Optical fiber sensing system, optical fiber sensing device, and optical fiber sensing method

Abstract

An optical fiber sensing system according to the present disclosure includes: an optical fiber (10) one end of which is connected to an ONU (21); an optical output unit (211) that outputs pulsed light to the one end of the optical fiber (10); an optical input unit (212) that receives, from the one end of the optical fiber (10), backscattered light with respect to the pulsed light; and a detection unit (213) that transmits state information indicating the state of the surroundings of the optical fiber (10) based on the backscattered light.

Description

[Technical Field]

[0001] The present disclosure relates to fiber optic sensing systems, fiber optic sensing devices, and fiber optic sensing methods. [Background technology]

[0002] In recent years, a technology called optical fiber sensing, which uses an optical fiber as a sensor to sense the condition around the optical fiber, has been attracting attention. Specifically, in optical fiber sensing, an optical fiber sensing device outputs pulsed light to an optical fiber, receives backscattered light corresponding to the pulsed light, and senses the condition around the optical fiber based on the received backscattered light. For example, Patent Document 1 discloses a technique for identifying an event (for example, an abnormality) occurring around an optical fiber by performing optical fiber sensing.

[0003] In recent years, PON (Passive Optical Network) systems, which are one of the technologies that enable FTTH (Fiber to the Home), which involves pulling optical fiber from a telecommunications carrier's telecommunications center into a user's home, have also been attracting attention. For example, Patent Document 2 discloses a PON system configured such that an optical line terminal (OLT) on the communication station side is connected to multiple optical network units (ONUs) on the user side via transmission paths. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] International Publication No. 2021 / 070222 [Patent Document 2] Japanese Patent Application Laid-Open No. 2012-151737 Summary of the Invention [Problem to be solved by the invention]

[0005] As mentioned above, optical fiber sensing technology and PON systems have been attracting attention in recent years. Recently, there has been a study on applying optical fiber sensing technology to PON systems to identify events occurring on or near user premises.

[0006] One example of a configuration for applying optical fiber sensing technology to a PON system is to have the OLT on the communications station side function as an optical fiber sensing device, and the OLT identify events that occur in or around residential areas.

[0007] However, when the OLT is made to function as an optical fiber sensing device, it is necessary to be able to identify the vicinity of which ONU among multiple ONUs an event detected by the OLT has occurred.

[0008] Furthermore, the accuracy of optical fiber sensing depends on the distance from the optical fiber sensing device to the location where the event occurred. Therefore, when the OLT functions as an optical fiber sensing device, the distance mentioned above is inevitably longer, which may result in a decrease in the accuracy of optical fiber sensing. Therefore, there has been a recent demand for technology that can more accurately identify events occurring on or around a user's residential land.

[0009] In view of the above-mentioned problems, an object of the present disclosure is to provide an optical fiber sensing system, an optical fiber sensing device, and an optical fiber sensing method that can more accurately identify events on or around residential land. [Means for solving the problem]

[0010] An optical fiber sensing system according to one aspect includes: An optical fiber connected to an ONU (Optical Network Unit) at one end, an optical output unit that outputs pulsed light to the one end of the optical fiber; an optical input unit that receives backscattered light corresponding to the pulsed light from the one end of the optical fiber; a detector that transmits status information indicating a status of the periphery of the optical fiber based on the backscattered light; Equipped with.

[0011] According to one aspect, an optical fiber sensing device includes: an optical output unit that outputs pulsed light to one end of an optical fiber, the one end of which is connected to an ONU (Optical Network Unit); an optical input unit that receives backscattered light corresponding to the pulsed light from the one end of the optical fiber; a detector that transmits status information indicating a status of the periphery of the optical fiber based on the backscattered light; Equipped with.

[0012] An optical fiber sensing method according to one aspect includes: A method of optical fiber sensing using an optical fiber sensing device, comprising: an output step of outputting pulsed light to one end of an optical fiber, the one end of which is connected to an ONU (Optical Network Unit); a receiving step of receiving backscattered light corresponding to the pulsed light from the one end of the optical fiber; a transmitting step of transmitting status information indicating a status of the periphery of the optical fiber based on the backscattered light; Includes.

