KR100917562B1 - System for managing the optical subscriber loops - Google Patents

Abstract

The present invention relates to an optical fiber management system that continuously monitors the optical power of the monitoring signal reflected on the optical fiber beam to monitor the failure of the entire optical beam section, and automatically switches over the optical path when a failure occurs in the optical fiber section. By monitoring the transmission performance of optical fiber in real time, it is possible to reduce the probability of failure by substituting another optical path before failure, and it is economical in terms of maintenance and can provide uninterrupted service to subscribers. There is.

Description

System for managing the optical subscriber loops}

1 is a block diagram of a management system of a light path according to the present invention.

2 is a view showing a detailed configuration and operating principle of the interval type wavelength reflector of FIG.

3 is a view showing the detailed configuration and operating principle of the longitudinal wavelength reflector of FIG.

4 is a view for explaining the detailed configuration and operation of the control device and the PLC type attenuator of FIG.

5 is a flowchart of a communication optical signal and a monitoring optical signal and a reflected monitoring optical signal actually transmitted according to the present invention.

FIG. 6 is a flowchart of an optical signal after a failure occurs in the optical path of FIG. 5 and is automatically switched; FIG.

FIG. 7 is a flowchart of an optical signal after a failure occurs in the optical path of FIG. 6 and is automatically switched; FIG.

<Description of Symbols for Main Parts of Drawings>

5: optical station transceiver

11-1 to 11-3: subscriber optical communication transceiver

6: optical signal transmitter for monitoring

7-1, 7-2: wavelength multiplexing / demultiplexing device                 

8-1 to 8-4: PLC type attenuator

10-1 to 10-3: section type wavelength reflector

10-4 to 10-6: vertical wavelength reflector

14, 15-1 to 15-3: control device

50: transmission performance measurement device

The present invention relates to a light path management system, and more particularly, to continuously monitor the optical power of the monitoring signal reflected on the light path to monitor the failure of the entire optical path section, if the failure occurs in the optical path section Relates to a fiber optic management system for automatic switching.

In a conventional distributed or broadcast optical subscriber network system, communication failure is recognized by exchanging information between the telephone station optical communication transceiver and the subscriber optical communication transceiver using the overhead of the communication protocol.

However, the method of using the overhead of the communication protocol is not only limited to the digital transmission method, but also has the disadvantage that it cannot be used for monitoring or testing the performance of the optical fiber itself and when the subscriber station is in the idle state. Since it does not have the function to restore the line immediately when it occurs, it does not provide efficient service to subscribers.

In order to solve the above-mentioned problems, the present invention aims to always monitor the optical power of a light path, and automatically replace the light path with another light beam when a failure occurs in the light path.

To this end, the present invention is a light path management system used to transmit an optical signal for communication between a subscriber and a telephone station, comprising: a monitoring optical signal transmitting device for outputting a monitoring optical signal for monitoring the optical path; A wavelength multiplexing / demultiplexing device for combining the monitoring optical signal with the communication optical signal or separating the combined signal into the monitoring optical signal and the communication optical signal; A section type wavelength reflector installed in a section of the light path and reflecting a part of the monitoring optical signal; A vertical wavelength reflecting device installed at an end of the subscriber side of the optical path and reflecting a part of the optical signal for monitoring; A planar light wave circuit (PLC) type attenuator connected to the front end of the section type wavelength reflector and the end type wavelength reflector to automatically switch the optical path to convert the movement path of the communication optical signal and the monitoring optical signal; A control device connected to the sectional wavelength reflector and the longitudinal wavelength reflector to detect a reflected optical signal for monitoring and determine a failure of a light path and to control a PLC type attenuator; A transmission performance measuring device for measuring a transmission performance to a light beam using the reflected monitoring optical signal inputted through the optical switch; And an optical circuit for transmitting a monitoring optical signal output from the monitoring optical signal transmitter to a wavelength multiplexing / demultiplexing apparatus or transmitting a reflected monitoring optical signal transmitted from the wavelength multiplexing / demultiplexing apparatus to a transmission performance measuring apparatus. Including a radar, when a failure in the optical path is detected in the transmission performance measuring apparatus, the PLC-type attenuator automatically transfers the failed optical path by the control device.

