Optical power supply system and abnormality detection method

Abstract

The purpose of the present disclosure is to make it possible to determine whether an anomaly has occurred in a section of a device or an optical fiber.　The present disclosure is an optical power supply system comprising: a light source that outputs power supply light to an optical fiber; a plurality of optical nodes that are connected in series to the optical fiber; and an optical tester that transmits test light from the light source side of the optical fiber toward the plurality of optical nodes and detects reflected light of the test light. Each optical node comprises: a photoelectric conversion element that converts the power supply light into electricity; a power storage unit that stores power obtained by conversion by the photoelectric conversion element; an optical switch that switches the output destination of power supply light propagating through the optical fiber from the photoelectric conversion element of the optical node itself to another optical node connected to the optical fiber; a control unit that switches the connection of the optical switch in accordance with an control signal superimposed on the power supply light; and a test light cutting filter that reflects, toward the optical tester, test light which has been output from the optical switch to the photoelectric conversion element.

Description

[Technical Field]

[0001] The present disclosure relates to an optical power supply system that supplies power to a plurality of optical nodes by connecting the optical nodes in series to an optical fiber. [Background technology]

[0002] In optical fiber networks, especially access networks that connect communication equipment installed in communication buildings with user-side communication terminals, optical line switching is frequently performed to connect to new routes or change routes in order to efficiently use the facilities during installation and maintenance. Normally, such work is performed by visiting the site and manually switching the optical fiber connections, but a technology has been proposed that allows optical fiber connections to be switched remotely.

[0003] For example, Non-Patent Documents 1 and 2 propose a method in which, in a system consisting of a power supply control light source installed in a power supply environment such as a central office and one or more optical nodes located remotely, by connecting multiple optical nodes in series to an optical fiber, a single light source can simultaneously realize the functions of optical power supply and control of multiple optical switches included in the optical node. This optical node is installed in an optical fiber network and performs mutual connection and switching on an optical fiber basis. [Prior art documents] [Non-patent literature]

[0004] [Non-Patent Document 1] "Study on remote optical path switching nodes for future optical access networks," IEICE General Conference 2021, B-13-16 [Non-patent document 2] "A Study on Serial Connection Method of Remote Optical Path Switching Nodes", IEICE General Conference 2022, B-13-28 Summary of the Invention [Problem to be solved by the invention]

[0005] In an optical fiber network consisting of optical nodes, if an abnormality such as a failure occurs in either the optical fiber connecting the optical nodes or the optical node, it is necessary to detect the abnormality and lead to recovery. However, there are currently no methods or systems for detecting abnormalities in an optical fiber network consisting of optical nodes.

[0006] Furthermore, assuming that recovery will be carried out by visiting outdoor facilities and efficiently restoring abnormalities, it is necessary to accurately isolate the location remotely, as it is necessary to avoid rework when dispatching personnel to perform recovery (such as entering manholes multiple times, resulting in incorrect dispatch positions), such as determining the distance of abnormalities in each part of the optical node or the optical cable.Furthermore, optical nodes are powered by optical power, but they must be powered with low power consumption, so a method and system for detecting abnormalities using only the functions currently provided, without adding new sensors for detecting abnormalities, is desirable.

[0007] The present disclosure aims to enable remote detection of an abnormality in an optical power supply system that supplies power to a plurality of optical nodes by connecting the optical nodes in series to an optical fiber. [Means for solving the problem]

[0008] The optical power supply system of the present disclosure is an optical power supply system that supplies power to a plurality of optical nodes by connecting the optical nodes in series to an optical fiber, and includes a communication device and optical nodes of the present disclosure.

[0009] The communication device of the present disclosure includes: a light source that outputs power supply light to a plurality of optical nodes connected in series to an optical fiber; an optical tester that transmits test light from the light source side of the optical fiber toward the plurality of optical nodes and detects reflected light of the test light; Equipped with determining the location of optical loss using the test waveform obtained by the optical tester; The location of the abnormality is determined based on the location where the optical loss occurs.

[0010] The optical node device of the present disclosure includes: a photoelectric conversion element that converts the power supply light propagated through the optical fiber into electricity; a power storage unit that stores the power converted by the photoelectric conversion element; an optical switch that switches the output destination of the power supply light between a photoelectric conversion element provided in the optical node itself and another optical node connected to the optical fiber; a test light cut filter that reflects the test light output from the optical switch to the photoelectric conversion element; a control unit that switches the connection of the optical switch in accordance with a control signal superimposed on the power supply light, checks the stored voltage value of the power storage unit at regular time intervals, and automatically switches the optical switch to the photoelectric conversion element provided in its own optical node when the stored voltage value of the power storage unit becomes equal to or lower than a certain value; Equipped with.