[0013] According to the above-described aspects, it is possible to provide an optical fiber sensing system, an optical fiber sensing device, and an optical fiber sensing method that can more accurately identify phenomena occurring on or around a residential area. [Brief explanation of the drawings]

[0014] [Figure 1] 1 is a diagram illustrating a configuration example of an optical fiber sensing system according to a first embodiment. [Figure 2] 3 is a flowchart showing an example of a schematic operation flow of the optical fiber sensing system according to the first embodiment. FIG. [Figure 3] FIG. 10 is a diagram illustrating a configuration example of an optical fiber sensing system according to a second embodiment. [Figure 4] FIG. 10 is a diagram illustrating a configuration example of an optical fiber sensing system according to a third embodiment. [Figure 5] FIG. 10 is a diagram illustrating a configuration example of an optical fiber sensing system according to a fourth embodiment. [Figure 6] FIG. 10 is a flowchart showing an example of a schematic operation flow of the optical fiber sensing system according to the fourth embodiment. [Figure 7] FIG. 10 is a diagram illustrating a configuration example of an optical fiber sensing system according to a fifth embodiment. [Figure 8] 2 is a block diagram showing an example of the hardware configuration of a computer that realizes an ONU according to an embodiment. FIG. DETAILED DESCRIPTION OF THE INVENTION

[0015] Hereinafter, embodiments of the present disclosure will be described with reference to the drawings. Note that the following description and drawings have been omitted and simplified as appropriate for clarity of explanation. In addition, in the following drawings, the same elements are given the same reference numerals, and duplicate explanations are omitted as necessary.

[0016] <First Embodiment> First, with reference to FIG. 1, an example of the configuration of an optical fiber sensing system according to the first embodiment will be described.

[0017] As shown in FIG. 1, the optical fiber sensing system according to the first embodiment includes an optical fiber 10 and an ONU 21. The ONU 21 is installed in a user's home 20, which is a building, and is connected to an optical fiber 10. The optical fiber 10 is realized as a PON line, one end of which is connected to an ONU 21 provided in a user's home 20 and the other end of which is connected to an OLT 31 provided inside a communication station 30 .

[0018] 1 is based on the premise that there are a plurality of user premises 20, and an optical fiber 10 connected to the OLT 31 is connected to a plurality of optical fibers 10 respectively connected to ONUs 21 in the plurality of user premises 20 by an optical branch 40. However, the number of user premises 20 is not limited to a plurality, and may be one or more.

[0019] In the first embodiment, the ONU 21 functions as an optical fiber sensing device. The ONU 21 includes an optical output unit 211 and an optical input unit 212, and further includes a detection unit 213, in order to realize the function of the optical fiber sensing device.

[0020] The optical output unit 211 outputs pulsed light to the optical fiber 10 . The optical input unit 212 receives, from the optical fiber 10, backscattered light that is generated as the pulsed light output by the optical output unit 211 is transmitted through the optical fiber 10. In the first embodiment, the optical fiber 10 is a PON line, and therefore also transmits the optical signal for communication from the OLT 31. Therefore, in order for the optical input unit 212 to receive only the backscattered light, it is preferable to shift the wavelength of the pulsed light output from the optical output unit 211 from the wavelength of the optical signal for communication from the OLT 31 and to provide a filter in the upstream stage of the optical input unit 212, for example.

[0021] Here, when vibration occurs around the optical fiber 10, the vibration is transmitted to the optical fiber 10, and the characteristics (for example, wavelength) of the backscattered light transmitted through the optical fiber 10 change. Therefore, the detector 213 can detect vibrations occurring around the optical fiber 10 based on the backscattered light received from the optical fiber 10 by the light input unit 212 .

