WO2022107333A1 - 光給電システム、受電側光通信装置及び電力供給方法 - Google Patents
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- 230000003287 optical effect Effects 0.000 title claims abstract description 496
- 238000004891 communication Methods 0.000 title claims abstract description 190
- 238000000034 method Methods 0.000 title claims description 33
- 230000005540 biological transmission Effects 0.000 claims abstract description 418
- 238000013500 data storage Methods 0.000 claims abstract description 75
- 238000001514 detection method Methods 0.000 claims description 27
- 238000011144 upstream manufacturing Methods 0.000 claims description 20
- 239000013307 optical fiber Substances 0.000 description 37
- 238000012545 processing Methods 0.000 description 17
- 230000004913 activation Effects 0.000 description 5
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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
- H04B10/806—Arrangements for feeding power
- H04B10/807—Optical power feeding, i.e. transmitting power using an optical signal
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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
- H04B10/40—Transceivers
- H04B10/43—Transceivers using a single component as both light source and receiver, e.g. using a photoemitter as a photoreceiver
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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
- H04B10/60—Receivers
- H04B10/66—Non-coherent receivers, e.g. using direct detection
- H04B10/69—Electrical arrangements in the receiver
Definitions
- the present invention relates to an optical power supply system, a power receiving side optical communication device, and a power supply method.
- FIG. 5 is a diagram for explaining a conventional optical power supply system. Note that FIG. 5 cites FIG. 2 of Patent Document 1.
- the optical power supply system shown in FIG. 5 includes a master unit 120 and three slave units 127-1, 127-2, 127-3.
- the master unit 120 and the slave units 127-1 to 127-3 are connected in a star shape via an optical fiber 125 and an optical turnout 126.
- the master unit 120 includes a power feeding laser light source 121 that emits light having a wavelength ⁇ p, a downlink communication optical transmitter 122 that emits light having a wavelength ⁇ d, and an uplink communication optical receiver 123 that receives light having a wavelength ⁇ u.
- Light having wavelengths ⁇ p, ⁇ d, and ⁇ u is combined and demultiplexed by the wavelength combiner / demultiplexer 124.
- Each of the slave units 127-1 to 127-3 is a power supply optical receiver 129-1 to 129-3 that receives light having a wavelength ⁇ p, and a downlink optical receiver 130-1 to 130 that receives light having a wavelength ⁇ d. It is provided with optical transmitters 131-1 to 131-3 for uplink communication that emit light having a wavelength of -3 and ⁇ u. Light having wavelengths ⁇ p, ⁇ d, and ⁇ u is combined and demultiplexed by wavelength combiners and demultiplexers 128-1 to 128-3.
- the downlink communication signal 132 having a wavelength ⁇ d transmitted by the master unit 120 is composed of repeating time frames 134 having a fixed time width.
- the slave unit identification information 133 is included in each time frame.
- the uplink communication signal 135 having a wavelength ⁇ u is a signal obtained by combining the communication signals of the light having a wavelength ⁇ u emitted by each of the uplink communication optical transmitters 131-1 to 131-3 by the optical turnout 126.
- the time width of the uplink communication signal 135 is a time width corresponding to the communication amount of each slave unit 127-1 to 127-3.
- the power supply optical receivers 129-1 to 129-3 provided in each of the slave units 127-1 to 127-3 output the power supply light output by the power supply laser light source 121 included in the master unit 120.
- the slave units 127-1 to 127-3 can receive power from the master unit 120.
- the downlink communication signal 132 having a wavelength ⁇ d transmitted by the master unit 120 is composed of repetitions of time frames 134 having a fixed time width, and each time frame 134 is assigned to each of the slave units 127-1 to 127-3. .. Therefore, each of the slave units 127-1 to 127-3 is in the operating state only for the time when the time frame 134 including the slave unit identification information 133 corresponding to the own unit is received, and shifts to the non-operating state at the other time. .. As a result, it is possible to eliminate the need for downlink communication standby in the slave units 127-1 to 127-3, so that the power consumption in the slave units 127-1 to 127-3 can be reduced.
- the slave units 127-1 to 127-3 must be started at regular intervals, that is, at intervals of time frames 134 ⁇ N having a fixed time width, so that data to be transmitted and received must be started. Power is consumed at regular intervals regardless of the presence or absence of (where N is the number of slave units 127-1 to 127-3). Therefore, if the amount of electricity stored in the slave units 127-1 to 127-3 is less than the amount of power required for startup and data processing, each of the slave units 127-1 to 127-3 is a parent due to a power shortage. There is a problem that the downlink communication signal 132 received from the machine 120 and the uplink communication signal 135 transmitted to the master unit 120 cannot be processed and may be discarded.
- the present invention provides a technique capable of preventing power from being consumed by unnecessary activation or operation when there is no data to be transmitted / received in an optical communication system powered by light. I am aiming.
- One aspect of the present invention is to supply data transmission / reception control information relating to an optical power supply unit that transmits an optical signal for power supply, a data transmission / reception unit that transmits / receives an optical signal of data, and data transmission / reception that the data transmission / reception unit transmits / receives.
- a power supply side optical communication device having a data control unit superimposed on the optical signal for power supply, a power storage unit for storing power obtained from the optical signal for power supply transmitted by the optical power supply unit, and a power storage unit for power supply.
- the optical transmission / reception unit that transmits / receives the optical signal of the data between the data transmission / reception unit, and the external device.
- An external transmission / reception unit for transmitting / receiving data, a data storage unit for storing data not transmitted to the power feeding side optical communication device or the external device, and the data transmission / reception control information detected by the control information detection unit.
- the optical transmission / reception unit and the external transmission / reception unit Based on the data stored in the data storage unit, the optical transmission / reception unit and the external transmission / reception unit detect the presence / absence of transmission and reception of the data, and the optical transmission / reception is determined according to the presence / absence of transmission and reception of the detected data.
- It is an optical power supply system including a power receiving side optical communication device having a transmission / reception unit or a power supply control unit for supplying power stored by the power storage unit to the external transmission / reception unit.
- One aspect of the present invention is to supply data transmission / reception control information relating to an optical power supply unit that transmits an optical signal for power supply, a data transmission / reception unit that transmits / receives an optical signal of data, and data transmission / reception that the data transmission / reception unit transmits / receives.
- a power receiving side optical communication device connected to a power feeding side optical communication device including a data control unit superimposing on the power feeding optical signal, and a power storage unit for storing power obtained from the power feeding optical signal.
- a control information detection unit that detects the data transmission / reception control information superimposed on the optical signal for power supply, an optical transmission / reception unit that transmits / receives the optical signal of the data between the data transmission / reception unit, and an external device.
- An external transmission / reception unit that transmits / receives the data between the data, a data storage unit that stores data that has not been transmitted to the power feeding side optical communication device or the external device, and the data transmission / reception control detected by the control information detection unit. Based on the information and the data stored in the data storage unit, the presence / absence of transmission and reception of the data in the optical transmission / reception unit and the external transmission / reception unit is detected, and the presence / absence of transmission and reception of the detected data is determined.
- a power receiving side optical communication device including the optical transmission / reception unit or a power supply control unit that supplies power stored by the power storage unit to the external transmission / reception unit.
