JP2014042166A - Optical device and power supply system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an optical device and a power supply system that can perform energy transmission more effectively when optical power supply is performed.SOLUTION: An optical device 1 comprises a multi-core fiber (MCF) 16, a power supply light source 13 for generating power light used in optical communication, a probe light source 12 for generating probe light to monitor the state of the MCF 16, and a monitoring sensor 11 for monitoring the state of the MCF 16 by receiving return light returned in response to the probe light. The MCF 16 comprises a power light transmission core 16a which is optically connected with the power supply light source 13, and propagates the power light and a probe light transmission core 16b which is optically connected with the probe light source 12 and the monitoring sensor 11, and propagates the probe light.

Description

  The present invention relates to an optical device using an optical fiber and a power feeding system.

  In order to centrally observe predetermined information (for example, current value or voltage value) in a remote place, a measurement signal from a sensor disposed in a remote place is transmitted via an optical fiber, and the predetermined information is collected. Has been done. For example, Patent Document 1 proposes that power is supplied to a sensor used for measurement, a terminal device for optical communication, or the like via an optical fiber.

Japanese Patent No. 4641787

  Incidentally, since there is no technique for monitoring the state of the optical fiber in the optical power feeding system as described above, development of such a technique is desired. In addition, since this optical power feeding system uses a single core fiber, it is necessary to perform high energy transmission using a single core that transmits communication light, and the fiber connection portion is damaged by high power energy transmission. There was a case. In addition, in consideration of optical communication and the like, the capacity of energy to be transmitted has to be limited.

  SUMMARY An advantage of some aspects of the invention is that it provides an optical device and a power feeding system that can more effectively transmit energy when performing optical power feeding.

  An optical device according to the present invention includes an optical fiber having a plurality of cores, a power light source that emits power light used for optical communication or optical processing, a probe light source that emits probe light for monitoring the state of the optical fiber, and a probe A monitoring sensor that receives a return light with respect to the light and monitors the state of the optical fiber, and the plurality of cores are optically connected to the power light source and propagate the power light, and a probe light source And a probe light transmission core optically connected to the monitoring sensor and propagating the probe light.

  In this optical device, a plurality of cores of an optical fiber have a power light transmission core and a probe light transmission core. Therefore, the power light necessary for optical communication or optical processing and the probe light for monitoring can be transmitted through the same optical fiber, and optical power can be supplied while monitoring the state of the optical fiber. Energy can be transmitted more effectively when power is supplied.

  Further, in this optical device, the probe light transmission core is provided with return light generation means for generating return light having a predetermined wavelength with respect to the probe light, and the monitoring sensor returns the return light from the return light generation means. Is received and the state of the optical fiber is monitored. In this case, since the state of the optical fiber is monitored using the state of the return light from the return light generation means, unlike the conventional method using light leakage from the optical fiber, the light in the power transmission path It is possible to reliably avoid a situation in which loss or interference occurs and improve the accuracy of monitoring.

  In the optical device according to the present invention, the return light generation means is disposed at both ends of the probe light transmission core of the optical fiber, and the monitoring sensor is based on the spectrum of the return light output from the return light generation means. The temperature at both ends of the optical fiber may be monitored. In this case, it is possible to reliably detect the state of both end portions of the optical fiber in which an event such as light leakage or temperature rise is likely to occur.

  In the optical device according to the present invention, the wavelength of the return light from the return light generation means disposed at one end of the probe light transmission core and the return from the return light generation means disposed at the other end of the probe light transmission core The wavelength of light may be different. In this case, the return light from one end and the return light from the other end can be discriminated, and temperature changes at one end and the other end of the optical fiber can be detected independently of each other. The location can be detected more reliably.

  The optical device according to the present invention may further include a branching portion for branching the optical fiber so as to be optically connectable with the single-core fiber, and the output end of the optical fiber from the power transmission core is provided at the output end of the optical fiber. A combining unit that combines and emits the incident light may be provided.

  In the optical device according to the present invention, the probe light transmission core may be disposed on the central axis of the optical fiber. In this case, since the probe light transmission core is provided at a position where the temperature change state is easily transmitted, the accuracy of optical fiber monitoring can be further improved.

  The power supply system according to the present invention includes the above-described optical device and photoelectric conversion that is connected to the optical device via a single-core fiber and converts light supplied from the optical device via the single-core fiber to electricity. And a power supply line that transmits electricity photoelectrically converted by the photoelectric conversion unit to a power supply target device.

