KR100968926B1 - Optical repeating system for multiple band at mobile telecommunication network - Google Patents

Abstract

A multi-band optical relay system in mobile communication is provided, and more specifically, a multi-band optical relay system using a single optical line and having an antenna power feed structure of a matrix structure is provided.

The multi-band optical relay system combines a plurality of downlink radio frequency (RF) signals having respective service bands to generate a downlink optical signal including a plurality of service bands and the generated downlink optical signal. And converts the plurality of downlink RF signals having respective service bands into a plurality of downlink RF signals, mixes the converted downlink RF signals using a matrix feeding circuit, and converts the mixed downlink RF signals through a plurality of antennas. And a remote unit that emits.

Optical relay

Description

OPTICAL REPEATING SYSTEM FOR MULTIPLE BAND AT MOBILE TELECOMMUNICATION NETWORK}

The present invention relates to a multi-band optical relay system in mobile communication, and more particularly, to a multi-band optical relay system using a single optical line and having an antenna power feed structure of a matrix structure.

1 is a block diagram showing the configuration of an optical relay device according to the prior art.

In the optical relay device according to the prior art, the master units 11a, 11b, 11c, and 11d each provide a downlink RF signal having an A service band, a B service band, a C service band, and a D service band, respectively. It receives and converts the optical signal, and transmits the converted optical signal to the slave units 12a, 12b, 12c, and 12d located at remote locations. In addition, the master units 11a, 11b, 11c, and 11d are the uplink optical signals having the A service band, the B service band, the C service band, and the D service band, respectively, from the slave units 12a, 12b, 12c, and 12d. receive and convert an uplink optical signal into an RF signal.

The slave units 12a, 12b, 12c, and 12d convert the received optical signal into an RF signal and radiate the converted RF signal through the antenna 13. In addition, the slave units 12a, 12b, 12c, and 12d receive an uplink signal, which is an RF signal received by the antennas 13a, 13b, 13c, and 13d, convert it into an optical signal, and convert the optical signal through an optical line. Send the signal to master units 11a, 11b, 11c and 11d.

In the case of the optical relay device according to the related art, each relay device must be installed to transmit a base station (BTS) signal having a different frequency band, thereby increasing the cost. do. In addition, since an optical line is required for each unit between the master unit and the slave unit, an increase in the optical line cost or laying cost or the like occurs. In addition, since there is only one antenna of each slave unit, when the optical repeater is installed in an area with many obstacles or inside the building, it is difficult to evenly reach the radio wave over a large area due to the radio wave attenuation according to the distance. There is this.

In order to solve this problem, the optical relay device of the prior art used the antenna distributed installation method.

2 is a block diagram showing the configuration of an optical relay apparatus using a distributed antenna installation according to the prior art.

In the optical relay apparatus using the antenna dispersion installation of the prior art, the RF signal converted from the optical signal by the slave unit 22 is separated into a plurality of RF signals by a divider 23, and the separated RF signal is Radiated through the distributed antenna 24.

In addition, the uplink RF signal received by the antenna 24 is combined into one signal by the splitter 23, and the combined RF signal is converted into an optical signal by the slave unit 22 and is converted into an optical signal through a master unit. Is sent to 21.

In the case of the optical relay device according to the related art, each relay device must be installed in order to transmit a base station (BTS) signal having a different frequency band, thereby increasing the cost. In addition, since an optical line necessary for optical signals to be transmitted and received between the master unit and the slave unit is required for each unit, an increase in the optical line cost or installation cost or the like occurs. Moreover, there was a problem that the antenna cost and the installation cost were further increased by the number of antennas increased by the distributor 23.

In order to solve this problem, an optical relay apparatus using a combiner as well as a distributor has been proposed.

FIG. 3 is a block diagram illustrating a configuration of an optical relay apparatus in which antennas are distributed by using a combiner and a divider according to the related art.

In the optical relay device according to the related art shown in FIG. 3, the slave unit 32 converts a downlink optical signal received from the master unit 31 through an optical line into an RF signal to a combiner 33. send. The combiner 33 receives RF signals of different service bands, for example, A band, B band, C band, and D band, combines them into one signal, and transmits the combined signals to the divider 34. The distributor 34 separates the received signal and radiates the separated signal through the antenna 35.

In addition, the uplink RF signal received by the antenna 35 is transmitted to the slave unit 33 belonging to each service band through the distributor 34 and the combiner 33. The uplink RF signal is converted into an optical signal by the slave unit 33 and transmitted to the master unit 31 via the optical line.

