KR102073334B1 - System and method for confirm network connection - Google Patents

Abstract

Network configuration confirmation system according to an embodiment of the present invention, a network comprising a passive remote node and an optical fiber, connected to one end of the optical fiber of the network, to scan a laser to the optical fiber, from the optical fiber And a passive remote node, one end of which is connected to the front end of the passive remote node and the other end of which is connected to the optical fiber constituting the network. And an optical pulse generation and injection unit for generating optical pulses and injecting optical pulses into the optical fibers constituting the network, and the optical signal reflected from the optical fibers constituting the network. To include an optical signal receiver for receiving, the optical signal analyzer for analyzing the received optical signal to be configured There.

Description

SYSTEM AND METHOD FOR CONFIRM NETWORK CONNECTION}

The present invention relates to a method and system for verifying node configuration and connectivity of a network based on an optical signal.

In order to provide optical communication to optical subscribers, a central base station inserts a remote node for branching and combining communication signals to a plurality of subscribers, and distributes and transmits optical communication to subscribers in the remote node.

In the past, active devices have been used in such remote nodes, allowing devices to directly transmit their location and type to a central base station.

On the other hand, in recent years, since the remote node is often configured as a passive element, since the position and type of the remote node can not be transmitted directly from the passive element of the remote node to the central base station, An unknown problem exists.

On the other hand, in order to solve such a problem, conventionally, by applying a separate power supply to the passive element of the remote node and inserting an active element capable of communicating with the central base station, information such as the position and the type of the element constituting the node The remote node is identified by the transmission method to the central base station.

However, this problem solving method is inconvenient to additionally need a separate device for converting the passive device to the active device.

The present invention provides a method and system that can determine the location and type of a passive remote node by analyzing the network constituting the passive remote node as it is.

According to an embodiment of the present invention, a method for confirming a network configuration including a passive remote node includes: an optical pulse injection step of injecting an optical pulse into an optical fiber constituting the network, and receiving an optical signal reflected and returned through the optical fiber And an optical signal analyzing step of analyzing the received optical signal, wherein the optical signal analyzing step is based on the waveform of the received optical signal, and the position of the passive remote node constituting the network; You can check the type.

In the optical signal analyzing step, when the intensity of the received optical signal is attenuated with a constant slope, it is determined that there is no passive connector and a connection portion in the network, and the intensity of the optical signal is attenuated with a constant slope, When a peak waveform occurs, it is determined that a connection portion using a connector exists, and when the constant slope falls vertically after the constant slope falls vertically and then attenuates with the constant slope, a point where the constant slope falls vertically It can be determined that a fusion splicing point exists at.

In the optical signal analyzing step, if there is an area of a stepped waveform that exists outside the constant slope after taking the constant slope, it is determined that a passive remote node including a gainer exists in an area where the stepped wave exists. can do.

On the other hand, the area of the staircase waveform has a predetermined reflection gain (gain) value according to the difference between the MFD (Mode-Field Diameter) of the gainer and the MFD value of the general optical fiber inserted in the front and rear or middle of the passive remote node, The length of the step waveform present outside the constant slope may be present in proportion to the length of the gayner.

The optical signal analyzing may include classifying passive remote nodes according to any one of the predetermined gain value or the length of the staircase waveform that exists beyond a certain slope, or code according to a combination of a unit length gayer. You can identify the type of passive remote node by creating.

Network configuration confirmation system according to an embodiment of the present invention is connected to a network consisting of a passive remote node and an optical fiber, one end of the optical fiber of the network, to scan a laser to the optical fiber, and to return from the optical fiber It includes an optical time domain reflectometer (OTDR) for analyzing the incoming optical signal to confirm the network configuration, the passive remote node is configured to include a gater inserted in front or rear end of the passive remote node OTDR A signal and a communication optical signal are all configured to pass through the gater, and the OTDR is reflected from an optical pulse generation and injection unit for generating an optical pulse and injecting an optical pulse into an optical fiber constituting the network, and an optical fiber constituting the network. Optical signal receiving unit for receiving the returned optical signal, Optical signal for analyzing the received optical signal It may be configured to include a call analysis unit.

