JPH09196810A - Optical fiber line monitoring device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an optical fiber line monitoring device which is easy to locate the place of failure. SOLUTION: The optical fiber line monitoring device is equipped with a plurality of light branching modules 10 in which a photo-coupler 11 is installed, a coated fiber selector 20 to make photo-coupling of a branched coated fiber 12 branched from each photo-coupler 11 selectively with a master side optical fiber 21, and a tester 30 which makes a test beam of light incident on and emitted from the master side fiber 21. At least one of the coated fiber selector 20 and tester 30 is composed of a plurality of attachable/detachable packages A, and each package A is equipped with failure sensors 23a, 24a... to sense the failed condition in the package. In case where any package goes in failure, the sensors 23a, 24a... installed in the package part, where the failure is generated, can detect the place of failure and failed condition.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical fiber line monitoring device for monitoring an optical fiber line in an optical communication system, and more particularly to an optical fiber line monitoring device having a self-diagnosis function.

[0002]

2. Description of the Related Art As a technique for monitoring an optical fiber line in an optical communication system, for example, Japanese Patent Laid-Open No. 63-1604.
No. 36 publication, OTDR (Optical Time Domai
n Reflectometer method is widely known. The OTDR method is an application of a pulse tester, which is a conventional method for detecting a trouble point in a coaxial cable, to optical communication. That is, O
In the TDR method, test light having a narrow pulse width is incident on an optical fiber line, and the test light reflected and propagated at each point in the optical axis direction of the optical fiber line is received at an end on the incident side. The position of the obstacle point of the optical fiber is specified by plotting on the axis.

An example of a conventional optical fiber line monitoring device using the OTDR method is "JOURNAL OF LIGHTWAVE TECHNOLIO
GY, VOL.12, NO.5, MAY 1994, pp.717-726 ". This monitoring device is provided with a plurality of optical branching modules arranged at the connecting portion of the optical fiber line, and each optical branching module has an optical coupler for inputting and outputting test light to and from the optical fiber line. . The branch cores are branched from each optical coupler, and these branch cores are connected to the core selector. Furthermore, a tester is connected to the core selector via an optical fiber on the master side,
The core wire selector drives to selectively optically couple the master side optical fiber and the branch core wire. In this way, by optically coupling the master side optical fiber and the desired branch core wire, it is possible to input and output the test light to and from the optical fiber line via the optical coupler in which the branch core wire is branched. it can.

[0004]

By the way, in the conventional optical fiber line monitoring device, when the test light is to be incident on all the optical fiber lines having a large number of optical fibers, a large number of optical fiber selectors and pulse test devices are used. It was necessary to prepare a vessel. For this reason, when a failure occurs in any of the devices of the monitoring device, it is difficult to identify the failure location, and the number of cores affected by the failure is large.

An object of the present invention is to solve the above problems and to provide an optical fiber line monitoring device in which a failure location can be easily identified.

[0006]

In order to solve the above problems, an optical fiber line monitoring apparatus according to the present invention comprises a plurality of optical branching modules each having an optical coupler for inputting and emitting test light to and from an optical fiber line. , A core wire selector that selectively optically couples the branched core wire branched from each optical coupler and the master side optical fiber, and a tester that inputs and outputs the test light to and from the master side optical fiber, A monitoring device for monitoring a fault condition in a fiber line, wherein at least one of a core wire selector and a tester is composed of a plurality of detachable package parts, and each package part has a failure in the package part. A failure detection sensor for detecting the state is provided. When a failure occurs in any of the package parts of the monitoring device, the failure detection sensor provided in the package part of the failure part identifies the failure part and detects the failure state.

As described above, since the failure detection sensor provided in each package can identify the failure location,
Repairing failures becomes easy. Further, since the failure state can be detected by the failure detection sensor, it is easy to respond to the failure state. For example, the damage caused by failure is severe,
If parts need to be replaced, the entire package part may be replaced. As described above, the monitoring device can be quickly restored by exchanging the package units.

Here, it is preferable that each package section has a display section for displaying the details of the failure when the failure is detected by the failure detection sensor.

Further, the core wire selector has an optical return member for returning the test light emitted from the master side optical fiber to the master side optical fiber without entering the optical branching module, and a branching branched from each optical coupler. An optical fiber array member for fixing the core wire in parallel is provided, and by introducing the master side optical fiber into the optical fiber array member, one of the optical return member and the plurality of branch core wires, and the master side optical fiber. It is preferable that they are optically coupled.

Further, the communication network connected to the core selector and the tester, and the failure detection signal connected to the communication network and receiving the failure detection signal transmitted from the failure detection sensor to identify the failed package section. It may be further provided with a container.

Furthermore, the failure detector includes a database section accumulating past failure cases, a failure detection signal transmitted from the failure detection sensor, and a failure case read from the database section, based on the failure cases of the package section. And a failure state analysis unit for analyzing the state of.

