KR101169404B1 - Apparatus and Method for detecting an ONTOptical Network Terminal of FTTH - Google Patents

Abstract

An apparatus and method for detecting an optical termination device of an optical communication network, which detects whether an optical termination device is connected by using reflection characteristics of an optical termination device having different degrees of reflection of light applied to the optical cable according to termination characteristics of the optical cable. An apparatus for detecting an optical termination device of an optical communication network, comprising: an optical output unit configured to output a first optical signal and a second optical signal having different wavelengths; An optical receiver configured to receive a first reflection signal corresponding to the first optical signal and a second reflection signal corresponding to the second optical signal; A determination unit determining a connection state of the optical termination device based on the first reflection signal and the second reflection signal received through the light reception unit; And a control unit for controlling the optical output unit, the light receiving unit and the determination unit to determine the connection state of the optical termination device.

Description

Apparatus and Method for detecting an ONT (Optical Network Terminal) of FTTH}

The present invention relates to an apparatus and method for detecting an optical termination device installed at an end of an optical communication network, and more particularly, to an optical termination device detection apparatus for an optical communication network detecting an optical termination device connected to the optical communication network even when the power is turned off. And to a method.

FTTH (Fiber to the home), which is a kind of optical communication network, assumes optical cable, unlike high-speed Internet of general optical communication system connecting optical fiber only to an external point and other methods such as LAN line or coaxial cable in house. By connecting up to 100 times faster than the existing ADSL can provide a stable quality service. In this case, FTTH is also called FTTP (Fiber to the premises).

1 is a diagram illustrating a basic connection structure of an FTTH optical network. As shown in FIG. 1, an FTTH optical network has a plurality of optical line terminals (OLTs) connected to a plurality of optical relay devices (RNs) and optical cables in order to supply optical communication services from service providers. )), Which is installed in a telephone pole of a service providing area, etc., is composed of an optical line device, an optical network terminal (ONT (Optocal Network Terminal)), an optical relay device connected by an optical cable, and an optical terminal device located in a user's home. Here, the optical relay device is a splitter and distributes an optical signal to or from the optical line device and is connected to the optical termination device corresponding to the end user. The optical termination device is simply a user's optical modem.

In the FTTH optical network, it is important to check whether there is a real user (that is, an optical termination device) at the end of the network when managing the network. Unnecessary cables can be detected and services can be efficiently delivered to additional subscribers. However, since the termination of the optical communication network is mostly in the home, it is difficult to visit and check it. In particular, when the power of the optical termination device is turned off, it is difficult to identify the communication through the optical cable. Therefore, even if the power is off, there is a need for a method that can determine the existence of the optical termination device in the home.

Conventionally, an optical fiber identifier or the like is used to determine the presence or absence of ONT. That is, when the power of the optical termination device is turned on, communication between the optical termination device and the optical line device is performed, so that it is possible to check whether the optical termination device is connected by using an optical fiber identifier.

However, in the conventional method of determining the presence or absence of the optical termination device using an optical fiber collimator, there is a problem that the optical termination device cannot be used when the power of the optical termination device is turned off. That is, in the case of using the optical fiber collimator or the like, when the power of the optical terminator is turned off, communication between the optical terminator and the optical line apparatus does not occur, so that the user can determine that the user does not have the optical terminator. have. Then, when the power is turned off to determine that the user does not have the optical end device, there is a problem that the existing user can not use the normal optical network service when removing the optical cable or connected to another user.

The present invention has been proposed in view of the above-described conventional problems, and an object thereof is the presence or absence of connection of an optical termination device using reflection characteristics in an optical termination device having a different degree of reflection of light applied to the optical cable according to the termination characteristics of the optical cable. The present invention provides an apparatus and method for detecting an optical termination device of an optical communication network.

In order to achieve the above object, an optical terminal device detecting apparatus for an optical communication network according to an embodiment of the present invention, the optical terminal device detecting apparatus for an optical communication network installed in the optical relay device connected to the plurality of optical terminal devices and optical cables, An optical output unit for outputting an optical signal to the termination device; An optical receiver for receiving a reflected signal for the optical signal output from the optical output unit from the optical termination device; A determination unit that determines whether the optical termination device is connected based on the reflection signal reference value set to detect the connection of the optical termination device and the reflection signal received from the optical receiver; And a controller for controlling the optical output unit, the optical receiver, and the determination unit to determine whether the optical termination device is connected.

The determination unit determines that the optical terminator is not connected when the magnitude of the reflected signal is within the error range of the reference value of the reflection signal, and the optical terminator is connected when the magnitude of the reflected signal is outside the error range of the reference value of the reflection signal. To judge.

The optical receiver further includes a calculator configured to calculate a reflection time reference value using the reflection signal reception time at which the reflection signal for the optical signal is received.

The calculation unit calculates the reflection point at which the reflection signal occurred based on the reflection signal reception time, and calculates the optical cable transmission loss to the reflection point and the reflection coefficient at the end of the connector.

The calculation unit is the following equation

Where P2 is the reflected signal magnitude when no optical termination device is connected, αL is the transmission loss of the optical cable, rEND is the reflection coefficient at the connector end, and PRN is the intensity of the output optical signal of the optical relay device. The reference value of the reflected signal is calculated by substituting the optical cable transmission loss calculated based on time, the reflection coefficient at the end of the connector, and the intensity of the output optical signal of the optical repeater.

The optical receiver further includes a time measuring unit measuring a reflection signal reception time at which the reflection signal for the optical signal is received.

In order to achieve the above object, the optical terminal device detecting apparatus of the optical communication network according to another embodiment of the present invention, the optical communication network is installed in the optical relay device for transmitting the optical signal to the plurality of optical terminal devices connected by the optical cable A terminal detecting device comprising: an optical output unit for outputting a first optical signal and a second optical signal having different wavelengths; An optical receiver configured to receive a first reflection signal corresponding to the first optical signal and a second reflection signal corresponding to the second optical signal; A determination unit determining a connection state of the optical termination device based on the first reflection signal and the second reflection signal received through the light reception unit; And a control unit for controlling the optical output unit, the light receiving unit and the determination unit to determine the connection state of the optical termination device.

The determination unit determines whether the optical termination device is connected based on the first reflection signal or the second reflection signal.

The determination unit determines that the optical termination device is not connected when the magnitudes of the first reflection signal and the second reflection signal are the same, and determines that the optical termination device is connected when the magnitudes of the first reflection signal and the second reflection signal are different.

The determination unit compares the magnitude of the first reflection signal or the second reflection signal with a reflection signal reference value corresponding to the reflection signal to determine whether a signal attenuation occurs in the optical cable connecting the optical relay device and the optical termination device.

The determination unit determines that the signal attenuation of the optical cable occurs when the magnitude of the first reflection signal or the second reflection signal is less than the reflection signal reference value corresponding to the reflection signal.

The determination unit determines whether the optical cable connecting the optical relay device and the optical termination device is damaged based on the magnitude of the first reflection signal and the second reflection signal.

The determination unit determines that damage of the optical cable occurs when the magnitude of the first reflection signal and the second reflection signal are the same and less than the reflection signal reference value.

The apparatus may further include a calculation unit configured to calculate a reflection signal reference value, which is a magnitude of a reflection signal expected when the optical cable is in a normal state, based on the length of the optical cable connecting the optical relay device and the optical termination device.

The calculating unit calculates the length of the optical cable based on the reception time of the first reflection signal or the second reflection signal.

The determining unit may determine whether or not an optical termination device is connected, whether a signal attenuation occurs in an optical cable connecting the optical relay device and the optical termination device, and whether or not there is damage, based on the magnitude levels of the first reflection signal and the second reflection signal respectively divided into a plurality of levels. Determine the connection state of the optical termination device including at least one of the.

When the reflection coefficient of the optical termination device exceeds the reflection coefficient of the optical cable terminal without the optical termination device connection, the determination unit determines that the optical cable is damaged when the first reflection signal and the second reflection signal are at the first size level. If the reflected signal is at the first size level and the second reflected signal is at the second size level, it is determined that the optical termination device is connected to the optical cable in a steady state, and the first reflected signal is at the first size level and the second reflected signal is at the third size. At the level, it is determined that the optical terminator is connected to the optical cable with weak signal attenuation. If the first and second reflection signals are at the second level level, it is determined that the optical cable is damaged, and the first reflection signal is at the second level level. If the second reflection signal is the third size level, it is determined that the optical termination device is connected to the optical cable with signal attenuation, and if the first reflection signal and the second reflection signal are the third size level, The optical termination equipment is not connected to, or is determined to have occurred to damage the fiber.

