KR200228565Y1 - Apparatus for repeating optical signal having optical switch - Google Patents

Abstract

The present invention is to provide an optical signal relay device having an optical switch, the present invention comprises a remote relay unit for performing the framing of the optical signal and detecting the alarm in the optical signal; An optical switch unit connected to the remote relay unit to switch in accordance with normal operation of the remote relay unit to continuously perform signal transmission between the master system and the plurality of remote systems; The WDM coupler is connected to the optical switch unit and includes a WDM coupler for performing a connection between the master system and the remote systems through an optical cable, so that the optical signal relay shuts down due to various causes such as a power problem of the remote system. In this case, it is possible to continuously perform signal transmission between the master repeater and the remote repeater.

Description

Apparatus for repeating optical signal having optical switch

The present invention relates to an optical signal relay device having an optical switch. In particular, the optical signal relay device continuously performs signal transmission between the master repeater and the remote repeater even when the optical signal repeater is shut down by various causes such as a power problem of the remote system. The present invention relates to an optical signal relay having an optical switch suitable for the following.

In general, optical communication refers to communication using an optical fiber as a communication medium. Since optical fiber transmits information through light, it has a merit that a large amount of information can be transmitted at high speed by using optical fiber using light, compared to general communication media using radio waves.

In addition, the optical signal relay is used to expand the communication service range and to perform digital services smoothly while minimizing the influence on the operating base station using the base station.

Optical signal repeater converts base station signal of high frequency or intermediate frequency band into optical signal, making it difficult for radio waves to reach directly, such as behind high-rise buildings, underground parking lots, and large buildings. Relay to a shadow area to allow the user to receive mobile communication services.

1 is a block diagram of a conventional optical signal relay.

As shown here, the master system 100 for connecting the optical path with the signal from the base station; It is composed of a plurality of remote systems 200 and 300 are connected to the master system 100 and an optical cable to connect the optical signal.

Here, the plurality of remote systems 200 and 300 are connected to the master system 100 and the first remote system 200 by the optical cable, the first remote system 200 and the second remote system 300 is connected by the optical cable It is connected in the same way as it is.

In the above, the master system 100, RF (Radio Frequency) module 110 for transmitting and receiving a signal wirelessly; A master relay unit connected to the RF module 110 to perform signal conversion and alarm detection; It is composed of a Wavelength Division Multiplexing (WDM) coupler (130) connected to the master relay unit 120 and connected to the first remote system 200 through an optical cable.

In the master relay unit 120, the optical signal input from the WDM coupler 130 converts the electrical signal, the O / E, E / O for converting the electrical signal input from the framer 122 to the optical signal An optical to electric signal and an electric to optical signal converter 121; Framer 122 connected to the O / E and E / O converter 121 and the A / D and D / A converter 123 to perform framing and deframing of a signal. )Wow; An A / D and D / A (Analog to Digital, Digital to Analog) converter 123 for performing analog-to-digital conversion on the signals of the framer 122 and the RF module 110; The alarm detector 124 detects an alarm from the framer 122.

The plurality of remote systems (200, 300) in the above, respectively, the RF module (210) (310) for transmitting and receiving a signal wirelessly; A remote relay unit (220) (320) connected to the RF module (210) (310) to perform signal conversion and alarm detection; It is composed of a WDM coupler 230 is connected to the remote relay unit 220, 320 is connected to the master system 100 or another remote system 200, 300 through an optical cable.

In the above, the remote relay unit 220 of the first remote system 200 converts the electric signal from the optical signal input from the WDM coupler 230 and converts the electric signal input from the framers 223 and 224. O / E and E / O converters 221 and 222 for converting into signals; Framers 223 and 224 connected to the O / E and E / O converters 221 and 222 and the A / D and D / A converters 225 and 226 for framing and deframing signals. )Wow; An A / D and D / A converter (225) (226) for performing analog-to-digital conversion on the signals of the framers (223) (224) and the RF module (210); The alarm detector 227 detects an alarm from the framers 223 and 224.

The WDM coupler 230 of the first remote system 200, the first and second WDM coupler 231 to be connected to the master system 100 or another remote system 300 through an optical cable. 232 is configured.

