JP2002300110A - Light-power/signal supply device, and optical signal/ power multiplex transmission system utilizing the device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a light-power/signal supply device that efficiently separates a power light and a signal light sent through one optical fiber, converts them into a power and an electric signal at a higher conversion rate than that of a conventional system and supplies them to an information device, and to provide an optical signal/power multiplex transmission system comprising a combination of the device and a loop optical fiber. SOLUTION: The light-power/signal supply device has an optical input port, a power output port and an electric signal output port. This device includes a lens that collimates the power light and the signal light with a wavelength different from that of the power light made incident form the optical input port, a wavelength selection mirror that separates the collimated light by the lens into the power light and the signal light, a photo diode that applies photoelectric conversion to the separated signal light to outputs the electric signal, and a single scanning carrier photo diode that applies highly efficient photoelectric conversion to the power light with high power and outputs a high power. Combining the device with the loop optical fiber can build up the optical signal/ power multiplex transmission system.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to transmitting power light and signal light having different wavelengths in the same optical fiber, converting the power light and signal light into electricity, and supplying the electricity to information equipment. Using a power / signal supply device that can convert an electric signal from an information device into an optical signal and send it to an optical fiber, and using the power / signal supply device,
The present invention relates to an optical signal / power multiplex transmission system for simultaneously multiplexing and transmitting signal light and power light having different wavelengths.

[0002]

2. Description of the Related Art Due to the IT revolution, the number of information devices and AV devices used in homes and offices is expected to increase sharply in the future. The supply of DC power for driving these devices is currently performed via a commercial power supply and an AC adapter. However, in this method, (1) the power supply efficiency is usually lower than 50%, (2) since the information line and the power line are individually provided, the information supply is cut off in the event of a disaster such as a power failure, and (3). Wiring is complicated, (4) Electromagnetic noise is easily mixed into copper wires, and (5) Copper ore, which is a raw material for copper wires, is expected to be depleted in the next 30 years. There are many problems in promoting IT, including:

On the other hand, a method of driving a device such as a sensor by using a high-power semiconductor laser, an optical fiber, and a photodiode and using electric power obtained by photoelectric conversion of the laser light is already known. , M.J.
Laundry, etc. (“Power-b
y-light systems and their components: an evaluatio
n ”, Appl. Opt. vol. 30, no. 9, pp. 1052? 1061, 1
991.). An optical signal transmission device that applies this method and performs bidirectional signal transmission while supplying power from one side with light has also been proposed (for example, Japanese Patent Application Laid-Open No. 8-13032).
No. 3, JP-A-8-321810, JP-A-8-321810
No. 331061, and Japanese Patent Application Laid-Open No. 9-106493).

[0004] However, these conventional techniques have the following disadvantages. (1) Since a normal photoelectric conversion element having a photodiode structure of pn or pin is used, when the optical power increases, the photocurrent is saturated, and thus the output voltage is also saturated. It is worse and the main cause is that the energy supply efficiency of the whole system is low at less than 10%. (2) Since the power light and the signal light have the same wavelength, the DC component and the AC component are electrically separated after photoelectric conversion, and the DC component is extracted as power and the AC component is extracted as a signal. In this case, the power loss due to the electric filter is large. (3) When there are a large number of information devices that require a large amount of information signals in the same network, it is difficult to transmit and receive signals between those devices, and furthermore, to transmit and receive signals between a plurality of networks.

[0005]

SUMMARY OF THE INVENTION Accordingly, the present inventors have
As a result of intensive studies to solve the problems of the prior art, power light and signal light having different wavelengths from each other are sent through one optical fiber, and the two types of light are split and each is photoelectrically converted. By efficiently converting power and electric signals, an optical power / signal supply device having excellent photoelectric conversion efficiency can be obtained, and by combining this device with a loop-shaped optical fiber, high efficiency can be obtained. The present inventors have found that the optical signal / power multiplex transmission system of the present invention can be used.

