KR100282551B1 - Monitoring channel insertion and extraction device and method in multi-channel optical transmission system - Google Patents

Abstract

1. TECHNICAL FIELD OF THE INVENTION

The present invention relates to a surveillance channel insertion and extraction apparatus and method in a multi-channel optical transmission system.

2. The problem to be solved by the invention

According to the present invention, in a multi-channel optical transmission system using a wavelength division multiplexing method, a channel is inserted and extracted to monitor each channel by extracting a multi-section monitoring channel after inserting a multi-section monitoring channel by aligning a wavelength interval of each light source. And a method thereof.

3. Summary of Solution to Invention

According to an aspect of the present invention, there is provided an apparatus comprising: monitoring channel inserting means for generating an optical signal of a multi-section monitoring channel and inserting the multiplexed optical signal into an optical signal of a multi-section monitoring channel; And monitoring channel extracting means for extracting the optical signal of the monitoring channel from the optical signal of the multiple section monitoring channel into which the multiplexing optical signal is inserted.

4. Important uses of the invention

The present invention is used to monitor each channel in a multi-channel optical transmission system.

Description

Surveillance channel insertion and extraction device and method in multi-channel optical transmission system

The present invention relates to an apparatus for monitoring channel insertion and extraction in a multi-channel optical transmission system, and a method thereof. In particular, in a multi-channel optical transmission system using a wavelength division multiplexing method, a wavelength interval of each light source is aligned to insert a multi-section supervisory channel, The present invention relates to a surveillance channel insertion and extraction apparatus and a method for extracting an interval surveillance channel to monitor each channel.

In general, optical frequency (or wavelength) division multiplexing, which transmits light through one strand of optical fiber by multiplexing channels having different optical frequencies (or wavelengths), is an optical transmission technology that maximizes transmission capacity. The side extracted the wavelength of the desired channel using an optical filter and a fiber grating (fiber grating) that can identify the wavelength for each channel.

In addition, conventional signal monitoring methods include a method of monitoring a channel using a modulated signal after modulating a laser diode at a low frequency, and a method of monitoring by inserting a separate monitoring channel wavelength into a multiplexer.

However, in the conventional signal monitoring method as described above, there is a problem that the optical signal processing process is very complicated, and thus the optical signal multiplexing cannot be performed at once as the number of channels increases in the multi-channel transmission.

Accordingly, the present invention has been made to solve the above problems, and in the multi-channel optical transmission system to align the wavelength interval of each light source to transmit the first through the optical fiber, before and after the second optical multiplexing by group Insert the multi-channel monitoring channel while monitoring the average light intensity of the input / output optical signals, and extract the multi-zone monitoring channel before demultiplexing while monitoring the light intensity of the input / output optical signals before and after the first demultiplexing by group. It is an object of the present invention to provide a monitoring channel insertion and extraction apparatus and method thereof, and a computer-readable recording medium that records a program for realizing the abnormality, by which the channel can be easily identified by monitoring the channel.

1 is a block diagram of an embodiment of a monitoring channel insertion and extraction apparatus in a multi-channel optical transmission system according to the present invention.

Figure 2 is a configuration of another embodiment of the monitoring channel insertion and extraction apparatus in a multi-channel optical transmission system according to the present invention.

Explanation of symbols on main parts of drawing

111 to 11 (n + 1), 211 to 21 (n + 1): optical separator

121 to 12 (n + 1), 221 to 22 (n + 1): photoelectric converter

130: optical multiplexer

131 to 13 (n + 1), 231 to 23 (n + 1): amplifier

140, 240: multiplexer

150, 250: A / D Converter

160, 270: Decoder

170: surveillance channel inserter

210: surveillance channel extractor

In order to achieve the above object, the present invention provides an apparatus for inserting and extracting a supervisory channel in a multi-channel optical transmission system, wherein the optical signals obtained by separating and separating input optical signals multiplexed and transmitted from the outside are divided into first and second groups. And converting the optical signals of the first group into electrical signals and multiplexing them, and then converting the multiplexed signals back into digital signals to generate optical signals of the multi-zone monitoring channel according to the converted signals. Supervisory channel insertion means for multiplexing the optical signals and inserting and multiplexing the optical signals into the optical signals of the multi-zone supervisory channel; And extracting the optical signal of the surveillance channel from the optical signal of the multiple section surveillance channel into which the multiplexed optical signal transmitted from the surveillance channel insertion unit is inserted, and separating the optical signal of the surveillance channel into a third group and a fourth group. Supervisory channel extraction means for demultiplexing the optical signal divided into three groups, converting the optical signal and the demultiplexed optical signal divided into the fourth group into electrical signals, multiplexing them, and then converting them into digital signals for transmission to the outside It includes.

