KR100307319B1 - Optical subscriber line monitoring and testing apparatus - Google Patents

Abstract

1. TECHNICAL FIELD OF THE INVENTION

The present invention relates to an optical subscriber line monitoring and testing device.

2. The problem to be solved by the invention

It is an object of the present invention to provide an optical subscriber line monitoring and testing device capable of accurately classifying and monitoring line failure sections and line failure devices by distinguishing each of the line sections and the line devices with characteristic optical wavelength parameters. .

3. Summary of Solution to Invention

An optical subscriber line monitoring and testing apparatus for monitoring and testing an optical path section between a telephone station and a subscriber side, comprising: monitoring optical signal generating means for generating an optical signal for monitoring the optical path section; The monitoring optical signal generated from the monitoring optical signal generating means and the first communication optical signal transmitted from the telephone station side are multiplexed, the second communication optical signal transmitted from the subscriber side, and the monitoring optical signal reflected and transmitted. Multiplexing and demultiplexing means for separating the; Light reflection and distribution means for distributing the communication optical signal after reflecting the monitoring optical signal in the monitoring wavelength band from the first communication optical signal multiplexed by the multiplexing and demultiplexing means to the multiplexing and demultiplexing means ; A plurality of first light reflecting means for transmitting only the communication optical signal in the communication wavelength band to the subscriber side in the optical signal distributed by the light reflection and distribution means, and reflecting the optical signal outside the communication wavelength band to the outside; Optical circulation means for transmitting the optical signal generated from the monitoring optical signal generating means to the light reflection and distribution means and for transmitting the monitoring optical signal demultiplexed by the multiplexing and demultiplexing means to the demultiplexing means; ; Demultiplexing means for demultiplexing the monitoring optical signal separated by the multiplexing and demultiplexing means for each wavelength; And reflected light receiving means for receiving the monitoring optical signal demultiplexed by the demultiplexing means.

4. Important uses of the invention

The present invention is used to monitor the optical path section between the telephone station and subscriber side.

Description

Optical subscriber line monitoring and testing device {OPTICAL SUBSCRIBER LINE MONITORING AND TESTING APPARATUS}

The present invention relates to a service-free optical subscriber line monitoring and testing device, and in particular, an optical subscriber line monitoring that can test a line facility without affecting the communication of subscribers even during service while always intensively monitoring the optical subscriber line in the telephone station. And a test apparatus.

In general, in the presently proposed or in use optical subscriber system, a method capable of monitoring and testing such as the present invention is not considered, or information is exchanged between the telephone station communication apparatus and the subscriber terminal using the overhead of the communication protocol. It recognizes a communication failure.

However, the method of using the overhead of the communication protocol is not only limited to the digital transmission method, but also is not available when monitoring or testing the performance of the line itself and when the subscriber station is at rest.

1 is an explanatory diagram of a conventional distribution type and broadcast type optical subscriber system, in which a signal output from the optical communication transmitting and receiving device 10 is inserted into each optical line section 11 to 23. ), The optical power is distributed and input to the optical communication transceivers 28 to 36 located at the subscriber side of the final stage.

In the conventional optical subscriber system having such a structure, the optical path monitoring and test method is not implemented, or the communication status is checked using the overhead of the communication protocol between the communication transceiver between the telephone station and the subscriber optical communication transceiver.

However, the conventional optical subscriber system as described above has the following problems.

First, when there is no line monitoring / testing function when a line failure occurs, the subscriber must report a failure to know the line failure.In the method of using information exchange by protocol on the communication channel, the subscriber and the telephone station are communicating. If not, there was a problem that it was impossible to know beforehand even if a line failure occurred.

Second, when a failure test is not recognized from the beginning when a line failure is recognized and a test for maintenance is performed, it takes a lot of time because it is necessary to find out the failure point in the corresponding section after conducting a test to detect the failure section. There was this.

Third, the test should be performed by separating the connection between the optical distribution device and the optical path according to the test case. At this time, there is a problem in that the service through all optical path sections connected to the optical distribution device under test is interrupted.

Therefore, the present invention has been proposed to solve the above problems, and the monitoring of the wire facilities without affecting the communication of subscribers during the service, while always intensively monitoring the optical subscriber line in the telephone station, and each line section and line device Can be classified and distinguished by the characteristic optical wavelength parameter to accurately monitor and test the line fault section and the line fault device. Also, by using passive elements to monitor and test the optical subscriber line, power for driving the device is required. The purpose is to provide an optical subscriber line monitoring and testing device that can significantly increase the stability of the system.

1 is an explanatory diagram of a conventional optical subscriber system.

