KR20100065993A - System and method for transmitting/receiving a optical signal - Google Patents

Abstract

PURPOSE: A system and a method for transmitting/receiving an optical signal are provided to transmit through BS sector signals through one optical cable. CONSTITUTION: A doner(120) receives two or more signals according to each sector of a base station(110). After electrical to optical conversion by sector of received signals, the doner generates the first signals by the converted signals of the first WDN. The doner generates the second signal by the second WDM of the first signals. A remote(130) receives the second signal through one optical line. The remote restores the sector signals by sectors from the received second signal.

Description

Optical signal transmission system and method {SYSTEM AND METHOD FOR TRANSMITTING / RECEIVING A OPTICAL SIGNAL}

The present invention relates to an optical signal transmission and reception system and method, and more particularly, to an optical signal transmission and reception system and method that does not require an additional optical path with an increase in base station sector signals.

In more detail, at least two signals are received for each sector of the base station, pre / optical conversion of the received signals for each sector, and first wavelength division multiplexing of the pre / optical conversion signals for each sector. A first photoelectric conversion and transmission / reception means (hereinafter, referred to as a 'donor') for generating signals, generating a second signal by performing second wavelength division multiplexing on the first signals, and transmitting the second signal; The base station receives the second signal through an optical path, restores the first signals by performing first wavelength division demultiplexing on the received second signal, and performs a second wavelength division demultiplexing of the first signals. And a second photoelectric conversion and transmission / reception means (hereinafter referred to as “remote”) for restoring sector-specific signals and optically / electrically converting the restored signals to a repeater. A.

In general, in a communication system, a base station manages a cell for providing a communication service to a terminal. The cell means a service providing area capable of providing a communication service to mobile terminals around the base station.

Meanwhile, the base station may divide the cell into at least two sectors to improve service quality and efficiently use frequency resources. As described above, the base station may transmit a signal operated in each sector to a base station or a repeater in a remote location. In this case, the base station may use the optical path as a backbone network with a base station or repeater connected thereto.

As described above, when the optical path is used as the backbone, the base station transmits a signal for one base station sector through one optical path. If the base station assumes that the cell is divided into three sectors, three optical paths are required for three sector signal transmission. In addition, assuming that the base station divides the cell into six sectors, it requires six optical paths for transmitting six sector signals.

Therefore, when the cell of the base station is divided into sectors, there is a problem that as many sectors as the number of sectors are required to transmit the base station sector signal through the optical path.

Accordingly, an object of the present invention is to provide an optical signal transmission / reception system and method that do not require an additional optical path according to an increase in the number of sectors of a base station.

Another object of the present invention is to provide an optical signal transmission / reception system and method for transmitting base station sector signals through a single optical path.

A system of the present invention for achieving the above objects in the optical signal transmission and reception system, receiving at least two signals for each sector of the base station, pre-optical conversion of the received signals for each sector, A donor for generating first signals by performing first wavelength division multiplexing on the converted signals for each sector, generating a second signal by performing second wavelength division multiplexing on the first signals, and a donor for transmitting the second signal; The base station receives the second signal through an optical path, restores the first signals by performing first wavelength division demultiplexing on the received second signal, and performs a second wavelength division demultiplexing of the first signals. And a remote for recovering the signals for each sector, and converting the restored signals to optical / electric conversion and transmitting them to the repeater.

The donor of the present invention for achieving the above objects is to receive at least two signals for each sector of the base station, pre / optical conversion of the received signals for each sector, and the pre / optical conversion signals for each sector Optical signal processing units for generating first signals by first wavelength division multiplexing, and generating a second signal by performing second wavelength division multiplexing on the first signals, and transmitting the generated second signal through one optical path. And a second wavelength division multiplexer.

A remote of the present invention for achieving the above objects is a first wavelength for receiving the second signal through a single optical path, and performing a first wavelength division demultiplexing of the received second signal to recover the first signals And a division multiplexer, and optical signal processing units for performing the second wavelength division demultiplexing on the first signals to recover signals for each sector of the base station, and optically / preconverting the recovered signals to a repeater.