In addition, the present invention provides a method for inserting and extracting a supervisory channel in a multi-channel optical transmission system, comprising: a first step of dividing and separating optical signals separated and separated into first and second groups by input optical signals multiplexed and transmitted; A second step of converting and multiplexing the optical signals of the first group into electrical signals, and then converting the multiplexed signals back into digital signals and generating optical signals of a multi-section monitoring channel according to the converted signals; A third step of multiplexing the optical signals of the second group and inserting and multiplexing the optical signals into the optical signals of the multi-zone monitoring channel; A fourth step of extracting the optical signal of the surveillance channel from the optical signal of the multiple section surveillance channel into which the multiplexed optical signal is inserted and separating the optical signal of the surveillance channel into a third group and a fourth group; And demultiplexing the optical signal divided into the third group, converting the optical signal and the demultiplexed optical signal divided into the fourth group into an electrical signal, multiplexing the resultant, and converting the optical signal into a digital signal and transmitting the result to an external device. It includes five steps.

The present invention also provides an information providing system having a processor, comprising: a first function of dividing input optical signals, which are multiplexed and transmitted from the outside, into divided first and second groups; A second function of converting the first group of optical signals into electrical signals and multiplexing them, and then converting the multiplexed signals back into digital signals to generate optical signals of a multi-section monitoring channel according to the converted signals; A third function of multiplexing the optical signals of the second group and inserting and multiplexing the optical signals into the optical signals of the multi-zone monitoring channel; A fourth function of extracting the optical signal of the surveillance channel from the optical signal of the multiple section surveillance channel into which the multiplexed optical signal is inserted and separating the optical signal of the surveillance channel into a third group and a fourth group; And demultiplexing the optical signal divided into the third group, converting the optical signal and the demultiplexed optical signal divided into the fourth group into an electrical signal, multiplexing the resultant, and converting the optical signal into a digital signal and transmitting the result to an external device. 5 Provide a computer-readable recording medium that records a program for realizing the function.

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

1 is a block diagram of an embodiment of a monitoring channel insertion and extraction apparatus in a multi-channel optical transmission system according to the present invention.

As shown in FIG. 1, the monitoring channel insertion and extraction apparatus according to an embodiment of the present invention includes a plurality of optical splitters 111 to 11n for separating input optical signals that are multiplexed and transmitted from the outside, and The optical / electric converters 121 to 12n for correspondingly converting the optical signal separated and transmitted by the separators 111 to 11n into electrical signals and the optical separators 11 to 11n are separated and transmitted. An optical multiplexer 130 for multiplexing the received optical signals, an optical splitter 11 (n + 1) for separating the optical signal multiplexed by the optical multiplexer 130, and an optical splitter 11 (n + 1)) output from the opto-electric converter 12 (n + 1) and the opto-electric converters 121 to 12 (n + 1) for converting the transmitted optical signal into an electrical signal. Amplifiers 131 to 13 (n + 1) for correspondingly amplifying the electrical signals, and pre-amplified by amplifiers 131 to 13 (n + 1). A multiplexer 140 for multiplexing the miracle signals, an A / D converter 150 for converting a signal of the analog form multiplexed through the multiplexer 140 into a digital signal, and an A / D converter 150 A decoder 160 for decoding the digital signal converted and transmitted by the receiver, a surveillance channel transmitter 170 for receiving the signal output from the decoder 160, and transmitting an optical signal of the surveillance channel; n + 1)) by comparing the magnitude of a predetermined reference signal with the signal output from the decoder 160 and the optical inserter 180 for inserting and transmitting the optical signal transmitted to the optical signal of the monitoring channel And a warning controller 190 for generating a warning control signal according to the comparison result, and a light emitting diode 191 for warning that the converted electrical signal is not normal according to the warning control signal transmitted from the warning controller 190. ).

