KR20000038379A - Apparatus for monitoring and testing optical subscriber line - Google Patents

Abstract

PURPOSE: An apparatus for monitoring and testing optical subscriber line is provided to offer an excellent subscriber service by monitoring a line at a real time regardless of a state of the subscriber service. CONSTITUTION: A monitoring optical signal generating unit(211) generates a monitoring optical signal for monitoring an interval of an optical line. A multiplexing and demultiplexing unit(213) multiplexes the monitoring optical signal generated in the monitoring optical signal generating unit(211) and a communication optical signal transmitted from an optical transmitting and receiving unit(212) and separates the monitoring optical signal. An optical reflective unit(214) reflects a monitoring optical signal in a monitoring wave band from the optical signal multiplexed by the multiplexing and demultiplexing unit(213) to the multiplexing and demultiplexing unit(213). An optical dividing device(215) divides the optical signal transmitted from the optical reflective unit(214). Optical reflective units(216-218) reflect a monitoring optical signal in a wave band from the optical signal transmitted from the optical dividing device(215) to the multiplexing and demultiplexing unit(213). A demultiplexing unit(228) demultiplexes the monitoring optical signal transmitted from the multiplexing and demultiplexing unit(213) according to a wavelength. A reflective optical receiving unit(229) receives the monitoring optical signal demultiplexed in the demultiplexing unit(228).

Description

Optical subscriber line monitoring and test device

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 can not be recognized in advance even if a line failure occurs.

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 the point of failure 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.

Accordingly, the present invention has been made in order to solve the above problems, while intensively monitoring the optical subscriber line at the telephone station to test the line facilities without affecting the communication of subscribers during the service, and each line section and line device Can be classified and distinguished by the characteristic optical wavelength parameter so that it can monitor and test the line fault section and the line fault device accurately and also monitor and test the optical subscriber line by adopting the passive element, so that power for driving the device is needed. 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 transmitting and receiving part of telephone station

213: multiplexing and demultiplexing unit

214, 216, 217, 218: section light reflecting unit

215, 219, 220, 221: light distribution

222, 223, 224: vertical light reflectors

225, 226, 227: subscriber's optical transceiver

228 demultiplexer

229: reflected light receiver

In order to achieve the above object, the present invention provides an optical subscriber line monitoring and testing apparatus for monitoring and testing an optical path section between a telephone station and a subscriber side, wherein the monitoring generates a monitoring optical signal for monitoring the optical path section. Optical signal generating means; Multiplexing and inversely multiplexing the monitoring optical signal and the first communication optical signal transmitted from the telephone station, separating and transmitting the second communication optical signal transmitted from the subscriber side and the reflected optical signal transmitted and reflected Multiplexing means; Light reflection and distribution means for distributing the optical signal after reflecting the monitoring optical signal in the monitoring wavelength band from the 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 transmitted from the light reflection and distribution means, and reflecting the optical signal outside the communication wavelength band to the outside; 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. In the optical signal, the interval light reflecting unit 214 reflects the monitoring optical signal in the monitoring wavelength band to the multiplexing and demultiplexing unit 213, and an optical powder for distributing the optical signal transmitted from the light reflecting unit 214. Distribution 215 and section light reflecting units 216, 217, and 218 reflecting the optical signal for monitoring in the wavelength band for monitoring to the multiplexing and demultiplexing unit 213 from the optical signal distributed and transmitted by the optical distribution unit 215. ), Optical distribution units 219, 220, and 221 for distributing optical signals correspondingly transmitted from the section light reflecting units 216, 217, and 218, and light transmitted from the optical distribution 220. In the signal, only the communication optical signal within the communication wavelength band is transmitted to the subscriber side, and the optical signal outside the communication wavelength band is reflected to the outside through the non-reflective port, and the multiplexing and demultiplexing unit 222, 223 and 224 A demultiplexer 228 for demultiplexing the monitoring optical signal separated and transmitted by the unit 213 for each wavelength, and a reflected light receiver for receiving the monitoring optical signal demultiplexed by the demultiplexer 228. 229, and from the monitoring optical signal generator 211 through a port The transmitted optical signal for monitoring is transmitted to the multiplexing and demultiplexing unit 213 through the b port, and the demultiplexing unit for monitoring optical signal transmitted through the b port from the multiplexing and demultiplexing unit 213 to the c port. And an optical circulator 230 for delivering to 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 inputted to the a port of the optical purifier 230 and then output to the b port so that the next-stage multiplexing and demultiplexing unit 213 receives the telephone station-side optical transmission and reception. 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 optical signal 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 communication line where the monitoring and testing of the rail facility is emphasized without affecting the communication in the service.

Claims (5)

In the optical subscriber line monitoring and testing apparatus for monitoring and testing the optical path section between the telephone station and the subscriber side, Monitoring optical signal generating means for generating a monitoring optical signal for monitoring the light path section; Multiplexing and inversely multiplexing the monitoring optical signal and the first communication optical signal transmitted from the telephone station, separating and transmitting the second communication optical signal transmitted from the subscriber side and the reflected optical signal transmitted and reflected Multiplexing means; Light reflection and distribution means for distributing the optical signal after reflecting the monitoring optical signal in the monitoring wavelength band from the 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 transmitted from the light reflection and distribution means, and reflecting the optical signal outside the communication wavelength band to the outside; 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, Optical circulation which transmits the optical signal generated from the monitoring optical signal generating means to the light reflection and distribution means, and delivers the monitoring optical signal which is demultiplexed and transmitted by the multiplexing and demultiplexing means to the demultiplexing means. Way Optical subscriber line monitoring and testing device further comprises. The method according to claim 1 or 2, The light reflection and distribution means, Second light reflecting means for reflecting said monitoring optical signal in said monitoring wavelength band in the optical signal multiplexed by said multiplexing and demultiplexing means; First light distribution means for distributing an optical signal transmitted from said second light reflecting means; A plurality of third light reflecting means for reflecting said monitoring optical signal in said monitoring wavelength band in the optical signal distributed and transmitted by said first light distribution means; And A plurality of second optical distribution means for distributing optical signals correspondingly transmitted from the plurality of third optical half means; Optical subscriber line monitoring and testing device comprising a. The method of claim 2, The first light reflecting means, A light reflection unit 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 optical signal transmitted from the light reflection unit for each wavelength band; And Anti-reflective output unit for outputting without reflecting the optical signal transmitted from the demultiplexer Optical subscriber line monitoring and testing device comprising a. The method of claim 3, wherein The second light reflecting means and the plurality of third light reflecting means, respectively, A light reflection 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 optical signal transmitted from the light reflection unit; And Anti-reflective output unit for outputting without reflecting the optical signal transmitted from the asymmetric light distribution unit Optical subscriber line monitoring and testing device comprising a.