WO2022185475A1 - 光伝送装置、光伝送システム及び光伝送方法 - Google Patents
光伝送装置、光伝送システム及び光伝送方法 Download PDFInfo
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- H04—ELECTRIC COMMUNICATION TECHNIQUE
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- H04J14/00—Optical multiplex systems
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- H04J14/0221—Power control, e.g. to keep the total optical power constant
- H04J14/02216—Power control, e.g. to keep the total optical power constant by gain equalization
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- the present invention relates to an optical transmission device, an optical transmission system, and an optical transmission method capable of properly controlling the intensity of an optical signal.
- an optical communication system such as a submarine cable system
- communication is performed by transmitting and receiving wavelength division multiplexed optical signals, in which multiple optical signals with different wavelengths are multiplexed, between land terminals.
- the intensities of the plurality of optical signals included in the wavelength division multiplexed optical signal are adjusted to appropriate signal intensities for system design, and then output from the terminal station to the submarine transmission line.
- spectrum sharing which allocates bands of wavelength division multiplexed optical signals to different users, has been practiced.
- each user manages an optical transmitter so that an optical signal is output with an appropriate signal strength for system design.
- the intensity of the optical signal may fluctuate due to aging deterioration or failure of the optical transmitter that outputs the optical signal and the land transmission line that connects the optical transmitter to the land terminal station. Therefore, techniques are used to adjust the intensity of the optical signal.
- Patent Document 1 discloses that the intensity of an optical signal included in a wavelength division multiplexed optical signal is adjusted to be uniform.
- Patent Document 2 describes a related technique.
- the gain characteristic of the amplifier installed in the submarine transmission line causes the intensity of the optical signal included in the wavelength division multiplexed optical signal to fluctuate. It also affects the intensity of optical signals other than signals.
- the present invention has been made in view of the above problems, and an object of the present invention is to restore the strength of an optical signal when the strength of the optical signal fluctuates due to aged deterioration or failure of a transmitter, a land transmission line, or the like.
- An optical transmission device, an optical transmission system, and an optical transmission method are provided.
- the optical transmission device of the present invention is wavelength selective switching means for attenuating each of the plurality of optical signals output from the plurality of optical transmitting means according to the attenuation amount, and multiplexing and outputting the attenuated optical signals; light detection means for detecting the intensity of at least one of said plurality of light signals and comparing it to a first threshold and a second threshold higher than said first threshold; If the intensity of the optical signal whose intensity is detected is lower than a first threshold based on the result of the comparison, the wavelength selective switching means reduces the attenuation amount for the optical signal, By increasing the attenuation amount for the optical signal when the intensity of the detected optical signal is higher than the second threshold, the intensity of the optical signal whose intensity is detected is increased to the first threshold. and the second threshold.
- the optical transmission system of the present invention is the optical transmission device described above; and a plurality of the optical transmission means.
- the optical transmission method of the present invention is Attenuate each of the plurality of optical signals output from the plurality of optical transmission means according to the attenuation amount; multiplexing and outputting the attenuated optical signal; detecting the intensity of at least one of the plurality of optical signals and comparing it to a first threshold and a second threshold higher than the first threshold; reducing the attenuation for the optical signal if the intensity of the optical signal whose intensity is detected falls below a first threshold based on the result of the comparison; By increasing the attenuation amount for the optical signal when the intensity becomes higher than the second threshold, the intensity of the optical signal whose intensity is detected is increased between the first threshold and the second threshold.
- the attenuation amount is controlled so as to have a value between.
- an optical transmission device, an optical transmission system, and an optical transmission method are capable of recovering the intensity of an optical signal when the intensity of the optical signal fluctuates due to aged deterioration or failure of a transmitter, a land transmission line, or the like. can be provided.
