KR20220076701A - Method for detecting optical level drop section in next generation optical transmission network and apparatus thereof - Google Patents

Abstract

The present invention relates to a method for detecting a failure section in an ROADM-based optical transport network, the method comprising: acquiring information about the optical transport network from a network operating system; collecting optical signal strength data from a plurality of ROADM devices constituting the optical transmission network; detecting a source section that causes an optical level drop of the optical transmission network based on the obtained information on the optical transmission network and the collected optical signal strength data; and providing information on a root section of the detected light level drop to a system operator.

Description

BACKGROUND OF THE INVENTION Field of the Invention

The present invention relates to a method for detecting a failure section in a next-generation optical transport network, and more particularly, to a method for detecting a root section of an optical level pure decrease in an ROADM-based optical transport network.

Wavelength 　Division Multiplexing (WDM) technology is a technology that transmits multiple high-speed signals through wavelength division multiplexing to a single optical fiber, and is currently being applied to most backbone networks and metro networks. In such a WDM transmission network, an OADM (Optical Add/Drop Multiplexer) function that can selectively branch/combine some wavelengths of light without photoelectric conversion and pass some of them is absolutely necessary. In the existing transmission network, the fixed OADM (Fixed OADM) function that can branch/combine optical signals of a fixed wavelength is mainly used. However, network operators who prefer a more flexible network are increasingly demanding a reconfigurable-OADM (ROADM) function that can dynamically respond to changes in circumstances.

ROADM is a function that can reconfigure a network from a remote location and can satisfy both requirements of improving network efficiency and reducing operating costs. ROADM is characterized in that it can change the add or drop wavelength of a node remotely without the input of skilled technicians. Such remote configuration has the advantage of reducing network operation cost. In addition, the remote network setting and line control function through ROADM can be useful not only for initial network installation, but also for maintenance work such as upgrade, which helps reduce operating costs by increasing capacity and reassigning wavelengths. . In addition, if the ASON (Automatic Switched Optical Network) concept is additionally applied, traffic survivability can be guaranteed, and various services can be flexibly accommodated, making it possible to build a dynamic optical network.

ROADM can be broadly divided into switch-based architecture and Broadcast and Select-based architecture. In the early days, the method using a switch was mainly studied, but recently, with the development of the Dynamic Channel Equalizer (DCE), research on the Broadcast and Select method is increasing. Although these two structures can be expressed as the same functional block, there are many differences in loss distribution in the pass path and branch/join path. In particular, the 　Broadcast and Select method using a dynamic channel equalizer (DCE) is very advantageous in accommodating a large number of nodes due to the low loss of the pass path.

On the other hand, ROADM equipment is a long-distance transmission equipment unlike other transmission equipment. And, since the ROADM device transmits the wavelength of light as it is, when the optical signal intensity is changed in one device, the subsequent devices connected thereto are affected by the optical signal intensity from the preceding device. Therefore, when a failure occurs in a specific section of the optical transmission network, it is difficult to detect the failure section.

From the telecommunication service provider's point of view, when operating a service, there is an operation department for each region to operate and manage the equipment, but since other transmission equipment is operated within a narrow area, it is easy to identify the source of the failure. However, since the ROADM equipment is operated within a wide area and there is no separate system for determining the failure, it is difficult to identify the root failure. This is because various types of equipment are often bundled together in a wide area, so it is difficult to identify the source failure because there are cases where various derivative failures occur even in a single source failure or derivative failures occur outside of the jurisdictional area. In addition, in the case of the ROADM-based optical transmission network, the optical level is decreased in a specific section, which is caused by various causes such as optical path disturbance relocation work. Accordingly, there is a problem in that it takes a lot of manpower and time to analyze and take measures for a specific cause. Therefore, there is a need for a method of detecting a root failure section that causes an optical level drop in the ROADM-based optical transmission network.

SUMMARY OF THE INVENTION The present invention aims to solve the above and other problems. Another purpose is to periodically collect optical signal strength data from a plurality of ROADM devices constituting the optical transmission network, and accurately detect the source section of the optical level drop in the optical transmission network based on the collected optical signal strength data. To provide a method and an apparatus therefor.

