JP2009296336A - Optical receiver, remote monitoring device and remote monitoring program - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To perform line monitoring of an optical network with high accuracy, with in-services and at low cost. <P>SOLUTION: An optical receiver for measuring light receiving power of a received optical signal to determine abnormality of an optical network to be connected is provided with a light-receiving power measuring means for measuring light receiving power by fixed time, and a light-receiving power comparing and determining means for receiving the light-receiving power measured by the light-receiving power measuring means by fixed time, and determining an abnormality to output an abnormality determination signal, when it detects the abnormality by the prescribed number of times in succession by comparing each light-receiving power with a threshold, or when it detects the abnormality by a specified number of times, with respect to the number of times by comparing each light-receiving power with the threshold. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to an optical receiver, a remote monitoring device, and a remote monitoring program used for optical line monitoring of an optical network having a PON (Passive Optical Network) configuration.

  With the rapid spread of optical networks, provision of various services to users has begun, but it is important to monitor the line quality of optical networks between stations and users' homes in order to provide stable services to users. It has become.

  When digital baseband signals are transmitted when providing services, line monitoring is possible by measuring the bit error rate, etc., but when a failure occurs, the cause is a device failure or a failure in the optical line section. Cannot be determined by Further, when an analog signal such as a frequency division multiplexing (FDM) signal is transmitted, there is only a means for monitoring the line by measuring the received light power of the optical receiver.

FIG. 12 shows a configuration example of an optical network having a PON configuration.
In the figure, the optical network has one or more optical transmission devices 12-1 and 12-2 in the station device 11, and the optical signal of each wavelength transmitted from the optical transmission device 12 is processed by the optical wavelength multiplexer / demultiplexer 13. Multiplexed and distributed to a plurality of optical receivers 16 arranged at the user's home via the optical branching unit 14 and the optical line 15. In the optical receiver 16, if there is a received light power in the designed appropriate range, the optical signal is normally received and data is received. Here, in order to measure the received light power value of the optical receiver 16, an operator goes to the place where the optical receiver 16 is installed, and connects the optical power measuring instrument to the optical line instead of the optical receiver 16. It was.

  The optical receiver 16 shown in FIG. 13 detects the received light power detected by the light receiving element 17 by the received light power determination circuit 18, further determines whether or not the received light power exceeds the threshold value, and performs line monitoring. It is a configuration. However, since the condition for detecting the line abnormality is determined by a threshold value set in advance in the received light power determination circuit 18, only uniform line monitoring can be performed. For example, even if the network status changes variously, even if it is normal, avoid instantaneous interruptions and fluctuations (instantaneous fluctuations in the received light level) of optical signals that occur during line switching in actual operation. I can't. Such a change should be recognized as a normal state originally, but is detected as an abnormal state uniformly in the optical receiver 16 equipped with the received light power determination circuit 18 shown in FIG.

Also, in the optical network shown in FIG. 12, when an abnormal location between the station apparatus 11 and the optical receiver 16 in the user's home is specified, the operator receives the optical signals in order from the optical receiver 16 side to the station apparatus 11 side. It was necessary to disconnect the device 16 and the optical branching device 14 from the optical line and connect the optical power measuring device instead to measure the received light power. Meanwhile, the service provision to the user stops.
JP 2000-315969 A JP 2003-298540 A JP 2001-136133 A

Conventionally, when performing line monitoring of an optical network, there have been the following problems.
(1) When measuring the optical line status with the optical power meter, it was necessary to disconnect the optical receiver from the optical line, and in-service line monitoring was not possible.
(2) In conventional optical receivers equipped with a received power detection circuit, the detected received power is simply compared with a threshold to determine whether it is normal or abnormal. And could not be detected flexibly.

(3) It was difficult to monitor the line by measuring the received power of the optical receiver periodically after the line was opened, and it was impossible to grasp the sign of the occurrence of the line abnormality.
(4) When the received light power of the optical receiver is measured, an operator's work is required, which increases the cost.
(5) In an optical network having a PON structure that branches in one or more stages, it takes time to determine the location of a line error, and a wide range of service outages below the branch stage may occur.

  An object of the present invention is to provide an optical receiver, a remote monitoring device, and a remote monitoring program capable of accurately performing in-service and low-cost line monitoring of an optical network.

