WO2024057393A1 - 光給電方法、光給電システム及び光給電装置 - Google Patents

光給電方法、光給電システム及び光給電装置 Download PDF

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Publication number
WO2024057393A1
WO2024057393A1 PCT/JP2022/034187 JP2022034187W WO2024057393A1 WO 2024057393 A1 WO2024057393 A1 WO 2024057393A1 JP 2022034187 W JP2022034187 W JP 2022034187W WO 2024057393 A1 WO2024057393 A1 WO 2024057393A1
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Prior art keywords
optical
power supply
optical power
power
signal
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Ceased
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PCT/JP2022/034187
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English (en)
French (fr)
Japanese (ja)
Inventor
遼 宮武
陽一 深田
宏明 桂井
真良 関口
智暁 吉田
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NTT Inc
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Nippon Telegraph and Telephone Corp
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Application filed by Nippon Telegraph and Telephone Corp filed Critical Nippon Telegraph and Telephone Corp
Priority to PCT/JP2022/034187 priority Critical patent/WO2024057393A1/ja
Priority to PCT/JP2023/022746 priority patent/WO2024057651A1/ja
Priority to JP2024546717A priority patent/JPWO2024057651A1/ja
Publication of WO2024057393A1 publication Critical patent/WO2024057393A1/ja
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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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
    • H04B10/80—Optical aspects relating to the use of optical transmission for specific applications, not provided for in groups H04B10/03 - H04B10/70, e.g. optical power feeding or optical transmission through water

Definitions

  • the present invention relates to an optical power supply method, an optical power supply system, and an optical power supply device.
  • FIG. 8 is a diagram showing an example of the configuration of an optical power supply system using a conventional optical power supply method.
  • an optical signal is transmitted from a light source installed in a station building, etc., to a power supply target area, which is an unelectrified area, through an optical power supply line using an optical fiber.
  • a power supply target area which is an unelectrified area
  • an SS (Single Star) configuration without branching is used in order to reduce branching loss.
  • a PD Photodiode
  • the received optical signal is converted into an electrical signal and supplied as power to devices within the power supply target area.
  • the amount of power supplied is smaller than, for example, a general power feeding method using a commercial power supply, a metal wire, etc. Therefore, with conventional optical power supply methods, sufficient power may not be obtained to operate devices in the power supply target area.
  • a method of increasing the amount of light from a light source can be considered, but in that case, there is a problem that safety may be compromised due to heating of the optical fiber.
  • the present invention has been made in view of the above technical background, and aims to provide a technology that can increase the amount of power supplied without compromising safety in optical power supply.
  • One aspect of the present invention includes the step of a first light source transmitting a first optical signal for optical power supply to a first optical power supply line, and a step of the power supply unit transmitting the first optical signal using a first photodiode.
  • receiving a signal and converting the first optical signal into an electrical signal to obtain a first electric power a step of transmitting the second optical signal to a power feeding line; and a step of the power feeding unit receiving the second optical signal by a second photodiode and converting the second optical signal into an electrical signal to obtain a second electric power.
  • an optical power feeding method including the step of the power feeding unit outputting power that is a combination of the first power and the second power to a power feeding target device.
  • one aspect of the present invention is an optical power supply system including a first light source, a second light source, and an optical power supply device, wherein the first light source is a first light source for optical power supply.
  • the optical power supply device transmits a signal to a first optical power supply line
  • the second light source transmits a second optical signal to a second optical power supply line, which is a line of a passive optical network
  • the optical power supply device a first photodiode that receives a first optical signal and converts the received first optical signal into an electrical signal to obtain a first electric power; a second photodiode that converts the second optical signal into an electrical signal to obtain second power; and a second photodiode that outputs power that is a combination of the first power and the second power to the power supply target device.
  • This is an optical power feeding system including a power feeding unit.
  • one aspect of the present invention is to receive a first optical signal for optical power supply transmitted from a first light source and transmitted via a first optical power supply line, and to transmit the received first optical signal.
  • a first photodiode that converts the signal into an electrical signal to obtain the first electric power
  • a second photodiode that receives an optical signal and converts the received second optical signal into an electrical signal to obtain a second power
  • a combination of the first power and the second power is an optical power supply device including a power supply unit that outputs the generated power to a power supply target device.
  • the present invention makes it possible to increase the amount of power supplied without compromising safety in optical power supply.
  • FIG. 1 is an overall configuration diagram of an optical power feeding system 1 according to a first embodiment of the present invention.
  • 1 is a flowchart showing the operation of the optical power supply system 1 in the first embodiment of the present invention.
  • FIG. 7 is a diagram for explaining the data capacity used in the PON of the optical power supply system 1a in the second embodiment of the present invention. It is a flow chart which shows operation of optical power supply system 1a in a 2nd embodiment of the present invention.
