WO2024261854A1 - 光給電システム、光クロージャ及び光給電方法 - Google Patents

光給電システム、光クロージャ及び光給電方法 Download PDF

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Publication number
WO2024261854A1
WO2024261854A1 PCT/JP2023/022752 JP2023022752W WO2024261854A1 WO 2024261854 A1 WO2024261854 A1 WO 2024261854A1 JP 2023022752 W JP2023022752 W JP 2023022752W WO 2024261854 A1 WO2024261854 A1 WO 2024261854A1
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WIPO (PCT)
Prior art keywords
optical
power supply
splitter
supply system
light source
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Ceased
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PCT/JP2023/022752
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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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Priority to JP2025527257A priority Critical patent/JPWO2024261854A1/ja
Priority to PCT/JP2023/022752 priority patent/WO2024261854A1/ja
Publication of WO2024261854A1 publication Critical patent/WO2024261854A1/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 system, an optical closure, and an optical power supply method.
  • PON Passive Optical Network
  • PON does not perform optical-electrical conversion, but instead uses an optical splitter, a low-cost passive element, to split the optical signal into multiple signals, allowing multiple users to share a single optical fiber, creating an economical network.
  • the optical splitter is installed inside an optical closure, for example, at the top of a utility pole near a user's home where an ONU (Optical Network Unit) is installed.
  • ONU Optical Network Unit
  • an optical coupler with multiple input terminals and multiple output terminals is used as the optical splitter.
  • sensing data such as various environmental information
  • IoT Internet of Things
  • PON networks are generally made up of a large number of passive elements. Therefore, when attempting to install a sensor inside or near an optical closure, there is the issue that it is difficult to secure sufficient power from the PON network to operate the sensor.
  • the present invention was made in consideration of the above technical background, and aims to provide a technology that can obtain power to operate a sensor from a PON network.
  • One aspect of the present invention is an optical power supply system comprising: a bidirectional optical splitter with multiple inputs and multiple outputs; a return section that converts the upstream and downstream directions of an optical signal output from the optical splitter and re-inputs the optical signal into the optical splitter; and a photodiode that receives a first optical signal sent from a first light source and transmitted through the optical splitter and a second optical signal sent from a second light source, output to the return section through the optical splitter, and transmitted again through the optical splitter after being directionally converted, and converts the first optical signal and the second optical signal into electrical signals, and the return section comprises an optical circulator that outputs the optical signal input to one port from the other port.
  • an optical closure comprising: a bidirectional optical splitter with multiple inputs and multiple outputs; a return section that converts the upstream and downstream directions of an optical signal output from the optical splitter and re-inputs the optical signal into the optical splitter; and a photodiode that receives a first optical signal sent from a first light source and transmitted through the optical splitter, and a second optical signal sent from a second light source, output to the return section through the optical splitter, direction-converted, and then transmitted again through the optical splitter, and converts the first optical signal and the second optical signal into electrical signals.
  • An aspect of the present invention is an optical power supply method including the steps of: sending a first optical signal from a first light source; transmitting the first optical signal to a photodiode via a bidirectional optical splitter with multiple inputs and multiple outputs; receiving the first optical signal and converting it into an electrical signal; sending a second optical signal from a second light source; outputting the second optical signal to a folding unit via the optical splitter; converting the upstream and downstream directions of the second optical signal output from the optical splitter by the folding unit having an optical circulator that outputs the optical signal input to one port from the other port; transmitting the second optical signal whose direction has been converted to the photodiode via the optical splitter; and receiving the second optical signal and converting it into an electrical signal.
  • the present invention makes it possible to obtain power to operate the sensor from the PON network.
  • FIG. 1 is a diagram illustrating a configuration of a conventional PON system.
  • 1 is an overall configuration diagram of an optical power supply system 1 according to a first embodiment of the present invention.
  • 4 is a flowchart showing an operation of the optical power supply system 1 according to the first embodiment of the present invention.
  • FIG. 11 is an overall configuration diagram of an optical power supply system 1a according to a second embodiment of the present invention.
  • FIG. 11 is an overall configuration diagram of an optical power supply system 1b according to a third embodiment of the present invention.
  • 13 is a flowchart showing an operation of an optical power supply system 1b according to a third embodiment of the present invention.
  • FIG. 13 is an overall configuration diagram of an optical power supply system 1c according to a fourth embodiment of the present invention.
  • FIG. 11 is an overall configuration diagram of an optical power supply system 1a according to a second embodiment of the present invention.
  • FIG. 11 is an overall configuration diagram of an optical power supply system 1a according to a second embodiment of the present invention.
  • FIG. 13 is a diagram illustrating an example of the configuration of an optical circulator 60 according to a fourth embodiment.
  • FIG. 13 is a diagram for explaining a turnaround of a network route in a first modified example of the fourth embodiment of the present invention.
  • FIG. 13 is a diagram for explaining a turnaround of a network route in a second modified example of the fourth embodiment of the present invention.
  • optical power supply system optical closure, and optical power supply method of the embodiment will be described below with reference to the drawings.
  • PON system general PON
  • FIG. 1 is a diagram showing the configuration of a conventional PON system.
  • the conventional PON system includes a light source 12, an optical splitter 30, and an optical closure 2.
  • the PON system also includes a number of ONUs (not shown) installed in each user's premises, and optical fibers connecting the light source 12, the optical splitter 30, and the ONUs in each user's premises.
  • the light source 12 is installed in a building such as a station building.
  • the light source 12 is a light source for transmitting optical signals carrying communication data from the station building to the ONUs in multiple user homes.
  • a PON configuration is used as the network configuration between the light source 12 and the ONUs in each user home.
  • the optical signal sent from the light source 12 is split by an optical splitter 30 installed on the network path, and is received by the ONUs in each user home.
  • the optical splitter 30 is installed inside the optical closure 2.
  • the optical closure 2 is installed, for example, on top of a utility pole.
  • the optical splitter 30 splits the optical signal (downstream signal) sent from the light source 12 in the direction of multiple user homes.
  • the optical splitter 30 also merges the optical signals (upstream signals) sent from the ONUs in each user home in the direction of the station.
  • the optical splitter 30 is a multi-input, multi-output optical coupler with multiple terminals on both the station side and the user premises side.
  • the optical splitter 30 illustrated in FIG. 1 is a 4-to-4 input/output optical coupler with four terminals on both the station side and the user premises side.
  • optical signals in different wavelength regions are used for the upstream and downstream signals.
