Contact information transmission system

Abstract

To provide a contact information transmission system capable of transmitting contact information by being stably operated to an electromagnetic interference such as lightning.SOLUTION: A contact information transmission system comprises: an SOG control device 10 that includes a first contact information output part 12 that outputs first contact information 11; and a local inner terminal device 20 that includes a second contact information output part 22 that outputs second contact information 21 on the basis of the first contact information. The SOG control device 10 comprises an optical signal conversion part 14 that converts the first contact information 11 into an optical signal 13, and outputs them. The optical signal 13 is transmitted to the local inner terminal device 20, and is input into the second contact information output part 22 after the conversion of them into an electric signal 26 by an optical reception signal 24. An optical wave 23 for supplying power is transmitted through an optical fiber 25 from a power supply light source 27 of the local inner terminal device 20, and the SOG control device 10 obtains a power for driving the optical signal conversion part 14 from an optical energy of the optical wave 23 for supplying power by a light reception element 16.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a contact information transmission system that converts contact information output from a terminal device placed outdoors or the like into an optical signal and transmits it to a terminal device installed in a remote location such as indoors.

Background Art

[0002] An air load switch of an outdoor commercial power receiving lead-in pole, that is, a PAS (Pole mounted Air Insulated Switch), and a SOG (Strage Overcurrent Ground) control device that controls the SOG operation attached thereto are installed at the boundary between a consumer side such as a business office and an electric power company, and are used to prevent spread accidents to other cases when a short-circuit accident or a ground fault accident occurs in the business office. For example, when a short circuit or overcurrent accident occurs in the business office, the PAS detects this and automatically locks the switch, and after temporarily cutting off the power supply by a circuit breaker on the electric power company side, the PAS operates the switch. In such an accident, the SOG control device outputs contact information in order to output an alarm, and the contact information is sent to a terminal device in the business office and used for control such as accident response. However, when lightning strikes or the like occurs, if a surge voltage or surge current is included in the contact information taken into the terminal device in the business office, it will cause malfunction or failure of the control device connected to the terminal device.

[0003] Generally, in order to cope with electromagnetic interference, lightning strikes, etc., an optical signal is used for information transmission, and an optical signal is also used for the transmission of contact information. Patent Document 1 and Patent Document 2 describe devices that convert a contact signal such as a relay into an optical signal and transmit it.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Patent Document 2

[0005] When transmitting contact information to terminal devices installed in remote locations, such as SOG control devices, transmitting the information via optical fiber to convert it into an optical signal offers greater resistance to interference from lightning strikes and other disruptions than transmitting it via electrical cables. Generally, converting contact information into an optical signal requires power to generate the optical signal, and in conventional transmission devices, this power is supplied from the power supply within the terminal. However, in the event of a major electromagnetic disturbance such as a lightning strike, the resulting surge voltage can enter the optical signal generation section from the power supply, disrupting its normal operation and potentially damaging the power supply. In particular, for SOG control devices that handle abnormal situations, it is essential to always transmit accurate contact information without delay to terminals within the business premises or office.

[0006] Therefore, the object of the present invention is to solve the above problems and provide a contact information transmission system that can operate stably even in the event of electromagnetic interference such as lightning strikes and enables the transmission of contact information. [Means for solving the problem]

[0007] To solve the above problems, in the first aspect, the contact information transmission system according to the present invention is a transmission system comprising a first terminal device having a first contact information output unit that outputs first contact information of open or short-circuited contacts, and a second terminal device having a second contact information output unit that outputs second contact information based on the first contact information transmitted from the first terminal device, wherein the first terminal device comprises an optical signal conversion unit that converts the first contact information into an optical signal and outputs it, the optical signal is transmitted to the second terminal device by an optical fiber, converted into an electrical signal and input to the second contact information output unit, and a power supply optical wave is sent from the second terminal device to the first terminal device through an optical fiber, and power is supplied to drive the optical signal conversion unit by the optical energy of the power supply optical wave.

