KR101919018B1 - Smart optical line monitoring system - Google Patents

Abstract

Disclosed is an optical transmission apparatus including an optical transmission module which can transmit data by transceiving an optical signal through an optical line. Provided are an optical line monitoring apparatus, which can perform an OTDR measurement process measuring a defect location or a disconnection location on an optical line by transmitting OTDR measurement light generated by the optical transmission module along the optical line, and can automatically perform the OTDR measurement process by delivering the OTDR measuring light on a predetermined cycle through the optical line, and an optical monitoring system including the same. The optical line monitoring system comprises a control device, a central optical transmission device, and a remote optical transmission device.

Description

Smart optical line monitoring system {SMART OPTICAL LINE MONITORING SYSTEM}

This disclosure relates to a smart fiber line monitoring system.

BACKGROUND ART [0002] Optical communication systems, which are broadband communication networks capable of transmitting a large amount of data at high speed with the development of information communication technologies, are widely spread. Recently, optical communication systems have been used not only for closed circuit television (CCTV) but also traffic systems such as traffic monitoring cameras and bus stop signs.

Such an optical communication system connects an optical transmission equipment of a remote place where a terminal device such as a camera is disposed to an optical transmission equipment and a network management system (NMS) of a central control center through an optical cable, .

Optical cables such as optical cables are often installed in the air or buried in the ground through manholes. Since they may be easily damaged by external impacts such as piping or subsidence due to excavation work, An optical line monitoring system is needed to monitor the damage.

The optical line monitoring system measures and calculates the defect position of the optical line based on the OTDR (Optical Time Domain Reflectometer) method which detects the scattered reflection wave generated at the fracture plane when the optical line breakage occurs and calculates the distance to the breakage point .

This optical line monitoring system uses an optical wavelength different from that of the optical communication system for data transmission in order to implement the OTDR function, and an optical communication system and a dual system such as installing separate hardware and monitoring software There is a problem that the number of components such as a wavelength division filter and an amplifier for dividing an optical signal for optical line monitoring increases as well as the number of optical devices and wiring increases.

In addition, as the number of optical equipments and components increases, insertion loss and connection loss increase. Therefore, it is difficult to add or remove optical equipments because the number of optical equipments is limited, and the cumbersome work There is a problem that the number of components such as amplifiers is greatly increased in order to compensate for insertion loss or connection loss.

In addition, there is a disadvantage in that it is not possible to monitor unauthorized access to an optical connection enclosure provided in a manhole on the optical line or in the processing to unauthorized opening and closing and hacking or damaging the optical line.

Accordingly, the present disclosure provides a smart optical line monitoring system capable of solving such problems and other problems.

According to an exemplary embodiment of the present disclosure, there is provided a smart fiber line surveillance system integrated into an optical communication system, the optical telecommunication system comprising: a control device for controlling the optical communication system; An optical transmission device and a remote optical transmission device connected to the central optical transmission device through an optical line, each optical transmission device comprising: an optical transmission module for transmitting and receiving data light for optical communication through the optical line; And a control unit for controlling operation of the optical transmission module, wherein the optical transmission module transmits and receives the data light through the optical line, and transmits the data light through the optical line to / Or a disconnection position, and the OTDR measurement light transmits and receives the same wavelength as the data light And the control unit of the optical transmission apparatus detects that an abnormality is detected in a predetermined level of a signal of the data light transmitted and received by the optical transmission module even when there is no control signal for OTDR measurement from the control apparatus, The OTDR measurement light is automatically transmitted from the optical transmission module to measure a defect position or a disconnection position on the optical line, and the optical line includes respective sections connecting the optical transmission devices Each of the optical transmission devices performs the OTDR measurement with respect to each of the adjacent sections of the respective sections, and each of the sections includes a plurality of light beams adjacent to both sides of the respective sections along the optical line, Wherein the OTDR measurement is monitored by the transmitting apparatus in a redundant manner, A bypass circuit for bypassing the OTDR measurement light is operated to the optical transmission device in which the failure or the failure occurs, and the control circuit of another optical transmission device adjacent to the optical transmission device in which the failure or failure occurs, Is automatically switched so that the OTDR measurement can be performed for an extended section including its own OTDR measurement interval and the OTDR measurement interval of the failed or failed optical transmission apparatus. have.

In addition, the OTDR data obtained from the OTDR measurement is notified in real time to the control apparatus together with an alarm signal for warning of a defect or disconnection on the optical line.

Further, the control apparatus transmits a control signal for requesting a status value to at least one of the optical transmission devices, and each of the optical transmission devices performs the OTDR measurement by the control signal, Reports the status value of the self device including the OTDR data and the ID information obtained from the OTDR measurement in response to the signal, and the control device analyzes the status value reported from each optical transmission device, Further comprising a geographic information system for deriving an observation point on said optical line of concern and for exposing said optical line and said position of said respective optical transmission device on an electronic map, said geographic information system comprising: A visual status of the observation point on the electronic map based on the state value, A smart optical line monitoring system can be provided.

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According to the present disclosure, there is provided a smart optical line monitoring system capable of improving the above-described problems and other problems. Benefits, actions, and effects of the present disclosure will become more apparent from the following detailed description of exemplary embodiments of the disclosure.

1 is a block diagram showing the configuration of an optical line monitoring system 1000 according to an embodiment of the present disclosure.
2 is a block diagram illustrating a detailed configuration of a central optical transmission apparatus 200 according to an embodiment of the present disclosure.
3 is a block diagram illustrating an embodiment of an OTDR measurement process performed by an optical transmission device 200, 400a-400c having an optical transmission module 250 of FIG.
4 is a graph of an optical power value (P) showing an example of an abnormal level of an optical signal.
5 is an exemplary screen in which a fault occurrence point on the optical line specified based on the OTDR measurement result is displayed on an electronic map of the GIS system.
6 is a flowchart showing a control routine for executing the OTDR self-measurement.
7A is a perspective view showing a closed state of the optical connector 500a according to the embodiment of the present disclosure.
7B is a perspective view showing the state in which the optically connected housing 500a of FIG. 7A is opened endlessly.
8 is a block diagram showing an embodiment of an OTDR measurement process at the time of occurrence of an event that the optical connector 500a is opened uninterrupted.
9 is a block diagram of an OTDR period measurement using an optical line monitoring system 1000 according to an embodiment of the present disclosure.
10 is an exemplary screen showing the state value of the observation point on the electronic map of the GSI system.
11A is a block diagram illustrating an installation state of the remote optical transmission devices 400a to 400c according to the length of the optical line 300. As shown in FIG.
FIG. 11B is a block diagram showing an embodiment of an OTDR bypass measurement process in the optical line monitoring system 1000 of FIG. 11A.