  • the PON system shown in FIG. 1 is configured to use optical signals in the wavelength region of 1260 to 1360 nm for the upstream signal and optical signals in the wavelength region of 1480 to 1580 nm for the downstream signal.
  • one of the four terminals on the station side of the optical splitter 30 is connected to the light source 12 in the station, while the remaining three terminals are unused terminals.
  • the unused terminals referred to here are unused terminals of the optical splitter 30 that are not connected to either the light source 12 or the ONU in the user's premises. Therefore, when considering obtaining power from the transmitted optical signal by optical power supply, the power that could be obtained from the optical signal output from the three unused terminals on the station side of the optical splitter 30 is wasted without being utilized.
  • FIG. 1 shows two user homes as an example.
  • two of the four terminals on the user home side of the optical splitter 30 are connected to the ONUs in each user home, while the remaining two terminals are unused terminals. Therefore, when considering obtaining power from the transmitted optical signal by optical power supply, the power that can be obtained from the optical signal output from the two unused terminals on the user home side of the optical splitter 30 is wasted without being utilized.
  • Fig. 2 is an overall configuration diagram of the optical power supply system 1 in the first embodiment of the present invention.
  • the optical power supply system 1 in the first embodiment is an optical power supply system that utilizes a conventional PON system.
  • the optical power supply system 1 further includes a sensor and a power supply unit that optically supplies power to the sensor in the optical closure 2.
  • the optical power supply system 1 includes a light source 12 and an optical closure 2.
  • the optical power supply system 1 also includes a plurality of ONUs (not shown) installed in each user's premises, and optical fibers connecting the light source 12, the optical splitter 30, and the ONUs in each user's premises.
  • three PDs (Photodiodes) 20 (PD20-1 to PD20-3), an optical splitter 30, and a sensor 40 are installed inside the optical closure 2.
  • the number of PDs 20 is not limited to three, and may be as many as the number of unused terminals on the user's premises side of the optical splitter 30.
  • Each PD 20, the optical splitter 30, and the sensor 40 are connected by an optical power supply line 52.
  • These PDs 20 and the optical splitter 30 function as a power supply unit that supplies power to the sensor 40.
  • an optical fiber is used for the optical power supply line 52.
  • the light source 12 is installed in a building such as a station building.
  • the light source 12 is a light source for transmitting optical signals carrying communication data from the station building to the ONUs in multiple user homes.
  • a PON configuration is used as the network configuration between the light source 12 and the ONUs in each user home.
  • the optical signal sent from the light source 12 is split by an optical splitter 30 installed on the network path, and is received by the ONUs in each user home.
  • the optical splitter 30 is installed inside the optical closure 2.
  • the optical closure 2 is installed, for example, on top of a utility pole.
  • the optical splitter 30 splits the optical signal (downstream signal) sent from the light source 12 in the direction of multiple user homes.
  • the optical splitter 30 also merges the optical signals (upstream signals) sent from the ONUs in each user home in the direction of the station.
  • the optical splitter 30 in this embodiment is a multi-input, multi-output optical coupler in which the number of terminals on the station side and the number of terminals on the user premises side are both multiple.
  • the optical splitter 30 illustrated in FIG. 2 is a 4-to-4 input/output optical coupler in which the number of terminals on the station side and the number of terminals on the user premises side are four each.
  • the upstream signal and the downstream signal use optical signals in different wavelength regions.
  • an optical signal in the wavelength region of 1260 to 1360 nm is used for the upstream signal
  • an optical signal in the wavelength region of 1480 to 1580 nm is used for the downstream signal.
  • one of the four terminals on the station side of the optical splitter 30 is connected to the station light source 12, while the remaining three terminals are unused terminals.
  • FIG. 2 also shows one user's home as an example.
  • one of the four terminals on the user's home side of the optical splitter 30 is connected to an ONU (not shown) in the user's home, and the remaining three terminals are connected to PD20-1 to PD20-3, respectively. Therefore, the optical signal sent out by the light source 12 is also received by PD20-1 to PD20-3, respectively.
  • PD20-1 to PD20-3 each obtain power by converting the received optical signal into an electrical signal.
  • PD20-1 to PD20-3 each supply the obtained power to sensor 40.
  • the first embodiment assumes a case in which at least one of the multiple network paths branched by the optical splitter 30 is not used to transmit communication data to a user's home and is terminated unused.
  • the first embodiment aims to utilize an unused network path in the PON for optical power supply to a sensor 40 installed inside the optical closure 2.
  • PD20-1 to PD20-3 obtain power by receiving an optical signal carrying communication data transmitted from a PON station to a user's home.
  • PD20-1 to PD20-3 are connected in series.
  • the power obtained by PD20-1 is output to PD20-2.
  • the power output from PD20-1 and the power obtained by PD20-2 are combined and output to PD20-3.
  • the power output from PD20-2 and the power obtained by PD20-3 are combined and output to sensor 40.
  • the order in which PD20-1 to PD20-3 are connected in series is not limited to this, and may be the opposite of the order shown in FIG. 2, for example.
  • the sensor 40 is powered by power supplied from the PD 20-3.
  • the sensor 40 is, for example, a sensor that senses environmental information, etc.
  • the sensor 40 generates sensing data for, for example, monitoring the status of devices installed inside or near the optical closure 2, or monitoring the weather around the optical closure 2, etc.
  • the sensor 40 is, for example, an IoT device, and can wirelessly connect to a network and transmit sensing data to an external server, etc.
  • the optical signal carrying the communication data transmitted from the PON station to the user's home may be the optical signal for data communication itself, or it may be an optical signal for data communication to which an additional signal for optical power supply has been added. In this case, it becomes possible to supply a larger amount of power.
  • the optical power supply system 1 in the first embodiment supplies optical power to the sensor 40 via a network path that passes through an optical power supply line 52 connected to one or more unused terminals on the user's premises side of the optical splitter 30, out of multiple network paths in a PON configuration that transmits optical signals sent from the light source 12.
  • FIG. 3 is a flowchart showing the operation of the optical power supply system 1 in the first embodiment of the present invention. Note that, as an example, a case where the optical splitter 30 has two unused terminals on the user premises side will be described here.
  • the light source 12 sends an optical signal, which is an existing signal for data communication, to the PON (step S001).
  • the optical splitter 30 of the PON splits the optical signal sent from the light source 12 and transmits the optical signals from all (here, two) unused terminals on the user premises to PD20-1 and PD20-2 via the optical power supply line 52 (step 002).