- One aspect of the present invention is a power supply method in an optical power supply system including a power supply side optical communication device and a power reception side optical communication device, wherein the power supply side optical communication device relates to the power reception side optical communication device.
- Power is supplied by an optical signal for power supply, and the power storage unit of the power receiving side optical communication device stores the supplied power, and the data transmission / reception unit of the power supply side optical communication device and the power receiving side optical communication device
- the optical transmission / reception unit of the above transmits / receives the optical signal of the data, and the external transmission / reception unit of the power receiving side optical communication device and the external device transmit / receive the data to the data storage unit of the power receiving side optical communication device.
- Data that has not been transmitted to the power feeding side optical communication device or the external device is recorded, and the data control unit of the power feeding side optical communication device transmits data transmission / reception control information regarding transmission / reception of data transmitted / received by the data transmission / reception unit.
- the data transmission / reception control information superimposed on the power feeding optical signal and superimposed on the power feeding optical signal is detected by the control information detection unit of the power receiving side optical communication device, and the power receiving side optical communication is performed.
- the power supply control unit of the apparatus transmits the data in the optical transmission / reception unit and the external transmission / reception unit based on the data transmission / reception control information detected by the control information detection unit and the data stored in the data storage unit. Power supply in an optical power supply system that detects the presence or absence of reception and supplies power stored by the power storage unit to the optical transmission / reception unit or the external transmission / reception unit according to the presence / absence of transmission and reception of the detected data. The method.
- FIG. 1 is a block diagram showing a configuration of the optical power supply system 1 according to the first embodiment.
- the optical power supply system 1 includes two optical fibers 30 that connect a power supply side optical communication device 10, a power reception side optical communication device 20, an external device 40, and a power supply side optical communication device 10 and a power reception side optical communication device 20. 31 and.
- the power feeding side optical communication device 10 is, for example, an OLT (Optical Line Terminal).
- the power feeding side optical communication device 10 includes a data transmission / reception unit 11, an optical power feeding unit 12, and a data control unit 13.
- the data transmission / reception unit 11 is, for example, an optical transceiver, and includes a light source that emits light for data transmission inside.
- the data transmission / reception unit 11 converts the light emitted by the internal light source into an optical signal of data by modulating the light emitted from the internal light source based on the electric signal of the data given from the data control unit 13, and the optical signal of the converted data is an optical fiber. Send to 30.
- the data transmission / reception unit 11 is provided with, for example, an O / E (Optical / Electrical) converter such as a photodetector inside.
- the data transmission / reception unit 11 receives an optical signal of data received through the optical fiber 30, converts the optical signal of the received data into an electric signal by an O / E converter, and outputs the optical signal to the data control unit 13.
- O / E Optical / Electrical
- the data control unit 13 takes in the data to be transmitted to the power receiving side optical communication device 20 from the outside.
- the data control unit 13 generates electric signal data from the captured data, and outputs the generated electric signal data to the data transmission / reception unit 11 according to a transmission timing arbitrarily determined.
- the data control unit 13 captures the electrical signal data output by the data transmission / reception unit 11 according to a reception timing arbitrarily determined, and outputs the captured data to the outside.
- the data control unit 13 indicates the amount of scheduled data to be transmitted, the amount of receivable data indicating the amount of data that can be received, and the transmission / reception indicating the timing of data transmission / reception, at an arbitrarily determined timing.
- Data transmission / reception control information including timing information is generated, and the generated data transmission / reception control information is output to the optical power supply unit 12.
- the amount of data to be transmitted and the amount of receivable data are “0" or positive numerical values.
- the amount of data to be transmitted is "0"
- the value is other than "0" the data of the data amount of the corresponding value is used. It means that the power feeding side optical communication device 10 is scheduled to transmit.
- the receivable data amount is "0” it means that the power feeding side optical communication device 10 does not receive the data, and when the value is other than "0", the data of the data amount of the corresponding value is transmitted to the power feeding side. It means that the optical communication device 10 can receive data.
- the optical feeding unit 12 is provided with a light source that emits light for feeding inside, and the light source generates an optical signal for feeding and sends it to the optical fiber 31.
- the optical power supply unit 12 superimposes the data transmission / reception control information on the optical signal for power supply and transmits the data transmission / reception control information to the optical fiber 31.
- the external device 40 is, for example, a sensor node such as an IoT (Internet of Things) sensor.
- the external device 40 is connected to the power receiving side optical communication device 20 by a wireless or wired communication means.
- the external device 40 transmits, for example, the data measured by the sensor provided inside to the power receiving side optical communication device 20 at a predetermined fixed cycle.
- the external device 40 receives the data transmitted by the power receiving side optical communication device 20.
- a plurality of external devices 40 may exist, and in this case, the plurality of external devices 40 are connected to the power receiving side optical communication device 20 by wireless or wired communication means.
- the power receiving side optical communication device 20 is, for example, an ONU (Optical Network Unit).
- the power receiving side optical communication device 20 includes an optical transmission / reception unit 21, an optical power reception unit 22, a power storage unit 23, a control information detection unit 24, an external transmission / reception unit 25, a data storage unit 26, and a power supply control unit 27.
- the optical transmission / reception unit 21 is, for example, an optical transceiver, and includes a light source that emits light for data transmission inside.
- the optical transmission / reception unit 21 converts the light emitted by the internal light source into an optical signal of data by modulating the light emitted from the internal light source based on the electric signal of the data read from the data storage unit 26, and the optical signal of the converted data is converted into an optical fiber 30.
- the optical transmission / reception unit 21 is provided with an O / E converter such as a photodetector inside, receives an optical signal of data received through an optical fiber 30, and converts the optical signal of the received data into the O / E conversion. It is converted into an electric signal by a device and output to the external transmission / reception unit 25.
- the optical power receiving unit 22 is, for example, an O / E converter, receives an optical signal for power supply received through an optical fiber 31, and converts the received optical signal for power supply into an electric signal.
- the optical power receiving unit 22 outputs the converted electric signal to the power storage unit 23.
- the power storage unit 23 is, for example, a battery, and performs a charging process based on an electric signal output by the optical power receiving unit 22, and stores the electric power of the electric signal.
- the power storage unit 23 supplies electric power necessary for operation to the optical power receiving unit 22, the control information detection unit 24, the data storage unit 26, and the power supply control unit 27.
- the control information detection unit 24 detects the data transmission / reception control information superimposed on the electric signal for power supply converted by the optical power receiving unit 22.
- the external transmission / reception unit 25 is connected to the external device 40 by wireless or wired communication means.
- a Wi-Fi module Wi-Fi is a registered trademark
- the external transmission / reception unit 25 receives data to be transmitted by the external device 40 at a predetermined fixed cycle, and writes the received data in the data storage unit 26 to store the data.
- the external transmission / reception unit 25 captures the data output by the optical transmission / reception unit 21 and transmits the captured data to the external device 40.
- the external transmission / reception unit 25 reads the data from the data storage unit 26 and transmits the read data to the external device 40.
- the data storage unit 26 stores the data received from the external device 40 by the external transmission / reception unit 25 as upstream data.