  According to a first aspect of the present invention, there is provided an optical receiver that measures received light power of an optical signal to be received and determines an abnormality of an optical network to be connected. When the received light power measured at regular intervals is input by the means and an abnormality is detected a predetermined number of times continuously by comparing each received light power and the threshold value, or the number of times specified for the number of comparisons between each received light power and the threshold value And a received light power comparison / determination unit that determines that an abnormality is detected and outputs an abnormality determination signal when the abnormality is detected.

  The optical receiver according to the first aspect of the invention comprises storage means for storing received light power and abnormality determination signals measured at regular intervals by the received light power measuring means in time series. Furthermore, a communication means for transmitting received light power information or an abnormality determination signal as a control signal to an external remote monitoring device is provided. The communication unit has a function of receiving a control signal transmitted from the remote control device and changing a threshold value or abnormality determination condition of the received light power comparison determination unit.

  A second aspect of the invention is the remote monitoring device described above, wherein communication means for transmitting / receiving a control signal to / from the optical receiving device, an abnormality determination signal transmitted from the optical receiving device is received, and each optical receiving device in the optical network An abnormality occurrence location estimating means for estimating an abnormality occurrence location of the optical network from the connection status and the connection status of the optical receiver that has transmitted the abnormality determination signal.

  A third aspect of the invention is the remote monitoring device described above, wherein communication means for transmitting / receiving a control signal to / from the optical receiver, received light power comparison / determination means moved from the optical receiver, and received light power transmitted from the optical receiver. The received light power comparison / determination means performs abnormality determination, and from the abnormality determination signal, the connection state of each optical receiver in the optical network, and the connection state of the optical receiver that transmitted the abnormality determination signal, the optical An abnormality occurrence location estimating means for estimating an abnormality occurrence location of the network.

  According to a fourth aspect of the present invention, in the remote monitoring program for the remote monitoring device according to the second aspect, the optical network includes at least one optical transmission device and a plurality of optical reception devices according to claim 5 in at least one stage. When the abnormality determination signal transmitted from the first optical receiving device connected to the remote monitoring device is input, the abnormality occurrence location estimating means is connected to the first optical branching device. It is determined whether there is a first optical branching device above the optical receiving device, and if there is no optical branching device, it is estimated that there is an abnormality in a path connected from the optical transmitting device to only the first optical receiving device. If there is a first optical branching unit, the second step of acquiring the abnormality determination state of all the optical receiving devices under the first step, and the optical receiving devices under the first optical branching device are all If not abnormal, the first optical receiver and the first optical branch If the third step of estimating that there is an abnormality in the path between and the optical receivers under the first optical branching device are all abnormal, it is determined whether or not there is a second higher-order optical branching device. If there is no optical branching device, the fourth step of estimating that there is an abnormality in the path from the optical transmission device to the first optical branching device, and if there is the second optical branching device, all of the light under its control The fifth step of acquiring the abnormality determination state of the receiving device and between the first optical branching device and the second optical branching device unless all of the optical receiving devices under the second optical branching device are abnormal. If all the optical receivers under the control of the second optical branching unit and the sixth step for estimating the path of the second optical branching unit are abnormal, the second optical branching unit is replaced with the next higher optical branching unit. The steps 6 to 6 are repeated.

  According to a fifth aspect of the present invention, in the remote monitoring program for the remote monitoring device according to the third aspect, the optical network moves at least one optical transmission device and the received light power comparison and determination means according to claim 6 to the remote monitoring device. The plurality of optical receivers are connected through at least one or more stages of optical branching units, and the received light power comparison / determination means performs abnormality determination based on the received light power information transmitted from the optical receiver. When an abnormality is determined, an abnormality determination signal is output, and the abnormality occurrence location estimation unit receives the abnormality determination signal output by the received light power comparison determination unit based on the received light power information of the first optical receiver. Sometimes, it is determined whether or not the first optical branching device is above the first optical receiving device, and if there is no optical branching device, the path connected from the optical transmitting device only to the first optical receiving device Estimating that the first is abnormal If there is a step and the first optical branching device, the second step of acquiring the abnormality determination state of all the optical receiving devices under the first optical branching device, and all the optical receiving devices under the first optical branching device are abnormal. Otherwise, if the third step for estimating an abnormality in the path between the first optical receiving device and the first optical branching device and all the optical receiving devices under the first optical branching device are abnormal A fourth step of determining whether or not there is a higher-order second optical branching device, and if there is no such optical branching device, estimating a path abnormality from the optical transmission device to the first optical branching device; If there is a second optical splitter, the fifth step of acquiring the abnormality determination state of all the optical receivers under its control, and if all of the optical receivers under the second optical splitter are not abnormal, A sixth step of estimating an abnormality in the path between the first optical splitter and the second optical splitter; If splitter optical receiver under the all abnormal, repeated sixth step from the fourth step by rereading the second optical splitter into a single higher optical divider.

