KR20090079614A - Optical fiber sensor system using brillouin backscattering, optical ground wire management system including the same, and method for monitoring optical fiber - Google Patents

Abstract

An optical fiber sensor system, and a system and a method for managing an optical ground wire are provided to obtain measurement result at short time and realize a simple frequency control circuit for acquiring a brillouin transition frequency. An optical fiber sensor system(200) includes a light source unit, a branch unit, an optical fiber unit, an optical modulating unit, a reflector, an optical detecting unit and an optical fiber amplifying unit. The light source unit(210) outputs a pulse light having predetermined output level and line width. The branch unit divides the light outputted from the light source unit into a first light and a second light. The optical fiber unit(230) generates a back light. The optical modulating unit(241,242) modulates the divided first light into a pump light and modulates the divided second light into a probe light. A mixed light is created from the modulated pump light and probe light and is outputted to one end of the optical fiber unit. The reflector(250) reflects the mixed light at an end portion of the optical fiber unit. The optical detecting unit(270) detects the back light generated at the optical fiber unit in order to monitor the state of the optical fiber unit. The optical fiber amplifying unit(260) amplifies the mixed light such that the modulated pump light and the modulated probe light should be alternated with time difference.

Description

Optical fiber sensor system using brillouin scattering phenomena, optical fiber composite processing line management system including the same and method thereof optical fiber sensor system using brillouin backscattering, optical ground wire management system including the same, and method for monitoring optical fiber}

The present invention relates to an optical fiber sensor system, an optical fiber composite processing line management system, and a method thereof, and more particularly, an optical fiber capable of extracting state information of the optical fiber by processing a back light generated from the optical fiber using a Brillouin scattering phenomenon. The present invention relates to a sensor system, an optical fiber composite processing line management system, and a method thereof.

Sensors using optical fibers are small and easy to attach to the surface of the object or to bury them in the ground. In addition, since optical fiber is made of glass, it has excellent corrosion resistance and is not affected by electromagnetic waves. In particular, the optical fiber sensor system using Brillouin uses the entire length of the optical fiber as the sensing unit of the sensor. Therefore, only an optical fiber sensor can be in charge of a technique for measuring the distributed physical quantity.

Optical fiber sensors include interference type, wavelength type, and scattering type sensor. Among them, scattering type optical fiber sensor changes according to the physical quantity acting on the outside of the optical fiber by using pulsed light traveling inside the optical fiber which cannot be realized in other types. It is possible to measure the distributed physical quantity of the entire long-distance optical fiber by measuring the back light inside the optical fiber. Such scattering optical fiber sensors include a Rayleigh scattering sensor, a Raman scattering sensor, and a Brillouin scattering sensor, among which an optical fiber Brillouin scattering sensor is used from the outside. According to the Brillouin transition frequency value which is sensitive to both the acting strain and the temperature, the size of the back light is changed, and various distributed physical quantities can be measured.

1 illustrates a schematic configuration of a fiber optic sensor system using a conventional Brillouin scattering phenomenon.

Referring to FIG. 1, the pump light 110 and the probe light 120 are disposed at both ends of the test optical fiber 130 to inject light into the test optical fiber 130, and the pump light 110 and the frequency swept probe light. When the frequency difference of 120 adjusts the optical frequency to match the Brillouin transition frequency difference of the test optical fiber 130, the pump light 110 converts the optical energy into the probe light 120 by induced Brillouin scattering. Accordingly, the probe light 120 amplifies the Brillouin light in the test optical fiber 130. The amplified probe optical signal is converted into an electrical signal by a photodetector PD and the electrical signal is analyzed. However, the conventional optical fiber Brillouin scattering sensor system has a problem in that it takes a very long time to obtain a measurement result. In addition, there is a problem in that it is implemented as expensive equipment by requiring a complex circuit that controls the frequency to obtain the Brillouin transition frequency.

In addition, in the case of a facility related to public interest, such as an optical ground wire (OPGW), even if a system for preventing and managing the disconnection of the optical fiber composite processing wire is needed, the optical fiber composite The management system for managing overhead lines has limitations that apply only to short distances.