In the case of the optical relay device according to the prior art, even in the case of the optical relay device according to the prior art, the number of antennas required by using the combiner and the divider is reduced, and thus the cost can be reduced.

However, since each relay device must still be installed to transmit a base station (BTS) signal having each different frequency band, the cost is increased. In addition, since an optical line necessary for optical signals to be transmitted and received between the master unit and the slave unit is required for each unit, an increase in the optical line cost or installation cost or the like occurs.

In particular, the use of combiners and dividers results in power losses. More specifically, since a combiner is used to combine the RF signals belonging to four different service bands, a loss of 6 dB (= 10 x log 4) occurs. In addition, since a divider is used to feed the combined signal to the four antennas, a loss of 6 dB (= 10 x log 4) occurs.

That is, a loss of 12 dB per unit antenna is generated, and thus, the total power is reduced, thereby reducing the distance that the radio waves can reach.

4 is a block diagram illustrating a configuration of an optical module device included in a master unit and a slave unit according to the related art.

The master unit side amplifier 42 included in the master unit side optical module 41 receives a downlink RF signal, amplifies the received signal to an appropriate level, and transmits the received signal to a laser diode (LD) 43. . The laser diode (LD) 43 converts the received RF signal into an optical signal and transmits the converted optical signal to the slave unit optical module 44 through the optical line.

A photo diode (PD) 45 included in the optical module 44 of the slave unit converts the optical signal received from the master unit optical module 41 into an RF signal. The attenuation circuit 46 controls the level of the converted RF signal, and the slave unit side amplifier 47 amplifies and outputs the level controlled RF signal.

On the other hand, in the case of the uplink signal processing, only the downlink and the direction are different, and the same processing is performed.

5 is a block diagram showing the configuration of an optical module device using a wavelength division multiplexer according to the prior art.

The optical module device 50, 51 according to the prior art shown in FIG. 5 further includes wavelength division multiplexers 52, 53 to wavelength split and multiplex the uplink and downlink optical signals, thereby providing a single light. It transmits and receives an optical signal between a master unit and a slave unit via a line.

4 and 5, the RF signal input to the optical module device is amplified by an amplifier included in the optical module device. In this case, since the ratio amplified by the amplifier differs according to the frequency of the input signal, the pass frequency is determined according to the frequency specification of the amplifier to be used. Due to these characteristics, there is a problem that the optical module device according to the prior art is not suitable for the wide band characteristics.

An embodiment of the present invention is to provide an optical relay apparatus that improves line use efficiency using a single optical line and provides an effective service in multiple bands using an antenna power feed structure of a matrix structure.

As a technical means for achieving the above technical problem, an embodiment of the present invention controls the levels of a plurality of downlink radio frequency (RF) signals having respective service bands, and then includes a plurality of service bands in combination. A host unit for generating a downlink optical signal and the generated downlink optical signal are separated and converted into a plurality of downlink RF signals having respective service bands, and using a feeding circuit including a hybrid coupler having a matrix structure. It is possible to provide a multi-band optical relay system including a remote unit for mixing the converted downlink RF signal, and emits the mixed downlink RF signal through a plurality of antennas.

In addition, an embodiment of the present invention is a band module including an attenuator and an amplifier for controlling the level of a plurality of downlink RF signal having a respective service band, a plurality of level controlled downlink RF signal by combining a plurality of A combiner for generating a downlink RF signal having a service band, an optical module for converting a downlink RF signal having the plurality of service bands to a downlink optical signal having a plurality of service bands, and between the band module and the optical module A downlink optical signal having a plurality of service bands, wherein the downlink optical signal is connected to at least one remote unit of the multi-band optical relay system, wherein the optical module includes a plurality of service bands from the at least one remote unit. Converts an uplink optical signal having a plurality of signals to an uplink RF signal having a plurality of service bands. The splitter divides the RF signal having the plurality of service bands into a plurality of uplink RF signals having each service band, and the band module attenuates and amplifies the uplink RF signal having the respective service band. And a host unit of the multi-band optical relay system that performs at least one of the band filters.

In addition, an embodiment of the present invention is an optical module for converting a downlink optical signal having a plurality of service bands received from a host unit to a downlink RF signal having a plurality of service bands, the downlink having a plurality of service bands A splitter for splitting an RF signal into a plurality of downlink RF signals having respective service bands, and performing signal processing of at least one of attenuation, amplification, and band filtering on the downlink RF signals having each service band. A downlink radio frequency (RF) module, an antenna feed circuit for mixing the signal-processed downlink RF signal through a feed circuit including a hybrid coupler of a matrix structure and supplying the antenna to a plurality of uplinks having respective service bands Perform signal processing on at least one of attenuation, amplification, and bandpass on the RF signal. An uplink RF module and a combiner for combining the signal-processed uplink RF signal into an uplink RF signal having a plurality of service bands, wherein the downlink optical signal received from the host unit is converted into an optical signal Level control is performed in the state of the RF signal before the operation, wherein the optical module converts an uplink RF signal having the plurality of service bands into an uplink optical signal having the plurality of service bands and transmits the signal to the host unit. It is possible to provide a remote unit of a multi-band optical relay system.