[0008] As described above, in this invention, the power for the optical signal conversion unit, which converts contact information into optical signals, is obtained not from the power supply in the first terminal device, but from the optical energy of light waves sent from the second terminal device through an optical fiber. Therefore, the optical signal conversion unit is completely isolated from the power supply, and unlike conventional devices, if a large electromagnetic disturbance such as a lightning strike occurs, the resulting surge voltage can be prevented from entering the optical signal conversion unit from the power supply. This ensures the stable operation of the optical signal conversion unit and enables the transmission of contact information to the second terminal device without malfunction. Furthermore, compared to cases where a simple battery, solar cell, or a power supply combining them is used as the power source for the optical signal conversion unit, stable operation is possible because there is no need to monitor the charge level or replace the battery, and it is not affected by weather conditions. In addition, since an optical fiber is used as the transmission path for contact information, it is possible to prevent surge voltages that reach the first terminal device due to a lightning strike or the like from propagating to the second terminal device and damaging the second terminal device.

[0009] Here, the light source for power supply installed in the second terminal device can be a semiconductor laser, a light-emitting diode, or the like. The photo-receiving element, such as a photodiode installed in the first terminal device, receives the light wave and outputs a light wave of a wavelength and intensity capable of generating the voltage and current required by the optical signal conversion unit. For example, it can be selected and used from light sources commonly used in optical communication.

[0010] In a second aspect, the present invention is characterized in that, in the contact information transmission system according to the first aspect, the optical signal conversion unit comprises a light-emitting diode or a semiconductor laser, and generates and outputs the optical signal by controlling its drive current. The invention in this aspect generates an optical signal by controlling the drive current of a light-emitting diode or a semiconductor laser, which are the most common means of generating an optical signal. The simplest method is to create an optical signal by controlling the ON / OFF of the drive current in accordance with the opening / short circuit of the contact information, and various other means are possible, such as converting the contact information into an electrical signal and creating a digital or analog optical signal in accordance with the opening / short circuit of the contact information. Light-emitting diodes and semiconductor lasers for optical signal generation can be general light sources used for optical communication.

[0011] In a third aspect, the present invention is characterized in that, in the contact information transmission system according to the first aspect, the optical signal converter includes an optical switch that transmits or blocks an optical path by an electrical signal, and converts an optical wave sent from the second terminal device through an optical fiber into an optical signal by controlling the optical switch and outputs it. The invention in this aspect converts contact information into an electrical signal and controls the ON / OFF state of the optical switch by that electrical signal. Furthermore, in the invention in this aspect, the light source for the optical signal is installed in the second terminal device, and the optical wave sent from the second terminal device through an optical fiber is controlled ON / OFF by the optical switch to create an optical signal. This makes it possible to reduce the power required for the optical signal conversion unit. Here, various types of devices can be used as the optical switch, such as optical waveguide type, mechanical mechanism type, MEMS type, etc. For the light source for generating the optical signal installed in the second terminal device, a general light source for optical communication such as a light-emitting diode or semiconductor laser can be used.

[0012] In a fourth aspect, the present invention is characterized in that, in the contact information transmission system of the first aspect, the optical signal converter includes a variable optical attenuator that controls the transmission attenuation of an optical wave by an electrical signal, and converts an optical wave sent from the second terminal device through an optical fiber into an optical signal by controlling the variable optical attenuator and outputs it. The invention of this aspect converts contact information into an electrical signal and controls the variable optical attenuator by that electrical signal. In the invention of this aspect as well, the light source for the optical signal is installed in the second terminal device, and the optical wave sent from the second terminal device through an optical fiber is converted into an optical signal by controlling the transmission attenuation of the optical wave by controlling the variable optical attenuator. This makes it possible to reduce the power required for the optical signal conversion unit. Here, various types of devices can be used as the variable optical attenuator, such as optical waveguide type, mechanical mechanism type, MEMS type, etc. For the light source for generating the optical signal installed in the second terminal device, a general light source for optical communication such as a light-emitting diode or semiconductor laser can be used.

[0013] In a fifth aspect, the present invention is characterized in that, in the contact information transmission system according to the third aspect, a portion of the power supply light wave sent from the second terminal device through an optical fiber is branched and converted into an optical signal by control of the optical switch and output. In this aspect, when generating an optical signal in the optical signal conversion unit, a portion of the power supply light wave is branched and used. This eliminates the need to install a light source for generating the optical signal in the second terminal device, and eliminates the need to install an optical fiber for sending the optical signal light wave from the second terminal device, thus simplifying the system and reducing costs. As a method for branching a portion of the power supply light wave, an optical fiber type brancher, a micro-optics type brancher using lenses, semi-transparent mirrors, prisms, etc., can be used. The branching ratio should be designed based on the required intensity of the power supply light wave, etc.