[0022] Furthermore, when detecting vibration based on backscattered light, the detection section 213 can identify the strength of the vibration based on the degree of change in the characteristics of the backscattered light. Furthermore, the detection unit 213 can identify the position where the backscattered light has occurred (the distance of the optical fiber 10 from the ONU 21) based on the time difference between the time when the optical output unit 211 outputs pulsed light to the optical fiber 10 and the time when the optical input unit 212 receives the backscattered light from the optical fiber 10. Therefore, when the detection unit 213 detects vibration based on the backscattered light, it can identify the position where the backscattered light has occurred and identify this identified position as the position where vibration has occurred. Furthermore, the detection unit 213 can identify the time when vibration occurs around the optical fiber 10.

[0023] Therefore, when the detection unit 213 detects vibrations occurring around the optical fiber 10, it is possible to acquire vibration data indicating the vibrations as sensing data based on the intensity, location, and time of occurrence of the vibrations.

[0024] Furthermore, if sound is generated around the optical fiber 10, the sound is transmitted to the optical fiber 10, and the characteristics of the backscattered light transmitted through the optical fiber 10 change. Furthermore, if a temperature change occurs around the optical fiber 10, the characteristics of the backscattered light transmitted through the optical fiber 10 also change.

[0025] Therefore, the detection unit 213 can also detect sound and temperature generated around the optical fiber 10 based on the backscattered light received from the optical fiber 10 by the light input unit 212. Furthermore, when the detection unit 213 detects sound generated around the optical fiber 10, it can acquire acoustic data indicating the sound as sensing data. Furthermore, when the detection unit 213 detects the temperature around the optical fiber 10, it can acquire temperature data indicating the temperature as sensing data.

[0026] Therefore, the detection unit 213 transmits sensing data acquired based on the backscattered light as described above as status information indicating the status of the periphery of the optical fiber 10. The sensing data transmitted as status information may include at least one of vibration data, acoustic data, and temperature data. The destination of the status information may be any, and may be, for example, a terminal of a user who owns or uses the user home 20, a security company, the police, a fire department, or the like. The detection unit 213 may transmit the status information via a dedicated line, or may transmit the status information via the optical fiber 10, which is a PON line. The detection unit 213 may also transmit the sensing data as status information after performing A / D conversion processing.

[0027] Next, an example of a schematic flow of operations of the optical fiber sensing system according to the first embodiment will be described with reference to FIG. As shown in FIG. 2, first, the light output unit 211 outputs pulsed light to the optical fiber 10 (step S11). Next, the light input unit 212 receives, from the optical fiber 10, backscattered light corresponding to the pulsed light output by the light output unit 211 (step S12).

[0028] Thereafter, the detection unit 213 acquires sensing data based on the backscattered light received by the light input unit 212, and transmits the acquired sensing data as status information indicating the status of the periphery of the optical fiber 10 (step S13). The sensing data may include at least one of vibration data, acoustic data, and temperature data.

[0029] As described above, according to the first embodiment, the ONU 21 outputs pulsed light to the optical fiber 10 and receives backscattered light from the optical fiber 10, and transmits sensing data based on the backscattered light as status information indicating the status around the optical fiber 10.

[0030] That is, according to the first embodiment, the ONU 21 senses the state of the periphery of the optical fiber 10 and transmits the sensing data as status information. Therefore, the destination of the status information can more accurately identify events occurring on or around the land of the user's home 20.

[0031] <Embodiment 2> Next, with reference to FIG. 3, an example of the configuration of an optical fiber sensing system according to the second embodiment will be described. As shown in Figure 3, the optical fiber sensing system of this embodiment 2 differs from the above-mentioned embodiment 1 in that the optical fiber 10, which is a PON line, is routed around the residential area of the user's home 20 and then connected to the ONU 21.

[0032] According to the second embodiment, the optical fiber 10, which is a PON line, is laid so as to surround the periphery of the land of the user's home 20, so that events on or around the land of the user's home 20 can be detected in more detail compared to the first embodiment described above.