[0011] The abnormality location detection method of the present disclosure is a method executed by the optical power supply system of the present disclosure, the plurality of optical nodes an optical switch that switches an output destination of the power supply light propagated through the optical fiber between a photoelectric conversion element provided in the optical node itself and another optical node connected to the optical fiber; a test light cut filter that reflects the test light output from the optical switch to the photoelectric conversion element toward the optical tester; Equipped with the control unit provided in any one of the plurality of optical nodes switches the connection of the optical switch in accordance with the control signal superimposed on the power supply light; The test light is reflected by the test light cut filter.

[0012] In the optical power supply system of the present disclosure, the control unit may check the storage voltage value of the storage unit at regular time intervals, and when the storage voltage value of the storage unit falls below a certain voltage value, automatically switch the optical switch to the photoelectric conversion element provided in its own optical node.

[0013] In the optical power supply system of the present disclosure, a point where an optical loss occurs is determined using a test waveform obtained by the optical tester, and information on the distance of the optical fiber from the optical tester to each of the plurality of optical nodes is referenced, and the point where the optical loss occurs is compared with the information on the distance. (i) If an abnormality occurs in any of the plurality of optical nodes, which optical node has the abnormality? (ii) If an abnormality occurs in any section between the optical nodes of the plurality of optical nodes, which section of the optical fiber has the abnormality? The determination may be made as follows.

[0014] using a control signal superimposed on the power supply light, for each of the plurality of optical nodes, sequentially starting from the node closest to the light source, to switch the optical switch to the photoelectric conversion element provided in the optical node itself; If the test light is not reflected at the optical node that has switched to the photoelectric conversion element, it may be determined that an abnormality has occurred in the optical node.

[0015] In the optical power supply system of the present disclosure, the test light may be transmitted from the optical tester when there is no response from any of the plurality of optical nodes to the control signal superimposed on the power supply light, or periodically. In this case, if no optical loss occurs in the test waveform obtained by the optical tester, the optical switch may be switched to the photoelectric conversion element provided in the optical node itself, for each of the multiple optical nodes, sequentially starting from the node closest to the light source.

[0016] The above disclosures can be combined as much as possible. [Effects of the Invention]

[0017] According to the present disclosure, in an optical power supply system in which power is supplied to a plurality of optical nodes by connecting the optical nodes in series to an optical fiber, it is possible to detect an abnormality from a distance. [Brief explanation of the drawings]

[0018] [Figure 1] 1 shows an example of a basic configuration of an optical power supply system. [Figure 2] 1 is an example of a functional block of an optical power supply system. [Figure 3] 1 illustrates an example of a system configuration of an optical power supply system according to the present disclosure. [Figure 4] 1 illustrates an example of a system configuration of an optical power supply system according to the present disclosure. [Figure 5] 1 illustrates an example of a system configuration of an optical power supply system according to the present disclosure. [Figure 6] FIG. 1 is a flow diagram illustrating an example of an abnormality detection method according to the present disclosure. DETAILED DESCRIPTION OF THE INVENTION

[0019] Hereinafter, embodiments of the present disclosure will be described in detail with reference to the drawings. Note that the present disclosure is not limited to the embodiments shown below. These implementation examples are merely illustrative, and the present disclosure can be implemented in various forms with various modifications and improvements based on the knowledge of those skilled in the art. Note that components with the same reference numerals in this specification and drawings indicate the same components.

[0020] (Basic configuration example of an optical power supply system) 1 shows an example of the basic configuration of an optical power supply system. The optical power supply system of the present disclosure includes a power supply control light source 11 that outputs power supply light to a power supply and control optical fiber 30, and a plurality of optical nodes 20 connected in series to the power supply and control optical fiber 30. In this embodiment, for ease of understanding, an example in which only three optical nodes 20 are connected is shown, but the number of optical nodes 20 connected in series can be any number equal to or greater than two.