Hereinafter, exemplary embodiments of the present disclosure will be described in detail with reference to the accompanying drawings. The following description is provided to assist in understanding the present disclosure, and the present disclosure is not limited to the embodiments described below. Further, the accompanying drawings may be partially or entirely enlarged or exaggerated, or schematically shown or omitted for convenience of explanation.

Throughout the description of the invention, when it is described that a part is "connected" or "connected" to another part, it can be directly connected or connected, as well as indirectly connected or connected indirectly through another medium or component And the like. Furthermore, when describing a component as "comprising" or "comprising ", a component may include other components than the component described, But does not preclude the presence or addition of one or more other features, elements, components, steps, operations, or combinations thereof.

1 is a block diagram showing the configuration of an optical line monitoring system 1000 according to an exemplary embodiment of the present disclosure.

1, an optical line monitoring system 1000 includes a control device 100, a central optical transmission device 200 connected to the control device 100, a central optical transmission device 200 coupled to the remote optical transmission devices 400a-400c. The optical line monitoring system 1000 may further include optical connection enclosures 500a to 500d disposed on the optical line 300. [

The control apparatus 100 may be a network management system (NMS) as a control device for monitoring and controlling the operation of the optical communication system. The control apparatus 100 may include an NMS operating PC having an input / output unit for processing various signals, display means for displaying an audiovisual signal, wired / wireless communication means with an external device, and an NMS server. The control apparatus 100 includes a Geographical Information System (GIS) for storing, processing, and displaying data such as the position, path, length, and coordinates of the optical line 300 or the optical transmission devices 200 and 400a to 400c as geographical information, System.

The control apparatus 100 may include optical line monitoring software for operating the optical line monitoring system 1000. An OTDR function for measuring and calculating a failure occurrence point of the optical line 300 can be executed when a failure such as disconnection or breakage of the optical line 300 is detected by the optical line monitoring software. The point of occurrence of a fault on the optical line 300 specified by the OTDR function can be displayed as geographical information by the GIS system provided in the control apparatus 100. [ The control apparatus 100 can integrate and operate the optical line monitoring software with data transmission software.

The control apparatus 100 may be connected to the central optical transmission apparatus 200 by a wired or wireless network. The central optical transmission apparatus 200 may be connected to the control apparatus 100 and may be connected to the remote optical transmission apparatuses 400a to 400c through the optical line 300. [ The remote optical transmission devices 400a to 400c are disposed at a remote location remote from the central optical transmission device 200 and are connected to the central optical transmission device 200 and / or other remote optical transmission devices 400a to 400c As shown in FIG.

Each of the optical transmission devices 200, 400a to 400c may include one or more optical transmission modules 250 capable of transmitting and receiving optical signals. The optical signal may be transmitted by a light emitting means such as a laser diode incorporated in each optical transmission module 250 and received by a light receiving means such as a photodiode. The optical transmission module 250 may have a data transmission capacity of 1.25 Gbps, 5 Gbps, 10 Gbps, or the like.

The optical line 300 may be an optical cable line for transmitting an optical signal. The optical cable may include a core comprising optical fibers for transmitting an optical signal, a shell for insulation and a buffer layer which is a protective coating. The optical line 300 may be formed of an optical cable bundle including a plurality of optical cables. The optical transmission devices 200 and 400a to 400c can be connected to each other by the optical line 300 including the optical cable bundle.

The optical fiber bundles 500a to 500d may be provided on the optical line 300. The optical connection enclosures 500a to 500d can interconnect the optical cable bundles connected to the respective optical transmission devices 200, 400a to 400c at their intermediate points.

The optical signal can be transmitted between the optical transmission devices 200, 400a to 400c through the optical line 300. [ The optical signal may be a signal obtained by converting and multiplexing an electrical signal including data, a control command, etc. according to a predetermined optical communication protocol so as to represent a series of digital codes.

In the optical line monitoring system 1000 according to the present disclosure, the OTDR measurement light and the data transmission / reception light for inspection of the optical line 300 may be composed of light having the same wavelength band. Therefore, components such as a wavelength division filter for dividing OTDR measurement light into data transmission / reception light are not required, and insertion loss and connection loss due to such components can be prevented, and the number of components such as amplifiers can be greatly reduced. As the oscillation wavelength of the optical signal, a wavelength band of about 1310 nm for the transmission light and about 1550 nm for the reception light can be used. The optical signal is not limited to such a wavelength, and light of a different wavelength band can be used if necessary. Since optical signals having the same wavelength are used for OTDR measurement and data transmission and reception, optical line monitoring and optical data transmission can be performed through one optical line 300. Therefore, it is not necessary to separately provide a system or a line for monitoring the optical line, and the configuration and wiring of the entire system can be greatly simplified.

The configuration of the central optical transmission apparatus 200 is the same as that of the remote optical transmission apparatuses 400a to 400c except that the central optical transmission apparatus 200 is connected to the control apparatus 100 and executes a control command of the control apparatus 100, The detailed structure of the optical transmission device will be described with the central optical transmission device 200 as a center.

2 is a block diagram illustrating a detailed configuration of a central optical transmission apparatus 200 according to an embodiment of the present disclosure.

Referring to FIG. 2, the central optical transmission apparatus 200 may include a main body 210 and an optical transmission module 250.

The main body 210 may include a signal control processing unit 211, a signal multiplexing unit 212, a device control unit 214, a storage unit 215, and a calculation unit 216.

The signal control processing section 211 is constituted by a circuit such as a multiplexer and outputs a signal for receiving or transmitting from the control apparatus 100 and / or the optical transmission module 250 connected to the central optical transmission apparatus 200 Can be processed and dispensed.

The signal multiplexing unit 212 can multiplex data, control commands, and the like, which are converted into optical signals, into a series of digital signals by a signal multiplexing engine or the like.

The device control unit 214 is a part for controlling the overall driving of the optical transmission device and is constituted by signal processing means such as a CPU and processes signals transmitted from the signal control processing unit 211 and the signal multiplexing unit 212, A control signal for controlling the operation can be transmitted. Further, the device control unit 214 can execute the program stored in the storage unit 215 and control the arithmetic processing and the like of various data.

The storage unit 215 is made up of a memory such as an EEPROM, and can store various data and programs. The storage unit 215 may store data and programs for executing the OTDR function. Accordingly, a measurement process such as an OTDR self-measurement described later can be performed. The arithmetic operation unit 215 can execute various programs and perform data arithmetic processing in response to a command from the device control unit 205. [

The main body 210 may further include a display unit 220 for displaying the video / audio signal as an audiovisual signal to be seen and heard. The display unit 220 may be installed outside the main body 210. The main body 210 may include an input / output unit 213 for inputting / outputting data to / from the display unit 220.

The optical transmission module 250 may include a composite signal processing unit 251, an optical signal input / output unit 252, an optical signal transmission unit 253, and a module control unit 254, .