According to an aspect of the present invention, there is provided a method of transmitting and receiving an optical signal, the method comprising: receiving at least two signals for each sector of a base station at a donor, and pre / optically converting the received signals for each sector; Generating first signals by first wavelength division multiplexing the pre / light-converted signals by each sector in the donor and generating a second signal by second wavelength division multiplexing the first signals by the donor; Transmitting the generated second signal through a single optical path, receiving the second signal at a remote location, and performing the first wavelength division demultiplexing on the received second signal to recover the first signals; And performing a second wavelength division demultiplexing of the first signals at the remote to recover a signal for each sector of a base station, and convert the recovered signals to optical / electric Ring includes the step of transmitting to the repeater.

The present invention has the advantage that no additional optical path is required as the number of sectors in the base station increases. In addition, the present invention has the advantage that it is possible to transmit base station sector signals through one optical path.

Hereinafter, with reference to the accompanying drawings, preferred embodiments of the present invention will be described in detail. It should be noted that in the following description, only parts necessary for understanding the operation according to the present invention will be described, and descriptions of other parts will be omitted so as not to distract from the gist of the present invention.

The present invention provides an optical signal transmission and reception system and method that does not require an additional optical path as the number of sectors of a base station increases. In particular, the present invention provides an optical signal transmission and reception system and method that does not require an additional optical path as the number of sectors of the base station increases by transmitting the base station sector signals through different wavelengths through one optical path.

In the following description, the base station sector is divided into three sectors as an example, and the present invention can be applied when the base station cell is divided into at least two sectors. Next, a structure of an optical signal transmission / reception system according to an embodiment of the present invention will be described with reference to FIG. 1.

1 is a view showing the structure of an optical signal transmission and reception system according to an embodiment of the present invention.

Referring to FIG. 1, an optical signal transmission / reception system includes a base station (RAS) 110, a donor 120, a remote 130, and a relay station 140. .

The donor 120 and the remote 130 of the optical signal transmission and reception system are connected through one optical path 100, that is, one optical core.

On the other hand, it is assumed that the base station 110 transmits base station sector signals through the optical path 100. In addition, it is assumed that the sector of the base station 110 is divided into three.

In the case of three base station sectors and two sector-specific signals, all of the base station sector signals are six. In addition, the base station sector signal may further include one reference signal when transmitting a reference signal.

The donor 120 is connected to or included in the base station 110 and is connected to the remote 130 through the optical path 100. The donor 120 converts an electrical signal output for each sector of the base station 110 into an optical signal and transmits the optical signal to the remote 130 through the optical path 100 or receives the optical signal through the optical path 100. The optical signal is converted into an electrical signal and output to the base station 110.

The remote 130 is connected to or included in the repeater 140 and is connected to the donor 120 through the optical path 100. The remote 120 converts an optical signal received through the optical path 100 into an electrical signal and outputs the electrical signal to the repeater 140 or converts an electrical signal output from the repeater 140 into an optical signal and outputs the optical signal. It transmits to the remote 130 through the furnace (100). The remote may be connected to or included in another base station as well as the repeater 140.

In particular, in the present invention, the base station sector signals may be transmitted through a single optical path 100, and the base station sector signals are multiplexed using Wavelength Division Multiplexing (hereinafter, referred to as 'WDM'). do.

For example, the donor 120 and the remote 130 may perform signal multiplexing / demultiplexing using a Coarse Wavelength Division Multiplexing (hereinafter, referred to as CWDM) method. . In addition, a WiBro multiple input multiple output (MIMO) signal may be transmitted and received through, for example, an optical path between the donor 120 and the remote 130.

Next, the structure of the donor will be described with reference to FIG. 2.

2 is a diagram showing the structure of a donor for transmitting an optical signal according to an embodiment of the present invention.

Referring to FIG. 2, donor 120 receives a base station sector signal from base station 100.

The donor 120 may include a multiplexer or a demultiplexer, and the multiplexer and the demultiplexer are, for example, a CWDM scheme.

The second CWDM unit 290 includes a second CWDM multiplexer 291 and a second CWDM demultiplexer 293.

In addition, the donor 120 includes optical signal processing units corresponding to each sector of the base station 100. For example, when the sector of the base station 110 has three sectors, three optical signal processing units are included.

For example, the optical signal processing units may be referred to as an optical transmit / receive unit (hereinafter referred to as an “OTRU”), and will be described based on one optical signal processing unit 200 of the optical signal processing units. Let's do it.

The optical signal processor 200 includes a reference signal transmitter 210, a signal transmitter 230, a signal receiver 260, and a first CWDM unit 280. The first CWDM unit 280 includes a first CWDM multiplexer 281 and a first CWDM demultiplexer 283.