[0021] Each optical node 20 an optical coupler 21 that branches the power supply light into two; a photoelectric conversion element 23B that converts the power supply light into electricity; a power storage unit 26 that stores the power converted by the photoelectric conversion element 23B; a 1×2 optical switch 22 that switches the output destination of the power supply light propagated through the power supply / control optical fiber 30 between a photoelectric conversion element 23B provided in the optical node 20 itself and another optical node 20 connected to the power supply / control optical fiber 30; a photoelectric conversion element 23C for receiving a control signal superimposed on the power supply light; a control unit 25 that switches the connection of the 1×2 optical switch 22 in accordance with the control signal received by the photoelectric conversion element 23C; Equipped with. Hereinafter, when there is no need to distinguish between the photoelectric conversion elements 23B and 23C, they will be referred to as the photoelectric conversion elements 23.

[0022] The optical power supply light emitted from a power supply control light source 11 located remotely, such as within a communications building, is sequentially connected to multiple optical nodes 20 via a single power supply / control optical fiber 30. Each optical node 20 is equipped with a 1×2 optical switch 22, which switches whether the transmitted optical power supply light is taken in by the photoelectric conversion element 23 of the respective optical node 20 or sent to the subsequent optical node 20. The switching of this 1×2 optical switch 22 is performed by a control signal superimposed on the optical power supply light. In this way, the 1×2 optical switch 22 is switched so that the power supply control light source 11 and each optical node 20 simultaneously form a route that allows one-to-one communication by the control signal.

[0023] A more detailed configuration of the optical power supply system is shown in Figure 2. A control signal is superimposed on optical power supply light from a power supply control light source 11 in a communication building in an optical modulator 12, and the signal is transmitted to an optical node 20. An upstream control signal from the optical node 20 is output from a circulator 13 to an optical receiver 14, where it is received. A controller PC15 outputs the control signal to the optical modulator 12, which then superimposes the control signal on the power supply light. The optical receiver 14 outputs the received signal to the controller PC15. As a result, the controller PC15 transmits and receives control signals to and from each optical node 20.

[0024] The control unit 25 of the optical node 20 receives the control signal superimposed on the optical power supply light and controls the 1×2 optical switch 22 as well as other devices 41 and 42. The optical node 20 also converts the optical power supply light into electricity using the photoelectric conversion element 23B, and stores the electricity in the device power storage unit 26D and the control unit power storage unit 26C. The control unit 25 of the optical node 20 and each of the devices 41 and 42 are driven by this stored electricity. Herein, in the present disclosure, when there is no need to distinguish between the device power storage unit 26D and the control unit power storage unit 26C, they are referred to as power storage units 26.

[0025] The control unit 25 and devices 41 and 42 cannot be controlled or driven when the voltage drops below a driveable value. The configuration in FIG. 1 includes multiple optical nodes 20, and each of the optical nodes 20 can perform optical power feeding by sequentially switching the 1×2 optical switches 22. For this reason, the optical power feeding system disclosed herein operates on the premise that a certain amount of power is always stored in the power storage unit 26 provided in each optical node 20, so that the control unit 25 provided in each optical node 20 can be kept in a driveable state.

[0026] In addition, in order to ensure that the power storage unit 26 of each optical node 20 always maintains a constant amount of stored power, the optical power supply system of the present disclosure uses a control signal from the power supply control light source 11 to inquire and confirm the amount of stored power in the power storage unit 26 of the optical node 20 at any time.

[0027] The optical power supply system of the present disclosure further includes an optical tester (optical pulse tester 17 shown in FIG. 4) and a test light cut filter (reference numeral 28 shown in FIGS. 4 and 5) in addition to the optical power supply system shown in FIGS. 1 and 2. In this embodiment, an example using the optical pulse tester (reference numeral 17 shown in FIG. 4) is shown as an example of the optical tester. The optical pulse tester (reference numeral 17 shown in FIG. 4) transmits test light from the power supply control light source 11 side of the power supply / control optical fiber 30 toward multiple optical nodes 20 and detects reflected light of the test light. The test light cut filter (reference numeral 28 shown in FIGS. 4 and 5) reflects the test light output from the 1×2 optical switch 22 to the photoelectric conversion element 23B toward the pulse light tester 17.

[0028] The optical power supply system of the present disclosure executes the abnormality detection method of the present disclosure. For example, in the abnormality detection method of the present disclosure, the control unit 25 switches the connection of the 1×2 optical switch 22 in accordance with a control signal superimposed on the power supply light, and reflects the test light to the test light cut filter 28.