Furthermore, the failure detector may include a failure state inference unit that infers the failure state of the package unit based on the failure detection signal transmitted from the failure detection sensor.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below with reference to the accompanying drawings. In the description, the same elements will be denoted by the same reference symbols, without redundant description. FIG. 1 is a schematic diagram showing a basic configuration of an optical fiber line monitoring device according to an embodiment of the present invention. As shown in FIG. 1, the optical fiber line monitoring device 1 includes a plurality of optical branching modules 10 each including an optical coupler 11 and each optical coupler 11.
A core wire selector 20 that selects a branch core wire 12 that is optically coupled to an optical fiber (master-side optical fiber) 21 from among the branch core wires 12 that are branched from the optical fiber 21, and causes the test light to enter and exit the optical fiber 21. A tester 30 and a main controller 40 that controls the core wire selector 20 and the tester 30 are provided. Each optical coupler 11 accommodates a part of the optical fiber line 13 so that the test light can enter and exit the optical fiber line 13.

The core wire selector 20 has a plurality of Vs on the upper surface.
An optical fiber array member 22 in which grooves are formed in parallel, and a plurality of branch core wires 12 are housed in each of these V grooves,
The optical fiber array member 22 is provided with an optical switch section 23 which introduces the optical fiber 21 into the V groove to selectively optically couple the branch core wire 12 and the optical fiber 21. Furthermore, the core wire selector 20 includes a control unit 24 that controls the optical switch unit 23, and a power supply unit 25 that supplies power to the optical switch unit 23 and the control unit 24.

Further, the tester 30 includes a light source section 31 for injecting the test light into the optical fiber 21, a light receiving section 34 for receiving the test light emitted from the optical fiber 21, and an S / S output signal from the light receiving section 34. And an AVP (averaging processing circuit) unit 37 for improving N. Further, the tester 30 includes the light source unit 3
1, a control unit 3 for controlling the light receiving unit 34 and the AVP unit 37
8 and a power supply unit 39 that supplies electric power to the light source unit 31, the light receiving unit 34, and the like. A power receiving board 50 that supplies power to the power supply unit 25 is provided outside the core wire selector 20. A distribution board 60 that supplies electric power to the power supply unit 39 is provided outside the tester 30.

Here, the light source section 31 is provided with an LD (laser diode) 32 for emitting test light and a pulse generator 33 for generating a pulse signal. Then, the pulse signal generated by the pulse generator 33 is given to the LD 32, and the LD 32 drives this pulse signal as a control signal, and causes the LD 32 to emit the test light which is the pulse signal. The light receiving unit 34 receives the test light and converts it into an electric signal, and an APD (avalanche diode) 35,
And an amplifier 36 for amplifying the output signal from the APD 35.

Further, the main controller 40 includes a monitor 41 for displaying the test result of the tester 30. That is, the output signal from the AVP unit 37 is given to the main controller 40, and the main controller 40 creates a waveform graph of the distance and the optical loss in the optical fiber line 13 based on this output signal. The waveform graph is displayed on the monitor 41.

Each of the constituent parts 23, 24, ... Of the core wire selector 20 and the tester 30 is constructed as a detachable package part A, and parts can be replaced in units of the package part A. Therefore, when a failure occurs in the optical fiber line monitoring device 1, it is possible to identify the package section A in which the failure has occurred and replace the parts in units of the package section A. Therefore, the system can be quickly restored. Further, each of the components 23, 24, ... Of the optical fiber line monitoring device 1 is provided with a fault detection sensor 23a, 24a ,. Therefore, it is possible to easily identify the package portion A in which the failure has occurred. The failure detection sensors 23a, 24a, ... Are provided with LEDs (display units) 23b, 24b ,. Therefore, it is possible to easily determine a device abnormality, a power supply abnormality, etc. based on the lighting state of the LEDs 23b, 24b ,.

Failure detection sensor 23a of the optical switch section 23
An example is a limit detection sensor. The limit detection sensor is a sensor that functions when the stroke of the optical switch unit 23 is checked when the power of the core wire selector 20 is turned on. The stroke check is performed in the sequence of [home search] → [move to + side limit] → [move to − side limit]. Then, in this sequence, for example, when the + side limit cannot be detected despite continuing to drive the motor, the limit detection sensor determines that the drive system is abnormal.

Further, the failure detection sensor 24a of the control unit 24
One example is an encoder input signal check sensor. The encoder input signal check sensor compares the output signal to the motor with the input signal from the encoder attached to the motor, and compares the optical switch unit 23 or the control unit 2 with each other.
4 is a sensor for detecting abnormality. For example, when the output signal does not match the input signal, the encoder input signal check sensor determines that the optical switch unit 23 is abnormal. If the output signal itself does not correspond to the drive parameter (movement amount) of the CPU in the control unit, the control unit 24
The encoder input signal check sensor determines that there is an abnormality.

Next, the relationship between the lighting color of each of the LEDs 23b, 24b, ... And the device state will be described with reference to FIG. First, in the optical switch 23 of the core wire selector 20, when power is supplied from the power supply unit 25, the LED 23b
Lights up in green. Then, when the optical switch 23 starts to operate under the control of the control unit 24, the LED 23b switches the lighting to yellow. Further, when the failure detection sensor 23a detects a failure of the optical switch 23, the LED 23b switches the lighting to red. Next, in the control unit 24 of the core wire selector 20, when power is supplied from the power supply unit 25,
The LED 24b lights up in green. The failure detection sensor 2 detects a failure of the control unit 24 or an error of command transmission / reception
When 4a detects, LED24b will switch lighting to red.