  In the power supply system described above, similarly to the above, the plurality of cores of the optical fiber have a power light transmission core and a probe light transmission core. Therefore, the power light necessary for optical communication and the probe light for monitoring can be easily made compatible, and optical power feeding can be performed while monitoring the state of the optical fiber. Energy can be transmitted more effectively.

  ADVANTAGE OF THE INVENTION According to this invention, the optical apparatus and electric power feeding system which can transmit energy more effectively when performing optical electric power feeding can be provided.

It is a figure which shows an example of the optical apparatus and electric power feeding system which concern on this embodiment. It is a figure which shows an example of the multiplexing apparatus used for the optical apparatus shown in FIG. It is a figure which shows the cross section of the multi-core fiber used for the optical apparatus shown in FIG. It is a graph which shows the wavelength spectrum of the light which the monitoring sensor of the optical apparatus shown in FIG. 1 light-receives. It is a figure which shows an example of the branching device used for the optical apparatus shown in FIG. It is a figure which shows the optical apparatus and electric power feeding system which concern on a modification. It is a figure which shows the optical apparatus which concerns on a modification.

  Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the description, the same reference numerals are used for the same elements or elements having the same function, and redundant description is omitted.

  First, the optical device 1 according to the present embodiment and the power supply system 100 including the optical device 1 will be described with reference to FIGS.

  As shown in FIG. 1, the optical device 1 includes a monitoring sensor 11, a probe light source 12, a feeding light source 13, a circulator 14, a multiplexing device 15, a multi-core fiber 16 (hereinafter referred to as “MCF 16”), and a fiber grating 17 (hereinafter referred to as “optical fiber”). (Referred to as “FBG17”), demultiplexer 18, single core fibers 19a, 19b, 19c, 19d (hereinafter referred to as “SCF 19a, 19b, 19c, 19d”), single core fibers 21a, 21b, 21e, 21f (hereinafter referred to as “FBG17”). SCF 21 a, 21 b, 21 e, 21 f ”) and a demultiplexer 22.

  The power supply system 100 has a function of photoelectrically converting light generated by the optical device 1 and supplying the light to a power supply target device. The optical device 1, the photoelectric conversion units 23a, 23b, and 23c, and the sensor devices 24a and 24b. , 24c and feeder lines 25a, 25b, 25c.

  The monitoring sensor 11 is a sensor for monitoring the state of the MCF 16 by receiving the return light of the probe light output by the probe light source 12 described later. For example, the monitoring sensor 11 receives the return light and monitors the temperature of the MCF 16 from the spectrum of the return light. The monitoring sensor 11 is connected to one end of the SCF 19a that is a single-core fiber, and the return light described above is incident on the monitoring sensor 11 through the SCF 19a. The monitoring of the MCF 16 of the monitoring sensor 11 will be described in detail later.

  The probe light source 12 emits probe light for monitoring the state of the MCF 16. The probe light source 12 is connected to one end of the SCF 19b, and the probe light generated by the probe light source 12 is incident on the circulator 14 via the SCF 19b.

  The power supply light source 13 is light for optical power supply executed by the power supply system 100 and is a power light source for generating light having a wavelength of 1.45 μm, for example. The power supply light source 13 includes, for example, a light emitting diode (LED) or a laser diode (LD). The power supply light source 13 outputs power light used for optical communication. The feeding light source 13 is connected to one end of two SCFs 19d and 19d, and the power light generated by the feeding light source 13 is incident on the multiplexer 15 via the SCFs 19d and 19d. The power light generated by the power supply light source 13 is, for example, about 1 mW to 1000 mW.

  The circulator 14 includes three ports and has a function of outputting incident light only to a predetermined port. The circulator 14 is connected to the other end of the SCF 19a, the other end of the SCF 19b, and one end of the SCF 19c. The circulator 14 outputs the light incident from the SCF 19b to the SCF 19c, and outputs the light incident from the SCF 19c to the SCF 19a.