The composite signal processing unit 251 may be composed of a circuit such as a multiplexer and may process and distribute signals received from the main body 210 or transmitted to the main body 210. [

The optical signal input / output unit 252 converts the received light into an electric signal by a light receiving unit such as a photodiode or inputs the electric signal processed by the composite signal processing unit 251 to a light signal by a light emitting unit such as a laser diode And output it. The optical signal input / output unit 252 may include a plurality of optical input ports and a plurality of optical output ports. The optical signal input / output unit 252 may include an OTDR oscillation circuit and an input / output port for transmitting and receiving the OTDR measurement light. The OTDR measurement light is output through a port different from the data transmission light and is coupled in the optical signal transmission unit 253 to the optical transmission line 300 ). ≪ / RTI > The OTDR reception light received by the optical transmission module 250 may be separated from the optical signal transmission unit 253 and input to the optical signal input / output unit 252 through a port different from the data reception light.

The optical signal transmission unit 253 separates the received light received through the optical line 300 by an optical splitter or the like and transfers the received optical signal to the optical signal input / output unit 252 through a designated port, May be integrated into one port and transmitted through the optical line 300.

The module control unit 254 is a part for controlling the overall operation of the optical transmission module 250. The module control unit 254 controls the overall operation of the optical transmission module 250 by a signal processing unit such as a microprocessor or a microcontroller unit And the optical signal transmission unit 253 or to transmit control signals for controlling the operation of the signals. The module control unit 254 can control the driving of the OTDR circuit to perform the OTDR measurement. The module control unit 254 may include a storage unit 255 and / or an operation unit 256. The storage unit 255 and the operation unit 256 provided in the optical transmission module 250 may share or replace some of the functions of the storage unit 215 and the operation unit 216 of the main body 210. [ That is, the optical transmission module 250 itself may include a storage unit 255 and an arithmetic unit 256 to store OTDR data and programs, and to perform OTDR measurement. The optical transmission module 250 may use a type not including the storage unit 255 and / or the operation unit 256. [

On the other hand, the remote optical transmission apparatuses 400a to 400c may have the same configuration as the central optical transmission apparatus 200 except for a configuration to be connected to the control apparatus 100. [

1, when the optical transmission devices 200 and 400a to 400c are connected to each other in a closed loop or ring structure as shown in FIG. 1, each of the optical transmission devices 200 and 400a to 400c has a structure shown in FIG. 1 And two optical transmission modules 250 connected to both optical lines 300, respectively. 2, only the optical transmission module 250 connected to one remote optical transmission device 400a is shown, but the optical transmission module 250 connected to the other remote optical transmission device 400c has the same configuration, The city related to this will be omitted for convenience of explanation. When the optical transmission devices 200, 400a to 400c are connected in a point-to-point or serial structure such as a bus type or a linear type, the central optical transmission device 200 and the remote optical transmission device located at the end are connected to one optical transmission module 250 may be provided. The optical transmission module 250 may be installed in a number equal to or greater than three.

Hereinafter, the operation of the optical line monitoring system 1000 according to an exemplary embodiment of the present disclosure including the optical transmission apparatus 200, 400a to 400c of the above-described configuration will be described.

3 is a block diagram showing an embodiment of OTDR measurement processing executed by the optical transmission apparatuses 200, 400a to 400c having the optical transmission module 250 of FIG. 2. FIG. FIG. 5 is an exemplary screen in which a fault occurrence point on the optical line specified based on the OTDR measurement result is displayed on the electronic map of the GIS system.

3 to 5, the control apparatus 100 is connected to the central optical transmission apparatus 200 through a wired / wireless network and the central optical transmission apparatus 200 is connected to the remote And may be connected to the optical transmission devices 400a to 400c.

The GIS information such as the installation location and coordinates of each optical transmission device, the installation path and length of the optical line, and the like are inputted at the time of installing the optical transmission devices 200 and 400a to 400c and the end of the optical line 300 is opened The OTDR function of the central optical transmission apparatus 200 may be executed to measure the length of the optical line 300 and store the data, and then the remote optical transmission apparatus 400a may be connected. Other remote optical transmission devices 400b and 400c may also be connected in turn in the same manner. The GIS information, the length data of the optical line, and the like can be recorded and stored in the database of the NMS and / or each optical transmission device.

The data and / or control command transmitted from the control apparatus 100 is converted into an optical signal by the optical transmission module 250 (see FIG. 2) provided in the central optical transmission apparatus 200, The optical signals transmitted from the remote optical transmission apparatuses 400a to 400c through the optical line 300 are transmitted to the remote optical transmission apparatuses 400a to 400c through the central optical transmission apparatus 200 And can be transmitted to the control apparatus 100. The optical transmission module 250 can transmit and receive optical signals between the remote optical transmission devices 400a to 400c.

Also, during optical data transmission / reception, each of the optical transmission devices 200 and 400a to 400c determines whether the signal level of the data transmission / reception light transmitted / received through the optical transmission module 250 is within a normal level range, Can be monitored at all times. 4, the power value P of the optical signal transmitted / received through the optical transmission module 250 is detected and stored in the database of the storage units 215 and 255 in advance with the reference value Px stored in advance After the comparison, if it is determined that the power value P of the optical signal indicates a value equal to or larger than the reference value Px, normal data transmission / reception can be continued. This monitoring can be performed by the main body 210 and / or the optical transmission module 250 of each of the optical transmission devices 200, 400a to 400c.

When a fault such as line disconnection occurs at an arbitrary point on the optical line 300, the state or signal level of the optical signal transmitted or received through the optical transmission module 250, for example, the power value P of the optical signal, May be smaller than a predetermined reference value Px at which normal data transmission and reception is difficult. That is, if a connection failure occurs due to disconnection or breakage on the optical line 300, even if the data signal is not received or received, the power value P of the optical signal falls below the reference value Px It may be reduced to a range of an abnormal level.

The power value of the optical signal for determining the abnormal level of the optical signal may be, for example, the receiving sensitivity of the received light or the output intensity of the transmitted light, but the present invention is not limited thereto. Can be used.

The reference value Px for determining the abnormal level can be set variously by the user in consideration of factors such as the type of the optical transmission module, the commercial output of the transmission / reception light, etc., according to the situation or need. For example, it is possible to determine the abnormal level by setting the reference value Px such that the dB value of the light intensity falls below the normal commercial range, or the reference value of the commercial range falls by 10% or more.

The reference value Px may be stored in the storage unit 215 of the main body 210 or the storage unit 255 of the optical transmission module 250. [ The reference value Px stored in the storage units 215 and 255 is compared with the measured value of the optical signal in the operation unit 216 of the main body 210 and / or the operation unit 256 of the optical transmission module 250 itself, Level or an abnormal level.

An abnormal signal can be generated inside the optical transmission module 250 or the main body 210 when it is determined that the power value P of the optical signal becomes smaller than the reference value Px and is at an abnormal level. When an abnormal signal is generated, the device control unit 214 can execute the OTDR program stored in the storage unit 215 and execute control to start the OTDR self-measurement described later. The OTDR self-measurement may also be performed by the optical transmission module 250 itself.