Further, in the power supply unit 25 of the core wire selector 20, when power is supplied from the power receiving board 50, the LED 2
5b lights up in green. When the failure detection sensor 25a detects an abnormality in the output voltage of the power supply unit 25, the LED 2
5b switches the lighting to red. Further, in the power receiving board 50, when the power switch is turned on, the LED 50b lights up in green. When the failure detection sensor 50a detects an abnormality in the voltage value due to reverse wiring, the LED 50b switches the lighting to red. Next, the light source unit 31 of the tester 30
In, when the test light is emitted from the LD 32 with a normal light intensity, the LED 31b lights up in green. And L
Abnormal light intensity of the test light emitted from D32, or LD
When the failure detection sensor 31a detects an abnormal rise in the temperature of 32, the LED 31b switches the lighting to red.

Further, in the light receiving section 34 of the tester 30, the abnormal detection temperature of the APD 35 is detected by the failure detection sensor 34.
When a is detected, the LED 34b lights up in red. Further, in the AVR unit 37 of the tester 30, when the failure detection sensor 37a detects an abnormality in the averaging process, the LED 37
b lights in red. Furthermore, in the control unit 38 of the tester 30, when the failure detection sensor 38a detects an abnormality in the memory check, the LED 38b lights up in red.

Next, in the power source section 39 of the tester 30, when power is supplied from the distribution board 60, the LED 39b
Lights up in green. When the failure detection sensor 39a detects an abnormality in the output voltage of the power supply unit 39, the LED 39b
Switches the lighting to red. Further, in the distribution board 60, when the power switch is turned on, the LED 60b lights up in green. When the failure detection sensor 60a detects an abnormality in the voltage value due to the reverse wiring, the LED 60b switches the lighting to red.

Next, the main controller (fault detector) 40 and
Core wire selection device 20 and each constituent part 23, 2 of tester 30
The communication function with 4, ... Will be described. As described above, when a failure occurs, the optical fiber line monitoring apparatus 1 lights up the LED of the failure point in red to identify the failure point. However, the main controller 40 and each of the components 23 and 24. ，
It is also possible to specify a fault location by transmitting / receiving a command to / from. That is, the main controller 40 and each component 2
3, 24, ... are communication cables (communication network)
42, and the main control device 40 is
A status confirmation command can be transmitted to 3, 24, .... Further, each of the constituent units 23, 24, ... Can return an answer command to the status confirmation command to the main control device 40.

An example of these commands is shown in FIG. FIG.
As shown in, the format of the status confirmation command is "CCC_
00xx, zzzz ". The format of the answer command is" ACC_00xx, zzzz, a, bbb ".
bb, ccc, ddddddd, eeee ", where" xx "describes the device number," zzz "describes the package number, and" a "describes the manufacturer identification number. , “Bbbbbb” describes the serial number, “ccc” describes the error information data, “ddddddd” describes the number of operations, and “eeee” indicates the unit mounting state. The data is described.

For example, the optical switch section 2 of the core wire selector 20
3, a status confirmation command is transmitted from the main control device 40 to the main control device 40.
When the answer command is returned from 3, the device number of the core wire selector 20 is “02”, the package number of the optical switch unit 23 is “0001”, the manufacturer identification number of the optical switch unit 23 is “3”, the optical switch The serial number of the section 23 is “00101”, the error information data of the optical switch section 23 is “000”, and the number of operations of the optical switch section 23 is 1020.
If the package mounting status data is set to “0003”, the status confirmation command and the answer command are as follows.

Status confirmation command “CCC — 0002, 0101” Answer command “ACC — 0002, 0101, 3,
Then, the main control device 40 analyzes the received answer command, and displays the analysis result on the monitor 41.

Next, a specific configuration example of the optical fiber line monitoring apparatus in this embodiment will be described with reference to the block diagram of FIG. As shown in FIG. 4, the optical fiber line monitoring device 2 is composed of a plurality of optical component mounting racks B and a test device mounting rack C. Then, the optical component mounting rack B selectively selects the plurality of optical branching modules 10 for inputting and outputting the test light to and from the optical fiber line 13, and the branch core wire 12 and the optical fiber 21 branched from the optical branching module 10. And a core wire selector 20 for optically coupling the same.

Further, the test apparatus installation rack C has an optical fiber 2
6, a plurality of test devices 30 for entering and emitting the test light,
An optical component mounting rack selector 70 for selectively optically coupling the optical fibers 21 and the optical fibers 26 extending from the plurality of optical component mounting racks B, a core wire selector 20, a tester 30, and an optical component mounting rack. The main controller 40 which controls the selector 70 is provided. Here, the optical component mounting rack selector 70 is the core wire selector 2
It has almost the same configuration as 0. That is, in the optical component mounting rack selector 70, an optical fiber arranging member 71 in which a plurality of optical fibers 21 extending from each optical component mounting rack B are arranged in parallel, and the optical fiber arranging member 71 is provided with optical fibers. An optical switch unit 72 is provided for introducing the optical fiber 26 and selectively optically coupling the optical fiber 21 and the optical fiber 26.