  • PD20-1 (first PD) receives an optical signal transmitted via optical power supply line 52, which is one of the network paths branched by optical splitter 30 of the PON (step S003).
  • PD20-1 (first PD) converts the received optical signal into an electrical signal and outputs the resulting power to PD20-2 (second PD) (step S004).
  • PD20-2 (second PD) receives an optical signal transmitted via optical power supply line 52, which is one of the other network paths branched off by optical splitter 30 of the PON (step S005).
  • PD20-2 (second PD) converts the received optical signal into an electrical signal, and supplies the resulting power to sensor 40 together with the power input from PD20-1 (first PD) (step S006). This completes the operation of optical power supply system 1 shown in the flowchart of FIG. 3.
  • the optical power supply system 1 in the first embodiment can obtain power from an optical signal for data communication transmitted from the light source 12 by the PON.
  • the optical power supply system 1 in the first embodiment optically supplies power to the sensor 40 via a network path that passes through the optical power supply line 52 connected to an unused terminal on the user's premises side of the optical splitter 30, out of multiple network paths in the PON configuration that transmit the optical signal sent from the light source 12.
  • optical power supply system 1 of the first embodiment if there are multiple unused network paths among the multiple network paths branched by the PON optical splitter 30, a PD 20 is prepared to connect to each of these multiple unused network paths.
  • optical power is supplied to the PDs 20 connected to the unused terminals on the user's premises side of the PON optical splitter 30. In this way, the optical power supply system 1 can obtain power via multiple network paths, which allows the sensor 40 to obtain greater power.
  • the optical power supply system 1 in the first embodiment can secure sufficient power from the PON network to operate the sensor 40 installed, for example, inside or near the optical closure 2 in a PON network where it is generally difficult to secure power because the PON network is composed of a large number of passive elements.
  • the optical power supply system 1 in the first embodiment there is no need to increase the amount of light from the existing light source 12 in order to increase the amount of power supplied, so there is no risk of heating the optical fiber. Therefore, the optical power supply system 1 in the first embodiment can increase the amount of power supplied in optical power supply without compromising safety.
  • the optical power supply system 1 in the first embodiment it is possible to utilize the existing light source 12 and the existing optical splitter 30 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 and connect the unused terminal on the user's premises side of the optical splitter 30 to the PD 20 with the optical power supply line 52.
  • the optical power supply system 1 in the first embodiment can be constructed without significantly modifying an existing system, so installation costs can be kept low. Furthermore, the optical power supply system 1 in the first embodiment can effectively utilize wasted optical signals flowing through unused network paths in a PON for optical power supply.
  • the optical power supply system 1 in the first embodiment shown in FIG. 2 for example, all unused terminals on the user premises side of the optical splitter 30 are connected to the PD 20. However, it may be configured such that only some of the unused terminals on the user premises side of the optical splitter 30 are connected to the PD 20. In this case, the obtained power is smaller than that of the optical power supply system 1 described above in which all unused terminals are used for optical power supply, but the cost of laying optical fiber can be reduced.
  • the optical power supply system 1 in the first embodiment described above is configured to utilize the unused terminals on the user premises side of the optical splitter 30 for optical power supply, but the unused terminals on the central office side are left unused. Therefore, in the optical power supply system 1 in the first embodiment, when considering obtaining power from the optical signals sent from the ONUs in each user premises, the power that can be obtained from the optical signals output from the three unused terminals on the central office side of the optical splitter 30 is wasted without being used.
  • the optical power supply system 1a in the second embodiment described below is configured to obtain power not only from optical signals transmitted through one or more unused terminals on the user premises side of the PON optical splitter 30, but also from optical signals transmitted through one or more unused terminals on the central office side of the optical splitter 30.
  • Fig. 4 is an overall configuration diagram of the optical power supply system 1a in the second embodiment of the present invention.
  • the optical power supply system 1a includes a light source 12 and an optical closure 2.
  • the optical power supply system 1a also includes a plurality of ONUs (not shown) installed in each user's home, and optical fibers connecting the light source 12, an optical splitter, and each ONU.
  • PDs 20 (PD20-1 to PD20-6), an optical splitter 30, and a sensor 40 are installed inside the optical closure 2.
  • the number of PDs 20 is not limited to six, and may be, for example, the same as the number of unused terminals on the user premises side and the central office side of the optical splitter 30.
  • Each PD 20, the optical splitter 30, and the sensor 40 are connected by an optical power supply line 52.
  • These PDs 20 and optical splitter 30 function as a power supply unit.
  • an optical fiber is used for the optical power supply line 52.
  • the light source 12 is installed in a building such as a station building.
  • the light source 12 is a light source for transmitting optical signals carrying communication data from the station building to the ONUs in multiple user homes.
  • a PON configuration is used as the network configuration between the light source 12 and the ONUs in each user home.
  • the optical signal sent from the light source 12 is split by an optical splitter 30 installed on the network path, and is received by the ONUs in each user home.
  • the optical splitter 30 is installed inside the optical closure 2.
  • the optical closure 2 is installed, for example, on top of a utility pole.
  • the optical splitter 30 splits the optical signal (downstream signal) sent from the light source 12 in the direction of multiple user homes.
  • the optical splitter 30 also merges the optical signals (upstream signals) sent from the ONUs in each user home in the direction of the station.
  • the optical splitter 30 is a multi-input, multi-output optical coupler with multiple terminals on both the station side and the user premises side.
  • the optical splitter 30 illustrated in FIG. 4 is a 4-to-4 input/output optical coupler with four terminals on the station side and four terminals on the user premises side.
  • optical signals in different wavelength regions are used for the upstream and downstream signals.
  • optical signals in the wavelength region of 1260 to 1360 nm are used for the upstream signals
  • optical signals in the wavelength region of 1480 to 1580 nm are used for the downstream signals.
  • FIG. 4 illustrates one user's home as an example. Therefore, the optical signal sent by the ONU in the user's home is also received by PD20-1 to PD20-3, respectively. Each of PD20-1 to PD20-3 obtains power by converting the received optical signal into an electrical signal.
  • one of the four terminals on the user premises side of the optical splitter 30 is connected to an ONU (not shown) in the user premises, and the remaining three terminals are connected to PD20-4 to PD20-6, respectively. Therefore, the optical signal sent out by the light source 12 is also received by PD20-4 to PD20-6, respectively.
  • Each of PD20-4 to PD20-6 obtains power by converting the received optical signal into an electrical signal.