Figure 2 is an embodiment configuration of the optical subscriber line monitoring and testing apparatus according to the present invention.

3A is a diagram illustrating an embodiment of the section light reflector of FIG. 2.

FIG. 3B is a diagram illustrating an embodiment of the longitudinal light reflecting unit of FIG. 2; FIG.

Explanation of symbols on the main parts of the drawings

211: optical signal generator for monitoring 212: optical transmitter and receiver

213: multiplexing and demultiplexing section 214, 216, 217, 218: section light reflecting section

215, 219, 220, 221: light distribution section 222, 223, 224: vertical light reflection section

225, 226, 227: subscriber's optical transceiver 228: demultiplexer

229: reflected light receiver

The present invention for achieving the above object, in the optical subscriber line monitoring and testing apparatus for monitoring and testing the optical path section between the telephone station and subscriber side, for monitoring for generating the optical signal for monitoring the optical path section Optical signal generating means; The monitoring optical signal generated from the monitoring optical signal generating means and the first communication optical signal transmitted from the telephone station side are multiplexed, the second communication optical signal transmitted from the subscriber side, and the monitoring optical signal reflected and transmitted. Multiplexing and demultiplexing means for separating the; Light reflection and distribution means for distributing the communication optical signal after reflecting the monitoring optical signal in the monitoring wavelength band from the first communication optical signal multiplexed by the multiplexing and demultiplexing means to the multiplexing and demultiplexing means ; A plurality of first light reflecting means for transmitting only the communication optical signal in the communication wavelength band to the subscriber side in the optical signal distributed by the light reflection and distribution means, and reflecting the optical signal outside the communication wavelength band to the outside; Optical circulation means for transmitting the optical signal generated from the monitoring optical signal generating means to the light reflection and distribution means and for transmitting the monitoring optical signal demultiplexed by the multiplexing and demultiplexing means to the demultiplexing means; ; Demultiplexing means for demultiplexing the monitoring optical signal separated by the multiplexing and demultiplexing means for each wavelength; And reflected light receiving means for receiving the monitoring optical signal demultiplexed by the demultiplexing means.

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

2 is a block diagram of an embodiment of an optical subscriber line monitoring and testing apparatus according to the present invention.

As shown in FIG. 2, the optical subscriber line monitoring and testing apparatus of the present invention includes a monitoring optical signal generator 211 for generating a monitoring optical signal for monitoring a light path section, and a communication optical signal. Optical transmission and reception unit 212 for transmitting to the side and receiving the optical signal for communication transmitted from the subscriber side, the monitoring optical signal generated from the optical signal generator 211 for monitoring and the communication light transmitted from the optical transmission and reception unit 212 Multiplexed by the multiplexing and demultiplexing unit 213 and the multiplexing and demultiplexing unit 213 for multiplexing a signal, separating and transmitting a communication optical signal transmitted from the subscriber side and a monitoring optical signal reflected and transmitted. Distributing the optical signal transmitted from the optical signal from the section light reflecting section 214 and the section light reflecting section 214 for reflecting the light signal for monitoring in the monitoring wavelength band to the multiplexing and demultiplexing section 213 in the optical signal Above Section light reflecting unit 216 for reflecting the optical signal for monitoring in the wavelength band for monitoring to the multiplexing and demultiplexing unit 213 in the optical distribution unit 215 and the optical signal distributed and transmitted by the optical distribution unit 215 , 217, 218, light distribution units 219, 220, 221 for distributing optical signals correspondingly transmitted from the section light reflecting units 216, 217, 218, and light distribution 220 Terminated light reflection parts 222, 223, and 224 which transmit only the communication optical signal in the communication wavelength band to the subscriber side in the optical signal transmitted from the optical signal, and reflect the optical signal outside the communication wavelength band to the outside through the anti-reflective port; Receiving demultiplexing unit 228 for demultiplexing the monitoring optical signal separated by the multiplexing and demultiplexing unit 213 for each wavelength, and receiving the demultiplexing monitoring optical signal by the demultiplexing unit 228 From the reflected light receiver 229 and the monitoring optical signal generator 211 a The monitoring optical signal transmitted through the port is transmitted to the multiplexing and demultiplexing unit 213 through the b port, and the monitoring optical signal transmitted through the b port from the multiplexing and demultiplexing unit 213 through the c port. The optical circulator 230 delivers the demultiplexer 228.

Here, the wavelength band of the light source used for the optical signal generator 211 for monitoring should be different from the wavelength band of the light source used for the light transmitting / receiving unit 212, and the wavelength band used for all the section light reflecting units 214 to be used in the system. , 216, 217, and 218 and the reflected wavelength bandwidth of the longitudinal light reflectors 222, 223, and 224.