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

1 is a block diagram of a transmission performance measurement system having an automatic switching function according to the present invention, and the optical signal transmitter 6 for monitoring and wavelength multiplexing / demultiplexing devices 7-1 and 7-2 as main components. , PLC type attenuators 8-1 to 8-4), optical paths 13-5 to 13-22, section wavelength reflectors 10-1 to 10-3, terminal wavelength reflectors 10- 4 to 10-6, and a transmission performance measuring device 50, other than the telephone station optical communication transceiver 5, the subscriber optical communication transceiver 11-1 to 11-3, and the control apparatus 14, 15- 1 to 15-3, an optical circulator 16, an optical switch 51, a pattern generator 52, and optical couplers 12-1 to 12-3.

The monitoring optical signal transmitter 6 generates a constant light source by the pattern generator 52, and the light source is CW (Continuous Wave).

In addition, the optical signal for monitoring uses a wavelength band different from the communication wavelength band used by the telephone station optical communication transceiver 5, and the wavelength line width of the light source is the reflection wavelength of each wavelength reflector 10-1 to 10-6. Wider than the sum of the bandwidths.

The optical signal for monitoring is input to the a port of the optical circulator 16 and output to the b port, and the optical signal for communication of the telephone station optical communication transceiver 5 in the next wavelength multiplexing / demultiplexing device 7-2. Is multiplexed with the output of and inputted into the optical path sections 13-5 to 13-10 through the PLC type attenuator 8-1.

The initial optical signal passed through the PLC type attenuator 8-1 is transmitted to optical paths 13-5, 13-7, and 13-9 on a redundant optical path, 0.1% optical paths 13-6, 13-8, and 13-10.

The section type wavelength reflectors 10-1 to 10-3 reflect only the fiber grating reflection wavelengths set for each device among the transmitted optical signals, and pass the remaining wavelength components to each other. 8-2 to 8-4).

Each optical signal passing through the PLC type attenuators 8-2 to 8-4 is input to the terminal type wavelength reflectors 10-4 to 10-6, and the fiber grating reflection wavelength set for each device is also set here. Only the phone station is reflected to the side.

The remaining unreflected wavelength components are the unreflected wavelength components and the communication wavelength components among the monitoring wavelength band components, among which the pure communication wavelength band components pass through the terminal wavelength reflectors 10-4 to 10-6 and become subscribers. It is transmitted to subscriber optical communication transceivers 11-1 to 11-3 via 3dB optical couplers 12-1 to 12-3 on the side, and the wavelength band components for monitoring are terminated wavelength reflectors 10-4 to 10. -6) is output to anti-reflective termination port.

Here, the role of the 3dB optical couplers 12-1 to 12-3 on the subscriber side is a passive element for always receiving a signal coming through any optical path on the redundant optical path on the subscriber side.

On the contrary to the above-described process, the monitoring reflected optical signal reflected from each of the section type wavelength reflectors 10-1 to 10-3 and the end type wavelength reflectors 10-4 to 10-6, and the subscriber optical communication transceiver The communication optical signal outputted from 11-1 to 11-3 enters the telephone station through the optical paths 13-5 to 13-22.

Among the optical signals, the monitoring wavelength band signal is separated by the wavelength multiplexing / demultiplexing device 7-2 for each communication optical signal and the wavelength band, and is input to the b port of the optical circulator 16 and output to the c port.

Then, the wavelength is separated by the wavelength multiplexer / demultiplexer 7-1 and then input to the transmission performance measuring device 50 through the optical switch 51 and used to measure the transmission performance of the optical path for each section. .

2 shows the configuration and operating principle of any one of these sectioned wavelength reflectors 10-1 to 10-3.

As shown, the segmented wavelength reflector is an asymmetric optical splitter that separates a portion of the optical signal reflected by the fiber grating reflector 22-1 and the fiber grating reflector 22-1 that reflects the optical signal of the set bandwidth ( 19) and an antireflection termination port 20-1 for outputting a part of the reflected optical signal separated from the asymmetric optical splitter 19.

When the monitoring optical signal and the communication optical signal are input to the sectional wavelength reflector, some wavelength bands are reflected by the fiber grating reflector 22-1 to the input side, and the remaining wavelength band components are output to the output side.

That is, when a monitoring optical signal and a communication optical signal having different wavelength bands are input, only a portion except for a specific wavelength band of the monitoring optical signal reflected by the fiber grating reflector 22-1 is output, and the reflected monitoring optical signal is output. The specific wavelength band of is reflected back to the input side.