The power value P of the optical signal can be measured in both transmission light and reception light transmitted to and received from each of the optical transmission devices 200 400a to 400c. For example, as shown in FIG. 3, when a line break occurs between a remote optical transmission apparatus 400a on the one side and a remote optical transmission apparatus 400b on the other side, The apparatuses 400a and 400b can detect that the power value P of the transmitted light or the received light has decreased respectively and each of the remote optical transmission apparatuses 400a and 400b can detect the position where the line disconnection occurred Self-OTDR can perform self-measurement.

When the OTDR self-measurement is started, each of the remote optical transmission devices 400a and 400b can transmit the OTDR measurement light along the check path or the interval (3 < 3 >) through the optical transmission module 250. The OTDR measurement light is scattered and reflected at the line disconnection position of the optical line 300 and can be received as the OTDR receive light along the reverse path (4) of the check path (3). When the OTDR receive light is received, each of the remote optical transmission devices 400a and 400b can calculate the distance to the line disconnection position by analyzing the OTDR received light. Each of the remote optical transmission apparatuses 400a and 400b performs the self-measurement of the OTDR a plurality of times to calculate an average value, thereby eliminating signal noise and detecting a more accurate line disconnection position.

This calculation result is compared with data stored in the databases of the storage units 215 and 255 of each of the remote optical transmission devices 400a and 400b to generate OTDR data on the distance or position to the point of occurrence of the failure . The OTDR data may include at least the OTDR measurement data and the ID information of the corresponding device. The created OTDR data is transmitted to the central optical transmission apparatus 200 along paths (1), (2) and (2) where no defects are generated from the respective remote optical transmission apparatuses 400a and 400b together with the trouble alarm signal, . ≪ / RTI > When the optical transmission devices 400a and 400b located on both sides of the front end and the rear end based on the point where the defect occurs perform self-measurement of the OTDR, the values measured by the two optical transmission devices 400a and 400b are averaged More accurate defect location can be found.

When the OTDR data is received from each of the optical transmission devices 400a and 400b, the control apparatus 100 transmits an alarm signal, identifies the defect position, and displays it as geographical information on the electronic map of the GIS system as shown in FIG. can do. Therefore, the user can quickly and easily grasp the position of the defect on the optical line in real time, and take corrective action in a timely manner.

As described above, the optical line monitoring system 1000 according to the present invention monitors the status of data transmission / reception light transmitted / received through the optical line 300 by each of the optical transmission devices 200 and 400a to 400c at the terminal end The OTDR self-measurement is immediately performed at the time of detection, and the result is reported to the control device 100, so that the failure on the optical line 300 can be grasped in real time so that the failure can be promptly dealt with.

6 is a flowchart showing a control routine for executing the OTDR self-measurement.

Referring to FIG. 6, it can be detected whether or not the power value P of the optical signal is equal to or greater than the reference value Px (step S1). If the power value P of the optical signal is greater than or equal to the reference value Px (Yes) as a result of the detection, it can be determined to be at the normal level and the OTDR can be terminated without performing the self-measurement. If it is less than the reference value Px (No), it is judged as an abnormal level and an abnormal signal is transmitted (step S2), and the OTDR measurement can be started (step S3).

When the OTDR measurement is started, the OTDR measurement light is generated from the optical signal input / output unit 252 of the optical transmission module 250 shown in FIG. 2 and can be transmitted through the optical line 300. The OTDR measurement light emitted from the optical transmission module 250 is reflected back from the defect position on the optical line 300 and can be returned to the optical transmission module 250 as the OTDR reception light. When the OTDR receive light is received, the one-way distance of the OTDR measurement light, that is, the distance to the defect position on the optical line 300, can be calculated from the speed of the OTDR measurement light and the round trip time. The fault location or fault location on the optical line 300 can be more accurately specified by averaging this OTDR measurement several times.

When the defective position of the optical line 300 is determined by the OTDR measurement (step S4), OTDR data can be created by grouping the position information of the defective position, the ID information of the device, and the like. The OTDR data can be created in an optical communication data format conforming to the standard SNMP (Simple Network Management Protocol) described later. Finally, the OTDR data can be sent out and an alarm signal can be sent and the OTDR self-measurement routine can be terminated. The alarm signal may be made prior to the transmission of the OTDR data. If it is determined in step S4 that the defect position of the optical line 300 is not completed, the process returns to step S3 to repeat the OTDR measurement.

Although the optical transmission devices 200 and 400a to 400c are connected in a ring structure in FIG. 3, when the optical transmission devices 200 and 400a to 400c have a serial structure, The self-measurement of the OTDR can be performed in the same manner, except that it is performed only through the one-way inspection path (③③, ④④) and the reporting path (①①) by the remote optical transmission apparatus 400a.

According to the optical line monitoring system 1000 according to the present disclosure, since the optical line monitoring can be integrated and operated by one network management system through the data communication system, the entire system configuration and wiring can be simplified, And the number of components can be significantly reduced. Further, since the data transmission / reception light and the OTDR measurement light are made of light having the same wavelength, it is possible to perform the OTDR measurement processing for inspection of the optical line through the optical communication line for data communication without installing a separate optical monitoring line. In addition, since unnecessary components such as a wavelength division filter can be removed, insertion loss and connection loss can be greatly reduced, and the number of components such as an amplifier can be greatly reduced. In addition, The correction operation can be performed very easily.

In addition, since each optical transmission apparatus is equipped with an optical transmission module having an OTDR function capable of determining OTDR measurement timing and performing OTDR self-measurement, when a defect such as disconnection or breakage is issued on the optical line The optical transmission device can self-diagnose and report the OTDR self-measurement, so that the position of the defect on the optical line can be specified immediately upon occurrence of the failure. Accordingly, the user can immediately grasp the position of the defect on the optical line in real time and take a quick response. Also, the optical line monitoring system can display the result of the OTDR measurement processing performed by the optical transmission apparatus as geographical information on the electronic map of the GIS system, thereby allowing the user to easily visually recognize the position of the defect on the optical line.

On the other hand, according to the conventional optical line monitoring system, unauthorized persons approach the manhole on the optical line or the optical connection enclosure installed in the processing, and can not open the unauthorized access and hack or damage the optical line.

The optical line monitoring system 1000 according to the present disclosure can be realized by providing the monitoring unit 520 on the optical connection enclosures 500a to 500d provided on the optical line 300 to perform the OTDR measurement processing, 500a to 500d) can be monitored for unauthorized opening or damage. Since the configurations of the optical connection enclosures 500a to 500d are the same, only one optical connection enclosure 500a will be described below.

Figs. 7A and 7B are perspective views showing the closed state and the open end state of the optical connector 500a according to the exemplary embodiment of the present disclosure, respectively.