According to the above-described problem solution means of the present invention, it is possible to transmit and receive a multi-band signal through a single optical line to increase the line use efficiency.

In addition, according to the above-described problem solving means of the present invention, by using a antenna feeding circuit of the matrix structure using a hybrid coupler it is possible to implement a low loss of power distribution to increase the utilization efficiency of the antenna.

DETAILED DESCRIPTION Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art may easily implement the present invention. As those skilled in the art would realize, the described embodiments may be modified in various different ways, all without departing from the spirit or scope of the present invention. In the drawings, parts irrelevant to the description are omitted in order to clearly describe the present invention, and like reference numerals designate like parts throughout the specification.

Throughout the specification, when a part is "connected" to another part, this includes not only "directly connected" but also "electrically connected" with another element in between. . In addition, when a part is said to "include" a certain component, which means that it may further include other components, except to exclude other components unless otherwise stated.

6 is a block diagram showing the configuration of a multi-band optical relay system according to an embodiment of the present invention.

The multi-band optical relay system according to an embodiment of the present invention includes a host unit 100 and a remote unit 200.

The host unit 100 receives four uplink signals each including a plurality of service bands, that is, A band, B band, C band, and D band, from different base stations. The downlink signal received by the host unit 100 is a radio frequency (RF) signal. The host unit 100 modulates and combines the received four downlink RF signals into one downlink optical signal including the A band, the B band, the C band, and the D band, and converts all the downlink RF signals into an downlink optical signal. The link optical signal is transmitted to the remote unit 200 through the optical line.

In addition, the host unit 100 receives an uplink optical signal including the A band, the B band, the C band, and the D band from the remote unit 200. The host unit 100 demodulates and separates the received uplink optical signal, and photoelectrically converts the received uplink optical signal into an uplink RF signal including respective service bands, that is, A, B, C, and D bands. The converted uplink RF signal is transmitted to the base station.

The remote unit 200 receives a downlink optical signal including the A band, the B band, the C band, and the D band from the host unit 100. The remote unit 200 demodulates and separates the received downlink optical signal into four downlink RF signals each including one service band, that is, A band, B band, C band, and D band, and the converted Four downlink RF signals are radiated through one antenna.

In addition, the remote unit 200 receives four uplink RF signals each including one or more service bands, that is, A band, B band, C band, and D band, through the antenna. The remote unit 200 modulates and combines the received uplink RF signal into one uplink optical signal including A band, B band, C band, and D band, and converts the uplink RF signal through an optical path. The optical signal is transmitted to the host unit 100.

Although only one remote unit 200 is illustrated in FIG. 6, a plurality of remote units 200 may be connected to the host unit.

7 is a block diagram illustrating a configuration of a host unit according to an embodiment of the present invention.

The host unit 100 according to an embodiment of the present invention may include a band module 110, a downlink signal combiner 120a, an uplink signal divider 120b, a downlink signal divider 130a, and an uplink. Signal coupler 130b and a plurality of optical modules 140.

The host unit 100 may receive four types of downlink RF signals having different service bands from the base station, and may similarly transmit four types of uplink RF signals having different service bands to the base station. As such, the signal transmitted from the host unit 100 to the base station and received from the base station is an RF signal.

The band module 110 receives four downlink RF signals each including an A band, a B band, a C band, and a D band from a base station, and performs a signal such as band filtering, attenuation, or amplification on the received signal. The process is performed and transmitted to the downlink combiner 120a.

The downlink signal combiner 120a receives four downlink RF signals including the A band, the B band, the C band, and the D band received from the band module 110, respectively. Combine all in one downlink RF signal. The downlink signal combiner 120a transmits the combined downlink RF signal to the downlink signal splitter 130a.

The downlink signal splitter 130a receives a downlink RF signal including all of the A, B, C, and D bands, and separates the received downlink RF signal into eight downlink RF signals to provide eight optical signals. Send to module 140. As described above, the downlink RF signal transmitted by the downlink signal splitter 130a to the optical module 140a includes signals of the A band, the B band, the C band, and the D band.