In this way, the reflection characteristic of the fiber grating reflector 22-1 causes reflection in a specific wavelength band within the monitoring wavelength band, thereby making it possible to differentiate the reflection wavelength of each wavelength reflector.

In addition, the asymmetric optical splitter 19 functions to separate some of the reflected optical signal into the non-reflective termination port 20-1, which can be used as a connection port of the measuring instrument in the line test.

FIG. 3 shows the configuration and operating principle of any one of the longitudinal wavelength reflectors 10-4 to 10-6 of FIG.

A longitudinal wavelength reflector is a wavelength that separates an optical signal output from a fiber grating reflector 22-2 and a fiber grating reflector 22-2 that reflect an optical signal having a set bandwidth, like a sectional wavelength reflector. A multiple / demultiplexer 21 and an antireflective termination port 20-2 for outputting a part of the optical signal separated from the wavelength multiplex / demultiplexer 21 are provided.

Thus, when the monitoring optical signal and the communication optical signal are input, only the specific wavelength component in the monitoring wavelength band is reflected by the fiber grating reflector 22-2, and comes out again to the input side, and the remaining wavelength band components are the wavelength multiplexer / demultiplexer ( 21).

Then, the wavelength multiplexer / demultiplexer 21 divides the wavelength so that the communication wavelength band signal goes to the output side, and the monitoring wavelength band signal goes to the non-reflective termination port 20-2.

Here again, the non-reflective termination port 20-2 may be used as a connection port of the line measuring instrument.

The optical signal for monitoring reflected from the section type wavelength reflector and the longitudinal type wavelength reflector is passed through the wavelength multiplexer / demultiplexer 7-2 and the optical circulator 16 and the wavelength multiplexer / demultiplexer 7-1. ), By connecting the reflected optical power for each section to the optical switch 51, the optical signal for each section is input to the transmission performance measuring apparatus 50 to monitor in real time whether or not all of the optical path failure.

The transmission performance measuring device 50 includes a bit error rate (BER) measuring device to control the computer so that the received optical power and bit error rate values are automatically displayed for each section. It is preferable to inform the operator of a high probability of failure in advance as an alarm for a section having a high probability of occurrence.

Here, the determination of the probability of failure occurrence determines that a failure has occurred when the optical power received at a predetermined bit error rate does not correspond to each section.

The operator recognizes a section with a high probability of failure in the section indicated by the alarm in the transmission performance measuring apparatus 50, and helps the operator and the field personnel check the functional surface and the optical path for the failure prediction section in advance. It implements through the control apparatus 14 of 1, 15-1 to 15-3.

FIG. 4 is a view for explaining the detailed configuration and operation of the control devices 14 and 15-2 of FIG. 1 and the PLC type attenuators 8-1 and 8-3 connected thereto. In addition, the wavelength multiplexing / demultiplexing device ( 7-2), the section type wavelength reflector 10-2 and the terminal type wavelength reflector 10-5 will be described together.

The control devices 14 and 15-2 are optical couplers 30-1 and 30-2 for distributing or coupling optical signals, and photodiodes 31-1 and 31-2 for converting optical power of the optical signals into electrical signals. ), Comparators 32-1 and 32-2 for comparing the voltage of the input signal with a set reference voltage, power supply units 33-1 and 33-2 for supplying power, and external power supply control. Equipped with external power supply buttons 60-1, 60-2.

In addition, the PLC type attenuators 8-1 and 8-3 perform thermo-optic phase shifters 27-1 and 27-2, which perform a switching operation as the temperature increases due to the applied voltage. And optical couplers 26-1 to 26-4.

To check the optical path through the control device 14, 15-2, first, turn on the external power supply buttons 60-1, 60-2 connected to the power devices 33-1, 33-2. Power is supplied to the thermo-optic phase shifters 27-1 and 27-2 of the PLC type attenuators 8-1 and 8-3.

If optical paths 13-7 and 13-13 are the ones with the highest possible probability of failure, then, according to this power supply, the automatic transfer of the optical paths 13-7 and 13-13 to the other optical beams 13-8 and 13-14 Afterwards, check the system functions for the light beams 13-7 and 13-13, eliminate the obstacles in advance, and then turn off the external power supply buttons 60-1, 60-2 to remove the original light 13-13. Switch to 7 and 13-13 to maintain the light beam with high probability of failure.

The operation of the control devices 14, 15-2 and the PLC type attenuators 8-1, 8-3 of FIG. 4 will be described in more detail as follows.