[0033] The second embodiment differs from the first embodiment described above only in the method of laying the optical fiber 10, which is the PON line, and the other configurations are the same. Therefore, the operation and effects of the second embodiment other than those described above are the same as those of the first embodiment described above, and therefore a description thereof will be omitted.

[0034] <Third Embodiment> Next, with reference to FIG. 4, a configuration example of an optical fiber sensing system according to the third embodiment will be described. As shown in Figure 4, the optical fiber sensing system of this embodiment 3 differs from the above-mentioned embodiment 1 in that an optical fiber 10A dedicated to sensing is provided and sensing is performed using the optical fiber 10A, and that the optical fiber 10A is routed to surround the residential area of the user's home 20 and then connected to the ONU 21.

[0035] According to the second embodiment, sensing is performed using an optical fiber 10A dedicated to sensing, and therefore, compared to the first embodiment described above, there is no need to provide a filter in front of the optical input unit 212 so that the optical input unit 212 can receive only backscattered light. Also, since the optical fiber 10A is laid so as to surround the periphery of the land of the user's home 20, it is possible to detect events on the land of the user's home 20 or in the vicinity of the land in more detail than in the first embodiment described above.

[0036] The present embodiment 3 is different from the above-described embodiment 1 only in the optical fiber 10A used for sensing and the method of laying the optical fiber 10A, and the other configurations are the same. Therefore, the operation and effects other than those described above of the present embodiment 3 are the same as those of the above-described embodiment 1, and therefore a description thereof will be omitted.

[0037] <Fourth Embodiment> Next, with reference to FIG. 5, an example of the configuration of an optical fiber sensing system according to the fourth embodiment will be described. As shown in FIG. 5, the optical fiber sensing system according to the fourth embodiment differs from the first embodiment in that an identifying unit 214 is added to the ONU 21.

[0038] Here, when an event (e.g., an abnormality) that involves vibration occurs around the optical fiber 10, vibration corresponding to the event is transmitted to the optical fiber 10, and the characteristics (e.g., intensity) of the backscattered light transmitted through the optical fiber 10 change.

[0039] Therefore, the vibration data acquired by the detection unit 213 based on the backscattered light contains unique vibration patterns that vary depending on the event, such as the strength of the vibration, the vibration position, and the transition of the vibration frequency fluctuation. Therefore, by analyzing the dynamic changes in the vibration pattern contained in the vibration data, it is possible to identify the event that caused the vibration.

[0040] Furthermore, if an event accompanied by sound occurs around the optical fiber 10, sound corresponding to that event is transmitted to the optical fiber 10, changing the characteristics of the backscattered light transmitted through the optical fiber 10. Therefore, the acoustic data acquired by the detection unit 213 based on the backscattered light contains a unique acoustic pattern corresponding to that event.

[0041] Furthermore, if an event that causes a temperature change occurs around the optical fiber 10, the characteristics of the backscattered light transmitted through the optical fiber 10 also change. Therefore, the temperature data acquired by the detection unit 213 based on the backscattered light contains a unique temperature pattern corresponding to the event.

[0042] Therefore, the identification unit 214 identifies an event that has occurred on the land of the user's home 20 or in the vicinity of the land, based on the sensing data acquired by the detection unit 213 based on the backscattered light. Specifically, the identification unit 214 identifies an event that has occurred on the land or in the vicinity of the land, using one of the methods described below. Note that, below, an example will be described in which vibration data is used as sensing data.

[0043] (A) Method A For each event to be identified, the identification unit 214 stores in advance in a memory (not shown) or the like, the vibration pattern contained in the vibration data of the vibration that actually occurred when the event occurred, as a matching pattern.

[0044] First, the detector 213 acquires vibration data based on the backscattered light received from the optical fiber 10 by the light input unit 212 . Next, the identification unit 214 compares the vibration pattern included in the vibration data acquired by the detection unit 213 with the matching pattern. If there is a matching pattern among the matching patterns whose compatibility rate with the vibration pattern is equal to or greater than a threshold, the identification unit 214 determines that an event corresponding to the matching pattern has occurred on the land of the user home 20 or in the vicinity of the land.

