KR20030087878A - Method and System for Monitoring Optical Core for Use in Optical Communication Network - Google Patents

Abstract

PURPOSE: A system and method for monitoring an optical core in an optical communication network is provided to split an optical signal, transmitted from a remote station, through an optical monitoring unit installed at a base station and to recognize a fault state of an optical core using the level of one of the split optical signals. CONSTITUTION: An optical core monitoring unit(202) consists of a control part(300) and a monitoring part(301). The control part(300) is comprised of a CPU(302), a power converter(304), a clock generator(306), an A/D converter(307), a demultiplexer(308), a programmable flash memory(309), an RS-232C driver(310), a reset button(322), a power switch button(324), RS-232C ports(326,334), and a power input port(332). The monitoring part(301) is comprised of a power supply part(312), a coupler(314), an I/V conversion and low noise amplification part(316), a linear power amplifier(318), a signal level adjuster(320), an adjust button(328), a 7-segment LED(330), an optical signal input port(336), and an optical signal output port(338). The power supply part(312) is supplied power from the power converter(304) of the control part(300) and drives the optical core monitoring unit(202). The coupler(314) splits an optical signal transmitted through an optical core(339) and inputted to the optical signal input port(336). The I/V conversion and low noise amplification part(316) converts a weak optical signal, one of the split signals, received from the coupler(314) into an electric signal, converts the converted signal in the form of voltage, and amplifying the signal component while minimizing the noise loaded on the received signal. The linear power amplifier(318) receives the amplified optical signal and amplifies the linearity of the signal. The signal level adjuster(320) is used to set a threshold for the levels of input optical signals in order to judge whether an optical core has a fault. The adjust button(328) is used to input the threshold. The 7-segment LED(330) digitally displays the level of a received optical signal.

Description

Optical core monitoring system and method in optical communication network {Method and System for Monitoring Optical Core for Use in Optical Communication Network}

The present invention relates to a method and system for monitoring an optical core for use in an optical communication network. More specifically, the optical core monitoring apparatus is installed in the base station to separate the optical signal transmitted from the remote station, and the optical core using the level of the optical signal received as the optical signal having a constant light quantity among the separated optical signals. The present invention relates to a method and system for monitoring an optical core in an optical communication network for recognizing a failure state of a network.

In recent years, communication using mobile phones and the Internet has been rapidly developed toward the transmission of still images and moving pictures beyond the communication of voice or text data, and the commercialization of video conferencing and high-definition television is rapidly progressing. As a result, the demand for high-speed information and communication technology is increasing exponentially. As a result, the demand for communication is rapidly expanding in all areas of society, and the increase of the transmission speed of the communication network to meet this problem has emerged as an urgent problem to be solved.

Conventional communication networks are generally classified into a wired network using a twisted-pair cable, a coaxial cable, and an optical cable using a copper wire and a wireless communication network using a microwave as a transmission medium. However, while wired networks using twisted-pair or coaxial cables have shortcomings of shorter effective transmission distances and narrower transmission bandwidths, wireless networks using microwaves have wider bandwidths than coaxial cables, It is sensitive to changes in the weather environment and weak in information security. In addition, since both methods use electrical methods for switching or signal processing, there is a technical difficulty in satisfying the rapidly increasing demand for communication due to the fundamental disadvantage of limitation in communication speed.

In order to solve these problems, the spread of optical communication networks is rapidly progressing. In Korea and other countries, such as the United States and Japan, investments in connecting base stations with optical cables have already been made as part of such efforts. As the optical cable used in such an optical communication network, a single mode optical fiber mainly made of quartz glass is used.

Fiber optics have much wider bandwidth and lower transmission losses than conventional coaxial cables. For example, a low loss single mode fiber can be used for transmission without a delay of approximately 50 km with a wavelength of 1.3 μm. In addition, since the optical fiber is made of a quartz glass-based material which is a non-metallic material, the optical fiber is not subjected to electromagnetic interference, and no spark occurs due to a short circuit occurring in the case of a coaxial cable.

The optical fiber is composed of a clad part having a small refractive index, a core part having a large refractive index, and a jacket protecting the optical fiber. In other words, the cladding wraps around the core and the jacket wraps around the cladding again. In order to protect mechanically weak optical fibers, two-stage coating is applied, and the primary coating is made of silicon resin, epoxy, urethane, etc. to maintain the strength of the optical fiber wire. . The secondary coating is made of nylon, polyethylene, and the like to reduce the loss due to the microbending of the core portion.