  • the second embodiment assumes a case in which at least one of the multiple network paths branched by the optical splitter 30 is not used for transmitting communication data to a user's home or to the station, and is terminated unused.
  • the second embodiment aims to utilize an unused network path in a PON for optical power supply to a sensor 40 installed inside or near the optical closure 2.
  • PD20-1 to PD20-3 obtain power by receiving optical signals carrying communication data transmitted from the ONU in the user's premises to the PON station.
  • PD20-4 to PD20-5 obtain power by receiving optical signals carrying communication data transmitted from the PON station to the user's premises.
  • PD20-1 to PD20-6 are connected in series. As shown in FIG. 4, the power obtained in sequence from PD20-1 to PD20-6 is combined and output to the sensor 40. Note that the order in which PD20-1 to PD20-6 are connected in series is not limited to this, and may be the opposite of the order shown in FIG. 4, for example.
  • the optical power supply system 1a in the second embodiment not only the power obtained from the unused terminal on the user's premises side of the optical splitter 30, but also the power obtained from the unused terminal on the station side is supplied to the sensor 40. Therefore, the optical power supply system 1a in the second embodiment can supply more power to the sensor 40 than the optical power supply system 1 in the first embodiment described above.
  • Sensor 40 is powered by power supplied from PD20-6.
  • Sensor 40 is, for example, a sensor that senses environmental information, etc.
  • Sensor 40 generates sensing data for, for example, monitoring the status of devices installed inside or near optical closure 2, or monitoring the weather around optical closure 2.
  • Sensor 40 is, for example, an IoT device, and can wirelessly connect to a network and transmit sensing data to an external server, etc.
  • the optical signal carrying the communication data transmitted from the PON station to the user's home may be the optical signal for data communication itself, or it may be an optical signal for data communication to which an additional signal for optical power supply has been added. In this case, it becomes possible to supply a larger amount of power.
  • the optical power supply system 1a in the second embodiment supplies optical power to the sensor 40 via a network path that passes through the optical power supply line 52 connected to one or more unused terminals on the station side and the user premises side of the optical splitter 30, among multiple network paths in a PON configuration that transmits optical signals sent from the light source 12.
  • the optical power supply system 1a in the second embodiment can obtain power from optical signals for data communication transmitted by PON from the light source 12 and the ONUs (not shown) in each user's home.
  • the optical power supply system 1a in the second embodiment supplies optical power to the sensor 40 via a network path that passes through the optical power supply line 52 connected to an unused terminal of the optical splitter 30, among multiple network paths in a PON configuration that transmits optical signals sent from the light source 12 and the ONUs in each user's home.
  • the optical power supply system 1a in the second embodiment when there are multiple unused network paths among the multiple network paths branched by the PON optical splitter 30, a PD 20 is prepared to connect to each of these multiple unused network paths.
  • optical power is supplied to the PDs 20 connected to the unused terminals on the station side and the user premises side of the PON optical splitter 30. In this way, the optical power supply system 1a can obtain power via multiple network paths, which allows the sensor 40 to obtain greater power.
  • the optical power supply system 1a in the second embodiment can secure sufficient power from the PON network to operate the sensor 40 installed, for example, inside or near the optical closure 2 in a PON network where it is generally difficult to secure power because the PON network is composed of a large number of passive elements.
  • the optical power supply system 1a in the second embodiment there is no need to increase the amount of light from the existing light source 12 in order to increase the amount of power supplied, so there is no risk of heating the optical fiber. Therefore, the optical power supply system 1a in the second embodiment can increase the amount of power supplied in optical power supply without compromising safety.
  • the optical power supply system 1a in the second embodiment it is possible to utilize the existing light source 12 and the existing optical splitter 30 of the PON system. Therefore, in the optical power supply system 1a in the second embodiment, it is only necessary to newly install the PD 20 and connect the unused terminals on the station side and the user premises side of the optical splitter 30 to the PD 20 with the optical power supply line 52.
  • 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. Furthermore, the optical power supply system 1a in the second embodiment can effectively utilize wasted optical signals flowing through unused network paths in a PON for optical power supply.
  • optical power supply system 1a in the second embodiment shown in FIG. 4 for example, all unused terminals on the station side and the user premises side of the optical splitter 30 are connected to the PD 20.
  • it may be configured such that only some of the unused terminals of the multiple unused terminals on the station side and the user premises side of the optical splitter 30 are connected to the PD 20.
  • the obtained power is smaller than that of the optical power supply system 1a described above in which all unused terminals are used for optical power supply, but the cost of laying optical fiber can be reduced.
  • optical power supply system 1b in the third embodiment described below is configured to utilize both an unused terminal on the user premises side of the optical splitter 30 and an unused terminal on the central office side for optical power supply.
  • FIG. 5 is an overall configuration diagram of an optical power supply system 1b in a third embodiment of the present invention.
  • the optical power supply system 1b includes a light source 12 and an optical closure 2.
  • the optical power supply system 1b also includes a plurality of ONUs (not shown) installed in each user's premises, and optical fibers connecting the light source 12, the optical splitter 30, and each ONU.
  • PDs 20 (PD20-1 to PD20-5), an optical splitter 30, and a sensor 40 are installed inside the optical closure 2.
  • the number of PDs 20 is not limited to five, and may be, for example, the same as the number of unused terminals on the central office side and the user home side of the optical splitter 30.
  • Each PD 20, the optical splitter 30, and the sensor 40 are connected by an optical power supply line 52.
  • These PDs 20 and optical splitter 30 function as a power supply unit.
  • an optical fiber is used for the optical power supply line 52.
  • the light source 12 is installed in a building such as a station building.
  • the light source 12 is a light source for transmitting optical signals carrying communication data from the station building to the ONUs in multiple user homes.
  • a PON configuration is used as the network configuration between the light source 12 and the ONUs in each user home.
  • the optical signal sent from the light source 12 is split by an optical splitter 30 installed on the network path, and is received by the ONUs in each user home.
  • the optical splitter 30 is installed inside the optical closure 2.
  • the optical closure 2 is installed, for example, on top of a utility pole.
  • the optical splitter 30 splits the optical signal (downstream signal) sent from the light source 12 in the direction of multiple user homes.
  • the optical splitter 30 also merges the optical signals (upstream signals) sent from the ONUs in each user home in the direction of the station.
  • the optical splitter 30 is a multi-input, multi-output optical coupler with multiple terminals on both the station side and the user premises side.
  • the optical splitter 30 illustrated in FIG. 5 is a 4-to-4 input/output optical coupler with four terminals on the station side and four terminals on the user premises side.