The reference signal transmitter 210 processes and transmits a reference signal. The reference signal transmitter 210 is included in one of a plurality of optical signal processors. The reference signal transmitter 210 includes an automatic signal level controller 211 and an electro-optical converter 213. The reference signal input from the base station 110 is 10 MHz, and only one reference signal is transmitted within the donor 120 through the all-optical converter 213.

The automatic signal level controller 211 automatically controls the signal level of the reference signal output from the base station 110. The all-optical converter 213 converts a reference signal having the automatically controlled signal level into an optical signal.

The signal transmitter 230 includes signal level detectors 231 and 233, signal level regulators 235 and 237, amplifiers 239 and 241, and pre / optical converters 243 and 245. It includes.

The signal level detectors 231 and 233, the signal level regulators 235 and 237, the amplifiers 239 and 241, and the optical / optical converters 243 and 245 are each of the base station 110. It corresponds to the number of each input signal of the sector. Since the number of input signals of each base station sector is two, the signal level detectors 231 and 233, the signal level regulators 235 and 237, the amplifiers 239 and 241, and the pre / optical converters 243. , 245). For example, the signal level of the forward signal input from the base station 110 is -20 ~ -45dBm / FA.

The signal level detector 231 detects a signal level of a signal received from each sector of the base station 110. The signal level adjuster 235 adjusts the signal level to correspond to a preset level. The signal level adjuster 235 adjusts the input signal to 0 to 15dB by adjusting a 1dB step digital attenuator so that a signal having an appropriate signal strength can be applied to the pre / optical converter 245 even with a change in the input signal. Adjust the signal so that The amplifier 239 power amplifies the signal whose signal level is adjusted. The signal level detector 231 and the signal level regulator 235 may be included in the amplifier 239. The all-optical converter 243 converts the power amplified signal into an optical signal and outputs the converted signal to the first CWDM unit 280.

The first CWDM multiplexer 281 multiplexes a sector-specific signal converted into the optical signal by a CWDM method and outputs the signal to the second CWDM unit 290.

The second CWDM multiplexer 291 multiplexes the signals for each sector of the CWDM multiplexed by the CWDM scheme and transmits the signals to the remote.

The first CWDM multiplexer 281 and the second CWDM multiplexer 291 perform CWDM multiplexing so that each of the multiplexed signals has a different wavelength.

When the signal level detector 231, the signal level adjuster 235, the amplifier 239, and the pre / optical converter 241 process the first signal received in each sector, the signal level detector 233 The signal level adjuster 237, the amplifier 241, and the pre / optical converter 245 transmit the second signal received in each sector to the signal level detector 231, the signal level adjuster 235, and the The amplifier 239 performs the same operation as the pre / optical converter 241 and outputs the same to the first CWDM multiplexer 281.

Meanwhile, the second CWDM demultiplexer 293 demultiplexes the signal received through the optical path 100 in a CWDM manner and outputs the demultiplexed signal to the first CWDM unit 280.

The first CWDM demultiplexer 283 receives a signal of a corresponding sector among the demultiplexed signals, demultiplexes the received signal by a CWDM method, and outputs the signal to the signal receiver 260.

The second CWDM demultiplexer 293 and the first CWDM demultiplexer 283 reconstruct each of the signals having different wavelengths.

The signal receiver 260 includes optical compensators 261 and 263, amplifiers 265 and 267, and optical / electrical converters 269 and 271.

The photoelectric converter 269 converts the demultiplexed sector-specific signal into an electrical signal. The amplifier 265 power amplifies the signal converted into the electrical signal. The optical compensator 261 compensates the optical signal and outputs the optical signal to the base station 110. The optical compensator 261 may be included in the amplifier 265. The optical compensator 261 measures a loss for an optical line section, and adjusts the signal amplified by the amplifier 265 to 0 to 10 dB by adjusting a 1 dB step digital attenuator to have a constant signal strength. Adjust

Here again, the optical compensators 261 and 263, the amplifiers 265 and 267, and the optical / electric converters 269 and 271 correspond to the number of received signals for each sector. Since there are two sector-specific received signals received through the optical path 100, the optical compensators 261 and 263, the amplifiers 265 and 267, and the optical / electrical converters 269 and 271 are two. do.

When the optical compensator 261, the amplifier 265, and the opto-electric converter 269 process the first received signal output from the first CWDM demultiplexer 283, the optical compensator 261, the The amplifier 265 and the opto-electric converter 269 transmit a second received signal output from the first CWDM demultiplexer 283 to the optical compensator 261, the amplifier 265, and the opto-electric converter. 269) and outputs the same to the base station 110.