According to an aspect of the present invention to achieve the above or other objects, the method comprising: obtaining information about an optical transport network from a network operating system; collecting optical signal strength data from a plurality of ROADM devices constituting the optical transmission network; detecting a source section that causes an optical level drop of the optical transmission network based on the obtained information on the optical transmission network and the collected optical signal strength data; and providing information on a source section of the detected light level drop to a system operator.

According to another aspect of the present invention, there is provided a data collection unit for acquiring information about an optical transport network from a network operating system and collecting optical signal strength data from a plurality of ROADM devices constituting the optical transport network; a failure detection unit configured to detect a root section causing an optical level decrease of the optical transmission network based on the obtained information on the optical transmission network and the collected optical signal strength data; and a failure notification unit that provides information on a root period of the detected light level drop to a system operator.

According to another aspect of the present invention, the process of obtaining information about an optical transport network from a network operating system; collecting optical signal strength data from a plurality of ROADM devices constituting the optical transmission network; detecting a source section that causes an optical level drop of the optical transmission network based on the obtained information on the optical transmission network and the collected optical signal strength data; And it provides a computer program stored in a computer-readable recording medium to execute the process of providing information on the source section of the detected light level to the system operator to the system operator.

A method for detecting an optical level drop section in a next-generation optical transmission network according to embodiments of the present invention and an effect of the device will be described as follows.

According to at least one of the embodiments of the present invention, based on the optical signal strength data periodically collected from a plurality of ROADM devices, by quickly and accurately detecting the source section of the optical level drop in the optical transmission network, the system operator can make the optical transmission network It has the advantage of providing a stable communication service by allowing the recovery of the source section of the light level of the light level to be rapidly reduced.

However, the method for detecting a light level drop section according to the embodiments of the present invention and the effects that can be achieved by the apparatus are not limited to those mentioned above, and other effects not mentioned above are from the description below. It will be clearly understood by those of ordinary skill in the art.

1 to 3 are diagrams showing a topology structure of an ROADM-based optical transport network related to the present invention;
4 is a view showing the structure of the ROADM equipment related to the present invention;
5 is a view showing the configuration and operation principle of the wavelength selection switch shown in FIG. 4;
6 is a view showing the configuration and operation principle of the wavelength blocker shown in FIG. 4;
7 is a diagram showing the configuration of an apparatus for detecting a light level drop section according to an embodiment of the present invention;
8 is a flowchart illustrating a method for detecting a light level drop section according to an embodiment of the present invention;
9 is a diagram illustrating a criterion for determining whether an ROADM equipment has a failure according to whether a transmission/reception signal is degraded;
10 is a block diagram of a computing device according to an embodiment of the present invention;

Hereinafter, the embodiments disclosed in the present specification will be described in detail with reference to the accompanying drawings, but the same or similar components are assigned the same reference numbers regardless of reference numerals, and redundant description thereof will be omitted. The suffixes "module" and "part" for components used in the following description are given or mixed in consideration of only the ease of writing the specification, and do not have distinct meanings or roles by themselves. That is, the term 'unit' used in the present invention means a hardware component such as software, FPGA, or ASIC, and 'unit' performs certain roles. However, 'part' is not limited to software or hardware. The 'unit' may be configured to reside on an addressable storage medium or it may be configured to refresh one or more processors. Thus, as an example, 'part' refers to components such as software components, object-oriented software components, class components and task components, processes, functions, properties, procedures, subroutines, segments of program code, drivers, firmware, microcode, circuitry, data, databases, data structures, tables, arrays and variables. Functions provided within components and 'units' may be combined into a smaller number of components and 'units' or further divided into additional components and 'units'.