If the reflection coefficient of the optical termination unit is less than the reflection coefficient of the end of the optical cable without the connection of the optical terminator, the optical terminator is not connected to the optical cable or the optical cable is damaged when the first reflection signal and the second reflection signal are at the first size level. And the first reflection signal is the first size level and the second reflection signal is the second size level, it is determined that the optical termination device is connected to the optical cable in the normal state, and the first reflection signal is the first size level. If the second reflection signal is at the third size level, it is determined that the optical termination device is connected to the optical cable with weak signal attenuation. If the first reflection signal and the second reflection signal are at the second size level, the optical termination device is not connected to the optical cable. The optical cable with signal attenuation is determined to be damaged and the first reflected signal is at the second magnitude level and the second reflected signal is at the third magnitude level. It determines that the optical termination unit is connected, and, if the first reflected signal and a second signal reflecting the size of the third level is determined as a damage of the optical cable.

In order to achieve the above object, an optical terminal device detecting method of an optical communication network according to an embodiment of the present invention, the optical terminal device in the optical communication device connected to a plurality of optical terminal device and the optical cable, the optical output device in the optical communication device, Outputting an optical signal to the optical termination device; Receiving, by the optical receiver, a reflection signal for the output optical signal from the optical termination device; And determining, by the determining unit, whether the optical termination device is connected based on the reflection signal reference value and the received reflection signal.

The determining whether the optical termination device is connected or not may include determining that the optical termination device is not connected when the magnitude of the reflected signal is within an error range of the reference value of the reflected signal. If it is out of value, it is determined that the optical termination device is connected.

The calculation unit may further include calculating a reflection time reference value by using the reflection signal reception time, which is a time at which the reflection signal with respect to the output optical signal is received.

The calculating of the reflection time reference value may include: calculating, by the calculation unit, a reflection point at which the reflection signal is generated based on the reflection signal reception time; And calculating, by the calculating unit, the optical cable transmission loss to the reflection point and the reflection coefficient of the connector end.

The following equation by the calculation unit

Where P2 is the reflected signal magnitude when no optical termination device is connected, αL is the transmission loss of the optical cable, rEND is the reflection coefficient at the connector end, and PRN is the intensity of the output optical signal of the optical relay device. And calculating the reflected signal reference value by substituting the optical cable transmission loss calculated based on time, the reflection coefficient at the end of the connector, and the intensity of the output optical signal of the optical relay device.

The method may further include measuring, by the time measuring unit, a reflection signal reception time, which is a time at which the reflection signal with respect to the optical signal is received.

According to another aspect of the present invention, there is provided a method for detecting an optical termination device of an optical communication network, the optical termination device of an optical communication network in an optical relay device for transmitting an optical signal to a plurality of optical termination devices connected by an optical cable. A detection method, comprising: outputting, by an optical output unit, a first optical signal and a second optical signal having different wavelengths; Receiving, by the light receiving unit, a first reflection signal corresponding to the first optical signal and a second reflection signal corresponding to the second optical signal; And determining, by the determining unit, the connection state of the optical termination device based on the received first and second reflection signals.

In the determining, it is determined whether the optical termination device and the optical relay device are connected based on the first reflection signal or the second reflection signal.

The determining may include determining that the optical termination device is not connected to the optical relay device when the first and second reflection signals have the same magnitude. If the first reflection signal and the second reflection signal have different magnitudes, the optical relay device determines that the optical reflection device has a different magnitude. It is determined that the optical termination device is connected.

In the determining, the signal attenuation of the optical cable connecting the optical relay device and the optical termination device is determined by comparing the magnitude of the first reflection signal or the second reflection signal with a reflection signal reference value corresponding to the reflection signal.

In the determining, if the magnitude of the first reflection signal or the second reflection signal is less than the reflection signal reference value corresponding to the reflection signal, it is determined that the signal attenuation of the optical cable is generated.

In the determining, the damage of the optical cable connecting the optical relay device and the optical termination device is determined based on the magnitude of the first reflection signal and the second reflection signal.

In the determining step, if the magnitude of the first reflection signal and the second reflection signal are the same and less than the reflection signal reference value, it is determined that the optical cable is damaged.

The calculating unit may further include calculating a reflection signal reference value, which is a magnitude of a reflection signal expected when the optical cable is in a normal state, based on the length of the optical cable connecting the optical relay device and the optical termination device.

In the calculating step, the length of the optical cable is calculated based on the reception time of the first reflection signal or the second reflection signal.

In the determining step, whether the optical terminator is connected or whether the signal attenuation of the optical cable connecting the optical repeater and the optical terminator occurs based on the magnitude level of the first and second reflection signals divided into three levels. And determining the connection state of the optical termination device and the optical relay device including at least one of whether or not damage occurs.

In the determining step, when the reflection coefficient of the optical termination device exceeds the reflection coefficient of the end of the optical cable without the connection of the optical termination device, it is determined that the optical cable is damaged when the first reflection signal and the second reflection signal are at the first size level. If the first reflection signal is the first size level and the second reflection signal is the second size level, it is determined that the optical termination device is connected to the optical cable in a steady state, and the first reflection signal is the first size level and the second reflection signal is the third size. If the magnitude level is determined, the optical termination device is connected to the optical cable with weak signal attenuation. If the first reflection signal and the second reflection signal are at the second size level, it is determined that the optical cable is damaged and the first reflection signal is the second size. Level and the second reflection signal is the third size level, it is determined that the optical termination device is connected to the optical cable with signal attenuation, and if the first reflection signal and the second reflection signal are the third size level, It determines that the optical block or terminating equipment is not connected to the occurrence of damage to the optical cable.

The determining may include determining that the optical termination device is not connected to the optical cable or the optical cable is not connected to the optical cable when the first reflection signal and the second reflection signal are at the first size level when the reflection coefficient of the optical termination device is less than the reflection coefficient of the end of the optical cable without the connection of the optical termination device. If the first reflection signal is the first size level and the second reflection signal is the second size level, it is determined that the optical termination device is connected to the optical cable in a steady state, and the first reflection signal is the first size. Level and the second reflection signal is at the third size level, it is determined that the optical termination device is connected to the optical cable with weak signal attenuation, and the optical termination device is connected to the optical cable when the first reflection signal and the second reflection signal are at the second size level. Or the optical cable is judged to be damaged, and if the first reflected signal is at the second magnitude level and the second reflected signal is at the third magnitude level, It is determined that the optical termination device is connected to the cable, and it is determined that the optical cable is damaged when the first reflection signal and the second reflection signal are at the third size level.

According to the present invention, the optical terminal device detecting apparatus and method of the optical communication network detects the optical terminal device by using the characteristic that the degree of reflection of the optical signal applied to the optical cable is different according to the termination characteristic of the optical cable, thereby reducing the power supply of the optical terminal device. Even when it is turned off, there is an effect of detecting the presence or absence of the connection of the optical termination device.

Incidentally, the optical termination device detection method and method of the optical communication network detects the connection of the optical termination device even when the power supply of the optical termination device is turned off, thereby incorrectly determining that the power supply is turned off, so that the user does not have the optical termination device. Determining and removing the corresponding optical cable or connecting to another user has the effect of providing a stable optical communication service to the user by solving the conventional problem that the existing user can not use the normal service.

In addition, the optical terminal device detecting apparatus and method of the optical communication network detects the connection state of the optical terminal device by using the reflected signal of the two optical signals of different wavelengths, thereby preventing signal attenuation and damage of the optical cable due to bending, bending, etc. of the optical cable. Even in the generated state, there is an effect of detecting the optical termination device connection state.

In addition, the apparatus and method for detecting the optical termination device of the optical communication network calculates the position of the signal attenuation section, the damage section, etc. by using the reception time of the reflected signal, thereby reducing the time and cost required for repair work in the event of signal attenuation and damage of the optical cable. Minimize the time, and minimize the time that the optical communication service is stopped by the signal attenuation and damage occurrence repair of the optical cable has the effect that can provide a stable optical communication service to the user.

1 is a view for explaining the basic connection structure of the FTTH optical network.
2 and 3 are views for explaining an optical terminal device detection apparatus and method for an optical communication network according to the present invention.
4 is a block diagram illustrating an optical termination device detection apparatus of an optical communication network according to a first embodiment of the present invention.
5 is a flowchart illustrating a method for detecting an optical termination device of an optical communication network according to a first embodiment of the present invention.
6 is a block diagram illustrating an optical termination device detection apparatus of an optical communication network according to a second embodiment of the present invention.
7 to 11 are views for explaining the determination unit of FIG.
12 is a flowchart illustrating a method of detecting whether an optical terminal device is connected in the optical terminal device detecting method of the optical communication network according to the second embodiment of the present invention.
FIG. 13 is a flowchart for explaining a method of detecting whether a signal attenuation occurs in an optical cable of an optical termination device detection method of an optical communication network according to a second embodiment of the present invention; FIG.
14 is a flowchart for explaining a method of detecting whether an optical cable is damaged in the optical termination device detecting method of the optical communication network according to the second embodiment of the present invention.
FIG. 15 is a flowchart illustrating a method of detecting an optical termination device connection state of the optical termination device detecting method of the optical communication network according to the second embodiment of the present invention; FIG.