In addition, the configuration of the second remote system 300 is the same as the first remote system 200.

Referring to the operation of the conventional device configured as described above in detail.

The optical relay system is composed of a master system 100 and a plurality of remote systems 200 and 300. The plurality of remote systems 200, 300 may be connected linearly and in series by an optical cable.

The master system 100 performs signal processing such as band filtering and optical signal conversion from the base station, and transmits the signal to the remote systems 200 and 300 connected to the rear end via the optical path. In addition, the master system 100 performs signal processing such as electric signal conversion and band filtering on the signals received from the remote systems 200 and 300 at a later stage, and transmits them to the base station.

The signal transmitted / received between the base station and the master system 100 may be a high frequency or intermediate frequency signal modulated by a carrier corresponding to a CDMA data signal. In addition, the signal received from the base station may be a frequency allocation signal and may be a signal corresponding to a specific sector. The remote systems 200 and 300 are linearly and serially connected and installed at corresponding locations in the shadowed area or building.

The WDM coupler 130 transmits the forward and reverse signals using one optical path without separating the transmission optical signal line and the reception optical signal line.

In this case, the first WDM coupler 231 of the first remote system 200 interworks with the WDM coupler 130 of the master system 100 to transmit a forward signal from the base station and a reverse signal to the base station in different wavelength bands. Transmitted by optical path.

The second WDM coupler 232 of the first remote system 200 interoperates with the first WDM coupler 331 of the second remote system 300 at a later stage to differentiate forward signals from the base station and reverse signals to the base station. Transmitted by one optical line in the wavelength band.

The remote relay unit 210 of the first remote system 200 performs signal conversion and alarm detection.

In addition, the first O / E and E / O converters 221 in the remote relay unit 210 convert the optical signal input from the master system 100 into an electric signal, and the electric signal input from the first framer 223. Convert the signal into an optical signal.

The second O / E and E / O converter 222 in the remote relay 210 converts an optical signal input from the second remote system 300 into an electrical signal and is input from the second framer 224. Convert electrical signals into optical signals.

The first framer 223 receives the signals of the first O / E and E / O converter 221 and the first A / D and D / A converter 225 to perform framing and deframing.

The second framer 224 receives the signals of the second O / E and E / O converter 222 and the second A / D and D / A converter 226 to perform framing and deframing.

The first A / D and D / A converter 225 converts the digital signal input from the first framer 223 into an analog signal, outputs the analog signal to the RF module 210, and outputs the analog signal input from the RF module 210. The signal is converted into a digital signal and output to the first framer 223.

The second A / D and D / A converter 226 converts the digital signal input from the second framer 224 into an analog signal and outputs the analog signal to the RF module 210, and the analog input from the RF module 210. The signal is converted into a digital signal and output to the second framer 224.

The alarm detection unit 227 detects an alarm from the first and second framers 223 and 224 and is configured as a CPU.

The operation of the second remote system 300 is the same as the operation of the first remote system 200.

The remote system then distributes the forward signal at the front end, providing part of it as the forward signal path and relaying the rest to the back end. In addition, the reverse signal in the reverse stage and the reverse signal in the reverse signal path are combined and relayed to the front end.

However, in the related art, when one of the remote systems connected to the master system via the optical fiber becomes a failure due to a problem such as a power problem, the connection to the master system is disconnected from the failed remote system. As a result, despite the fact that the systems behind the failed remote system operate normally, there is a problem in that it is impossible to provide an optical communication service. In other words, if a failure occurs in the remote system, the relay operation is not made, but there is a problem that the function stops even after the remote system in which the failure occurs after the remote system normally operates.

Therefore, the present invention is proposed to solve the conventional problems as described above, and an object of the present invention is that the master repeater and the remote repeater even when the optical signal relay is shut down due to various causes such as power problems of the remote system. An optical signal relay device having an optical switch capable of continuously performing signal transmission therebetween.

1 is a block diagram of a conventional optical signal relay device,

2 is a block diagram of a system including an optical signal relay having an optical switch according to the present invention.