  The present invention can determine the line status of an optical network in-service from the received power of the optical receiver. In addition, it is possible to monitor the temporal change of the received light power, and it is possible to predict the occurrence of an abnormality in advance. Furthermore, by adding a communication function to the optical receiving device, the received light power of the optical receiving device can be monitored from the remote monitoring device, and the optical network can be easily monitored.

  Further, according to the present invention, by monitoring the received light power of all the optical receivers connected to the optical network having the PON configuration with the remote monitoring device, it is possible to easily identify the location where the abnormality has occurred.

(First embodiment of optical receiver)
FIG. 1 shows a first embodiment of the optical receiver of the present invention.
In the figure, the optical receiver of this embodiment measures the received light power detected by the light receiving element 17 by the received light power measuring circuit 21 and inputs the measured received light power to the received light power comparison / determination circuit 22. The received light power comparison / determination circuit 22 compares the received light power measured by the received light power measurement circuit 21 with a threshold value every predetermined time, and detects an abnormal state when the received light power is below or above the threshold value. However, once an abnormality is detected, the optical line is not abnormal, and it is the first time that anomaly detection has been detected a specified number of times, or when the received light power comparison judgment operation has been performed a specified number of times. The optical line is determined as abnormal and a corresponding abnormality determination signal is output.

  The threshold value used for the comparison of the received light power may be appropriately set by the received light power comparison / determination circuit 22 based on the received light power value when the line is opened, for example.

The received light power measurement circuit 21 may be configured to measure a direct current component of an electrical signal converted from an optical signal by the light receiving element 17 and convert it into received light power, for example. When the relationship between the photocurrent I and the received light power P is the Planck constant h, the optical signal frequency ν, the electronic charge q, and the electronic efficiency η,
P = (hν / q) · (I / η)
It becomes.

FIG. 2 shows an application example of the first embodiment of the optical receiver of the present invention.
In the figure, as shown in FIG. 12, when a wavelength multiplexed optical signal obtained by wavelength multiplexing optical signals transmitted from a plurality of optical transmitters 12 is input to the optical receiver, the optical wavelength separator 23 outputs each wavelength. After demultiplexing into optical signals, light is received by the corresponding receiving elements 17, and abnormality determination processing is performed according to the configuration and processing procedure shown in FIG.

FIG. 3 shows a processing procedure of the received light power comparison / determination circuit 22.
In FIG. 3 (1), the received light power comparison / determination circuit 22 initializes the abnormality detection count b (S1), and inputs the received light power measured by the received light power measurement circuit 21 every predetermined time (for example, 30 milliseconds) ( S2), the received light power is compared with the threshold value (S3). If the received light power is within the threshold range and the optical line is determined to be normal, the process returns to step S1. When the received light power exceeds the threshold range and an abnormal state is detected, the abnormality detection count b is counted (S4), and the abnormality detection count b is compared with the specified count B (S5). If the abnormality detection count b is less than the specified count B, the process returns to step S2, and the received light power is input at regular intervals to continue the comparison with the threshold value. On the other hand, when the abnormality detection count b reaches the specified count B, an abnormality determination signal is output (S6). Thereby, it can be determined as an optical line abnormality only when the abnormality detection reaches the specified number of times B continuously.

  In FIG. 3 (2), the received light power comparison / determination circuit 22 initializes the received light power measurement number a and the abnormality detection number b (S11), and the received light power measurement circuit 21 performs measurement every predetermined time (for example, 30 milliseconds). While receiving the received light power, the received light power measurement count a is counted (S12), and the received light power is compared with the threshold value (S13). If the received light power is within the threshold range and the optical line is determined to be normal, the process returns to step S12. When the received light power exceeds the threshold range and an abnormal state is detected, the abnormality detection count b is counted (S14), and the received power measurement count a is compared with the specified count A (S15). If the received light power measurement number a is less than the prescribed number A, the process returns to step S12, the received light power is input at regular intervals, and the comparison with the threshold value is continued. On the other hand, when the received light power measurement count a reaches the specified count A, the abnormality detection count b counted in step S14 is compared with the specified count B (for example, B = A / 2) (S16). If the abnormality detection count b is less than the specified count B, the process returns to step S1. On the other hand, if the abnormality detection count b reaches the specified count B, an abnormality determination signal is output (S17). As a result, it is possible to determine an optical line abnormality for the first time only when abnormality detection is B times or more for each received power measurement number A.