The optical component mounting rack selector 70, like the core wire selector 20, also includes a control unit and a power supply unit (not shown). The optical switch section 72, the control section, and the power supply section are configured as a detachable package section.
As a result, when a failure occurs in the optical component mounting rack selector 70, each component in the optical component mounting rack selector 70 can be replaced.

Further, a workstation 80 is connected to the main controller 40 by a communication line. Therefore, the workstation 80 can be used to remotely control the optical fiber line monitoring device 2.

Optical fiber array member 2 of the core selection device 20
2, and the optical fiber array member 71 of the optical component mounting rack selector 70 is provided with an optical return member D, respectively. The optical return member D has a single optical fiber cord U
The optical fiber cord is bent in a letter shape, and both ends of the optical fiber cord are housed in the two V grooves of the optical fiber array members 22 and 71. The both ends of the optical fiber cord and the optical fibers 21 and 26 can be optically coupled by the switching operation of the optical switch units 23 and 72.

As a result, as shown in FIG. 5, when the optical fiber 26 and the optical return member D are optically coupled, the test light incident on the optical return member D from the optical fiber 26 is selected by the core wire selector. It can be returned to the optical fiber 26 again without being incident on 20. In this way, the tester 30
By making the test light reciprocate between the optical component mounting rack selector 70 and the optical component mounting rack selector 70, the disconnection inspection of the optical fiber 26 can be performed. Further, as shown in FIG. 6, when the optical fiber 21 and the optical return member D are optically coupled, the optical fiber 2
The test light that has entered the optical return member D from the optical fiber 1 is input again to the optical fiber 2 without entering the optical branching module 10.
Can be set back to 1. As described above, the test light is reciprocated between the tester 30 and the core wire selector 20, so that the disconnection inspection of the optical fiber 21 can be performed.

The optical fiber line monitoring device 2 shown in FIG.
It has a function of detecting water ingress of the optical fiber line 13. That is, the optical fiber line 13 incorporates a water immersion sensor fiber 90 for water immersion detection, and a water immersion detection module 91 is fixed to the water immersion sensor fiber 90 at predetermined intervals. The water immersion detection module 91 functions to bend the water immersion sensor fiber 90 during water immersion. Furthermore, one end of the water immersion sensor fiber 90 is connected to the core wire selector 20, and by the core wire selector 20,
The immersion light sensor fiber 90 and the optical fiber 21 can be optically coupled to each other to allow the test light to enter and exit the immersion water sensor fiber 90. As a result, the flood detection module 9
When 1 is flooded and the flooded sensor fiber 90 is bent, the backscattered light intensity of the test light propagating through the flooded sensor fiber 90 deteriorates. By measuring the deterioration of the backscattered light intensity of the test light due to the bending loss with the tester 30, it is possible to detect the water immersion of the optical fiber line 13.

As shown in FIG. 7, the water immersion detection module 9
1 has a rectangular parallelepiped plastic case 91a having an open top surface, and a fiber through hole 91b is formed in a pair of side surfaces facing each other of the case 91a. And the water immersion sensor fiber 90 penetrates and is fixed to these fiber through-holes 91b. Inside the plastic case 91a, two threshold plates 91c and 91d are arranged with the immersion sensor fiber 90 interposed therebetween, and one of the threshold plates 91c has a convex shape. The other threshold plate 91d has a concave shape that engages with the threshold plate 91c. Further, the threshold plates 91c, 91
A water absorbent material 91e is filled between the d and the case 91a. A plastic lid 91f having a plurality of holes formed on its surface is attached to the upper surface of the case 91a.

Then, as shown in FIG. 8, when the coating of the optical fiber line 13 is broken and the water intrusion detection module 91 is inundated, the water absorbent material 91e absorbs water and expands.
As a result, the distance between the two threshold plates 91c and 91d is narrowed, and the water sensor fiber 90 is bent in a U-shape,
Bending loss occurs in the test light. An example of the bending loss of this test light is shown in FIG. FIG. 9 is a graph showing the relationship between the transmission loss of the immersion sensor fiber 90 and the immersion time. From this graph, it can be seen that the transmission loss of the water immersion sensor fiber 90 increases until 60 minutes have elapsed after the water immersion detection module 91 has been flooded. Therefore, the tester 30 can detect that the coating of the optical fiber line 13 is broken and the water intrusion detection module 91 is inundated.

Next, the core wire selector 20 by the main controller 40
The failure isolation procedure will be described with reference to the flowcharts of FIGS. FIG. 10 shows a core selector 2
It is a flow chart which shows the outline of the fault isolation procedure of 0. First, the main controller 40 transmits a state confirmation command to each of the constituent units 23, 24, ... Of the core wire selector 20 (step 100). The main controller 40 monitors the reply of the answer command to the status confirmation command (step 101). If the answer command is not returned to the main controller 40 even after a predetermined time has passed, the failure detection sensor 24a. From the power supply unit 25 to the control unit 24
It is checked whether or not power is being supplied to (step 102).

When it is determined in this process that the control section 24 is not supplied with power, the main controller 40 uses the failure detection sensor 25a to supply power from the power receiving panel 50 to the power supply section 25. It is checked whether it is present (step 103). Further, when it is determined in this process that the power supply unit 25 is not supplied with power, the main controller 40 checks whether or not a failure detection alarm is output from the failure detection sensor 25a (step 104). Then, in this process, when it is determined that the failure detection alarm is not output, the main controller 40 determines that the control unit 24 has a failure (step 105). The authorization result is displayed on the monitor 41, and the administrator who confirms the display on the monitor 41 replaces the control unit 24 or the like (step 106).