  • FIG. 2 is an overall configuration diagram of an optical power feeding system 1b according to a third embodiment of the present invention. It is an overall block diagram of the optical power feeding system 1c in the 4th Embodiment of this invention. It is a flow chart which shows operation of optical power supply system 1c in a 4th embodiment of the present invention.
  • 1 is a diagram showing an example of the configuration of an optical power supply system using a conventional optical power supply method.
  • FIG. 1 is an overall configuration diagram of an optical power feeding system 1 according to a first embodiment of the present invention.
  • the optical power supply system 1 is a system for supplying power by optical power supply to equipment that operates on electric power (hereinafter referred to as "power supply target equipment") that exists in a power supply target area, which is a non-electrified area, for example. be.
  • the power supply target device is, for example, a device such as an ONU (Optical Network Unit) that requires a large amount of power to drive and is required to be driven for a long time.
  • the optical power supply system 1 includes a light source 11, a light source 12, and an optical power supply section 2.
  • the optical power supply unit 2 includes two PDs (Photodiodes). As shown in FIG. 1, the optical power supply unit 2 includes a PD 20-1 and a PD 20-2.
  • the optical power supply section 2 is installed, for example, inside or near the power supply target area. Note that the PD 20-1 and the PD 20-2 may be provided together in the casing of one device, or may be provided in the casings of separate devices.
  • the light source 11 is installed in a building such as a station building of a communications base station. This station building is located, for example, away from the area to be powered.
  • the light source 11 emits an optical signal for optical power supply.
  • An optical signal that is always on may be used as the optical signal for optical power supply.
  • the optical signal emitted by the light source 11 is transmitted to the optical power supply unit 2 via the optical power supply line 51.
  • the optical power supply line 51 is configured using optical fiber. As a network configuration for the optical power supply line 51, for example, a single star (SS) configuration without branching is used in order to reduce branching loss.
  • SS single star
  • the optical signal sent out by the light source 11 is received by the PD 20-1 of the optical power supply unit 2.
  • the PD 20-1 obtains power by converting the received optical signal into an electrical signal.
  • the light source 12 is installed, for example, in a building such as a station building. This station building is, for example, located away from the power supply area and other station buildings where the light sources 11 are installed.
  • the light source 12 is a light source for transmitting an optical signal carrying communication data from the station building to a plurality of users' homes.
  • a PON (Passive Optical Network) configuration is used as a network configuration between the light source 12 and the ONU in the user's home.
  • the optical signal sent from the light source 12 is split by an optical splitter installed on the network path, and is received by the ONU in the user's home.
  • the optical splitter is installed on a telephone pole or the like and branches the optical signal transmitted from the light source 12 into eight directions.
  • one of the plurality of network paths branched by the optical splitter is connected to the PD 20-2 of the optical power supply section 2. Therefore, the optical signal sent out by the light source 12 is also received by the PD 20-2 of the optical power supply section 2.
  • the PD 20-2 obtains power by converting the received optical signal into an electrical signal.
  • the present embodiment is applicable to a case where at least one network path among a plurality of network paths branched by an optical splitter is not used for transmitting communication data to the user's home and is terminated unused.
  • an unused network path in a PON installed near a power supply target area is utilized for optical power supply to the power supply target area.
  • optical signals flow to all terminals of a network path branched by an optical splitter, so this optical signal is transmitted to unused terminals. It is not utilized and is wasted.
  • This embodiment attempts to utilize this wasted optical signal for optical power supply.
  • the PD 20-2 obtains power by receiving an optical signal (existing signal) carrying communication data transmitted from the PON station to the user's home.
  • a PD to be connected to each of the plurality of unused network routes is prepared in the optical power supply unit 2. You can also do this. Thereby, the amount of power supplied to the power supply target area can be further increased.
  • the network path connected from the light source 12 to the PD 20-2 is the optical power supply line 52 in FIG.
  • the PON network including the optical power supply line 52 is constructed using optical fibers.
  • PD20-1 and PD20-2 in the first embodiment are connected in series. As shown in Figure 1, the electric power obtained by PD20-1 is output to PD20-2, and the electric power obtained by PD20-1 and the electric power obtained by PD20-2 are combined in the power supply area. Output to the device to be powered. Note that the order in which the PDs 20-1 and 20-2 are connected in series may be reversed to the order shown in FIG.
  • the optical power supply system 1 in the first embodiment uses the optical power supply line 51 of the SS configuration network that transmits the optical signal sent out from the light source 11 as the main optical power supply line, and the optical power supply line 51 that transmits the optical signal sent out from the light source 12
  • the optical power supply line 52 which is one of the network paths of the PON configuration for transmitting optical signals, is used as a sub optical power supply line to supply optical power to the power supply target area.
  • the network configuration of the optical power supply line 51 is not limited to the SS configuration, and may be other network configurations such as a PON configuration.
  • FIG. 2 is a flowchart showing the operation of the optical power supply system 1 in the first embodiment of the present invention.
  • the light source 11 sends an optical signal for power supply to the PD 20-1 (first PD) via the optical power supply line 51 having the SS configuration (step S101).