- FIG. 1 is a block diagram showing a configuration example of an optical transmission system according to a first embodiment of the present invention
- FIG. 1 is a diagram for explaining an optical transmission system according to a first embodiment of the present invention
- FIG. 1 is a diagram for explaining an optical transmission system according to a first embodiment of the present invention
- FIG. 4 is a flow chart showing the operation of the optical transmission system according to the first embodiment of the present invention
- 4 is a flow chart showing the operation of the optical transmission system according to the first embodiment of the present invention
- 4 is a flow chart showing the operation of the optical transmission system according to the first embodiment of the present invention
- FIG. 5 is a block diagram showing a configuration example of an optical transmission device according to a second embodiment of the present invention
- 8 is a flow chart showing the operation of the optical transmission device according to the second embodiment of the present invention
- FIG. 1 is a block diagram showing a configuration example of an optical transmission system 1. As shown in FIG. 2 and 3 are diagrams for explaining the details of the optical transmission system. FIG. 4 is a flow chart showing an operation example of the optical transmission system 1 .
- the optical transmission system 1 includes data centers 10A, 10B, 10C, an optical transmission device 20, land transmission lines 30A, 30B, 30C, and an undersea transmission line 40.
- each of the data centers 10A, 10B, and 10C is referred to as the data center 10 when there is no need to distinguish between the data centers 10A, 10B, and 10C.
- each of the land transmission lines 30A, 30B, and 30C is referred to as a land transmission line 30 when it is not necessary to distinguish between the land transmission lines 30A, 30B, and 30C.
- the data center 10 includes an optical transmitter 11 and a control device 12.
- the optical transmitter 11 corresponds to optical transmission means.
- the optical transmitter 11 outputs an optical signal to the optical transmission device 20 via the land transmission line 30 .
- the optical transmitter 11 outputs an optical signal with a preset intensity.
- the optical transmitter 11 can adjust the intensity of the optical signal according to instructions from the control device 12 .
- optical transmitter 11 is an optical transponder.
- a plurality of optical transmitters 11 may be provided in the data center 10 .
- the data center 10 outputs to the optical transmission device 20 a wavelength division multiplexed optical signal obtained by multiplexing the optical signals output from the plurality of optical transmitters 11 .
- the control device 12 controls the optical transmitter 11 .
- the control device 12 can cause the optical transmitter 11 to output an optical signal of that intensity.
- the control device 12 can communicate with the optical transmission device 20 and notifies the user of the optical transmitter 11 of the information received from the optical transmission device 20 .
- the controller 12 receives an alarm indicating an abnormality of the optical signal from the alarm signal generating means 24 described later, the controller 12 notifies the user of the optical transmitter 11 of the occurrence of the abnormality.
- the optical transmission device 20 includes wavelength selection switching means 22 , light detection means 23 , alarm signal generation means 24 and branching means 25 .
- the optical transmission device 20 is connected to a plurality of data centers 10 via land transmission lines 30 .
- the wavelength selective switching means 22 attenuates each of the plurality of optical signals output from the plurality of optical transmitters 11 according to the attenuation amount, multiplexes the attenuated optical signals, and outputs a wavelength division multiplexed optical signal.
- the wavelength selective switching means 22 attenuates each of the plurality of optical signals output from the optical transmitters 11 in the data centers 10A, 10B, and 10C by a predetermined attenuation amount.
- the wavelength selective switching means 22 is, for example, WSS (Wavelength Selective Switch).
- the WSS demultiplexes an input optical signal by wavelength, reflects each of the demultiplexed optical signals by a mirror, multiplexes the reflected optical signals, and outputs them as a wavelength division multiplexed optical signal.
- the WSS can adjust the amount of attenuation for each optical signal by adjusting the angle of the mirror that reflects each demultiplexed optical signal.
- the wavelength division multiplexed optical signal output from the wavelength selective switching means 22 is branched by the branching means 25 and output toward the submarine transmission line 40 and the light detecting means 23 .
- the branching means 25 is, for example, an optical coupler.
- the data center 10A outputs to the optical transmission device 20 a wavelength division multiplexed optical signal in which the optical signal A and the optical signal B shown in FIG. 2 are multiplexed. Also, the data center 10B outputs an optical signal C to the optical transmission device 20, and the data center 10C outputs an optical signal D to the optical transmission device 20.