When it is determined in step 104 that the failure detection alarm is output, the main controller 40
Certifies that the power supply unit 25 has failed (Step 1
07). The authorization result is displayed on the monitor 41, and the administrator who confirms the display on the monitor 41 replaces the power supply unit 25 or the like (step 108). Further, when it is determined in step 103 that power is being supplied to the power supply unit 25, the main controller 40 uses the failure detection sensor 50a to check whether the output of the power receiving panel 50 is normal (step 109). Then, in this process, when it is determined that the output of the power receiving board 50 is normal, the main controller 40 determines that the wiring cable or the power supply unit 25 is not properly attached (step 110). The authorization result is displayed on the monitor 41, and the cable wiring is confirmed by the administrator who confirms the display on the monitor 41 (step 111).

Further, when it is determined in step 109 that the output of the power receiving panel 50 is not normal, the main controller 40
Checks whether the input of the power receiving panel 50 is normal using the failure detection sensor 50a (step 112). In this process, when it is determined that the input of the power receiving board 50 is normal, the main controller 40 determines that the failure detecting sensor 50 of the power receiving board 50.
It is checked whether a failure detection alarm is output from a (step 113).

Further, in this processing, when it is determined that the failure detection alarm is not output, the main controller 40
Determines that the fuse may be blown (step 114). The authorization result is displayed on the monitor 41, and the fuse is checked by the administrator who confirms the display on the monitor 41. As a result, when it is determined that the fuse is not blown, the administrator recognizes that the power receiving board 50 is out of order (step 115) and replaces the power receiving board 50 (step 116). When it is determined that the fuse is blown, the administrator recognizes that the fuse is blown (step 117) and replaces the fuse (step 118).

When it is determined in step 113 that the failure detection alarm is output, the main controller 40
Judges that the wiring of the power receiving board 50 is reversed (step 119). This authorization result is displayed on the monitor 41, and rewiring is performed by the administrator who confirms the display on the monitor 41 (step 120). Further, in step 112,
When determining that the input of the power receiving board 50 is abnormal, the main controller 40 determines that the wiring of the power receiving board 50 is abnormal (step 121). This authorization result is displayed on the monitor 41, and by the administrator who confirms the display on the monitor 41,
Rewiring is performed (step 122).

Further, if it is determined in step 102 that the controller 24 is supplied with power, the main controller 4
In 0, it is checked whether a failure detection alarm is output from the failure detection sensor 24a (step 123). Then, in this process, when it is determined that the failure detection alarm is output, the main controller 40 determines that the control unit 24 has a failure (step 124). The authorization result is displayed on the monitor 41, and the administrator who confirms the display on the monitor 41 replaces the control unit 24 (step 12).
5).

When it is determined in step 123 that the failure detection alarm is not output, the main controller 4
For 0, it is checked whether a communication abnormality alarm is output from the failure detection sensor 24a (step 126). In this process, when it is determined that the communication abnormality alarm is output, the main controller 40 causes the monitor 41 to display that the wiring needs to be replaced. When the administrator who confirms this display replaces the wiring, the main controller 40 checks again whether a communication abnormality alarm is output from the failure detection sensor 24a (step 127).

In this process, if it is determined that the communication abnormality alarm is no longer output, the main controller 40 determines that the communication cable 42 is abnormal (step 12).
8). This certification result is displayed on the monitor 41 and the monitor 4
By the administrator who has confirmed the display of 1, the communication cable 42
Are exchanged (step 129). Then, when it is determined in step 127 that the communication abnormality alarm is still output, the main controller 40 determines that the tester 30 is out of order (step 130). The authorization result is displayed on the monitor 41, and the administrator who confirms the display on the monitor 41 replaces the control unit 38 of the tester 30 (step 131).

Further, when it is determined in step 126 that the communication abnormality alarm is not output, the main controller 40 determines that there is no abnormality (step 132). The authorization result is displayed on the monitor 41, and the administrator who confirms the display on the monitor 41 restarts the device or contacts the manufacturer (step 133).

Next, in step 101, when the answer command is returned to the main controller 40 within a predetermined time, the main controller 40 checks whether the returned answer command is normal (step 134). ). In this process, when it is determined that the answer command is not normal, the main controller 40 determines that the error information data of the answer command is
It is checked whether it is other than "000" (no abnormality) (step 135). In this process, the error information data is "000"
If it is determined to be other than the above, the main controller 40 checks whether or not there is an error in the status confirmation command transmitted in step 100 (step 136).

When it is determined in this process that the status confirmation command has an error, the main controller 40 determines that the BCC (Block Check Character) added to the answer command.
) Is analyzed to check whether a communication error has occurred (step 137). Here, the BCC is so-called parity check data that is added to the answer command in order to detect a transmission error. And in this process,
When it is determined that a communication error has occurred, the main controller 4
For 0, it is checked whether the number of retries of the answer command is within the specified number (step 138). Further, when it is determined in this process that the number of retries is within the specified number of times, the main controller 40 determines that the communication function of the control unit 24 is abnormal (step 139). The authorization result is displayed on the monitor 41, and the administrator who confirms the display on the monitor 41 replaces the control unit 24 (step 14).
0).