- the data storage unit 26 stores data that the optical transmission / reception unit 21 did not output to the external transmission / reception unit 25 as downlink data.
- the data in the upstream direction is data received by the power receiving side optical communication device 20 from the external device 40 and transmitted to the power feeding side optical communication device 10
- the data in the downlink direction is data in the power receiving side optical communication device 20. Is the data received from the power feeding side optical communication device 10 and transmitted to the external device 40.
- the data in the upstream direction includes the data received by the power receiving side optical communication device 20 from the external device 40 and not transmitted to the power feeding side optical communication device 10, and the data in the downlink direction includes the power receiving side optical communication device.
- 20 includes data that is received from the power feeding side optical communication device 10 and is not transmitted to the external device 40, and these non-transmitting data are used for control processing in the power receiving side optical communication device 20 and the like, and are used in the data storage unit 26. Will be erased from.
- the power supply control unit 27 detects the presence / absence of data to be transmitted / received by the optical transmission / reception unit 21, and if there is data to be transmitted / received, the optical transmission / reception unit 21 transfers the power stored in the storage unit 23 at the timing of transmitting / receiving the data. Supply to.
- the power supply control unit 27 detects the presence / absence of data to be transmitted by the external transmission / reception unit 25, and if there is data to be transmitted, the external transmission / reception unit 25 transfers the power stored in the power storage unit 23 at the timing of transmitting the data. Supply to.
- the power supply control unit 27 stores information indicating the timing of a fixed cycle in which the external transmission / reception unit 25 receives data from the external device 40 in advance in the internal storage area, and the power storage unit 23 stores the data in the fixed cycle.
- the current power is supplied to the external transmission / reception unit 25.
- one optical fiber 30 transmits a downlink optical signal transmitted by the power supply side optical communication device 10 and received by the power reception side optical communication device 20 and transmitted by the power reception side optical communication device 20. Then, the optical signal in the upstream direction received by the power feeding side optical communication device 10 is transmitted. Therefore, in the optical fiber 30, the light source internally provided in the data transmission / reception unit 11 and the light source internally provided in the optical transmission / reception unit 21 are respectively so that the optical signal in the downlink direction and the optical signal in the uplink direction do not interfere with each other. It is designed to emit light of different wavelengths.
- the data transmission / reception unit 11 and the optical transmission / reception unit 21 are internally provided with an optical combiner / demultiplexer that combines and demultiplexes these different wavelengths.
- the connection cannot be made because the wireless environment is not good, and the external transmission / reception unit 25 transmits data to the external device 40.
- the process of transmitting the data by the external device 40 is prioritized over the process of receiving the data by the external device 40.
- the transmission / reception unit 25 is receiving data from the external device 40, it is assumed that the process of transmitting data to the external device 40 is suspended. In such a state, the optical transmission / reception unit 21 does not output the data to the external transmission / reception unit 25, but writes the data as downlink data and stores it in the data storage unit 26.
- the external transmission / reception unit 25 To detect a state in which the external transmission / reception unit 25 cannot transmit data to the external device 40, for example, the external transmission / reception unit 25 has a flag in the internal storage area indicating the connection state with the external device 40, and the external device 40 has a flag. When the data can be transmitted, the flag is set to "1", and when the data cannot be transmitted to the external device 40, the flag is set to "0". Before outputting the data to the external transmission / reception unit 25, the optical transmission / reception unit 21 refers to the flag and outputs the data to the external transmission / reception unit 25, or the data storage unit 26 without outputting the data to the external transmission / reception unit 25. To determine whether to write to and memorize.
- FIG. 2 is a flowchart showing the operation of the power receiving side optical communication device 20, and the power supply process in the optical power supply system 1 will be described with reference to the flowchart.
- the optical power supply unit 12 of the power supply side optical communication device 10 generates an optical signal for power supply, and transmits the generated optical signal for power supply to the power reception side optical communication device 20 through the optical fiber 31.
- the data control unit 13 generates data transmission / reception control information at an arbitrarily determined timing, and outputs the generated data transmission / reception control information to the optical power supply unit 12.
- the optical power supply unit 12 receives the data transmission / reception control information from the data control unit 13, the optical power supply unit 12 superimposes the received data transmission / reception control information on the optical signal for power supply and transmits the received data transmission / reception control information.
- the optical power receiving unit 22 of the power receiving side optical communication device 20 receives the optical signal for power supply through the optical fiber 31, the received optical signal for power supply is converted into an electric signal, and the converted electric signal is output to the power storage unit 23. do.
- the power storage unit 23 performs a charging process based on the electric signal output by the optical power receiving unit 22, and stores the electric power of the electric signal.
- the external device 40 transmits the data measured by the sensor provided inside to the power receiving side optical communication device 20 at a predetermined fixed cycle. Therefore, the power supply control unit 27 of the power receiving side optical communication device 20 supplies the power stored by the power storage unit 23 to the external transmission / reception unit 25 at the fixed cycle. As a result, the external transmission / reception unit 25 of the power receiving side optical communication device 20 can receive the data transmitted by the external device 40, and writes the received data as upstream data and stores it in the data storage unit 26.
- the control information detection unit 24 of the power receiving side optical communication device 20 performs data transmission / reception control information detection processing on the electric signal output by the optical power receiving unit 22 (step S1), and the data transmission / reception control information is superimposed on the electric signal. It is determined whether or not it is (step S2). When the control information detection unit 24 determines that the data transmission / reception control information is not superimposed on the electric signal output by the optical power receiving unit 22 (steps S2 and No), the control information detection unit 24 performs the process of step S1 again.
- control information detection unit 24 determines that the data transmission / reception control information is superimposed on the electric signal output by the optical power receiving unit 22 (step S2, Yes)
- the data transmission / reception control information superimposed on the electric signal Is read and the read data transmission / reception control information is output to the power supply control unit 27.
- the power supply control unit 27 When the power supply control unit 27 captures the data transmission / reception control information output by the control information detection unit 24, the power supply control unit 27 changes the amount of scheduled transmission data included in the captured data transmission / reception control information, the amount of receivable data, and the transmission / reception timing information. Read (step S3).
- the power supply control unit 27 detects the presence / absence of data transmitted by the optical transmission / reception unit 21. Specifically, first, the power supply control unit 27 determines whether or not the data storage unit 26 stores data in the upstream direction. The power supply control unit 27 determines whether or not the receivable data amount is "0" when the data storage unit 26 has upstream data, and when the receivable data amount is not "0", the optical transmission / reception unit 27. It is determined that the data transmitted by 21 exists. In the power supply control unit 27, the data transmission / reception unit 11 receives the data even when the data storage unit 26 does not have the upstream data or the data storage unit 26 has the upstream data. When the amount of receivable data is "0", the optical transmission / reception unit 21 determines that there is no data to be transmitted (step S4).
- the power supply control unit 27 detects the presence / absence of data received by the optical transmission / reception unit 21. Specifically, the power supply control unit 27 determines whether or not the scheduled transmission data amount is "0", and if the transmission scheduled data amount is not "0", it is determined that the data received by the optical transmission / reception unit 21 exists. do. When the amount of data to be transmitted is "0", the power supply control unit 27 determines that there is no data to be received by the optical transmission / reception unit 21 (step S5).