Hereinafter, the preferred 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 technical idea of the present invention. . First of all, in adding reference numerals to the components of each drawing, it should be noted that the same reference numerals are used as much as possible even if displayed on different drawings. In the following description of the present invention, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear.

(Embodiment 1)

First, an optical terminal detecting apparatus and method for an optical communication network according to a first embodiment of the present invention will be described. 2 and 3 are diagrams for explaining an optical terminal device detecting apparatus and method for an optical communication network according to a first embodiment of the present invention.

In the present invention, the presence or absence of connection of the optical termination device 30 is detected by using the fact that the degree of reflection of light applied to the optical cable 40 is different according to the termination characteristic of the optical cable 40. To this end, as shown in FIG. 2, when an optical signal is applied at one end of the optical cable 40 (actually, the optical relay device 20 side), the optical signal proceeds along the optical cable 40 and at the end. Reflection occurs. In this case, the degree of reflection is determined by the reflection coefficient of the terminal, and the connector installed at the end of the optical cable 40 has a constant reflection coefficient because the terminal is terminated to a predetermined standard.

As shown in FIG. 3, the optical signal input portion 32 of the optical termination device 30 reflects a reflection different from the reflection coefficient r _END at the connector portion of the optical cable 40 due to the characteristics of the connection connector and the optical element used. The coefficient r _ONT is shown. Therefore, the intensity of the optical signal reflected when the optical cable 40 and the optical termination device 30 are connected or not is changed, and when the optical cable 40 is detected, the presence or absence of the optical termination device 30 can be determined.

, 광 종단 장치(30)의 광신호 입력부의 반사계수를 r_ONT, 아무것도 연결되지 않은 광케이블(40) 종단의 반사계수를 r_END, 광케이블(40)과 광 종단 장치(30)를 연결했을 때의 접속손실을

, 광 중계 장치(20)에 인가되는 광신호의 세기를 P_IN으로 하면, 광 종단 장치(30)가 연결되어 있는 경우 광 중계 장치(20)에서 측정되는 반사신호의 크기는 신호의 왕복을 고려하면 하기의 수학식 1과 같이 나타낼 수 있다.Transmission loss of the fixed length optical cable 40

When the reflection coefficient of the optical signal input portion of the optical termination device 30 is r _ONT , the reflection coefficient of the termination of the optical cable 40 with no connection r _END , and when the optical cable 40 and the optical termination device 30 are connected, Connection loss

When the intensity of the optical signal applied to the optical relay device 20 is P _IN , when the optical termination device 30 is connected, the magnitude of the reflected signal measured by the optical relay device 20 takes into consideration the round trip of the signal. It may be expressed as Equation 1 below.

In addition, the reflection signal magnitude when the optical termination device 30 is not connected may be represented by Equation 2 below.

Since the transmission speed of the optical signal is constant, when the reflected signal is observed, the time at which the reflection occurs can be determined by measuring the time when the signal is reflected and returned after the incident signal (that is, the round-trip time). In addition, when the optical cable 40 and the connector are manufactured according to the standard, a _L according to the distance and the reflection coefficient r _END of the connector end are determined. Therefore, when P _IN is known, P ₂ can be determined in advance through calculation. .

와 r_END의 차이에 따라서 P₁과 P₂에 차이가 발생하므로, 반사신호가 특정 위치에서 관측됐을 때 미리 계산을 통해 결정한 P₂에 비해 실제 관측된 P₁이 차이를 보이면 광 종단 장치(30)가 연결되어 있는 것으로 판단할 수 있다.
At this time,

Since the difference between P ₁ and P ₂ occurs according to the difference between and r _END , when the reflected signal is observed at a specific position, if the actual observed P ₁ shows a difference from P ₂ determined through calculation in advance, the optical termination device (30 ) Can be determined to be connected.

Hereinafter, an optical termination device detecting apparatus for an optical communication network according to a first embodiment of the present invention will be described in detail with reference to the accompanying drawings. 4 is a block diagram illustrating an optical termination device detection apparatus of an optical communication network according to a first embodiment of the present invention.

As shown in FIG. 4, the optical terminal device detecting apparatus 100 of the optical communication network is connected to the optical terminal device 30 through the optical cable 40, the optical output unit 110, the optical receiving unit 120, and the time. The measurement unit 130, the calculation unit 140, the determination unit 150, the control unit 160, and the display unit 170 are configured to be included.

The optical output unit 110 outputs an optical signal to the optical termination device 30. That is, the optical output unit 110 outputs an optical signal having a predetermined size to the optical cable 40. Accordingly, the output optical signal is transmitted to the optical termination device 30 through the optical cable 40.

The optical receiver 120 receives a reflection signal for the optical signal output from the optical output unit 110 from the optical termination device 30. That is, the optical receiver 120 receives the reflected signal reflected back by the optical termination device 30 (or the end of the optical cable 40). At this time, the optical receiver 120 receives a reflected signal having a smaller size than the output optical signal according to the termination of the optical cable 40 or the reflection coefficient of the optical termination device 30.

The time measuring unit 130 measures the reflection signal reception time at which the light reception unit 120 receives the reflection signal for the optical signal. That is, the time measuring unit 130 generates the reflected signal reception time by measuring the time from the time the optical signal is output from the optical output unit 110 to the time of receiving the reflected signal from the optical receiver 120.

The calculation unit 140 calculates the reflection signal reference value by using the reflection signal reception time at which the reflection signal for the optical signal is received by the light receiver 120. That is, the calculator 140 calculates a reflection point at which the reflection signal is generated based on the reflection signal reception time. The calculation unit 140 calculates the transmission loss of the optical cable 40 to the previously calculated reflection point and the reflection coefficient at the end of the connector. The calculation unit 140 calculates the reflection signal reference value by substituting the transmission loss of the optical cable 40 calculated in Equation 2 above, the reflection coefficient at the end of the connector, and the intensity of the output optical signal of the optical relay device 20. Here, the details of calculating the reflection point and the transmission loss and the reflection coefficient of the terminal using the reflection signal reception time and the reflection point are easily understood by those skilled in the art, and thus detailed descriptions thereof will be omitted.

The determination unit 150 determines whether the optical termination device 30 is connected based on the reflection signal reference value set to detect the connection of the optical termination device 30 and the reflection signal received by the optical receiver 120. At this time, the determination unit 150 determines that the optical termination device 30 is not connected when the magnitude of the reflected signal is within the error range of the reflection signal reference value, and the magnitude of the reflection signal is outside the reflection signal reference value and the error range. If it is a value, it is determined that the optical termination device 30 is connected. Here, the error range of the reflected signal reference value may be changed and set according to the reflection characteristics of the optical cable 40 and the connector.

The controller 160 controls the light output unit 110, the light receiving unit 120, the time measuring unit 130, the calculating unit 140, and the determining unit 150 to determine whether the optical terminator 30 is connected. In addition, the display unit 170 is controlled to display the determination result of the determination unit 150 as to whether the optical termination device 30 is connected.

The display unit 170 displays the determination result of the determination unit 150 under the control of the controller 160. That is, the display unit 170 displays the connection of the optical termination device 30 by a method such as a screen output or a voice output to inform the operator of the connection of the optical termination device 30.

Hereinafter, an optical termination device detection method of an optical communication network according to a first embodiment of the present invention will be described in detail with reference to the accompanying drawings. 5 is a flowchart illustrating a method for detecting an optical termination device of an optical communication network according to a first embodiment of the present invention.

When the optical output unit 110 outputs the optical signal to the optical cable 40 (S100), the time measuring unit 130 starts measuring the reflection signal reception time (S105).

At this time, when the reflection signal for the optical signal output in step S100 is received by the optical receiver 120 (S110; YES), the time measuring unit 130 ends the measurement of the reflection signal reception time.

The calculation unit 140 calculates the reflection point using the measured reflection signal reception time (S115), and calculates the transmission loss and the reflection coefficient of the connector end using the calculated reflection point (S120).

The calculating unit 140 calculates the reflected signal reference value using the optical cable 40 transmission loss calculated in steps S115 and S120, the reflection coefficient at the end of the connector, and the intensity of the output optical signal of the optical relay device 20 (S125). ).