Network configuration confirmation system according to another embodiment of the present invention, a network comprising a passive remote node and an optical fiber, connected to one end of the optical fiber of the network, to scan a laser into the optical fiber, the optical fiber And a passive remote node, comprising a wavelength separation filter for separating a communication optical signal and the OTDR laser wavelength, wherein the passive remote node is configured to analyze the optical signal from the optical signal. A gater connected to one end of the gater, one end of which is connected to the gater, and the other end of which comprises a wavelength coupling filter connected to a rear end of the passive remote node, wherein the OTDR generates an optical pulse to form a network. An optical pulse generation and injection unit for injecting optical pulses into an optical fiber, the optical fiber constituting the network Is used can comprise an optical signal receiving unit, an optical signal analysis that analyzes the received optical signal to an optical signal received return portion.

The gainer may have an MFD value different from that of the mode-field diameter (MFD) of the optical fiber constituting the network.

When the intensity of the received optical signal is attenuated with a constant slope, the optical signal analyzer determines that there is no passive remote node and a connection portion in the network, and the intensity of the optical signal is attenuated with a constant slope, When a peak waveform occurs, it is determined that a connection portion using a connector exists, and when the constant slope falls vertically after the constant slope falls vertically and then attenuates with the constant slope, a point where the constant slope falls vertically It can be determined that a fusion splicing point exists at.

The optical signal analyzer may determine that a passive remote node including a gainer exists in an area where the stepped waveform exists when there is an area of the stepped waveform present outside the predetermined slope.

The area of the staircase waveform has a predetermined reflection gain value according to a difference between a mode-field diameter (MFD) of a gayner inserted in front and rear or middle of the passive remote node and an MFD value of a general optical fiber, The length of the staircase waveform that exists beyond a certain slope may be present in proportion to the length of the gayner.

On the other hand, the type of passive remote node is distinguished according to any one of the predetermined gain value or the length of the staircase waveform existing outside a predetermined slope, or the code is generated according to a combination of the length of the unit of the passive. Different types of nodes can be distinguished.

According to an embodiment of the present invention, a network system includes a central base station, at least one passive remote node, a subscriber connected to the passive remote node, at least one passive remote node and the central base station, and between the passive remote node and the subscriber. It may comprise a connecting optical fiber.

The passive remote node may further comprise a gainer capable of identifying the passive remote node.

Passive device according to an embodiment of the present invention, one end is connected to the central base station, the other end is connected to the subscriber to distribute the optical signal of the central base station to the subscriber, the passive device is to identify the passive device It may be configured to include a gainer.

The present invention can detect the location and type of the passive remote node through optical signal analysis of the network.

1 is a flowchart illustrating a network configuration checking method according to an embodiment of the present invention.
2 is a block diagram of an optical fiber constituting a network according to an embodiment of the present invention.
3 is a graph showing the intensity of the optical signal generated according to the MFD difference.
4 is a block diagram of a network configuration checking system according to an embodiment of the present invention.
5 is a graph showing a gayer and an optical signal strength according to an embodiment of the present invention.
6 is a block diagram of a network configuration checking system according to another embodiment of the present invention.

DETAILED DESCRIPTION Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art may easily implement the present invention. As those skilled in the art would realize, the described embodiments may be modified in various different ways, all without departing from the spirit or scope of the present invention. In the drawings, parts irrelevant to the description are omitted for simplicity of explanation, and like reference numerals designate like parts throughout the specification.

Terms including ordinal numbers such as first and second may be used to describe various components, but the components are not limited by the terms. The first component may be referred to as a second component without departing from the scope of the rights. The terms are used only for the purpose of distinguishing one component from another. For example, in the present invention, similarly, the second component may also be referred to as the first component. The terminology used herein is for the purpose of describing particular example embodiments only and is not intended to be limiting of the invention. Singular expressions include plural expressions unless the context clearly indicates otherwise.

Throughout the specification, when a part is “connected” to another part, it is not only “directly connected” but also “electrically or optically connected” with another element in between. Include. In addition, when a part is said to "include" a certain component, it means that it may further include other components, except to exclude other components unless otherwise stated. As used throughout this specification, the term “step of” or “step of” does not mean “step for”.