If it is determined in step 138 that the number of retries is greater than the specified number, the main controller 40
Determines that the tester 30 or the communication cable 42 is abnormal (step 141). This certification result is the monitor 41
Displayed on the monitor 41, the administrator confirming the display on the monitor 41 exchanges the communication cable 42 and the like (step 1
42).

Further, when it is determined in step 137 that a communication error has not occurred, the main controller 40
The error information data of the answer command is analyzed to check whether a format error has occurred (step 14).
3). When it is determined in this process that a format error has occurred, the main controller 40 determines that the status confirmation command is abnormal (step 144). The authorization result is displayed on the monitor 41, and the administrator who confirms the display on the monitor 41 reissues the status confirmation command (step 145).

Further, when it is determined in step 143 that the format error has not occurred, the main controller 40 analyzes the error information data of the answer command, and the device abnormality occurs in the power supply unit 25. It is checked (step 146). In this process, when it is determined that the device abnormality has occurred, the main controller 40 determines that the output of the power supply unit 25 is abnormal (step 147). The authorization result is displayed on the monitor 41, and the administrator who confirms the display on the monitor 41 replaces the power supply unit 25 or the like (step 148).

Furthermore, if it is determined in step 146 that no device abnormality has occurred, the main controller 40
Parses the error information data of the answer command,
It is checked whether a device abnormality has occurred in the control unit 24 (step 1
49). In this process, when it is determined that the device abnormality has occurred, the main controller 40 determines that the operation of the control unit 24 is abnormal (step 150). The authorization result is displayed on the monitor 41, and the administrator who confirms the display on the monitor 41 replaces the control unit 24 (step 1).
51).

Furthermore, when it is determined in step 149 that no device abnormality has occurred, the main controller 40
Parses the error information data of the answer command,
It is checked whether a device abnormality has occurred in the optical switch section 23 (step 152). When it is determined in this process that an apparatus abnormality has occurred, the main controller 40 determines that the operation of the optical switch unit 23 is abnormal (step 153). This authorization result is displayed on the monitor 41, and the administrator who confirms the display on the monitor 41 replaces the optical switch unit 23 (step 154).

Furthermore, if it is determined in step 136 that there is no error in the status confirmation command, and if it is determined in step 152 that no device abnormality has occurred, the main controller 40 determines that there is no abnormality. (Step 155). This authorization result is displayed on the monitor 41, and the administrator who confirms the display on the monitor 41 restarts the device or contacts the manufacturer (step 15).
6).

If it is determined in step 135 that the error information data is "000", the main controller 4
For 0, it is checked whether a communication abnormality alarm is output from the failure detection sensor 24a (step 157). In this process, when it is determined that the communication abnormality alarm is output, the main controller 40 causes the monitor 41 to display that the wiring needs to be replaced. When the administrator who confirms this display replaces the wiring, the main controller 40 checks again whether a communication abnormality alarm is output from the failure detection sensor 24a (step 158).

When it is determined in this process that the communication abnormality alarm is no longer output, the main controller 40 determines that the communication cable 42 is abnormal (step 15).
9). This certification result is displayed on the monitor 41 and the monitor 4
By the administrator who has confirmed the display of 1, the communication cable 42
Are exchanged (step 160). Then, when it is determined in step 158 that the communication abnormality alarm is still output, the main controller 40 determines that the tester 30 has failed (step 161). The authorization result is displayed on the monitor 41, and the administrator who confirms the display on the monitor 41 replaces the control unit 38 of the tester 30 (step 162).

Further, when it is determined in step 157 that the communication abnormality alarm is not output, the main controller 40 determines that there is no abnormality (step 163). This authorization result is displayed on the monitor 41, and the administrator who confirms the display on the monitor 41 restarts the device or contacts the manufacturer (step 164).

Next, in step 134, when it is determined that the answer command is normal, the test light emitted from the light source section 31 passes through the light receiving section 34 and the AVP section 37, and the main controller 40. Check if you're back in (Step 1
65). In this process, when it is determined that the test light has not returned to the main controller 40, the main controller 40 uses the failure detection sensor 31a to check whether the light output of the light source unit 31 is normal ( Step 166). Then, in this process, when it is determined that the light output of the light source unit 31 is abnormal, the main controller 40 determines that the light source unit 31 is out of order (step 167). The authorization result is displayed on the monitor 41, and the light source unit 31 is replaced by the administrator who confirms the display on the monitor 41 (step 16).
8).

If it is determined in step 166 that the light output of the light source section 31 is normal, the optical component mounting rack selector 70 is operated to operate the optical return member D and the optical fiber 2.
6 and 6 are optically coupled (step 169). Then, the test light traveling back and forth through the optical fiber 26 is inspected (step 1
70) If the light intensity of the test light is reduced, the main controller 40 determines that the optical fiber 26 is abnormal (step 171). This certification result is displayed on the monitor 41,
The administrator who confirms the display on the monitor 41 replaces the optical fiber 26 or the like (step 172).