In addition, in describing the embodiments disclosed in the present specification, if it is determined that detailed descriptions of related known technologies may obscure the gist of the embodiments disclosed in this specification, the detailed description thereof will be omitted. In addition, the accompanying drawings are only for easy understanding of the embodiments disclosed in the present specification, and the technical idea disclosed herein is not limited by the accompanying drawings, and all changes included in the spirit and scope of the present invention , should be understood to include equivalents or substitutes.

The present invention is a method for periodically collecting optical signal strength data from a plurality of ROADM devices constituting an optical transmission network, and accurately detecting a source section of an optical level drop in the optical transmission network based on the collected optical signal strength data. and a device thereof. Hereinafter, the source section of the optical level pure drop described in this specification includes not only a plurality of ROADM devices constituting an optical transmission network, but also an optical cable between each ROADM device.

Hereinafter, various embodiments of the present invention will be described in detail with reference to the drawings.

1 to 3 are diagrams illustrating a topology structure of an ROADM-based optical transport network related to the present invention.

First, as shown in FIG. 1 , the optical transmission network 100 may be formed in a point-to-point linear structure. The optical transmission network 100 may include a plurality of nodes 110 connected in a straight line. Here, each node 110 means ROADM equipment.

Each node 110 is connected to the optical fiber 120 , and can perform bidirectional communication through the optical fiber 120 . The optical transmission signal starts from the specific node 110 and proceeds in the right or left direction through the optical fiber 120 . In addition, the optical transmission signal passes through one optical fiber 120 by combining several transmission channels of wavelength units in the WDM method.

Next, as shown in FIG. 2 , the optical transmission network 200 may be formed in a point-to-point ring-type structure. The optical transmission network 200 may include a plurality of nodes 210 connected in a ring shape.

Each node 210 is connected to an optical fiber 220 , and can perform bidirectional communication through the optical fiber 220 . The optical transmission signal starts from a specific node 210 and proceeds in a clockwise or counterclockwise direction through the optical fiber 220 . Similarly, the optical transmission signal passes through one optical fiber 220 by combining several transmission channels of wavelength units in the WDM method.

Finally, as shown in FIG. 3 , the optical transmission network 300 may be formed in a point-to-point mesh structure. The optical transmission network 300 may include a plurality of nodes 310 connected in a mesh shape.

Each node 310 is connected to an optical fiber 320 , and bidirectional communication can be performed through the optical fiber 320 . Each node 310 may be connected to three or more adjacent nodes through an optical fiber 320 , and may process optical signals transmitted/received from the adjacent nodes. Similarly, the optical transmission signal passes through one optical fiber 320 by combining several transmission channels in wavelength units in the WDM method.

4 is a diagram showing the structure of the ROADM equipment related to the present invention, FIG. 5 is a diagram showing the configuration and operation principle of the wavelength selection switch shown in FIG. 4, and FIG. 6 is the configuration of the wavelength breaker shown in FIG. 4 and It is a diagram showing the principle of operation.

4 to 6 , the ROADM equipment 400 related to the present invention includes first and second optical couplers 410 and 410 , a wavelength blocker 430 , and first and second wavelengths. It may include a selection switch (Wavelength Selective Switches 440 and 450), a tunable receiver 460, and a tunable transmitter 470.

The ROADM device 400 may branch a portion of the optical signals to the wavelength blocker 430 through the first optical coupler 410 when optical signals of different wavelengths enter through the optical path, and The remainder may be branched to the first wavelength selection switch 440 .

The first and second wavelength selection switches 440 , 450 , 500 respectively include an input port 510 , a wide area multiplexer 520 , a plurality of optical switches 530 , a plurality of optical couplers 540 , and a plurality of output ports. 550 may be included. Since the first and second wavelength selection switches 440 and 450 are optical devices whose input/output is reversible, an input port can be used as an output port or vice versa.

The wavelength signals received through the input ports 510 of the first wavelength selection switches 440 and 500 are separated into respective wavelength signals through the wide area multiplexer 520 and then input to the plurality of optical switches 530 . In addition, the plurality of optical switches 530 transmit each wavelength signal to a plurality of desired output ports 550 through the plurality of optical couplers 540 . The plurality of output ports 550 transmit the corresponding wavelength signal to the tunable receiver 460 .