(Second embodiment of optical receiver)
FIG. 4 shows a second embodiment of the optical receiver of the present invention.
In the figure, the light receiving element 17, the received light power measurement circuit 21 and the received light power comparison / determination circuit 22 constituting the optical receiver of the present embodiment are the same as those in the first embodiment.

  A feature of the present embodiment is that the optical receiver includes a storage medium 24 and stores the received light power value measured by the received light power measurement circuit 21 or the abnormality determination signal output by the received light power comparison determination circuit 22 together with time information in the order of occurrence. To do. By using the information stored in the storage medium 24, it is possible to grasp the temporal change of the optical line state.

  Specifically, an abnormal state can be determined when the amount of change in received light power from an initial state (such as when a line is opened) exceeds a certain value. For example, assuming that the threshold value of the received light power change amount is 5 dB, an abnormal state is determined when the received light power value falls (or rises) by 5 dB from the received light power value in the initial state. As a result, it is possible to detect that an abnormality has occurred in the line because the received light power value was within the allowable range of the optical receiver. In addition, since the received light power value is accumulated in time series, the transition of the received light power value on an arbitrary time axis (for example, one day unit, one month unit) can be easily grasped using the data.

(Third embodiment of optical receiver)
FIG. 5 shows a third embodiment of the optical receiver of the present invention.
In the figure, the light receiving element 17, the received light power measurement circuit 21, the received light power comparison / determination circuit 22 and the storage medium 24 constituting the optical receiver of this embodiment are the same as those in the second embodiment.

  A feature of the present embodiment is that the optical receiving device includes the communication function unit 25 and the received light power value measured by the received light power measurement circuit 21 or the abnormality determination signal output from the received light power comparison determination circuit 22 or the storage medium 24. The accumulated monitoring information is transmitted as a control signal to the remote monitoring device 30 periodically or in accordance with setting conditions. The network in which the communication function unit 25 of the optical receiver transmits the control signal to the remote monitoring device 30 may use the optical network 41 for receiving the service of the optical transmitter (in the case of an optical signal), or another The relay network 42 may be used (in the case of an optical signal or an electrical signal). Alternatively, the remote monitoring device 30 may access the communication function unit 25 of the optical receiver via each network, and the communication function unit 25 may respond to each data. Thereby, the remote monitoring device 30 installed away from the optical receiving device can grasp the state of the optical line connected to the optical receiving device.

  Further, by adding a communication function to the optical receiver, it is possible to control the threshold value of the received light power set in the received light power comparison / determination circuit 22 from the remote monitoring device 30. For example, when a temporary light level fluctuation due to maintenance work or the like is expected, the light level fluctuation is set so as not to be detected abnormally. In addition, when there is a change in loss due to optical line exchange or the like, the threshold value for detecting an abnormality is changed accordingly.

(First embodiment of remote monitoring device)
FIG. 6 shows a first embodiment of the remote monitoring apparatus of the present invention.
Here, in an optical network having a PON configuration using a single optical transmission device 12 and a single optical branching device 14, the status of optical lines connected to a plurality of optical reception devices 16A, 16B, and 16C is remotely monitored. An example of collecting at 30 is shown. The network for transmitting the control signal from each optical receiver to the remote monitoring device 30 uses an optical network for receiving the service of the optical transmitter 12 and is separated by the optical wavelength multiplexer / demultiplexer 13 of the station device 11 to be remote. It may be configured to transmit to the monitoring device 30 or may be configured to be transmitted from each optical receiving device via another relay network (broken line in the figure). In the latter case, the optical wavelength multiplexer / separator 13 of the station apparatus 11 is not necessary.