  As shown in FIG. 2, the multiplexer 15 is an optical system (spatial separation optical system) for optically coupling the probe light output from the probe light source 12 and the power light output from the power supply light source 13 to the MCF 16. Device. The other end of the SCF 19c, the other ends of the two SCFs 19d and 19d, and one end of the MCF 16 are connected to the multiplexer 15. The multiplexer 15 receives the probe light of the probe light source 12 from the SCF 19c, receives the power light of the feeding light source 13 from the SCFs 19d and 19d, optically couples these lights, and emits them to the MCF 16. The multiplexer 15 also has a function of receiving return light from the MCF 16 and emitting the return light to the SCF 19c. Such a multiplexer 15 includes a first optical system S1 and a second optical system S2.

  The first optical system S1 is located on the SCF 19c, 19d, 19d side, and is composed of one condenser lens. The condensing lens of the first optical system S1 is disposed so as to face each of the SCFs 19c, 19d, 19d on the axis of the exit end of the SCFs 19c, 19d, 19d. The condensing lens of the first optical system S1 is disposed at a position away from the emission ends of the SCFs 19c, 19d, and 19d by a predetermined distance. The plurality of beams transmitted through the condenser lens are reduced in the beam interval toward the second optical system S2 and intersect once at the focal point. Thereafter, the beam interval is expanded again, and the second interval is increased. The light enters the optical system S2.

  The second optical system S2 is located on the MCF 16 side, and is composed of one condenser lens. The condenser lens of the second optical system S2 is disposed so as to face the MCF 16 on the axis of the incident end of the MCF 16. The condenser lens of the second optical system S2 is arranged at a position away from the incident end of the MCF 16 by the focal length of the condenser lens. Then, the second optical system S2 causes the plurality of lights L1, L2, and L2 transmitted through the condenser lens to enter the respective cores 16b, 16a, and 16a (see FIG. 3) of the MCF 16.

  The MCF 16 is a multi-core fiber that connects the multiplexing device 15 and the demultiplexing device 18 that are arranged apart from each other. As shown in FIG. 3, the MCF 16 includes two power light transmission cores 16a and 16a, a probe light transmission core 16b, and a clad 16e that covers the cores 16a, 16a, and 16b. The power light transmission core 16 a is optically connected to the power supply light source 13 and propagates power light from the power supply light source 13. The probe light transmission core 16b is a core different from the power light transmission cores 16a and 16a, and is optically connected to the monitoring sensor 11 and the probe light source 12, and propagates the probe light and its return light.

  As shown in FIG. 3A, the power light transmission cores 16a and 16a are arranged on the outer side in the radial direction so as to be located on a concentric circle with the central axis of the MCF 16 as the center. The transmission cores 16 a and 16 a are disposed at positions that are symmetrical with each other about the central axis of the MCF 16. The probe light transmission core 16 b is disposed at the center along the central axis of the MCF 16. Further, for example, the diameter of the clad 16e of the MCF 16 is about 125 μm, the diameter of the power light transmission core 16a is about 25 μm, and the diameter of the probe light transmission core 16b is about 10 μm. For example, the numerical aperture (NA) of the power optical transmission core 16a of the MCF 16 is about 0.2, and the numerical aperture (NA) of the probe optical transmission core 16b is about 0.12.

  Further, the wavelength of the light L1 (see FIG. 2) incident on the probe light transmission core 16b and the wavelength of the light L2 incident on the power light transmission core 16a are different from each other. The influence on the probe light by the power light transmitted by the core 16a is reduced. The power light transmission core 16a and the probe light transmission core 16b are arranged apart from each other so that the shortest separation distance (the distance between the closest positions in each core) is at least about 20 μm. Therefore, such an influence is further reduced.

  As described above, the MCF 16 has a plurality of cores. However, the arrangement of the cores of the MCF 16 is not limited to the above. For example, as shown in FIG. 3B, for communication that propagates communication light necessary for optical communication. The core 16c may be provided. Further, the power light transmission core 16a may not be provided as shown in FIGS. 3A and 3B, but may be provided as at least one.