[0045] (B) Method B The identification unit 214 prepares, for each event to be identified, a pair of teacher data indicating the event and a vibration pattern contained in the vibration data of the vibration that actually occurred when the event occurred, and inputs each prepared pair to construct a learning model in advance using a convolutional neural network (CNN), which is then stored in advance in a memory or the like (not shown).

[0046] First, the detector 213 acquires vibration data based on the backscattered light received from the optical fiber 10 by the light input unit 212 . Next, the identification unit 214 inputs the vibration pattern included in the vibration data acquired by the detection unit 213 into the learning model. As a result, the identification unit 214 obtains information on an event that has occurred on the land of the user's home 20 or in the vicinity of the land as an output result of the learning model.

[0047] When the identification unit 214 identifies an event that has occurred on the land of the user's home 20 or in the vicinity of the land, the detection unit 213 transmits the identification result of the event that has occurred on the land of the user's home 20 or in the vicinity of the land as status information indicating the condition of the area around the optical fiber 10.

[0048] 5, sensing is performed using optical fiber 10, which is a PON line, as in the first embodiment shown in FIG. 1, and the laying method of optical fiber 10 is also the same as in FIG. 1, but this is not limiting. The optical fiber 10, which is a PON line, may be laid so as to surround the periphery of the residential area of user home 20, as in the second embodiment shown in FIG. 3. Alternatively, sensing may be performed using optical fiber 10A dedicated to sensing, as in the third embodiment shown in FIG. 4, and the laying method of optical fiber 10A may also be the same as in FIG. 4.

[0049] Next, an example of a schematic flow of operations of the optical fiber sensing system according to the fourth embodiment will be described with reference to FIG. As shown in FIG. 6, first, the processes of steps S21 and S22, which are similar to steps S11 and S12 in FIG. 2, are performed.

[0050] Next, the detection unit 213 acquires sensing data based on the backscattered light received by the light input unit 212, and the identification unit 214 identifies an event that has occurred on the land of the user's home 20 or in the vicinity of the land based on the sensing data acquired by the detection unit 213 (step S23). The event may be identified using either method A or method B described above.

[0051] Thereafter, the detection unit 213 transmits the result of identification of the event that occurred on or around the land of the user's home 20, identified by the identification unit 214, as status information indicating the status of the area around the optical fiber 10 (step S24).

[0052] As described above, according to the fourth embodiment, an event that has occurred on the land of the user's home 20 or in the vicinity of the land is identified based on sensing data obtained by sensing the condition around the optical fiber 10 on the ONU 21 side, and the result of identifying the event is transmitted as status information indicating the condition around the optical fiber 10. Therefore, the ONU 21 side can more accurately identify the event that has occurred on the land of the user's home 20 or in the vicinity of the land. Furthermore, the destination of the status information can obtain a more accurate result of identifying the event.

[0053] <Fifth Embodiment> Next, with reference to FIG. 7, a configuration example of an optical fiber sensing system according to the fifth embodiment will be described. As shown in Figure 7, the optical fiber sensing system of this embodiment 5 differs from the above-mentioned embodiment 4 in that a determination unit 50 having the same functions as the determination unit 214 provided in the ONU 21 inside the user's home 20 is provided outside the user's home 20.

[0054] As described above, the identification unit 50 has the same function as the identification unit 214 according to the above-described embodiment 4. That is, the identification unit 50 has the function of identifying an event that has occurred on the land of the user's home 20 or in the vicinity of the land, based on the sensing data acquired by the detection unit 213 based on the backscattered light.