[0014] In a sixth aspect, the present invention is characterized in that, in the contact information transmission system according to the fourth aspect, a portion of the power supply light wave sent from the second terminal device through an optical fiber is branched and converted into the optical signal by controlling the variable optical attenuator and output. In this aspect of the invention as well, by branching and using a portion of the power supply light wave when generating the optical signal in the optical signal conversion unit, a light source for generating the optical signal and an optical fiber for sending the optical signal light wave are not required, making it possible to simplify the system and reduce costs. [Effects of the Invention]

[0015] As described above, the present invention provides a contact information transmission system that can operate stably even in the event of electromagnetic interference such as lightning strikes and enables the transmission of contact information. [Brief explanation of the drawing]

[0016] [Figure 1] A block diagram showing an example of a power supply system using the contact information transmission system according to Embodiment 1 of the present invention. [Figure 2] A block diagram showing an example of the configuration of the optical signal conversion unit, optical receiving unit, and optical power supply unit in Example 1. [Figure 3] A block diagram showing an example of the configuration of the optical signal conversion unit, optical receiving unit, and optical power supply unit of the contact information transmission system according to Embodiment 2. [Figure 4] A block diagram showing an example of the configuration of the optical signal conversion unit, optical receiving unit, and optical power supply unit of the contact information transmission system according to Embodiment 3. [Figure 5] A block diagram showing an example of the configuration of the optical signal conversion unit, optical receiving unit, and optical power supply unit of the contact information transmission system according to Embodiment 4. [Modes for carrying out the invention]

[0017] The contact information transmission system of the present invention will be described in detail below with reference to the drawings. In the description of the drawings, the same elements are denoted by the same reference numerals, and redundant descriptions are omitted. [Examples]

[0018] FIG. 1 is a block configuration diagram showing an example of a power supply system using the contact information transmission system according to Embodiment 1 of the present invention. In FIG. 1, the contact information transmission system of this embodiment includes a SOG control device 10 which is a first terminal device, and an in-office terminal device 20 which is a second terminal device. The SOG control device 10 has a first contact information output unit 12 that outputs first contact information 11. The in-office terminal device 20 has a second contact information output unit 22 that outputs second contact information 21 based on the first contact information transmitted from the SOG control device 10. The SOG control device 10 includes an optical signal conversion unit 14 that converts the first contact information 11 into an optical signal 13 and outputs it. The optical signal 13 is transmitted to the in-office terminal device 20 through an optical fiber 15. In the in-office terminal device 20, the optical signal 13 is converted into an electrical signal 26 by an optical reception unit 24 and input to the second contact information output unit 22. In the second contact information output unit 22, the second contact information 21 is output based on the first contact information included in the electrical signal 26. Further, in this embodiment, the in-office terminal device 20 has a power supply light source 27, and the power supply light wave 23 for power supply is sent from the power supply light source 27 to the SOG control device 10 through the optical fiber 25. The SOG control device 10 includes a light receiving element 16, receives the power supply light wave 23, generates a current or a voltage, and obtains power for driving the optical signal conversion unit 14 by the light energy of the power supply light wave 23. That is, it obtains power by optical power supply from the in-office terminal device 20.

[0019] In FIG. 1, the SOG control device 10 is installed in association with an air load switch (PAS) 1 installed at the boundary between the power line 2 on the consumer side such as a business office and the power line 3 on the power company side that supplies power, and controls the SOG operation. When a short circuit or overcurrent accident occurs within the business office, the PAS 1 detects this and automatically locks the switch. After temporarily interrupting the power supply by the circuit breaker on the power company side, the PAS 1 operates the switch. In such an accident, the SOG control device 10 outputs the first contact information 11 in order to output an alarm based on the sensor information 4 from the PAS 1. In this embodiment, the first contact information 11 is converted into an optical signal 13 and sent to the in-office terminal device 20 in the business office via the optical fiber 15, and from there, the second contact information 21 is sent to the power control device 5 and used for control such as accident response.

[0020] In this way, since the optical fiber 15 is used as the transmission path for the contact information, it is possible to prevent the surge voltage that reaches the SOG control device 10 due to lightning strikes or the like from propagating to the in-office terminal device 20 and destroying the in-office terminal device 20. Furthermore, since the power of the optical signal conversion unit 14 is obtained from the optical energy of the power supply light wave 23 sent from the in-office terminal device 20 through the optical fiber 25 instead of the power supply within the SOG control device 10, the optical signal conversion unit 14 is completely separated from the power supply, and when a large electromagnetic interference such as a lightning strike occurs, it is possible to prevent the associated surge voltage from entering the optical signal conversion unit 14 from the power supply. As a result, stable operation of the optical signal conversion unit 14 is ensured, and transmission of contact information to the in-office terminal device 20 without malfunction is possible.