- the power supply control unit 27 detects the presence / absence of data transmitted by the external transmission / reception unit 25. Specifically, the power supply control unit 27 determines whether or not the data storage unit 26 stores data in the downward direction, or whether or not the amount of data to be transmitted is "0", and the data storage unit 26 determines. If the data in the downlink direction is stored, or if the amount of data to be transmitted is not "0", it is determined that the data to be transmitted by the external transmission / reception unit 25 exists.
- the power supply control unit 27 determines that the data to be transmitted by the external transmission / reception unit 25 does not exist (there is no data to be transmitted by the external transmission / reception unit 25). Step S6).
- the power supply control unit 27 When the power supply control unit 27 detects that the data to be transmitted by the optical transmission / reception unit 21 exists, the power supply control unit 27 receives light at the timing when the power supply side optical communication device 10 indicated by the transmission / reception timing information read from the data transmission / reception control information can be received. The power stored by the power storage unit 23 is supplied to the transmission / reception unit 21. When the power supply control unit 27 detects that the data to be received by the optical transmission / reception unit 21 exists, the power supply control unit 27 performs optical transmission / reception at the timing of the transmission schedule of the power supply side optical communication device 10 indicated by the transmission / reception timing information read from the data transmission / reception control information. The power stored by the power storage unit 23 is supplied to the unit 21.
- the power supply control unit 27 detects the existence of data to be transmitted by the external transmission / reception unit 25, the power supply control unit 27 performs external transmission / reception at the timing of the transmission schedule of the power feeding side optical communication device 10 indicated by the transmission / reception timing information read from the data transmission / reception control information.
- the power stored by the power storage unit 23 is supplied to the unit 25 (step S7).
- the power supply control unit 27 has the power storage unit 23 in the external transmission / reception unit 25 at an arbitrary timing. The electric power to be stored may be supplied.
- the optical transmission / reception unit 21 is activated at the timing when the power feeding side optical communication device 10 indicated by the transmission / reception timing information can be received, reads the upstream data stored in the data storage unit 26, and transmits / receives the read data. It is transmitted to the unit 11.
- the optical transmission / reception unit 21 and the external transmission / reception unit 25 are activated at the timing of the transmission schedule of the power feeding side optical communication device 10 indicated by the transmission / reception timing information, and the optical transmission / reception unit 21 receives and receives the data transmitted by the data transmission / reception unit 11.
- the data is output to the external transmission / reception unit 25.
- the external transmission / reception unit 25 captures the data output by the optical transmission / reception unit 21 and transmits the captured data to the external device 40.
- the external transmission / reception unit 25 reads the data in the downlink direction from the data storage unit 26 and transmits the read data to the external device 40.
- the optical transmission / reception unit 21 When the external transmission / reception unit 25 is in a state where data cannot be transmitted to the external device 40, the optical transmission / reception unit 21 does not output the data to the external transmission / reception unit 25, and the data storage unit uses the data as downlink data. It is written in 26 and stored, and the external transmission / reception unit 25 does not read the data in the downward direction from the data storage unit 26, but keeps the data stored.
- the power feeding side optical communication device 10 supplies power to the power receiving side optical communication device 20 by an optical signal for power supply, and the power storage unit 23 supplies the supplied power.
- the data transmission / reception unit 11 and the optical transmission / reception unit 21 transmit and receive optical signals of data.
- the external transmission / reception unit 25 and the external device 40 transmit / receive data.
- the data storage unit 26 stores data that has not been transmitted to the power feeding side optical communication device 10 or the external device 40.
- the data control unit 13 generates data transmission / reception control information related to transmission / reception of data transmitted / received by the data transmission / reception unit 11, and superimposes the generated data transmission / reception control information on an optical signal for power supply.
- the control information detection unit 24 detects the data transmission / reception control information superimposed on the optical signal for power supply.
- the power supply control unit 27 transmits and receives data in the optical transmission / reception unit 21 and the external transmission / reception unit 25 based on the data transmission / reception control information detected by the control information detection unit 24 and the data stored in the data storage unit 26. Is detected, and the power stored by the power storage unit 23 is supplied to the optical transmission / reception unit 21 or the external transmission / reception unit 25 according to the presence or absence of transmission and reception of the detected data.
- the power supply control unit 27 supplies power to each of the optical transmission / reception unit 21 and the external transmission / reception unit 25 only when there is data to be transmitted / received. Therefore, it is possible to prevent the power from being consumed by unnecessary activation or operation when there is no data to be transmitted / received, and it is possible to efficiently use the power stored in the power storage unit 23.
- the power supply control unit 27 may change the order of the processes of step S4 and step S5 step S6 in any order to perform the process.
- the optical power supply system 1 of the first embodiment includes a configuration for transmitting data in the optical transmission / reception unit 21 and a configuration for receiving data as a unit.
- the external transmission / reception unit 25 has a configuration for transmitting data and a configuration for receiving data as a unit. Therefore, for example, in the optical transmission / reception unit 21, when the data to be transmitted exists but the data to be received does not exist, or when the data to be received exists but the data to be transmitted does not exist. Even so, the power supply control unit 27 had to supply the power required for activation and operation to the optical transmission / reception unit 21.
- the power supply control unit 27 needs to supply the power required for starting and operating the external transmission / reception unit 25.
- FIG. 3 is a block diagram showing a configuration of the optical power supply system 1a of the second embodiment.
- the same configurations as those of the optical power supply system 1 of the first embodiment are designated by the same reference numerals, and different configurations will be described below.
- the optical power supply system 1a includes two optical fibers 30 that connect the power supply side optical communication device 10, the power reception side optical communication device 20a, the external device 40, and the power supply side optical communication device 10 and the power reception side optical communication device 20a. 31 and.
- the power receiving side optical communication device 20a is, for example, an ONU, and includes an optical transmission / reception unit 21a, an optical power reception unit 22, a power storage unit 23, a control information detection unit 24, an external transmission / reception unit 25a, a data storage unit 26, and a power supply control unit 27a. ..
- the optical transmission / reception unit 21a includes an optical transmission unit 21T, an optical reception unit 21R, and an optical duplexer 28.
- the optical transmission unit 21T corresponds to, for example, the configuration of a transmission unit of an optical transceiver, and includes a light source that emits light for data transmission inside.
- the optical transmission unit 21T converts the light emitted by the internal light source into an optical signal of data by modulating it based on the electrical signal of the data in the upstream direction read from the data storage unit 26, and converts the converted optical signal of the data into an optical signal. , Is sent to the optical fiber 30 via the optical duplexer 28.
- the optical receiving unit 21R corresponds to, for example, the configuration of a receiving unit of an optical transceiver, and includes an O / E converter such as a photodetector inside.
- the optical receiver 21R receives an optical signal of data received through the optical fiber 30 and the optical duplexer 28, converts the optical signal of the received data into an electric signal by the O / E converter, and converts it into an electric signal to an external transmitter. Output to 25T.
- the data transmission / reception unit 11 includes an optical combiner / demultiplexer that combines and demultiplexes these different wavelengths.