- FIG. 1 the data center 10A outputs to the optical transmission device 20 a wavelength division multiplexed optical signal in which the optical signal A and the optical signal B shown in FIG. 2 are multiplexed.
- the data center 10B outputs an optical signal C to the optical transmission device 20
- the data center 10C outputs an optical signal D to the optical transmission device 20.
- optical signals A, B, C, and D shown in FIG. 2 are input to the wavelength selective switching means 22 .
- the wavelength selection switching means 22 a plurality of center wavelengths and wavelength intervals around each center wavelength as shown in FIG. 2 are set as a plurality of transmission bands.
- the wavelength selective switching means 22 cuts off light outside the transmission band by maximizing attenuation in bands other than the transmission band.
- the wavelength selective switching unit 22 attenuates the intensity of the optical signal in the transmission band to a reference value set for each transmission band.
- the amount of attenuation in the transmission band in the wavelength selective switching means 22 is the difference between the preset intensity of the optical signal and the reference value.
- a first threshold and a second threshold larger than the first threshold are set in the transmission band.
- the optical detection means 23 detects the intensity of each of the plurality of optical signals based on the wavelength division multiplexed optical signals output from the wavelength selective switching means 22 . Specifically, the light detection means 23 receives the wavelength division multiplexed optical signal branched by the branching means 25 . The light detection means 23 detects the intensity of the optical signal in a plurality of transmission bands by calculating the intensity for each unit wavelength.
- the photodetector 23 includes, for example, an optical spectrum analyzer.
- the photodetector 23 also stores the first threshold and the second threshold set for each transmission band. For example, as shown in FIG. 3, when the light detection means 23 detects that the intensity of the optical signal A within the transmission band has fallen below the first threshold value, the attenuation amount for the transmission band in the wavelength selection switching means 22 is lower the Thereby, the wavelength selective switching means 22 increases the intensity of the optical signal A in the wavelength division multiplexed optical signal. On the other hand, when the light detection means 23 detects that the intensity of the optical signal A within the transmission band exceeds the second threshold value, the wavelength selection switching means 22 increases the attenuation for the transmission band. Thereby, the wavelength selective switching means 22 reduces the intensity of the optical signal. As described above, the intensity of the optical signal within the transmission band is kept between the first threshold and the second threshold by the photodetector 23 and the wavelength selection switcher 22 .
- the warning signal generating means 24 generates a warning signal when at least one of the case where the intensity of the optical signal is below the first threshold and the case where the intensity of the optical signal is above the second threshold.
- the warning signal generating means 24 generates a warning signal when at least one of the optical signals A, B, C, D as shown in FIG. 2 falls below a first threshold.
- the warning signal generating means 24 also generates a warning signal when at least one of the optical signals A, B, C, D as shown in FIG. 2 exceeds a second threshold.
- the alarm signal generating means 24 notifies the terminal station in which the optical transmission device 20 is installed of the abnormality of the optical signal when generating the alarm signal.
- the alarm signal generating means 24 stores the address (for example, MAC (Media Access Control) address, IP (Internet Protocol) address, etc.) of the control device 12 that controls the optical transmitter 11 that outputs the optical signal. and For example, the alarm signal generator 24 associates the address of the control device 12 in the data center 10A with the optical signal A and the optical signal B and stores them. Further, the alarm signal generating means 24 stores the address of the control device 12 in the data center 10B in association with the optical signal C, and stores the address of the control device 12 in the data center 10C in association with the optical signal D. .
- MAC Media Access Control
- IP Internet Protocol
- the alarm signal generating means 24 When the intensity of the optical signal falls below the first threshold value or the intensity of the optical signal exceeds the second threshold value, the alarm signal generating means 24 generates an optical signal to the address associated with the optical signal. Notification of signal anomalies. As a result, the user of the optical transmitter 11 in the data center 10 can recognize that the optical signal is abnormal.
- FIGS. 4, 5 and 6 are flow charts showing an operation example of the optical transmission system 1.
- FIG. 4, 5 and 6 are flow charts showing an operation example of the optical transmission system 1.