FIG. 1 illustrates the monitoring of an input / output signal and the insertion of a multi-zone monitoring channel during secondary optical multiplexing in an optical multiplex terminal after the primary optical multiplexing for each group in a multichannel optical transmission system. Same as

The optical signal from the laser is modulated by the modulator and transmitted through the optical fiber at the output of the modulator.

The optical signal transmitted through the optical fiber is first multiplexed by groups and connected to the optical multiple terminators by optical connectors (G1, ..., GN).

Each of the multiplexed optical signals connected to the optical connectors G1, ..., GN separates a portion of the optical signal guided by the optical separators 111 to 11n and transfers them to the optical / electric converters 121 to 12n. The remaining optical signals are guided to the optical multiplexer 130 and multiplexed.

The optical signals entering the optical multiplexer 130 are multiplexed and transmitted to the optical splitter 11 (n + 1). In this way, a part of the multiplexed optical signal is separated by the optical separator 11 (n + 1) and transmitted to the optical / electrical converter 12 (n + 1), and transmitted to the optical separator 11 (n + 1). The remaining optical signal is separated by the optical fiber.

Then, the optical signal separated and transmitted by the optical separator 11 (n + 1) is inserted into the optical signal of the multi-section monitoring channel transmitted from the monitoring channel transmitter 170 by the optical inserter 180 and then the optical signal. Is transmitted through connector G11.

The optical signals transmitted to the photoelectric converters 121 to 12 (n + 1) are converted into electrical signals and amplified by the amplifiers 131 to 13 (n + 1), respectively, into the multiplexer 140 and multiplexed. The signals entering the firearm (! 40) are converted into digital signals by the A / D converter 150, decoded by the decoder 160, and then transmitted to an external computer. In this way, it is possible to confirm the abnormality through the signal transmitted to the computer.

When the magnitude of each converted signal is out of a predetermined reference value, the warning controller 190 outputs a warning control signal to emit light from the light emitting diode 191.

2 is a configuration diagram of another embodiment of a monitoring channel insertion and extraction apparatus in a multi-channel optical transmission system according to the present invention.

As shown in FIG. 2, in the multi-channel optical transmission system according to another exemplary embodiment of the present invention, the apparatus for inserting and extracting a supervisory channel extracts an optical signal of the supervisory channel transmitted from the optical inserter 180 of FIG. 1. The optical extractor 210, the optical separator 211 for separating the optical signal extracted by the optical extractor 210, and the optical signal separated and transmitted by the optical separator 211 for converting the optical signal into an electrical signal. The optical / electric converter 221, the demultiplexer 230 for demultiplexing the optical signal separated and transmitted by the optical separator 211, and the optical separator for separating the optical signal transmitted from the demultiplexer 230. Opto-electric converter 222 for correspondingly converting the optical signal separated and transmitted by the 212 to 21 (n + 1) and the optical splitters 212 to 21 (n + 1) into an electrical signal. To 22 (n + 1) and electrical signals transmitted from the photoelectric / electric converters 221 to 22 (n + 1). Amplifiers 231 to 23 (n + 1) for amplifying, a multiplexer 240 for multiplexing electrical signals transmitted from the amplifiers 231 to 23 (n + 1), and a multiplexer 240 An A / D converter 250 for converting the multiplexed analog signal into a digital signal through the apparatus, a monitoring channel receiver 260 for receiving the optical signal of the monitoring channel extracted by the light extractor 210, and an A / D A decoder 270 for decoding the digital signal transmitted from the converter 250 and the optical signal transmitted from the surveillance channel receiver 260, and the signal output from the decoder 270 and the optical signal transmitted from the surveillance channel receiver 260. According to the warning controller 280 and the warning control signal transmitted from the progress controller 280 for generating a warning control signal according to the comparison result by comparing the magnitude of the signal and the predetermined reference signal, the converted electrical signal is normal. Flash to warn you not Diode 290 is provided.