- the optical transmission / reception unit 21a includes an optical combiner / demultiplexer 28 that combines and demultiplexes these different wavelengths between the optical fiber 30 and the optical transmission unit 21T and the optical reception unit 21R.
- the external transmission / reception unit 25a includes an external transmission unit 25T and an external reception unit 25R.
- the external transmission unit 25T and the external reception unit 25R are connected to the external device 40 by wireless or wired communication means.
- the transmission portion of the Wi-Fi module is applied as the external transmission unit 25T, and the Wi-Fi as the external reception unit 25R.
- the receiving part of the module is applied.
- the external transmission unit 25T captures the data output by the optical reception unit 21R and transmits the captured data to the external device 40.
- the external transmission unit 25T reads the data from the data storage unit 26 and transmits the read data to the external device 40.
- the external receiving unit 25R receives data to be transmitted by the external device 40 at a predetermined fixed cycle, and writes the received data in the data storage unit 26 to store the data.
- the power supply control unit 27a detects the presence / absence of data to be transmitted by the optical transmission unit 21T, and if there is data to be transmitted, the optical transmission unit 21T transfers the electric power stored in the power storage unit 23 at the timing of transmitting the data. Supply to.
- the power supply control unit 27a detects the presence / absence of data to be received by the optical reception unit 21R, and if there is data to be received, the optical reception unit 21R uses the power stored in the power storage unit 23 at the timing of receiving the data. Supply to.
- the power supply control unit 27a detects the presence / absence of data to be transmitted by the external transmission unit 25T, and if there is data to be transmitted, the power storage unit 23 transfers the power stored in the power storage unit 25T at the timing of transmitting the data. Supply to.
- the power supply control unit 27a stores information indicating the timing of a fixed cycle in which the external receiving unit 25R transmits data from the external device 40 in advance in the internal storage area, and the power storage unit 23 stores the data in the fixed cycle. The current power is supplied to the external receiving unit 25R.
- the connection cannot be made because the wireless environment is not good, and the external transmission unit 25T transmits the data to the external device 40.
- the process of transmitting data by the external device 40 is prioritized over the process of receiving data by the external device 40, and external transmission / reception is prioritized.
- the optical receiving unit 21R does not output the data to the external transmitting unit 25T, but writes the data as downlink data and stores it in the data storage unit 26.
- the external transmission unit 25T To detect a state in which the external transmission unit 25T cannot transmit data to the external device 40, for example, the external transmission unit 25T has a flag in the internal storage area indicating the connection state with the external device 40, and the external device 40 has a flag. When the data can be transmitted, the flag is set to "1", and when the data cannot be transmitted to the external device 40, the flag is set to "0". Before outputting the data to the external transmission unit 25T, the optical reception unit 21R refers to the flag and outputs the data to the external transmission unit 25T, or the data storage unit 26 without outputting the data to the external transmission unit 25T. To determine whether to write to and memorize.
- FIG. 4 is a flowchart showing the operation of the power receiving side optical communication device 20a, and the power supply process in the optical power supply system 1a will be described with reference to the flowchart.
- the optical power feeding unit 12 of the power feeding side optical communication device 10 generates an optical signal for power feeding, and transmits the generated optical signal for power feeding to the power receiving side optical communication device 20a through the optical fiber 31.
- the data control unit 13 generates data transmission / reception control information at an arbitrarily determined timing, and outputs the generated data transmission / reception control information to the optical power supply unit 12.
- the optical power supply unit 12 receives the data transmission / reception control information from the data control unit 13, the optical power supply unit 12 superimposes the received data transmission / reception control information on the optical signal for power supply and transmits the received data transmission / reception control information.
- the optical power receiving unit 22 of the power receiving side optical communication device 20a receives the optical signal for power supply through the optical fiber 31, the received optical signal for power supply is converted into an electric signal, and the converted electric signal is output to the power storage unit 23. do.
- the power storage unit 23 performs a charging process based on the electric signal output by the optical power receiving unit 22, and stores the electric power of the electric signal.
- the external device 40 transmits the data measured by the sensor provided inside to the power receiving side optical communication device 20a at a predetermined fixed cycle. Therefore, the power supply control unit 27a of the power receiving side optical communication device 20a supplies the power stored by the power storage unit 23 to the external reception unit 25R at the fixed cycle. As a result, the external receiving unit 25R of the power receiving side optical communication device 20a can receive the data transmitted by the external device 40, and writes the received data as upstream data and stores it in the data storage unit 26.
- step Sa1 to step Sa3 the same processing as in steps S1 to S3 of the first embodiment shown in FIG. 2 is performed by the control information detection unit 24 of the power receiving side optical communication device 20a and the power supply control unit 27a. Will be done.
- the power supply control unit 27a detects the presence / absence of data transmitted by the optical transmission unit 21T. Specifically, first, the power supply control unit 27a determines whether or not the data storage unit 26 stores data in the upstream direction. The power supply control unit 27a determines whether or not the receivable data amount is "0" when the data storage unit 26 has upstream data, and when the receivable data amount is not "0", the optical transmission unit 27a determines. It is determined that the data transmitted by the 21T exists. In the power supply control unit 27a, the data transmission / reception unit 11 receives the data even when the data storage unit 26 does not have the upstream data or the data storage unit 26 has the upstream data. When the amount of receivable data is "0", it is determined that there is no data to be transmitted by the optical transmission unit 21T (step Sa4).
- the power supply control unit 27a detects the presence / absence of data received by the optical reception unit 21R. Specifically, the power supply control unit 27a determines whether or not the scheduled transmission data amount is "0", and if the transmission scheduled data amount is not "0", it is determined that the data received by the optical receiving unit 21R exists. do. When the amount of data to be transmitted is "0", the power supply control unit 27a determines that there is no data to be received by the optical reception unit 21R (step Sa5).
- the power supply control unit 27a detects the presence / absence of data transmitted by the external transmission unit 25T. Specifically, the power supply control unit 27a determines whether or not the data storage unit 26 stores data in the downward direction, or whether or not the amount of data to be transmitted is "0", and the data storage unit 26. If the data in the downward direction is stored, or if the amount of data to be transmitted is not "0", it is determined that the data to be transmitted by the external transmission unit 25T exists. When the data storage unit 26 does not store the data in the downward direction and the amount of data to be transmitted is "0", the power supply control unit 27a determines that the data to be transmitted by the external transmission unit 25T does not exist (there is no data to be transmitted by the external transmission unit 25T). Step Sa6).
- the optical power control unit 27a When the power supply control unit 27a detects that the data transmitted by the optical transmission unit 21T exists, the optical power control unit 27a is optical at the timing when the power supply side optical communication device 10 indicated by the transmission / reception timing information read from the data transmission / reception control information can be received. The power stored by the power storage unit 23 is supplied to the transmission unit 21T. When the power supply control unit 27a detects that the data to be received by the optical reception unit 21R exists, the power supply control unit 27a receives optical light at the timing of the transmission schedule of the power feeding side optical communication device 10 indicated by the transmission / reception timing information read from the data transmission / reception control information. The power stored by the power storage unit 23 is supplied to the unit 21R.