As described above, when there are two transmission signals transmitted in each sector of the base station 110 and two signals received in each sector, the optical signal processing units included in the donor 120 each have two transmission signals and two transmission signals. Process two received signals. In addition, one of the optical signal processing units further transmits a reference signal.

The optical signal output from the second CWDM multiplexer 291 of the second CWDM unit 290 is transmitted through one optical path (1-Core) 100, and the optical signal received from the remote is also one optical beam. Received through the furnace (100).

Next, the structure of the remote will be described with reference to FIG. 3.

3 is a diagram illustrating the structure of a remote receiving optical signal according to an embodiment of the present invention.

Referring to FIG. 3, the remote 130 receives an optical signal from the donor through the optical path 100.

The remote 130 may include a demultiplexer or a multiplexer, and the demultiplexer and the multiplexer are, for example, a CWDM scheme.

The first CWDM unit 310 includes a first CWDM demultiplexer 311 and a first CWDM multiplexer 313.

The first CWDM demultiplexer 313 demultiplexes the signals for each sector multiplexed to different wavelengths through the optical path 100 by the CWDM method to restore the signals for each sector, and then, to the second CWDM unit 320. Output

On the other hand, the remote 130 receives the optical signal corresponding to each sector of the base station and outputs to the repeater 140. The remote 130 receives the base station sector signal. For example, if there are three sectors of the base station, the base station includes three optical signal processing units for receiving sector-specific signals.

For example, the optical signal processing units may be referred to as OTRUs and will be described based on the optical signal processing unit 300 of one of the optical signal processing units.

The optical signal processor 300 includes a second CWDM unit 320, a reference signal receiver 330, a signal receiver 340, and a signal transmitter 360. The second CWDM unit 320 includes a second CWDM demultiplexer 321 and a second CWDM multiplexer 323.

The second CWDM demultiplexer 313 receives the demultiplexed signal from the first CWDM demultiplexer 321, and demultiplexes the signals for each sector multiplexed with different wavelengths by the CWDM method to restore the signals in the sectors. do.

In addition, the first CWDM demultiplexer 321 outputs a sector-specific signal including a reference signal among the base station sector signals to the CWDM unit of the optical signal processor including a reference signal receiver for processing the reference signal. In this case, when the optical signal processor including the reference signal processor is the optical signal processor 300, the sector-specific signal including the reference signal is output to the second CWDM demultiplexer 313. The reference signal received at the remote 130 is 10 MHz, and only one reference signal is received alone through the all-optical converter 330.

The reference signal receiver 330 receives and processes a reference signal. The reference signal receiver 330 is included in one of a plurality of optical signal processors. The reference signal receiver 330 includes an optical / electric converter 331 and an automatic gain controller 333.

The photoelectric converter 331 converts a reference signal into an electrical signal. The automatic gain controller 333 controls the gain of the reference signal converted into an electrical signal.

The signal receiver 340 includes optoelectric converters 341 and 343, amplifiers 345 and 347, and optical compensators 349 and 351.

The opto-electric converters 341 and 343, the amplifiers 345 and 347, and the optical compensators 349 and 351 are each a number of input signals of each sector of the base station or an optical signal processor module of the donor. Corresponds to the number of each of them. If the number of input signals or the number of optical signal processing modules of each sector of the base station is two, the optical / electric converters 341 and 343, the amplifiers 345 and 347, and the optical compensators 349. , 351 are two each.

The photoelectric converter 331 converts the demultiplexed signal from the second CWDM demultiplexer 321 into an electrical signal. The amplifier 345 power amplifies the electrical signal. The optical compensator 349 compensates and outputs the electrical signal to the repeater 140 so that the electrical signal has a preset signal level.

The photoelectric converter 341 converts the demultiplexed signal into an electrical signal by the second CWDM demultiplexer 321. The amplifier 345 amplifies the electrical signal. The optical compensator 349 measures the loss of the optical line section, and adjusts the signal amplified by the amplifier 265 to 0 to 10 dB by adjusting a 1 dB step digital attenuator to have a constant signal strength. Adjust

In addition, when the opto-electric converter 341, the amplifier 345, and the optical compensator 349 process the first signal demultiplexed by the second CWDM demultiplexer 321, the opto-electric converter ( 343), the amplifier 347 and the optical compensator 351 transmit the second signal demultiplexed by the second CWDM demultiplexer 321 to the optical / electric converter 331, the amplifier 345, and the optical signal. The same operation as the compensator 349 is performed and output to the repeater 140.