2 is a diagram illustrating a signal monitoring process for separating a multi-zone monitoring channel from a multiplex terminator by multiplexing optical signals transmitted by multiplexing in a multi-channel optical transmission, and before and after demultiplexing.

The signal, which is multiplexed and transmitted through the optical fiber and the optical amplifier, is connected to the wide area multi-terminator through the optical connector G21.

In the demultiplexer, the optical signal of the multi-zone supervisory channel is extracted by the optical extractor 210 and processed by the supervisory channel receiver 260, and then decoded through the decoder 270 to be transmitted to an external computer. Therefore, the monitoring information on the optical signal can be known through the computer.

Multiple signals separated from the multi-zone monitoring channel are separated by a part of the optical signal multiplexed by the optical separator 211 and transmitted to the optical / electric converter 221, and the remaining optical signals are guided and transferred to the demultiplexer 230. do.

The optical signal entering the demultiplexer 230 is separated into optical connectors G31, ..., G3n for each channel group, and comes out through the optical fiber. After separation by 21 (n + 1), they are transferred to optoelectric converters 222 to 22 (n + 1), respectively.

Optical signals transmitted to the photoelectric converters 221 to 22 (n + 1) are converted into electrical signals and amplified through the amplifiers 231 to 23 (n + 1), respectively, to enter the multiplexer 240, The signals entering the multiplexer 240 are converted into digital signals by the A / D converter 250 and then decoded through the decoder 270 and transferred to the computer. In this way, it is possible to confirm the abnormality through the signal transmitted to the computer.

When the magnitude of each converted signal is out of a preset reference value, the warning controller 280 outputs a warning control signal to emit light from the light emitting diode 290.

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, according to the present invention, as the number of channels increases in a multi-channel optical transmission system, optical multiplexing and demultiplexing are not performed at a time, but separated into groups and multiplexed, thereby easily inserting and extracting the position and the monitoring channel of the multi-zone monitoring channel. As a result, the system can be easily expanded according to the increase in the number of channels, and the operation and maintenance of the system can be made very easy.

Claims (7)