Explanation of symbols on the main parts of the drawings

100: master system 110: RF module

120: master relay 121: O / E, E / O converter

122: framer 123: A / D, D / A converter

124: alarm detection unit 130: WDM coupler

200: first remote system 210: RF module

220: remote relay unit 221, 222: O / E, E / O conversion unit

223, 224: Framer 225, 226: A / D, D / A converter

227: alarm detection unit 228: optical switch control unit

230, 231, 232: WDM coupler 240, 241 ~ 244: Optical switch part

300: second remote system 310: RF module

320: remote relay unit 321, 322: O / E, E / O conversion unit

323, 324: Framer 325, 326: A / D, D / A converter

327: alarm detection unit 328: optical switch control unit

330, 331, 332: WDM coupler 340, 341 ~ 344: optical switch unit

Hereinafter, an embodiment according to the technical idea of the present invention as described above, the optical signal relay device having an optical switch is as follows.

2 is a block diagram of a system including an optical signal relay having an optical switch according to the present invention.

As shown therein, a remote relay unit 220, 320 for framing the optical signal and detecting an alarm in the optical signal; Signals between the master system 100 and the plurality of remote systems 200 and 300 by switching with the remote relays 220 and 320 according to whether the remote relays 220 and 320 operate normally. An optical switch unit 240 and 340 to continuously perform the transmission; It is connected to the optical switch unit 240, 340, including a WDM coupler 230, 330 to perform the connection between the master system 100 and the remote systems 200, 300 through an optical cable It is composed.

The optical switch unit 240 receives the optical signal from the first WDM coupler 231 in the WDM coupler 230 and switches the optical signal to the remote relay unit 220 or the fourth optical switch 244. A first optical switch 241 for outputting; A second optical switch 242 for switching the optical signal input from the remote relay unit 220 or the third optical switch 243 to output the optical signal to the first WDM coupler 231; A third optical switch 243 for receiving an optical signal from the second WDM coupler 232 in the WDM coupler 230 and switching the optical signal to output the optical signal to the remote relay unit 220 or the second optical switch 242. Wow; And a fourth optical switch 244 for switching the optical signal input from the remote relay unit 220 or the first optical switch 241 to output the optical signal to the second WDM coupler 232.

In the remote relay unit 220, O / E for converting the electrical signal from the optical signal input from the WDM coupler 230, and converts the electrical signal input from the framers 223, 224 into an optical signal, An E / O converter 221 and 222; Framers 223 and 224 connected to the O / E and E / O converters 221 and 222 and the A / D and D / A converters 225 and 226 for framing and deframing signals. )Wow; An A / D and D / A converter (225) (226) for performing analog-to-digital conversion on the signals of the framers (223) (224) and the RF module (210); An alarm detector 227 for detecting an alarm from the framers 223 and 224; The alarm detection unit 227 is configured to include an optical switch control unit 228 for controlling the switching operation of the optical switch unit 240 according to whether the alarm is detected.

When the optical switch controller 228 does not detect an alarm in the alarm detector 227, the first optical switch 241 in the optical switch unit 240 is the first WDM coupler in the WDM coupler 230. In operation 231, the optical signal is received and controlled to output the optical signal to the remote relay unit 220, and the second optical switch 242 transmits the optical signal of the remote relay unit 220 to the first WDM coupler ( And a third optical switch 243 receives an optical signal from the second WDM coupler 232 in the WDM coupler 230 and outputs the optical signal to the remote relay unit 220. The four optical switch 244 controls to output the optical signal of the remote relay unit 220 to the second WDM coupler 232.

In the above, when the alarm is detected by the alarm detection unit 227, the optical switch control unit 228, the first optical switch 241 in the optical switch unit 240 is the first WDM coupler (WDM coupler 230) 231 receives the optical signal and controls to output the optical signal to the fourth optical switch 244, and the second optical switch 242 receives the optical signal of the third optical switch 243 and receives the first WDM coupler. And a third optical switch 243 receives an optical signal from the second WDM coupler 232 in the WDM coupler 230 and outputs the optical signal to the second optical switch 242. The fourth optical switch 244 controls to output the optical signal of the first optical switch 241 to the second WDM coupler 232.