The signal transmitter 360 includes all-optical converters 361 and 363 and amplifiers 365 and 367.

The amplifier 365 receives the signal of the repeater 140 and amplifies the received signal. The all-optical converter 361 converts the power amplified signal into an optical signal and outputs the converted signal to the second CWDM multiplexer 323.

When the amplifier 365 and the all-optical converter 361 process the first transmission signal of the repeater 140, the amplifier 367 and the all-optical converter 363 are the second of the repeater 140. The transmission signal is output to the second CWDM multiplexer 323 by performing the same operation as that of the amplifier 365 and the all-optical converter 361.

The second CWDM multiplexer 323 multiplexes the CWDM scheme and outputs the multiplexed to the first CWDM unit 310.

The first CWDM multiplexer 313 multiplexes the optical signals output from the optical signal processing units by a CWDM method and transmits them to the donor through one optical path 100.

Here, as described above, when there are two received signals received in each sector of the repeater 140, and there are two signals transmitted by the repeater 140, the optical signal processing units included in the remote may each have two received signals. And two transmission signals, and one of the optical signal processors further processes one reference signal received.

On the other hand, the amplifiers used in the donor and the remote may be, for example, a driving amplifier (Drivie Amp).

Next, the operation of the donor transmitting a signal through one optical path will be described with reference to FIG. 4.

4 is a flowchart illustrating an operation of a donor for transmitting an optical signal according to an embodiment of the present invention.

Referring to FIG. 4, in step 411, the donor receives a signal of one sector of each sector of the base station and checks whether a reference signal is included in the signal of the received sector.

If the reference signal is included in the received sector signal, the process proceeds to step 413.

In step 413, the donor automatically controls the signal level of the reference signal, and proceeds to step 421. The signal level unit of the reference signal may be, for example, Hertz (Hz), and may be, for example, 10 MHz, 100 MHz, or the like.

If the reference signal is not included in the received sector signal, the process proceeds to step 415.

In step 415, the donor detects a signal level of a transmission signal and proceeds to step 417. The transmission signal is a transmission signal transmitted in each sector, and the transmission signal is at least two in each sector.

In step 417, the donor adjusts the signal level to a preset level and proceeds to step 419.

In step 419, the donor amplifies the level adjusted signals and proceeds to step 421.

In step 421, the donor converts the reference signal and the amplified transmission signals whose signal levels are automatically controlled into optical signals, and proceeds to step 423.

In step 423, the donor performs first wavelength division multiplexing on the signals converted into the optical signal and proceeds to step 425. The donor performs wavelength division multiplexing on signals in a sector through the first wavelength division multiplexing.

In step 425, the donor performs second wavelength division multiplexing on the first wavelength division multiplexed signal for each sector and proceeds to step 427. The donor performs wavelength division multiplexing on signals in each sector through the second wavelength division multiplexing.

For example, it is assumed that the wavelength division multiplexing method performed in steps 423 and 425 uses a CWDM method.

In step 427, the donor transmits the second wavelength division multiplexed signal through one optical path.

Next, the operation of the remote receiving the signal through one optical path will be described with reference to FIG. 5.

5 is a flowchart illustrating the operation of a remote to receive an optical signal according to an embodiment of the present invention.

Referring to FIG. 5, in step 501, the remote receives a signal through one optical path and proceeds to step 513.

In step 513, the remote performs first wavelength division demultiplexing on the received signal and proceeds to step 515. The remote wavelength division demultiplexing signal for each sector transmitted from the base station through the first wavelength division demultiplexing.

In step 515, the remote performs second wavelength division demultiplexing on the first wavelength division demultiplexing signal and proceeds to step 517. The remote wavelength division demultiplexes the signals in each sector through the second wavelength division demultiplexing.

For example, it is assumed that the wavelength division demultiplexing method performed in steps 513 and 515 uses a CWDM method. Accordingly, the first wavelength division demultiplexing and the second wavelength division demultiplexing may restore signals and reference signals in each sector of the base station.

In step 517, the remote checks whether the restored signal is a reference signal.

If the restored signal is the reference signal, the process proceeds to step 521.

In step 521, the remote automatically controls the signal level of the reference signal and ends.