Referring to FIG. 7A, the optical connector 500a may be a substantially hollow box type container made of an insulating member. The optically connected housing 500a includes a box body 511 having one side opened and a box flange 511a and a cover body 512 having a cover flange 512a and the other side opposite to the box body 511, ). The box body 511 and the cover body 512 can be joined to each other in an air-tight manner by contacting the box flange 511a and the cover flange 512a by contacting them.

The optical connector 500a accommodates the optical cable and protects the optical cable by preventing foreign matter and moisture from entering from the outside. The optical connection enclosure 500a may be installed at a connection point on the optical line 300 where optical cable bundles extending from the optical transmission devices 200 and 400a to 400c are connected to each other. The optical cable bundles on both sides connected to each other in the optical connection housing 500a can be accommodated in the optical connection housing 500a and connected to each other in a sealed state.

For example, in a state in which the optical cable bundle at the front end and the rear end of the optical connection housing 500a is fixed to the inside of the optical connection housing 500a by a predetermined fixture (not shown) It is possible to connect the optical cable bundles at both ends communicably to each other by connecting the optical cable cores at one end to the optical cable cores at the other end after the cores are taken out and individualized.

One or more optical cable cores 301 out of the optical cable cores drawn out from the optical cable bundle may be installed in the monitoring unit 520 inside the optical connector 500a. The monitoring unit 520 detects that the optical cable core 301 installed in the monitoring unit 520 in the optical connection housing 500a is bent or spaced to be back scattered / It is possible to provide an enclosure monitoring function for allowing the optical connection enclosure 520a, which is opened endlessly, to be detected as a defect position on the optical line 300 by OTDR measurement.

For example, the optical cable core 301 may be installed in the monitoring unit 520 as shown in FIG. 7B. The monitoring unit 520 may include a support (not shown) for holding the optical cable core 301 in a predetermined shape. The support may have a shape that includes a bend that causes backscattering for the OTDR measurement light. The bent portion may be a portion curved beyond a detectable curvature as a bending point on the optical line due to back scattering of the OTDR measurement light. The optical cable core 301 may be attached or fixed to the support body including the bent portions so that the optical cable core 301 is provided with at least one bent portion 301a (a plurality of raised portions and valley portions in Fig. 7B) Shape (first shape). The support may be formed of a flexible resilient material that can be gently bent or bent. Accordingly, when the external force is applied, the support body can be deformed into a gently curved shape (second shape) as shown in FIG. 7A. When the external force is released, the support body can be elastically restored to a sharply bent shape as shown in FIG.

The monitoring unit 520 may include a support portion 521 provided on the box body 511 and a coupling portion 522 provided on the cover body 512. The optical cable core 301 provided in the monitoring unit 520 may be disposed on the supporting unit 521 while being supported by the supporting unit. The support portion 521 may be a tubular member for accommodating the optical cable core 301. [ The coupling portion 522 may have a curved member 522a having a convexly curved shape toward the optical cable core 301. [ The curved member 522a may be made of a material such as an insulating rubber having a rigidity to such a degree that it can be curved by pressing the supporting body. When the coupling portion 522 is coupled to the support portion 521, the curved member 522a gently presses the optical cable core 301 together with the support so that the optical cable core 301 held by the support is pushed by the curved member 522a And can be curved along the shape as shown in Fig. 7A. The supporting portion 521 and the engaging portion 522 of the monitoring portion 520 are provided on the box body 511 and the cover body 512 respectively and the box body 511 and the cover The optical cable core 301 is curved as shown in FIG. 7A and is accommodated between the supporting portion 521 and the engaging portion 522 of the monitoring portion 520. In this state, Can be closed.

Here, the curvature of the optical cable core 301 curved by the curved member 522a may be set within a range that does not cause back scattering when OTDR measurement light is transmitted. In other words, the radius of curvature of the curved member 522a that curves the optical cable core 301 may be greater than the radius of curvature (or its threshold value) that causes backscattering when transmitting OTDR measurement light. Accordingly, when the optical cable core 301 is held in the optical connection housing 500a in a curved state, the enclosure monitoring function by the back scattering in the monitoring unit 520 does not operate. Therefore, It can be operated normally without being measured in position.

At this time, if the optical connector 500a is opened by someone or an external impact is applied to the optical connector 500a, and the box body 511 and the cover 512 are separated from each other, The optical cable core 301 can be resiliently restored to the shape as shown in FIG. 7B by the support while the engaging portion 522 is separated from the supporting portion 521. The optical cable core 301 restored to the shape along the support can be restored to a shape bent beyond the curvature that causes back scattering with respect to the OTDR measurement light. Thereby, the endlessly opened optical connector 500a can be detected as a defect position on the optical line 300 by OTDR measurement.

The monitoring unit 520 monitors the optical cable core 301 in the optical cable core 301 until the OTDR measurement light is detected as a defective part. May be linear, curved, or otherwise variously planar or cubic.

The optical cable core 301 is detected as a defective part by restoring the optical cable core 301 to its original shape by the support body. 500a) monitoring dummy line, and the monitoring unit 520 may be configured to detect a defective portion by separating a part of the optical cable core 301. [ For example, when a coupler or a connector (not shown) is provided in the monitoring unit 520 and the coupler and the connector are spaced apart from each other when the optical connection housing 500a is opened endlessly, It can be configured to short-circuit.

The monitoring unit 520 may be implemented in a configuration in which the optical cable core 301 is fitted to an installation groove (not shown) formed in the box body 511 in a state in which the optical cable core 301 is provided on the elastic support body and the cover body 512 is covered have. In this case, the monitoring unit 520 can be simply formed without a separate mounting member such as the supporting unit 521 and the engaging unit 522. [ Further, the support is not limited to the elastic support, and various other materials or means that can be restored to the original shape when predetermined physical and electrical conditions such as shape memory materials are applied may be employed.

The monitoring unit 520 may be provided in the form of a monitoring module in which the optical cable core 301 is housed inside the monitoring unit 520 and both ends are exposed to the outside as shown in FIG. In this case, the monitoring unit 520 is installed in the optical connection enclosure 500a, and the both ends of the optical cable core 301 are connected to a connection terminal (not shown) provided in the optical connection case 500a, A monitoring unit 520 may be provided.

Although the monitoring unit 520 is described as being operated when the optical connector 500a is opened or damaged, the monitoring unit 520 may not be operated when a legitimate user opens the optical connector 500a. 7A and 7B, when a legitimate user uses the opening / closing means such as a mechanical key or an electronic button key to open the optical connector 500a, It is possible to open the optical connection housing 500a in a state where the installation state of the monitoring unit 520 is maintained as it is by releasing the connection between the unit 520 and the box body 511 or the cover body 512 have.

Hereinafter, the operation of the optical line monitoring system 1000 according to an exemplary embodiment of the present disclosure including the optical connector 500a having the above-described configuration will be described.

