frequency utilization efficiency of the optical communication system and signal deterioration of other communication channels.
  • the estimation device 3 in this embodiment configured estimates the vibration position by simply performing signal analysis on the received communication signal. Therefore, there is no need to prepare an additional optical system for the optical communication system in order to estimate the vibration position, and there is also the advantage that no changes need to be made to the configuration of an optical communication system that has already been installed.
  • the control unit 31 may execute the estimation process on a plurality of received signals that have different timings of propagation through the optical fiber 1.
  • the result of such an estimation process is output, for example, from the input/output interface 34.
  • the user of the estimation device 3 can obtain information indicating the time change of the initial phase of the optical signal due to phase noise. Therefore, the user of the estimation device 3 can estimate the frequency of the vibration and the state of the time fluctuation.
  • nth-order (n is an integer equal to or greater than 1) term of the Taylor expansion of exp(-j ⁇ ) may be used as a function approximating the phase variation at the vibration position.
  • the zeroth-order term of the Taylor expansion of exp(-j ⁇ ) is 1. Therefore, the value of the zeroth-order term of the Taylor expansion of exp(-j ⁇ ) does not depend on the value of ⁇ . Therefore, by using a function excluding the zeroth-order term of the Taylor expansion of exp(-j ⁇ ) as the function approximating the phase variation at the vibration position, the control unit 31 can extract only the effect of the change in ⁇ , and estimate the phase with higher accuracy. Therefore, the function approximating the phase variation at the vibration position may be, for example, (-j ⁇ ).
  • the signal similarity may be expressed by any index that represents the similarity between the result of the inverse mapping of the propagation mapping acting on the result of the chromatic dispersion reapplication process and the result of the transmission signal estimation process.
  • the target of the chromatic dispersion reapplication process may be the execution result of step S201, which is the result when the compensations of step S202 are not executed (hereinafter referred to as the "first result").
  • the signal similarity may be, for example, the similarity between the result in which polarization variation, frequency offset, and carrier phase are applied to the result of the transmitted signal estimation process and the first result. Note that each amount applied is the same as the amount of compensation that would have been obtained if compensation had been applied.
  • the process of applying polarization variation, frequency offset, and carrier phase to the result of the transmitted signal estimation process is executed by, for example, the control unit 31.
  • the target of the chromatic dispersion reapplication process may be the execution result of step S201, which is the result in which the compensation for polarization fluctuation in the compensation of step S202 is not executed (hereinafter referred to as the "second result").
  • the signal similarity may be, for example, the similarity between the result in which polarization fluctuation is applied to the result of the transmitted signal estimation process and the second result. Note that each amount applied is the same as the amount of compensation that would have been obtained if compensation had been applied.
  • the process of applying polarization fluctuation to the result of the transmitted signal estimation process is executed by, for example, the control unit 31.
  • the target of the chromatic dispersion reapplication process may be the execution result of step S201, which is the result in which the compensation of frequency offset among the compensations of step S202 is not performed (hereinafter referred to as the "third result").
  • the signal similarity may be, for example, the similarity between the result in which a frequency offset is applied to the result of the transmitted signal estimation process and the third result. Note that each amount applied is the same as the amount of compensation that would have been obtained if compensation had been performed.
  • the process of applying a frequency offset to the result of the transmitted signal estimation process is performed by, for example, the control unit 31.
  • the target of the chromatic dispersion reapplication process may be the execution result of step S201, which is the result in which the compensation of the carrier phase among the compensations of step S202 is not performed (hereinafter referred to as the "fourth result").
  • the signal similarity may be, for example, the similarity between the result in which the carrier phase is applied to the result of the transmitted signal estimation process and the fourth result. Note that each amount applied is the same as the amount of compensation that would have been obtained if compensation had been performed.
  • the process of applying the carrier phase to the result of the transmitted signal estimation process is performed by, for example, the control unit 31.
  • the target of the chromatic dispersion reapplication process may be the execution result of step S201, which is the result in which the compensation for polarization fluctuation and frequency offset in the compensation of step S202 is not performed (hereinafter referred to as the "fifth result").
  • the signal similarity may be, for example, the similarity between the result in which polarization fluctuation and frequency offset are applied to the result of the transmitted signal estimation process and the fifth result. Note that each amount applied is the same as the amount of compensation that would have been obtained if compensation had been performed.
  • the process of applying polarization fluctuation and frequency offset to the result of the transmitted signal estimation process is performed by, for example, the control unit 31.
  • the target of the chromatic dispersion reapplication process may be the execution result of step S201, which is the result in which the compensation for frequency offset and carrier phase of the compensation in step S202 is not performed (hereinafter referred to as the "sixth result").
  • the signal similarity may be, for example, the similarity between the result in which frequency offset and carrier phase are applied to the result of the transmitted signal estimation process and the sixth result. Note that each amount applied is the same as the amount of compensation that would have been obtained if compensation had been performed.
  • the process of applying frequency offset and carrier phase to the result of the transmitted signal estimation process is performed by, for example, the control unit 31.
  • the target of the chromatic dispersion reapplication process may be the execution result of step S201, which is the result in which compensation for carrier phase and polarization fluctuations in the compensation of step S202 is not performed (hereinafter referred to as the "seventh result").
  • the signal similarity may be, for example, the similarity between the seventh result and the result in which carrier phase and polarization fluctuations are applied to the result of the transmitted signal estimation process. Note that each amount applied is the same as the amount of compensation that would have been obtained if compensation had been performed.
  • the process of applying carrier phase and polarization fluctuations to the result of the transmitted signal estimation process is performed, for example, by the control unit 31.
  • the signal similarity may be evaluated based on the similarity between the amplitudes of the two signals.
  • the estimation device 3 may be implemented using a plurality of information processing devices communicably connected via a network. In this case, each functional unit of the estimation device 3 may be distributed and implemented in the plurality of information processing devices.
  • All or part of the functions of the estimation device 3 may be realized using hardware such as an ASIC (Application Specific Integrated Circuit), a PLD (Programmable Logic Device), or an FPGA (Field Programmable Gate Array).
  • the program may be recorded on a computer-readable recording medium. Examples of computer-readable recording media include portable media such as flexible disks, optical magnetic disks, ROMs, and CD-ROMs, and storage devices such as hard disks built into computer systems.
  • the program may be transmitted via a telecommunications line.

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PCT/JP2022/035896 2022-09-27 2022-09-27 推定装置、推定方法及びプログラム Ceased WO2024069740A1 (ja)

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