  Here, the line α is set between the optical receiver 16A and the optical branching unit 14, and the line β is connected between the optical branching unit 14 and the optical wavelength multiplexing / demultiplexing unit 13, so that the optical wavelength multiplexing / demultiplexing unit 13 and the optical transmission unit are transmitted. A line γ is connected to the apparatus 12.

  As shown in FIG. 6 (2), the remote monitoring device 30 includes an optical receiver control signal transmission / reception unit 31, an abnormality occurrence location estimation unit 32, and a monitoring network database 33. The optical receiver control signal transmission / reception unit 31 has a function of transmitting / receiving a control signal including monitoring information collected by the optical receiver 16 to be monitored. In the monitoring network database 33, the optical receiver 16 to be monitored and the optical network configuration are registered. The abnormality occurrence location estimation unit 32 has a function of collating a control signal transmitted from the optical receiver 16 with information in the monitoring network database 33 and estimating an abnormality occurrence location. This will be specifically described below.

  The remote monitoring device 30 collects the received light power values of the monitoring target optical receiving devices 16A, 16B, and 16C. According to each received light power value, for example, an abnormal part can be estimated as follows.

(1) When only the received light power of the optical receiving device 16A is abnormal, the optical receiving device 16A or the line α is estimated as an abnormality occurrence location.
(2) When all the received light power of the optical receivers 16A, 16B, and 16C is abnormal, the optical transmitter 12, optical wavelength multiplexer / separator 13, optical splitter 14, line β, and line γ are detected as abnormal locations. It is estimated that either. Here, the failure of the line α alone is excluded.

  Therefore, for example, when an abnormality is detected in the optical receiving device 16A, it is possible to estimate either (1) or (2) as an abnormal location by acquiring the states of the other optical receiving devices 16B and 16C.

(Second Embodiment of Remote Monitoring Device)
FIG. 7 shows a second embodiment of the remote monitoring apparatus of the present invention.
Here, in an optical network having a PON configuration using a single optical transmission device 12 and a plurality of optical branching devices 14-1 to 14-4, states of optical lines connected to the plurality of optical reception devices 16A to 16I are as follows. An example of collection by the remote monitoring device 30 is shown. The network for transmitting information from each optical receiver to the remote monitoring device 30 uses an optical network for receiving the service of the optical transmission device 12, and is separated by the optical wavelength multiplexer / demultiplexer 13 of the station device 11 for remote monitoring. The structure which transmits to the apparatus 30 may be sufficient, and the structure via another relay network (dashed line in the figure) from each optical receiving apparatus may be sufficient. In the latter case, the optical wavelength multiplexer / separator 13 of the station apparatus 11 is not necessary.

  Here, the line α is set between the optical receiver 16A and the optical branch 14-1, the line β is set between the optical branch 14-1 and the optical branch 14-4, and the optical branch 14-4 A line γ is defined between the optical wavelength multiplexer / demultiplexer 13 and a line σ is defined between the optical wavelength multiplexer / demultiplexer 13 and the optical transmitter 12.

The remote monitoring device 30 collects the received light power values of the optical receiving devices 16A to 16I to be monitored. According to each received light power value, for example, an abnormal part can be estimated as follows.
(1) When only the received light power of the optical receiving device 16A is abnormal, the optical receiving device 16A or the line α is estimated as an abnormality occurrence location.
(2) When the received light power of the optical receivers 16A, 16B, and 16C is abnormal, the optical branching device 14-1 or the line β is estimated as an abnormality occurrence location. Here, the failure of the line α alone is excluded.
(3) When all the received light powers of the optical receivers 16A to 16I are abnormal, the optical transmission device 12, the optical wavelength multiplexer / demultiplexer 13, the optical branching device 14-4, the line σ, and the line γ are detected as the abnormality occurrence points. It is estimated that either. Here, single faults of lines α and β are excluded.

(Third embodiment of remote monitoring device)
FIG. 8 shows a third embodiment of the remote monitoring apparatus of the present invention.
Here, in an optical network having a PON configuration using a plurality of optical transmitters 12-1 and 12-2 and a plurality of optical splitters 14-1 to 14-4, the optical receivers 16A to 16I are connected. An example in which the state of the optical line is collected by the remote monitoring device 30 is shown. The network for transmitting information from each optical receiver to the remote monitoring device 30 uses an optical network for receiving the service of the optical transmission device 12, and is separated by the optical wavelength multiplexer / demultiplexer 13 of the station device 11 for remote monitoring. The structure which transmits to the apparatus 30 may be sufficient, and the structure via another relay network (dashed line in the figure) from each optical receiving apparatus may be sufficient.