Here, microbending refers to the deviation of the local axis of several micrometers occurring in the optical fiber or the microscopic bending or bending including the spatial wavelength of several millimeters. Micro-bending can occur, for example, during the coating, coating, or packaging or installation of optical fibers, which is responsible for radial loss and mode coupling.

As described above, as the optical network has many advantages over the conventional coaxial cable or microwave, the economic loss due to the failure or failure of equipment and cables caused by the optical network is increasing. Rather, these disruptions can lead to serious problems in society at large. Therefore, systems and methods for monitoring failures or failures occurring in optical communication networks are emerging as very important technologies.

1 is a block diagram schematically illustrating a system for monitoring a failure occurring in a conventional optical communication network.

As shown in FIG. 1, a system for monitoring a failure occurring in a conventional optical communication network is connected to a plurality of remote station optical repeaters 102 and remote station optical repeaters 102 through an optical cable. It comprises a base station optical repeater 105, a network management system (NMS) 106, and an operating station 108 installed in the donor station 104.

The remote station optical repeater 102 receives the optical signal from the base station optical repeater 104 and converts it into an electrical signal. Then, the converted electrical signal is amplified, reproduced, and converted back into an optical signal, and the optical signal is transmitted to another remote station optical repeater 102 or another base station optical repeater through the optical cable. That is, since the optical signal is attenuated in the process of being transmitted along the optical cable, the waveform is attenuated, so an optical repeater is necessary to properly transmit the signal to the destination.

The remote station optical repeater 102 is installed and operated at approximately 10 km intervals when the optical communication network is a system using short wavelengths, and at intervals of about 30 to 40 km when the system uses long wavelengths. In general, an optical repeater uses a light emitting element and a light receiving element for connection between an optical cable and a reproduction relay signal by using a reproduction relay principle used for pulse code modulation (PCM).

The base station optical repeater 105 receives a radio frequency (RF) signal transmitted and transmitted from a wireless communication terminal, converts the received RF signal into an optical signal, and transmits the received RF signal to the remote station optical repeater 102 through an optical cable.

The network management system 106 is a system that monitors all devices on a network in real time and performs monitoring, analysis, and control of each device. Network management system 106 is operated by a single network management protocol (SNMP), the network management information of the network equipment, such as routers, bridges, terminal servers, host computers, etc. This is a standard communication protocol used to transmit to the network management system.

The operating station 108 receives equipment included in the optical communication network from the network management system 106, for example, the status information of the remote station optical repeater 102 or the base station optical repeater 105 to determine whether or not the equipment has failed. It is a function to recover a faulty equipment.

The failure monitoring system of the conventional optical communication network configured as illustrated in FIG. 1 has a disadvantage in that it can only determine whether a failure has occurred in the optical repeater and cannot determine what failure has occurred in which equipment. That is, when the failure of the optical repeater due to the power failure, the disconnection of the optical core or the decrease of the signal level of the optical core due to the micro bending of the optical core, the point where the failure occurs and the cause of the failure cannot be accurately determined.

In addition, the optical core leasing country that leases, maintains, repairs, and manages the optical cores to the telecommunications network operators does not have a separate optical core monitoring device. If a failure due to disconnection or micro bending occurs, the dispatch time for recovery is delayed.

In order to solve the above problems, the present invention, by installing an optical core monitoring device in the base station to separate the optical signal transmitted from the remote station, using the level of the optical signal received as the optical signal of a constant light amount of the separated optical signal The present invention provides a method and system for monitoring an optical core in an optical communication network that recognizes a failure state of the optical core.

1 is a block diagram schematically illustrating a system for monitoring a failure occurring in a conventional optical communication network;

2 is a block diagram schematically illustrating a system for monitoring a failure occurring in an optical communication network according to an embodiment of the present invention;

3 is a block diagram showing the internal and external configuration of an optical core monitoring apparatus according to the present invention;

4 is a block diagram schematically showing how an optical core monitoring apparatus according to an embodiment of the present invention is connected to base station equipment;

5 is a flowchart illustrating a process of monitoring an optical core using an optical core monitoring apparatus according to an exemplary embodiment of the present invention.