The tunable receiver 460 may select and receive any wavelength signal according to an operator's manipulation of the first wavelength selection switch 440 . Meanwhile, the tunable transmitter 470 may add an arbitrary wavelength signal to the second optical coupler 420 through the second wavelength selection switch 450 .

The second optical coupler 420 combines the first wavelength signals passed through the wavelength blocker 430 from the first optical coupler 410 and the second wavelength signals received from the tunable transmitter 470 and outputs them through an optical line. . In this process, since an error occurs when the wavelength of the signal to be added and the wavelength of the pass-through signal match, it is necessary to block the signal passing through. This is performed by the wavelength blocker 430 do.

The wavelength blockers 430 and 600 are optical devices that pass or block a specific wavelength signal. The wavelength blockers 430 and 600 may include an input port 610 , a wide area multiplexer 620 , a plurality of optical switches 630 , an optical coupler 640 , and an output port 650 .

Wavelength signals coming through the input port 610 of the wavelength blockers 430 and 600 are separated for each wavelength by the wide area multiplexer 620 . It is determined whether each wavelength signal is transmitted or blocked by the plurality of optical switches 630 . The transmitted wavelength signals are combined by one optical coupler 640 and then moved to the output port 650 . The output port 650 transmits the corresponding wavelength signals to the second optical coupler 420 .

The ROADM device 400 having such a configuration is a long-distance transmission device unlike other transmission devices. In addition, since the ROADM device 400 transmits the wavelength of light as it is, when an optical signal intensity fluctuation occurs in one device, subsequent devices connected thereto are affected by the optical signal intensity from the preceding device. Therefore, when a failure occurs in a specific section of the optical transmission network, it is necessary to accurately detect the source section of the failure.

Meanwhile, in this embodiment, the Broadcast and Select 　-based ROADM equipment is exemplified to be used in the optical transmission network, but is not limited thereto, and it will be apparent to those skilled in the art that ROADM equipment different from the corresponding equipment may be used.

7 is a diagram illustrating a configuration of an apparatus for detecting a light level drop section according to an embodiment of the present invention.

Referring to FIG. 7 , an apparatus 700 for detecting a light level drop section according to an embodiment of the present invention may include a data collection unit 710 , a failure detection unit 720 , and a failure notification unit 730 . The components shown in FIG. 7 are not essential in implementing the apparatus for detecting a light level drop section, so the light level drop section detection device described herein may have more or fewer components than those listed above. can

The data collection unit 710 may perform a function of collecting optical signal strength data from a plurality of ROADM devices constituting the optical transmission network. In this case, the optical signal strength data includes transmission signal strength data and reception signal strength data of each ROADM device. The transmit signal strength data is data (dBm) measuring the strength of an optical signal transmitted from each ROADM device to an adjacent ROADM device, and the received signal strength data is the strength of an optical signal received from an adjacent ROADM device in each ROADM device. It is measured data.

The data collection unit 710 may collect optical signal strength data regarding a plurality of ROADM devices at a predetermined time period. For example, the data collection unit 710 may collect the optical signal intensity data every 15 minutes, but is not limited thereto.

The optical signal strength data to be collected by the data collection unit 710 is all optical signal strength data measured for a certain time (eg, 15 minutes) in each ROADM device, or the maximum value of the optical signal strength data measured during that time. It may be at least one of a value, a minimum value, and an average value.

The data collection unit 710 may acquire (or collect) information about the components and topology structures of the optical transport network from the network operating system or network management system. This is to identify identification information of the ROADM devices constituting the optical transmission network and a pre/post connection relationship between the ROADM devices.

The failure detection unit 720 may perform a function of detecting a root section of an optical level decrease in the optical transmission network based on optical signal strength data periodically collected from a plurality of ROADM devices.