If the restored signal is not the reference signal as a result of the checking, step 523 is performed.

In step 523, the remote amplifies signals other than the reference signal and proceeds to step 525.

In step 525, the remote optically compensates the amplified signal.

Alternatively, the remote may transmit a signal to the donor. In this case, the remote amplifies the transmission signal transmitted from the repeater. The remote pre / optically converts the power amplified signal and performs a first CWDM multiplexing of the all-optically transmitted transmission signals. The remote transmits the first CWDM multiplexed signals from the plurality of optical signal processing units to the donor by performing the second CWDM multiplexing.

The donor receives a signal transmitted from the remote through a single optical path, performs first CWDM demultiplexing, and outputs the signal to the optical signal processing units. The first CWDM demultiplexed signals are signals for each sector. The donor performs a second CWDM multiplexing of the signals on which the first CWDM multiplexing is performed. The second CWDM demultiplexed signals are individual signals in each sector. The donor photo / preconverts and power amplifies the signals on which the second CWDM demultiplexing is performed. The donor photocompensates the power amplified signal and outputs the signal to the base station.

Meanwhile, in the detailed description of the present invention, specific embodiments have been described, but various modifications may be made without departing from the spirit of the present invention. Therefore, the scope of the present invention should not be limited to the embodiments described, but it is natural that the scope of the claims extends to the equivalent scope of the claims as well as the claims to be described later.

1 is a view showing the structure of an optical signal transmission and reception system according to an embodiment of the present invention;

2 is a diagram showing the structure of a donor transmitting an optical signal according to an embodiment of the present invention;

3 is a diagram showing the structure of a remote receiving optical signal according to an embodiment of the present invention;

4 is a flowchart illustrating an operation of a donor for transmitting an optical signal according to an embodiment of the present invention;

5 is a flow chart illustrating operation of a remote receiving optical signal according to an embodiment of the present invention.

Claims (25)