- the optical transmitter 11 outputs an optical signal to the optical transmission device 20 (S101).
- the two optical transmitters 11 in the data center 10A output the optical signal A and the optical signal B.
- FIG. The optical transmitter 11 in the data center 10B outputs the optical signal C
- the optical transmitter 11 in the data center 10C outputs the optical signal D.
- the wavelength selective switching means 22 attenuates the optical signal (S102).
- optical signals A, B, C, and D are input to the wavelength selective switching means 22 .
- the wavelength selective switching means 22 demultiplexes each of the optical signals A to D for each wavelength and gives a predetermined amount of attenuation to each of the optical signals A to D.
- FIG. the wavelength selective switching unit 22 attenuates the optical signal by the difference between the preset intensity of the optical signal and the reference value set for the optical signal. As a result, each optical signal attenuated by the wavelength selective switching means 22 has the intensity of the reference value as shown in FIG.
- the wavelength selective switching means 22 multiplexes the attenuated optical signals and outputs a wavelength division multiplexed optical signal (S103).
- the photodetector 23 detects the intensity of the optical signal (S104). Specifically, the light detection means 23 receives the wavelength division multiplexed optical signal branched by the branching means 25 and detects the intensity of the optical signal contained in the wavelength division multiplexed optical signal.
- the photodetector 23 By selecting one of the plurality of transmission bands, the photodetector 23 identifies the optical signal within the transmission band as the optical signal to be adjusted (S105). In this operation example, the photodetector 23 selects at least one of the transmission bands in which each of the optical signals A to D is located, and specifies one of the optical signals A to D as the optical signal to be adjusted. do. For example, the photodetector 23 identifies the optical signal A, which has the shortest center wavelength among the optical signals A to D, as an adjustment target.
- the light detection means 23 determines whether the intensity of the optical signal is lower than the first threshold (S106). Specifically, when the optical signal A is specified as an adjustment target in S105 described above, the optical detection means 23 detects the intensity of the optical signal A in the transmission band associated with the optical signal A. Determine if it is less than a threshold of 1.
- the photodetector 23 determines whether the intensity of the optical signal is higher than the second threshold (S107). ). For example, the light detection means 23 determines whether the intensity of the optical signal A is higher than a second threshold set for the transmission band associated with the optical signal A. If it is not determined that the intensity of the optical signal is higher than the second threshold (No in S107), the photodetector 23 determines whether or not all optical signals are subject to adjustment (S108). Specifically, the photodetector 23 determines whether or not all of the optical signals A to D included in the wavelength multiplexed optical signal have been specified as adjustment targets in S105.
- the light detection means 23 stores the transmission band of the optical signal specified in S105, and compares it with the transmission band set in the wavelength selection switching means 22 to specify all the optical signals as adjustment targets. determine whether or not Further, when it is determined that all the optical signals are subject to adjustment (Yes in S108), the adjustment of the attenuation amount for the wavelength selective switching means 22 ends. Specifically, the operations of S101 to S103 in the optical transmission system 1 are continuously executed, but the operations of S104 to S118 are not executed.
- the photodetector 23 performs the processing of S105.
- the photodetector 23 identifies an optical signal that has not been identified as an adjustment target optical signal as a new adjustment target. For example, if the optical signal A was identified as an adjustment target in S105 previously executed, the light detection means 23 identifies one of the optical signals BD as a new adjustment target. .
- the warning signal generating means 24 when it is determined that the intensity of the optical signal to be adjusted is lower than the first threshold (Yes in S106), the warning signal generating means 24 generates a warning signal as shown in FIG. (S109).
- the light detection means 23 notifies the alarm signal generation means 24 of information indicating the optical signal to be adjusted.
- the alarm signal generating means 24 notifies the terminal station in which the optical transmission device 20 is provided that an abnormality has occurred in the notified optical signal. Further, the alarm signal generating means 24 generates an alarm signal including information indicating the notified optical signal, and transmits the alarm signal to the address associated with the optical signal.