SUMMARY OF THE INVENTION Accordingly, a first object of the present invention is to provide an optical power / signal supply device capable of converting light energy into electric power with higher conversion efficiency than the conventional one and supplying it to information equipment. A second object of the present invention is to provide an optical power / signal supply device that efficiently separates signal light and power light from power light and signal light transmitted in one optical fiber and supplies the separated light to information equipment. To provide. A third object of the present invention is to provide an optical power / signal supply device incorporating a light-to-light conversion laser so that communication can be performed between a plurality of information devices. A fourth object of the present invention is to provide an optical fiber signal / power multiplex transmission system capable of multiplexing and transmitting a signal and power using the same optical fiber. A fifth object of the present invention is to provide an optical signal / power multiplex transmission system capable of sharing information between information devices and between networks while supplying power to a plurality of information devices. .

[0007]

SUMMARY OF THE INVENTION The above objects of the present invention are directed to an optical power and signal supply apparatus having an optical input port, a power output port, and an electrical signal output port, wherein the optical power is input from the optical input port. A lens that converts power light and signal light having a wavelength different from the power light into parallel light, a wavelength selection mirror that divides the light converted into parallel light by the lens into power light and signal light, and photoelectrically separates the separated signal light. It is characterized by having a photodiode capable of converting and outputting as an electric signal, and a single traveling carrier photodiode having a high saturation voltage capable of efficiently performing photoelectric conversion on high-power light and outputting high power. This is achieved by an optical power / signal supply device and an optical signal / power multiplex transmission system using the same.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to the drawings. FIG. 1 is a conceptual diagram of an optical power / signal supply device 10 according to the present invention corresponding to claim 1. The symbol 1 in the figure is
A lens for inputting the power light and the signal light having different wavelengths from the optical input port 5 to be parallel light, a wavelength selection mirror for transmitting the power light with low loss and reflecting the signal light with low loss; Reference numeral 3 denotes a photodiode for converting signal light into an electric signal, and reference numeral 4 denotes a single traveling carrier photodiode.

Since the wavelength selection mirror 2 has a small light loss, the efficiency of supplying light to the photodiode 3 and the single traveling carrier photodiode 4 is high. In addition, since the single traveling carrier photodiode 4 has a high saturation current value and a high saturation voltage value, high-power light can be photoelectrically converted with high efficiency. Further, in order to supply stable electric power, a storage battery 8 may be connected after the single traveling carrier photodiode as shown in FIG.

The output after photoelectric conversion in the present apparatus is supplied to an information terminal via a lead wire with a plug-in type as shown in FIG. 3, for example. In conventional information transmission, the plug for information and the outlet for supplying power were separate, so wiring became complicated.However, in the optical power / signal supply device of the present invention, power of different wavelengths was transmitted through the optical fiber. Light and signal light are propagated, and these are photoelectrically converted into electric power and electric signals by an optical power / signal supply device, so that electric power and information can be supplied to the information terminal with one line. The advantage that arises.

The optical power / signal supply device 10 of the present invention is shown in FIG.
As shown in FIG. 2, a laser diode 9 for converting an electric signal into an optical signal may be provided together with the port 11 for inputting an electric signal from the outside. By doing so, it is possible to receive an electric signal from a plurality of terminals, convert the electric signal into an optical signal, and transmit it as an optical signal to the outside. This allows high quality transmission with little noise. Also in the case of the present embodiment, it goes without saying that a storage battery may be connected after the single traveling carrier photodiode. FIG.
FIG. 2 is a conceptual diagram of an embodiment of the present apparatus, and a signal transmitted from an information terminal is also sent to an optical power / signal supply device via a conductor and a plug. This is converted into an optical signal by a semiconductor laser built in the optical power / signal supply device, and then emitted through an optical fiber.