The present invention has been made to improve the prior art as described above, the optical fiber sensor system using a Brillouin scattering phenomenon that the time for obtaining a measurement result is short, and the frequency control circuit for acquiring a Brillouin transition frequency is not complicated. An object of the present invention is to provide an optical fiber composite processing line management system and a method thereof.

It is still another object of the present invention to provide an optical fiber sensor system, an optical fiber composite processing line management system, and a method using a Brillouin scattering phenomenon capable of measuring a distributed physical quantity of a long distance optical fiber composite processing land line.

In order to achieve the above object and to solve the problems of the prior art, the present invention is a fiber sensor system using a Brillouin scattering phenomenon, the light source unit for outputting a pulsed light having a predetermined (predetermined) output and a predetermined line width; A branching unit which splits the light output from the light source unit into first light and second light; An optical fiber for generating back light; Modulating the branched first light into pump light, modulating the branched second light into probe light, and generating mixed light from the modulated pump light and the modulated probe light, thereby converting the mixed light into the optical fiber. An optical modulator outputting one end of the light modulator; A reflector reflecting the mixed light at an end of the optical fiber; And a light detector configured to detect a back light generated by the optical fiber and monitor a state of the optical fiber, wherein the optical modulator combines the first light and the second light into a single core to generate the mixed light. An optical fiber sensor system is provided.

In the mixed light of the present invention, the modulated pump light and the modulated probe light alternately proceed with a time difference, and the optical fiber sensor system of the present invention may further include an optical fiber amplifier configured to amplify the mixed light.

The optical modulator of the optical fiber sensor system may further include a signal generator configured to modulate the probe light by sweeping the frequency of the probe light at predetermined intervals, wherein the optical modulator comprises the first light. The pump light is generated by amplitude modulation with a pulse generator signal, and the probe light is generated by modulating the second light with a sine wave, and the frequency of the probe light may be in the range of 10 GHz to 12 GHz.

According to one aspect of the invention, the optical fiber sensor system using a Brillouin scattering phenomenon, the light source unit for outputting pulsed light having a high output line width; A branching part that splits light from the light source part into first light and second light; An optical fiber for generating back light; A first light modulator for modulating the branched first light into pump light; A second light modulator for modulating the branched second light into probe light; Receiving the pump light modulated through the first light modulator and the probe light modulated through the second light modulator, generating mixed light, amplifying the mixed light, and outputting the mixed light to one end of the optical fiber Optical fiber amplifier; A reflector reflecting the mixed light at an end of the optical fiber; And a light detector configured to detect the back light generated by the optical fiber and monitor the state of the optical fiber.

According to another aspect of the present invention, in the optical ground wire (OPGW) management system, by using the Brillouin scattering phenomenon to process the back light generated from the optical fiber of the digitized back light for the optical fiber At least one optical fiber sensor system unit for outputting data; A management server that receives the data for the digitized back light and stores monitoring information including state information about the fiber optic composite processing line; And a central server for receiving and storing the monitoring information from the management server, and controlling and managing the management server, wherein the optical fiber sensor system unit includes pulsed light having a predetermined output and a predetermined line width. A light source unit for outputting; A branching unit which splits the light output from the light source unit into first light and second light; An optical fiber for generating back light; Modulating the branched first light into pump light, modulating the branched second light into probe light, and generating mixed light from the modulated pump light and the modulated probe light to output to one end of the optical fiber. Light modulator; A reflector reflecting the mixed light at an end of the optical fiber; And a light detector configured to detect the back light generated by the optical fiber and monitor a state of the optical fiber.

According to another aspect of the invention, the method for monitoring the state of the optical fiber in the optical fiber sensor system using the Brillouin scattering phenomenon, the branching step of splitting the light output from the light source to the first light and the second light; A light modulator generating mixed light including pump light and probe light from the branched first light and the branched second light; Outputting the mixed light to one end of the optical fiber, and a reflector reflecting the mixed light at the end of the optical island; Detecting a back light by the mixed light incident to the optical fiber and the mixed light reflected through the reflector; And extracting a Brillouin transition frequency of the optical fiber from the back light and processing state information of the optical fiber through the Brillouin transition frequency.