[0055] Therefore, when the detection unit 213 transmits state information indicating the state around the optical fiber 10, first, it acquires sensing data based on the backscattered light, and transmits the acquired sensing data to the identification unit 50. Then, as a response to the sensing data, the detection unit 213 receives the identification result of the event that occurred in the user's home 20 or around the home from the identification unit 50, and transmits the received identification result as state information. Note that the detection unit 213 may use its own line for communication with the identification unit 50, or may use the optical fiber 10 which is a PON line. Also, the detection unit 213 may perform A / D conversion processing on the sensing data and then transmit it to the identification unit 50.

[0056] According to the fifth embodiment, since the identification unit 50 with a large processing load is provided outside the user's home 20, the processing load of the ONU 21 can be reduced as compared with the fourth embodiment described above.

[0057] Note that the fifth embodiment is different from the fourth embodiment described above only in that the identification unit 50 is provided outside the user's home 20, and the other configurations are the same. Therefore, the fifth embodiment is the same as the fourth embodiment described above in terms of effects other than the operation and the effects described above, and thus the description thereof is omitted.

[0058] <Other Embodiments> In the above-described embodiments, the optical output unit 211, the optical input unit 212, and the detection unit 213 are provided inside the ONU 21, but it is not limited thereto. For example, even if the optical output unit 211 is provided outside the ONU 21, it may be any device that outputs pulsed light to one end of the optical fiber 10 connected to the ONU 21. Also, even if the optical input unit 212 is provided outside the ONU 21, it may be any device that receives backscattered light from one end of the optical fiber 10 connected to the ONU 21.

[0059] <Hardware Configuration of ONU (Optical Fiber Sensing Device)> Next, with reference to FIG. 8, an example of the hardware configuration of a computer 60 that realizes the ONU (optical fiber sensing device) 21 according to the above-described embodiment will be described.

[0060] 8, the computer 60 includes a processor 61, a memory 62, a storage 63, an input / output interface (input / output I / F) 64, and a communication interface (communication I / F) 65. The processor 61, the memory 62, the storage 63, the input / output interface 64, and the communication interface 65 are connected by a data transmission path for transmitting and receiving data to and from each other.

[0061] The processor 61 is, for example, an arithmetic processing device such as a CPU (Central Processing Unit) or a GPU (Graphics Processing Unit). The memory 62 is, for example, a memory such as a RAM (Random Access Memory) or a ROM (Read Only Memory). The storage 63 is, for example, a storage device such as an HDD (Hard Disk Drive), an SSD (Solid State Drive), or a memory card. The storage 63 may also be a memory such as a RAM or a ROM.

[0062] A program is stored in the storage 63. When the program is loaded into the computer, it includes a set of instructions (or software code) for causing the computer 60 to perform one or more functions of the ONU 21 described above. The optical output unit 211, the optical input unit 212, the detection unit 213, and the identification unit 214 of the ONU 21 described above may be realized by the processor 61 reading and executing a program stored in the storage 63. Furthermore, the storage function of the ONU 21 described above may be realized by the memory 62 or the storage 63.

[0063] The above-described programs may also be stored on non-transitory computer-readable media or tangible storage media. By way of example and not limitation, computer-readable media or tangible storage media include RAM, ROM, flash memory, SSD or other memory technology, CD (Compact Disc)-ROM, DVD (Digital Versatile Disc), Blu-ray® disc or other optical disk storage, magnetic cassette, magnetic tape, magnetic disk storage or other magnetic storage devices. The programs may also be transmitted on a transitory computer-readable medium or communication medium. By way of example and not limitation, transitory computer-readable media or communication media include electrical, optical, acoustic, or other forms of propagated signals.

[0064] The input / output interface 64 is connected to a display device 641, an input device 642, a sound output device 643, etc. The display device 641 is a device that displays a screen corresponding to drawing data processed by the processor 61, such as an LCD (Liquid Crystal Display), a CRT (Cathode Ray Tube) display, or a monitor. The input device 642 is a device that accepts operational inputs from an operator, such as a keyboard, a mouse, or a touch sensor. The display device 641 and the input device 642 may be integrated and realized as a touch panel. The sound output device 643 is a device that outputs sound corresponding to audio data processed by the processor 61, such as a speaker.