The operation of the optical subscriber line monitoring and testing apparatus of the present invention having the structure as described above will be described in detail as follows.

The light source of the monitoring optical signal generator 211 uses a wavelength band different from the wavelength band used by the optical transmitter / receiver 212 while operating as a continuous wave (CW).

The wavelength line width of the light source is wider than the sum of the reflection wavelength bandwidths of the sectioned light reflection parts 214, 216, 217, and 218 and the longitudinal light reflection parts 222, 223, and 224.

The monitoring optical signal output from the monitoring optical signal generator 211 is input to the a port of the optical circulator 230 and then output to the b port so that the multiplexing and demultiplexing unit 213 of the next stage transmits to the telephone station side. Multiplexed with the communication optical signal output from the unit 212 is input to the optical path section.

The section light reflecting units 214, 216, 217, and 218 reflect only a predetermined fiber grating reflection wavelength and pass the remaining wavelength components to pass through the light distribution units 215, 219, 220, and 221, respectively. To pass.

Each of the optical signals passing through the light distribution units 219, 220, and 221 is transmitted to the longitudinal light reflection units 222, 223, and 224, and likewise, only a predetermined fiber grating reflection wavelength is reflected. The remaining wavelength components are the non-reflected wavelength components and the communication wavelength components among the components of the monitoring wavelength band, of which only pure communication wavelength components are passed to the subscriber side optical transmitter / receiver 225, 226, 227. The component of the monitoring wavelength band is output to the anti-reflective port of the terminal light reflection parts 222, 223, and 224.

Contrary to the above-described process, the monitoring optical signal reflected from the section light reflecting units 214, 216, 217, and 218 and the communication optical signal output from the subscriber side optical transmitting and receiving units 225, 226, and 227. Enters the telephone station through the light path section.

Thus, among the optical signals transmitted to the telephone station, the monitoring wavelength band signal is separated by the multiplexing and demultiplexing unit 213 for each communication optical signal and the wavelength band and input to the b port of the optical circulator 230, and then through the c port. The demultiplexer 228 is output.

The monitoring optical signal transmitted to the demultiplexer 228 is demultiplexed for each wavelength and then transmitted to the reflected light receiver 229.

FIG. 3A is an exemplary configuration diagram of the section light reflecting unit of FIG. 2, and includes an optical fiber grating reflector 311 reflecting a monitoring optical signal in a monitoring wavelength band from a transmitting optical signal and a communication optical signal; An asymmetric optical splitter 312 for asymmetrically reflecting the optical signal transmitted from the optical fiber grating reflector 311 and an anti-reflective output port 313 for outputting without reflecting the optical signal transmitted from the asymmetric optical splitter 312 It consists of.

That is, the reflection characteristics of the optical fiber grating reflector 311 can be reflected in a specific wavelength band in the monitoring wavelength band, thereby making it possible to differentiate the reflected wavelength. In addition, the asymmetric optical splitter 312 device functions to separate some of the reflected optical signal to the non-reflective output port 313, the non-reflective output port 313 can be used as a connection port of the measuring instrument during the line test.

FIG. 3B is an exemplary configuration diagram of the longitudinal light reflecting unit of FIG. 2, and includes an optical fiber grating reflector 321 reflecting a monitoring optical signal in a monitoring wavelength band from a transmitting optical signal and a communication optical signal; A demultiplexer 322 for demultiplexing the optical signal transmitted from the optical fiber grating reflector 321 for each wavelength band, and an antireflective output port 323 for outputting without reflecting the optical signal transmitted from the demultiplexer 322. It is composed.

When the monitoring optical signal and the communication optical signal are input, only the specific wavelength component within the monitoring wavelength bandwidth is reflected by the optical fiber grating reflector 321 in the device and comes out again to the input side, and the remaining wavelength band components are input to the demultiplexer 322.

The demultiplexer 322 transmits the communication wavelength band signal to the output side, and the optical signal in the monitoring wavelength band is output through the anti-reflective output port 323.

In particular, the anti-reflective output port 323 can be used as a connection port of the line measuring instrument.

The operation of the optical subscriber line monitoring and testing apparatus of the present invention will be described with reference to FIGS. 2, 3A and 3B.

The present invention is installed in the telephone station, the optical line section, the subscriber side, in particular, the optical distribution unit (215, 219, 220, 221) is installed in the incoming terminal box where the optical line section or the group of subscribers, the section light reflecting unit ( 214, 216, 217, and 218 may be installed at the same location or implemented as a module with the light distribution units.