  • the PD 20-1 (first PD) receives the optical signal transmitted by the optical power supply line 51 having the SS configuration (step S102).
  • the PD 20-1 (first PD) converts the received optical signal into an electrical signal and outputs the obtained power to the PD 20-2 (second PD) (step S103).
  • the light source 12 sends out an optical signal, which is an existing signal for data communication, to the PON (step S104).
  • the PD 20-2 receives the optical signal transmitted through the optical power supply line 52, which is one of the network paths branched by the optical splitter of the PON (step S105).
  • PD20-2 converts the received optical signal into an electrical signal, and combines the obtained power with the power input from PD20-1 (first PD) to generate power within the power supply area. (Step S106). With this, the operation of the optical power supply system 1 shown in the flowchart of FIG. 2 is completed.
  • the optical power supply system 1 in the first embodiment uses not only the power obtained by the optical power supply optical signal sent from the light source 11 but also the power obtained by the optical power supply optical signal transmitted from the light source 12 by the PON. Power can also be obtained from optical signals.
  • the optical power supply system 1 according to the first embodiment is able to reduce the amount of power supplied in optical power supply, which is generally considered to have a smaller amount of power than a general power supply method using a commercial power source, metal wire, etc. can be increased.
  • the optical power supply system 1 in the first embodiment there is no need to increase the light amount of the existing light source 11 and the light amount of the existing light source 12 in order to increase the amount of power supplied, so heating of the optical fiber etc. occurs. Not at all. Therefore, the optical power supply system 1 according to the first embodiment can increase the amount of power supplied without compromising safety in optical power supply.
  • power can also be obtained from the optical signal transmitted from the light source 12 by the PON, so conventionally, the setting is set to be high in order to obtain the desired large power.
  • the optical power supply system 1 in the first embodiment can utilize the existing light source 11, the existing optical power supply line 51, and the existing PD 20-1. Furthermore, the optical power supply system 1 in the first embodiment can utilize the existing light source 12, existing optical splitter, etc. of the PON system. Therefore, in the optical power supply system 1 in the first embodiment, it is only necessary to newly install the PD 20-2 and connect an unused network path among the network paths branched by the optical splitter in the PON to the PD 20-2. .
  • the optical power supply system 1 according to the first embodiment can be constructed without significantly modifying the existing system, and therefore the installation cost can be kept low. Furthermore, the optical power supply system 1 according to the first embodiment can effectively utilize wasteful optical signals flowing through unused network paths in the PON for optical power supply.
  • PON There are multiple standards for PON, such as GE-PON (Gigabit Ethernet-Passive Optical Network) and 10G-EPON (10Gigabit-Ethernet-Passive Optical Network), but unused terminals of PONs of multiple standards are used. It is also conceivable to construct a structure in which a plurality of optical fibers are installed in the power supply target area.
  • GE-PON Gigabit Ethernet-Passive Optical Network
  • 10G-EPON 10Gigabit-Ethernet-Passive Optical Network
  • the optical signal sent from the light source 12 is an existing signal for data communication
  • the PD 20-2 is configured to obtain power from the optical signal, which is an existing signal for data communication.
  • the optical signal sent from the light source 12 is an optical signal in which an additional signal for optical power supply is added to the existing signal for data communication. Therefore, in the second embodiment, it is assumed that there is sufficient free space in the data capacity that can be communicated by the PON.
  • optical power supply system configuration The overall configuration of the optical power feeding system 1a in the second embodiment is the same as the overall configuration of the optical power feeding system 1 in the first embodiment described with reference to FIG. 1, so the description thereof will be omitted.
  • the configuration of the optical power supply system 1a in the second embodiment differs from the configuration of the optical power supply system 1 in the second embodiment in that the light source 12 adds an additional signal for optical power supply to the existing signal for data communication. The point is to send the added optical signal to the PON.
  • the additional signal for optical power supply for example, a constantly lit optical signal may be used as in the case of general optical power supply.
  • FIG. 3 is a diagram for explaining the data capacity used in the PON of the optical power supply system 1a in the second embodiment of the present invention. It is assumed that the capacity limit of the data capacity of the PON of the optical power feeding system 1a in the second embodiment is, for example, 1 Gbps.
  • the graph on the left side of FIG. 3 shows an example of changes in the amount of data transmitted by the PON when an additional signal for optical power supply is not added to the existing signal for data communication. That is, it can be said that the graph on the left side of FIG. 3 represents an example of the change in the amount of data transmitted by the PON of the optical power supply system 1 in the first embodiment described above.
  • the graph on the left side of Figure 3 shows a case where the amount of actually used data is only about 20 to 30% of the data capacity limit of the PON of the optical power supply system 1a, and there is sufficient free space in the data capacity. ing.
  • the graph on the right side of FIG. 3 shows an example of the change in the amount of data transmitted by the PON when an additional signal for optical power supply is added to the existing signal for data communication.