Next, the optical switch section 72 of the optical component mounting rack selector 70 is operated to select an arbitrary optical component mounting rack B (step 173). Then, the optical fiber selector 21 is operated to optically couple the optical return member 23 and the optical fiber 21 (step 174). Further, the test light traveling back and forth through the optical fiber 21 is inspected (step 175), and when the light intensity of the test light is reduced, the main controller 40 also performs the same inspection on the other optical component mounting rack B. Do (Step 1
76). Then, when the continuity of the optical fiber 21 connected to the optical component mounting rack B is normal, the main controller 40
Checks the continuity of the optical fiber 21 between the optical component mounting racks B (step 177).

Further, in this inspection, if the continuity of the optical fiber 21 between the optical component mounting racks B is normal, the main controller 40
Determines that the core wire selector 20 is abnormal (step 178). The authorization result is displayed on the monitor 41, and the administrator who confirms the display on the monitor 41 replaces the optical switch unit 23 (step 179). Further, in the inspection of step 117, when the continuity of the optical fiber 21 between the optical component mounting racks B is not normal, the main controller 40 determines that the optical fiber 21 between the optical component mounting racks B is defective. (Step 180). This authorization result is displayed on the monitor 41, and by the administrator who confirms the display on the monitor 41,
The optical fiber 21 is exchanged between the optical component mounting racks B (step 181).

Further, in step 176, when the continuity of the optical fiber 21 connected to the optical component mounting rack B is not normal, the main controller 40 determines that the optical component mounting rack selector 70 is abnormal ( Step 182). This authorization result is displayed on the monitor 41, and the administrator who confirms the display on the monitor 41 allows the optical fiber 72 of the optical component mounting rack selector 70 to be selected.
Are exchanged (step 183).

Next, the core selector 20 is operated to release the optical coupling between the optical return member 23 and the optical fiber 21,
The arbitrary branched core wire 12 and the optical fiber 21 are optically coupled (step 184). Then, the test light is made incident on the optical fiber line 13 and it is inspected whether the test light returns to the tester 30 (step 185). If the test light does not return to the tester 30 as a result of this inspection, the main controller 40 determines that the branch core wire 12 is defective (step 186). The authorization result is displayed on the monitor 41, and the administrator who confirms the display on the monitor 41 replaces the optical fiber 23 of the core wire selector 20 (step 187).

Further, when the test light returns to the tester 30 in step 185, the main controller 40 checks whether or not the branch core wire 12 is normally connected to the branch module 10 (step 188). In this process, the branch core wire 1
When it is determined that the branch module 10 is normally connected to the branch module 10, the main controller 40 determines that the branch module 10 is abnormal (step 189). The authorization result is displayed on the monitor 41, and the branch module 10 is replaced by the administrator who confirms the display on the monitor 41 (step 190). When it is determined in step 188 that the branch core wire 12 is not normally connected to the branch module 10, the main controller 40 determines that the branch core wire 12 is
It is recognized that the connection is defective (step 191). The authorization result is displayed on the monitor 41, and the administrator who confirms the display on the monitor 41 reconnects the branch core wire 12 and restarts the device (step 192).

The internal memory of the main controller 40 and a storage device such as a hard disk (HD) for storing the memory state thereof include a correspondence table of each unit (article) / functional block / abnormality detection content shown in FIG. As a database. Then, the contents of the database are updated based on the information obtained according to the procedure shown in and after step 100. Further, even when the failure status is restored, the failure status is collected based on the same procedure and the database is updated with the content of the recovery.

Further, when analyzing the failure state, the inference is made according to the following rules. That is,
(1) Phenomena that can occur and phenomena that cannot occur from the state before the occurrence of a fault are divided into groups, and for phenomena that are unlikely to occur, a fault analysis including higher-level concepts is performed. (2) When there are a plurality of causes estimated from the same phenomenon, the analysis is performed after considering the past history and the states of other related units. And (1)
Inference with a self-diagnosis function such as (2) is performed by the main controller 40.
Run on.

The present invention is not limited to the above embodiment, and various modifications can be made. For example, in the above-described embodiment, both the constituent parts of the core wire selector 20 and the constituent parts of the tester 30 are divided into the package parts A.
Only one of them may be used.

Further, in the above embodiment, the water immersion sensor fiber 90 is used to detect the water immersion of the optical fiber line 13, but the state of the optical fiber line 13 may be monitored using other sensor fibers. . For example, a temperature sensor fiber may be used to detect an abnormal temperature rise in the optical fiber line 13, and a humidity sensor fiber may be used to detect an abnormal humidity rise in the optical fiber line 13.

[0070]

As described in detail above, the optical fiber line monitoring apparatus of the present invention comprises a plurality of optical branching modules each containing an optical coupler, a branch core wire branched from each optical coupler, and a master side optical fiber. A core wire selector that selectively optically couples and a tester that allows the test light to enter and exit the master-side optical fiber are provided. At least one of the core wire selector and the tester is composed of a plurality of detachable package parts, and each package part is provided with a failure detection sensor for detecting a failure state in the package part. . Therefore, when a failure occurs in any of the package parts, the failure detection sensor provided in the package part at the failure part can identify the failure part and detect the failure state.