If the magnitude of the received reflection signal is within an error range of the calculated reflection signal reference value (S130; YES), the determination unit 150 indicates that the optical termination device 30 is not connected to the optical relay device 20. It is determined (S135). In this case, the determination unit 150 determines that the optical termination device 30 is connected to the optical relay device 20 when the magnitude of the received reflection signal is outside the error range of the calculated reflection signal reference value (S140). Here, the error range of the reflected signal reference value may be changed and set according to the reflection characteristics of the optical cable 40 and the connector.

The display unit 170 displays the determination result of the determination unit 150 to inform the operator whether the optical termination device 30 is connected (S150). That is, when the determination unit 150 determines whether the optical termination device 30 is connected, the controller 160 generates a control signal for controlling to display the determination result of the determination unit 150. The display unit 170 outputs the determination result of the determination unit 150 to the screen, voice, etc. according to the control signal from the control unit 160.

As described above, the apparatus and method for detecting the optical termination device of the optical communication network according to the first embodiment of the present invention are characterized in that the degree of reflection of the optical signal applied to the optical cable 40 is different depending on the termination characteristic of the optical cable 40. By detecting the optical termination device 30 by using the same, the presence or absence of the connection of the optical termination device 30 can be detected even when the power supply of the optical termination device 30 is turned off.

In addition, the apparatus and method for detecting the optical termination device of the optical communication network according to the first embodiment of the present invention detects the connection of the optical termination device 30 even when the power supply of the optical termination device 30 is turned off. If the user determines that there is no optical termination device 30 due to the incorrect determination of the off state, and removes the optical cable or connects to another user, the existing user solves the conventional problem of not using the normal service to provide a stable optical communication service to the user. There is an effect that can be provided.

(Second Embodiment)

First, prior to describing the second embodiment of the present invention, an optical terminal detecting apparatus and method for an optical communication network according to the present invention will be described.

In actual application of the optical termination device detection apparatus and method according to the first embodiment, the detection accuracy of the optical termination device 30 may be degraded in the following two cases caused by the abnormal shape of the optical cable 40.

The first is a case in which severe bending or bending occurs in the middle of the optical cable 40, resulting in an abnormally large transmission loss. In this case, if the additional transmission loss is β (0 <β <1), P ₁ is changed as in Equation 3 below.

을 비교하게 되는데, 광 종단 장치(30)의 연결시 반사량이 많은 경우(즉,

인 경우), β2에 의해

이 된다. 그에 따라,

과 P₂가 비슷한 값을 나타낼 수 있다. 이 경우에는 광 종단 장치(30)가 연결되지 않았더라도 광 종단 장치(30)가 연결된 것으로 판단할 수 있다.P ₁ and also to determine whether the optical termination device 30 is connected

When the optical termination device 30 is connected when the amount of reflection is large (that is,

), By β2

. thereafter,

And P ₂ can represent similar values. In this case, it may be determined that the optical termination device 30 is connected even if the optical termination device 30 is not connected.

Second is the case that the optical cable 40 is cut or severely damaged. In the cut / damaged portion of the optical cable 40, reflection or attenuation of the optical signal occurs. At this time, in the cut / damaged portion of the optical cable 40, unlike the connector portion made by the standard, the change in reflectance is severe.

When the cutting / damage of the optical cable 40 occurs, the reflection signal magnitude when the optical termination device 30 is not connected may be expressed by Equation 4 below.

The reflection coefficient r _END of the normal optical cable 40 has a value between 0 and 1, whereas the reflection coefficient r _CUT of the optical cable 40 in which the cutting / damage of the optical cable 40 has occurred is 1 or more depending on the situation. It can also represent a value.

Therefore, the reflection coefficient of the normal optical cable 40 is smaller than the reflection coefficient of the optical cable 40 in which the cutting / damage occurs while the length of the cable processed by the connector is the same as that of the cut cable (that is, r _CUT > r _END ). .

> P₂가 되어 광 종단 장치(30)가 연결되어 있는 것으로 판단할 수도 있다. 물론, 이 경우에도 정해진 규격에 따른 P₁을 미리 알고 있는 경우 P₁과

의 차이가 크게 나타난다면 광 종단 장치(30)가 연결되지 않은 것으로 판단할 수도 있다. 하지만, 실제 광케이블(40)과 광 종단 장치(30)의 연결 부위의 특성(즉, α_C의 편차) 및 기기별로 광 종단장치 입력부의 광소자의 특성의 편차 등으로 인해 P₁을 정확히 산출(예상)하는 것은 쉽지 않다.In this case

It may be determined that the optical termination device 30 is connected to> P ₂ . Of course, if you have prior knowledge of P ₁ in accordance with the prescribed standards, even if P ₁ and

If the difference is large, it may be determined that the optical termination device 30 is not connected. However, P ₁ is accurately calculated due to characteristics of the connection portion of the optical cable 40 and the optical terminator 30 (that is, a deviation of α _C ) and characteristics of the optical element of the optical terminator input unit for each device. It's not easy.

Accordingly, in the optical terminal device detecting apparatus and method of the optical communication network according to the second embodiment of the present invention, in order to increase the detection accuracy of the optical terminal device 30 even when the optical cable 40 is bent, bent, cut or damaged. An apparatus and method for detecting an optical termination device of an optical communication network using light sources having two different wavelengths are provided.

Since the optical termination device 30 separates and uses only an optical signal having a wavelength used for communication by using an optical filter, the reflection coefficient is generally different according to the wavelength. However, in the case of the optical cable 40, the difference of the reflection coefficient according to the wavelength is not large. By utilizing this point, it is possible to more accurately determine whether or not the optical termination device 30 is connected.

The wavelengths of the two light sources are λ ₁ and λ ₂ , respectively, and the reflection coefficients of the optical termination device 30 are represented by r _ONT (λ ₁ ) and r _ONT (λ ₂ ), respectively. Here, assuming that r _ONT (λ ₁ )> r _ONT (λ ₂ ), the reflectance tends to be different depending on the connector method of the optical cable 40. That is, if the connector is an APC (Angled Physical Contact) method, the reflection amount when the optical terminator 30 is connected is larger than the reflection amount when no connection is made (that is, r _ONT (λ ₁ )> r _ONT (λ ₂ )> r _END ), when the connector is UPC (Ultra Physical Contact) system, the amount of reflection when the optical terminator 30 is connected is small (that is, r _END > r _ONT (λ ₁ )> r _ONT (λ ₂ )).

Therefore, when the optical relay device 20 applies two optical signals having different wavelengths and measures the magnitudes of the reflection signals corresponding to the respective optical signals, it is determined that the optical termination device 30 is connected when the magnitudes of the two reflection signals are different. can do. In this case, when the applied optical signal is a narrow pulse, the distance to the optical termination device 30 may also be measured by measuring the time when the reflected signal is returned.

Hereinafter, an optical end device detecting apparatus for an optical communication network according to a second embodiment of the present invention will be described in detail with reference to the accompanying drawings. FIG. 6 is a block diagram illustrating an apparatus for detecting an optical terminator of an optical communication network according to a second exemplary embodiment of the present invention, and FIGS. 7 to 11 are views for explaining a determination unit of FIG. 6.

First, the optical terminal device detecting apparatus 100 of the optical communication network according to the second embodiment of the present invention is connected to the optical terminal device 30 by using the magnitude of the reflected signal for each of the two optical signals having different wavelengths In determining the state (that is, whether the optical termination device 30 is connected, whether the optical cable 40 is attenuated or damaged), and the optical termination device detection device 100 of the optical communication network according to the first embodiment, There is a difference.

In addition, hereinafter, a case in which the optical cable 40 is connected through an APC (Angled Physical Contact) type connector will be described. Normal optical cable 40 is normal, but additional loss occurs, but the optical cable 40 to the extent that communication is possible to further attenuate, further attenuated severely can not communicate or physical damage to the optical cable 40 is not transmitted signal It is indicated by.

As shown in FIG. 6, the optical terminal device detecting apparatus 100 of the optical communication network is connected to the optical terminal device 30 through the optical cable 40, the optical output unit 110, the optical receiving unit 120, and the time. The measurement unit 130, the calculation unit 140, the determination unit 150, the control unit 160, and the display unit 170 are configured to be included.

The optical output unit 110 outputs the first optical signal and the second optical signal having different wavelengths to the optical termination device 30. In this case, the first optical signal and the second optical signal output by the optical output unit 110 have the same magnitude.