FIG. 6 shows an optical power / signal supply device 1 according to the present invention.
FIG. 1 is a conceptual diagram of an optical signal / power multiplex transmission system of the present invention in which a zero and a loop optical fiber 20 are combined. In the figure, reference numeral 11 denotes a branch waveguide for introducing outgoing signal light from the optical power / signal supply device 10 of the present invention into the loop-shaped optical fiber 20;
Branch waveguides for extracting parts, reference numeral 13 is a high power semiconductor laser for powering light of wavelength lambda _1, reference numeral 14 denotes an optical fiber for propagating a laser beam to the multiplexer A, reference numeral 1
5 is a multiplexer A that introduces laser light into the loop-shaped optical fiber and forms a part of the loop, and 30 is a terminal device that is electrically connected to the optical power / signal supply device 10 of the present invention. .

[0013] In this system, after the high output semiconductor laser 13 laser beam emitted wavelength lambda ₁ from was introduced into a loop shaped optical fiber 20, converted into electric power by the optical power and signal supply apparatus 10 of the present invention Then, it is supplied to each terminal device 30 to operate each terminal device 30.
A signal from a certain terminal device 30 is converted into an optical signal having a wavelength λ ₂ different from λ ₁ by the optical power / signal supply device 10 of the present invention, introduced into the loop optical fiber 20, and transmitted to another terminal device 30. Sent. As a result, data can be transmitted and received between terminals connected to the loop optical fiber. As shown in FIG. 7, a solar cell 16 and a storage battery 8 may be used in combination as a power source for a high-power semiconductor laser. Also, as a loop optical fiber,
By using a multimode fiber having a large core diameter, the scale of the optical signal / power multiplex transmission system of the present invention can be increased.

A multiplexer B for introducing signal light from outside the loop into the loop optical fiber in the above system.
(17) By arranging the duplexer (18) for emitting signal light from inside the loop to outside the loop, data transmission and reception are not limited to within the loop, and data transmission and reception can be performed outside the loop. Therefore, the scale of the optical signal / power multiplex transmission system of the present invention can be further expanded (FIG. 8).
reference). Also in this case, the solar cell 16 and the storage battery 8 can be used in combination as a power source for the high-power semiconductor laser 13 (see FIG. 9).

The optical signal of the present invention shown in FIG.
In the power multiplex transmission system, it is preferable to use the multiplexer A shown in FIG.
Code 1-1 in the figure, emitted from the optical input port, the wavelength lambda ₁ of the power light and the signal light due to a terminal of a wavelength lambda ₂ of the loop (λ ₁ ≠ λ ₂₎ together lens into parallel light And
Reference numeral 1-2 denotes a condensing lens for allowing light transmitted through the wavelength selection mirror 2 or parallel light reflected by the mirror to enter the loop optical fiber from the multiplexer A, and reference numeral 1-3 denotes a terminal in the loop. a lens for collimating rays of the signal light of the wavelength lambda ₂ due to. The lenses 1-1, 1-2, and 1-3 may be the same lens or different lenses as long as they have such an effect. It is preferable that the characteristics of the wavelength selection mirror used in the multiplexer A are as shown in FIG.

The multiplexer A in the embodiment of FIG. 8 or FIG.
As shown in FIG. 12, in addition to the wavelength lambda ₂ of the signal light due to terminals in the wavelength lambda ₁ of the power light and loop, it is necessary to process even the signal light of the wavelength lambda ₃ due to an external signal is there. Here, λ ₁ , λ ₂ and λ ₃ are different wavelengths. In this case, the characteristics of the wavelength selection mirror in the multiplexer A are preferably as shown in FIG. Also,
The multiplexer B has the same configuration as the multiplexer A in FIG. 12, as shown in FIG. 14, but the characteristics of the wavelength selection mirror used in the multiplexer B in this case are shown in FIG. It is preferable that it is such.