Referring to the accompanying drawings, the operation of the optical signal relay having an optical switch according to the present invention configured as described in detail as follows.

First, the WDM coupler (130, 230, 330) is to transmit the forward and reverse signals using a single optical path without separating the transmission optical signal line and the receiving optical signal line.

The first WDM coupler 231 of the first remote system 200 interworks with the WDM coupler 130 on the master system 100 side, which is the front end, and forward signal from the base station via one optical path. Reverse Link signals to and from the base station are transmitted in different wavelength bands.

The second WDM coupler 232 of the first remote system 200 interworks with the first WDM coupler 331 of the second remote system 300 at the rear end, and forward signals from the base station and the base station via one optical path. Transmits the reverse signal to the different wavelength bands.

The remote systems 200 and 300 may perform a switching operation depending on whether a failure occurs in any of the remote systems 200 and 300.

Meanwhile, when each of the remote systems 200 and 300 is operating normally, it operates as follows.

The first optical switch 241 in the optical switch unit 240 receives an optical signal from the first WDM coupler 231 in the WDM coupler 230 and outputs an optical signal to the remote relay unit 220.

The second optical switch 242 outputs the optical signal of the remote relay unit 220 to the first WDM coupler 231.

The third optical switch 243 receives an optical signal from the second WDM coupler 232 in the WDM coupler 230 and outputs the optical signal to the remote relay unit 220.

The fourth optical switch 244 outputs the optical signal of the remote relay unit 220 to the second WDM coupler 232.

Accordingly, the optical signal from the master system 100 is processed by the remote relay unit 220 in the first remote system 200 and is also connected to the second remote system 300.

In addition, when a failure occurs in any one of the remote systems 200 and 300, the following switching operation is performed.

Here, the first optical switch 241 to the fourth optical switch 244 may be configured by passive elements and controlled by a manual operation of an operator. In addition, the failure may be a malfunction of the remote relay unit 220, or instability and shutdown of the remote system 200.

The first optical switch 241 in the optical switch unit 240 receives an optical signal from the first WDM coupler 231 in the WDM coupler 230 and outputs an optical signal to the fourth optical switch 244.

The second optical switch 242 receives the optical signal of the third optical switch 243 and outputs it to the first WDM coupler 231.

The third optical switch 243 receives an optical signal from the second WDM coupler 232 in the WDM coupler 230 and outputs the optical signal to the second optical switch 242.

The fourth optical switch 244 outputs the optical signal of the first optical switch 241 to the second WDM coupler 232.

Therefore, when a failure occurs in the first remote system 200, the optical signal from the master system 100 passes through the first remote system 200, and then the optical signal processing can be performed in the second remote system 300. do. Then, even when a failure occurs in the first remote system 200, the entire optical signal relay can be continuously maintained without stopping operation.

On the other hand, if the optical switch control unit 228 is installed in the remote relay unit 220, such a switching operation is automatically made.

Thus, when the remote system 200 operates normally and no alarm is detected by the alarm detector 227, the optical signal of the master system 100 and the optical signal of the second remote system 300 pass through the first remote system 200. And perform the necessary framing function in the first remote system 200.

That is, the first optical switch 241 receives the optical signal from the first WDM coupler 231 to control the optical signal to be output to the remote relay unit 220, and the second optical switch 242 is the remote relay unit ( The optical signal of the 220 is controlled to be output to the first WDM coupler 231, and the third optical switch 243 is controlled to receive the optical signal from the second WDM coupler 232 and output the optical signal to the remote relay unit 220. In addition, the fourth optical switch 244 controls to output the optical signal of the remote relay unit 220 to the second WDM coupler 232.

In addition, when the first remote system 200 does not operate normally and an alarm is detected by the alarm detector 227, the optical signals of the master system 100 and the second remote system 300 are processed by the first remote system 200. To pass through.