The optical receiver 120 receives a first reflection signal corresponding to the first optical signal and a second reflection signal corresponding to the second optical signal from the optical termination device 30. Here, when the optical terminator 30 is connected to the optical cable 40, the optical receiver 120 receives the first and second reflection signals in size. The light receiving unit 120 includes a first reflection signal and a second reflection signal having a constant (same) size regardless of the wavelength when the optical termination device 30 is not connected and the cable is cut / damaged or further attenuated. Is received.

The time measuring unit 130 measures the reflection signal reception time at which the light reception unit 120 receives the reflection signal for the optical signal. That is, the time measuring unit 130 measures the time from the time when the first optical signal is output by the optical output unit 110 to the time when the first receiving signal is received by the light receiving unit 120 to measure the first reflection signal receiving time. Create The time measuring unit 130 generates a second reflection signal reception time by measuring a time from a time when the second optical signal is output from the optical output unit 110 to a time when the light receiving unit 120 receives the second reflection signal. .

Based on the length of the optical cable 40 connecting the optical relay device 20 and the optical termination device 30, the calculation unit 140 is a reflection signal that is the magnitude of the reflection signal expected when the optical cable 40 is in a normal state. Calculate the reference value. In this case, the calculator 140 calculates a first reflection signal reference value that is a reference value for the first reflection signal and a second reflection signal reference value that is a reference value for the second reflection signal.

The calculator 140 calculates the length of the optical cable 40 based on the reception time of the first reflection signal or the second reflection signal. Here, the calculator 140 calculates the length of the optical cable 40 to calculate the signal attenuation occurrence position or damage occurrence position of the optical cable 40.

The determination unit 150 determines a connection state between the optical termination device 30 and the optical relay device 20 based on the first reflection signal and the second reflection signal received through the optical receiver 120. At this time, the determination unit 150 determines that the optical termination device 30 is not connected to the optical relay device 20 when the first reflection signal and the second reflection signal have the same magnitude, and the first reflection signal and the second reflection signal. If the magnitudes of the signals are different, it is determined that the optical termination device 30 is connected to the optical relay device 20. That is, the determination unit 150 determines whether the optical termination device 30 is connected by using a reflection characteristic (that is, a reflection coefficient) that is changed depending on whether the optical termination device 30 is connected. In this case, the reflection characteristics changed depending on whether the optical termination device 30 is connected will be described. In the case of the optical cable 40 in a steady state, optical signals of two wavelengths are transmitted at a constant (determined) loss rate according to the characteristics of the optical cable 40. do. In this case, assuming that the reflection coefficient of the terminal device for the first optical signal is rONT (λ1) and the reflection coefficient of the terminal device for the second optical signal is rONT (λ2), as shown in FIG. 7, the optical cable 40 In the case where the optical termination device 30 is connected to the end of the X-ray), the first reflection signal 300a for the first optical signal 200a appears large and the second reflection signal 300b for the second optical signal 200b. Appears relatively small. On the other hand, when the optical termination device 30 is not connected to the end of the optical cable 40, the reflection characteristics of the wavelengths of the first optical signal 200a and the second optical signal 200b have almost no difference and the degree of reflection It is smaller than the optical termination device 30. That is, the first reflection signal 300a and the second reflection signal 300b received by the optical receiver 120 are almost the same and their size is very small.

The determination unit 150 compares the magnitude of the first reflection signal or the second reflection signal with a reflection signal reference value corresponding to the reflection signal to connect the optical relay device 20 and the optical termination device 30. It may be determined whether the signal attenuation occurs. At this time, the determination unit 150 determines that the signal attenuation of the optical cable 40 occurs when the magnitude of the first reflection signal or the second reflection signal is less than the reflection signal reference value corresponding to the reflection signal. That is, the determination unit 150 uses the characteristic that the reflected signal in the case where there is an additional attenuation factor such as bending and bending of the optical cable 40 is smaller than the reflected signal in the optical cable 40 in the normal state. It is to determine whether additional attenuation of the optical cable 40 connected to the (30) occurs. At this time, it is assumed that the reflection coefficient of the terminal device with respect to the first optical signal is r _ONT (λ ₁ ) and the reflection coefficient of the terminal device with respect to the second optical signal is r _ONT (λ ₂ ). Referring to the reflection characteristic changed depending on whether the connection, as shown in Figure 8, when there is an additional attenuation section (that is, section A) in the optical cable 40 connected to the optical termination device 30, the first optical signal The first reflection signal 300a and the second reflection signal 300b for each of the 200a and the second optical signal 200b are further attenuated in an additional attenuation period, so that the reflected signal from the optical cable 40 in the steady state is generated. Has a small size compared to

Here, the first reflection signal 300a and the second reflection signal 300b are attenuated, even when the reflection signal in the case where there is an additional attenuation factor is smaller than the reflection signal in the optical cable 40 in the normal state. Except that the signal attenuation in the size is smaller than the reflection signals from the optical cable 40 in the normal state, the reflection characteristics that are changed depending on whether the optical termination device 30 described with reference to FIG. Reflection coefficient). Accordingly, the determination unit 150 may determine whether the optical termination device 30 is connected together with whether or not signal attenuation occurs.

인 경우는 절단/손상임을 정확하게 판정할 수 있다.The determination unit 150 determines whether the optical cable 40 connecting the optical relay device 20 and the optical termination device 30 is damaged based on the magnitude of the first reflection signal and the second reflection signal. At this time, if the magnitudes of the first reflection signal and the second reflection signal are the same and less than the reflection signal reference value, it is determined that the optical cable 40 is damaged. That is, when the damage occurs in the optical cable 40, the determination unit 150 determines whether the optical cable 40 is damaged by using the characteristic that the optical signal does not reach the end and is reflected at the location where the damage occurs. In this case, when the reflection characteristics change depending on whether the optical termination device 30 is connected, as shown in FIG. 9, when the optical cable 40 has a damaged part (that is, a “B” section), the optical cable 40 ) Does not reach the end of the optical signal, but reflection occurs at the damaged portion (that is, the "B" section). In this case, the reflected signal reflected from the damaged portion (that is, the first reflection signal 300a and the second reflection signal 300b) is a light source (ie, the first light signal 200a output from the light output unit 110, The second optical signal 200b has almost the same size regardless of the wavelength of the second optical signal 200b). Accordingly, the determination unit 150 may first determine that the optical termination device 30 is not connected. At this time, the magnitude of the reflected signal is determined by the damage state. Cutting / damage degree

Can be accurately determined to be cutting / damage.

The determination unit 150 determines whether the optical termination device 30 is connected, the optical relay device 20 and the optical termination device 30 based on the magnitude level of the first reflection signal and the second reflection signal divided into three levels. ) Determines the connection state of the optical termination device 30 and the optical relay device 20 including whether or not signal attenuation occurs and damage occurs. That is, the determination unit 150 sets the magnitude level by dividing the magnitude of the reflected signal with respect to the output optical signal in three stages, compares the magnitude of the first reflection signal and the second reflection signal with the set magnitude level, and compares the optical cable ( The connection state of the optical termination device 30 and the optical relay device 20 including whether the signal attenuation of 40 and the damage occurs is determined. For example, when the magnitude of the reflected signal is in the range of 0 to 10, the determination unit 150 sets the reflection signal having a magnitude of 7 or more and 10 or less to level 1, and reflects having a magnitude of 4 or more and less than 7. The signal is set at level 2, and the reflected signal having a magnitude less than 4 is set at level 3. Here, the magnitude level of the reflection signal may be changed according to the reflection characteristics of the optical cable 40 and the terminal.

If the reflection coefficient of the terminal device exceeds the reflection coefficient of the end of the optical cable 40 without the terminal device connection, the determination unit 150 of the optical cable 40 when the first reflection signal and the second reflection signal is at the first size level. If it is determined that the damage occurs and the first reflection signal is at the first magnitude level and the second reflection signal is at the second magnitude level, it is determined that the terminator is connected to the optical cable 40 in the normal state, and the first reflection signal is the first magnitude. Level and the second reflection signal is at the third size level, it is determined that the terminator is connected to the optical cable 40 with weak signal attenuation, and when the first reflection signal and the second reflection signal are at the second size level, If it is determined that the damage occurs, and the first reflection signal is the second magnitude level and the second reflection signal is the third magnitude level, it is determined that the terminator is connected to the optical cable 40 having the signal attenuation, and the first reflection signal and the second If the reflected signal is at the third level, optical Unsubstituted or termination devices are connected to the block 40 determines that the occurrence of damage to the optical cable (40). That is, when the connector is APC type (that is, when r _ONT > r _END is satisfied), as shown in FIG. 10, the determination unit 150 determines the connection state of the optical cable 40.