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

102: remote station optical repeater 104: base station

105: base station optical repeater 106: network management system

108: operating station 202: optical core monitoring device

300: control unit 301: monitoring unit

306: clock generator 307: A / D converter

308: demultiplexer 310: RS-232C driver

314: coupler 318: linear power amplifier

320: signal level adjusting unit 330: 7 segment LED

402: module unit 406: network management system server

In order to solve the above problems, the present invention provides a device for determining whether or not the optical core failure in the optical communication system in which the optical signal is transmitted and received through the optical core, two optical signals transmitted through the optical core A coupler for branching into a signal, an I / V conversion and a low noise amplifier for converting an optical signal having a small amount of light out of the two optical signals branched from the coupler into an electrical voltage signal and amplifying the voltage signal, the amplified the An A / D conversion unit for converting a voltage signal into digital data, a programmable flash memory unit for converting the digital data into a format suitable for a protocol for a network management system using a predetermined network management system program, and the digital data externally A clock generator for generating a clock of a predetermined frequency band for transmission to the apparatus and the clock; It provides an optical core monitoring apparatus characterized in that it comprises controlling the biological father central processing unit to issue commands for transmitting the digital data to a data communication driver unit.

According to another object of the present invention, in an optical communication system in which an optical signal is transmitted and received through an optical cable, a base station optical repeater installed in a base station for receiving an electrical signal, converting it into an optical signal and transmitting the optical signal through the optical cable, the base station optical repeater A remote station optical repeater which receives the optical signal from the optical signal, converts the signal into an electrical signal, and amplifies the optical signal, and transmits the optical signal back to the optical signal. In the optical communication network comprising an optical core monitoring device for monitoring and an operating station for receiving the monitoring data from the optical core monitoring device through a network management system (network management system) to determine whether the optical core has failed. Provides optical core surveillance system.

According to another object of the present invention, a base station optical repeater for converting an electrical signal into an optical signal, a remote station optical repeater for transmitting the optical signal to another base station optical repeater, an optical core monitoring apparatus for monitoring an optical core and a network management system An optical core monitoring method in which an operating station receiving monitoring data through the optical cable is connected through an optical cable, wherein the optical signal transmitted through the optical cable is input to an optical core monitoring device, and the optical core monitoring device stops the optical signal. Branching into two optical signals, converting and amplifying an optical signal of one of the branched optical signals, measuring a reception level value of the optical signal, and receiving the operation level value through the network management system The optical core monitoring method in an optical communication network comprising the step of transmitting to to provide.

Hereinafter, with reference to the accompanying drawings will be described in detail a preferred embodiment of the present invention.

2 is a block diagram schematically illustrating a system for monitoring a failure occurring in an optical communication network according to an embodiment of the present invention.

Since the same reference numerals in FIG. 1 refer to the same components, detailed descriptions thereof will be omitted.

The system illustrated in FIG. 2 further comprises an optical core monitoring device 202 and an optical cable leasing station 204 in the failure monitoring system described in FIG.

The optical core monitoring device 202 separates an optical signal transmitted from the remote station optical repeater 102 and uses an optical core or an optical repeater through a signal level of an optical signal received with an optical signal having a predetermined light quantity among the separated optical signals. To determine whether a failure has occurred. In FIG. 2, the optical core monitoring device 202 is shown as being installed outside the base station 104, but the optical core monitoring device 202 is usually installed in an optical fiber distribution (OFD) in the base station 104. do. Here, the optical distribution box refers to a device used to connect a jumper code (Jumper Code) connected to the optical cable and the optical communication equipment or another optical cable.

Of course, although not common, the failure of the optical core between the remote station optical repeater 102 and another remote station optical repeater installed in the remote station optical repeater 102 facility, as well as whether the remote station optical repeater 102 itself is broken You will be able to determine. An internal configuration and use example of the optical core monitoring device 202 will be described in more detail with reference to FIGS. 3 to 5.

Optical cable leasing station 204 is connected to the output port (Port) of the network management system 106 server receives the monitoring data from the operating station 108 to check and repair the occurrence of the failure of the optical core leased in real time Function. That is, the operating station 108 processes the monitoring data received from the optical core monitoring device 202 installed in the base station 104 and transmits the data for monitoring to the optical cable leasing station 204 in real time.

Meanwhile, although only one operating station 108 and an optical cable leasing station 204 are shown in FIG. 2, in practice, one or more operating stations 108 and an optical cable leasing station 204 are connected through the network management system 106.