The terms used in the present invention have been selected as widely used general terms as possible in consideration of the functions in the present invention, but this may vary according to the intention or precedent of the person skilled in the art, the emergence of new technologies, and the like. In addition, in certain cases, there is a term arbitrarily selected by the applicant, and in this case, the meaning will be described in detail in the description of the invention. Therefore, the terms used in the present invention should be defined based on the meanings of the terms and the general contents of the present invention, rather than simply the names of the terms.

1. Passive device according to an embodiment of the present invention

Passive device according to an embodiment of the present invention, one end is connected to the central base station, the other end is connected to the subscriber can distribute the optical signal of the central base station to the subscriber.

More specifically, the passive device may further include a gainer capable of identifying the passive device.

On the other hand, the gayer may perform the same configuration and function as the gayer, such as the network configuration confirmation method and the network configuration confirmation system according to an embodiment of the present invention to be described later.

2. Network system according to an embodiment of the present invention

Network system according to an embodiment of the present invention, a central base station, at least one passive remote node, a subscriber connected to the passive remote node, between the at least one passive remote node and the central base station and between the passive remote node and the subscriber It may comprise a connecting optical fiber.

Meanwhile, the passive remote node may further include a gainer that can identify the passive remote node.

On the other hand, the gayer may perform the same configuration and function as the gayer, such as the network configuration confirmation method and the network configuration confirmation system according to an embodiment of the present invention to be described later.

3. Method of confirming network configuration according to an embodiment of the present invention.

1 is a flowchart illustrating a network configuration checking method according to an embodiment of the present invention.

Hereinafter, a method for confirming network configuration according to an embodiment of the present invention will be described with reference to FIG. 1.

In the network configuration confirmation method according to an embodiment of the present invention, by applying a pulse to the laser of the OTDR, the optical pulse injection step (S100) for injecting an optical pulse to the optical fiber constituting the network, the optical signal reflected back from the optical fiber It may be configured to include an optical signal receiving step (S200) for receiving, the optical signal analysis step (S300) for analyzing the received optical signal.

On the other hand, OTDR used throughout the present specification is an abbreviation of OPTICAL TIME DOMAIN REFLECTOMETER means a measuring instrument that can measure the presence or absence of abnormality, such as damage to the optical communication network.

More specifically, the optical pulse injection step (S100), by connecting a laser generator to one end of the optical fiber constituting the network can inject the laser into the optical fiber constituting the network.

On the other hand, the optical signal receiving step (S200), the optical signal returned through the optical fiber through a directional coupler, can be received by a photodiode, it can remove the noise through averaging.

On the other hand, the optical signal analysis step (S300), it is possible to confirm the configuration of the network by analyzing the intensity (waveform) of the received optical signal.

More specifically, the optical signal analysis step (S300), when the intensity of the received optical signal is attenuated with a constant slope, it is determined that there is no passive connector and the connection portion in the network, the slope of the intensity of the optical signal is constant When a peak waveform is generated and attenuates, it is determined that a connection part using a connector exists. When the constant slope falls vertically after the constant slope falls vertically, the attenuation is attenuated with the constant slope. It can be determined that the fusion splicing point exists at the point where the constant slope falls vertically.

When there is an area of the stepped waveform that exists outside the predetermined slope, it may be determined that a passive remote node including a gainer exists in the area where the stepped waveform exists.

Hereinafter, the basis of determination of the optical signal analysis step will be described with reference to FIGS. 2 and 3.

2 is a view showing a general optical fiber. Referring to FIG. 2, a general optical fiber may be composed of a core and cladding having different refractive indices. In the optical fiber configured as described above, the size of a region where most light is distributed may be defined as a mode-field diameter (MFD).

Such MFD may generally vary depending on the size and wavelength of the core, and may be formed larger than the size of the core.

Meanwhile, when the MFD is defined as described above, the reflected optical signal intensity P (z) according to the distance may be calculated by Equation 1 below through the pulse power, wavelength, distance, and attenuation coefficient of the optical fiber of the laser light source. .