If the reflection coefficient of the termination device is less than the reflection coefficient of the end of the optical cable 40 without the termination device connection, the determination unit 150 terminates the termination device in the optical cable 40 if the first reflection signal and the second reflection signal are at the first size level. Is not connected or the optical cable 40 is determined to be damaged, and if the first reflection signal is the first size level and the second reflection signal is the second size level, it is determined that the terminator is connected to the optical cable 40 in the normal state. When the first reflection signal is at the first magnitude level and the second reflection signal is at the third magnitude level, it is determined that the terminator is connected to the optical cable 40 having the weak signal attenuation, and the first reflection signal and the second reflection signal are If it is the second size level, it is determined that the terminator is not connected to the optical cable 40 or the optical cable 40 is damaged. If the first reflection signal is the second size level and the second reflection signal is the third size level, the signal attenuation is determined. Gwangkei with It is determined that the end-devices connected to 40, and determines the damage of the first reflected signal and a second signal is reflected by a third size level optical cable (40). That is, when the connector is the UPC method (that is, when r _ONT <r _END is satisfied), as shown in FIG. 11, the reflection signal when the optical terminator 30 is connected is determined. Since the optical signal is smaller than the reflection signal when the optical terminal device 30 is not connected, the method of determining the connection state of the optical terminal device 30 differs from that of the APC connector.

The controller 160 controls the optical output unit 110, the optical receiver 120, and the determination unit 150 to determine the connection state of the optical termination device 30, and determines whether the optical termination device 30 is connected. The display unit 170 is controlled to display the determination result of the unit 150.

The display unit 170 displays the determination result of the determination unit 150 under the control of the controller 160. That is, the display unit 170 displays the connection of the optical termination device 30 by a method such as a screen output, a voice output, etc. to the operator, whether the optical termination device 30 is connected, whether the signal attenuation of the optical cable 40 occurs, and Indicates whether damage has occurred.

Hereinafter, an optical termination device detection method of an optical communication network according to a second embodiment of the present invention will be described in detail with reference to the accompanying drawings.

12 is a flowchart illustrating a method of detecting whether an optical terminal device is connected to the optical terminal device detecting method of the optical communication network according to the second embodiment of the present invention.

When the optical output unit 110 outputs the first optical signal and the second optical signal having different wavelengths to the optical cable 40 (S210), the optical receiver 120 is connected to the first optical signal and the second optical signal. Receives a reflected signal (ie, a first reflection signal, a second reflection signal).

When the light receiving unit 120 receives the first reflection signal and the second reflection signal (S220; YES), the determination unit 150 compares the magnitudes of the received first reflection signal and the second reflection signal to determine an optical termination device ( 30) determine whether or not to connect.

If the magnitude of the first reflection signal and the magnitude of the second reflection signal are the same (S230; YES), the determination unit 150 determines that the optical termination device 30 is not connected (S240). In this case, if the magnitude of the first reflection signal and the magnitude of the second reflection signal are not the same, the determination unit 150 determines that the optical termination device 30 is connected (S250).

The display unit 170 displays the determination result of the determination unit 150 to inform the operator whether the optical termination device 30 is connected (S260). That is, when the determination unit 150 determines whether the optical termination device 30 is connected, the controller 160 generates a control signal for controlling to display the determination result of the determination unit 150. The display unit 170 outputs the determination result of the determination unit 150 to the screen, voice, etc. according to the control signal from the control unit 160.

FIG. 13 is a flowchart illustrating a method of detecting whether a signal attenuation occurs in an optical cable of an optical termination device detecting method of an optical communication network according to a second exemplary embodiment of the present invention.

When the optical output unit 110 outputs the first optical signal and the second optical signal having different wavelengths to the optical cable 40 (S310), the time measuring unit 130 starts measuring the reflection signal reception time ( S320). At this time, the time measuring unit 130 is a first reflection signal receiving time corresponding to the time when the first reflection signal corresponding to the first optical signal and second reflection signal corresponding to the second reflection signal Measure the 2 reflected signal reception time.

At this time, when the first reflection signal and the second reflection signal are received at the light receiving unit 120 (S330; YES), the time measuring unit 130 ends the measurement of the reflection signal reception time. In this case, the time measuring unit 130 ends the measurement of the first reflection signal receiving time when the first reflection signal is received, and the measurement of the second reflection signal reception time when the second reflection signal is received.

The calculator 140 calculates the length of the optical cable 40 by using the reflected signal reception time measured by the time measurer 130 (S340). Here, the calculator 140 calculates the length of the optical cable 40 based on the first reflection signal reception time or the second reflection signal reception time.

The calculation unit 140 calculates the reflected signal reference value using the length of the optical cable 40 calculated in step S340 (S350). In this case, the calculator 140 calculates a first reflection signal reference value that is a reference value for the first reflection signal and a second reflection signal reference value that is a reference value for the second reflection signal. Here, the reflected signal reference value is the magnitude of the reflected signal expected when the optical cable 40 is in a steady state.

The determination unit 150 compares the magnitude of the reflection signal received in step S330 with the reflection signal reference value calculated in step S350 to determine whether a signal attenuation occurs in the optical cable 40 (S360). That is, the determination unit 150 compares the magnitude of the first reflection signal and the first reflection signal reference value or the magnitude of the second reflection signal and the second reflection signal reference value to determine whether the signal attenuation of the optical cable 40 occurs.

If the magnitude of the first reflection signal is less than the first reflection signal reference value or the magnitude of the second reflection signal is less than the second reflection signal reference value (S360; YES), the optical cable 40 may cause signal attenuation. It is determined (S370). In this case, when the magnitude of the first reflection signal is greater than or equal to the first reflection signal reference value and the magnitude of the second reflection signal is greater than or equal to the second reflection signal reference value, it is determined that there is no signal attenuation of the optical cable 40 (S380).

The display unit 170 displays the determination result of the determination unit 150 to inform the operator whether or not a signal attenuation of the optical cable 40 occurs (S390). That is, when the determination of the signal attenuation of the optical cable 40 is completed in the determination unit 150, the controller 160 generates a control signal for controlling the display of the determination result of the determination unit 150. The display unit 170 outputs the determination result of the determination unit 150 to the screen, voice, etc. according to the control signal from the control unit 160. Here, the time measuring unit 130 measures the reflection signal reception time for receiving the reflection signal for the optical signal from the light receiving unit 120, the calculation unit 140 is the reception time of the first reflection signal or the second reflection signal The signal attenuation generation position may be calculated based on the above. In this case, the display unit 170 displays the signal attenuation occurrence position calculated by the calculator 140.

14 is a flowchart illustrating a method of detecting whether an optical cable damage occurs in the optical termination device detection method of the optical communication network according to the second embodiment of the present invention.

When the optical output unit 110 outputs the first optical signal and the second optical signal having different wavelengths to the optical cable 40 (S400), the time measuring unit 130 starts measuring the reflection signal reception time ( S410). At this time, the time measuring unit 130 is a first reflection signal receiving time corresponding to the time when the first reflection signal corresponding to the first optical signal and second reflection signal corresponding to the second reflection signal Measure the 2 reflected signal reception time.

At this time, when the first reflection signal and the second reflection signal are received by the light receiver 120 (Yes S420), the time measurement unit 130 ends the measurement of the reflection signal reception time. In this case, the time measuring unit 130 ends the measurement of the first reflection signal receiving time when the first reflection signal is received, and the measurement of the second reflection signal reception time when the second reflection signal is received.

The calculator 140 calculates the length of the optical cable 40 by using the reflected signal reception time measured by the time measurer 130 (S430). Here, the calculator 140 calculates the length of the optical cable 40 based on the first reflection signal reception time or the second reflection signal reception time.

The calculation unit 140 calculates the reflected signal reference value using the length of the optical cable 40 calculated in step S430 (S440). In this case, the calculator 140 calculates a first reflection signal reference value that is a reference value for the first reflection signal and a second reflection signal reference value that is a reference value for the second reflection signal. Here, the reflected signal reference value is the magnitude of the reflected signal expected when the optical cable 40 is in a steady state.

The determination unit 150 first compares the magnitude of the first reflection signal with the magnitude of the second reflection signal to determine whether the optical cable 40 is damaged (S450).

If the magnitude of the first reflection signal and the magnitude of the second reflection signal are the same (S450; YES), the determination unit 150 compares the magnitude of the first reflection signal with the reference value of the first reflection signal, and the magnitude of the second reflection signal. And the second reflection signal reference value are compared (S460).

If the magnitude of the first reflection signal is less than the first reflection signal reference value and the magnitude of the second reflection signal is less than the second reflection signal reference value (S460; YES), the determination unit 150 determines that the optical cable 40 is damaged. (S470). At this time, if the determination unit 150 determines that the damage of the optical cable 40, the calculation unit 140 calculates the damage occurrence position of the optical cable 40 based on the reception time of the first reflection signal or the second reflection signal. You may.