  • optical signals in different wavelength regions are used for the upstream and downstream signals.
  • optical signals in the wavelength region of 1260 to 1360 nm are used for the upstream signals
  • optical signals in the wavelength region of 1480 to 1580 nm are used for the downstream signals.
  • FIG. 5 also illustrates two user homes as an example. Optical signals sent by ONUs (not shown) in each user home are also received by PD20-1 to PD20-3, respectively. Each of PD20-1 to PD20-3 obtains power by converting the received optical signal into an electrical signal.
  • the optical power supply system 1b illustrated in FIG. 5 of the four terminals on the user premises side of the optical splitter 30, two terminals are connected to the ONUs in each user premises (here, in two user premises), and the remaining two terminals are connected to PD20-4 to PD20-5, respectively. Therefore, the optical signal sent out by the light source 12 is also received by PD20-4 to PD20-5, respectively. Each of PD20-4 to PD20-5 obtains power by converting the received optical signal into an electrical signal.
  • the third embodiment assumes a case in which at least one of the multiple network paths branched by the optical splitter 30 is not used to transmit communication data to the user's home and the station, and is terminated unused.
  • the third embodiment aims to utilize unused network paths in the PON for optical power supply to the sensor 40 installed inside the optical closure 2.
  • PD20-1 to PD20-3 obtain power by receiving optical signals carrying communication data transmitted from the ONUs in each user's home to the PON station.
  • PD20-4 to PD20-5 obtain power by receiving optical signals carrying communication data transmitted from the PON station to the user's home.
  • PD20-1 to PD20-5 are connected in parallel. Therefore, as shown in FIG. 5, the power obtained by PD20-1 to PD20-5 is output in parallel to the sensor 40.
  • PD20-1 to PD20-5 are connected in parallel, so the current can be increased more than when PD20-1 to PD20-5 are connected in series.
  • multiple PDs 20 are connected in series, so the voltage can be increased more than when multiple PDs 20 are connected in parallel as in this embodiment.
  • Sensor 40 is driven by power supplied in parallel from each of PD20-1 to PD20-5.
  • Sensor 40 is, for example, a sensor that senses environmental information, etc.
  • Sensor 40 generates sensing data for, for example, monitoring the status of devices installed inside or near optical closure 2, or monitoring the weather around optical closure 2.
  • Sensor 40 is, for example, an IoT device, and can wirelessly connect to a network and transmit sensing data to an external server, etc.
  • the optical signal carrying the communication data transmitted from the PON station to the user's home may be the optical signal for data communication itself, or it may be an optical signal for data communication to which an additional signal for optical power supply has been added. In this case, it becomes possible to supply a larger amount of power.
  • the optical power supply system 1b in the third embodiment supplies optical power to the sensor 40 via a network path that passes through the optical power supply line 52 connected to one or more unused terminals of the optical splitter 30, among multiple network paths in a PON configuration that transmits optical signals sent from the light source 12.
  • FIG. 6 is a flowchart showing the operation of the optical power supply system 1b in the third embodiment of the present invention. Note that, as an example, it is assumed here that the optical splitter 30 has two unused terminals (for example, one unused terminal on the station side and one unused terminal on the user premises side).
  • the light source 12 sends an optical signal, which is an existing signal for data communication, to the PON (step S101).
  • the optical splitter 30 of the PON splits the optical signal sent from the light source 12 and transmits the optical signal from an unused terminal on the user's premises to the PD 20-1 via the optical power supply line 52 (step 102).
  • PD20-1 (first PD) receives an optical signal transmitted by the optical power supply line 52, which is one of the network paths branched by the optical splitter of the PON (step S103).
  • PD20-1 (first PD) converts the received optical signal into an electrical signal and supplies the resulting power to the sensor 40 (step S104).
  • the ONU in the user's premises sends an optical signal, which is an existing signal for data communication, to the PON (step S105).
  • the optical splitter 30 of the PON splits the optical signal sent from the ONU and transmits the optical signal from an unused terminal on the central office side to PD 20-2 via the optical power supply line 52 (step 106).
  • PD20-2 (second PD) receives an optical signal transmitted by optical power supply line 52, which is one of the network paths branched by the optical splitter of the PON (step S107).
  • PD20-2 (second PD) converts the received optical signal into an electrical signal and supplies the resulting power to sensor 40 (step S108). This completes the operation of optical power supply system 1b shown in the flowchart of FIG. 6.
  • the optical power supply system 1b in the third embodiment can obtain power from optical signals for data communication transmitted by PON from the light source 12 and the ONUs in each user's home.
  • the optical power supply system 1b in the third embodiment supplies optical power to the sensor 40 via a network path that passes through the optical power supply line 52 connected to an unused terminal of the optical splitter 30, among multiple network paths in a PON configuration that transmits optical signals sent from the light source 12 and the ONUs in each user's home.
  • optical power supply system 1b in the third embodiment when there are a plurality of unused network paths among the plurality of network paths branched by the optical splitter 30 of the PON, a PD 20 is prepared to connect to each of the plurality of unused network paths.
  • optical power is supplied to the PD 20 connected to the unused terminals on the station side and the user premises side of the optical splitter 30 of the PON.
  • the optical power supply system 1b in the third embodiment can secure sufficient power from the PON network to operate the sensor 40 installed, for example, inside or near the optical closure 2 in a PON network where it is generally difficult to secure power because the PON network is composed of a large number of passive elements.
  • the optical power supply system 1b in the third embodiment since there is no need to increase the light intensity of the existing light source 12 in order to increase the amount of power supply, there is no risk of heating the optical fiber. Therefore, the optical power supply system 1b in the third embodiment can increase the amount of power supply in optical power supply without compromising safety.
  • the optical power supply system 1b in the third embodiment it is possible to utilize the existing light source 12 and the existing optical splitter 30 of the PON system. Therefore, in the optical power supply system 1b in the third embodiment, it is only necessary to newly install the PD 20 and connect the unused terminals on the station side and the user premises side of the optical splitter 30 to the PD 20 with the optical power supply line 52.
  • the optical power supply system 1b in the third embodiment can be constructed without significantly modifying an existing system, so installation costs can be kept low. Furthermore, the optical power supply system 1b in the third embodiment can effectively utilize wasted optical signals flowing through unused network paths in a PON for optical power supply.
  • optical power supply system 1b in the third embodiment all unused terminals on the central office side and the user premises side of the optical splitter 30 are connected to the PD 20.