More specifically, the failure detection unit 720 detects the ROADM equipment in which the light level is reduced based on the collected optical signal intensity data, and backtracks the preceding equipment based on the detected ROADM equipment. It is possible to detect the root section of the light level drop in the optical transmission network. Here, the reason for using the backtracking technique is to assume that failure occurs because all equipments following the specific equipment in which the light level has decreased are all affected by the optical signal strength, and to detect the root failure section of the optical transmission network. This is because it is necessary to inspect the relevant equipment and the preceding equipment to which the previous signal is received.

The failure notification unit 730 may perform a function of providing the system operator with a detection result of whether the optical transmission network has a failure or not and the root period of an optical level decrease of the optical transmission network. In this case, the failure notification unit 730 may output the failure detection result of the optical transmission network to the display unit of the operating system or transmit it to the operator's mobile terminal. In addition, the failure notification unit 730 may provide not only a visual notification signal, but also an audio notification signal and/or a tactile notification signal to the operator.

As described above, the apparatus for detecting an optical level drop section according to an embodiment of the present invention quickly detects a source section of an optical level drop in an optical transmission network based on optical signal strength data periodically collected from a plurality of ROADM devices. can be accurately detected. Accordingly, the system operator is able to quickly recover the root section of the light level drop in the ROADM-based optical transmission network. This is different from the fact that more than a dozen people are put in to determine and repair the failure of the existing ROADM equipment and the personnel analyzed all the ROADM sections for more than an hour. Therefore, faster and safer communication service can be provided, and more stable communication service quality can be provided, especially to customers who are very sensitive to specific instantaneous sections such as the financial sector.

8 is a flowchart illustrating a method for detecting a light level drop section according to an embodiment of the present invention.

Referring to FIG. 8 , an apparatus 700 for detecting an optical level drop section according to the present invention obtains information about the components and topological structure of an optical transport network from a network operating system or a network management system, and stores the acquired information in a memory ( not shown) (S805).

The optical level drop detection apparatus 700 may periodically collect optical signal strength data from a plurality of ROADM devices constituting the optical transmission network ( S810 ). In this case, the optical signal strength data includes transmission signal strength data and reception signal strength data of each ROADM device. In addition, the optical signal strength data is data on the optical signal strength measured by each ROADM device, and may be at least one of an actual value, a maximum value, a minimum value, and an average value.

The optical level drop detection apparatus 700 may check whether a simple optical level drop occurs in the optical transmission network based on optical signal intensity data collected from a plurality of ROADM devices (S815). That is, the light level drop detection apparatus 700 may check whether the intensity of the optical signals collected from the plurality of ROADM devices rises above the first predetermined threshold or decreases below the second predetermined threshold. .

As a result of the check in step 815, when an optical level decrease occurs in the optical transmission network, the optical level decrease section detection apparatus 700 may detect the ROADM equipment in which the corresponding optical level decrease occurs first (S820). The optical level reduction section detection apparatus 700 may determine the order in which the corresponding ROADM equipment is disposed in the overall topology structure of the optical transmission network based on the detected identification information of the ROADM equipment. Hereinafter, in this embodiment, for convenience of description, the corresponding ROADM device will be referred to as the N-th ROADM device.

The optical level drop detection apparatus 700 may determine whether the corresponding equipment has a failure based on the optical signal strength data collected from the N-th ROADM equipment, that is, the transmitted signal strength data and the received signal strength data. For example, as shown in FIG. 9 , when an optical level drop does not occur in the reception signal strength data and the transmission signal strength data of the N-th ROADM device, the optical level decrease section detection device 700 normalizes the ROADM device. state can be judged. On the other hand, when the light level drop does not occur in the received signal strength data of the Nth ROADM equipment and the light level drop occurs only in the transmit signal strength data, the light level drop section detection device 700 disables the corresponding ROADM equipment. state can be judged. On the other hand, when an optical level drop occurs in the reception signal strength data and the transmission signal strength data of the Nth ROADM device, the optical level decrease section detection apparatus 700 determines that the equipment preceding the corresponding ROADM device has a failure. can

The apparatus 700 for detecting an optical level drop section may check whether a simple drop in the optical level occurs in the received signal intensity data among the optical signal intensity data collected from the Nth ROADM device (S825).