  Here, the line α is set between the optical receiver 16A and the optical branch 14-1, the line β is set between the optical branch 14-1 and the optical branch 14-4, and the optical branch 14-4 A line γ is provided between the optical wavelength multiplexer / demultiplexer 13 and a line σ is provided between the optical wavelength multiplexer / demultiplexer 13 and the optical transmitter 12-1, and the optical wavelength multiplexer / demultiplexer 13 and the optical transmitter 12-2 are provided. Is a line ω.

  Further, each optical receiving device can receive each optical signal of the optical transmitting devices 12-1 and 12-2 by the configuration shown in FIG. 2, and the received light power can be monitored for each optical transmitting device. is there. In FIG. 8, a mark is written on the upper right of the optical receiver that receives the optical signal of the optical transmitter 12-1, and a mark is written on the lower right of the optical receiver that receives the optical signal of the optical transmitter 12-2. To distinguish.

The remote monitoring device 30 collects the received light power values of the optical receiving devices 16A to 16I to be monitored. According to each received light power value, for example, an abnormal part can be estimated as follows.
(1) When only the received light power of the optical receiver set to receive the optical signal of the optical transmitter 12-1 is abnormal, the optical transmitter 12-1 or the line σ is estimated as an abnormality occurrence location. .
(2) When only the received light power of the optical receiver set to receive the optical signal of the optical transmitter 12-2 is abnormal, the optical transmitter 12-2 or the line ω is estimated as an abnormality occurrence location. .

  The configuration of the remote monitoring device 30 includes an optical receiver control signal transmission / reception unit 31, an abnormality occurrence location estimation unit 32, and a monitoring network database 33, as shown in FIG. 6 (2). Here, in this embodiment, an example of the configuration of the optical receiver 16 to be monitored and the optical network registered in the monitoring network database 33 is shown in FIG.

(Fourth embodiment of remote monitoring device)
Further, in the network configurations shown in FIGS. 6 to 8, when an abnormality such as a service stop occurs even though the received light power of all the optical receivers is within the designed normal range, the optical transmitter It can be estimated that an abnormality has occurred in the host device connected to the top of the 12 or the line between the host device and the host device.

(Processing procedure of abnormality occurrence location estimation unit 32)
FIG. 9 shows a processing procedure of the abnormality occurrence location estimation unit 32 of the first to fourth embodiments of the remote monitoring device. Here, a description will be given assuming a configuration in which a host device is further added to the optical network shown in FIG.

  In the figure, when an abnormality determination signal is received from the optical receiver (16A) (S21), it is determined whether there are a plurality of optical transmitters (S22). Here, when there are a plurality of optical transmitters, the optical receivers (16A, 16C, 16D, 16E, 16G, 16H) corresponding to one optical transmitter (12-1) are targeted (S23). Next, it is determined whether or not there is an optical branching device above the optical receiving device (16A) (S24). If there is no upper optical branching device, the optical receiving device (16A), between the upper device and the optical receiving device It is estimated that there is an abnormality in any of the lines (σ, γ, β, α) or the optical transmitter (12-1) (S25).

  On the other hand, if there is an optical splitter above the optical receiver, the abnormality determination state of the all-optical receiver (16C) under the optical splitter (14-1) is acquired (S26), and the all-optical receiver is It is determined whether or not it is abnormal (S27). Here, if all the optical receivers are not abnormal together, it is estimated that the optical receiver (16A) that transmitted the abnormality determination signal or the line (α) between the optical transmitter and the optical receiver is abnormal. (S28). If the all-optical receiving apparatus is abnormal, it is further determined whether or not there is an optical branching device at the upper level (S29), and if there is no upper optical branching device, the optical transmitting device (12-1), the optical transmitting device to It is estimated that there is an abnormality in any of the lines (σ, γ, β) between the optical branching units (S30).

  On the other hand, if there is an optical branching device at a higher level, the state of the all-optical receiving device under the optical branching device (14-4) is acquired (S31), and it is determined whether or not the all-optical receiving device is abnormal. (S32). If all the optical receivers are not abnormal, it is estimated that there is an abnormality in the line (β) between the optical splitters (S33). If the all-optical receiving apparatus is abnormal, the process returns to step S29 and repeats the determination and subsequent steps to determine whether or not there is an optical branching device at a higher level.