3 is a block diagram showing the internal and external configuration of the optical core monitoring apparatus 202 according to the present invention.

The optical core monitoring apparatus 202 according to the present invention can be largely divided into a control unit 300 and a monitoring unit 301. The control unit 300 includes a central processing unit unit 302, a power conversion unit 304, and a clock generation. Unit 306, A / D converter 307, demultiplexer 308, programmable flash memory 309, RS-232C (Recommended Standard 232 Revision C) driver 310, reset And a (Reset) button 322, a power switch button 324, RS-232C terminals 326 and 334, and a power input terminal 332.

The monitoring unit 301 may include a power supply unit 312, a coupler 314, a current I / V (I / V) conversion and low noise amplifier 316, a linear power amplifier 318, and a signal level adjuster 320. ), An adjust button 328, a seven-segment LED 330, an optical signal input terminal 336, and an optical signal output terminal 338.

First, the components of the control unit 300 will be described. The central processing unit 302 controls the optical core monitoring device 202 as a whole, and in particular, the monitoring data transmitted from the monitoring unit 301 is networked. Transfer to the management system server.

Meanwhile, when the reset button 322 connected to the central processing unit 302 is pressed, the central processing unit 302 is initialized to delete all data previously created or temporarily stored.

The power conversion unit 304 converts the optical power input from the power input terminal 332 into an electrical signal.

The clock generator 306 generates an electric clock signal of a predetermined period using a crystal oscillator, thereby operating time of the central processing unit 302, the programmable flash memory 308, and the RS-232C driver 310. The clock signal for synchronizing the signal is transmitted. The clock signal generated by the clock generator 306 according to the preferred embodiment of the present invention has a frequency of approximately 4 MHz.

The A / D converter 307 converts an analog optical signal transmitted from the signal level adjuster 320 into digital data. That is, at least one optical signal level input to the optical core device by the A / D converter 307 is digitized. That is, by quantifying the level of the received analog optical signal, the operating station 108 or the optical cable leasing station 204 can check the level of the quantized optical signal to determine whether the optical core has failed.

The demultiplxer unit 308 integrates a plurality of digital data digitized by the A / D converter 307 into one channel. The demultiplexer 308 transmits the optical signal level numerically converted into digital data to the 7 segment LED 330 through one channel, and the level of each optical signal is numerically displayed on the 7 segment LED 330.

The programmable flash memory unit 309 stores a program for a network management system for generating a data format used in the network management system server. The program for the network management system includes a number of protocols for the data format used in each optical cable leasing station 204. The programmable flash memory unit 308 receives the quantized optical signal level value from the demultiplexer 308, converts the converted optical signal level into a protocol suitable for transmission in the network management system, and converts the converted data into the central processing unit 302. send.

The RS-232C driver 310 is a driver used for serial communication, and RS-232C is the most common interface used by a computer to transmit and receive data with serial devices such as a modem. The digital data transmitted to the RS-232C driver 310 is transmitted to a computer or network management system server directly connected to the optical core monitoring device 202 along a communication line connected to the RS-232C terminals 326 and 334. The digital data transmitted to the computer or network management system server is transmitted to the operating station 108.

Referring to the monitoring unit 301, the power supply unit 312 receives a power from the power conversion unit 304 of the control unit 300 to drive the optical core monitoring device 202. Meanwhile, the power of the optical core monitoring apparatus 202 may be turned on / off using the power switch 324 of the control unit 300 connected to the power supply unit 312.

The coupler 314 functions to branch an optical signal transmitted through the optical core 339 and input to the optical signal input terminal 336.

In general, couplers are passive components used to branch or couple optical signals. Branching and coupling of electrical signals can be made simply by the mechanical connection of copper wires. However, in the case of optical signals, a special optical element called a coupler is used to reduce the crosstalk of optical signals when the optical fiber cables are coupled.

In addition, the coupler is a splitter for branching one input signal into a plurality of output signals, a tap for branching optical power of the input signal, and a plurality of output signals for a plurality of input signals. Star couplers, and wavelength division multiplexers (WDMs) for splitting optical signals having different wavelengths. In an embodiment of the present invention, a splitter for branching one input signal into a plurality of output signals is used.