  The FBG 17 has a periodic structure of a high refractive index portion and a low refractive index portion. When light is incident on the FBG 17, only light having a predetermined wavelength is reflected from the FBG 17 depending on the period of the periodic structure. . As shown in FIG. 1, the FBG 17 having such a function is provided at an end portion of the MCF 16 on the side of the demultiplexing device 18 (connection portion between the MCF 16 and the demultiplexing device 18). The FBG 17 is optically connected to the probe light transmission core 16 b and reflects the return light having a predetermined wavelength with respect to the probe light received from the probe light source 12. The wavelength spectrum of the return light by the FBG 17 has temperature dependence, and the wavelength of the return light changes depending on the temperature. Therefore, the monitoring sensor 11 can monitor the temperature of the end of the MCF 16 on the side of the branching device 18 by receiving the return light. Specifically, for example, as shown in FIG. 4, when the wavelength of the return light of the FBG 17 when the temperature is normal is λ1, a spectrum having a peak at λ1 is obtained in the normal time, whereas the temperature is When abnormal, the peak of λ1 shifts, for example, a spectrum having a peak at λ3 larger than λ1 is obtained. As described above, the monitoring sensor 11 monitors the temperature at the connection portion between the MCF 16 and the branching device 18 based on the spectrum of the return light from the FBG 17.

  The branching device 18 is a branching unit that branches the MCF 16 so as to be connectable to the SCFs 21a and 21b. As shown in FIG. 5, the demultiplexing device 18 is a device of a spatial separation optical system for separating the light emitted from the MCF 16 into SCFs 21 a and 21 b, and includes a third optical system S <b> 3 and a fourth optical system. S4. The other end of the MCF 16, one end of the SCF 21a, and one end of the SCF 21b are connected to the branching device 18.

  The third optical system S3 is located on the MCF 16 side, and is composed of one condenser lens. The condenser lens of the third optical system S3 is disposed so as to face the MCF 16 on the axis of the emission end of the MCF 16. The condenser lens of the third optical system S3 is disposed at a position away from the exit end of the MCF 16 by the focal length of the condenser lens. Then, the third optical system S3 has its beam interval reduced toward the fourth optical system S4 and intersects once at the focal point, and then the beam interval is expanded again to form the fourth optical system S4. Incident.

  The fourth optical system S4 is located on the SCF 21a, 21b side, and is composed of a single condenser lens. The condensing lens of the fourth optical system S4 is disposed so as to face each of the SCFs 21a and 21b on the axis of the incident end of the SCFs 21a and 21b. The condenser lens of the fourth optical system S4 is disposed at a position away from the incident ends of the SCFs 21a and 21b by a predetermined focal length. Then, the fourth optical system S4 deflects the plurality of beams transmitted through the condenser lens so as to be parallel to the optical axes of the cores of the SCFs 21a and 21b, and each of the parallel beams of the SCFs 21a and 21b. Incident on each core.

  As shown in FIG. 1, the branching device 22 is connected to the other end of the SCF 21a, one end of the SCF 21e, and one end of the SCF 21f. The demultiplexing device 22 is, for example, a beam splitter that divides an input beam into a plurality of beams having a predetermined intensity and outputs the beams. Therefore, the beam incident on the core of the SCF 21a reaches the demultiplexing device 22, is separated by the demultiplexing device 22, and the respective beams are incident on the cores of the SCFs 21e and 21f.

  The photoelectric conversion units 23a, 23b, and 23c receive the light generated by the optical device 1 as described above, convert the received light into electric power, and output it. The photoelectric conversion unit 23a is connected to the other end of the SCF 21e, the photoelectric conversion unit 23b is connected to the other end of the SCF 21f, and the photoelectric conversion unit 23c is connected to the other end of the SCF 21b. The photoelectric conversion unit 23a outputs the converted power to the sensor device 24a, the photoelectric conversion unit 23b outputs the converted power to the sensor device 24b, and the photoelectric conversion unit 23c outputs the converted power to the sensor device 24c. The photoelectric conversion units 23a, 23b, and 23c that operate in this way are configured by, for example, a photodiode (PD).

  The sensor devices 24a, 24b, and 24c are connected to the photoelectric conversion units 23a, 23b, and 23c through power supply lines 25a, 25b, and 25c, respectively. The sensor devices 24a, 24b, and 24c are, for example, power supply target devices of the power supply system 100 including a sensor for measuring a predetermined value (for example, a current value or a voltage value), a controller that controls the sensor, and the like. The sensor devices 24a, 24b, and 24c operate by receiving electric power converted by the photoelectric conversion units 23a, 23b, and 23c, respectively. The feeder lines 25a, 25b, and 25c are electric wires provided to transmit electricity photoelectrically converted by the photoelectric conversion units 23a, 23b, and 23c to the sensor devices 24a, 24b, and 24c, respectively.