- the power supply control unit 27a When the power supply control unit 27a detects that the data to be transmitted by the external transmission unit 25T exists, the power supply control unit 27a transmits externally at the timing of the transmission schedule of the power feeding side optical communication device 10 indicated by the transmission / reception timing information read from the data transmission / reception control information.
- the power stored by the power storage unit 23 is supplied to the unit 25T (step Sa7).
- the power supply control unit 27a When the data storage unit 26 stores the data in the downward direction, but the amount of data to be transmitted is "0", the power supply control unit 27a has the power storage unit 23 in the external transmission unit 25T at an arbitrary timing. The electric power to be stored may be supplied.
- the optical transmission unit 21T is activated at the timing when the power feeding side optical communication device 10 indicated by the transmission / reception timing information can be received, reads the upstream data stored in the data storage unit 26, and transmits / receives the read data. It is transmitted to the unit 11.
- the optical reception unit 21R and the external transmission unit 25T are activated at the timing of the transmission schedule of the power feeding side optical communication device 10 indicated by the transmission / reception timing information, and the optical reception unit 21R receives and receives the data transmitted by the data transmission / reception unit 11.
- the generated data is output to the external transmission unit 25T.
- the external transmission unit 25T captures the data output by the optical reception unit 21R and transmits the captured data to the external device 40.
- the external transmission unit 25T reads the data in the downward direction from the data storage unit 26 and transmits the read data to the external device 40.
- the optical reception unit 21R does not output the data to the external transmission unit 25T, and the data storage unit uses the data as downlink data. It is written and stored in the 26, and the external transmission unit 25T does not read the data in the downlink direction from the data storage unit 26, but keeps the data stored.
- the optical transmission / reception unit 21 includes an optical transmission unit 21T and an optical reception unit 21R.
- the external transmission / reception unit 25 includes an external transmission unit 25T and an external reception unit 25R.
- the power supply control unit 27a determines whether or not the optical transmission unit 21T and the external transmission unit 25T transmit data, and the optical reception unit 21R receives the data.
- the power storage unit 23 supplies power to the optical transmission unit 21T, the optical reception unit 21R, or the external transmission unit 25T according to the presence / absence of transmission and reception of the detected data.
- the power supply control unit 27a supplies electric power to each of the optical transmission unit 21T and the external transmission unit 25T only when there is data to be transmitted, and the data to be received is sent to the optical reception unit 21R. Power is supplied only when it exists. Therefore, it is possible to prevent the power from being consumed by unnecessary activation or operation when there is no data to be transmitted / received, and it is possible to efficiently use the power stored in the power storage unit 23. Further, in the second embodiment, the optical transmission unit 21T and the optical reception unit 21R are separately provided, and the external transmission unit 25T and the external reception unit 25R are separately provided.
- the electric power required for the optical receiving unit 21R to start and operate may be supplied to the optical receiving unit 21R, and the electric power to be supplied in this case. Is sufficient with a smaller amount of power than the power for activating and operating the optical transmission / reception unit 21 of the first embodiment. Therefore, the power receiving side optical communication device 20a of the second embodiment can supply more appropriate power than the power receiving side optical communication device 20 of the first embodiment, and therefore, from the first embodiment. However, it is possible to suppress the consumption of electric power and efficiently use the electric power stored in the storage unit 23.
- the power supply control unit 27a may change the order of the processes of step Sa4, step Sa5, and step Sa6 in any order to perform the process.
- the power supply control unit 27a when the power supply control unit 27a detects that the amount of data stored in the data storage unit 26 has increased and the storage capacity of the data storage unit 26 has reached the limit, the power supply control unit 27a Does not supply power based on the data transmission / reception control information, and does not receive data from the power feeding side optical communication device 10 and the external device 40 until the storage capacity of the data storage unit 26 has a margin. Therefore, it is possible not to supply power to the optical receiving unit 21R and the external receiving unit 25R.
- the optical power supply system 1, 1a may include a plurality of power receiving side optical communication devices 20, 20a, and in this case, the power feeding side optical communication device 10 and a plurality of power supply side optical communication devices 10.
- Each of the power receiving side optical communication devices 20 and 20a is connected by a single star type communication network. Since it is connected by a single star type communication network, the power feeding side optical communication device 10 includes a data transmission / reception unit 11 and an optical power supply unit 12 having a number corresponding to the number of the plurality of power receiving side optical communication devices 20 and 20a. become.
- Each of the plurality of data transmission / reception units 11 is provided with an optical transmission / reception unit 21 included in each of the plurality of power receiving side optical communication devices 20 by each of the optical fibers 30 having the same number of optical fibers 30 as the number of the plurality of power receiving side optical communication devices 20 and 20a. , Or one-to-one connection to the optical combiner / demultiplexer 28 included in each of the plurality of power receiving side optical communication devices 20a.
- Each of the plurality of optical power feeding units 12 is provided with each of the plurality of power receiving side optical communication devices 20 and 20a by the number of optical fibers 31 corresponding to the number of the plurality of power receiving side optical communication devices 20 and 20a. It is connected to the unit 22 on a one-to-one basis.
- the reason for connecting with the single star type communication network is to make the amount of light received by the optical power receiving unit 22 of the power receiving side optical communication devices 20 and 20a sufficient.
- the amount of light received by the optical receiving unit 22 of the power receiving side optical communication devices 20 and 20a becomes small, but even if the passive star type is applied. If the amount of light received by the optical power receiving unit 22 of the power receiving side optical communication devices 20 and 20a can be made sufficient, the passive star type may be applied.
- the data transmission / reception unit 11 does not need to have an optical duplexer inside, and in the first embodiment, the optical transceiver 21 does not need to have an optical duplexer inside, and the second embodiment is performed. In the embodiment, it is not necessary to provide the optical duplexer 28.
- the transmission port of the data transmission / reception unit 11 and the reception port of the optical transmission / reception unit 21 are connected to the optical fiber for the downlink direction, and the reception port of the data transmission / reception unit 11 and the reception port of the optical transmission / reception unit 21
- the transmitting port will be connected to the optical fiber for the upstream direction.
- the transmission port of the data transmission / reception unit 11 and the optical reception unit 21R are connected to the optical fiber for the downlink direction, and the reception port of the data transmission / reception unit 11 and the optical transmission unit 21T are connected to each other. It will be connected to a directional optical fiber.
- the optical fiber 31 is not provided, only the optical fiber 30 is provided, and the wavelength of the light emitted by the light source internally provided in the data transmission / reception unit 11 and the light source internally provided in the optical transmission / reception unit 21 or the optical transmission unit 21T are emitted.
- the optical signal may be transmitted and received by wavelength multiplexing, with the wavelength of the light to be generated and the wavelength of the light emitted by the light source provided inside the optical feeding unit 12 being different.
- the data transmission / reception unit 11 and the optical transmission / reception unit 21 are not provided with an optical duplexer inside, but the power feeding side optical communication device 10 is the transmission port of the data transmission / reception unit 11.
- the device 20 connects to the transmitting port and receiving port of the optical transmitting / receiving unit 21 and the receiving port of the optical receiving unit 22 on one side, and connects to the optical fiber 30 on the other side to combine and demultiplex light of three different wavelengths. It will be equipped with an optical duplexer.