The coupler 314 shown in FIG. 3 splits an input optical signal into two optical signals, one of the branched optical signals having a light amount of approximately 95%, which is an optical signal output terminal ( 338 is input to the base station optical repeater 105. The other optical signal has a light amount of approximately 5%, which is transmitted to the I / V conversion and low noise amplifier 316 for measuring the level of the input optical signal before branching.

The I / V conversion and low noise amplifier 316 converts the weak optical signal received from the coupler 314 into an electrical signal for amplification, converts the converted electrical signal into a voltage form, and then receives the received signal. The noise contained in the optical signal is amplified while minimizing the noise. Here, I / V conversion is performed in an I / V converter (not shown), and low noise amplification is performed in a low noise amplifier (LNA) (not shown).

The linear power amplifier 318 receives the optical signal amplified from the I / V conversion and the low noise amplifier 316 and amplifies the linearity of the signal. Here, the reason for linear power amplification of a signal is that in general, an arbitrary input signal passes through many elements, such as an amplifier, to an output. However, most of these devices have nonlinearity, and the nonlinearity causes new frequency components that were not present in the input signal to appear on the output. This phenomenon is called an intermodulation distortion (IMD) phenomenon. Intermodulation on the output side can be catastrophic in digital communications, resulting in linear power amplification to eliminate or minimize intermodulation.

The signal level adjusting unit 320 is used to set the threshold of the reception level of the input optical signal for determining whether the optical core has failed in accordance with the present invention. That is, when the reception level of the input optical signal is measured lower than the threshold set in the signal level adjusting unit 320, it may be determined that a failure has occurred in the optical core. In the embodiment of the present invention, the threshold is set to approximately -4.5 dB, but is not necessarily limited thereto and may be set differently depending on the communication environment.

In addition, according to the present invention, one optical core monitoring apparatus 202 may monitor up to eight optical cores. When monitoring a plurality of optical cores, the signal level adjusting unit 320 is transmitted through each optical core. It also performs a function of allocating a channel to distinguish the input optical signal.

Meanwhile, an adjustment button 328 connected to the signal level adjusting unit 320 is used for an input for setting a threshold.

The seven segment LED 330 is used to determine whether an optical signal is input. That is, the signal level of the optical signal received by the 7-segment LED 330 is displayed in real time as a number, and even when the threshold is set using the adjustment button 328, the threshold set by the 7-segment LED 330 can be confirmed. .

Meanwhile, the optical core monitoring apparatus 202 according to the present invention may further include an optical time domain reflectometer (OTDR).

Here, OTDR analyzes the distance distribution of the amount of light reflected from each point in the longitudinal direction of the optical fiber by injecting optical pulses into the optical fiber, and the loss of the optical signal in the optical fiber, the distance and connection loss to the connection point, the amount of reflection from the connection point, and the optical fiber. It is a measuring instrument for measuring the distance to the point of breakage and the like in case of breakage. The optical signal guiding the optical fiber has a characteristic of reversing backward due to Rayleigh Scattering, scattering and reflection at the break point. By using these characteristics, it is possible to know the point where the crack and the bending of the optical fiber occur, which can be calculated using the following formula.

D = ct / 2n

Where D is the length of the optical fiber, c is the speed of light, t is the round trip time of the input optical pulse, and n is the average refractive index of the core. In general, light travels about 5 ns / m (= 2 × 10 ⁹ m / s) when traveling along the core. Therefore, if only the round trip time t of the input optical pulse is known, the distance of the point where the failure occurs in the optical cable can be known. However, since the OTDR is an expensive device and cannot be provided in all the optical core monitoring devices 202, it may be preferable to selectively provide the OTDR for a long distance optical repeater monitoring device in consideration of cost and efficiency. The OTDR having the above-described function may be connected to the optical signal input terminal 336 of FIG. 3.

4 is a block diagram schematically illustrating how an optical core monitoring apparatus 202 is connected to base station equipment according to an embodiment of the present invention.

The base station optical repeater 105 is composed of a module unit 402 and a power supply unit 404.

Referring to FIG. 2, the module unit 402 converts a high frequency signal received from the mobile communication terminal to the base station 104 into an optical signal and converts the converted optical signal through an optical cable to the remote station optical repeater 102. To send). In addition, the module unit 402 is connected to the network management system server 406 when the failure occurs in the module unit 402, the network management system server 406 will recognize that the failure in the module unit 402 occurs. .