[0065] The communication interface 65 transmits and receives data to and from an external device. For example, the communication interface 65 communicates with the external device via a wired communication path or a wireless communication path.

[0066] Although the present disclosure has been described above with reference to the embodiments, the present disclosure is not limited to the above-described embodiments. Various modifications that can be understood by those skilled in the art can be made to the configuration and details of the present disclosure within the scope of the present disclosure. For example, some or all of the above-described embodiments may be used in combination with each other.

[0067] Furthermore, some or all of the above-described embodiments can be described as, but are not limited to, the following supplementary notes. (Appendix 1) An optical fiber connected to an ONU (Optical Network Unit) at one end, an optical output unit that outputs pulsed light to the one end of the optical fiber; an optical input unit that receives backscattered light corresponding to the pulsed light from the one end of the optical fiber; a detector that transmits status information indicating a status of the periphery of the optical fiber based on the backscattered light; An optical fiber sensing system comprising: (Appendix 2) The detection unit transmits the status information via a PON (Passive Optical Network) line. 10. The optical fiber sensing system of claim 1. (Appendix 3) The optical fiber is the PON line. 10. The optical fiber sensing system of claim 2. (Appendix 4) The optical fiber is an optical fiber dedicated to sensing. 3. The optical fiber sensing system according to claim 1 or 2. (Appendix 5) The optical fiber is laid so as to surround the periphery of the building where the ONU is installed. 5. The optical fiber sensing system of any one of appendices 1 to 4. (Appendix 6) the detection unit acquires sensing data indicating a state around the optical fiber based on the backscattered light, and transmits the sensing data as the state information. 6. The optical fiber sensing system of any one of appendices 1 to 5. (Appendix 7) the detection unit acquires sensing data indicating a state around the optical fiber based on the backscattered light; The optical fiber sensing system includes: An identification unit that identifies an event that has occurred in or around the residential land of the building where the ONU is installed based on the sensing data, the detection unit transmits a result of the event identification by the identification unit as the status information; 6. The optical fiber sensing system of any one of appendices 1 to 5. (Appendix 8) an optical output unit that outputs pulsed light to one end of an optical fiber, the one end of which is connected to an ONU (Optical Network Unit); an optical input unit that receives backscattered light corresponding to the pulsed light from the one end of the optical fiber; a detector that transmits status information indicating a status of the periphery of the optical fiber based on the backscattered light; An optical fiber sensing device comprising: (Appendix 9) The detection unit transmits the status information via a PON (Passive Optical Network) line. 10. The optical fiber sensing device of claim 8. (Appendix 10) The optical fiber is the PON line. 10. The optical fiber sensing device of claim 9. (Appendix 11) The optical fiber is an optical fiber dedicated to sensing. 10. The optical fiber sensing device according to claim 8 or 9. (Appendix 12) The optical fiber is laid so as to surround the periphery of the building where the ONU is installed. 12. The optical fiber sensing device of any one of appendixes 8 to 11. (Appendix 13) the detection unit acquires sensing data indicating a state around the optical fiber based on the backscattered light, and transmits the sensing data as the state information. 13. The optical fiber sensing device of any one of appendices 8 to 12. (Appendix 14) the detection unit acquires sensing data indicating a state around the optical fiber based on the backscattered light; The optical fiber sensing device comprises: An identification unit that identifies an event that has occurred in or around the residential land of the building where the ONU is installed based on the sensing data, the detection unit transmits a result of the event identification by the identification unit as the status information; 13. The optical fiber sensing device of any one of appendices 8 to 12. (Appendix 15) A method of optical fiber sensing using an optical fiber sensing device, comprising: an output step of outputting pulsed light to one end of an optical fiber, the one end of which is connected to an ONU (Optical Network Unit); a receiving step of receiving backscattered light corresponding to the pulsed light from the one end of the optical fiber; a transmitting step of transmitting status information indicating a status of the periphery of the optical fiber based on the backscattered light; An optical fiber sensing method comprising: (Appendix 16) In the transmitting step, the status information is transmitted via a PON (Passive Optical Network) line. 16. The optical fiber sensing method of claim 15. (Appendix 17) The optical fiber is the PON line. 17. The optical fiber sensing method of claim 16. (Appendix 18) The optical fiber is an optical fiber dedicated to sensing. 17. The optical fiber sensing method according to claim 15 or 16. (Appendix 19) The optical fiber is laid so as to surround the periphery of the building where the ONU is installed. 19. An optical fiber sensing method according to any one of appendices 15 to 18. (Appendix 20) The method further includes acquiring sensing data indicating a state around the optical fiber based on the backscattered light, In the transmitting step, the sensing data is transmitted as the status information. 20. An optical fiber sensing method according to any one of appendices 15 to 19. (Appendix 21) acquiring sensing data indicating a state around the optical fiber based on the backscattered light; and identifying an event that has occurred in or around the building site where the ONU is installed based on the sensing data, In the transmitting step, the result of identifying the event is transmitted as the status information. 20. An optical fiber sensing method according to any one of appendices 15 to 19. [Explanation of symbols]