- the data transmission / reception unit 11 does not have an optical duplexer inside, but the power supply side optical communication device 10 transmits the transmission port and reception port of the data transmission / reception unit 11 and the optical power supply unit 12.
- the optical combiner / demultiplexer 28 of the power receiving side optical communication device 20a is provided with an optical combiner / demultiplexer connected to the port on one side and connected to the optical fiber 30 on the other side to combine and demultiplex the light of three different wavelengths. Further, it is connected to the light receiving unit 22 and has a configuration in which light of three different wavelengths is combined and demultiplexed.
- the data storage unit 26 is shown to be included in the power receiving side optical communication devices 20, 20a, but the optical power supply system 1, 1a replaces the data storage unit 26 with the power receiving side optical communication.
- An external data storage device connected to the devices 20 and 20a may be provided.
- the optical power supply systems 1 and 1a may be configured not to include the external device 40.
- the power supply control unit 27 is the external transmission / reception unit 25.
- the power supply control unit 27a supplies electric power to the external receiving unit 25R at the fixed interval, and does not receive data from the external device 40 even after the fixed interval has passed. In that case, the power supply may be temporarily stopped.
- the data control unit 13 of the power feeding side optical communication device 10 takes in the data to be transmitted to the power receiving side optical communication device 20 from the outside and outputs the data to the data transmission / reception unit 11. And the process of taking in the data of the electric signal output by the data transmission / reception unit 11 and outputting it to the outside.
- the data control unit 13 does not perform data input / output processing with the data transmission / reception unit 11, but the data transmission / reception unit 11 takes in data given from the outside and receives data from the receiving side optical communication device 20.
- the process of transmitting to 20a and the process of outputting the data received from the power receiving side optical communication devices 20 and 20a to the outside are performed, and the data control unit 13 monitors and transmits the data input / output process of the data transmission / reception unit 11.
- the scheduled data amount, the receivable data amount, and the transmission / reception timing information may be detected.
- the data control unit 13 when the data control unit 13 generates data transmission / reception control information, the data control unit 13 is further between the power receiving side optical communication devices 20 and 20a and the external device 40, which are arbitrarily determined. External device transmission / reception timing information indicating the transmission / reception timing of the device may be included.
- the data transmission / reception control information includes the external device transmission / reception timing information
- the power supply control unit 27 detects that the data transmitted by the external transmission / reception unit 25 exists in the process of step S7.
- the external transmission / reception unit is at the timing of transmission to the external device 40 indicated by the external device transmission / reception timing information included in the data transmission / reception control information.
- the power storage unit 23 will supply the power to be stored in the 25.
- the power supply control unit 27 stores the data in the external transmission / reception unit 25 at the timing of receiving the data transmitted by the external device 40 indicated by the external device transmission / reception timing information included in the data transmission / reception control information. 23 supplies electric power to be stored. Further, before the external device 40 transmits the data, the information indicating the amount of data to be transmitted may be transmitted to the power receiving side communication device 20, and in this case, the power supply control unit 27 may transmit the information indicating the amount of data to be transmitted. Power may be supplied to the external transmission / reception unit 25 based on the amount of data scheduled to be transmitted by the external device 40 received from the 40.
- the power supply control unit 27a detects that the data transmitted by the external transmission unit 25T exists in the process of step Sa7. If so, instead of the timing of the transmission schedule of the power feeding side optical communication device 10 indicated by the transmission / reception timing information, the external device transmission / reception timing information included in the data transmission / reception control information indicates the transmission timing to the external device 40. The power stored by the power storage unit 23 will be supplied to the transmission unit 25T.
- the power supply control unit 27a stores the data in the external reception unit 25R at the timing of receiving the data transmitted by the external device 40 indicated by the external device transmission / reception timing information included in the data transmission / reception control information. 23 supplies electric power to be stored. Further, before the external device 40 transmits the data, the information indicating the amount of data to be transmitted may be transmitted to the power receiving side communication device 20a. In this case, the power supply control unit 27a may transmit the information indicating the amount of data to be transmitted to the external device. Power may be supplied to the external receiving unit 25R based on the amount of data scheduled to be transmitted by the external device 40 received from the 40.
- the power supply control units 27 and 27a monitor the amount of electric power stored by the power storage unit 23, and for example, the remaining electric power amount is equal to or less than a predetermined threshold value.
- which of the optical transmission unit 21T, the optical reception unit 21R, the external transmission unit 25T, and the external reception unit 25R is prioritized is determined in advance, and the power supply control unit 27a has a higher priority. Power may be supplied in order from the side.
- the control information detection unit 24, the power supply control unit 27, 27a, and the data storage unit 26 of the power receiving side optical communication devices 20 and 20a in the above-described 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 by a computer system and executed.
- the term "computer system” as used herein includes hardware such as an OS and peripheral devices.
- the "computer-readable recording medium” refers to a portable medium such as a flexible disk, a magneto-optical disk, a ROM, or a CD-ROM, and a storage device such as a hard disk built in a computer system.
- a "computer-readable recording medium” is a communication line for transmitting a program via a network such as the Internet or a communication line such as a telephone line, and dynamically holds the program for a short period of time. It may also include a program that holds a program for a certain period of time, such as a volatile memory inside a computer system that is a server or a client in that case. Further, the above program may be for realizing a part of the above-mentioned functions, and may be further realized for realizing the above-mentioned functions in combination with a program already recorded in the computer system. It may be realized by using a programmable logic device such as FPGA (Field Programmable Gate Array).