  • the graph on the right side of FIG. 3 shows a case where the amount of data of the optical signal for optical power supply added as an additional signal is approximately 0.5 Gbps.
  • the optical power feeding system 1a in the second embodiment can increase the light amount of the light source 12 within a safe range compared to the optical power feeding system 1 in the first embodiment described above. Can be done.
  • the optical power supply system 1a according to the second embodiment can supply more power to the power supply target devices existing in the power supply target area than the optical power supply system 1 according to the first embodiment described above. can.
  • the optical power supply unit 2 may monitor the amount of data of the existing signal for data communication transmitted on the PON line at regular intervals.
  • the optical power supply unit 2 may detect the availability status of the PON line from the maximum value of data amount in the most recent period.
  • the optical power supply unit 2 may perform linear prediction based on the gradient of change in data amount, instead of making the determination based on the maximum value of the data amount, and predict the availability status from the predicted value. .
  • the optical power supply unit 2 may predict the availability information based on the amount of data at the same time in the past.
  • the optical power supply unit 2 may determine the data amount of the additional signal for optical power supply based on the detected availability status. At this time, the optical power supply unit 2 may provide a margin for the amount of data of the additional signal so as not to interfere with existing communication performed by the PON. For example, if the maximum amount of data in the most recent period in a 1 [Gbps] line is 0.2 [Gbps], the remaining 0.8 [Gbps] is free. In such a case, the optical power supply unit 2 sets a predetermined margin of 0.2 [Gbps], for example, and determines the data amount of the additional signal for optical power supply to 0.6 [Gbos]. Good too.
  • the optical power supply unit 2 notifies the light source 12 of information indicating the determined amount of data.
  • the light source 12 sends out to the PON an optical signal obtained by adding an additional signal for optical power supply to an existing signal for data communication, it adds the additional signal of the notified data amount.
  • the function of detecting the availability status of the PON line and the function of determining the data amount of the additional signal described above are performed by a device on the light source 12 side or an individual installed device instead of the optical power supply section 2.
  • the configuration may be included in the illustrated control device.
  • FIG. 4 is a flowchart showing the operation of the optical power supply system 1a in the second embodiment of the present invention.
  • the light source 11 sends an optical signal for power supply to the PD 20-1 (first PD) via the optical power supply line 51 having the SS configuration (step S201).
  • the PD 20-1 (first PD) receives the optical signal transmitted by the optical power supply line 51 having the SS configuration (step S202).
  • the PD 20-1 (first PD) converts the received optical signal into an electrical signal and outputs the obtained power to the PD 20-2 (second PD) (step S203).
  • the optical power supply unit 2 monitors the amount of data of the existing signal for data communication transmitted on the PON line at regular intervals.
  • the optical power supply unit 2 detects the availability of the PON line from the maximum value of the data amount in each period, etc. (step S204).
  • the optical power supply unit 2 determines the data amount of the additional signal for optical power supply based on the detected availability status (step S205).
  • the optical power supply unit 2 notifies the light source 12 of information indicating the determined amount of data.
  • the light source 12 (second light source) sends to the PON an optical signal in which an additional signal for optical power supply is added to an existing signal for data communication (step S206). At this time, the light source 12 adds an additional signal of the notified data amount.
  • the PD 20-2 receives the optical signal transmitted through the optical power supply line 52, which is one of the network paths branched by the optical splitter of the PON (step S207).
  • PD20-2 converts the received optical signal into an electrical signal, and combines the obtained power with the power input from PD20-1 (first PD) to generate power within the power supply area. (Step S208). Thereafter, the processes from step S204 to step S208 are repeated.
  • the optical power supply system 1a in the second embodiment uses not only the power obtained by the optical power supply optical signal sent from the light source 11 but also the power obtained by the optical power supply optical signal transmitted from the light source 12 by the PON. Power can also be obtained from optical signals.
  • the optical power supply system 1a according to the second embodiment can reduce the amount of power supplied in optical power supply, which is generally considered to have a smaller amount of power than a general power supply method using a commercial power source, metal wire, etc. can be increased.
  • the optical power supply system 1a in the second embodiment there is no need to increase the light amount of the existing light source 11 in order to increase the amount of power supplied, and the light amount of the existing light source 12 can be adjusted to the data capacity of the PON. Since the increase is carried out safely within limits, heating of the optical fiber does not occur. Therefore, the optical power supply system 1a according to the second embodiment can increase the amount of power supplied without compromising safety in optical power supply.
  • electric power can also be obtained from the optical signal transmitted from the light source 12 by the PON.
  • the optical power supply system 1a in the second embodiment can utilize the existing light source 11, the existing optical power supply line 51, and the existing PD 20-1. Further, in the optical power feeding system 1a in the second embodiment, the existing light source 12, existing optical splitter, etc. of the PON system can be utilized. Therefore, in the optical power supply system 1a in the second embodiment, a new PD 20-2 is installed, and an unused network path among the network paths branched by the optical splitter in the PON is connected to the PD 20-2, and data communication is performed. It is only necessary to have the light source 12 send out to the PON an optical signal in which an additional signal for optical power supply is added to the existing signal for the optical power supply.