The power supply unit 404 not only supplies power used to drive the base station optical repeater 105, but also supplies power required to drive the optical core monitoring apparatus 202.

The optical core monitoring device 202 is connected to the base station optical repeater 105 through the module unit 402 and is controlled by the base station, and is also connected to the network management system server 406 and connected to the RS-232C terminal 334. The monitoring data generated through the process described in FIG. 3 is transmitted to the network management system server 406 through the serial communication cable.

On the other hand, in general, the wavelength of the optical signal input to the optical core monitoring device 202 through the optical core is 1.30 μm, and the wavelength of the optical signal output is 1.55 μm.

The network management system server 406 is connected to the optical core monitoring unit 202 and the module unit 402 to identify a failure occurring in the optical core using the monitoring data received from the optical core monitoring unit 202, and the module unit The operation state of 402 is monitored to monitor the failure of the base station optical repeater 105. The network management system server 406 transmits failure occurrence information to the operating station 108 when the monitoring data received from the optical core monitoring device 202 or the failure of the base station optical repeater 105 is detected. In addition, the network management system server 406 is supplied with the power required for driving through the BTS rectifier 408.

5 is a flowchart illustrating a process of monitoring an optical core using the optical core monitoring apparatus 202 according to an embodiment of the present invention.

The optical signal transmitted from the remote station optical repeater 102 through the optical core is input to the optical signal input terminal 336 of the optical core monitoring apparatus installed in the base station 104 (S502).

The optical signal input to the optical core monitoring device 202 is branched by the coupler 314 into an optical signal having a light quantity of 5% and an optical signal having a light quantity of 95% (S504).

A signal having a light quantity of 95% of the two optical signals branched by the coupler 314 is input to the base station optical repeater 105 through the optical signal output terminal 338, and a signal having a light quantity of 5% is I / V. The conversion and low noise amplifier 316 is converted and amplified into an analog electric signal and transmitted to the linear power amplifier 318 (S506).

The linear power amplifier 318 amplifies the linearity of the received analog signal and transmits it to the signal level adjuster 320 (S508).

The signal level adjuster 320 allocates a channel for each of one or more analog signals received from the linear power amplifier 318 and transmits the channel to the A / D converter 307 (S510).

The A / D converter 307 converts the received analog signal into digital data and transmits the converted digital data to the demultiplexer 308 (S512).

The demultiplexer 308 receives one or more digital data from the A / D converter 307 and integrates the same into one channel and transmits it to the programmable flash memory unit 309 (S514).

The programmable flash memory unit 309 loads the digital data received from the demultiplexer 308 into the clock signal generated by the clock generator 306 using a predetermined network management system program embedded therein, thereby generating an RS-232C driver. S310 transmits to the computer or network management system server connected to the RS-232C terminal (326, 334) (310) (S516). Here, when it is determined that the digital data received from the RS-232C terminals 326 and 334 is smaller than a preset threshold, the computer creates and stores the received digital data, the reception date and time, etc. as a log file.

Digital data transmitted to the computer or network management system server is transmitted to the operating station 108 of the optical communication system through the communication network (S518). The operating station can confirm the state of the optical core through the received digital data. In other words, if the received digital data value is smaller than the preset threshold (approximately -4.5 db), it means that microbending has occurred in the optical core. If the received digital data value is '0', disconnection has occurred in the optical core or optical communication. It means that a power failure has occurred in the system.

The operating station 108 processes the digital data for monitoring received from the optical core monitoring device 202 into a data format used in each optical cable leasing station, and transmits the processed data to the optical cable leasing station 204. Therefore, the optical cable leasing station 204, which has received the optical core monitoring data from the operating station 108, can determine whether the optical core has failed in real time and quickly recover the failed optical core.

It will be appreciated by those skilled in the art that the present invention is not limited to the above embodiments, and that various modifications and changes can be made without departing from the spirit of the present invention.

As described above, the network management system for monitoring the conventional optical communication system does not monitor the occurrence of the failure of the optical core, but the optical core monitoring apparatus according to the present invention can determine whether the failure of the optical core and the point where the failure occurred in real time There is an advantage.

In addition, since the monitoring data measured by the optical core monitoring device is transmitted to the operating station and the optical cable leasing station in real time, there is an advantage that can quickly recover the optical core or optical repeater that has failed.