- the controller 12 in the data center 10 can receive the alarm signal, so that the user of the optical transmitter 11 in the data center 10 can know that an abnormality has occurred in the optical signal.
- the light detection means 23 detects the difference between the intensity of the optical signal whose intensity is below the first threshold and the first threshold (S110).
- the photodetector 23 determines whether the difference between the intensity of the optical signal and the first threshold is greater than the attenuation applied to the optical signal (S111). If it is determined that the difference is larger than the attenuation amount (Yes in S111), the light detection means 23 notifies the wavelength selection/switching means 22 and the alarm signal generation means 24 (S112). For example, the light detection means 23 notifies the wavelength selective switching means 22 to set the attenuation amount for the transmission band of the optical signal to zero.
- the light detection means 23 notifies the warning signal generation means 24 of the difference between the difference between the intensity of the optical signal and the first threshold value and the attenuation amount before being set to zero, and the transmission band of the optical signal.
- the alarm signal generating means 24 notifies the address associated with the transmission band of the optical signal to increase the output of the optical transmitter 11 by the difference notified from the light detecting means 23 .
- the intensity of the optical signal falls below the first threshold even if the attenuation amount in the wavelength selective switching means 22 is set to zero, the intensity of the optical signal output from the optical transmitter 11 is reduced to Can be notified to increase.
- the user of the optical transmitter 11 who has received the notification increases the output of the optical transmitter 11, thereby adjusting the intensity of the optical signal to exceed the first threshold.
- the wavelength selection/switching means 22 If the light detection means 23 does not determine that the difference is greater than the attenuation amount (No in S111), the wavelength selection/switching means 22 outputs the intensity of the optical signal whose intensity is below the first threshold and the first and the transmission band of the optical signal. As a result, the wavelength selective switching means 22 reduces the attenuation amount in the notified pass band by the notified difference (S113). Note that the wavelength selective switching unit 22 may decrease the attenuation amount by an amount obtained by adding a predetermined amount to the notified difference. Thereby, in the optical transmission system 1, the intensity of the optical signal whose intensity has fallen below the first threshold can be increased.
- the photodetector 23 determines whether or not all optical signals are subject to adjustment (S114). Specifically, the photodetector 23 performs the same processing as S108. Further, when it is determined that all the optical signals are subject to adjustment (Yes in S114), the adjustment of the attenuation amount for the wavelength selective switching means 22 ends. Specifically, the operations of S101 to S103 in the optical transmission system 1 are continuously executed, but the operations of S104 to S118 are not executed.
- the photodetector 23 performs the processing of S105.
- the photodetector 23 identifies an optical signal that has not been identified as an adjustment target optical signal as a new adjustment target, similarly to the process of S105 after the process of S108.
- the light detection means 23 notifies the alarm signal generation means 24 of information indicating the optical signal to be adjusted.
- the alarm signal generating means 24 notifies the terminal station in which the optical transmission device 20 is provided that an abnormality has occurred in the notified optical signal. Further, the alarm signal generating means 24 generates an alarm signal including information indicating the notified optical signal, and transmits the alarm signal to the address associated with the optical signal.
- the controller 12 in the data center 10 can receive the alarm signal, so that the user of the optical transmitter 11 in the data center 10 can know that an abnormality has occurred in the optical signal.
- the light detection means 23 detects the difference between the intensity of the optical signal whose intensity exceeds the second threshold and the second threshold (S116). At this time, the light detection means 23 notifies the wavelength selection switching means 22 of the detected difference and the transmission band of the optical signal.
- the wavelength selective switching means increases the attenuation (S117). Specifically, the amount of attenuation of the optical signal in the transmission band notified from the photodetector 23 is increased by the notified difference. Note that the wavelength selective switching unit 22 may increase the attenuation amount by an amount obtained by adding a predetermined amount to the notified difference. Thereby, in the optical transmission system 1, the intensity of the optical signal whose intensity exceeds the second threshold can be reduced.