  • the optical power supply system 1a in the second embodiment can be constructed without significantly modifying an existing system, so installation costs can be kept low. Further, the optical power supply system 1a in the second embodiment can effectively utilize wasteful optical signals flowing through unused network paths in the PON for optical power supply.
  • a third embodiment of the present invention will be described below.
  • the optical power supply system 1 in the first embodiment and the optical power supply system 1a in the second embodiment described above in addition to the power obtained by the optical signal for optical power supply sent out from the light source 11, the light source of one PON The configuration was such that power was obtained from optical signals transmitted from 12.
  • the optical power supply system 1b in the third embodiment described below in addition to the power obtained by the optical power supply optical signal sent from the light source 11, the power is transmitted from each of the light sources 12 of a plurality of PONs. This is a configuration that obtains power from optical signals.
  • FIG. 5 is an overall configuration diagram of an optical power feeding system 1b according to a third embodiment of the present invention.
  • the optical power supply system 1b is a system for supplying power by optical power supply to power supply target devices that operate on electric power and are present in a power supply target area, which is a non-electrified area, for example.
  • the optical power supply system 1b includes a light source 11, a plurality of (N-1) light sources 12, and an optical power supply section 2b.
  • the optical power supply unit 2b includes N PDs. Note that N is a natural number of 3 or more. As shown in FIG. 5, the optical power supply unit 2b includes PD20-1 to PD20-N. The optical power supply unit 2b is installed, for example, inside or near the power supply target area. Note that the PD20-1 to PD20-N may be provided together in the casing of one device, or may be provided in the casings of separate devices. Further, some of the PDs 20-1 to 20-N may be provided together in a housing of one device.
  • the light source 11 is installed, for example, in a building such as a station building. This station building, for example, exists in a location away from the power supply target area.
  • the light source 11 sends out an optical signal for optical power supply.
  • the optical signal sent out by the light source 11 is transmitted to the optical power supply unit 2b via the optical power supply line 51.
  • the optical power supply line 51 is configured using an optical fiber.
  • As the network configuration of the optical power supply line 51 for example, an SS configuration without branching is used for the purpose of reducing branching loss.
  • the optical signal sent out by the light source 11 is received by the PD 20-1 of the optical power supply section 2b.
  • the PD 20-1 obtains power by converting the received optical signal into an electrical signal.
  • Each of the light sources 12 is installed in a building, such as a station building, for example.
  • This station building is located away from, for example, the power supply target area, other station buildings where light sources 11 are installed, and other station buildings where other light sources 12 are installed.
  • the light source 12 is a light source for transmitting an optical signal carrying communication data from the station building to a plurality of users' homes.
  • a PON configuration is used as the network configuration between the light source 12 and the ONU in the user's home.
  • the optical signal sent from the light source 12 is split by an optical splitter installed on the network path, and is received by the ONU in the user's home.
  • one of the plurality of network paths branched by the optical splitter is connected to any one of PD20-2 to PD20-N of the optical power supply unit 2b. Therefore, the optical signal sent out by the light source 12 is also received by any one of the PDs 20-2 to 20-N of the optical power supply section 2.
  • PD20-2 to PD20-N each receive optical signals transmitted by different PONs. The PD20-2 to PD20-N each obtain electric power by converting the received optical signal into an electrical signal.
  • the optical splitter when at least one network path among the plurality of network paths branched by the optical splitter is not used for transmitting communication data to the user's home and is terminated as unused. is assumed.
  • an unused network path in a PON installed near a power supply target area is utilized for optical power supply to the power supply target area.
  • the PDs 20-2 to 20-N obtain power by receiving optical signals carrying communication data transmitted from the PON station to the user's home.
  • the optical signal carrying communication data transmitted from the PON station to the user's home may be an existing signal for data communication as in the optical power supply system 1 in the first embodiment, or may be an existing signal for data communication as in the optical power supply system 1 in the first embodiment.
  • the optical signal may be an optical signal in which an additional signal for optical power supply is added to an existing signal for data communication.
  • optical splitters there are multiple PON optical splitters near the power supply area, it is up to you which optical splitter to use, but for example, select the desired optical splitter in order from the one installed closest to the power supply area. A number of optical splitters may be used.
  • the network paths connected from the light source 12 to the PDs 20-2 to 20-N are the optical power supply lines 52 in FIG. 5.
  • the PON network including the optical power supply line 52 is constructed using optical fibers.
  • PD20-1 to PD20-N in the third embodiment are connected in series. As shown in FIG. 5, the power obtained by PD20-1 is output to PD20-2, and the power obtained by PD20-1 and the power obtained by PD20-2 are combined and output to PD20-3. Finally, all of the power obtained in PD20-1 to PD20-N is output to the power supply target devices within the power supply target area. Note that the order in which the PD20-1 to PD20-N are connected in series may be arbitrary.