FIG. 16 shows an example of the structure of the duplexer used in the present invention.
As shown in FIG. The characteristics of the wavelength selection mirror in this case are shown in FIG. As is clear from FIGS. 14 to 17, the multiplexer B and the demultiplexer can have substantially the same configuration except that the input port and the output port of the light are reversed.

FIG. 18 is a conceptual diagram showing an example in which the optical fiber power / signal multiplex transmission system of the present invention is applied to a building. The high-power semiconductor laser in the figure operates with power from a power line. High output power light with a wavelength lambda ₁ to be supplied from the semiconductor laser is introduced via the multiplexer A in the optical fiber loop run throughout the inside of the building. By making the optical fiber a multi-mode optical fiber having a large core diameter, the optical power per unit cross-sectional area can be reduced. This can prevent the backscattering phenomenon that occurs when the optical power per unit sectional area is high and limits the transmission power.

Also, since the length of the optical fiber loop is on the order of several kilometers, even a multimode optical fiber has a Gbit length.
/ s signal can be transmitted. The branching waveguide attached to each point of the optical fiber and the optical power / information supply device of the present invention configured as shown in FIG. 5 enable power supply to information devices and transmission and reception of information between the information devices. ing. The multiplexer A has a configuration as shown in FIG. 10, and a wavelength selection mirror used for the multiplexer A has a wavelength λ ₁ of the power light output from the optical power / information supply device as shown in FIG. while the reflectance is approximately 1, the reflectivity for the wavelength lambda ₂ of the signal light is substantially 0 in transmittance is approximately 1
It is.

A battery support may be provided between the power line and the high power semiconductor laser. Thus, even if the power line becomes unavailable due to an accident such as a power failure, the laser can be driven stably. In addition, when the loop optical fiber and the optical power / information supply device are connected to each other and the branching ratio of the branch waveguide for introducing light into the device is N, the number of connected optical power / information supply devices is N. Is, for example, N: 1, (N-
1): 1, (N-2): 1. . . The branching ratio is 1: 1. By doing so, power light having a power substantially equal to 1 / N of the light source power is supplied to any optical power / information supply outlet. The branch ratio of the branch waveguide that supplies signal light from the optical power / information supply device to the loop-shaped optical fiber is, for example, 10: 1. In this case, the branch waveguide is directed from the side of the narrowly branched waveguide to the thick waveguide. To send light,
Almost all signal light power is introduced into the looped optical fiber.

The optical power / information supply device can be connected not only to an information terminal or the like, but also to various sensors. For example, if a smoke sensor or the like is used, a fire detection network in a building is constructed. By configuring the system in this way, not only can communication be performed between a plurality of information devices, but also it is possible to multiplex and transmit signals and power using one optical fiber. Further, in this system, as shown in FIG. 19, a solar cell and a storage battery can be used in combination instead of the power line.

FIG. 19 shows an example in which the optical power / signal multiplex transmission system provided in a building exchanges data with the outside. In this system, power light from a high-power semiconductor laser is supplied to an optical fiber via a multiplexer A. The optical fiber is looped around the building in a loop, and the power light and the signal light go around in the loop. Therefore, information is shared between all devices connected to the optical fiber loop. Fig. 1 shows the multiplexer A
As shown in FIG. 2, it is composed of a wavelength selection mirror and a lens. As shown in FIG. 13, the wavelength selection mirror has a reflectance of almost 1 for the wavelength λ _{1 of the} power light, but has a reflectance of almost 0 for the wavelengths λ ₂ and λ _{3 of the} signal light. At the same time, the transmittance becomes almost 1. Therefore, light from a low-loss, high-power semiconductor laser can be introduced into the multimode optical fiber. The multimode optical fiber is formed in a loop shape and connects optical power / information supply devices.
When the number of optical power / information supply devices to be connected is N, the branching ratio of the branch waveguides for introducing light into these devices is, for example, N: 1, (N
-1): 1, (N-2): 1. . . The branching ratio is 1: 1. By doing so, power light of approximately 1 / N of the light source power is equally supplied to all optical power / information supply outlets. The branch ratio of the branch waveguide that supplies signal light from the optical power / information supply device to the loop-shaped optical fiber is, for example, 10: 1. In this case, the branch waveguide is directed from the side of the narrowly branched waveguide to the thick waveguide. As a result, almost all of the signal light power is introduced into the loop-shaped optical fiber.