That is, the first optical switch 241 receives the optical signal from the first WDM coupler 231 to control the optical signal to be output to the fourth optical switch 244, and the second optical switch 242 controls the third optical signal. The optical signal of the switch 243 is input and controlled to be output to the first WDM coupler 231, and the third optical switch 243 receives the optical signal from the second WDM coupler 232 and the second optical switch 242. ), And the fourth optical switch 244 controls to output the optical signal of the first optical switch 241 to the second WDM coupler 232.

Therefore, it is possible to relay the forward signal received from the front end and the reverse signal received from the rear end, it is possible to provide an uninterrupted service even if a failure occurs in the remote system (200).

Meanwhile, since the manual switching operation in the optical switch unit 340 and the automatic switching operation in the optical switch control unit 328 in the second remote system 300 are the same as those in the first remote system 200, description thereof will be omitted. .

As such, the present invention continuously performs signal transmission between the master repeater and the remote repeater even when the optical signal repeater is shut down by various causes such as a power problem of the remote system.

While the preferred embodiment of the present invention has been described above, the present invention may use various changes, modifications, and equivalents. It is clear that the present invention can be applied in the same manner by appropriately modifying the above embodiments. Therefore, the above description does not limit the scope of the present invention defined by the limits of the following utility model registration claims.

As described above, the optical signal relay device having an optical switch according to the present invention can be used to relay signals transmitted even when the optical signal relay device is shut down due to various causes such as a power problem of a remote system. By switching and relaying to the device, it is possible to continuously carry out signal transmission between the master repeater and the remote repeater, thereby providing an uninterrupted optical communication service.

Claims (5)

A remote relay unit for framing the optical signal and detecting an alarm in the optical signal; An optical switch unit connected to the remote relay unit to switch in accordance with normal operation of the remote relay unit to continuously perform signal transmission between the master system and the plurality of remote systems; And a WDM coupler connected to the optical switch unit and configured to perform a connection between the master system and a remote system through an optical cable. The method of claim 1, wherein the optical switch unit, A first optical switch configured to receive an optical signal from the first WDM coupler in the WDM coupler and to switch the optical signal to output the optical signal to the remote relay unit or the fourth optical switch; A second optical switch for switching an optical signal input from the remote relay unit or a third optical switch to output an optical signal to the first WDM coupler; A third optical switch configured to receive an optical signal from the second WDM coupler in the WDM coupler and to switch the optical signal to output the optical signal to the remote relay unit or the second optical switch; And a fourth optical switch for switching the optical signal input from the remote relay unit or the first optical switch to output the optical signal to the second WDM coupler. The method of claim 1, wherein the remote relay unit, An O / E and E / O conversion unit for converting an optical signal input from the WDM coupler and converting an electrical signal input from a framer into an optical signal; A framer connected to the O / E and E / O converters and the A / D and D / A converters to perform signal framing and deframing; An A / D and D / A converter for performing analog-to-digital conversion on the signals of the framer and the RF module; An alarm detector detecting an alarm from the framer; And an optical switch control unit configured to control a switching operation of the optical switch unit according to whether the alarm is detected by the alarm detection unit. The method of claim 3, wherein the optical switch control unit, If the alarm is not detected by the alarm detecting unit, the first optical switch in the optical switch unit controls the optical signal from the first WDM coupler in the WDM coupler to output the optical signal to the remote relay unit, and the second optical switch. Is controlled to output an optical signal of the remote relay unit to the first WDM coupler, and a third optical switch is configured to receive an optical signal from a second WDM coupler in the WDM coupler and output the optical signal to the remote relay unit; And a switch controls to output the optical signal of the remote relay unit to the second WDM coupler. The method of claim 3, wherein the optical switch control unit, When the alarm is detected by the alarm detecting unit, the first optical switch in the optical switch unit controls the optical signal from the first WDM coupler in the WDM coupler to output the optical signal to the fourth optical switch, and the second optical switch Receives an optical signal of a third optical switch and outputs the optical signal to the first WDM coupler, and the third optical switch receives the optical signal from the second WDM coupler in the WDM coupler and outputs the optical signal to the second optical switch. And a fourth optical switch controls to output the optical signal of the first optical switch to the second WDM coupler.