  • the optical power supply system 1b in the third embodiment can obtain power using all the optical signals sent out from the light sources 12 of the plurality of PONs.
  • the optical power supply system 1b in the third embodiment can transmit more power to the power supply target area than the optical power supply system 1 in the first embodiment and the optical power supply system 1a in the second embodiment described above. It is possible to supply power to the target equipment located in the area.
  • the optical power supply system 1b in the third embodiment uses the optical power supply line 51 of the SS configuration network that transmits the optical signal sent out from the light source 11 as the main optical power supply line, and the optical power supply line 51 that transmits the optical signal sent out from the light source 12.
  • the optical power supply line 52 which is one of the network paths of each of the plurality of PON configurations that transmit optical signals, is used as a sub optical power supply line to supply optical power to the power supply target area.
  • the network configuration of the optical power supply line 51 is not limited to the SS configuration, and may be other network configurations such as a PON configuration.
  • the optical power supply system 1b in the third embodiment uses not only the power obtained by the optical power supply optical signal sent from the light source 11 but also the optical signal transmitted from the light sources 12 of a plurality of PONs. Electricity can also be obtained from each.
  • the optical power supply system 1b according to the third embodiment can reduce the amount of power supplied in optical power supply, which is generally considered to have a smaller amount of power than a general power supply method using a commercial power source, metal wire, etc. can be increased.
  • the optical power supply system 1b in the third embodiment there is no need to increase the light amount of the existing light source 11 and the light amount of the existing light source 12 in order to increase the amount of power supplied, so heating of the optical fiber etc. occurs. Not at all. Therefore, the optical power supply system 1b in the third embodiment can increase the amount of power supplied without compromising safety in optical power supply.
  • electric power can also be obtained from the optical signal transmitted from the light source 12 by the PON, so conventionally the power should be set high to obtain the desired large electric power.
  • the optical power supply system 1b in the third embodiment can utilize the existing light source 11, the existing optical power supply line 51, and the existing PD 20-1. Furthermore, in the optical power supply system 1b in the third embodiment, the existing light source 12, existing optical splitter, etc. of the PON system can be utilized. Therefore, in the optical power supply system 1b in the third embodiment, PD20-2 to PD20-N are newly installed, and unused network paths branched by optical splitters in a plurality of PONs are connected to PD20-N. 2 to PD20-N, respectively.
  • the optical power feeding system 1b in the third embodiment can be constructed without significantly modifying the existing system, and therefore the installation cost can be kept low. Furthermore, the optical power supply system 1b according to the third embodiment can effectively utilize wasteful optical signals flowing through unused network paths in the PON for optical power supply.
  • the optical power feeding system 1 in the first embodiment, the optical power feeding system 1a in the second embodiment, and the optical power feeding system 1b in the second embodiment described above have a configuration in which a plurality of PDs are connected in series.
  • An optical power supply system 1c in a fourth embodiment described below has a configuration in which a plurality of PDs are connected in parallel.
  • FIG. 6 is an overall configuration diagram of an optical power feeding system 1c according to a fourth embodiment of the present invention.
  • the optical power supply system 1c is a system for supplying power by optical power supply to power supply target devices operated by electric power, which are present in a power supply target area, which is a non-electrified area, for example.
  • the optical power supply system 1 includes a light source 11, a light source 12, and an optical power supply section 2c.
  • the optical power supply unit 2c includes two PDs. As shown in FIG. 6, the optical power supply unit 2c includes a PD 20-1 and a PD 20-2. The optical power supply unit 2c is installed, for example, inside or near the power supply target area. Note that the PD 20-1 and the PD 20-2 may be provided together in the casing of one device, or may be provided in the casings of separate devices.
  • the light source 11 is installed, for example, in a building such as a station building. This station building, for example, exists in a location away from the power supply target area.
  • the light source 11 sends out an optical signal for optical power supply.
  • the optical signal sent out by the light source 11 is transmitted to the optical power supply unit 2c via the optical power supply line 51.
  • the optical power supply line 51 is configured using an optical fiber.
  • As the network configuration of the optical power supply line 51 for example, an SS configuration without branching is used for the purpose of reducing branching loss.
  • the optical signal sent out by the light source 11 is received by the PD 20-1 of the optical power supply section 2c.
  • the PD 20-1 obtains power by converting the received optical signal into an electrical signal.
  • the light source 12 is installed, for example, in a building such as a station building. This station building is, for example, located away from the power supply area and other station buildings where the light sources 11 are installed.
  • the light source 12 is a light source for transmitting an optical signal carrying communication data from the station building to a plurality of users' homes.
  • a PON configuration is used as the network configuration between the light source 12 and the ONU in the user's home.
  • the optical signal sent from the light source 12 is split by an optical splitter installed on the network path, and is received by the ONU in the user's home.