[0029] The optical power supply system of the present disclosure includes an optical pulse tester (reference numeral 17 shown in FIG. 4) and a test light cut filter (reference numeral 28 shown in FIGS. 4 and 5), and by executing the abnormality detection method of the present disclosure, when an abnormality occurs in either the power supply / control optical fiber or device section of the serial optical node 20 in an optical fiber network made up of optical nodes 20, it becomes possible to remotely isolate the fault using only the currently provided functions as shown in FIGS. 1 and 2.

[0030] (First embodiment of the invention) A first embodiment of the optical power supply system of the present disclosure will now be described in detail. As already mentioned, each optical node 20 drives the control unit 25 and the devices 41 and 42 within the optical node 20 using the power stored in the power storage unit 26. When each optical node 20 is not receiving optical power supply light, that is, when the 1×2 optical switch 22 is switched to the side of the rear optical node 20, the power stored in the power storage unit 26 decreases over time due to natural discharge, etc.

[0031] In this embodiment, as shown in FIG. 3, when any optical node 20 is not receiving optical power supply light, the control unit 25 checks the stored voltage value of the power storage unit 26 at regular time intervals, and when the voltage value falls below a certain value, the control unit 25 automatically switches the 1×2 optical switch 22 in a direction that allows the optical node 20 to receive light.

[0032] As a result, even if the state in which any optical node 20 cannot receive optically powered light continues and the voltage value of the power storage unit 26 of any optical node 20 drops further, causing the control unit 25 to become unable to operate due to the voltage drop or the 1x2 optical switch 22 to become unable to operate, the 1x2 optical switch 22 of the optical node 20 in question will be switched to a direction in which it can receive light.

[0033] (Second embodiment of the invention) A second embodiment of the optical power supply system of the present disclosure will now be described in detail. In the first embodiment, a server 16 is installed that cooperates with a controller PC 15 that operates a power supply control light source 11, as shown in Fig. 3. This server 16 cooperates with the controller PC 15 and is characterized by storing information regarding the connection order of multiple optical nodes 20 from the power supply control light source 11 to a single optical fiber.

[0034] Each optical node 20 is assigned a unique identifier, and the order in which they are connected is held by the server 16. In the example of Fig. 3, the optical node 20#1 is the identifier, and the server 16 stores that the optical nodes 20 are connected to the power supply and control optical fiber 30 in the order of optical node 20#1, optical node 20#2, and optical node 20#3.

[0035] (Third Mode for Carrying Out the Invention) A third embodiment of the optical power supply system of the present disclosure will be described in detail. In the second embodiment, as shown in Fig. 4, a configuration is adopted in which pulse test light of a specific test wavelength can be added to the power supply / control optical fiber 30 from the upper side of the optical node 20#1, such as in a communications building, by an optical pulse tester 17. The optical node 20 also includes a test light cut filter 28, such as an FBG (fiber grating), that blocks the light of this test wavelength by reflecting it.

[0036] A more detailed configuration of the optical power supply system is shown in Fig. 5. As shown in Fig. 5, a test light cut filter 28 is inserted between the 1 × 2 optical switch 22 and the photoelectric conversion element 23B in the optical node 20. With this configuration, the pulse test light reaches the 1 × 2 optical switch 22. When the inserted pulse test light reaches the test light cut filter 28, a reflection point is confirmed at the position of the test light cut filter 28 in the pulse test waveform, making it possible to confirm that the pulse test light has arrived.

[0037] As shown in FIG. 4, the server 16, which cooperates with the controller PC 15 that operates the power supply control light source 11, is characterized by having data on the power supply control light source 11 and the nearest optical node 20#1, and the optical fiber length (line length) between each optical node 20.

[0038] As described above, when a problem occurs in the transmission and reception of control signals between the power supply control light source 11 and any optical node 20, such as no response from the optical node 20, the optical pulse test is performed on the power supply and control optical fiber 30 by the optical pulse tester 17. If the location of optical loss is confirmed in the test waveform, the server 16 measures the distance between the power supply control light source 11 and the location of the optical loss. By comparing the distance to the location of the loss measured by the optical pulse tester 17 with the connection order of the optical nodes 20 managed by the server 16 and the line length of the power supply and control optical fiber 30, it is possible to determine which optical node 20 or the section of the optical fiber between which optical nodes 20 the location of the optical loss occurred.