The optical module 140a modulates and separates the downlink RF signal received from the downlink signal splitter 130a into four downlink optical signals including A band, B band, C band, and D band. The downlink optical signal is transmitted to four remote units (not shown) through the optical line.

Hereinafter, the uplink processing operation will be described.

The optical module 140b receives an uplink optical signal including all of the A band, the B band, the C band, and the D band from a remote unit (not shown). The optical module 140b converts the received uplink optical signal into an uplink RF signal and transmits the converted uplink RF signal to the uplink signal combiner 130b.

The uplink signal combiner 130b combines the uplink RF signals received from the eight optical modules 140 into one uplink RF signal and transmits them to the uplink signal splitter 120b.

The uplink signal splitter 120b separates the uplink RF signal including all of the A band, the B band, the C band, and the D band received from the uplink signal combiner 130b for each band. That is, the uplink signal splitter 120b divides the received uplink RF signal into four uplink RF signals each including an A band, a B band, a C band, and a D band, and divides the separated uplink RF signal into A. Transmission to the band module 110 corresponding to the band, B band, C band and D band.

The band module 110 receives an uplink RF signal including an A band, a B band, a C band, and a D band from the uplink signal splitter 120b, and performs band filtering on the received uplink RF signal. Signal processing such as attenuation or amplification is performed to the base station.

As such, the host unit combines and modulates four downlink RF signals received from base stations of four different service bands to convert one downlink optical signal including all bands, and downlinks. The link combiner 120a, the downlink splitter 130a, and the optical module are used to transmit downlink optical signals including all bands to 32 remote units.

In addition, an uplink optical signal including all of the A, B, C, and D bands received from the remote unit is converted into an uplink RF signal, and includes the A, B, C, and D bands, respectively. It is separated into an uplink RF signal and transmitted to each base station.

In the embodiment illustrated in FIG. 7, four and eight paths are used for the coupler and distributor, but various types of couplers and distributors may be used as needed. In addition, the combiner 120a and the divider 120b may be implemented as a single device to perform combining and distributing according to the direction of the signal. Similarly, divider 130a and combiner 130b may also be implemented as one device to perform distribution and combining according to the direction of the signal.

8 is a block diagram showing the configuration of a band module according to an embodiment of the present invention.

The band module 110 according to the embodiment of the present invention includes a duplexer 111, attenuators 112a and 112b, amplifiers 113a and 113b, and filters 114a and 114b.

The downlink RF signal and the uplink RF signal received by the band module 110 are separated into downlink and uplink signals through the duplexer 111, and pass through the attenuators 112a and 112b and the amplifiers 113a and 113b. Attenuated or amplified to an appropriate level, and band filtered by the filters 114a and 114b. The downlink RF signal attenuated, amplified and band filtered by the band module 110 is output to a combiner and a divider (not shown), and the uplink RF signal is output to the base station.

Unlike the amplifier and attenuator used in the optical module in the prior art, in one embodiment of the present invention, since the amplification and attenuation of the downlink signal and the uplink signal are performed in the state of being an RF signal in the band module rather than the optical module. In addition, the optical signal output from the optical module can be transmitted in a wide band without being affected by the amplification element.

In addition, versatility can be ensured because amplification, attenuation and band filtration are performed in the band module separately from the optical module.

9 is a block diagram showing the configuration of a remote unit according to an embodiment of the present invention.

The remote unit 200 according to an embodiment of the present invention includes an optical module 210, a downlink signal splitter 220a, an uplink signal combiner 220b, a downlink RF module 230a, and an uplink RF module 230b. ), A duplexer 240, an antenna power feed circuit 250, and antennas 260a, 260b, 260c and 260d.

The optical module 210 receives a downlink optical signal including all A band, B band, C band, and D band from a host unit (not shown) and converts the downlink optical signal into a downlink RF signal.

The downlink signal splitter 220a separates the downlink RF signal received from the optical module 210 for each band included in the downlink signal to thereby separate the A band downlink RF signal, the B band downlink RF signal, and the C band downlink. Separate into RF signal and D band downlink RF signal.

The downlink RF module 230a band-filters each downlink RF signal separated by the downlink signal splitter 220a, amplifies or attenuates to an appropriate level, and transmits the same to the duplexer 240.

The duplexer 240 divides the RF signal received from the downlink RF module 230a and the antenna power supply circuit 250 into a downlink signal and an uplink signal, respectively, to the antenna power supply circuit 250 and the uplink RF module 230b. To send.

The antenna power supply circuit 250 provides the A band downlink RF signal, the B band downlink RF signal, the C band downlink RF signal, and the D band downlink RF signal to the antenna 260. To this end, the antenna power supply circuit 250 has a matrix structure.