- FPGA Field Programmable Gate Array
- Optical power supply system 10 ... Power supply side optical communication device, 11 ... Data transmission / reception unit, 12 ... Optical power supply unit, 13 ... Data control unit, 20 ... Power receiving side optical communication device, 21 ... Optical transmission / reception unit, 22 ... Optical power reception unit Unit, 23 ... Power storage unit, 24 ... Control information detection unit, 25 ... External transmission / reception unit, 26 ... Data storage unit, 27 ... Power supply control unit, 30, 31 ... Optical fiber, 40 ... External device
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Abstract
Description
以下、本発明の実施形態について図面を参照して説明する。図1は、第1の実施形態における光給電システム1の構成を示すブロック図である。光給電システム1は、給電側光通信装置10と、受電側光通信装置20と、外部装置40と、給電側光通信装置10と受電側光通信装置20とを接続する2つの光ファイバ30,31とを備える。
図2は、受電側光通信装置20の動作を示したフローチャートであり、当該フローチャートを参照しつつ、光給電システム1における電力供給処理について説明する。
第1の実施形態の光給電システム1では、光送受信部21においてデータを送信する構成と、データを受信する構成とを一体として備えていた。外部送受信部25においてデータを送信する構成と、データを受信する構成とを一体として備えていた。そのため、例えば、光送受信部21において、送信するデータが存在しているが、受信するデータが存在していない場合、または、受信するデータが存在するが、送信するデータが存在していない場合であっても、電源制御部27は、光送受信部21に対して起動及び動作に必要な電力を供給する必要があった。外部送受信部25において、送信するデータが存在しているが、受信するデータが存在していない場合、または、受信するデータが存在するが、送信するデータが存在していない場合であっても、電源制御部27は、外部送受信部25に対して起動及び動作に必要な電力を供給する必要があった。
図4は、受電側光通信装置20aの動作を示したフローチャートであり、当該フローチャートを参照しつつ、光給電システム1aにおける電力供給処理について説明する。
Claims (8)
- 給電用の光信号を送信する光給電部と、
データの光信号を送受信するデータ送受信部と、
前記データ送受信部が送受信するデータの送受信に関するデータ送受信制御情報を前記給電用の光信号に対して重畳するデータ制御部と、
を有する給電側光通信装置と、
前記光給電部が送信する前記給電用の光信号より得られる電力を蓄電する蓄電部と、
前記給電用の光信号に重畳されている前記データ送受信制御情報を検出する制御情報検出部と、
前記データ送受信部との間で前記データの光信号を送受信する光送受信部と、
外部装置との間で前記データを送受信する外部送受信部と、
前記給電側光通信装置、または、前記外部装置に送信されなかったデータを記憶するデータ記憶部と、
前記制御情報検出部が検出した前記データ送受信制御情報と、前記データ記憶部が記憶するデータとに基づいて、前記光送受信部及び前記外部送受信部における前記データの送信と受信の有無を検出し、検出した前記データの送信と受信の有無にしたがって、前記光送受信部、または、前記外部送受信部に対して前記蓄電部が蓄電する電力を供給する電源制御部と、
を有する受電側光通信装置と、
を備える光給電システム。 - 前記光送受信部は、
光送信部と、光受信部とを備えており、
前記外部送受信部は、
外部送信部と、外部受信部とを備えており、
前記電源制御部は、
前記データ送受信制御情報と、前記データ記憶部が記憶するデータとに基づいて、前記光送信部及び前記外部送信部における前記データの送信の有無と、前記光受信部における前記データの受信の有無を検出し、検出した前記データの送信と受信の有無にしたがって、前記光送信部、または、前記光受信部、または、前記外部送信部、または、前記外部受信部に対して前記蓄電部が蓄電する電力を供給する、
請求項1に記載の光給電システム。 - 前記データ送受信制御情報には、前記給電側光通信装置が前記受電側光通信装置に送信する予定であるデータのデータ量を示す送信予定データ量と、前記給電側光通信装置が前記受電側光通信装置から受信することができるデータのデータ量を示す受信可能データ量とが含まれており、
前記電源制御部は、
前記データ記憶部が記憶する前記受電側光通信装置から前記給電側光通信装置に対して送信される上り方向のデータと、前記受信可能データ量とに基づいて前記光送受信部が送信するデータの有無を検出し、前記送信予定データ量に基づいて前記光送受信部が受信するデータの有無を検出し、前記データ記憶部が記憶する前記受電側光通信装置から前記外部装置に対して送信される下り方向のデータと、前記送信予定データ量とに基づいて前記外部送受信部が送信するデータの有無を検出し、前記外部装置から送信される前記外部装置が送信する予定のデータ量に基づいて、前記外部送受信部が受信するデータの有無を検出する、
請求項1又は2に記載の光給電システム。 - 前記データ送受信制御情報には、前記給電側光通信装置がデータを送受信するタイミングを示す送受信タイミング情報が含まれており、
前記電源制御部は、
送信するデータが存在する場合、前記送受信タイミング情報が示す前記給電側光通信装置が受信可能になるタイミングにおいて、前記光送受信部に電力を供給するか、または、前記光送受信部が光送信部と光受信部とを備えている場合、前記光送信部に電力を供給し、前記光送受信部が受信するデータが存在する場合、前記送受信タイミング情報が示す前記給電側光通信装置の送信予定のタイミングにおいて、前記光送受信部に電力を供給するか、または、前記光送受信部が光送信部と光受信部とを備えている場合、前記光受信部に電力を供給する、
請求項1から3のいずれか一項に記載の光給電システム。 - 前記電源制御部は、
前記データの有無を検出する際に、前記データが無いことを検出した場合、前記データが無いことを検出した前記光送受信部、または、前記外部送受信部に対して電力の供給を行わず、前記光送受信部が、光送信部と光受信部を備えており、かつ前記外部送受信部が外部送信部と外部受信部を備えている場合、前記データが無いことを検出した前記光送信部、または、前記光受信部、または、前記外部送信部、または、前記外部受信部に対して電力の供給を行わない、
請求項1から4のいずれか一項に記載の光給電システム。 - 前記データ記憶部に替えて、前記受電側光通信装置の外部に備えられ、前記受電側光通信装置に接続するデータ記憶装置
を備える請求項1から5のいずれか一項に記載の光給電システム。 - 給電用の光信号を送信する光給電部と、データの光信号を送受信するデータ送受信部と、前記データ送受信部が送受信するデータの送受信に関するデータ送受信制御情報を前記給電用の光信号に対して重畳するデータ制御部と、を備える給電側光通信装置に接続する受電側光通信装置であって、
前記給電用の光信号より得られる電力を蓄電する蓄電部と、
前記給電用の光信号に重畳されている前記データ送受信制御情報を検出する制御情報検出部と、
前記データ送受信部との間で前記データの光信号を送受信する光送受信部と、
外部装置との間で前記データを送受信する外部送受信部と、
前記給電側光通信装置、または、前記外部装置に送信されなかったデータを記憶するデータ記憶部と、
前記制御情報検出部が検出した前記データ送受信制御情報と、前記データ記憶部が記憶するデータとに基づいて、前記光送受信部及び前記外部送受信部における前記データの送信と受信の有無を検出し、検出した前記データの送信と受信の有無にしたがって、前記光送受信部、または、前記外部送受信部に対して前記蓄電部が蓄電する電力を供給する電源制御部と、
を備える受電側光通信装置。 - 給電側光通信装置と、受電側光通信装置とを備える光給電システムにおける電力供給方法であって、
前記給電側光通信装置が、前記受電側光通信装置に対して給電用の光信号により電力の供給を行い、
前記受電側光通信装置の蓄電部が、供給される前記電力を蓄電し、
前記給電側光通信装置のデータ送受信部と、前記受電側光通信装置の光送受信部とが、データの光信号を送受信し、
前記受電側光通信装置の外部送受信部と、外部装置とが、前記データを送受信し、
前記受電側光通信装置のデータ記憶部に、前記給電側光通信装置、または、前記外部装置に送信されなかったデータを記録し、
前記給電側光通信装置のデータ制御部が、前記データ送受信部が送受信するデータの送受信に関するデータ送受信制御情報を前記給電用の光信号に対して重畳し、
前記受電側光通信装置の制御情報検出部が、前記給電用の光信号に重畳されている前記データ送受信制御情報を検出し、
前記受電側光通信装置の電源制御部が、前記制御情報検出部が検出した前記データ送受信制御情報と、前記データ記憶部が記憶するデータとに基づいて、前記光送受信部及び前記外部送受信部における前記データの送信と受信の有無を検出し、検出した前記データの送信と受信の有無にしたがって、前記光送受信部、または、前記外部送受信部に対して前記蓄電部が蓄電する電力を供給する光給電システムにおける電力供給方法。
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