In the optical signal transmission system, Receiving at least two signals for each sector of the base station, pre / optically converting the received signals for each sector, and generating first signals by first wavelength division multiplexing the pre / optically converted signals for each sector; A donor configured to generate a second signal by performing second wavelength division multiplexing on the first signals and to transmit the second signal; Receiving the second signal through one optical path, performing first wavelength division demultiplexing on the received second signal to restore the first signals, and performing second wavelength division demultiplexing on the first signals. And a remote to restore signals for each sector of the base station sector, and convert the restored signals to optical / electric conversion and transmit them to a repeater. Receiving at least two signals for each sector of the base station, pre / optically converting the received signals for each sector, and generating first signals by first wavelength division multiplexing the pre / optically converted signals for each sector; Optical signal processing units, And a second wavelength division multiplexer for generating a second signal by second wavelength division multiplexing the first signals, and transmitting the generated second signal through one optical path. The method of claim 2, The optical signal processor; A signal transmitter for receiving at least two signals for each sector and pre / optical converting the received signals for each sector; And a first wavelength division multiplexer for first wavelength division multiplexing the pre / light converted signals for each sector. The method of claim 3, wherein The signal transmitter; Signal level detectors for detecting one signal level of each sector-specific signal; Signal level adjusters for adjusting a signal level corresponding to the detected input level; Amplifiers for power amplifying the signal at which the signal level is adjusted; And all-optical converters for converting the power amplified signal. The method of claim 3, wherein At least one of the optical signal processing units includes a reference signal processing unit for receiving a reference signal, pre / optical converting the reference signal, and generating a first signal by first wavelength division multiplexing the pre / optical converted signal. donor. The method of claim 3, wherein The reference signal processor; An automatic signal level controller for automatically controlling the signal level of the reference signal; And an all-optical converter for converting the signal whose signal level is automatically controlled. The method of claim 3, wherein The donor further includes a first wavelength division demultiplexer configured to receive the fourth signal through a single optical path and perform first wavelength division demultiplexing on the received fourth signal to restore the third signals. . The method of claim 7, wherein The optical signal processing units; A second wavelength division demultiplexer configured to perform second wavelength division demultiplexing on the third signals to restore signals for each sector transmitted from a relay station; And a signal receiver for optically / preconverting the restored signals and transmitting the converted signals to a base station. The method of claim 8, The signal receiving unit; Optical / electric converters for optically / preconverting the recovered signals; Amplifiers for power amplifying the opto / pre-converted signals; A donor comprising optical compensators for optically compensating the power amplified signals. A first wavelength division multiplexer for receiving the second signal through one optical path and reconstructing the first signals by performing first wavelength division demultiplexing on the received second signal; And an optical signal processing unit configured to perform the second wavelength division demultiplexing on the first signals to recover signals for each sector of the base station, and to optically / preconvert the restored signals and transmit the converted signals to a repeater. The method of claim 10, The optical signal processor; A second wavelength division demultiplexer for restoring a signal for each sector of the base station by performing a second wavelength division demultiplexing on the first signals; And a signal receiver for optically / electrically converting the restored signal and transmitting the converted signal to a repeater. The method of claim 11, The signal receiving unit; Optical / electric converters for optically / preconverting the recovered signals; Amplifiers for power amplifying the opto / pre-converted signals; And remote compensators for optically compensating the power amplified signals. The method of claim 10, At least one of the optical signal processing units includes a reference signal processing unit for receiving a reference signal included in a first signal, optically / preconverting the received reference signal, and outputting the optical / preconverted signal to a relay station. Remote. The method of claim 13, The reference signal processor; An optical / electric converter for optically / preconverting a reference signal, And an automatic signal level controller for automatically controlling a signal level of the optical / electrically converted signal. The method of claim 10, The optical signal processing units; A signal transmitter for receiving at least two signals to be transmitted for each sector of the base station from the relay station and pre / optically converting the received signals for each sector; And a first wavelength division multiplexer for generating third signals by performing first wavelength division multiplexing on the pre / optically converted signals for each sector. The method of claim 15, The signal transmitter; Amplifiers for receiving at least two signals to be transmitted for each sector of the base station from the relay station and for power amplifying the received signals; And an all-optical converter for converting the power amplified signal for each sector. The method of claim 16, And the remote further comprises a second wavelength division multiplexer for wavelength division multiplexing the third signals to generate a fourth signal and transmitting the fourth signal through one optical path. In the optical signal transmission and reception method, Receiving at least two signals for each sector of the base station at the donor and pre / optical converting the received signals for each sector; Generating first signals by first wavelength division multiplexing the pre / light-converted signals by each sector in the donor, and generating a second signal by second wavelength division multiplexing the first signals; Transmitting the generated second signal through one optical path in the donor; Receiving the second signal at a remote and performing first wavelength division demultiplexing on the received second signal to recover the first signals; And performing a second wavelength division demultiplexing of the first signals at the remote to recover a signal for each sector of a base station, and converting the restored signals to optical / electric conversion and transmitting the signals to a repeater. The method of claim 18, The pre / light conversion step; And amplifying the input levels of the signals received for each sector of the base station, and converting the amplified signals to the pre / optical conversion. The method of claim 18, The first wavelength division multiplexing and the second wavelength division multiplexing are multiplexing using a low density wavelength division multiplexing scheme, and the first wavelength division demultiplexing and the second wavelength division demultiplexing are demultiplexing using a low density wavelength division multiplexing scheme. Optical signal transmission and reception method characterized in that. The method of claim 18, Optically / electrically converting the restored signals and transmitting them to a repeater; Optically / preconverting the recovered signals; Power amplifying the photo / pre-converted signals; Optically compensating the power amplified signals and transmitting the optically amplified signals to a repeater. The method of claim 18, And one first signal of the first signals comprises a reference signal. The method of claim 22, Automatically controlling the signal level of the reference signal in the donor and converting the light into full and light; The optical signal transmission and reception method further comprising the step of automatically controlling the signal level of the reference signal in the remote / pre-conversion. The method of claim 18, Receiving at least two signals to be transmitted for each sector of the base station from the relay station at the remote, and pre / optically converting the received signals for each sector; Generating third signals by first wavelength division multiplexing the pre / optically converted signals at each remote by the sector, and generating a fourth signal by wavelength division multiplexing the third signals; Transmitting the fourth signal from the remote to a donor through a single optical path; Receiving the fourth signal at the donor and performing first wavelength division demultiplexing on the received fourth signal to recover the third signals; And performing a second wavelength division demultiplexing on the third signals in the donor to recover signals for each sector transmitted from a relay station, and optically / preconverting the recovered signals to transmit to the base station. How to send and receive. The method of claim 24, Amplifying the received signals at the remote and pre / optical converting the amplified signals; And amplifying, compensating, and transmitting the optical / pre-converted signals in the donor to a base station.

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