  • it may be configured such that only some of the unused terminals of the optical splitter 30 on the central office side and the user premises side are connected to the PD 20.
  • the obtained power is smaller than that of the optical power supply system 1b described above in which all unused terminals are used for optical power supply, but the cost of laying optical fiber can be reduced.
  • FIG. 7 is a diagram showing the overall configuration of the optical power supply system 1c according to the fourth embodiment of the present invention.
  • the optical power supply system 1c according to the fourth embodiment is an optical power supply system that utilizes a conventional PON system.
  • the optical power supply system 1c includes a light source 12 and an optical closure 2.
  • the optical power supply system 1c also includes a plurality of ONUs (not shown) installed in each user's premises, and optical fibers connecting the light source 12, the optical splitter 30, and the ONUs in each user's premises.
  • two PDs 20 (PD20-1 and PD20-2), an optical splitter 30, a sensor 40, and an optical circulator 60 are installed in the optical closure 2.
  • the number of PDs 20 is not limited to two, and may be as many as the number of unused terminals on the user premises side and the central office side of the optical splitter 30.
  • Each PD 20, the optical splitter 30, the sensor 40, and the optical circulator 60 are connected by an optical power supply line 52.
  • These PDs 20 and the optical splitter 30 function as a power supply unit that supplies power to the sensor 40.
  • an optical fiber is used for the optical power supply line 52.
  • the light source 12 is installed in a building such as a station building.
  • the light source 12 is a light source for transmitting optical signals carrying communication data from the station building to the ONUs in multiple user homes.
  • a PON configuration is used as the network configuration between the light source 12 and the ONUs in each user home.
  • the optical signal sent from the light source 12 is split by an optical splitter 30 installed on the network path, and is received by the ONUs in each user home.
  • the optical splitter 30 is installed inside the optical closure 2.
  • the optical closure 2 is installed, for example, on top of a utility pole.
  • the optical splitter 30 splits the optical signal (downstream signal) sent from the light source 12 in the direction of multiple user homes.
  • the optical splitter 30 also merges the optical signals (upstream signals) sent from the ONUs in each user home in the direction of the station.
  • the optical splitter 30 in this embodiment is a multi-input, multi-output optical coupler in which the number of terminals on the station side and the number of terminals on the user premises side are both multiple.
  • the optical splitter 30 illustrated in FIG. 7 is a 4-to-4 input/output optical coupler in which the number of terminals on the station side and the number of terminals on the user premises side are four each.
  • optical signals in different wavelength regions are used for the upstream signal and the downstream signal.
  • an optical signal in the wavelength region of 1260 to 1360 [nm] is used for the upstream signal
  • an optical signal in the wavelength region of 1480 to 1580 [nm] is used for the downstream signal.
  • one of the four terminals on the station side of the optical splitter 30 is connected to the light source 12 in the station, while the remaining three terminals are connected to an optical circulator 60.
  • the optical circulator 60 shown in FIG. 7 is a device that converts the direction of an upstream signal sent from an ONU in each user's premises into a downstream signal.
  • FIG. 8 is a diagram showing an example of the configuration of an optical circulator 60 in the fourth embodiment.
  • the optical circulator shown in FIG. 8 is an element designed so that an optical signal input from one port is output from the adjacent port. As shown in FIG. 8, an optical signal input from Port 1 is output from Port 2, an optical signal input from Port 2 is output from Port 3, and an optical signal input from Port 3 is output from Port 1.
  • an optical circulator 60 it becomes possible to convert an upstream signal into a downstream signal.
  • Figure 7 shows two user homes as an example.
  • two of the four terminals on the user home side of the optical splitter 30 are connected to an ONU (not shown) in each user home, and the remaining two terminals are connected to PD20-1 and PD20-2, respectively.
  • the optical signal sent by the ONU in each user's premises is not only transmitted to the central office, but also redirected by the optical circulator 60 to a downstream signal, which is then received by PD20-1 and PD20-2.
  • the optical signal redirected to become a downstream signal is also transmitted to the ONU in the user's premises, which is the source of the signal, but a filter that cuts out optical signals in the wavelength range of the upstream signal (1260-1360 [nm]) can be installed on the user's premises.
  • the optical signal sent by the light source 12 is also received by PD20-1 and PD20-2.
  • PD20-1 and PD20-2 obtain power by converting the received optical signal into an electrical signal.
  • PD20-1 and PD20-2 supply the power obtained by optical power supply to the sensor 40.
  • the fourth embodiment assumes a case in which at least one of the multiple network paths branched by the optical splitter 30 is not used for transmitting communication data to the user's home or the station, and is terminated unused.
  • the fourth embodiment aims to utilize an unused network path in the PON for optical power supply to a sensor 40 installed inside the optical closure 2.
  • PD20-1 and PD20-2 obtain power by receiving optical signals carrying communication data transmitted from a PON station to a user's home.
  • PD20-1 and PD20-2 also obtain power by receiving optical signals carrying communication data sent from an ONU in each user's home toward the station side, which are converted into downstream signals by an optical circulator 60 and transmitted.
  • PD20-1 and PD20-2 are connected in series. As shown in FIG. 7, the power obtained by PD20-1 is output to PD20-2. The power output from PD20-1 and the power obtained by PD20-2 are combined and output to the sensor 40. Note that the order in which PD20-1 and PD20-2 are connected in series is not limited to this, and may be reversed from the order shown in FIG. 2, for example.
  • the sensor 40 is powered by power supplied from the PD 20-2.
  • the sensor 40 is, for example, a sensor that senses environmental information, etc.
  • the sensor 40 generates sensing data for, for example, monitoring the status of devices installed inside or near the optical closure 2, or monitoring the weather around the optical closure 2.
  • the sensor 40 is, for example, an IoT device, and can wirelessly connect to a network and transmit sensing data to an external server, etc.
  • the optical signal carrying the communication data transmitted from the PON station to the user's home may be the optical signal for data communication itself, or it may be an optical signal for data communication to which an additional signal for optical power supply has been added. In this case, it becomes possible to supply a larger amount of power.
  • the optical power supply system 1c in the fourth embodiment supplies optical power to the sensor 40 via a network path that passes through an optical power supply line 52 connected to one or more unused terminals on the user's premises side of the optical splitter 30, among multiple network paths in a PON configuration that transmits optical signals sent from the light source 12.
  • the optical power supply system 1c also supplies optical power to the sensor 40 via a network path that passes through an optical power supply line 52 connected to one or more unused terminals on the station side of the optical splitter 30, among multiple network paths in a PON configuration that transmit optical signals sent from the ONUs in each user's premises.