[0021] Figure 2 is a block diagram showing an example of the configuration of the optical signal conversion unit, optical receiving unit, and optical power supply unit in this embodiment. Figures 2(a) and 2(b) show the configurations within the SOG control device 10 and the in-station terminal device 20, respectively. In Figure 2(a), the optical signal conversion unit 14 is equipped with a light-emitting diode 17, and the drive circuit 18 controls the drive current of the light-emitting diode 17 based on the first contact information 11 from the first contact information output unit 12, thereby generating an optical signal 13. In addition, the light-receiving element 16 receives the light wave 23 for power supply and generates a current or voltage to obtain power to drive the drive circuit 18. In Figure 2(b), the in-station terminal device 20 is equipped with a power-supplying semiconductor laser 27a as a power-supplying light source, and its output light is input to the optical fiber 25 as the power-supplying light wave 23. Furthermore, the optical receiving unit 24 includes an O / E converter 28 and a signal processing circuit 29. The optical signal 13 is converted into an electrical signal by the O / E converter 28, and the electrical signal 26, which includes the first contact information 11, is input to the second contact information output unit 22 via the signal processing circuit 29. [Examples]

[0022] Figure 3 is a block diagram showing an example of the configuration of the optical signal conversion unit, optical receiving unit, and optical power supply system of a contact information transmission system according to Embodiment 2 of the present invention. Although not shown in the illustration, this embodiment, like Embodiment 1, includes a first terminal device, which is an SOG control device, and a second terminal device, which is an in-station terminal device, and their basic configurations and functions are the same as in Embodiment 1. Figures 3(a) and 3(b) show the configurations inside the SOG control device and the in-station terminal device, respectively. In Figure 3(a), the optical signal conversion unit 30 includes an optical switch 31 and a control circuit 32, and converts the optical wave 34 for the optical signal sent from the in-station terminal device through the optical fiber 35 into an optical signal 36 under the control of the optical switch 31 and outputs it. The optical switch is a device that transmits (ON) or blocks (OFF) the optical path using an electrical signal, and controls ON / OFF by the control circuit 32 based on the first contact information 11 from the first contact information output unit 12, and outputs the optical signal 36. The optical signal 36 is input to the optical fiber 37 and sent to the in-station terminal device. Furthermore, the light-receiving element 16 receives the light wave 23 for power supply, generates a current or voltage, and obtains power to drive the control circuit 32.

[0023] As shown in Figure 3(b), similar to Embodiment 1, the in-station terminal device is equipped with a power supply semiconductor laser 27a as a power supply light source, and its output light is input to the optical fiber 25 as a power supply optical wave 23. In the optical receiving unit 24, the optical signal 13 is converted into an electrical signal by the O / E converter 28, and the electrical signal 26 is input to the second contact information output unit 22 via the signal processing circuit 29. However, in this embodiment, an optical signal semiconductor laser 33 is provided to generate an optical wave 34 for optical signals, and its output light is sent to the SOG control device via the optical fiber 35 as an optical wave 34 for optical signals.

[0024] In this embodiment as well, since the optical fiber 37 is used as the transmission path for contact information, surge voltages caused by lightning strikes and the like can be prevented from propagating to the terminal equipment within the central office. Furthermore, since the power for the optical signal conversion unit 30 is obtained from the optical energy of the power supply optical wave 23, the optical signal conversion unit 30 is completely isolated from the power source, ensuring stable operation of the optical signal conversion unit 30 and enabling the transmission of contact information without malfunction.

[0025] While various types of optical switches, such as optical waveguide type and MEMS type devices, can be used as optical switches in this embodiment, a highly reliable optical switch that can be driven with low power is desirable. [Examples]

[0026] Figure 4 is a block diagram showing an example of the configuration of the optical signal conversion unit, optical receiving unit, and optical power supply of a contact information transmission system according to Embodiment 3 of the present invention. Although not shown in the diagram, this embodiment, like Embodiment 1, includes a first terminal device, which is an SOG control device, and a second terminal device, which is an in-station terminal device, and their basic configurations and functions are the same as in Embodiment 1. Figures 4(a) and 4(b) show the configurations inside the SOG control device and the in-station terminal device, respectively.