Through the optical power / information supply device of the present invention, the power light having the wavelength λ ₁ is photoelectrically converted and guided to the power supply circuit of the information device, while the information light having the wavelengths λ ₂ and λ ₃ is photoelectrically converted.
It is led to the receiving circuit of the external device. The electrical signal from the information device from the optical power and information supply apparatus is output after being converted into the wavelength lambda ₃ of the information signal light. On the other hand, the optical signal from the outside of the wavelength λ ₂ is supplied into the optical fiber loop by the multiplexer B. As shown in FIG. 14, the multiplexer B includes a wavelength selection mirror and a lens. Here the wavelength selective mirror that is used in, as shown in FIG. 15, the wavelength lambda ₂ in example reflectance is 1, transmission at a wavelength lambda _1, wavelength lambda ₁ with regarded to lambda ₃ In example approximately 0, lambda ₃ The rate is almost one.

Therefore, the information signal light from the outside of the wavelength λ ₂ is supplied to the optical fiber loop with little loss. Further, the information light having the wavelength λ ₃ can be sent to the outside by the splitter 18. As shown in FIG. 16, the duplexer includes a wavelength selection mirror and a lens. As shown in FIG. 17, the wavelength selection mirror used here has, for example, a reflectance of approximately 1 and a transmittance of approximately 0 at wavelength λ _3.
Thus, at the wavelengths λ ₁ and λ ₂ , for example, the reflectance can be regarded as approximately 0 and the transmittance is approximately 1. Therefore, the information signal light of wavelength λ ₃ is emitted to the outside from the optical fiber loop with little loss. With this system, information can be shared between each information device and with an external network while supplying power to a plurality of information devices.

[0024]

The present invention will be described in more detail with reference to the following examples. As shown in FIG. 20, a light source having a wavelength λ ₁ = 1.47 μm and an output of 1 W was used as a power light source, and a light source having a wavelength λ ₂ = 1.55 μm and an output of 10 mW was used as a signal light source. Light emitted from each laser is multiplexed by a wavelength selection mirror and passes through an objective lens with a core diameter of 50 μm, a cladding diameter of 125 μm, and a total length of 100 m.
Was injected into a multimode optical fiber. An output from the optical fiber which is the parallel light by the objective lens, transmitted through the wavelength .lambda.1, separated by a wavelength selective mirror reflecting the wavelength lambda _2, respectively single traveling carrier photodiode, which is fed to the photodiode. The optical loss in the optical fiber was almost negligible, the photoelectric conversion efficiency of the single traveling carrier photodiode was about 50%, and the signal from the signal generator could be reproduced by the photodiode.

[0025]

Since the present invention is configured as described above in detail, it has the following effects. (1) It is possible to provide an optical power / signal supply device which converts light energy into electric power with higher conversion efficiency than conventional ones and supplies the electric power to information equipment. (2) Optical power and power that are efficiently separated from the power light and signal light that are transmitted as an
A signal supply device can be provided. (3) By providing an optical power / signal supply device incorporating a light-to-light conversion laser, communication between a plurality of information devices becomes possible. (4) Signals and power can be multiplexed and transmitted using the same optical fiber. (5) It becomes possible to share information between information devices and between networks while supplying power to a plurality of information devices using optical fibers. (6) The system configuration is simplified.

[Brief description of the drawings]

FIG. 1 is a principle diagram of an optical power / signal supply device of the present invention.

FIG. 2 is a principle diagram of an optical power / signal supply device of the present invention in which a storage battery is connected to a single traveling carrier photodiode.