  • one of the plurality of network paths branched by the optical splitter is connected to the PD 20-2 of the optical power supply section 2c. Therefore, the optical signal sent out by the light source 12 is also received by the PD 20-2 of the optical power supply section 2.
  • the PD 20-2 obtains power by converting the received optical signal into an electrical signal.
  • the optical splitter when at least one network path among the plurality of network paths branched by the optical splitter is not used for transmitting communication data to the user's home and is terminated as unused. is assumed.
  • an unused network path in a PON installed near a power supply target area is utilized for optical power supply to the power supply target area.
  • the PD 20-2 obtains power by receiving an optical signal carrying communication data transmitted from the PON station to the user's home.
  • the optical signal carrying communication data transmitted from the PON station to the user's home may be an existing signal for data communication as in the optical power supply system 1 in the first embodiment, or may be an existing signal for data communication as in the optical power supply system 1 in the first embodiment.
  • the optical signal may be an optical signal in which an additional signal for optical power supply is added to an existing signal for data communication.
  • the network path connected from the light source 12 to the PD 20-2 is the optical power supply line 52 in FIG.
  • the PON network including the optical power supply line 52 is constructed using optical fibers.
  • the PD20-1 and PD20-2 in the fourth embodiment are connected in parallel. As shown in FIG. 6, the power obtained by the PD 20-1 is output to the power supply target devices within the power supply target area. Furthermore, the power obtained by the PD 20-2 is also output to the power supply target devices within the power supply target area.
  • the optical power supply system 1c in the fourth embodiment connects the PD20-1 and PD20-2 in parallel, the current can be increased more than when the PD20-1 and PD20-2 are connected in series. can be raised.
  • the optical power feeding system 1 in the first embodiment, the optical power feeding system 1a in the second embodiment, and the optical power feeding system 1b in the third embodiment have a plurality of PDs connected in series. , the voltage can be increased more than when multiple PDs are connected in parallel.
  • the optical power supply system 1c in the fourth embodiment uses the optical power supply line 51 of the SS configuration network that transmits the optical signal sent out from the light source 11 as the main optical power supply line, and the optical power supply line 51 that transmits the optical signal sent out from the light source 12 is
  • the optical power supply line 52 which is one of the network paths of the PON configuration for transmitting optical signals, is used as a sub optical power supply line to supply optical power to the power supply target area.
  • the network configuration of the optical power supply line 51 is not limited to the SS configuration, and may be other network configurations such as a PON configuration.
  • FIG. 7 is a flowchart showing the operation of the optical power supply system 1 in the first embodiment of the present invention.
  • the light source 11 sends out an optical signal for power supply to the PD 20-1 (first PD) via the optical power supply line 51 having the SS configuration (step S401).
  • the PD 20-1 (first PD) receives the optical signal transmitted by the optical power supply line 51 having the SS configuration (step S402).
  • the PD 20-1 (first PD) converts the received optical signal into an electrical signal and supplies the obtained power to the power supply target device within the power supply target area (step S403).
  • the light source 12 sends an optical signal to the PON (step S404).
  • the optical signal sent from the light source 12 may be an existing signal for data communication, or an additional signal for optical power supply may be added to the existing signal for data communication. It may also be an optical signal.
  • the PD 20-2 (second PD) receives the optical signal transmitted through the optical power supply line 52, which is one of the network paths branched by the optical splitter of the PON (step S405).
  • the PD 20-2 (second PD) converts the received optical signal into an electrical signal and supplies the obtained power to the power supply target device within the power supply target area (step S406). With this, the operation of the optical power supply system 1c shown in the flowchart of FIG. 7 is completed.
  • the optical power supply system 1c in the fourth embodiment uses, in addition to the power obtained by the optical signal for optical power supply sent from the light source 11, the power for data communication transmitted by the PON from the light source 12. Power can also be obtained from optical signals. As a result, the optical power supply system 1c in the fourth embodiment can reduce the amount of power supplied in optical power supply, which is generally considered to have a smaller amount of power than a general power supply method using a commercial power source, metal wire, etc. can be increased.
  • the optical power supply system 1c in the fourth embodiment there is no need to increase the light amount of the existing light source 11 and the light amount of the existing light source 12 in order to increase the amount of power supplied, so heating of the optical fiber etc. occurs. Not at all. Therefore, the optical power supply system 1c in the fourth embodiment can increase the amount of power supplied without compromising safety in optical power supply.
  • electric power can also be obtained from the optical signal transmitted by the PON from the light source 12.
  • the optical power supply system 1c in the fourth embodiment can utilize the existing light source 11, the existing optical power supply line 51, and the existing PD 20-1. Further, in the optical power supply system 1c in the fourth embodiment, the existing light source 12, existing optical splitter, etc. of the PON system can be utilized. Therefore, in the optical power feeding system 1c in the fourth embodiment, it is only necessary to newly install the PD 20-2 and connect an unused network path among the network paths branched by the optical splitter in the PON to the PD 20-2. .