The optical signal RW1 reflected from the section type wavelength reflector 10-2 passes through a PLC type attenuator 8-1, and partly a 99: 1 (1x2) optical coupler 30-1 of the control device 14. The optical power of the reflected optical signal thus input is converted into an electrical signal using the photodiode 31-1.

The signal thus converted is determined by the comparator 32-1 to be equal to or greater than a constant voltage value, and when the voltage value of the monitoring signal is higher than the reference voltage value of the comparator 32-1, the reflected optical signal RW1 is flowing. It is judged that the state of the optical path 13-7 is good.

Of the reflected optical signals RW1, which are not input to the control device 14 via the PLC type attenuator 8-1, the transmission performance measuring device of FIG. 1 is transmitted through the wavelength multiplexing / demultiplexing device 7-2 ( 50).

If the voltage of the signal input to the comparator 32-1 is lower than or equal to a predetermined voltage, that is, if the voltage of the monitoring signal is lower than the reference voltage, it is determined that an external factor is applied to the optical path 13-7 to cause a failure. The power supply device 33-1 supplies power to the thermo-optic phase shifter 27-1 of the PLC type attenuator 8-1.

Heat is then applied to the thermo-optic phase shifter 27-1 to reverse the light transmission rates of the two optical paths 13-7 and 13-8 so that the signal is transmitted through the other optical paths 13-8.                     

Therefore, the optical signal output from the existing telephone station side is transmitted to the subscriber side through the optical paths 13-7 and 13-13, and by recognizing that signal transmission of the optical path 13-7 is impossible due to external factors, LOD 13-7 is automatically switched to 13-8 with other rays, resulting in 13-8 and 13-14.

Due to this optical path change, 99.9% of the signal is transmitted in the optical path 13-7 and 0.1% of the signal is transmitted. In contrast, 0.1% of the signal is transmitted in the optical path 13-8 and 99.9% of the signal is transmitted.

The above operation is similarly performed with respect to RW2, which is another monitoring optical signal reflected by the section type wavelength reflector 10-2.

On the other hand, the monitoring optical signal RW3 reflected from the terminal wavelength reflector 10-5 exits to the section type wavelength reflector 10-2 through the PLC type attenuator 8-3, and part of the optical signal. Is input to the control device 15-2.

Here, the operations of the control device 15-2 and the PLC type attenuator 8-3 are the same as the operations of the control device 14 and the PLC type attenuator 8-1 described above, respectively, and a description thereof will be omitted.

Thus, if it is determined that the optical path 13-13 that is in use is disturbed as a result of the detection of the reflected optical signal RW3, it is switched by the PLC type attenuator 8-3 and the other optical path 13-14. According to the signal transmission is made.

The same operation as described above also works for RW4, which is another monitoring optical signal reflected by the terminal wavelength reflector 10-5.

In addition, in the figure, the optical signal for monitoring reflected by the section type wavelength reflector 10-2 and the terminal type wavelength reflector 10-5 is reflected on both of the dual optical paths (RW1 and RW2, RW3 and RW4). Although shown as being shown, this is shown to explain the general operation of the controllers 14, 15-2 and the PLC type attenuators 8-1, 8-3. have.

The optical signal for monitoring reflected by the section type wavelength reflector 10-2 is detected only by the controller 14, and the optical signal for monitoring reflected by the terminal wavelength reflector 10-5 is controlled by the control device ( Only detected in 15-2).

As such, a part of the signal reflected by each of the wavelength reflectors 10-1 to 10-6 is utilized as an element for detecting the occurrence of a failure in each of the control devices 14, 15-1 to 15-3. Determining whether to automatically switch over, and the remaining reflected signal is transmitted to the transmission performance measuring device 50 to intensively monitor the optical path of the entire optical path section.

This operation is also performed through the section type wavelength reflectors 10-1 and 10-3 and the end type wavelength reflectors 10-4 and 10-6 mounted on the other optical path.

Hereinafter, an example of the automatic optical path switching according to the present invention will be described in detail with reference to FIGS. 5 to 8.

FIG. 5 shows a flow chart of a communication optical signal, a monitoring optical signal, and a reflected optical signal that is actually transmitted. The optical signals are transmitted to subscribers through optical paths 13-7 and 13-13.

The optical signal for monitoring is reflected by the section type wavelength reflector 10-2 and the terminal type wavelength reflector 10-5.