  • the upstream signal output from the unused terminal on the station side is redirected by the optical circulator 60 to a downstream signal, and is then input again to another unused terminal on the station side of the optical splitter 30.
  • the optical power supply system 1 in the first embodiment is the configuration that can obtain the highest voltage.
  • the optical power supply system 1a in the second embodiment requires the use of a large number of PDs 20.
  • the PDs 20 are connected in series, so if even one PD 20 fails, the sensor 40 will not be able to obtain power.
  • the optical power supply system 1c in the fourth embodiment has a configuration in which an optical circulator 60 is connected to an unused terminal on the station side of the optical splitter 30, making it possible to convert upstream signals into downstream signals and reducing the number of PDs 20 required. Furthermore, by having such a configuration, the optical power supply system 1c in the fourth embodiment can prevent the power supplied to the sensor 40 from becoming zero, as long as the PD 20 on the user's premises is normal, even if the optical circulator 60 breaks down.
  • the optical circulator 60 is connected only to the unused terminal on the central office side of the optical splitter 30, but the optical circulator 60 may be connected only to the unused terminal on the user's premises side of the optical splitter 30. Alternatively, the optical circulator 60 may be connected to both the unused terminal on the central office side of the optical splitter 30 and the unused terminal on the user's premises side.
  • a Fabry-Perot laser which is generally known to have low interference, may be used as the light source 12 (first light source) in the central office and/or the light source (second light source) in the ONU in each user's home.
  • the optical power supply system 1c in the fourth embodiment can obtain power from an optical signal for data communication transmitted from the light source 12 via a PON.
  • the optical power supply system 1c in the fourth embodiment supplies optical power to the sensor 40 via a network path that passes through the optical power supply line 52 connected to an unused terminal on the user's premises side of the optical splitter 30, out of multiple network paths in the PON configuration that transmit the optical signal sent from the light source 12.
  • optical power supply system 1c in the fourth embodiment when there are a plurality of unused network paths among the plurality of network paths branched by the optical splitter 30 of the PON, a PD 20 is prepared to connect to each of the plurality of unused network paths.
  • optical power is supplied to the PDs 20 connected to the unused terminals on the user premises side of the optical splitter 30 of the PON.
  • an optical circulator 60 is connected to an unused terminal on the station side of the optical splitter 30 of the PON, and optical power is supplied to the PDs 20 connected to unused terminals on the user premises side of the optical splitter 30 using optical signals in which upstream signals are redirected to downstream signals.
  • the optical power supply system 1c can obtain power via multiple network paths, allowing the sensor 40 to obtain a larger amount of power.
  • the optical power supply system 1c in the fourth embodiment can secure sufficient power from the PON network to operate the sensor 40 installed, for example, inside or near the optical closure 2 in a PON network where it is generally difficult to secure power because the PON network is composed of a large number of passive elements.
  • the optical power supply system 1c in the fourth embodiment since there is no need to increase the amount of light from the existing light source 12 in order to increase the amount of power supplied, there is no risk of heating the optical fiber. Therefore, the optical power supply system 1c in the fourth embodiment can increase the amount of power supplied in optical power supply without compromising safety.
  • the existing light source 12 and the existing optical splitter 30 of the PON system can be utilized. Therefore, in the optical power supply system 1c in the fourth embodiment, it is only necessary to newly install the PD 20 and the optical circulator 60, connect the unused terminal on the user's premises side of the optical splitter 30 to the PD 20 with the optical power supply line 52, and also connect the unused terminal on the central office side of the optical splitter 30 to the optical circulator 60 with the optical power supply line 52.
  • the optical power supply system 1c in the fourth embodiment can be constructed without significantly modifying an existing system, so installation costs can be kept low. Furthermore, the optical power supply system 1 in the fourth embodiment can effectively utilize wasted optical signals flowing through unused network paths in a PON for optical power supply.
  • optical power supply system 1c in the fourth embodiment shown in FIG. 7 for example, all unused terminals on the user premises side of the optical splitter 30 are connected to the PD 20. However, it may be configured such that only some of the unused terminals on the user premises side of the optical splitter 30 are connected to the PD 20. In this case, the obtained power is smaller than that of the optical power supply system 1 described above in which all unused terminals are used for optical power supply, but the cost of laying optical fiber can be reduced.
  • all unused terminals on the station side of the optical splitter 30 are connected to the optical circulator 60.
  • the obtained power is smaller than that of the optical power supply system 1a described above in which all unused terminals are used for optical power supply, but the cost of laying optical fiber can be reduced.
  • optical power supply system 1c in the fourth embodiment described above was configured such that an optical circulator 60 that converts the direction of an upstream signal to a downstream signal is connected to an unused terminal on the station side of the optical splitter 30.
  • optical power supply system 1d the network path is folded back by connecting one unused terminal on the station side of the optical splitter 30 to another unused terminal on the station side with an optical fiber.
  • FIG. 9 is a diagram for explaining the return of a network path in a first modified example of the fourth embodiment of the present invention.
  • the optical splitter 30 in the first modified example is a multi-input, multi-output optical coupler in which the number of terminals on the station side and the number of terminals on the user premises side are both multiple.
  • the optical splitter 30 illustrated in FIG. 9 is an 8-to-8 input/output optical coupler in which the number of terminals on the station side and the number of terminals on the user premises side are eight each.
  • one of the terminals on the station side of the optical splitter 30 is connected to the light source 12 in the station.
  • three sets of terminals, each set consisting of two terminals, are connected to each other by optical fiber.
  • the remaining terminal on the station side of the optical splitter 30 is an unused terminal.
  • a return network path using optical fiber is installed only at the unused terminal on the office side of the optical splitter 30, but a return network path using optical fiber may be installed only at the unused terminal on the user's premises side of the optical splitter 30.
  • a return network path using optical fiber may be installed at both the unused terminal on the office side of the optical splitter 30 and the unused terminal on the user's premises.
  • the optical power supply system 1c in the fourth embodiment described above was configured such that an optical circulator 60 that converts an upstream signal into a downstream signal was connected to an unused terminal on the station side of the optical splitter 30. Also, the optical power supply system 1 in the first modified example of the fourth embodiment described above was configured to fold back the network path by connecting one unused terminal on the station side of the optical splitter 30 to another unused terminal on the station side with optical fiber.