- the photodetector 23 determines whether or not all optical signals are subject to adjustment (S118). Specifically, the photodetector 23 performs the same processing as S108. Further, when it is determined that all the optical signals are subject to adjustment (Yes in S118), the adjustment of the attenuation amount for the wavelength selective switching means 22 ends. Specifically, the operations of S101 to S103 in the optical transmission system 1 are continuously executed, but the operations of S104 to S118 are not executed.
- the photodetector 23 when it is determined that at least one of the optical signals included in the wavelength multiplexed optical signal is not specified as an adjustment target (No in S118), the photodetector 23 performs the processing of S105. In the process of S105, the photodetector 23 identifies an optical signal that has not been identified as an adjustment target optical signal as a new adjustment target, similarly to the process of S105 after the process of S108.
- the photodetector 23 determines in the process of S108 shown in FIG. 4 that all the optical signals are subject to adjustment (Yes in S108), then in the process of S114 shown in FIG. If it is determined that the optical signal of the wavelength Attenuation adjustment for the selection switching means 22 is completed. On the other hand, after each process, the process from S104 may be executed again without ending the adjustment of the attenuation amount for the wavelength selective switching means 22 . This allows the intensity of the optical signal to be continuously adjusted between the first threshold and the second threshold. When executing the process of S104 again, the photodetector 23 stores the information as not specifying any of the optical signals as adjustment targets.
- the optical transmission system 1 includes the wavelength selection switching means 22 and the light detection means 23 .
- the wavelength selective switching means 22 attenuates each of the plurality of optical signals output from the plurality of optical transmitting means (optical transmitters 11) according to the attenuation amount, multiplexes the attenuated optical signals, and outputs the multiplexed optical signals.
- the light detection means 23 also detects the intensity of each of the plurality of optical signals and compares it with a first threshold and a second threshold higher than the first threshold. Further, the wavelength selective switching means 22 reduces the attenuation of the optical signal when the intensity of the optical signal becomes lower than the first threshold based on the result of the comparison, and the intensity of the optical signal becomes lower than the first threshold.
- the wavelength selective switching means 22 controls the attenuation amount so that the intensity of the optical signal whose intensity is detected is between the first threshold value and the second threshold value.
- the intensity of the optical signal input to the optical transmission device 20 may fluctuate due to aged deterioration or failure of the optical transmitter that outputs the optical signal and the land transmission line from the optical transmitter to the land terminal station. In the optical transmission system 1, even if the intensity of the optical signal fluctuates, the intensity of the optical signal can be restored between the first threshold and the second threshold.
- FIG. 7 is a block diagram showing a configuration example of the optical transmission device 2.
- FIG. 8 is a flow chart showing an operation example of the optical transmission device 2.
- the optical transmission device 2 includes wavelength selective switching means 22 and optical detection means 23 .
- the wavelength selective switching means 22 attenuates each of the plurality of optical signals output from the plurality of optical transmission means according to the attenuation amount, multiplexes the attenuated optical signals, and outputs them. Also, it is assumed that a wavelength division multiplexed optical signal is output to the wavelength selective switching means 22 from a data center or the like (not shown). Note that the wavelength selective switching means 22 in the optical transmission device 2 may have the same configuration, function, and connection relationship as the wavelength selective switching means 22 in the optical transmission system 1 .
- the light detection means 23 detects the intensity of at least one of the plurality of optical signals.
- the light detection means 23 also compares the detected intensity with a first threshold and a second threshold higher than the first threshold.
- the photodetector 23 in the optical transmission device 2 may have the same configuration, function, and connection as the photodetector 23 in the optical transmission system 1 .
- the light detection means 23 notifies the wavelength selection/switching means 22 of the result of comparison between the detected intensity and each of the first threshold and the second threshold.
- the wavelength selective switching means 22 reduces the attenuation of the optical signal when the intensity of the optical signal becomes lower than the first threshold based on the result of the comparison by the optical detection means 23 . Further, based on the result of the comparison by the photodetector 23, the wavelength selective switching means 22 adjusts the attenuation of the optical signal when the intensity of the optical signal is higher than a second threshold higher than the first threshold. increase. Thereby, the wavelength selective switching means 22 controls the attenuation amount for the optical signal so that the intensity of the optical signal whose intensity is detected is between the first threshold value and the second threshold value.