  • the optical power supply system 1c in the fourth embodiment can be constructed without significantly modifying the existing system, and therefore the installation cost can be kept low. Further, the optical power supply system 1c in the fourth embodiment can effectively utilize wasteful optical signals flowing through unused network paths in the PON for optical power supply.
  • the optical power supply system includes a first light source, a second light source, and an optical power supply device.
  • the optical power supply system is the optical power supply system 1 and the optical power supply systems 1a to 1c in the embodiment
  • the first light source is the light source 11 in the embodiment
  • the second light source is the light source 12 in the embodiment.
  • the optical power feeding device is the optical power feeding section 3 and the optical power feeding sections 3b to 3c in the embodiment.
  • the first light source sends out a first optical signal for optical power supply to the first optical power supply line.
  • the first optical power supply line is the optical power supply line 51 in the embodiment.
  • the second light source sends out a second optical signal for optical power supply to a second optical power supply line, which is a line of a passive optical network.
  • the second optical power supply line is the optical power supply line 52 in the embodiment.
  • the optical power supply device includes a first photodiode, a second photodiode, and a power supply section.
  • the first photodiode is PD20-1 in the embodiment
  • the second photodiode is PD20-2 or PD20-2 to 20-N in the embodiment
  • the power supply unit is PD20-1 in the embodiment. -2 or PD20-N.
  • the first photodiode receives a first optical signal, converts the received first optical signal into an electrical signal, and obtains first electric power.
  • the second photodiode receives the second optical signal, converts the received second optical signal into an electrical signal, and obtains second power.
  • the power supply unit outputs power that is a combination of the first power and the second power to the power supply target device
  • the power feeding unit outputs the first power from the first photodiode to the second photodiode, and outputs the first power from the first photodiode to the second photodiode.
  • the combined power of the second photodiode and the second power may be outputted from the second photodiode to the power supply target device.
  • first photodiode and the second photodiode are connected in parallel, and the power supply unit outputs the first power from the first photodiode to the power supply target device, and outputs the second power to the second power supply device.
  • the photodiode may output power to the device to be powered.
  • the first optical power feeding line may be a line with a single star configuration.
  • the second optical signal may be a communication optical signal transmitted in a passive optical network.
  • the second optical signal may be an optical signal in which an optical power supply optical signal is added to a communication optical signal transmitted in a passive optical network.
  • the data amount of the second optical signal may be determined based on the line availability of the passive optical network.
  • Part of the configuration of the optical power supply system 1 and the optical power supply systems 1a to 1c in the embodiments described above may be realized by a computer.
  • a program for realizing this function may be recorded on a computer-readable recording medium, and the program recorded on the recording medium may be read into a computer system and executed.
  • the "computer system” herein includes hardware such as an OS and peripheral devices.
  • the term "computer-readable recording medium” refers to portable media such as flexible disks, magneto-optical disks, ROMs, and CD-ROMs, and storage devices such as hard disks built into computer systems.
  • a "computer-readable recording medium” refers to a storage medium that dynamically stores a program for a short period of time, such as a communication line when transmitting a program via a network such as the Internet or a communication line such as a telephone line. It may also include a device that retains a program for a certain period of time, such as a volatile memory inside a computer system that is a server or client in that case. Further, the above-mentioned program may be one for realizing a part of the above-mentioned functions, or may be one that can realize the above-mentioned functions in combination with a program already recorded in the computer system. It may be realized using a programmable logic device such as an FPGA (Field Programmable Gate Array).
  • FPGA Field Programmable Gate Array
  • Optical power supply system 1, 1a to 1c... Optical power supply system, 2, 2b, 2c... Optical power supply unit, 11, 12... Light source, 20-1 to 20-N... PD, 51, 52... Optical power supply line

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PCT/JP2022/034187 2022-09-13 2022-09-13 光給電方法、光給電システム及び光給電装置 Ceased WO2024057393A1 (ja)

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JP2008311916A (ja) * 2007-06-14 2008-12-25 Nec Corp 加入者側終端装置および加入者側給電方法
US20090016715A1 (en) * 2007-07-11 2009-01-15 James Furey Power over optical fiber system
JP2017098643A (ja) * 2015-11-19 2017-06-01 株式会社日立製作所 光給電システム及び光給電装置及び光給電方法
WO2022130483A1 (ja) * 2020-12-15 2022-06-23 日本電信電話株式会社 光給電システム、光給電方法及び受電光通信装置

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JP2008311916A (ja) * 2007-06-14 2008-12-25 Nec Corp 加入者側終端装置および加入者側給電方法
US20090016715A1 (en) * 2007-07-11 2009-01-15 James Furey Power over optical fiber system
JP2017098643A (ja) * 2015-11-19 2017-06-01 株式会社日立製作所 光給電システム及び光給電装置及び光給電方法
WO2022130483A1 (ja) * 2020-12-15 2022-06-23 日本電信電話株式会社 光給電システム、光給電方法及び受電光通信装置

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