On the other hand, the intensity of the optical signal can be attenuated away from the OTDR to be measured.

On the other hand, Figure 3 is a graph showing the optical signal strength when the MFD is connected to the same optical fiber and when the MFD is connected to two different optical fibers.

First, when the MFD connects two optical fibers in the same fusion splicing manner, only the contact loss occurs as the two optical fibers are directly connected.

On the other hand, when the MFD connects two identical optical fibers through the connector, more optical signal reflection may occur in the connector, such that an optical signal in the form of one peak waveform may appear.

Next, when MFDs connect two different optical fibers, a predetermined gain is generated by the MFD difference between the two optical fibers.

For example, when a laser is injected into an optical fiber having a small MFD in an optical fiber having a large MFD, the optical signal may increase in magnitude since the optical signal is inversely proportional to the square of the MFD, and vice versa. When a laser is injected into a large optical fiber, the optical signal can be reduced because it is inversely proportional to the square of the MFD.

On the other hand, the optical signal has a predetermined gain value according to the difference between the mode-field diameter (MFD) of the gainer connected to the front end of the passive remote node and the mode-field diameter (MFD) of the optical fiber of the network. The length of the step waveform present outside the constant slope may be proportional to the length of the gainer.

Based on the above description, the optical signal analyzing step includes determining the type of the passive remote node according to any one of a unique gain value of the optical signal or a length of a stepped waveform existing outside a predetermined slope. Codes can be generated according to the combination of the length of the unit or the gayner of the unit length to distinguish the types of passive remote nodes.

For example, for each type of passive remote node, the length of the staircase waveform that exists outside the gain value or the constant slope is matched and stored as a table as shown in Tables 1 and 2 below, or according to the combination of the unit lengths of the gayner as shown in Table 3 below. You can generate code to determine the type of passive remote node.

Gain value 2 3 4 Remote node type A B C

The length of the staircase waveform outside of a constant slope 100 110 120 Remote node type A B C

Combination Remote node type 100 Gayer + Normal Fiber + Normal Fiber Cord: [100] A 100 Gainers + 100 Gainers + Normal Fiber Optic Cord: [110] B 100 Gainer + Normal Fiber + 100 Gainer Code: [101] C 100 Gainer + 100 Gainer + 100 Gainer Code: [111] D

4. Network configuration verification system according to an embodiment of the present invention.

4 is a block diagram of a network configuration checking system according to an embodiment of the present invention.

Hereinafter, a network configuration verification system according to an embodiment of the present invention will be described with reference to FIG. 4.

Network configuration confirmation system according to an embodiment of the present invention, the network 10 including the passive remote node 120 and the optical fiber 110 and one end is connected to one end of the optical fiber 110 of the network, The optical fiber 110 may be configured to include an OTDR 20 that scans a laser and analyzes an optical signal returned from the optical fiber 110 to confirm a network configuration.

More specifically, the passive remote node 120, one end is connected to the front end of the passive remote node 120, the other end is a gainer (gainer) connected to the optical fiber 110 constituting the network 10 It may be configured to further include (121).

Meanwhile, the gayner 121 may have a MFD value different from that of the mode-field diameter (MFD) of the optical fiber 110 constituting the network 10.

On the other hand, the OTDR 20, the optical pulse generation and injection unit for generating an optical pulse to inject the optical pulse to the optical fiber 110 constituting the network, and receives the optical signal reflected back from the optical fiber constituting the network The optical signal receiver may be configured to include an optical signal analyzer configured to analyze the received optical signal.

Meanwhile, when the intensity of the received optical signal is attenuated with a constant slope, the optical signal analyzer determines that there is no passive connector and a connection portion in the network, and the intensity of the optical signal is attenuated with a constant slope, When the peak waveform of the power source is generated, it is determined that there is a connection portion using the connector. When the constant slope falls vertically after taking the constant slope, the constant slope falls vertically when attenuating with the constant slope. It can be determined that a fusion splicing point exists at the point.

In addition, when there is an area of the stepped waveform present outside the constant slope, it may be determined that the passive remote node 120 including the gainer 121 exists in the area in which the stepped waveform exists.