In this way, since the failure location can be specified by the failure detection sensor provided in each package,
Repairing failures becomes easy. Further, since the failure state can be detected by the failure detection sensor, it is easy to respond to the failure state. For example, the damage caused by failure is severe,
If parts need to be replaced, the entire package part may be replaced. As described above, the monitoring device can be quickly restored by exchanging the package units.

[Brief description of drawings]

FIG. 1 is a schematic diagram showing a basic configuration of an optical fiber line monitoring device according to an embodiment of the present invention.

FIG. 2 is a chart showing a relationship between a lighting color of each LED and a device state.

FIG. 3 is a table showing formats of a status confirmation command and an answer command.

FIG. 4 is a block diagram showing a specific configuration example of the optical fiber line monitoring device in the present embodiment.

FIG. 5 is a schematic diagram showing an example of optical coupling between an optical fiber and a light return member.

FIG. 6 is a schematic view showing an example of optical coupling between an optical fiber and a light return member.

FIG. 7 is a perspective view showing a structure of a water immersion detection module.

FIG. 8 is a schematic view showing an operation of the water immersion detection module.

FIG. 9 is a graph showing the relationship between the transmission loss of the immersion sensor fiber and the immersion time.

FIG. 10 is a flowchart showing a fault isolation procedure of the core wire selector by the main controller.

FIG. 11 is a flowchart showing a fault isolation procedure of the core wire selector by the main controller.

FIG. 12 is a flowchart showing a fault isolation procedure of the core wire selector by the main controller.

[Explanation of symbols]

1, 2 ... Optical fiber line monitoring device, 10 ... Optical branch module, 11 ... Optical coupler, 12 ... Branch core wire, 13 ... Optical fiber line, 20 ... Core wire selector, 21 ... Optical fiber (master side optical fiber) , 22 ... Optical fiber array member, 23
a, 24a, 25a, 31a, 34a, 37a, 38
a, 39a ... Failure detection sensor, 23b, 24b, 25
b, 31b, 34b, 37b, 38b, 39b ... LED
(Display unit), 30 ... Tester, 40 ... Main control device (fault detector), 42 ... Communication cable (communication network), A
... Package part, D ... Optical return member. Attorney Attorney Yoshiki Hasegawa

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Yoichi Okamoto 1 Taya-cho, Sakae-ku, Yokohama-shi, Kanagawa Sumitomo Electric Industries, Ltd. Yokohama Works (72) Inventor Kazuma Ozawa 1 Taya-cho, Sakae-ku, Yokohama, Kanagawa Sumitomo Denki Kogyo Co., Ltd. Yokohama Works (72) Inventor Masahiro Hamada 1 Taya-cho, Sakae-ku, Yokohama-shi, Kanagawa Sumitomo Denki Kogyo Co., Ltd. Yokohama Works (72) Inventor Naoki Nakao 3-19 Nishi-Shinjuku, Shinjuku-ku, Tokyo No. 2 in Nippon Telegraph and Telephone Corporation (72) Inventor Yasunori Nakabayashi 3-chome, Nishishinjuku, Shinjuku-ku, Tokyo 19-2 Nippon Telegraph and Telephone Corporation (72) Inventor Naoyuki Atobe 3-chome, Nishishinjuku, Shinjuku-ku, Tokyo 19th and 2nd Nippon Telegraph and Telephone Corporation

Claims (6)

[Claims] 1. A plurality of optical branching modules each having a built-in optical coupler that inputs and outputs test light to and from an optical fiber line,
A core wire selector that selectively optically couples a branched core wire branched from each of the optical couplers and a master-side optical fiber, and a tester that inputs and outputs the test light to and from the master-side optical fiber. In the optical fiber line monitoring device for monitoring a fault condition in the optical fiber line, at least one of the core wire selector and the tester is composed of a plurality of detachable package parts, and each of the package parts. The optical fiber line monitoring device is characterized in that a fault detection sensor for detecting a fault state in the package section is provided in the. 2. The optical fiber line monitoring device according to claim 1, wherein each of the package units includes a display unit that displays a failure content when a failure is detected by the failure detection sensor. 3. The optical fiber selector includes an optical return member that returns the test light emitted from the master-side optical fiber to the master-side optical fiber without causing the test light to enter the optical branching module, and each of the optical beams. An optical fiber arranging member for fixing the branch optical fiber branched from the coupler in parallel, and by introducing the master side optical fiber into the optical fiber arranging member, the optical return member and the plurality of branch optical fibers. 3. The optical fiber line monitoring device according to claim 1 or 2, wherein any one of the above is optically coupled to the master side optical fiber. 4. A communication network connected to the core wire selector and the tester, and a package unit that is connected to the communication network and receives a failure detection signal transmitted from the failure detection sensor to cause a failure. The optical fiber line monitoring device according to any one of claims 1 to 3, further comprising: a failure detector that identifies 5. The failure detector is based on a database unit accumulating past failure cases, the failure detection signal transmitted from the failure detection sensor, and the failure cases read from the database unit, The optical fiber line monitoring device according to claim 4, further comprising: a failure state analysis unit that analyzes a failure state of the package unit. 6. The failure detector includes a failure state inference unit that infers a failure state of the package unit based on the failure detection signal transmitted from the failure detection sensor. 4. The optical fiber line monitoring device according to 4.