  With the above processing procedure, it is possible to estimate an abnormal location as illustrated in the network configurations shown in FIGS. The function of the abnormality occurrence point estimation unit 32 can be realized by a computer and a program, and the program can be recorded on a recording medium or provided through a network.

(Fifth embodiment of remote monitoring device)
The optical receiver shown in FIGS. 1 to 5 includes a received light power comparison / determination circuit 22 for determining whether or not the received power in the optical receiver is abnormal, and the remote monitoring device 30 corresponding thereto is shown in FIG. As shown in the configuration, the abnormality determination signal output from the received light power comparison determination circuit 22 is input, and the abnormality determination portion is estimated.

  This embodiment corresponds to a configuration in which the received light power comparison / determination circuit 22 is provided in the remote monitoring device 30 instead of the optical receiving device. Therefore, as shown in FIG. 10, the remote monitoring device 30 of this embodiment receives light in addition to the optical receiver control signal transmission / reception unit 31, the abnormality occurrence location estimation unit 32, and the monitoring network database 33 shown in FIG. 6 (2). A power comparison / determination circuit 22 is provided. The optical receiver control signal transmission / reception unit 31 processes the received light power value inputted at regular intervals as a control signal from the optical receiver by the received light power comparison / determination circuit 22. The received light power comparison / determination circuit 22 executes the processing procedure shown in FIGS. 3 (1) and 3 (2), and outputs an abnormality determination signal to the abnormality occurrence location estimation unit 32 if there is an abnormality for each optical receiver. The abnormality occurrence location estimation unit 32 can estimate an abnormality occurrence location according to the processing procedure shown in FIG. 9 based on the abnormality determination signal output from the received light power comparison determination circuit 22 in the remote monitoring device 30.

The figure which shows 1st Embodiment of the optical receiver of this invention. The figure which shows the application example of 1st Embodiment of the optical receiver of this invention. 5 is a flowchart showing a processing procedure of a received light power comparison determination circuit 22; The figure which shows 2nd Embodiment of the optical receiver of this invention. The figure which shows 3rd Embodiment of the optical receiver of this invention. The figure which shows 1st Embodiment of the remote monitoring apparatus of this invention. The figure which shows 2nd Embodiment of the remote monitoring apparatus of this invention. The figure which shows 3rd Embodiment of the remote monitoring apparatus of this invention. The flowchart which shows the process sequence of the abnormality occurrence location estimation part 32. FIG. The figure which shows 5th Embodiment of the remote monitoring apparatus of this invention. The figure which shows the example of the monitoring network database. The figure which shows the structural example of the optical network of a PON structure. FIG. 3 is a diagram illustrating a configuration example of an optical receiving device 16.

Explanation of symbols

DESCRIPTION OF SYMBOLS 11 Station apparatus 12 Optical transmitter 13 Optical wavelength multiplexer / separator 14 Optical splitter 15 Optical line 16 Optical receiver 17 Light receiving element 18 Receiving power determination circuit 21 Receiving power measurement circuit 22 Receiving power comparison determination circuit 23 Optical wavelength separator 24 Storage medium 25 Communication function unit 30 Remote monitoring device 31 Optical receiver control signal transmission / reception unit 32 Abnormality location estimation unit 33 Monitoring network database 41 Optical network 42 Relay network

Claims (8)