FIG. 3 is a conceptual diagram illustrating an embodiment of an optical power / signal supply device of the present invention.

FIG. 4 is a principle diagram of the optical power / signal supply device of the present invention, which has a function of receiving an electric signal from the outside and emitting the same as an optical signal.

FIG. 5 is a conceptual diagram illustrating an embodiment of the optical power / signal supply device of the present invention having the configuration of FIG.

FIG. 6 is a principle diagram showing an example of an optical signal / power multiplex transmission system of the present invention.

FIG. 7 is a principle diagram showing an example of an optical signal / power multiplex transmission system of the present invention using a combination of a solar cell and a storage battery as a power source of a high-power semiconductor laser.

FIG. 8 is a principle diagram showing an example of an optical signal / power multiplex transmission system of the present invention which can exchange signals with the outside.

FIG. 9 is a principle diagram showing an example of an optical signal / power multiplex transmission system according to the present invention, which is capable of exchanging signals with the outside using a combination of a solar cell and a storage battery as a power source of a high-power semiconductor laser.

FIG. 10 is a principle diagram of a multiplexer A used in the present invention.

FIG. 11 is a characteristic diagram of a wavelength selection mirror used in the multiplexer A.

FIG. 12 is a principle diagram of the multiplexer A when signals can be exchanged with the outside.

FIG. 13 is a characteristic diagram of a wavelength selection mirror used in the multiplexer A of FIG.

FIG. 14 is a principle diagram of a multiplexer B used in the present invention.

FIG. 15 is a characteristic diagram of a wavelength selection mirror used in the multiplexer B.

FIG. 16 is a principle diagram of a duplexer used in the present invention.

FIG. 17 is a characteristic diagram of a wavelength selection mirror used in a duplexer.

FIG. 18 is a conceptual diagram when the optical power / signal multiplex transmission system of the present invention is applied to a building.

FIG. 19 is a conceptual diagram in a case where the optical power / signal multiplex transmission system of the present invention capable of exchanging signals with the outside is applied to a building. In this case, the power of the high-power semiconductor laser is a combination of a solar cell panel and a battery support.

FIG. 20 is a conceptual diagram of an embodiment of an optical signal / power multiplex transmission system of the present invention.

[Explanation of symbols]

 1. Optical lens 2. 2. Wavelength selection mirror Photodiode 4. 4. Uni-traveling carrier photodiode Optical input port 6. Power output port 7. 7. Electric signal output port Storage battery 9. Laser diode 10. 10. Optical power / signal supply device of the present invention Branch waveguide 12. Branch waveguide 13. High power semiconductor laser 14. Optical fiber 15. Multiplexer A 16. Solar cell 17. Combiner B 18. Demultiplexer 20. Loop optical fiber 30. Terminal device

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Yosuke Tanaka 2-24-16 Nakamachi, Koganei-shi, Tokyo Faculty of Engineering, Tokyo University of Agriculture and Technology (72) Inventor Takashi Kurokawa 2-24-16 Nakamachi, Koganei-shi, Tokyo Faculty of Engineering, Tokyo University of Agriculture and Technology F Term (reference) 5F049 MA01 NA20 NB01 RA07 RA10 TA12 TA14 UA17 UA20 5K002 BA13 BA16 DA02 FA02

Claims (13)