The monitoring optical signal RW5 reflected by the section type wavelength reflector 10-2 is branched at point a and input to the control device 14 and the transmission performance measuring device 50, respectively. The monitoring optical signal RW6 reflected by 10-5) branches at point b and is input to the control device 15-2 and the transmission performance measurement device 50.

If an obstacle occurs at the point A of the optical path 13-7 while the optical signal is flowing in this way, the control device 14 immediately indicates that the power of the optical signal RW5 reflected by the sectional wavelength reflector 10-2 is reduced. It is recognized and is automatically switched by changing the switch state of the PLC type attenuator 8-1 by the operation of the control device 14.

Then, the optical signal flows from 13-8 to 13-14 with light rays as shown in FIG. 6.

The optical path failure can be recognized not only in the section type wavelength reflector 10-2 but also in the transmission performance measuring device 50 in real time by monitoring the transmission performance of each optical path. The recovery of the faulty path takes place immediately and the beams become available again.

If a failure occurs at the point A of the optical path 13-7 and the signal is transmitted to the optical paths 13-8 and 13-14 after the automatic transfer, the failure occurs at the point B of the optical path 13-14. Since there is no power of the optical signal RW7 reflected by the wavelength reflector 10-5, no signal is detected by the control device 15-2 through point c.

The control device 15-2 then applies a voltage of a certain type to the PLC type attenuator 8-3 to automatically switch the optical path, so that the optical signal is transmitted in the optical path 13-13 as shown in FIG. do.

As described above, the monitoring optical signal reflected from the section type wavelength reflector 10-2 is sensed through point a and thus the switching form of the PLC type attenuator 8-1 is changed by the control device 14 accordingly. The optical signal for monitoring reflected from the terminal wavelength reflector 10-5 is detected and is detected through points b and c, thereby switching the PLC type attenuator 8-3 by the control device 15-2. The shape is determined and automatic switching to the light path is achieved.

Table 1 shows the operation of the control device 14 and the PLC type attenuator 8-1 by the reflected monitoring optical signal detected at point a.

TABLE 1

Monitoring optical signal detected at point a Control Unit (14) PLC type attenuator (8-1) One No voltage is applied to the PLC type attenuator (8-1). Keep switching current 0 Applying voltage to PLC type attenuator (8-1) Switch switching

Table 2 shows the operation of the control device 15-2 and the PLC type attenuator 8-3 by the reflected monitoring optical signal detected at points b and c.

TABLE 2

Sensed monitoring light signal Controller (15-2) PLC mode attenuator (8-3) b point c point 0 0 Apply voltage to PLC type attenuator (8-3) Switch switching 0 One No voltage is applied to the PLC type attenuator (8-3) Keep switching current One 0

Here, when the state of the detected monitoring optical signal is 1, a constant optical power of a specified wavelength is detected, and when the state is 0, the optical power is not detected.

That is, when there is no reflected sensing optical signal detected in the optical path, the optical path is switched by switching the PLC type attenuator.

As described above, the present invention has the effect of enabling the prevention and the construction of an efficient monitoring system by monitoring the transmission performance of the optical fiber in real time regardless of the service state of the subscriber at all times.

And even if the transmission performance measuring device monitors the optical path in real time, if there is an unavoidable failure of the optical path, the automatic switching function is accommodated. It can increase the reliability.

Claims (20)