[0027] As shown in Figure 4(a), in this embodiment, an optical fiber splitter 44 is provided, and the optical signal conversion unit 40 includes a variable optical attenuator 41 and a control circuit 42. The power supply optical wave 43 sent from the central office terminal device through the optical fiber 45 is split by the optical fiber splitter 44 into a power supply optical wave 43a and an optical signal optical wave 43b. The optical signal optical wave 43b is input to the variable optical attenuator 41, converted into an optical signal 46, and output. The variable optical attenuator 41 is a device that controls the transmission attenuation amount of the optical wave by an electrical signal, and the control circuit 42 controls the attenuation amount based on the first contact information 11 from the first contact information output unit 12 and outputs the optical signal 46. The optical signal 46 is input to the optical fiber 47 and sent to the central office terminal device. In addition, the light receiving element 16 receives the power supply optical wave 43a and generates a current or voltage to obtain power to drive the control circuit 42.

[0028] As shown in Figure 3(b), similar to Embodiment 1, the in-station terminal device is equipped with a power supply semiconductor laser 42 as a power supply light source, and its output light is input to the optical fiber 45 as a power supply optical wave 43. In this embodiment, a portion of the power supply optical wave 43 is used as an optical signal optical wave 43b, and therefore has an intensity that includes that portion. In the optical receiving unit 24, the optical signal 13 is converted into an electrical signal by the O / E converter 28, and the electrical signal 26 is input to the second contact information output unit 22 via the signal processing circuit 29.

[0029] In this embodiment as well, surge voltages caused by lightning strikes and the like can be prevented from propagating to the terminal equipment within the central office, the optical signal conversion unit 40 is completely isolated from the power supply, stable operation of the optical signal conversion unit 40 is ensured, and transmission of contact information without malfunction is possible. Various types of devices such as optical waveguide type and MEMS type can be used as variable optical attenuators in this embodiment, but a variable optical attenuator that is highly reliable and can be driven with low power is desirable. [Examples]

[0030] Figure 5 is a block diagram showing an example of the configuration of the optical signal conversion unit, optical receiving unit, and optical power supply unit of a contact information transmission system according to Embodiment 4 of the present invention. Although not shown in the diagram, this embodiment, like Embodiment 1, includes a first terminal device, which is an SOG control device, and a second terminal device, which is an in-station terminal device, and their basic configuration and basic functions are the same as in Embodiment 1. However, this embodiment differs in that it transmits four types of contact information. Figures 5(a) and 5(b) show the configurations inside the SOG control device and the in-station terminal device, respectively.

[0031] In Figure 5(a), the optical signal conversion unit 50 has four variable optical attenuators 51a, 51b, 51c, and 51d, four control circuits 52a, 52b, 52c, and 52d, and further includes an optical fiber splitter 54 and a 1x4 optical fiber splitter 58. First, the power supply optical wave 53 sent from the central office terminal device through the optical fiber 55 is split by the optical fiber splitter 54 into a power supply optical wave 53a and an optical signal optical wave 53b. Furthermore, the optical signal optical wave 53b is split by the 1x4 optical fiber splitter 58 into four optical signal optical waves 56a, 56b, 56c, and 56d, which are input to the variable optical attenuators 51a, 51b, 51c, and 51d, respectively. These four optical waves are each controlled by control circuits 52a, 52b, 52c, and 52d, respectively, based on four first contact information signals 11a, 11b, 11c, and 11d from the first contact information output unit 60, with the attenuation controlled by these circuits, and output optical signals 57a, 57b, 57c, and 57d. These four optical signals are input to optical fibers 59a, 59b, 59c, and 59d, respectively, and sent to the in-station terminal equipment. In addition, the light receiving element 61 receives the power supply optical wave 53a to generate a current or voltage, obtaining power to drive the four control circuits 52a, 52b, 52c, and 52d.