[0039] (Fourth Mode for Carrying Out the Invention) A fourth embodiment of the optical power supply system of the present disclosure will be described in detail. In the third embodiment, the server 16 executes the isolation flow shown in FIG. 6. The server 16 can also be realized by a computer and a program, and the program can be recorded on a recording medium or provided via a network. A configuration can also be adopted in which the controller PC 15 executes the program, thereby providing the functions of the server 16 to the controller PC 15.

[0040] In this embodiment, three optical nodes 20 are connected. As already described, an optical pulse test is performed using the optical pulse tester 17 (S101), and the presence or absence of an optical loss location is confirmed using the test waveform obtained from the optical pulse test (S102). If an optical loss location is confirmed, it is compared with data stored in the server 16 (S103) to detect an abnormal location. If no optical loss location is confirmed, confirmation is performed in order, starting with the optical node 20#1 closest to the power supply control light source 11.

[0041] First, a control signal is used to instruct the optical node 20#1 to switch the 1×2 optical switch 22 to the light-receiving side of the optical node 20#1 (S104). Even if the power storage unit 26 of the optical node 20#1 does not have enough stored power to respond at this point, if the optical node 20#1 is operating normally, the 1×2 optical switch 22 should have been automatically switched to the direction in which the optical node 20#1 can receive light, due to the characteristics described in the first embodiment.

[0042] Next, an optical pulse test is performed (S105), and the presence or absence of optical loss locations is confirmed using the test waveform obtained from the optical pulse test (S106). If an optical loss location is confirmed (loss location detected in S106), the data is compared with the data stored in server 16 (S103) to detect the abnormal location. If no optical loss location is confirmed (no loss location detected in S106), the reflection point of optical node 20#1 is confirmed using the test waveform (S107).

[0043] Here, if the 1×2 optical switch 22 has been switched normally in a direction that allows its own optical node 20 to receive light, the reflection of the test light cut filter 28 installed behind the 1×2 optical switch 22 should be confirmed at the far end of the test waveform (reflection point present in S107). If a reflection point cannot be confirmed (no reflection point present in S107), it means that the 1×2 optical switch 22 has not been switched in a direction that allows its own optical node 20 to receive light. For this reason, it is determined that there is a possibility that some kind of abnormality has occurred in optical node 20#1. If a reflection point can be confirmed, the 1×2 optical switch 22 of optical node 20#1 is determined to be normal, so next the optical node 20#2 is checked.

[0044] The 1×2 optical switch 22 of optical node 20#1 is instructed to switch to the rear side of optical node 20#1 (S108). Also, the 1×2 optical switch 22 of optical node 20#2 is instructed to switch to the light input side of optical node 20#2 (S108). After this, an optical pulse test is performed (S109), and similarly to steps S106 and S107, the location of optical loss is confirmed (S110) and the reflection points within optical node 20#2 are confirmed (S111). If there is no abnormality in optical node 20#2 (reflection points are confirmed in S111), the abnormality is then isolated in optical node 20#3 using a similar method (S112 to S115).

[0045] (Fifth Mode for Carrying Out the Invention) A fifth embodiment of the optical power supply system of the present disclosure will be described in detail. In the fourth embodiment, the event that triggers the start of the isolation flow is the occurrence of a trouble in the control system of the optical node 20, such as no response from the optical node 20 in the exchange of control communication such as an inquiry and response about the amount of stored power between the power supply control light source 11 and each optical node 20, and the isolation flow is started irregularly.

[0046] (Sixth Mode for Carrying Out the Invention) A sixth embodiment of the optical power supply system of the present invention will be described in detail. In the fourth embodiment, the event that triggers the start of the isolation flow is, for example, periodic maintenance, etc., and the isolation flow is periodically executed when a certain time has elapsed since the previous execution of the isolation flow. [Explanation of symbols]

[0047] 11: Power supply control light source 12: Optical modulator 13: Circulator 14: Optical receiver 15: Controller PC 16: Server 17: Optical pulse tester 20: Optical node 21: Optical coupler 22:1 x 2 optical switch 23, 23B, 23C: Photoelectric conversion element 25: Control unit 26: Power storage unit 26D: Device power storage unit 26C: Power storage unit for control unit 27: Boost circuit 41, 42: Device