In the optical receiver that measures the received light power of the optical signal to be received and determines the abnormality of the connected optical network,
Received power measuring means for measuring the received power at regular intervals;
When the received light power measured every predetermined time is inputted by the received light power measuring means and an abnormality is detected continuously a predetermined number of times by comparing each received light power with a threshold value, or the number of comparisons between each received light power and the threshold value. An optical receiving apparatus comprising: a received light power comparison and determination unit that determines an abnormality and outputs an abnormality determination signal when an abnormality is detected a specified number of times. The optical receiver according to claim 1,
An optical receiver characterized by comprising storage means for storing received light power measured by the received light power measuring means at regular intervals and the abnormality determination signal in time series. The optical receiver according to claim 1 or 2,
An optical receiver characterized by comprising communication means for transmitting the received light power information or the abnormality determination signal as a control signal to an external remote monitoring device. The optical receiver according to claim 3.
The optical receiving device, wherein the communication unit has a function of receiving a control signal transmitted from the remote control device and changing a threshold value or an abnormality determination condition of the received light power comparison determination unit. The remote monitoring device according to claim 3 or 4, wherein
Communication means for transmitting and receiving the control signal to and from the optical receiver according to claim 3 or 4,
5. The connection state of each optical receiving device in the optical network that receives the abnormality determination signal transmitted from the optical receiving device according to claim 3 or 4, and the connection of the optical receiving device that transmits the abnormality determining signal. An abnormality occurrence location estimating means for estimating an occurrence location of an abnormality in the optical network from the state. The remote monitoring device according to claim 3,
Communication means for transmitting and receiving the control signal to and from the optical receiver according to claim 3;
The received light power comparison and determination means moved from the optical receiver according to claim 3;
4. The received light power information transmitted from the optical receiver according to claim 3 is received, an abnormality is determined by the received light power comparison and determination means, and the abnormality determination signal and connection of each optical receiver in the optical network are determined. A remote monitoring device comprising: an abnormality occurrence location estimating means for estimating an abnormality occurrence location of the optical network from a status and a connection status of the optical receiving device that has transmitted the abnormality determination signal. In the remote control program of the remote monitoring apparatus according to claim 5,
The optical network has a configuration in which at least one optical transmission device and a plurality of optical reception devices according to claim 5 are connected via at least one or more optical branching devices,
The abnormality occurrence location estimation means receives the abnormality determination signal transmitted from the first optical receiver connected to the remote monitoring device,
It is determined whether or not there is a first optical branching device above the first optical receiving device. If there is no optical branching device, a path connected from the optical transmitting device to only the first optical receiving device is determined. A first step of estimating an anomaly;
If there is the first optical branching unit, a second step of acquiring abnormality determination states of all optical receiving devices under the first optical branching unit;
A third step of estimating that the path between the first optical receiver and the first optical splitter is abnormal if all of the optical receivers under the first optical splitter are not abnormal; ,
If all of the optical receiving devices under the first optical branching device are abnormal, it is determined whether or not there is a second higher optical branching device. If there is no optical branching device, the optical transmitting device A fourth step of estimating an abnormal path to the first optical splitter;
If there is the second optical branching device, a fifth step of acquiring abnormality determination states of all the optical receiving devices under the second optical branching device;
A sixth step of estimating an abnormality in a path between the first optical branching device and the second optical branching device if all of the optical receiving devices under the second optical branching device are not abnormal; ,
If all of the optical receiving devices under the second optical branching device are abnormal, the second optical branching device is replaced with the next higher optical branching device, and the fourth to sixth steps are repeated. A remote monitoring program characterized by that. In the remote control program of the remote monitoring apparatus according to claim 6,
The optical network includes at least one optical transmitter, and a plurality of optical receivers in which the received light power comparison / determination means according to claim 6 is relocated to the remote monitoring device. Configuration connected through
The received light power comparison determination means performs an abnormality determination based on information on the received light power transmitted from the optical receiver, and outputs the abnormality determination signal when determined to be abnormal,
The abnormality occurrence location estimating means, when the received light power comparison determination means inputs the abnormality determination signal output based on the information of the received light power of the first optical receiver,
It is determined whether or not there is a first optical branching device above the first optical receiving device. If there is no optical branching device, a path connected from the optical transmitting device to only the first optical receiving device is determined. A first step of estimating an anomaly;
If there is the first optical branching unit, a second step of acquiring abnormality determination states of all optical receiving devices under the first optical branching unit;
A third step of estimating that the path between the first optical receiver and the first optical splitter is abnormal if all of the optical receivers under the first optical splitter are not abnormal; ,
If all of the optical receiving devices under the first optical branching device are abnormal, it is determined whether or not there is a second higher optical branching device. If there is no optical branching device, the optical transmitting device A fourth step of estimating an abnormal path to the first optical splitter;
If there is the second optical branching device, a fifth step of acquiring abnormality determination states of all the optical receiving devices under the second optical branching device;
A sixth step of estimating an abnormality in a path between the first optical branching device and the second optical branching device if all of the optical receiving devices under the second optical branching device are not abnormal; ,
If all of the optical receiving devices under the second optical branching device are abnormal, the second optical branching device is replaced with the next higher optical branching device, and the fourth to sixth steps are repeated. A remote monitoring program characterized by that.

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