Here, when the magnitude of the first reflection signal is different from the magnitude of the second reflection signal, the magnitude of the first reflection signal is greater than or equal to the first reflection signal reference value, or the magnitude of the second reflection signal is greater than or equal to the second reflection signal reference value, the determination unit ( 150 determines that the optical cable 40 is in a normal state without damage (S480).

The display unit 170 displays the determination result of the determination unit 150 to inform the operator whether or not a signal attenuation of the optical cable 40 occurs (S390). That is, when the determination of the signal attenuation of the optical cable 40 is completed in the determination unit 150, the controller 160 generates a control signal for controlling the display of the determination result of the determination unit 150. The display unit 170 outputs the determination result of the determination unit 150 to the screen, voice, etc. according to the control signal from the control unit 160. Here, the display unit 170 displays the damage occurrence position of the optical cable 40 calculated by the calculator 140.

15 is a flowchart illustrating a method of detecting an optical termination device connection state of the optical termination device detection method of the optical communication network according to the second embodiment of the present invention.

When the optical output unit 110 outputs the first optical signal and the second optical signal having different wavelengths to the optical cable 40 (S500), the optical receiver 120 is connected to the first optical signal and the second optical signal. Receives a reflected signal (ie, a first reflection signal, a second reflection signal).

When the light receiving unit 120 receives the first reflection signal and the second reflection signal (S510; YES), the determination unit 150 sets the magnitude levels of the received first reflection signal and the second reflection signal (S520). .

For example, if the magnitude of the reflected signal is 7 or more and 10 or less, it is set to level 1; if the magnitude of the reflected signal is 4 or more and 7 or less, it is set to level 2; do. The determination unit 150 sets the magnitude level of the first reflection signal to level 1 when the magnitude of the first reflection signal is seven, and sets the magnitude level of the second reflection signal to level 3 when the magnitude of the second reflection signal is three. Set to. Here, the magnitude level of the reflected signal is not limited to the above example because it can be changed according to the reflection characteristics of the optical cable 40 and the terminal.

The determination unit 150 determines the connection state of the optical termination device 30 based on the magnitude level of the first reflection signal and the second reflection signal set in step S520 (S530). Here, the determination unit 150 changes the determination criteria according to the method of the connector installed at the end of the optical cable 40. That is, the determination unit 150 sets different criteria for determining the connection state of the optical termination device 30 when using the APC connector and when using the UPC connector. That is, the determination unit 150 uses the criteria shown in FIG. 10 in the case of an APC connector. The determination unit 150 uses the criteria shown in FIG. 11 in the case of the UPC type connector. Here, the content of determining the connection state of the optical termination device 30 based on the magnitude level of the reflected signal is described in detail in the description using FIG. 10 and FIG. 11, and thus description thereof will be omitted.

The display unit 170 displays the determination result of the determination unit 150 to inform the operator whether or not a signal attenuation of the optical cable 40 occurs (S540). That is, when the determination of the connection state of the optical cable 40 is completed in the determination unit 150, the control unit 160 generates a control signal for controlling to display the determination result of the determination unit 150. The display unit 170 outputs the determination result of the determination unit 150 to the screen, voice, etc. according to the control signal from the control unit 160. Here, the time measuring unit 130 measures the reflection signal reception time for receiving the reflection signal for the optical signal from the light receiving unit 120, the calculation unit 140 is the reception time of the first reflection signal or the second reflection signal Based on this, the signal attenuation occurrence position or the damage occurrence position may be calculated. In this case, the display unit 170 displays the signal attenuation occurrence or damage occurrence position calculated by the calculator 140.

As described above, the optical terminal device detecting apparatus and method of the optical communication network according to the second embodiment of the present invention by detecting the connection state of the optical terminal device 30 by using a reflected signal of two optical signals having different wavelengths, Even in a state where signal attenuation and damage of the optical cable 40 occur due to bending, bending, or the like of the optical cable 40, the connection state of the optical termination device 30 can be detected.

In addition, the apparatus and method for detecting the optical termination device of the optical communication network calculates the position of the signal attenuation section, the damage section, etc. using the reception time of the reflected signal, so that the work consumed for repairing the signal attenuation and damage of the optical cable 30 occurs. Minimizing time and cost, and by minimizing the time the optical communication service is interrupted by the signal attenuation and damage occurrence repair of the optical cable 30 can provide a stable optical communication service to the user.

While the present invention has been described in connection with what is presently considered to be practical exemplary embodiments, it is to be understood that the invention is not limited to the disclosed embodiments, but many variations and modifications may be made without departing from the scope of the present invention. It will be understood that the invention may be practiced.

10: optical line device 20: optical relay device
30: optical terminator 32: optical terminator input
40: optical cable 100: optical terminator detection device
110: light output unit 120: light receiving unit
130: time measuring unit 140: calculating unit
150: determination unit 160: control unit
170: display unit 200a: first optical signal
200b: second optical signal 300a: first reflection signal
300b: second reflection signal

Claims (36)

In the optical termination device detection device of an optical communication network provided in an optical relay device connected to a plurality of optical termination device and an optical cable,
An optical output unit configured to output an optical signal to the optical termination device;
An optical receiver which receives a reflected signal for the optical signal output from the optical output unit from the optical termination device;
A determination unit determining whether the optical termination device is connected based on a reflection signal reference value set to detect the connection of the optical termination device and the reflection signal received by the optical receiver; And
A control unit for controlling the optical output unit, the light receiving unit and the determination unit to determine whether the optical termination device is connected,
The determination unit determines that the optical terminator is not connected when the magnitude of the reflected signal is within an error range of the reflection signal reference value, and when the magnitude of the reflection signal is outside of the reflection signal reference value and the error range. And an optical termination device detection apparatus for determining that the optical termination device is connected. delete The method according to claim 1,
And an calculating unit for calculating the reflection signal reference value by using a reflection signal reception time at which the reflection signal for the optical signal is received by the optical reception unit. The method according to claim 3,
The calculating unit calculates,
And calculating a reflection point at which the reflection signal occurs based on the reflection signal reception time, and calculating a transmission loss of the optical cable to the reflection point and a reflection coefficient at the end of the connector. The method according to claim 3,
The calculation unit is the following equation