[Claims] 1. An optical power and signal supply device having an optical input port, a power output port, and an electric signal output port, wherein the power light incident from the optical input port and a signal having a wavelength different from the power light. A lens that converts light into parallel light,
A wavelength selection mirror that divides the light parallelized by the lens into power light and signal light, a photodiode that can photoelectrically convert the separated signal light and output it as an electric signal, and a high-power light. An optical power / signal supply device comprising: a single traveling carrier photodiode having a high saturation voltage capable of efficiently performing photoelectric conversion and outputting high power. 2. A single traveling carrier photodiode,
2. The optical power / signal supply device according to claim 1, further comprising a storage battery for storing electricity output from the photodiode, capable of storing power and supplying stable power at the same time. 3. An electric signal input port for receiving an external electric signal, and a laser diode for converting the electric signal received from the input port into an optical signal having a wavelength different from that of the power light. Claim 1 or 2
An optical power / signal supply device described in 1. 4. An optical fiber receiving port for receiving an external optical fiber, a socket-type optical fiber fixing device for fixing the received optical fiber with one touch, and parallelizing power light and signal light of different wavelengths supplied from the optical fiber. An optical lens that converts light into light, a wavelength selection mirror that separates parallel light collimated by the optical lens into power light and signal light by reflecting one and transmitting the other, and a single unit that converts power light into power A traveling carrier photodiode, a photodiode for converting signal light into an electric signal, and an outlet for the power and electric signal to be supplied to the terminal device on a surface different from the surface provided with the optical fiber receiving port. A socket type optical power / signal supply device characterized by the above-mentioned. 5. An outlet for the power and electric signals,
The socket-type optical power / signal supply device according to claim 4, wherein the socket-type optical power / signal supply device is configured to be a socket type that can be connected or separated with one-touch with power and electric signal intake means on the terminal device side. 6. An opening having receiving means for receiving an electric signal from a terminal device, a laser diode for converting the electric signal into an optical signal, and an external device capable of emitting the converted optical signal to an optical fiber. The socket type optical power / signal supply device according to claim 4 or 5, further comprising an optical signal output port having a socket type fixing means capable of fixing the optical fiber with one touch. 7. The socket type optical power / signal supply device according to claim 6, wherein the opening having a receiving means for receiving an electric signal from the terminal device is formed in a socket type. 8. The optical fibers constituting the loop, for introducing a wavelength lambda ₁ of the power light to the optical fiber, said optical fiber and coupler A and a high output which is connected via the other optical fiber A semiconductor laser, a branch waveguide for extracting a part of light from the optical fiber forming the loop, and at least one connected to the optical fiber via a branch waveguide for introducing the output signal light to the optical fiber forming the loop. 4. A set of the optical power / signal supply device according to claim 3, and an information device connected to the optical power / signal supply device on a one-to-one basis, and a power output port of the optical power / signal supply device. , An electric signal output port, an electric signal input port, and a power input port, an electric signal input port, and an electric signal output port of an information device connected to the optical power / signal supply device are connected to each other. And a signal / power multiplex transmission system. 9. The optical signal / power multiplex transmission system according to claim 8, wherein a storage battery charged by a solar cell is connected as a power supply to the high-power semiconductor laser. 10. The optical signal / power multiplex transmission system according to claim 8, wherein the optical fiber constituting the loop is a multimode optical fiber having a large core diameter. 11. has a multiplexer B demultiplexer capable of outputting a signal light lambda ₃ to the outside of the loop from the loop for introducing an external signal light having a wavelength lambda ₂ in a loop In addition, the claims 8 ~
10. The optical signal / power multiplex transmission system according to any one of 10 above. 12. The wavelength lambda ₁ of the multiplexer A for introducing the power light, the wavelength selection mirror that reflects the power light only the wavelength lambda _1, transmits said power light different wavelengths lambda ₂ of the signal light When,
The optical signal / power multiplex transmission according to any one of claims 8 to 11, comprising: a lens that converts the power light and the signal light into parallel light; and a lens that focuses the power light and the signal light on an optical fiber. system. 13. The multiplexer B has an external wavelength λ _2.
Reflects the signal light only, and the wavelength selection mirror which transmits the signal light of the wavelength lambda ₃ that is different from the signal light and the wavelength lambda ₁ of the power light, a lens for collimating light the power beam and a signal beam, and, wherein The optical signal according to claim 11, comprising a lens that focuses the power light and the signal light on the optical fiber.
Power multiplex transmission system.