For example, when the optical signal analyzer has an MFD value different from that of the MFD of the optical fiber 110 constituting the network, the optical signal intensity analyzed by the OTDR is inversely proportional to the square of the MFD as shown in FIG. 5. In the graph, a stepped waveform present outside the constant slope may appear.

The attenuation region of the staircase waveform existing outside the constant slope includes a mode-field diameter (MFD) of a gainer 121 connected to a front end of the passive remote node 120 and an MFD (mode-) of the optical fiber 110. The interval of the stepped waveform having a predetermined gain value according to a field diameter) difference and existing outside the predetermined slope may be proportional to the length of the gainer 121.

The optical signal analyzer may distinguish the type of the passive remote node 120 according to any one of the gain value and the length of the gainer 121, or according to the combination of the gainer 121 having a unit length. A code may be generated to distinguish the type of the passive remote node 120.

Meanwhile, a specific embodiment for classifying the type of the passive remote node 120 may be the same as an example for classifying the type of the passive remote node in the network configuration method according to the embodiment of the present invention described above.

5. Network configuration verification system according to another embodiment of the present invention

6 is a block diagram of a network configuration checking system according to another embodiment of the present invention.

Network configuration confirmation system according to another embodiment of the present invention is a network 10, including a passive remote node 130 and the optical fiber 110, connected to one end of the optical fiber 110 of the network 10 And an OTDR 20 that scans a laser beam into the optical fiber 110 and analyzes the optical signal returned from the optical fiber 110 to confirm the network 10 configuration.

More specifically, the passive remote node 130, one end is connected to the front end of the passive remote node 130, the other end is connected to the optical fiber 110 constituting the network to the optical fiber of the network A wavelength separation filter 132 for separating the scanned laser wavelengths, a gainer 133 connected to one end of the wavelength separation filter 132, one end connected to the gayer 133, and the other end of the passive remote And a wavelength combining filter 134 connected to the rear end of the node 131.

As such, the gater 133 may not be directly connected to the optical fiber 110 constituting the network 10, but may be configured in a bypass form using the wavelength separation filter 132 and the wavelength coupling filter 134. In this case, the contact loss generated when the optical fiber 110 and the gayer 133 of the network are connected may be prevented to calculate a more accurate gain value.

On the other hand, since the OTDR 20 of the network configuration confirmation system according to another embodiment of the present invention is the same as the configuration and function of the OTDR 20 of the network configuration confirmation system according to an embodiment of the present invention described in detail Omit it.

On the other hand, although the technical spirit of the present invention has been described in detail according to the above embodiment, it should be noted that the above embodiment is for the purpose of description and not for the limitation. In addition, those skilled in the art will understand that various embodiments are possible within the scope of the technical idea of the present invention.

10: network
20: OTDR
110: optical fiber
120, 130: Passive Remote Node
121, 133: Gayner
132 wavelength separation filter
134: Wavelength Coupled Filter

Claims (12)