In the optical fiber monitoring method of the present invention, the step of generating the mixed light from the branched first light and the branched second light in the optical modulator, modulating the branched first light into the pump light, And modulating the branched second light into the probe light and generating mixed light from the modulated pump light and the modulated probe light.

According to the present invention, there is provided an optical fiber sensor system, an optical fiber composite processing line management system, and a method using a Brillouin scattering phenomenon in which a time for obtaining a measurement result is short and a frequency control circuit for obtaining a Brillouin transition frequency is not complicated. do.

According to the present invention, there is provided an optical fiber sensor system, an optical fiber composite processing line management system, and a method using a Brillouin scattering phenomenon capable of measuring a distributed physical quantity of a long distance optical fiber composite processing land line.

Hereinafter, an optical fiber sensor system, an optical fiber composite processing line management system, and a method using a Brillouin scattering phenomenon according to the present invention will be described in detail with reference to the accompanying drawings. In describing the present invention, when it is determined that detailed descriptions of related known functions or configurations may unnecessarily obscure the subject matter of the present invention, the detailed description thereof will be omitted. Terminology used herein is a term used to properly express a preferred embodiment of the present invention, which may vary according to a user, an operator's intention, or a custom in the field to which the present invention belongs. Therefore, the definitions of the terms should be made based on the contents throughout the specification.

2 is a block diagram illustrating components of an optical fiber sensor system according to an exemplary embodiment of the present invention.

Brillouin scattering of an optical fiber is a phenomenon in which light interacts with sound waves generated in a material and scatters at a frequency different from that of incident light. The difference between these frequencies is called a Brillouin transition frequency change, and the frequency is highly dependent on the material of the optical fiber. In addition, it varies depending on the strain applied to the optical fiber. The optical fiber sensor system of the present invention measures the distributed physical quantity and temperature of the optical fiber that can be acquired at the Brillouin transition frequency change using the Brillouin scattering phenomenon described above.

2, the optical fiber sensor system 200 of the present invention includes a light source unit 210, a branch unit 220, an optical fiber 230, an optical modulator 240, a reflector 250, and a photodetector unit. 270.

The light source unit 210 outputs pulsed light having a predetermined output and a predetermined line width, and the branch unit 220 splits the light output from the light source unit 210 into the first light and the second light. The light source unit 210 may be a laser diode LD, and the laser diode may emit pulsed light having a predetermined line width of high power.

The light modulator 240 modulates the branched first light into pump light, modulates the branched second light into probe light, and generates mixed light from the modulated pump light and the modulated probe light. Output to one end of the optical fiber 230. The mixed light will be described with reference to FIG. 7. FIG. 7 illustrates light output of mixed light including pump light and probe light according to an embodiment of the present invention. Referring to FIG. 7, the mixed light includes the modulated pump light and the modulated probe. Light alternates with time difference. In detail, the light modulator 240 amplitude-modulates the first light into a pulse generator signal to generate the pump light, and modulates the second light into a sine wave to generate the probe light. That is, the mixed light is light in which the pump light and the probe light alternately travel together with a time difference. The modulated pump light and the modulated probe light alternately proceed in two senses. First, the probe light travels and the pump light travels in an impulse. This includes all cases where the pump light alternates with time. The optical modulator 240 may further include a signal generator 243 for modulating the probe light by sweeping the frequency of the probe light at predetermined intervals. The signal generator 243 is operated by sweeping and increasing the frequency at a predetermined interval in a predetermined frequency range selected to obtain a Brillouin scattering amplification to generate a Brillouin scattering amplification, and the probe light frequency may be in the range of 10 GHz to 12 GHz. . In addition, the optical fiber sensor system 200 of the present invention may further include an optical fiber amplifier 260 for amplifying the mixed light.

Referring back to FIG. 2, the optical fiber 230 is an optical fiber that generates a back light while the mixed light amplified through the optical fiber amplifier 260 proceeds.