Where P2 is the reflected signal magnitude when no optical termination device is connected, αL is the transmission loss of the optical cable, rEND is the reflection coefficient at the connector end, and PRN is the intensity of the output optical signal of the optical relay device.
The reference value of the optical communication network is calculated by substituting the optical cable transmission loss calculated based on the reception time of the reflected signal, the reflection coefficient at the end of the connector, and the intensity of the output optical signal of the optical relay device. Terminator detection device. The method according to claim 1,
And a time measuring unit for measuring a reflection signal reception time at which the reflection signal for the optical signal is received by the optical reception unit. Claims [1] An optical end device detecting apparatus of an optical communication network provided in an optical relay device for transmitting an optical signal to a plurality of optical end devices connected by an optical cable.
An optical output unit configured to output a first optical signal and a second optical signal having different wavelengths;
An optical receiver configured to receive a first reflection signal corresponding to the first optical signal and a second reflection signal corresponding to the second optical signal;
A determination unit determining a connection state of the optical termination device based on the first reflection signal and the second reflection signal received through the optical reception unit; And
And a controller for controlling the optical output unit, the optical receiver, and the determination unit to determine the connection state of the optical termination device. The method of claim 7,
The determination unit,
And determining whether the optical termination device is connected based on the first reflection signal or the second reflection signal. The method according to claim 8,
The determination unit,
If the magnitudes of the first and second reflection signals are the same, it is determined that the optical termination device is not connected.
And the optical termination device is connected if the magnitudes of the first and second reflection signals are different from each other. The method of claim 7,
The determination unit,
Comparing the magnitude of the first reflection signal or the second reflection signal with a reflection signal reference value corresponding to the reflection signal to determine whether signal attenuation occurs in an optical cable connecting the optical relay device and the optical termination device; Optical termination device detection device of communication network. The method of claim 10,
The determination unit,
And detecting the signal attenuation of the optical cable when the magnitude of the first reflection signal or the second reflection signal is less than a reflection signal reference value corresponding to the reflection signal. The method of claim 7,
The determination unit
And detecting the damage of the optical cable connecting the optical relay device and the optical termination device based on the magnitude of the first reflection signal and the second reflection signal. The method of claim 12,
The determination unit,
And detecting the damage of the optical cable when the magnitude of the first reflection signal and the second reflection signal are the same and less than the reflection signal reference value. The method of claim 7,
And a calculation unit for calculating a reflection signal reference value which is a magnitude of a reflection signal expected when the optical cable is in a normal state, based on the length of the optical cable connecting the optical relay device and the optical termination device. Optical termination device detection device. The method according to claim 14,
And the calculator calculates a length of the optical cable based on a reception time of the first reflection signal or the second reflection signal. The method of claim 7,
The determination unit,
On the basis of the magnitude level of the first reflection signal and the second reflection signal, each of which is divided into a plurality of levels, whether the optical termination device is connected, whether the signal attenuation of the optical cable connecting the optical relay device and the optical termination device occurs, and whether or not the damage occurs. The optical termination device detection apparatus of the optical communication network, characterized in that for determining the connection state of the optical termination device including at least one. 18. The method of claim 16,
The determination unit, when the reflection coefficient of the optical termination device exceeds the reflection coefficient of the optical cable end without the optical termination device connection,
If the first reflection signal and the second reflection signal is at the first size level, it is determined that the optical cable is damaged.
When the first reflection signal is the first size level and the second reflection signal is the second size level, it is determined that the optical termination device is connected to the optical cable in a normal state,
If the first reflection signal is the first size level and the second reflection signal is the third size level, it is determined that the optical termination device is connected to the optical cable with a weak signal attenuation,
If the first reflection signal and the second reflection signal is at the second magnitude level, it is determined that the optical cable is damaged.
When the first reflection signal is the second size level and the second reflection signal is the third size level, it is determined that the optical termination device is connected to the optical cable with the signal attenuation,
And determining that the optical termination device is not connected to the optical cable or that the optical cable is damaged when the first reflection signal and the second reflection signal are at the third size level. 18. The method of claim 16,
The determination unit, when the reflection coefficient of the optical termination device is less than the reflection coefficient of the optical cable end without the optical termination device connection,
If the first reflection signal and the second reflection signal is the first size level, it is determined that the optical termination device is not connected to the optical cable or that the optical cable is damaged.
When the first reflection signal is the first size level and the second reflection signal is the second size level, it is determined that the optical termination device is connected to the optical cable in a normal state,
If the first reflection signal is the first size level and the second reflection signal is the third size level, it is determined that the optical termination device is connected to the optical cable with a weak signal attenuation,
If the first reflection signal and the second reflection signal is the second level level, it is determined that the optical termination device is not connected to the optical cable or the optical cable is damaged.
When the first reflection signal is the second size level and the second reflection signal is the third size level, it is determined that the optical termination device is connected to the optical cable with the signal attenuation,
And detecting the damage of the optical cable when the first reflection signal and the second reflection signal are at the third size level. In the optical repeater connected to a plurality of optical termination device and an optical cable, the optical termination device detection method of an optical communication network,
Outputting an optical signal to the optical termination device by the optical output unit;
Receiving, by an optical receiver, a reflection signal for the output optical signal from the optical termination device; And
And determining, by the determining unit, whether the optical termination device is connected based on the reflection signal reference value and the received reflection signal.
The determining whether the optical termination device is connected may include determining that the optical termination device is not connected when the magnitude of the reflection signal is within an error range of the reflection signal reference value, and the magnitude of the reflection signal is reflected. If the signal reference value and the value out of the error range, it is determined that the optical termination device is connected. delete The method of claim 19,
And calculating, by the calculation unit, the reflected signal reference value by using the reflected signal reception time, which is a time at which the reflected signal with respect to the output optical signal is received. . 23. The method of claim 21,
The calculating of the reflected signal reference value may include:
Calculating a reflection point at which the reflection signal is generated based on the reflection signal reception time by the calculation unit; And
And calculating the optical cable transmission loss to the reflection point and the reflection coefficient at the end of the connector by the calculating unit. 23. The method of claim 22,
Equation below by the calculation unit

Where P2 is the reflected signal magnitude when no optical termination device is connected, αL is the transmission loss of the optical cable, rEND is the reflection coefficient at the connector end, and PRN is the intensity of the output optical signal of the optical relay device.
And calculating the reflection signal reference value by substituting the optical cable transmission loss calculated based on the reception time of the reflection signal, the reflection coefficient at the end of the connector, and the intensity of the output optical signal of the optical relay device. Optical termination device detection method of an optical communication network. The method of claim 19,
And measuring, by a time measuring unit, a reflection signal reception time which is a time at which the reflection signal with respect to the optical signal is received. In the optical relay device for transmitting an optical signal to a plurality of optical termination devices connected by an optical cable, the optical termination device detection method of an optical communication network,
Outputting, by the light output unit, a first optical signal and a second optical signal having different wavelengths;
Receiving, by an optical receiver, a first reflection signal corresponding to the first optical signal and a second reflection signal corresponding to the second optical signal; And
And determining, by the determining unit, the connection state of the optical termination device based on the received first reflection signal and the second reflection signal. 26. The method of claim 25,
The determining step,
And determining whether the optical termination device and the optical relay device are connected based on the first reflection signal or the second reflection signal. 27. The method of claim 26,
The determining step,
If the magnitudes of the first and second reflection signals are the same, it is determined that the optical termination device is not connected to the optical relay device.
And determining that the optical termination device is connected to the optical relay device when the magnitude of the first reflection signal and the second reflection signal is different from each other. 27. The method of claim 26,
The determining step,
And comparing the magnitude of the first reflection signal or the second reflection signal with a reflection signal reference value corresponding to the reflection signal to determine whether a signal attenuation occurs in an optical cable connecting the optical relay device and the optical termination device. Optical termination device detection method. 27. The method of claim 26,
The determining step,
And detecting the signal attenuation of the optical cable when the magnitude of the first reflection signal or the second reflection signal is less than a reflection signal reference value corresponding to the reflection signal. 26. The method of claim 25,
The determining step,
And determining whether the optical cable connecting the optical relay device and the optical termination device is damaged based on the magnitude of the first reflection signal and the second reflection signal. 32. The method of claim 30,
In the determining,
And detecting the damage of the optical cable when the magnitude of the first reflection signal and the second reflection signal are the same and less than the reflection signal reference value. 26. The method of claim 25,
And calculating, by the calculation unit, a reflection signal reference value which is a magnitude of a reflection signal expected when the optical cable is in a normal state based on the length of the optical cable connecting the optical relay device and the optical termination device. An optical termination device detection method for an optical communication network. The method according to claim 32,
In the calculating step,
And calculating a length of the optical cable based on a reception time of the first reflection signal or the second reflection signal. 26. The method of claim 25,
In the determining,
On the basis of the magnitude level of the first and second reflection signals divided into three levels, the optical termination device is connected, and whether the signal attenuation of the optical cable connecting the optical relay device and the optical termination device occurs and damage is generated. The optical termination device detection method of the optical communication network, characterized in that for determining whether the connection state of the optical termination device and the optical relay device including at least one. 35. The method of claim 34,
In the determining step, when the reflection coefficient of the optical termination device exceeds the reflection coefficient of the optical cable terminal without the optical termination device connection,
If the first reflection signal and the second reflection signal is at the first size level, it is determined that the optical cable is damaged.
When the first reflection signal is the first size level and the second reflection signal is the second size level, it is determined that the optical termination device is connected to the optical cable in a normal state,
If the first reflection signal is the first size level and the second reflection signal is the third size level, it is determined that the optical termination device is connected to the optical cable with a weak signal attenuation,
If the first reflection signal and the second reflection signal is at the second magnitude level, it is determined that the optical cable is damaged.
When the first reflection signal is the second size level and the second reflection signal is the third size level, it is determined that the optical termination device is connected to the optical cable with the signal attenuation,
And if the first reflection signal and the second reflection signal are at a third level, determining that the optical termination device is not connected to the optical cable or that the optical cable has been damaged. 35. The method of claim 34,
The determining may be performed when the reflection coefficient of the optical termination device is less than the reflection coefficient of the optical cable terminal without the optical termination device.
If the first reflection signal and the second reflection signal is the first size level, it is determined that the optical termination device is not connected to the optical cable or that the optical cable is damaged.
When the first reflection signal is the first size level and the second reflection signal is the second size level, it is determined that the optical termination device is connected to the optical cable in a normal state,
If the first reflection signal is the first size level and the second reflection signal is the third size level, it is determined that the optical termination device is connected to the optical cable with a weak signal attenuation,
If the first reflection signal and the second reflection signal is the second level level, it is determined that the optical termination device is not connected to the optical cable or the optical cable is damaged.
When the first reflection signal is the second size level and the second reflection signal is the third size level, it is determined that the optical termination device is connected to the optical cable with the signal attenuation,
And detecting the damage of the optical cable when the first reflection signal and the second reflection signal are at a third size level.

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