As a result of the check in step 825, if the optical level drop does not occur in the received signal strength data of the Nth ROADM device, the optical level drop detection device 700 transmits the optical signal strength data collected from the Nth ROADM device. It can be checked whether a light level drop occurs in the signal intensity data (S830).

As a result of the check in step 830, when a light level drop occurs in the transmitted signal strength data of the N-th ROADM device, the light level drop detection device 700 determines that a failure (or failure) has occurred in the N-th ROADM device It can be done (S835).

On the other hand, as a result of the confirmation in step 830, when the light level drop does not occur in the transmitted signal strength data of the N-th ROADM device, the light level drop section detection device 700 is the N+1-th disposed behind the corresponding ROADM device. It can be checked whether a light level drop occurs in the ROADM equipment (S840).

As a result of the check in step 840, when an optical level decrease occurs in the N+1th ROADM device, the optical level decrease section detection apparatus 700 may determine that the Nth ROADM device is in a normal state (S845).

On the other hand, as a result of the check in step 840, when the light level drop does not occur in the N+1th ROADM device, the optical level drop section detection apparatus 700 detects the light between the Nth ROADM device and the N+1th ROADM device. It can be determined that a failure has occurred in the cable (S850).

On the other hand, as a result of the above-described step 825, when an optical level drop occurs in the received signal strength data of the N-th ROADM device, the optical level drop section detection apparatus 700 performs the N-1th ROADM preceding the corresponding ROADM device. It is possible to detect equipment and determine whether there is a failure with respect to the detected N-1 th ROADM equipment (S855). That is, the light level drop detection apparatus 700 may repeatedly perform steps 820 to 850 described above for the N-1 th ROADM device. This process can be repeated until the source section causing the light level drop in the optical transmission network is detected while sequentially backtracking the preceding devices.

As described above, the method for detecting the optical level drop section according to the present invention detects the source section of the optical level drop of the corresponding optical transmission network based on the optical signal strength data periodically collected from a plurality of ROADM devices constituting the optical transmission network. can be detected quickly and accurately.

10 is a block diagram of a computing device according to an embodiment of the present invention.

Referring to FIG. 10 , the computing device 1000 according to an embodiment of the present invention includes at least one processor 1010 , a computer-readable storage medium 1020 , and a communication bus 1030 . The computing device 1000 may be one or more components included in the above-described light level drop section detection apparatus 700 or elements 710 to 730 constituting the light level drop section detection device 700 .

The processor 1010 may cause the computing device 1000 to operate according to the aforementioned exemplary embodiment. For example, the processor 1010 may execute one or more programs 1025 stored in the computer-readable storage medium 1020 . The one or more programs may include one or more computer-executable instructions, which when executed by the processor 1010 configure the computing device 1000 to perform operations according to the exemplary embodiment. can be

Computer-readable storage medium 1020 is configured to store computer-executable instructions or program code, program data, and/or other suitable form of information. The program 1025 stored in the computer-readable storage medium 1020 includes a set of instructions executable by the processor 1010 . In one embodiment, computer-readable storage medium 1020 includes memory (volatile memory, such as random access memory, non-volatile memory, or a suitable combination thereof), one or more magnetic disk storage devices, optical disk storage devices, flash It may be memory devices, other types of storage media accessed by the computing device 1000 and capable of storing desired information, or a suitable combination thereof.

Communication bus 1030 interconnects various other components of computing device 1000 , including processor 1010 and computer-readable storage medium 1020 .

Computing device 1000 may also include one or more input/output interfaces 1040 and one or more network communication interfaces 1060 that provide interfaces for one or more input/output devices 1050 . The input/output interface 1040 and the network communication interface 1060 are connected to the communication bus 1030 .