The reflector 250 reflects the mixed light output from the end of the optical fiber 230 back to the optical fiber 230. The reflected mixed light and the mixed light output through the optical fiber amplifier 260 to one end of the optical fiber 230 collide with each other to generate rear light. The reflector 250 may be a fiber bragg grating (FBG) that allows the pump light to pass through and reflects the probe light. In addition, the reflector 250 may be a mirror that reflects both the pump light and the probe light. In other words, the reflected probe light and the advancing pump light propagate in opposite directions in the optical fiber to generate induced Brillouin scattering.

The FBG has a band reflection characteristic capable of reflecting only probe light, and has a bandwidth of 40 pm. In addition, the FBG is sufficient when the FBG having a large reflection bandwidth passes at the pump wavelength and is reflected at the probe wavelength, that is, the rise of the reflection coefficient curve with respect to the wavelength is within 10 GHz, and the wavelength of the pump light is sufficient. And may be applied if it is generated between the wavelength of the probe light. In addition, the scanning of the wavelength of the probe light is performed within several hundred MHz, and when the reflectance of the FBG is not uniform within the wavelength range of the probe light, induced Brillouin scattering is caused by the wavelength difference between the pump light and the probe light. Since the wavelength of the probe light is fixed, the wavelength of the pump light may be scanned.

The light detector 270 monitors the state of the optical fiber 230 by sensing the back light generated from the optical fiber 230. To this end, the light detector 270 includes an optical circulator 271 for branching back light generated from the optical fiber 230, a detector 272 for converting the branched back light signal into back light signal data, and the back light signal. And a signal processor 273 for extracting a Brillouin transition frequency of the optical fiber 230 from the data and processing state information of the optical fiber 230 through the Brillouin transition frequency. The detector 272 senses the branched back light by sampling and averaging at a predetermined period. The optical circulator 271 does not branch the pump light from the mixed light output from the light modulator 240, and splits scattering, that is, a back light generated in a direction opposite to the advancing direction of the mixed light by the pump light, to detect the detector 272. ) In addition, the signal processor 273 controls the overall operation of the optical fiber sensor system 200 of the present invention according to the selected basic variable, for example, the number of averaging, the number of sampling and the speed, the frequency irradiation range, and the sweeping step frequency. It receives the data about the back light which can be sampled and digitally processed at a certain period from 272 and outputs a signal of the length of the optical fiber and the change of the Brillouin transition frequency. That is, the light detector 270 detects the back light generated from the optical fiber 230 at a preset sampling frequency, and outputs the detected back light signal as a digital signal by A / D conversion.

In this case, the state information includes distributed physical quantity information such as strain of the optical fiber 230, and temperature information of the optical fiber 230.

The optical fiber sensor system 200 of the present invention does not sense the back light generated when the pump light and the probe light are incident on different ends of the optical fiber, and branch the light output from the light source unit 210 into the pump light and the probe light. Then, it receives the modulated pump light and the modulated probe light as a single core, and generates a mixed light to the mixed light incident on one end of the optical fiber 230 and the mixed light reflected through the reflector 250 By detecting the back light. The reflector 250 may be a fiber bragg grating (FBG) that allows the pump light to pass through and reflects the probe light.

This makes it possible to provide an optical fiber sensor system using Brillouin scattering which has a short time for obtaining measurement results and a complex frequency control circuit for acquiring a Brillouin transition frequency. The physical quantity can be measured.

3 is a block diagram illustrating components of an optical fiber sensor system according to another exemplary embodiment of the present invention.

Referring to FIG. 3, the optical fiber sensor system 200 according to another embodiment of the present invention includes a light source unit 210 that outputs pulsed light having a high output line width, and light from the light source unit 210. A branch 220 for splitting into two lights, an optical fiber 230 for generating a back light, a first light modulator 241 for modulating the split first light into a pump light, and probes the split second light. The mixed light is received by receiving the second light modulator 242 that modulates the light, the pump light modulated by the first light modulator 241, and the probe light modulated by the second light modulator 242. An optical fiber amplifier 260 for generating and amplifying the mixed light and outputting the mixed light to one end of the optical fiber, a reflector 250 for reflecting the mixed light at an end of the optical fiber 230, and an optical fiber 230 A photodetector 270 that detects the back light generated from the monitor and monitors the state of the optical fiber 230. It is.