  • optical power supply system 1e is configured to combine a network path return configuration using an optical circulator 60 similar to that in the fourth embodiment, and a network path return configuration using optical fiber similar to that in the first modified example of the fourth embodiment.
  • FIG. 10 is a diagram for explaining the return of a network path in a second modified example of the fourth embodiment of the present invention.
  • the optical splitter 30 in the second modified example is a multi-input, multi-output optical coupler in which the number of terminals on the station side and the number of terminals on the user premises side are both multiple.
  • the optical splitter 30 illustrated in FIG. 10 is an 8-to-8 input/output optical coupler in which the number of terminals on the station side and the number of terminals on the user premises side are eight each.
  • one of the terminals on the station side of the optical splitter 30 is connected to the light source 12 in the station. Also, of the remaining seven terminals on the station side of the optical splitter 30, three terminals are connected to the optical circulator 60. Also, of the remaining four terminals on the station side of the optical splitter 30, two terminals form a set, and two sets of terminals are connected to each other by optical fibers.
  • the optical power supply system 1e in the second modified example of the fourth embodiment can reduce installation costs by, for example, minimizing the use of the optical circulator 60 without wasting the power obtained from the optical signal output from the unused terminal.
  • the optical circulator 60 and the return network path using optical fiber are installed only at the unused terminal on the station side of the optical splitter 30, but the optical circulator 60 and the return network path using optical fiber may be installed only at the unused terminal on the user's premises side of the optical splitter 30.
  • the optical circulator 60 and the return network path using optical fiber may be installed at both the unused terminal on the station side of the optical splitter 30 and the unused terminal on the user's premises.
  • optical splitter 30 used in each of the above-mentioned embodiments and modifications is an existing optical splitter (optical coupler) of a PON, but is not limited to this. It is also possible to use any existing splitter or coupler that is installed in the city.
  • the unused terminals of the optical splitter are used for optical power supply, but this is not limited to this.
  • a method can be considered in which a branch end that is being used for another purpose or in another system is discontinued from use for that purpose or in that system, and instead switched to use for optical power supply.
  • the PD 20 and the like are installed inside the optical closure 2, but the PD 20 and the like may be installed near the outside of the optical closure 2.
  • the senor 40 in each of the above-mentioned embodiments and modifications include a thermometer, a weather sensor, a rainfall sensor, a hygrometer, a sound sensor, a camera, and a thermograph.
  • the sensor is not limited to these, and any sensor that operates with electricity can be used.
  • the optical power supply system includes an optical splitter, a folding unit, and a photodiode.
  • the optical power supply system is optical power supply systems 1c to 1e in the embodiment
  • the folding unit includes an optical circulator 60 in the embodiment, or an optical fiber connecting two terminals on one side of the optical splitter 30, and the photodiode is at least one PD 20 in the embodiment.
  • the optical splitter is a bidirectional optical splitter with multiple inputs and multiple outputs.
  • the return unit converts the upstream and downstream directions of the optical signal output from the optical splitter and re-inputs the optical signal to the optical splitter.
  • the photodiode receives a first optical signal sent from a first light source and transmitted through the optical splitter, and a second optical signal sent from a second light source and output to the return unit via the optical splitter, where the direction is converted, and then transmitted again through the optical splitter, and converts the first optical signal and the second optical signal into electrical signals.
  • the first light source is the light source 12 in the embodiment
  • the second light source is an ONU in each user's home in the embodiment
  • the first optical signal is an optical signal sent from the light source 12 in the embodiment
  • the second optical signal is an optical signal sent from the ONU in each user's home in the embodiment.
  • the return unit includes an optical circulator that outputs an optical signal input to one port from the other port.
  • the optical circulator is an optical circulator 60 having the configuration shown in FIG. 8 in the embodiment.
  • the return unit is connected to at least one side of a bidirectional optical splitter.
  • one side is the station side or the user home side in the embodiment.
  • the return section further includes an optical fiber that connects two terminals on one side of the bidirectional optical splitter.
  • the optical fiber is an optical fiber connected to a pair of terminals on one side (e.g., the station side) of the optical splitter 30 shown in FIG. 9 in the embodiment.
  • the optical circulator is connected to an odd number of terminals on one side of the bidirectional optical splitter.
  • the optical circulator is the optical circulator 60 shown in FIG. 10 in the embodiment.
  • the optical power supply system described above further includes a sensor.
  • the sensor is driven by the electrical signal output from the photodiode and monitors the device within the optical closure.
  • At least one of the first light source and the second light source is a Fabry-Perot laser.
  • the optical closure includes an optical splitter, a folding section, and a photodiode.
  • the optical closure is the optical closure 2 in the embodiment
  • the folding section includes the optical circulator 60 in the embodiment, or an optical fiber connecting two terminals on one side of the optical splitter 30, and the photodiode is at least one PD 20 in the embodiment.
  • a part of the configuration of the optical power supply system 1 and the optical power supply systems 1a to 1e in the above-mentioned embodiment 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 to realize the function.
  • computer system here includes hardware such as an OS and peripheral devices.
  • computer-readable recording medium refers to portable media such as flexible disks, optical magnetic disks, ROMs, and CD-ROMs, and storage devices such as hard disks built into a computer system.
  • the term "computer-readable recording medium” may also include a medium that dynamically holds a program for a short period of time, such as a communication line when a program is transmitted via a network such as the Internet or a communication line such as a telephone line, and a medium that holds a program for a certain period of time, such as a volatile memory inside a computer system that is the server or client in such a case.
  • the above program may be for realizing some of the functions described above, and may further be capable of realizing the functions described above in combination with a program already recorded in the computer system, or may be realized using a programmable logic device such as an FPGA (Field Programmable Gate Array).

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JP2018064231A (ja) * 2016-10-14 2018-04-19 日本電信電話株式会社 光通信システム及び給電方法
JP2018174478A (ja) * 2017-03-31 2018-11-08 東日本電信電話株式会社 光通話送受信器と光給電システム
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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Publication number Priority date Publication date Assignee Title
JP2006067014A (ja) * 2004-08-24 2006-03-09 Sumitomo Electric Ind Ltd 光通信機器および光伝送システム
CN101330764A (zh) * 2008-06-20 2008-12-24 北京邮电大学 一种光网络单元之间直接通信的方法和无源光网络系统
JP2018064231A (ja) * 2016-10-14 2018-04-19 日本電信電話株式会社 光通信システム及び給電方法
JP2018174478A (ja) * 2017-03-31 2018-11-08 東日本電信電話株式会社 光通話送受信器と光給電システム
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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