In the optical fiber management system used to transmit an optical signal for communication between a subscriber and a telephone station, A monitoring optical signal transmission device for outputting a monitoring optical signal for monitoring the optical path; A wavelength multiplexing / demultiplexing device for combining the monitoring optical signal with the communication optical signal or separating the combined signal into a monitoring optical signal and a communication optical signal; A section type wavelength reflector installed in a section of the light path to reflect a part of the monitoring optical signal; A longitudinal wavelength reflecting device installed at an end of the subscriber side of the optical path and reflecting a part of the monitoring optical signal; PLC (Planar Light Wave Circuit) type which is connected to the front end of the section type wavelength reflector and the terminal type wavelength reflector, respectively, and automatically converts the optical path to convert the movement path of the communication optical signal and the monitoring optical signal. Attenuator; And A control device connected to the section type wavelength reflector and the terminal wavelength reflector to detect the reflected monitoring optical signal to determine a failure of a light path and to control the PLC type attenuator, The optical path management system, characterized in that the automatic switching of the optical path. The method of claim 1, And a pattern generator for generating a signal of a predetermined pattern and transmitting the signal to the monitoring optical signal transmission device. The method of claim 1, The interval type wavelength reflection value, A first fiber grating reflector reflecting an optical signal having a set bandwidth; An asymmetric optical splitter separating a portion of the optical signal reflected by the first fiber grating reflector; And A first non-reflective termination port for outputting a part of the reflected optical signal separated from the asymmetric optical splitter, Reflects a portion of the monitoring optical signal corresponding to the bandwidth, and outputs the other communication optical signal and the non-reflective monitoring optical signal, and outputs a part of the reflected monitoring optical signal to the first non-reflective termination. Optical fiber management system, characterized in that output to the port. The method of claim 1, The longitudinal wavelength reflection value, A second fiber grating reflector reflecting an optical signal having a set bandwidth; A wavelength multiplexer / demultiplexer for separating the optical signal output from the second fiber grating reflector for each wavelength; And A second antireflection termination port for outputting a part of the optical signal separated by the wavelength multiplexer / demultiplexer, Reflecting a portion corresponding to the bandwidth of the monitoring optical signal, and the other communication optical signal and the non-reflective monitoring optical signal is separated from the wavelength multiplexer / demultiplexer to output a communication optical signal, And the optical signal is output to the second non-reflective termination port. The method of claim 1, The PLC mode attenuator, A plurality of first optical couplers connected to the optical path at an input / output terminal of the optical path passing through the PLC type attenuator to distribute or couple an optical signal; And a thermo-optic phase shifter for changing the path of the optical path when the temperature rises due to an applied voltage. The method according to any one of claims 1 to 5, The control device, A second optical coupler for distributing or coupling the optical signal; A photo diode converting the optical power of the optical signal into an electrical signal; A comparator for comparing the voltage of the input signal with a set reference voltage; A power supply for supplying power; And Equipped with an external power supply button to control the power supply from the outside, When the reflected monitoring optical signal is input through the second optical coupler by pressing the external power supply button, the optical power of the optical signal is converted into an electrical signal, and when the voltage of the changed electrical signal is higher than the reference voltage, the power is supplied. And a device to apply a voltage to a thermo-optic phase shifter to redirect the beam. delete In the optical fiber management system used to transmit an optical signal for communication between a subscriber and a telephone station, A monitoring optical signal transmission device for outputting a monitoring optical signal for monitoring the optical path; A first wavelength multiplexing / demultiplexing device for combining the monitoring optical signal with the communication optical signal or separating the combined signal into a monitoring optical signal and a communication optical signal; A section type wavelength reflector installed in a section of the light path to reflect a part of the monitoring optical signal; A longitudinal wavelength reflecting device installed at an end of the subscriber side of the optical path and reflecting a part of the monitoring optical signal; A transmission performance measuring device for measuring transmission performance to the light beam by using the reflected monitoring optical signal input through an optical switch; The monitoring optical signal output from the monitoring optical signal transmitter is transmitted to the first wavelength multiplexing / demultiplexing device, or the reflected monitoring optical signal transmitted from the first wavelength multiplexing / demultiplexing device is transmitted. An optical circulator for transmitting to a performance measurement device; And A pattern generator for generating a signal of a predetermined pattern and transmitting the signal to the monitoring optical signal transmission device; And measuring transmission performance of the optical path. delete delete delete In the optical fiber management system used to transmit an optical signal for communication between a subscriber and a telephone station, A monitoring optical signal transmission device for outputting a monitoring optical signal for monitoring the optical path; A first wavelength multiplexing / demultiplexing device for combining the monitoring optical signal with the communication optical signal or separating the combined signal into a monitoring optical signal and a communication optical signal; A section type wavelength reflector installed in a section of the light path to reflect a part of the monitoring optical signal; A longitudinal wavelength reflecting device installed at an end of the subscriber side of the optical path and reflecting a part of the monitoring optical signal; A transmission