Since the components of the optical fiber sensor system of FIG. 3 are identical except for the optical modulator 240 of the optical fiber sensor system 200 of FIG. 2, detailed description thereof will be omitted. The optical fiber sensor system 200 according to another embodiment of the present invention splits the light output from the light source unit 210 into the first light and the second light through the branch unit 220, and splits the branched first light. A first light modulator 241 for modulating pump light and a second light modulator 242 for modulating the branched second light into probe light, and converting the pump light and the probe light into mixed light. Create The first light modulator generates the pump light by amplitude-modulating the first light into a pulse generator signal, and the second light modulator modulates the second light into a sine wave to generate the probe light. The optical fiber sensor system 200 does not sense the back light generated when the pump light and the probe light are incident to different ends of the optical fiber, and branch the light output from the light source unit 210 into the pump light and the probe light. The modulated pump light and the modulated probe light are received as a single core, and mixed light is generated to generate mixed light and back light by the mixed light reflected through the reflector 250 and the mixed light incident on one end of the optical fiber 230. The light detector 270 detects the back light generated from the optical fiber 230 at a preset sampling frequency, and outputs the detected back light signal as a digital signal by A / D conversion.

FIG. 4 is a view illustrating an optical ground wire (OPGW) management system according to an embodiment of the present invention.

Referring to FIG. 4, the optical fiber composite processing line management system of the present invention includes an optical fiber sensor system unit 200, a management server 300, and a central server 400.

The optical fiber sensor system unit 200 processes the back light generated from the optical fiber by using a Brillouin scattering phenomenon to output data of the digitized back light for the optical fiber. The optical fiber composite processing ground line may be formed of one or more due to a geographical or functional location, and thus, the optical fiber sensor system unit 200 may also be formed of one or more. The optical fiber composite processing ground wire is an optical fiber composite processing ground wire which has a fiber optic cable embedded in a processing ground line installed above the transmission tower in order to protect the transmission line from lightning strikes, and serves as an information communication function. It is a cable that adds optical signal transmission function by embedding optical fiber in overhead wire. In addition, as described above, the optical fiber sensor system unit 200 includes a light source unit for outputting pulsed light having a predetermined output and a predetermined line width, and the light output from the light source unit as the first light and the second light. A diverging branch, an optical fiber for generating back light, modulating the branched first light into pump light, modulating the branched second light into probe light, from the modulated pump light and the modulated probe light An optical modulator for generating mixed light and outputting the mixed light to one end of the optical fiber, a reflector reflecting the mixed light at an end of the optical fiber, and a light detector for detecting a state of the rear light generated by the optical fiber to monitor the state of the optical fiber Include.

The management server 300 receives the data for the digitized back light and stores the monitoring information including the state information for the optical fiber composite processing line. In addition, the monitoring information including the status information is transmitted to the central server 400 so that the central server 400 can comprehensively manage the optical fiber composite processing line.

The central server 400 receives the monitoring information including the status information from the management server 300, stores the monitoring information, and controls and manages the management server 300. In addition, the central server 400 may further include a database (not shown) for storing the monitoring information. By monitoring the optical fiber composite processing line information distributed physical quantity information of the optical fiber composite processing line management system described above, it is possible to prevent the disconnection of the transmission line related to the public interest in advance. That is, when an error occurs in the transmission line above a certain threshold value set in the optical fiber composite processing line management system, disconnection accident can be prevented due to the monitoring information.

5 is a flowchart illustrating a method of monitoring a state of an optical fiber in an optical fiber sensor system using a Brillouin scattering phenomenon according to an embodiment of the present invention.