In the monitoring channel insertion and extraction apparatus in a multi-channel optical transmission system, After splitting the input optical signals, which are multiplexed and transmitted from the outside, are divided into first and second groups, and the optical signals of the first group are converted into electrical signals and multiplexed, and then the multiplexed signals are again converted into digital signals. To generate an optical signal of the multi-zone monitoring channel according to the converted signals, and to insert and transmit the multiplexed optical signal into the optical signal of the multi-zone monitoring channel. Insertion means; And The optical signal of the surveillance channel extracted by extracting the optical signal of the surveillance channel from the optical signal of the multiple section surveillance channel into which the multiplexed optical signal transmitted from the surveillance channel insertion means is inserted is divided into a third group and a fourth group, and the third A supervisory channel extraction means for demultiplexing the optical signals divided into groups, converting the optical signals and the demultiplexed optical signals into the fourth group into electrical signals, multiplexing them, and then converting them into digital signals and transmitting them to the outside Surveillance channel insertion and extraction device in a multi-channel optical transmission system comprising a. The method of claim 1, The monitoring channel insertion means, A plurality of first optical separation means for separating an input optical signal multiplexed and transmitted from the outside; A plurality of first optical / electric conversion means for correspondingly converting the optical signal separated and transmitted by the plurality of first optical separation means into an electrical signal; Optical multiplexing means for multiplexing the optical signals separated and transmitted by the plurality of first optical separation means; Second optical separation means for separating the optical signal multiplexed by the optical multiplexing means; Second optical / electric conversion means for converting the optical signal separated and transmitted by the second optical separation means into an electrical signal; A plurality of amplifying means for correspondingly amplifying the electrical signals output from the plurality of first / electric conversion means and the second optical / electric conversion means; Multiplexing means for multiplexing the electrical signals amplified by the plurality of amplifying means; A / D conversion means for converting the signal of the analog form multiplexed by the multiplexing means into a digital signal; Decoding means for decoding the digital signal converted and transmitted by said A / D conversion means; Surveillance channel transmission means for receiving the signal output from the decoding means and transmitting an optical signal of the surveillance channel; And An optical insertion means for inserting an optical signal separated and transmitted by the second optical separation means into an optical signal of the surveillance channel and transmitting the optical signal to the surveillance channel extraction means; Surveillance channel insertion and extraction device in a multi-channel optical transmission system comprising a. The method of claim 2, Warning control means for comparing a signal output from the decoding means with a predetermined reference signal and generating a warning control signal according to a comparison result; And Warning means for warning that the converted electrical signal is not normal according to the warning control signal Surveillance channel insertion and extraction device in a multi-channel optical transmission system made further comprising. The method of claim 1, The monitoring channel extraction means, Light extraction means for extracting an optical signal of the surveillance channel transmitted from the surveillance channel insertion means; First optical separation means for separating the optical signal extracted by the light extraction means; First optical / electric conversion means for converting the optical signal separated and transmitted by the first optical separation means into an electrical signal; Demultiplexing means for demultiplexing the optical signal separated and transmitted by the first optical separation means; A plurality of second optical separation means for separating the optical signal transmitted from the demultiplexing means; A plurality of second optical / electric conversion means for correspondingly converting the optical signal separated and transmitted by the plurality of second optical separation means into an electrical signal; A plurality of amplifying means for correspondingly amplifying an electrical signal transmitted from said first photoelectric conversion means and said plurality of photoelectric conversion means; Multiplexing means for multiplexing electrical signals transmitted from said multi-state amplifying means; A / D conversion means for converting the analog signal multiplexed by the multiplexing means into a digital signal; Surveillance channel receiving means for receiving an optical signal of the surveillance channel extracted by the light extraction means; And Decoding means for decoding the digital signal transmitted from the A / D conversion means and the optical signal transmitted from the surveillance channel receiving means Surveillance channel insertion and extraction device in a multi-channel optical transmission system comprising a. The method of claim 2, Warning control means for comparing the signal output from the decoding means and the magnitude of the predetermined reference signal with the optical signal transmitted from the monitoring channel receiving means, and generating a warning control signal according to a comparison result; And Warning means for warning that the converted electrical signal is not normal according to the warning control signal Surveillance channel insertion and extraction device in a multi-channel optical transmission system made further comprising. In the monitoring channel insertion and extraction method in a multi-channel optical transmission system, A first step of dividing the input optical signals, which are multiplexed and transmitted from the outside, into divided first and second groups; A second step of converting and multiplexing the optical signals of the first group into electrical signals, and then converting the multiplexed signals back into digital signals and generating optical signals of a multi-section monitoring channel according to the converted signals; A third step of multiplexing the optical signals of the second group and inserting and multiplexing the optical signals into the optical signals of the multi-zone monitoring channel; A fourth step of extracting the optical signal of the surveillance channel from the optical signal of the multiple section surveillance channel into which the multiplexed optical signal is inserted and separating the optical signal of the surveillance channel into a third group and a fourth group; And Demultiplexing the optical signals separated into the third group, and converting the optical signals and the demultiplexed optical signals into the fourth group into electrical signals, multiplexing them, and then converting them into digital signals and transmitting them to the outside step Surveillance channel insertion and extraction method in a multi-channel optical transmission system comprising a. In an information providing system having a processor, A first function of dividing the input optical signals multiplexed from the outside and dividing the separated optical signals into first and second groups; A second function of converting the first group of optical signals into electrical signals and multiplexing them, and then converting the multiplexed signals back into digital signals to generate optical signals of a multi-section monitoring channel according to the converted signals; A third function of multiplexing the optical signals of the second group and inserting and multiplexing the optical signals into the optical signals of the multi-zone monitoring channel; A fourth function of extracting the optical signal of the surveillance channel from the optical signal of the multiple section surveillance channel into which the multiplexed optical signal is inserted and separating the optical signal of the surveillance channel into a third group and a fourth group; And Demultiplexing the optical signals separated into the third group, and converting the optical signals and the demultiplexed optical signals into the fourth group into electrical signals, multiplexing them, and then converting them into digital signals and transmitting them to the outside function A computer-readable recording medium having recorded thereon a program for realizing this.