performance measuring device for measuring transmission performance to the light beam by using the reflected monitoring optical signal input through an optical switch; And The monitoring optical signal output from the monitoring optical signal transmitter is transmitted to the first wavelength multiplexing / demultiplexing device, or the reflected monitoring optical signal transmitted from the first wavelength multiplexing / demultiplexing device is transmitted. It is equipped with the optical circulator to transmit to a performance measuring apparatus, The transmission performance measuring device It is possible to control so that the optical power and the bit error rate value of the monitoring optical signal received for each section of the optical path are automatically displayed with a bit error rate measuring device, and an alarm is provided for a section with a high probability of failure. The optical fiber management system characterized by the notification. In the optical fiber management system used to transmit an optical signal for communication between a subscriber and a telephone station, A monitoring optical signal transmission device for outputting a monitoring optical signal for monitoring the optical path; A first wavelength multiplexing / demultiplexing device for combining the monitoring optical signal with the communication optical signal or separating the combined signal into a monitoring optical signal and a communication optical signal; A section type wavelength reflector installed in a section of the light path to reflect a part of the monitoring optical signal; A longitudinal wavelength reflecting device installed at an end of the subscriber side of the optical path and reflecting a part of the monitoring optical signal; A PLC type attenuator connected to the front end of the section type wavelength reflecting device and the terminal type wavelength reflecting device, respectively, to automatically switch the optical path to convert a moving path between the communication optical signal and the monitoring optical signal; A control device connected to the section type wavelength reflector and the terminal type wavelength reflector to detect the reflected monitoring optical signal to determine an obstacle of a light path and to control the PLC type attenuator; A transmission performance measuring device for measuring transmission performance to the light beam by using the reflected monitoring optical signal input through an optical switch; And The monitoring optical signal output from the monitoring optical signal transmitter is transmitted to the first wavelength multiplexing / demultiplexing device, or the reflected monitoring optical signal transmitted from the first wavelength multiplexing / demultiplexing device is transmitted. The optical circulator which transmits to a performance measuring apparatus, And when the failure of the optical path is detected by the transmission performance measuring device, causing the PLC type attenuator to automatically transfer the failed optical path by the control device. The method of claim 13, And a pattern generator for generating a signal of a predetermined pattern and transmitting the signal to the monitoring optical signal transmission device. The method of claim 13, And a second wavelength multiplexing / demultiplexing device for separating the reflected monitoring optical signal transmitted from the optical circulator for each wavelength and transmitting the wavelength to the transmission performance measuring apparatus. The method of claim 13, The interval type wavelength reflection value, A first fiber grating reflector reflecting an optical signal having a set bandwidth; An asymmetric optical splitter separating a portion of the optical signal reflected by the fiber grating reflector; And A second anti-reflective termination port for outputting a part of the reflected optical signal separated from the asymmetric optical splitter, Reflects a portion of the monitoring optical signal corresponding to the bandwidth, and outputs the other communication optical signal and the non-reflective monitoring optical signal, and outputs a part of the reflected monitoring optical signal to the second non-reflective termination. Optical fiber management system, characterized in that output to the port. The method of claim 13, The longitudinal wavelength reflection value, A second fiber grating reflector reflecting an optical signal having a set bandwidth; A wavelength multiplexer / demultiplexer for separating the optical signal output from the second fiber grating reflector for each wavelength; And A second antireflection termination port for outputting a part of the optical signal separated by the wavelength multiplexer / demultiplexer, Reflecting a portion corresponding to the bandwidth of the monitoring optical signal, and the other communication optical signal and the non-reflective monitoring optical signal is separated from the wavelength multiplexer / demultiplexer to output a communication optical signal, And the optical signal is output to the second non-reflective termination port. The method of claim 13, The PLC mode attenuator, A plurality of first optical couplers connected to the optical path at an input / output terminal of the optical path passing through the PLC type attenuator to distribute or couple an optical signal; And a thermo-optic phase shifter for changing the path of the optical path when the temperature rises due to an applied voltage. The method according to claim 13 or 18, The control device, A second optical coupler for distributing or coupling the optical signal; A photo diode converting the optical power of the optical signal into an electrical signal; A comparator for comparing the voltage of the input signal with a set reference voltage; A power supply for supplying power; And Equipped with an external power supply button to control the power supply from the outside, When the reflected monitoring optical signal is input through the second optical coupler by pressing the external power supply button, the optical power of the optical signal is converted into an electrical signal, and when the voltage of the changed electrical signal is higher than the reference voltage, the power is supplied. And a device to apply a voltage to a thermo-optic phase shifter to redirect the beam. The method of claim 13, The transmission performance measuring device, It is possible to control so that the optical power and the bit error rate value of the monitoring optical signal received for each section of the optical path are automatically displayed with a bit error rate measuring device, and an alarm is provided for a section with a high probability of failure. The optical fiber management system characterized by the notification.

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