Claims (22)

An apparatus for determining whether or not a failure of an optical core in an optical communication system in which an optical signal is transmitted and received through an optical core, A coupler for splitting one optical signal transmitted through the optical core into two optical signals; An I / V conversion and low noise amplifier for converting an optical signal having a small light quantity among the two optical signals branched from the coupler into an electrical voltage signal and amplifying the voltage signal; An analog / digital (A / D) converter for converting the amplified voltage signal into digital data; A programmable flash memory unit for converting the digital data into a format suitable for a protocol for a network management system using a stored network management system program; A clock generator for generating a clock of a predetermined frequency band for transmitting the digital data to an external device; And A central processing unit for controlling the clock generator to issue a command for transmitting the digital data to a data communication driver; Optical core monitoring device comprising a. The method of claim 1, The optical core monitoring apparatus further comprises a linear power amplifier for amplifying the linearity of the optical signal amplified by the I / V conversion and low noise amplifier. The method of claim 1, The optical core monitoring apparatus further comprises a signal level adjusting unit for allocating a channel when the optical signal is one or more and setting a threshold for determining the failure of the optical core. The method of claim 3, wherein And up to eight channels are allocated by the signal level adjusting unit. The method of claim 1, The optical core monitoring apparatus further comprises a demultiplexer which integrates one or more of the digital data converted by the A / D conversion unit into one channel. The method of claim 1, The optical core monitoring apparatus further comprises a seven-segment LED for displaying the digital data in decimal. The method of claim 1, The optical core monitoring apparatus further comprises an optical time domain reflectometer (ODTR) for measuring the failure location of the optical core. The method of claim 1, And the coupler is a splitter for splitting the optical signal into a plurality of signals. The method of claim 1, And said small amount of light corresponds to 5% of the total amount of light of said input optical signal. The method of claim 1, And an optical signal having a larger light quantity among the two optical signals is input to an optical repeater for a base station. The method of claim 1, And the data communication driver is an RS-232C driver for serial communication. In an optical communication system in which an optical signal is transmitted and received through an optical cable, A base station optical repeater installed in a base station for receiving an electrical signal, converting the optical signal into an optical signal, and transmitting the optical signal through an optical cable; A remote station optical repeater which receives the optical signal from the base station optical repeater, converts and amplifies the electrical signal into an electrical signal and transmits the optical signal back to the optical signal; An optical core monitoring device installed in the base station and monitoring whether a failure of the optical core in the optical cable occurs using the reception level of the optical signal; And An operating station that receives the monitoring data from the optical core monitoring device through a network management system and determines whether the optical core has failed. Optical core monitoring system in an optical communication network comprising a. The method of claim 12, The optical core monitoring system further comprises an optical cable leasing station receiving the monitoring data from the operating station. The method of claim 12, And the optical core monitoring apparatus further comprises an ODTR when the base station optical repeater is used to relay long distances. The method of claim 12, And the optical core monitoring apparatus includes an A / D converter to quantify the reception level of the optical signal. Base station optical repeater for converting an electrical signal into an optical signal, remote station optical repeater for transmitting the optical signal to another base station optical repeater, optical core monitoring device for monitoring the optical core and network management system to receive the monitoring data In the optical core monitoring method in an optical communication network in which an operating station is connected through an optical cable, (a) inputting the optical signal transmitted through the optical cable to an optical core monitoring apparatus; (b) the optical core monitoring device splitting the optical signal into two optical signals; (c) converting and amplifying an optical signal of one of the branched optical signals into a voltage; (d) measuring a reception level value of the optical signal; And (e) transmitting the reception level value to the operating station through a network management system; Optical core monitoring method in an optical communication network comprising a. The method of claim 16, And the reception level value is transmitted to a computer installed in a base station connected to the optical core monitoring apparatus through a serial communication cable. The method of claim 17, And the computer stores the reception level value, a corresponding date and time as a file when the reception level value is smaller than a preset threshold. The method of claim 16, The optical core monitoring method further comprises the step of the operating station to change the reception level value to an appropriate format and to transmit to each optical cable leasing station. The method of claim 16, And the optical core monitoring apparatus determines whether a failure of the optical core occurs using the reception level value. The method of claim 16 or 18, And if the reception level value is less than the threshold value, it indicates that microbanding has occurred in the optical core. The method of claim 16, If the reception level value is not measured, the optical core monitoring method in the optical communication network, characterized in that the disconnection or power failure has occurred in the optical core.