Claims

1. a light source that outputs power supply light to the optical fiber; a plurality of optical nodes connected in series to the optical fiber; an optical tester that transmits test light from the light source side of the optical fiber toward the plurality of optical nodes and detects reflected light of the test light; Equipped with Each of the plurality of optical nodes a photoelectric conversion element that converts the power supply light into electricity; a power storage unit that stores the power converted by the photoelectric conversion element; an optical switch that switches an output destination of the power supply light propagated through the optical fiber between a photoelectric conversion element provided in the optical node itself and another optical node connected to the optical fiber; a control unit that switches the connection of the optical switch in accordance with a control signal superimposed on the power supply light; a test light cut filter that reflects the test light output from the optical switch to the photoelectric conversion element toward the optical tester; An optical power supply system comprising:

2. the control unit checks the stored voltage value of the power storage unit at regular time intervals, and when the stored voltage value of the power storage unit becomes equal to or lower than a certain voltage value, automatically switches the optical switch to the photoelectric conversion element provided in its own optical node; The optical power supply system according to claim 1 .

3. a light source that outputs power supply light to the optical fiber; a plurality of optical nodes connected in series to the optical fiber; an optical tester that transmits test light from the light source side of the optical fiber toward the plurality of optical nodes and detects reflected light of the test light; Equipped with In the plurality of optical nodes, a photoelectric conversion element converting the power supply light into electricity; a power storage unit that stores the power converted by the photoelectric conversion element; A method performed by an optical power supply system, comprising: the plurality of optical nodes an optical switch that switches an output destination of the power supply light propagated through the optical fiber between a photoelectric conversion element provided in the optical node itself and another optical node connected to the optical fiber; a test light cut filter that reflects the test light output from the optical switch to the photoelectric conversion element toward the optical tester; Equipped with a control unit provided in any one of the plurality of optical nodes switches the connection of the optical switch in accordance with a control signal superimposed on the power supply light; The test light is reflected by the test light cut filter. Anomaly detection method.

4. determining the location of optical loss using the test waveform obtained by the optical tester; By referring to information about the distance of the optical fiber from the optical tester to each of the plurality of optical nodes and comparing the point where the optical loss occurred with the information about the distance, (i) If an abnormality occurs in any of the plurality of optical nodes, which optical node has the abnormality? (ii) if an abnormality occurs in any section between the optical nodes of the plurality of optical nodes, which section of the optical fiber has the abnormality; Make a determination of The method for detecting an abnormality according to claim 3 .

5. using a control signal superimposed on the power supply light, for each of the plurality of optical nodes, sequentially starting from the node closest to the light source, to switch the optical switch to the photoelectric conversion element provided in the optical node itself; If the test light is not reflected by the optical node that has been switched to the photoelectric conversion element, it is determined that an abnormality has occurred in the optical node. The abnormality detection method according to claim 4 .

6. transmitting the test light from the optical tester when there is no response from any of the optical nodes to the control signal superimposed on the power supply light, or periodically; If no optical loss occurs in the test waveform obtained by the optical tester, the optical switch is switched to the photoelectric conversion element provided in the optical node in turn for each of the plurality of optical nodes, starting from the node closest to the light source. The abnormality detection method according to claim 5 .

7. a light source that outputs power supply light to a plurality of optical nodes connected in series to an optical fiber; an optical tester that transmits test light from the light source side of the optical fiber toward the plurality of optical nodes and detects reflected light of the test light; Equipped with Using the test waveform obtained by the optical tester, a point where an optical loss occurs and a reflection point at a test light cut filter inserted in a subsequent stage of an optical switch for node switching provided in the plurality of optical nodes are determined; determining the normality of the plurality of optical nodes based on the presence or absence of the reflection points; determining an abnormality location based on the location where the optical loss occurred; Communication equipment.

8. a photoelectric conversion element that converts the power supply light propagated through the optical fiber into electricity; a power storage unit that stores the power converted by the photoelectric conversion element; an optical switch that switches the output destination of the power supply light between a photoelectric conversion element provided in the optical node itself and another optical node connected to the optical fiber; a test light cut filter that reflects the test light output from the optical switch to the photoelectric conversion element; a control unit that switches the connection of the optical switch in accordance with a control signal superimposed on the power supply light, checks the stored voltage value of the power storage unit at regular time intervals, and automatically switches the optical switch to the photoelectric conversion element provided in its own optical node when the stored voltage value of the power storage unit becomes equal to or lower than a certain value; An optical node device comprising:

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