8 is a block diagram showing an embodiment of an OTDR measurement process at the time of occurrence of an event that the optical connector 500a is opened uninterrupted.

Referring to FIG. 8, the optical line monitoring system 1000 may be installed in the same manner as described with reference to FIG. An optical connector 500a such as that shown in FIGS. 7A and 7B may be disposed at an optical cable connection point on the optical line 300. The GIS information of the optical connection enclosure 500a is input at the time of installation and the OTDR function of the optical transmission apparatus adjacent to one side or both sides is performed to perform the OTDR function of the optical transmission line 500a 300 can be stored. Other optical connection enclosures can be installed in the same manner. At least one optical cable core 301 of the optical cable bundle connected through the optical connection housing 500a may be installed in the monitoring unit 520. [ The monitoring unit 520 may be installed inside the optical connector 500a in the form of a monitoring module shown in FIG. 7A.

Each of the optical transmission devices 200 and 400a to 400c can monitor the signal level of data transmitted / received through the optical transmission module 250 during data transmission / reception. When there is no abnormality in the optical connection housing 500a, the change of the optical signal by the monitoring unit 520 is not detected. However, when an event such as unauthorized opening of the optical connection housing 500a occurs, A change in the state of the optical signal due to back scattering in the monitoring unit 520 can be detected by the optical transmission devices 400a and 400b on both sides of the optical connection enclosure 500a. Thus, the above-described OTDR self-measurement can be performed by each of the optical transmission devices 400a and 400b. That is, each of the remote optical transmission devices 400a and 400b transmits the OTDR measurement light along the inspection path (3③) through the optical transmission module 250 and transmits the OTDR measurement light along the reverse path (4) OTDR data received backward from the monitoring unit 520 of the connection housing 500a is calculated and the OTDR data about the position of the endless optical connection body 500a is calculated by calculating an average value obtained by repeating the OTDR self- , And report it to the control device (100) through the reporting path (①①, ②②) together with the alarm signal. Accordingly, the unauthorized opening of the optical connector 500a and its position can be promptly reported to the user in real time.

Each of the optical transmission devices 200 and 400a to 400c may periodically perform the above-described OTDR self-measurement during data transmission and reception to check the state of the optical connection enclosures 500a to 500d. 8, the optical transmission devices 400a and 400b generate OTDR measurement light intermittently or continuously through a light transmission module 250 at predetermined intervals or intervals of several ms to several seconds, And can be transmitted along the path (3). Such OTDR period measurement can be performed by all the optical transmission devices adjacent to the optical connection enclosure or by the optical transmission devices on either side.

When there is no special event in the optical connection enclosure 500a, OTDR receive light may not be detected in either of the remote optical transmission devices 400a and 400b located on both sides of the optical connection housing 500a. However, when an event that the optical connection enclosure 500a is opened unilaterally, the OTDR receive light may be detected along the reverse path (4④) of the inspection path (3③) to the remote optical transmission apparatuses 400a and 400b on both sides . When the OTDR receiving light is detected, each of the remote optical transmission apparatuses 400a and 400b analyzes the OTDR received light to generate OTDR data, and then transmits the OTDR data to the control apparatus 100 through the reporting paths (1) and Can be reported. Even if the optical fiber bundle 500a is opened without interruption, if there is no defect or obstacle in the optical line 300 itself, the OTDR data may be reported through a normal data transmission / reception path.

According to the optical line monitoring system 1000 according to the exemplary embodiment of the present invention described above, the monitoring unit 520 is installed inside the optical connection enclosure 500a. When the optical connection enclosure 500a is closed, Since the optical cable core 301 is smoothly expanded at the portion 520, the monitoring unit 520 does not generate back scattering, so that a failure signal on the optical line 300 may not be generated when the OTDR is measured. The supporting part 521 and the engaging part 522 of the monitoring part 520 are separated from each other by the separation of the box body 511 and the lid body 512 and the supporting part 521 The elasticity of the elastic support body may cause deformation of the optical cable core 301. In the modified optical fiber cable core 301, backscattering occurs to cause a change in optical signal loss, and thus the signal level of the optical signal transmitted / received by the optical transmission devices 200 and 400a to 400c is smaller than the set reference value Px Can be degraded. Thus, the optical transmission devices 200 and 400a to 400c are automatically switched to the OTDR self-measurement mode, the distance is measured using the OTDR function, and the measured values are calculated to determine the position of the uninterrupted optical connection housing 500a You can trace.

On the other hand, in the case where disconnection or breakage of the optical line does not occur at once, and minute damage is gradually accumulated over a long period of time, defects of the optical line can hardly be detected easily.

The optical line monitoring system 1000 according to the present disclosure warns the user to continuously observe a slight defect point early in the OTDR cycle measurement that is likely to damage the optical line, Preemptive precautions can be taken before the breakdown. Hereinafter, this OTDR cycle measurement will be described in detail

9 is a block diagram illustrating OTDR period measurement using optical line monitoring system 1000 in accordance with an exemplary embodiment of the present disclosure. 10 is an exemplary screen showing the state value of the observation point on the electronic map of the GSI system.

Referring to FIGS. 9 and 10, the above-described optical line monitoring system 1000 can be installed. The NMS program of the control apparatus 100 requests the transmission of the status value to each optical transmission apparatus 200, 400a to 400c connected to the optical line 300 every cycle or interval of several ms to several seconds, (1), (2) and (3). The optical transmission devices 200 and 400a to 400c that have received the status value perform self-measurement of the OTDR through the inspection paths (③③ and ④④) of the optical line 300 while continuing to transmit and receive data, It can be reflected to the address value and transmitted to the control apparatus 100. Each of the optical transmission devices 200 and 400a to 400c can perform OTDR measurement together with transmission / reception of data through the same optical line 100 without stopping data transmission / reception. The status values are information indicating whether or not there is an abnormality in each of the optical transmission devices 200 and 400a to 400c, a signal state or level of the data transmission / reception light, measurement data (OTDR self measurement) (Including data that calculates the distance to the position), and the like. The status value request of the control apparatus 100 and the responses of the optical transmission apparatuses 200 and 400a to 400c may be transmitted in a data format according to the standard SNMP protocol.

Table 1 below shows an example of a communication data format for requesting an OTDR measurement value to an optical transmission apparatus being operated by the control apparatus 100. The communication protocol conforms to the standard SNMP and the initial setting of the apparatus can be set to the SNMPv2c specification. The OID (Object Identifier) address of the equipment with the shorted line can be included in the address [0x4B ~ 0x5C] and can be requested by SNMP GET operation. The number of OID addresses that can obtain the OTDR measurement value of the device is designed by the number of ports supported by the device, and only the optical or combo port can receive the OTDR value.