Referring to FIG. 5, first, the branching unit splits the light output from the light source unit into the first light and the second light (step S510). Thereafter, the light modulator generates mixed light including pump light and probe light from the branched first light and the branched second light (step S520). Specifically, modulate the branched first light into the pump light, modulate the branched second light into the probe light, and generate mixed light from the modulated pump light and the modulated probe light. Further, the probe light is modulated by sweeping the frequency of the probe light at predetermined intervals. Next, the mixed light is output to one end of the optical fiber, and a reflector reflects the mixed light at the end of the optical fiber (step S530). Next, the photodetector detects the back light due to the mixed light incident to the optical fiber and the mixed light reflected through the reflector (step S540). At this time, the branched back light is detected by sampling at a predetermined period. The Brillouin transition frequency of the optical fiber is extracted from the back light, and the state information of the optical fiber is processed through the Brillouin transition frequency (step S550). That is, the monitoring method of the present invention does not sense the back light generated when the pump light and the probe light are incident on different ends of the optical fiber, and splits the light output from the light source into the pump light and the probe light, and modulates it. Receives the pump light and the modulated probe light as a single core, generates a mixed light to detect the back light by the mixed light incident on one end of the optical fiber and the mixed light reflected through the reflector, the light detector The sensor detects the back light generated from the optical fiber at the preset sampling frequency, and A / D converts it to output the detected back light signal as a digital signal to monitor the state of the optical fiber.

6 is a flowchart illustrating a method of managing an optical fiber composite processing line in the optical fiber composite processing line management system according to the present invention.

Referring to FIG. 6, the optical fiber sensor system transmits data regarding state information of a line to a management server (step S610). Thereafter, the management server receives and analyzes the data to determine whether the data exceeds a predetermined threshold (step S620), and when the data exceeds a threshold acceptable to the optical fiber composite processing line (step S620). At step S630, the manager warns that there is an abnormal track (step S640), and the management server transmits the data and the warning information to the central server (step S650). The central server receives the data or the alert information and stores it in a database (step S660). On the other hand, if the management server receives and analyzes the data to determine whether the data exceeds a predetermined threshold (step S620), and the data does not exceed the threshold acceptable to the optical fiber composite processing line. In step S630, the management server transmits the data to the central server, and the central server receives and stores the data in a database (step S660).

The optical fiber condition monitoring method and the optical fiber composite processing line management method according to the present invention can be implemented in the form of program instructions that can be executed by various computer means and recorded in a computer readable medium. The computer readable medium may include program instructions, data files, data structures, etc. alone or in combination. Program instructions recorded on the media may be those specially designed and constructed for the purposes of the present invention, or they may be of the kind well-known and available to those having skill in the computer software arts. Examples of computer-readable recording media include magnetic media such as hard disks, floppy disks and magnetic tape, optical media such as CD-ROMs, DVDs, and magnetic disks such as floppy disks. Magneto-optical media, and hardware devices specifically configured to store and execute program instructions, such as ROM, RAM, flash memory, and the like. The medium may be a transmission medium such as an optical or metal line, a waveguide, or the like including a carrier wave for transmitting a signal specifying a program command, a data structure, or the like. Examples of program instructions include not only machine code generated by a compiler, but also high-level language code that can be executed by a computer using an interpreter or the like. The hardware device described above may be configured to operate as one or more software layers to perform the operations of the present invention, and vice versa.

As described above, the present invention has been described by way of limited embodiments and drawings, but the present invention is not limited to the above-described embodiments, which can be variously modified and modified by those skilled in the art to which the present invention pertains. Modifications are possible. Accordingly, the spirit of the present invention should be understood only by the claims set forth below, and all equivalent or equivalent modifications thereof will belong to the scope of the present invention.

1 illustrates a schematic configuration of a fiber optic sensor system using a conventional Brillouin scattering phenomenon.

2 is a block diagram illustrating components of an optical fiber sensor system according to an exemplary embodiment of the present invention.

3 is a block diagram illustrating components of an optical fiber sensor system according to another exemplary embodiment of the present invention.

FIG. 4 is a view illustrating an optical ground wire (OPGW) management system according to an embodiment of the present invention.

5 is a flowchart illustrating a method of monitoring a state of an optical fiber in an optical fiber sensor system using a Brillouin scattering phenomenon according to an embodiment of the present invention.

6 is a flowchart illustrating a method of managing an optical fiber composite processing line in the optical fiber composite processing line management system according to the present invention.

FIG. 7 illustrates light output of mixed light including pump light and probe light according to an embodiment of the present invention.