  As described above, in the optical device 1 and the power feeding system 100 according to the present embodiment, the MCF 16 includes the power light transmission core 16a and the probe light transmission core 16b. The probe light can be transmitted through the same optical fiber, and the optical power can be fed while monitoring the state of the MCF 16. Thereby, the energy transmission at the time of performing optical power feeding can be performed more effectively.

  In addition, since the probe light transmission core 16b is disposed on the central axis of the MCF 16, the probe light transmission core 16b is provided at a position where the state of temperature change is easily transmitted, so that the monitoring accuracy of the MCF 16 is further improved. Can be improved.

  The probe light transmission core 16b is provided with an FBG 17 that generates return light having a predetermined wavelength with respect to the probe light. The monitoring sensor 11 receives the return light from the FBG 17 and monitors the state of the MCF 16. Therefore, unlike conventional methods that use light leakage from optical fibers, it is possible to reliably avoid situations in which light loss or interference occurs in the power transmission path and improve the accuracy of monitoring. . Further, the disconnection of the MCF 16 can also be detected by detecting that the return light from the FBG 17 has disappeared.

  Further, the FBG 17 is arranged at the end of the MCF 16 on the side of the demultiplexer 18, and the monitoring sensor 11 is based on the spectrum of the return light output from the FBG 17, at the end of the end of the MCF 16 on the side of the demultiplexer 18. Since the temperature is monitored, it is possible to reliably detect the state of the end of the MCF 16 where an event such as light leakage or a temperature rise is likely to occur.

  The present invention is not limited to the above embodiment, and various modifications can be applied. For example, in the above-described embodiment, the example in which the FBG 17 is arranged at the end of the MCF 16 on the side of the branching device 18 has been described, but the arrangement position of the FBG 17 is not limited to this example. For example, as shown in the optical device 1a and the power feeding system 100a according to the modification of FIG. 6, the FBG 27 having the same function as the FBG 17 may be arranged at the end of the MCF 16 on the side of the multiplexer 15 or FBG 17 The return light wavelength and the FBG 27 return light wavelength may be different from each other.

  Specifically, for example, as shown in FIG. 4, when the wavelength of the return light of the FBG 17 is λ1 and the wavelength of the return light of the FBG 27 is λ2 when the temperature is normal, the MCF 16 side of the multiplexer 15 When the temperature at the end of the optical filter and the end on the side of the demultiplexer 18 is normal, a spectrum having peaks at λ1 and λ2 is obtained, whereas the temperature at the end of the demultiplexer 18 on the MCF 16 is abnormal. Λ1 peak shifts, for example, a spectrum having a peak at λ3 is obtained, and when the temperature at the end of the MCF 16 on the side of the multiplexer 15 becomes abnormal, the λ2 peak shifts, for example, λ4 has a peak. A spectrum is obtained.

  In this way, the FBGs 17 and 27 are arranged at both ends of the probe light transmission core 16b of the MCF 16, and the monitoring sensor 11 sets the temperatures at both ends of the MCF 16 based on the spectrum of the return light output from the FBGs 17 and 27. In the case of monitoring, it is possible to more reliably detect the state of both ends of the MCF 16 where the above-described events such as light leakage and temperature rise are likely to occur.

  Further, as described above, when the wavelength of the return light from the FBG 17 is different from the wavelength of the return light from the FBG 27, the return light from one end of the MCF 16 can be distinguished from the return light from the other end. Since the temperature change at one end and the other end of each can be detected independently of each other, it is possible to more reliably detect the occurrence point of temperature rise or the like in the MCF 16.

  Moreover, although the said embodiment demonstrated the optical apparatus 1 provided with the multiplexing apparatus 15 and the demultiplexing apparatuses 18 and 22, the structure of the optical apparatus which concerns on this invention is not restricted to this example. For example, as shown in FIG. 7, a laser oscillator 31 that generates laser light used for optical processing, an MCF 32 that has the same configuration as the MCF 16 that functions as a light guide for laser light, an MCF 32, and a processing head 35 for performing laser processing. The present invention is also applied to an optical apparatus 30 that is a laser processing apparatus including a connector 33 that optically connects the optical axis and a condenser lens 36 that is a laser beam combining portion provided inside the processing head 35. Can do.