The longitudinal light reflection units 222, 223, and 224 are installed in the subscriber premises incoming terminal box. The optical signals sent from the monitoring optical signal generator 211 on the telephone station side are sectioned light reflectors 214, 216, 217, and 218 provided for each section, and end-type light reflectors 222, 223, and 224 provided for each subscriber. ), Only the intrinsic wavelengths of the optical fiber grating reflectors 311 and 321 set for each device are reflected and returned to the telephone station side reflected light receiving unit 229.

In addition, since the reflected light receiving unit 229 can receive signals for each wavelength, it is possible to continuously monitor whether there are any obstacles in a specific light path section or an optical subscriber line.

If a failure is found and a maintenance test is performed, the line maintainer connects the test meter to the non-reflective output ports 313 and 323 as shown in FIGS. 3A and 3B without the need for a separate test of the optical line. Track repair work can be performed.

In the line repair work, a monitoring optical signal may be used without the need for preparing a test optical signal source.

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

As described above, the present invention has the following effects by monitoring and testing a serviceless optical subscriber line using a wavelength reflector.

First, it is possible to provide a high quality subscriber service by enabling the precautionary maintenance by monitoring the track in real time regardless of the subscriber service status.

Second, it is possible to monitor by line section and by subscriber, so that the point of failure of the line can be detected immediately, and the maintenance cost can be drastically reduced by reducing the time required to identify the point of failure when recovering from the failure.

Third, the optical path used for monitoring can be used for the line test, and the test light source is not required for the test, and since the separate test does not need to be performed, the service can be provided without any trouble except the failure section.

Fourth, it can be used as an operation preservation system in a telecommunication line that emphasizes the monitoring and testing of the line facility without affecting the communication in the service.

Claims (4)

Claims [1] An optical subscriber line monitoring and testing apparatus implemented by a plurality of passive elements for continuously monitoring and testing a light path section between a telephone station and a subscriber side. Monitoring optical signal generating means for generating an optical signal for monitoring the light path section; The monitoring optical signal generated from the monitoring optical signal generating means and the first communication optical signal transmitted from the telephone station side are multiplexed, the second communication optical signal transmitted from the subscriber side, and the monitoring optical signal reflected and transmitted. Multiplexing and demultiplexing means for separating the; Light reflection and distribution means for distributing the communication optical signal after reflecting the monitoring optical signal in the monitoring wavelength band from the first communication optical signal multiplexed by the multiplexing and demultiplexing means to the multiplexing and demultiplexing means ; A plurality of first light reflecting means for transmitting only the communication optical signal in the communication wavelength band to the subscriber side in the optical signal distributed by the light reflection and distribution means, and reflecting the optical signal outside the communication wavelength band to the outside; Optical circulation means for transmitting the optical signal generated from the monitoring optical signal generating means to the light reflection and distribution means and for transmitting the monitoring optical signal demultiplexed by the multiplexing and demultiplexing means to the demultiplexing means; ; Demultiplexing means for demultiplexing the monitoring optical signal separated by the multiplexing and demultiplexing means for each wavelength; And Reflected light receiving means for receiving the monitoring optical signal demultiplexed by the demultiplexing means Optical subscriber line monitoring and testing device comprising a. The method of claim 1, wherein the light reflection and distribution means, Second light reflecting means for reflecting the monitoring optical signal in the monitoring wavelength band from the optical signal multiplexed by the multiplexing and demultiplexing means; First light distribution means for distributing the optical signal reflected by the second light reflecting means; A plurality of third light reflection means for reflecting the monitoring optical signal in the monitoring wavelength band from the optical signal distributed by the first optical distribution means; And A plurality of second light distribution means for correspondingly distributing the monitoring optical signal reflected by the plurality of third light reflecting means Optical subscriber line monitoring and testing device comprising a. The method of claim 1, wherein the first light reflecting means, A light reflecting unit for reflecting the monitoring optical signal in the monitoring wavelength band from the transmitted monitoring optical signal and the communication optical signal; A demultiplexer for demultiplexing the monitoring optical signal reflected by the light reflection unit for each wavelength band; And Non-reflective output unit for outputting without reflecting the optical signal demultiplexed by the demultiplexer Optical subscriber line monitoring and testing device comprising a. The method of claim 2, wherein the second light reflecting means and the plurality of third light reflecting means, respectively, A light reflecting unit for reflecting the monitoring optical signal in the monitoring wavelength band from the transmitted monitoring optical signal and the communication optical signal; An asymmetric light distribution unit for asymmetrically reflecting the monitoring optical signal reflected by the light reflection unit; And Non-reflective output unit for outputting without reflecting the optical signal asymmetrically reflected by the asymmetric light splitter Optical subscriber line monitoring and testing device comprising a.