A method for checking a network configuration comprising a passive remote node and a gainer connected to the front end of the passive remote node and having a predetermined MFD value different from the MFD value of the optical fiber constituting the network,
An optical pulse injection step of injecting an optical pulse into an optical fiber constituting the network;
A reflection light signal receiving step of receiving a reflection light signal in which the light pulse injected into the optical fiber is reflected and returned in the light pulse injection step;
A reflected light signal analyzing step of analyzing the received reflected light signal;
It is configured to include,
The reflected optical signal analysis step,
Detecting a stepped waveform deviating from a predetermined slope in the waveform of the reflected light signal according to the gayner or the combination of the gayner,
By matching the detected gain value of the stepped waveform and the length of the stepped waveform to a pre-stored remote node type relationship table,
By generating an identification code according to a combination of a gayer or a gayer, the type of passive remote node constituting the network is identified.
The gain value of the step waveform is
It is determined by the difference between the Mode-Field Diameter (MFD) value of the Gainer connected to the front end of the passive remote node and the MFD (Mode-Field Diameter) value of the optical fiber constituting the network.
The length of the step waveform,
Method of verifying the configuration of a passive optical network including a gayer, characterized in that proportional to the length of the gainer (Gainer).
delete delete delete A network comprising a passive remote node and an optical fiber;
An OTDR connected to one end of an optical fiber of the network and analyzing a reflected optical signal of a laser scanned on the optical fiber to confirm a network configuration;
In the network configuration confirmation system configured to include,
The passive remote node is connected at one end to the front end of the passive remote node, and the other end is connected to the optical fiber constituting the network, and has a predetermined MFD value different from the MFD value of the optical fiber constituting the network. Branches are configured to include the Gainer,
The OTDR is,
An optical pulse generation and injection unit for generating optical pulses and injecting optical pulses into an optical fiber constituting a network;
A reflected light signal receiver configured to receive a reflected light signal on which the optical signal scanned by the optical fiber constituting the network is reflected and returned;
A reflected light signal analyzer configured to analyze the received reflected light signal;
It is configured to include,
Detecting a stepped waveform deviating from a predetermined slope in the waveform of the reflected light signal according to the gayner or the combination of the gayner,
By matching the detected gain value of the stepped waveform and the length of the stepped waveform to a pre-stored remote node type relationship table,
By generating an identification code according to a combination of a gayer or a gayer, the type of passive remote node constituting the network is identified.
The gain value of the staircase waveform is determined by a difference between a mode-field diameter (MFD) value of a gainer connected to a front end of the passive remote node and a mode-field diameter (MFD) value of an optical fiber constituting a network. ,
And a length of the staircase waveform is proportional to a length of the gainer.
A network comprising a passive remote node and an optical fiber;
An OTDR connected to one end of an optical fiber of the network and analyzing a reflected optical signal of a laser scanned on the optical fiber to confirm a network configuration;
In the network configuration confirmation system configured to include,
The passive remote node,
A wavelength separation filter connected to the front end of the passive remote node to separate laser wavelengths scanned on optical fibers of the network;
A gainer connected to an output terminal of the wavelength separation filter and having a MFD value different from an MFD value of an optical fiber constituting the network;
A wavelength coupling filter having one end connected to a rear end of the passive remote node and a rear end of the gainer;
It is configured to include,
The OTDR is,
An optical pulse generation and injection unit for generating optical pulses and injecting optical pulses into an optical fiber constituting a network;
A reflected light signal receiver configured to receive a reflected light signal on which the optical signal scanned by the optical fiber constituting the network is reflected and returned;
A reflected light signal analyzer configured to analyze the received reflected light signal;
It is configured to include,
Detecting a stepped waveform deviating from a predetermined slope in the waveform of the reflected light signal according to the gayner or the combination of the gayner,
By matching the detected gain value of the staircase waveform and the length of the staircase waveform to a pre-stored remote node type relationship table, an identification code according to a combination of a gayer or a gainer is generated to identify the types of passive remote nodes constituting the network. ,
The gain value of the staircase waveform is determined by a difference between a mode-field diameter (MFD) value of a gainer connected to a front end of the passive remote node and a mode-field diameter (MFD) value of an optical fiber constituting a network. ,
And a length of the staircase waveform is proportional to a length of the gainer.
delete delete delete delete Central base station;
One or more passive remote nodes;
A subscriber connected to the passive remote node;
An optical fiber connecting between the one or more passive remote nodes and the central base station and between the passive remote node and a subscriber;
It is configured to include,
The passive remote node,
It further comprises a gainer (gainer) having a MFD value different from the MFD value of the optical fiber,
The central base station,
Detecting a stepped waveform deviating from a predetermined slope in a waveform of a reflected light signal formed according to the gayner or the combination of the gayner included in the passive remote node,
By matching the detected gain value of the staircase waveform and the length of the staircase waveform to a pre-stored remote node type relationship table, an identification code according to a combination of a gayer or a gainer is generated to identify the types of passive remote nodes constituting the network. ,
The gain value of the staircase waveform is determined by a difference between a mode-field diameter (MFD) value of a gainer connected to a front end of the passive remote node and a mode-field diameter (MFD) value of an optical fiber constituting a network. ,
The length of the staircase waveform, the network system including a gayer, characterized in that proportional to the length of the gainer (Gainer).
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