  In this optical device 30, the laser beam L 5 from the laser oscillator 31 is transmitted to the condenser lens 36 in the machining head 35 via the MCF 32, and the condenser lens 36 synthesizes the laser beam L 5 that is the emitted light from the MCF 32. Then, the workpiece W outside the machining head 35 is irradiated to process the workpiece W. Thus, when processing with the laser beam L5, the power of the light is high and damage may occur at the entrance and exit of the MCF 32, so it is desirable to monitor the state of the MCF 32. Therefore, as shown in FIG. 7, for example, if the FBG 34 having the same configuration as the FBGs 17 and 27 is provided at the end of the MCF 32 on the connector 33 side, the connector of the MCF 32 is the same as the optical device 1 and the power feeding system 100 described above. The state of the end portion on the 33 side can be monitored.

  In the above embodiment, an example in which the FBGs 17, 27, and 34 are used as return light generation means for generating return light has been described. However, it is possible to use a return light generation means other than the FBG. Specifically, for example, a multilayer filter or a fluorescent material can be used, and in this case, the same effect as in the above embodiment can be obtained. A multilayer filter is a filter configured by laminating a material with a high refractive index and a material with a low refractive index, and a fluorescent substance is a substance that absorbs excitation light and emits longer wavelength fluorescence. However, both have a function of generating return light having a predetermined wavelength.

  In the above-described embodiment, the example in which the multiplexing device 15 and the demultiplexing device 18 are configured to include the condensing lens has been described, but the configurations of the multiplexing device and the demultiplexing device are not limited to this example. That is, for example, a multiplexing device and a demultiplexing device may be configured by combining a lens, a mirror, and a filter.

  Moreover, although the photoelectric conversion part 23a, 23b, 23c, the sensor apparatus 24a, 24b, 24c, and the feed line 25a, 25b, 25c were each demonstrated in the said embodiment, the photoelectric conversion part, the sensor apparatus were demonstrated. The number of feeder lines can be changed as appropriate.

  DESCRIPTION OF SYMBOLS 1,30 ... Optical apparatus, 11 ... Monitoring sensor, 12 ... Probe light source, 13 ... Feed light source (power light source), 16 ... MCF (optical fiber), 16a ... Core for power light transmission, 16b ... Core for light transmission of probe, 17, 27, 34 ... FBG (return light generation means), 18 ... demultiplexing device (branching unit), 23a, 23b, 23c ... photoelectric conversion unit, 24a, 24b, 24c ... sensor devices (power supply target devices), 25a, 25b, 25c ... feed line, 36 ... condensing lens (combining unit), 100 ... feed system.

Claims (8)

An optical fiber having a plurality of cores;
A power light source that emits power light used for optical communication or optical processing;
A probe light source that emits probe light for monitoring the state of the optical fiber;
A monitoring sensor that receives return light with respect to the probe light and monitors the state of the optical fiber, and
The plurality of cores are optically connected to the power light source and propagate the power light, and a power light transmission core is optically connected to the probe light source and the monitoring sensor and propagates the probe light. An optical device comprising an optical transmission core. The probe light transmission core is provided with return light generating means for generating return light of a predetermined wavelength with respect to the probe light,
The optical apparatus according to claim 1, wherein the monitoring sensor receives a return light from the return light generation unit and monitors a state of the optical fiber. The return light generation means is disposed at both ends of the probe light transmission core of the optical fiber,
The optical device according to claim 2, wherein the monitoring sensor monitors temperatures at both ends of the optical fiber based on a spectrum of the return light output from the return light generation unit.   The wavelength of the return light from the return light generation means arranged at one end of the probe light transmission core, and the wavelength of the return light from the return light generation means arranged at the other end of the probe light transmission core The optical device according to claim 3, wherein are different from each other.   The optical device according to any one of claims 1 to 4, further comprising a branching portion that branches the optical fiber so as to be optically connectable to a single-core fiber.   The optical apparatus according to claim 1, wherein the probe light transmission core is disposed on a central axis of the optical fiber.   5. The optical device according to claim 1, wherein a synthesis unit that synthesizes and emits light emitted from the power light transmission core is provided at an emission end of the optical fiber. . The optical device according to any one of claims 1 to 6,
A photoelectric conversion unit that is connected to the optical device via a single-core fiber and converts light supplied from the optical device via the single-core fiber to electricity;
A power supply line for transmitting electricity photoelectrically converted by the photoelectric conversion unit to a power supply target device;
A power supply system comprising:

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