[0068] 10 Optical Fiber 20 User's home 21 ONU 211 Optical output section 212 Optical input section 213 Detector 214 Specific section 30 Communications Building 31 OLT 40 Optical Branching 50 Specific section 60 Computer 61 processors 62 memory 63 Storage 64 Input / Output Interface 641 Display device 642 Input Device 643 Sound Output Device 65 Communication Interface

Claims

1. an optical fiber connected to an ONU (Optical Network Unit); an optical output unit that outputs pulsed light to the one end of the optical fiber; an optical input unit that receives backscattered light corresponding to the pulsed light from the one end of the optical fiber; a detector that transmits status information indicating a status of the periphery of the optical fiber based on the backscattered light; Equipped with The optical fiber is laid so as to surround the periphery of the building site where the ONU is installed. Fiber optic sensing system.

2. The detection unit transmits the status information via a PON (Passive Optical Network) line. The optical fiber sensing system of claim 1 .

3. an optical output unit that outputs pulsed light to one end of an optical fiber connected to an ONU (Optical Network Unit); an optical input unit that receives backscattered light corresponding to the pulsed light from the one end of the optical fiber; a detector that transmits status information indicating a status of the periphery of the optical fiber based on the backscattered light; Equipped with The optical fiber is laid so as to surround the periphery of the building site where the ONU is installed. Fiber optic sensing equipment.

4. The detection unit transmits the status information via a PON (Passive Optical Network) line.

4. The fiber optic sensing instrument of claim 3.

5. the optical fiber is the PON line; 5. The fiber optic sensing instrument of claim 4.

6. The optical fiber is an optical fiber dedicated to sensing.

5. The optical fiber sensing device according to claim 3 or 4.

7. the detection unit acquires sensing data indicating a state around the optical fiber based on the backscattered light, and transmits the sensing data as the state information.

7. An optical fiber sensing instrument according to any one of claims 3 to 6.

8. the detection unit acquires sensing data indicating a state around the optical fiber based on the backscattered light; The optical fiber sensing device comprises: an identification unit that identifies an event that has occurred on or around the land of the building where the ONU is installed based on the sensing data; the detection unit transmits a result of the event identification by the identification unit as the status information; 7. An optical fiber sensing instrument according to any one of claims 3 to 6.

9. A method of optical fiber sensing using an optical fiber sensing device, comprising: an output step of outputting pulsed light to one end of an optical fiber, the one end of which is connected to an ONU (Optical Network Unit); a receiving step of receiving backscattered light corresponding to the pulsed light from the one end of the optical fiber; a transmitting step of transmitting status information indicating a status of the periphery of the optical fiber based on the backscattered light; Including, The optical fiber is laid so as to surround the periphery of the building site where the ONU is installed. Fiber optic sensing methods.

Images