- the optical transmission device 2 may include branching means 25 as shown in FIG.
- the branching means 25 is unnecessary, for example, when there is no need to output the light from the wavelength selective switching means 22 to the outside.
- optical transmission device 2 The operation of the optical transmission device 2 will be described based on FIG.
- the wavelength selective switching means 22 attenuates the optical signal (S201).
- the wavelength selective switching means 22 multiplexes and outputs the attenuated optical signal (S202).
- the photodetector 23 detects the intensity of at least one of the plurality of optical signals (S203). The photodetector 23 determines whether the intensity of the detected optical signal is lower than the first threshold (S204).
- the wavelength selection switching means 22 Attenuation is reduced for optical signals having intensities below the first threshold.
- the light detection means 23 determines that the intensity is Determine whether the intensity of the detected at least one optical signal is higher than a second threshold (S206).
- the wavelength selection switching means 22 Increase the attenuation for optical signals with intensities higher than a threshold of 2.
- the optical detection means 23 does not determine that the intensity of any of the detected optical signals is higher than the second threshold value (No in S206)
- the optical transmission device 2 does not operate. finish.
- the optical transmission device 2 includes the wavelength selection switching means 22 and the light detection means 23 .
- the wavelength selective switching means 22 attenuates each of the plurality of optical signals output from the plurality of optical transmitting means according to the attenuation amount, multiplexes the attenuated optical signals, and outputs the multiplexed optical signals.
- the light detection means 23 detects the intensity of at least one of the plurality of optical signals and compares it with a first threshold and a second threshold higher than the first threshold. Furthermore, based on the result of the comparison, the wavelength selective switching means 22 reduces the attenuation of the optical signal when the intensity of the optical signal becomes lower than the first threshold, and the intensity of the optical signal becomes lower than the first threshold. If it is higher than a second threshold higher than , the attenuation for the optical signal is increased. Thereby, the wavelength selective switching unit 22 controls the attenuation amount so that the intensity of the optical signal becomes a value between the first threshold and the second threshold.