Request Address 0x00 to 0x0D 0x0E to 0x21 0x22 ~ 0x29 0x2A to 0x4A 0x4B to 0x5C 0x5D to 0x5E Length 14 19 8 32 11 2 Descr Interface IP Info 1 IP Info 2 SNMP Format Header Object Fixed Data

Interface: SNMP protocol format.
IP info 1: SNMP protocol format. IP address format of the target device 1.

IP info 2: SNMP protocol format. IP address format of the target device 2.

Header: SNMP protocol format. SNMP attribute status.

Object: OTDR OID address information. (Same as the number of ports.)

Fixed Data: Fixed data. 05h, 00h

Table 2 below is an example of the response data of the optical transmission device regarding the information request of the OTDR OID address transmitted from the integrated NMS, where the object (OID) at the address [0x53 ~ 0x64] is an address for confirming that it is the same as the OID requested by the NMS , And the value after the fixed data (2 bytes) may be data expressing the OTDR measurement value (failure occurrence point on the optical line). The length of the OTDR data is variable and can be displayed as a string in the form of an ASCII code.

Response Address 0x00 to 0x0D 0x0E to 0x21 0x22 ~ 0x29 0x2A to 0x52 0x53 to 0x64 0x65 ~ 0x66 0x67 to 0x (n) Length 14 19 8 40 17 2 (n): variable Descr Interface IP
Info 1 IP
info 2 SNMP Format Header Object Fixed Data OTDR Value

Interface: SNMP protocol format.
IP info 1: SNMP protocol format. IP address format of the target device 1.

IP info 2: SNMP protocol format. IP address format of the target device 2.

Header: SNMP protocol format. SNMP attribute status.

Object: OTDR Object Identifiers (OID) address information.

Fixed Data: Fixed data. 05h, 00h

OTDR Value: Convert to ASCII code.

Eg '31 30 30 20 20 20 6d 65 74 65 72 73 '->' 100 meters'

Meanwhile, the control apparatus 100 can receive and analyze status values from the respective optical transmission apparatuses 200 and 400a to 400c while sequentially communicating with the optical transmission apparatuses 200 and 400a to 400c registered in the NMS. The state of each device can be discriminated and the state of the data transmission light and the optical line 300 can be checked.

As a result of the analysis of the state value, the points of occurrence of faults such as disconnection or breakage of the optical line 300 and unauthorized opening of the optical connection enclosures 500a to 500d can be immediately detected by the OTDR measurement. In addition, although such a degree of obstacle has not been reached, a point at which a minute change in the optical signal is detected, such as low optical signal level or back scattering, can be set as the observation point. This observation point can be set at a single point or a plurality of points. There is a possibility that small damage caused by aging of equipment or optical line or fatigue destruction may gradually accumulate and gradually develop into more serious obstacles or defects. Therefore, in order to take preemptive preventive measures, .

The control apparatus 100 controls the position and state value data of the observation point on the electronic map of the GIS system in which the positions of the optical line 300 and the optical transmission devices 200 and 400a to 400c are indicated as shown in Fig. It can be displayed in real time. In addition, it is also possible to repeatedly receive and analyze the state value at regular intervals to store the time-dependent change of the state value at the observation point in a database or to display it in a visual form such as a graph on an electronic map of the GIS system. In addition, if the status value or its change according to a partial area or the entire length of the optical line 300 is collected in real time or according to a temporal change, the optical line 300 can be routinely monitored and maintained.

According to the optical line monitoring system 1000 according to the exemplary embodiment of the present invention described above, by performing the OTDR cycle measurement, it is possible to detect and continuously observe a minute defect point where a failure on the optical line is likely to occur Preventive measures can be taken to ensure the best condition of the optical line at all times before a sudden break or damage occurs.

On the other hand, an optical transmission device installed in the field may cause a power down or an operation failure due to an accident such as a lightning stroke or a power failure. In this case, since optical line monitoring can not be performed, There is a problem that the point can not be confirmed.

In the optical line monitoring system 1000 according to the present disclosure, even when a failure occurs in the optical transmission devices 200 and 400a to 400c due to an accident such as a lightning strike or a power failure, The transmission apparatus can always accurately detect the disconnection or failure point of the optical line 300 by performing the OTDR bypass measurement. Hereinafter, the case where the power of one of the remote optical transmission devices 400a to 400c is turned off will be described in detail as an example of performing the OTDR bypass measurement.

11A is a block diagram exemplarily showing the installation state of the remote optical transmission devices 400a to 400c according to the length of the optical line 300. FIG. 11B is a block diagram of the optical line monitoring system 1000 of FIG. FIG. 7 is a block diagram showing an embodiment of path measurement processing. FIG.

Referring to FIGS. 11A and 11B, each of the remote optical transmission devices 400a to 400c may be installed on the optical line 300 in a manner similar to that described with reference to FIG. For example, each of the remote optical transmission devices 400a to 400c may be installed on the optical line 300 at an interval of 10 Km or an interval. In the installation of each of the remote optical transmission devices 400a to 400c, the OTDR function of the optical transmission device positioned at the front end of the installed optical transmission device is performed while the ends of the optical transmission line 300 are opened, It is possible to store the measurement data according to the length of the memory 300. Thereafter, each of the remote optical transmission devices 400a to 400c may be sequentially connected.

Each of the remote optical transmission devices 400a to 400c may include a bypass circuit. The bypass circuit may be implemented in the form of a switching circuit that short-circuits the optical line 300 connected to the front and rear ends of the remote optical transmission devices 400a to 400c. The bypass circuit may be installed in front of the optical transmission module 250 provided in the remote optical transmission devices 400a to 400c. The bypass circuit can be configured so that when the power is turned off, the circuit is open, but the circuit is connected when the power is down. Accordingly, the optical signal passing through the optical line 300 can be bypassed without passing through the failed optical transmission device.

It is possible to test whether or not the bypass circuit is normally operated at the time of installation of each of the remote optical transmission devices 400a to 400c and to store the data of the bypass path. For example, before the remote optical transmission device 400c at the distal end is connected to the optical line 300, the power of the remote optical transmission device 400b is turned down and the end of the optical line 300 is opened, It is possible to store the OTDR data by executing the OTDR function of the remote optical transmission apparatus 400a of FIG. Accordingly, it is possible to confirm whether the bypass circuit is normally operating when the remote optical transmission apparatus 400b fails, and it is possible to obtain the OTDR measurement data of the optical line 300 according to the bypass path as the bypass data. The length of the optical line 300 between the remote optical transmission devices 400a and 400c at both ends along the bypass path can be set to 20 Km.

When the power of the remote optical transmitting apparatus 400b is down due to a power failure, a lightning strike, or a self-failure, the bypass circuit included in the remote optical transmitting apparatus 400b can be automatically connected. When the bypass operates, the optical line 300 connected to both ends of the remote optical transmission device 400b is directly connected without going through the remote optical transmission device 400b, and the optical signal can pass through the bypass circuit.