<Explanation of symbols for the main parts of the drawings>

210: light source portion 220: branch portion

230: optical fiber 240: light modulator

241: first light modulator 242: second light modulator

243: signal generator 250: reflector

260: optical fiber amplifier 270: light detector

271: optical circulator 272: detector

273: signal processor 300: management server

400: central server

Claims (12)

In the optical fiber sensor system using Brillouin scattering phenomenon, A light source unit for outputting pulsed light having a predetermined output and a predetermined line width; A branching unit which splits the light output from the light source unit into first light and second light; An optical fiber for generating back light; Modulating the branched first light into pump light, modulating the branched second light into probe light, and generating mixed light from the modulated pump light and the modulated probe light, thereby converting the mixed light into the optical fiber. An optical modulator outputting one end of the light modulator; A reflector reflecting the mixed light at an end of the optical fiber; A light detector for sensing a state of the optical fiber by sensing the back light generated from the optical fiber; And An optical fiber amplifier configured to amplify the mixed light in which the modulated pump light and the modulated probe light alternate with time, And the optical modulator is configured to combine the first light and the second light into a single core to generate the mixed light. The method of claim 1, The optical modulator And modulating the first light into a pulse generator signal to generate the pump light, and modulating the second light into a sine wave to generate the probe light. The method of claim 1, The optical modulator And a signal generator for modulating the probe light by sweeping the frequency of the probe light at predetermined intervals. The method of claim 1, The light detector, An optical circulator for branching back light generated from the optical fiber; A detector for detecting the branched back light and converting the detected back light signal into back light signal data And a signal processor extracting a Brillouin transition frequency of the optical fiber from the back light signal data and processing state information of the optical fiber through the Brillouin transition frequency. The method of claim 4, wherein And the detector detects the branched back light by sampling at a predetermined period. The method of claim 4, wherein The state information includes distribution type physical quantity information of the optical fiber, and temperature information of the optical fiber. The method of claim 1, The reflector is a fiber bragg grating (FBG), the pump light passes, and the probe light, characterized in that for reflecting the probe light. In the optical fiber sensor system using Brillouin scattering phenomenon, A light source unit for outputting pulsed light having a high output line width; A branching part that splits light from the light source part into first light and second light; An optical fiber for generating back light; A first light modulator for amplitude-modulating the branched first light into a pulse generator signal to generate the pump light; A second light modulator for generating the probe light by modulating the branched second light into a sinusoidal wave; Receives the pump light modulated through the first light modulator and the probe light modulated through the second light modulator, generates mixed light, amplifies the mixed light, and converts the mixed light into one end of the optical fiber. An optical fiber amplifier for outputting; A reflector reflecting the mixed light at an end of the optical fiber; And And a light detector configured to detect the back light generated by the optical fiber and monitor a state of the optical fiber. The method of claim 8, The second optical modulator And a signal generator for modulating the probe light by sweeping the frequency of the probe light at predetermined intervals. The method of claim 8, The light detector, An optical circulator for branching back light generated from the optical fiber; A detector for sampling and branching the branched back light at a predetermined period and converting the detected back light signal into back light signal data; And And a signal processor extracting a Brillouin transition frequency of the optical fiber from the back light signal data and processing state information of the optical fiber through the Brillouin transition frequency. In the optical fiber ground (OPGW) management system, At least one optical fiber sensor system unit for processing the back light generated from the optical fiber by using a Brillouin scattering phenomenon to output data of the digitized back light for the optical fiber; A management server that receives the data for the digitized back light and stores monitoring information including state information about the fiber optic composite processing line; And Receiving and storing the monitoring information from the management server, including a central server for controlling and managing the management server, The optical fiber sensor system unit, A light source unit for outputting pulsed light having a predetermined output and a predetermined line width; A branching unit which splits the light output from the light source unit into first light and second light; An optical fiber for generating back light; Modulating the branched first light into pump light, modulating the branched second light into probe light, and generating mixed light from the modulated pump light and the modulated probe light to output to one end of the optical fiber. Light modulator; A reflector reflecting the mixed light at an end of the optical fiber; And And a light detecting unit configured to detect a back light generated from the optical fiber and monitor a state of the optical fiber. The method of claim 11, The central server further comprises a database for storing the monitoring information optical fiber composite processing line management system.

Images