The input/output device 1050 may be connected to other components of the computing device 1000 through the input/output interface 1040 . Exemplary input/output device 1050 may include a pointing device (such as a mouse or trackpad), a keyboard, a touch input device (such as a touchpad or touchscreen), a voice or sound input device, various types of sensor devices, and/or photographing devices. input devices and/or output devices such as display devices, printers, speakers and/or network cards. The exemplary input/output device 1050 may be included in the computing device 1000 as a component constituting the computing device 1000 , and may be connected to the computing device 1000 as a separate device distinct from the computing device 1000 . may be

The present invention described above can be implemented as computer-readable codes on a medium in which a program is recorded. The computer-readable medium includes all types of recording devices in which data readable by a computer system is stored. Examples of computer-readable media include Hard Disk Drive (HDD), Solid State Disk (SSD), Silicon Disk Drive (SDD), ROM, RAM, CD-ROM, magnetic tape, floppy disk, optical data storage device, etc. There is this. Accordingly, the above detailed description should not be construed as restrictive in all respects but as exemplary. The scope of the present invention should be determined by a reasonable interpretation of the appended claims, and all modifications within the equivalent scope of the present invention are included in the scope of the present invention.

700: light level lowering section detection device 710: data collection unit
720: failure detection unit 730: failure notification unit

Claims (9)

A method for detecting a failure section in an optical transmission network based on Reconfigurable Optical Add/Drop Multiplexer (ROADM),
obtaining information about the optical transport network from a network operating system;
collecting optical signal strength data from a plurality of ROADM devices constituting the optical transmission network;
detecting a source section that causes an optical level drop of the optical transmission network based on the obtained information on the optical transmission network and the collected optical signal strength data; and
The method of detecting a failure section in an ROADM-based optical transmission network, comprising the step of providing information on a root section of the detected light level drop to a system operator. According to claim 1,
The method for detecting a failure section in an ROADM-based optical transport network, wherein the information on the optical transport network includes information on components and topological structures of the optical transport network. According to claim 1,
The optical signal strength data, the method for detecting a failure section in an ROADM-based optical transmission network, characterized in that it includes the transmission signal strength data and the reception signal strength data of each ROADM equipment. According to claim 1,
The optical signal strength data is a method for detecting a failure section in an ROADM-based optical transmission network, characterized in that periodically collected from the plurality of ROADM devices. The method of claim 1, wherein the detecting step comprises:
detecting ROADM equipment in which the optical level is reduced in the optical transmission network; and
The method for detecting a failure section in an ROADM-based optical transmission network, further comprising the step of determining whether the corresponding equipment has a failure based on the optical signal strength data collected from the detected ROADM equipment. The method of claim 5, wherein the step of determining whether there is a failure,
determining that the detected ROADM equipment is in a normal state when the light level does not decrease in the received signal strength data and the transmitted signal strength data of the detected ROADM equipment; and
When the light level drop does not occur in the received signal strength data of the detected ROADM equipment, and the light level drop occurs in the transmit signal strength data of the equipment, determining the detected ROADM equipment as a failure state A method for detecting a failure section in an ROADM-based optical transmission network, characterized in that it further comprises. The method of claim 5, wherein the detecting step comprises:
detecting an ROADM device preceding the corresponding ROADM device when a light level drop occurs in the received signal strength data of the detected ROADM device; and
The method for detecting a failure section in an ROADM-based optical transmission network, characterized in that the method further comprises the step of determining whether the corresponding preceding equipment has a failure based on the optical signal strength data collected from the detected preceding ROADM equipment. A computer program stored in a computer-readable recording medium so that the method according to any one of claims 1 to 7 can be executed on a computer. In an apparatus for detecting a failure section in an optical transmission network based on Reconfigurable Optical Add/Drop Multiplexer (ROADM),
a data collection unit that obtains information on the optical transport network from a network operating system and collects optical signal strength data from a plurality of ROADM devices constituting the optical transport network;
a failure detection unit configured to detect a root section causing an optical level drop of the optical transmission network based on the obtained information on the optical transmission network and the collected optical signal strength data; and
An apparatus for detecting a failure section in an ROADM-based optical transmission network, comprising a failure notification unit for providing information on a root section of the detected optical level drop to a system operator.

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