The remote optical transmission devices 400a and 400c at both ends adjacent to the remote optical transmission device 400b whose power is down have detected a temporary decrease in optical signal level and the like so that the power of the remote optical transmission device 400b is down, Can be detected. Accordingly, the remote optical transmission devices 400a and 400c at both ends can automatically update or switch the data on the length of the optical line 300 to data along the bypass path. The remote optical transmission apparatuses 400a and 400c can transmit an alarm signal indicating that the power of the remote optical transmission apparatus 400b is down and the bypass function is in operation. The NMS system can display and alert the occurrence of the failure of the optical transmission device 400b on the electronic map of the GIS system. In addition, the NMS system can automatically set the optical line section according to the bypass path based on the stored database, and can update or switch the data of the optical line to data according to the bypass path.

At this time, when the optical line 300 is disconnected at a midpoint between the remote optical transmission apparatuses 400a and 400c at both ends, the remote optical transmission apparatuses 400a and 400c located on both sides of the line disconnection position are transmitted and received It is possible to immediately perform the self-measurement of the OTDR by sensing a decrease in the signal level of the data optical signal or the like. The OTDR self-measurement can be made via the bypass path. Each of the remote optical transmission devices 400a and 400c can generate OTDR data based on the obtained OTDR measurement value and the database according to the bypass path.

For example, when line breakage occurs at a distance of 17 km from the remote optical transmission apparatus 400a at the front end, an error or an error of the OTDR data may occur based on the first data value in which the length of the optical line 300 is set to 10 km . In the present disclosure, the remote optical transmission apparatus 400b with the power down function immediately activates the bypass circuit, and the remote optical transmission apparatuses 400a and 400b at both ends performing the OTDR measurement sense the operation of the bypass The optical line data is updated or converted to data according to the bypass path. Therefore, even when the OTDR measurement value is acquired along the bypass path, there is no error or error in the creation of the OTDR data.

When the remote optical transmission apparatus 400b fails and the power is restored, the bypass circuit of the remote optical transmission apparatus 400b is opened and the bypass function can be interrupted. Accordingly, the remote optical transmission apparatuses 400a and 400c located at both ends of the remote optical transmission apparatus 400b detect that the power is restored and the bypass function is interrupted, and the optical line data is automatically Or the like.

As described above, according to the optical line monitoring system 1000 according to the present disclosure, even when the optical transmission apparatus fails or fails due to a lightning stroke or a power failure in the field, the OTDR bypass mode is executed to always detect the defect position of the optical line can do.

As described above, the optical transmission / reception module, the optical transmission device, and the optical line monitoring system according to the present disclosure can be applied to an optical communication system, thereby contributing to improvement in price / performance. Further, the software for executing the optical line monitoring method according to the present disclosure may be implemented in a control logic or a program including instructions executable by a computer, such as a program module executed by a computer, . ≪ / RTI > Computer readable media can be any available media that can be accessed by a computer, and can include both volatile and nonvolatile media, removable and non-removable media. The computer-readable recording medium may also include media including both computer storage media and communication media such as a system server, a PC, a mobile device such as a tablet or a cellular phone, and the like. Computer storage media may include both volatile and nonvolatile, removable and non-removable media implemented in any method or technology for storage of information such as computer readable instructions, data structures, program modules or other data. Communication media typically may include computer readable instructions, data structures, program modules, or other data in a modulated data signal such as a carrier wave, or other transport mechanism, and may include any information delivery media.

The present disclosure is not limited to the above-described embodiments, and various modifications and changes may be made by those skilled in the art. Furthermore, each of the components and methods, the respective applications, and the modifications thereof described in the above-described embodiments can be suitably combined with each other or separately implemented separately. Accordingly, the scope of the present invention should be broadly interpreted to include all modifications and other embodiments, including the technical scope of the following claims and their equivalents.

100: control device 200: central optical transmission device
210: main body 211: signal control processor
212: signal multiplexing unit 213: input /
214: device control unit 215, 255: storage unit
216, 256: Operation unit 220:
250: optical transmission module 251: composite signal processor
252: Optical signal input / output unit 253: Optical signal transmission unit
254: module control unit 300: optical line
301: optical cable core 301a: bent portion
400a to 400c: remote optical transmission devices 500a to 500d: optical connection enclosure
511: box body 511a: box body flange
512: cover body 512a: cover body flange
520: monitoring unit 521:
522: engaging portion 522a:

Claims (11)

As a smart optical line monitoring system integrated and operated in an optical communication system,
The optical communication system includes:
A control unit for controlling the optical communication system,
A central optical transmission device connected to the control device,
And a remote optical transmission device connected to the central optical transmission device via an optical line,
Each of the optical transmission devices includes a control unit and an optical transmission module for transmitting and receiving data light for optical communication through the optical line,
Wherein the optical transmission module transmits and receives the data light through the optical line and transmits and receives OTDR measurement light for detecting a defect position or a disconnection position on the optical line through the optical line for transmitting and receiving the data light,
The OTDR measurement light is light having the same wavelength as the data light,
Wherein the control unit of the optical transmission apparatus further comprises a control unit that notifies the control unit of the optical transmission module that the optical transmission module has received the control signal from the optical transmission module when an abnormality is detected in a predetermined level of the signal of the data light transmitted and received by the optical transmission module The OTDR self-measurement is automatically performed to measure the defect position or the disconnection position on the optical line by transmitting the OTDR measurement light,
Wherein each of the optical transmission devices performs the OTDR measurement for each of the sections adjacent to each of the sections,
Each of the sections being monitored redundantly so that the OTDR measurement is performed by a plurality of optical transmission devices adjacent to both sides of the respective section along the optical line,
A bypass circuit for bypassing the OTDR measurement light is operated to the optical transmission device in which the failure or the failure occurs, and when a failure or failure occurs in at least one of the optical transmission devices, Wherein the control unit of the other optical transmission apparatus is automatically switched to enable the OTDR measurement for an extended section including the OTDR measurement period of the optical transmission apparatus itself and the OTDR measurement period of the failed or failed optical transmission apparatus. Track monitoring system. The method according to claim 1,
Wherein the OTDR data obtained from the OTDR measurement is notified in real time to the control apparatus together with an alarm signal for warning of a defect or disconnection on the optical line. 3. The method according to claim 1 or 2,
The control apparatus transmits a control signal for requesting a status value to at least one of the optical transmission devices,
Each of the optical transmission devices performs the OTDR measurement by the control signal and also reports its own status value including OTDR data and ID information obtained from the OTDR measurement in response to the control signal ,
The control apparatus analyzes the state value reported from each of the optical transmission apparatuses to derive an observation point on the optical line,
Further comprising a geographic information system for exposing the optical line and the position of each of the optical transmission devices on an electronic map,
Wherein the geographical information system visually displays, on the electronic map, a real-time state or a temporal change of the observation point based on the state value together with the position of the observation point. delete delete delete delete delete delete delete delete

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