[0032] As shown in Figure 5(b), the in-station terminal device is equipped with a power supply semiconductor laser 62 as a power supply light source, and its output light is input to the optical fiber 55 as a power supply optical wave 53. In this embodiment, a portion of the power supply optical wave 53 is used as an optical wave for four optical signals, so it has an intensity that includes that portion. In the optical receiving unit 63, the optical signals 57a, 57b, 57c, and 57d sent through the four optical fibers are converted into electrical signals by O / E converters 28a, 28b, 28c, and 28d, respectively, and after passing through four signal processing circuits 29a, 29b, 29c, and 29d, four electrical signals 26a, 26b, 26c, and 26d, each containing the first contact information 11a, 11b, 11c, and 11d, respectively, are input to the second contact information output unit 64. The second contact information output unit 64 outputs four pieces of contact information.

[0033] In this embodiment as well, surge voltages caused by lightning strikes and the like can be prevented from propagating to the terminal equipment within the central office, the optical signal conversion unit 50 is completely isolated from the power supply, stable operation of the optical signal conversion unit 50 is ensured, and transmission of contact information without malfunction is possible.

[0034] It goes without saying that the present invention is not limited to the embodiments described above, and various modifications are possible depending on the purpose. For example, the number of contact information to be transmitted can be arbitrarily set according to the system requirements, and the configuration of the optical signal conversion unit, optical receiving unit, optical power supply unit, and light receiving unit can be designed according to the number of contact information. In addition, the first terminal device and the second terminal device may be equipped with components and electrical circuits other than those shown in the embodiments, as needed. [Explanation of Symbols]

[0035] 1 PAS 2, 3 Power lines 4. Sensor Information 5 Power supply control device 10 SOG control unit 11, 11a, 11b, 11c, 11d First contact information 12, 60 First contact information output unit 13, 36, 46, 57a, 57b, 57c, 57d optical signal 14, 30, 40, 50 Optical signal conversion section 15, 25, 35, 37, 45, 47, 55, 59a, 59b, 59c, 59d optical fiber 16, 61 Photodetector 17 Light-emitting diodes 18 Drive Circuit 20. In-office terminal equipment 21. Second Contact Information 22, 64 Second contact information output unit 23, 43, 43a, 53, 53a: Optical waves for power supply. 24, 63 Optical receiving section 26, 26a, 26b, 26c, 26d Electrical signals 27 Light source for power supply 27a, 42, 62 Semiconductor laser for power supply 28, 28a, 28b, 28c, 28d O / E converter 29, 29a, 29b, 29c, 29d Signal processing circuits 31 Optical switch 32, 42, 52a, 52b, 52c, 52d control circuits 33 Semiconductor lasers for optical signals 34, 43b, 53b, 56a, 56b, 56c, 56d Optical waves for optical signals 41, 51a, 51b, 51c, 51d Variable optical attenuator 44, 54 Fiber Optic Splitter 58 1x4 Fiber Optic Splitter

Claims

1. A transmission system comprising a first terminal device having a first contact information output unit that outputs first contact information indicating the opening or short-circuiting of a contact, and a second terminal device having a second contact information output unit that outputs second contact information based on the first contact information transmitted from the first terminal device, The first terminal device includes an optical signal conversion unit that converts the first contact information into an optical signal and outputs it, the optical signal is transmitted to the second terminal device by an optical fiber, converted into an electrical signal and input to the second contact information output unit, The power to drive the optical signal conversion unit is supplied from the second terminal device to the first terminal device as optical energy via an optical fiber. The first terminal device has an optical fiber splitter that splits the power supply light wave sent from the second terminal device through an optical fiber, The optical signal conversion unit includes an optical switch that transmits or blocks an optical path using an electrical signal, and the optical wave branched by the optical fiber splitter is converted into the optical signal by the control of the optical switch and output, characterized in that it is a contact information transmission system.

2. A transmission system comprising a first terminal device having a first contact information output unit that outputs first contact information indicating the opening or short-circuiting of a contact, and a second terminal device having a second contact information output unit that outputs second contact information based on the first contact information transmitted from the first terminal device, The first terminal device includes an optical signal conversion unit that converts the first contact information into an optical signal and outputs it, the optical signal is transmitted to the second terminal device by an optical fiber, converted into an electrical signal and input to the second contact information output unit, The power to drive the optical signal conversion unit is supplied from the second terminal device to the first terminal device as optical energy via an optical fiber. The first terminal device has an optical fiber splitter that splits the power supply light wave sent from the second terminal device through an optical fiber, The contact information transmission system is characterized in that the optical signal conversion unit includes a variable optical attenuator that controls the transmission attenuation of an optical wave by an electrical signal, and converts the optical wave branched by the optical fiber splitter into the optical signal by controlling the variable optical attenuator and outputs it.

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