- the intensity of the optical signal input to the optical transmission device 2 may fluctuate due to aged deterioration or failure of the optical transmitter that outputs the optical signal and the land transmission line from the optical transmitter to the land terminal station. In the optical transmission device 2, even if the intensity of the optical signal fluctuates, the intensity of the optical signal can be restored between the first threshold and the second threshold.
- Optical Transmission System 2 Optical Transmission Devices 10, 10A, 10B, 10C Data Center 11 Optical Transmitter 12 Control Device 20 Optical Transmission Device 22 Wavelength Selection Switching Means 23 Light Detection Means 24 Alarm Signal Generation Means 25 Branching Means
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Abstract
Description
複数の光送信手段から出力された複数の光信号の各々を減衰量に応じて減衰させ、減衰した光信号を多重化して出力する波長選択切替手段と、
前記複数の光信号の少なくとも一つの強度を検出し、第1の閾値及び前記第1の閾値よりも高い第2の閾値と比較する光検出手段と、を備え、
前記波長選択切替手段は、前記比較の結果に基づいて、強度が検出された前記光信号の強度が第1の閾値よりも低くなった場合は前記光信号に対する前記減衰量を減少させ、強度が検出された前記光信号の強度が前記第2の閾値よりも高くなった場合は前記光信号に対する前記減衰量を増加させることにより、強度が検出された前記光信号の強度が前記第1の閾値と前記第2の閾値の間の値になるように前記減衰量を制御する。
前述の光伝送装置と、
複数の前記光送信手段と、を備える。
複数の光送信手段から出力された複数の光信号の各々を減衰量に応じて減衰させ、
前記減衰された前記光信号を多重化して出力し、
前記複数の光信号のうちの少なくとも一つの強度を検出し、第1の閾値及び前記第1の閾値よりも高い第2の閾値と比較し、
前記比較の結果に基づいて、強度が検出された前記光信号の強度が第1の閾値よりも低くなった場合は前記光信号に対する前記減衰量を減少させ、強度が検出された前記光信号の強度が前記第2の閾値よりも高くなった場合は前記光信号に対する前記減衰量を増加させることにより、強度が検出された前記光信号の強度が前記第1の閾値と前記第2の閾値の間の値になるように前記減衰量を制御する。
第1の実施形態における光伝送システム1について、図1、図2、図3及び図4に基づき説明する。図1は、光伝送システム1の構成例を示すブロック図である。また、図2および図3は、光伝送システムの詳細を説明するための図である。図4は、光伝送システム1の動作例を示すフローチャートである。
<第2の実施形態>
第2の実施形態における光伝送装置2について、図7及び図8に基づき説明する。図7は、光伝送装置2の構成例を示すブロック図である。また、図8は、光伝送装置2の動作例を示すフローチャートである。図7に示されるように、光伝送装置2は、波長選択切替手段22及び光検出手段23を備える。
2 光伝送装置
10、10A、10B、10C データセンタ
11 光送信機
12 制御装置
20 光伝送装置
22 波長選択切替手段
23 光検出手段
24 警報信号生成手段
25 分岐手段
Claims (8)
- 複数の光送信手段から出力された複数の光信号の各々を減衰量に応じて減衰させ、減衰した光信号を多重化して出力する波長選択切替手段と、
前記複数の光信号の少なくとも一つの強度を検出し、第1の閾値及び前記第1の閾値よりも高い第2の閾値と比較する光検出手段と、を備え、
前記波長選択切替手段は、前記比較の結果に基づいて、強度が検出された前記光信号の強度が前記第1の閾値よりも低くなった場合は前記光信号に対する前記減衰量を減少させ、強度が検出された前記光信号の強度が前記第2の閾値よりも高くなった場合は前記光信号に対する前記減衰量を増加させることにより、強度が検出された前記光信号の強度が前記第1の閾値と前記第2の閾値の間の値になるように前記減衰量を制御する、光伝送装置。 - 前記光信号の強度が前記第1の閾値よりも低くなった場合又は前記光信号の強度が前記第2の閾値よりも高くなった場合に、警報信号を生成する警報信号生成手段を更に備える、請求項1に記載の光伝送装置。
- 前記警報信号生成手段は、前記光信号を出力した前記光送信手段の制御装置に対して、前記警報信号を送信する、請求項2に記載の光伝送装置。
- 前記波長選択切替手段は、陸上に設けられた陸上伝送路を介して、前記複数の光送信機から入力された前記複数の光信号の各々を減衰させ、多重化した前記光信号を海底に設けられた海底伝送路に向けて出力する、
請求項1から3の何れか1項に記載の光伝送装置。 - 前記波長選択切替手段は、前記光信号の帯域幅毎に前記減衰量を調整する請求項1から4の何れか1項に記載の光伝送装置。
- 請求項1から5の何れか1項に記載の光伝送装置と、
前記複数の光送信手段と、を備える
光伝送システム。 - 前記光信号の強度が前記第1の閾値よりも低くなり、前記光信号の強度と前記第1の閾値との差分が前記減衰量よりも大きい場合、前記光信号を出力する前記光送信手段は、前記光信号の強度を増加させる、請求項6に記載の光伝送システム。
- 複数の光送信手段から出力された複数の光信号の各々を減衰量に応じて減衰させ、
前記減衰した前記光信号を多重化して出力し、
前記複数の光信号のうちの少なくとも一つの強度を検出し、第1の閾値及び前記第1の閾値よりも高い第2の閾値と比較し、
前記比較の結果に基づいて、強度が検出された前記光信号の強度が前記第1の閾値よりも低くなった場合は前記光信号に対する前記減衰量を減少させ、強度が検出された前記光信号の強度が前記第2の閾値よりも高くなった場合は前記光信号に対する前記減衰量を増加させることにより、強度が検出された前記光信号の強度が前記第1の閾値と前記第2の閾値の間の値になるように前記減衰量を制御する、光伝送方法。
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