That is, the antenna feed circuit 250 is configured in a matrix structure using a hybrid coupler circuit, and includes four downlink RF signals each including four different band signals A, B, C, and D. Each antenna is mixed and supplied to increase antenna utilization and minimize power loss.

That is, unlike the prior art, which has a power loss of 12 dB, in one embodiment of the present invention, a single signal passes through two hybrid couplers by using a hybrid coupler. As a result, not only the antenna utilization rate but also the power utilization rate can be improved.

The antenna 260 radiates an A band downlink RF signal, a B band downlink RF signal, a C band downlink RF signal, and a D band downlink RF signal received from the antenna power supply circuit 250. That is, each antenna 260 emits a downlink RF signal including all of the A band, the B band, the C band, and the D band.

Hereinafter, the uplink processing operation will be described.

The antenna 260 receives an uplink RF signal including an A band, a B band, a C band, and a D band, respectively, and transmits the uplink RF signal to the antenna feeding circuit 250.

The antenna power supply circuit 250 transmits the uplink RF signal received from the antenna 260 to the duplexer 240 for each band. That is, the antenna power supply circuit 250 divides the uplink RF signal of the A band, B band, C band, or D band received by the antenna 260 into service bands for each of the A band duplexer 240a and the B band duplexer 240b. ), The C band duplexer 240c or the D band duplexer 240d.

As described above, the duplexer 240 distinguishes and processes the uplink signal and the downlink signal. Accordingly, the duplexer 240 transmits the uplink RF signal received from the antenna power supply circuit 250 to the uplink RF module 230b.

The uplink RF module 230b band-filters the uplink RF signal received from the duplexer 240 and amplifies or attenuates it to an appropriate level.

The uplink signal combiner 220b combines the A band uplink RF signal, the B band uplink RF signal, the C band uplink RF signal, and the D band uplink RF signal received from the uplink RF module 230b to the A band. A single uplink RF signal including a B band, a C band, and a D band is generated.

The optical module 210 receives an uplink RF signal including the A band, the B band, the C band, and the D band generated by the uplink signal combiner 220b, and converts the received uplink RF signal into an optical signal. Thus, the uplink optical signal converted through the optical line is transmitted to a host unit (not shown).

10 is a block diagram illustrating a configuration of an optical module according to an embodiment of the present invention.

The optical module 140 according to an embodiment of the present invention includes a laser diode (LD) 141, an optical signal splitter 142, a photodiode (PD) 143, and an RF signal combiner 144.

The laser diode (LD) 141 receives a downlink RF signal including all of the A, B, C, and D bands, modulates the received downlink RF signal, and converts the received downlink RF signal into an optical signal.

The optical signal splitter 142 separates the downlink optical signal received from the laser diode (LD) 141 into four downlink optical signals, and transmits the separated downlink signals to the four optical modules 210, respectively. .

The photodiode (PD) 143 receives an uplink optical signal including all of the A, B, C, and D bands from the optical module 210, and demodulates the received uplink optical signal. Convert to an uplink RF signal.

The RF signal combiner 144 combines and outputs four uplink RF signals received from the photodiode (PD) 143 into one uplink RF signal.

The optical module 210 according to an embodiment of the present invention includes a photodiode (PD) 211 and a laser diode (LD) 212.

The photodiode (PD) 211 receives the downlink optical signal from the optical module 140, demodulates the received downlink signal, and converts the received downlink signal into a downlink RF signal.

The laser diode (LD) 212 receives an uplink RF signal and modulates the received uplink RF signal into an uplink optical signal. The laser diode (LD) 212 transmits the uplink optical signal converted through the optical line to the host unit 140.

11 is a block diagram showing the configuration of an optical module according to another embodiment of the present invention.

The optical module 340 and the optical module 410 according to another embodiment of the present invention further include wavelength division multiplexers (WDMs) 345 and 413.

The wavelength division multiplexer (WDM) 345 wavelength-divides the downlink optical signal received from the optical signal splitter 342 and transmits the wavelength-divided downlink optical signal to the optical module 410 through the optical line.

In addition, the wavelength division multiplexer (WDM) 345 receives an uplink optical signal from the optical module 410, and wavelength-divides the received uplink optical signal to the photodiode 343.

The wavelength division multiplexer (WDM) 413 receives the downlink optical signal from the optical module 340, and wavelength-divides the received downlink optical signal to the photodiode (PD) 411.

In addition, the wavelength division multiplexer (WDM) 413 receives the uplink optical signal from the laser diode (LD) 412 to perform wavelength division, and transmits the wavelength-divided uplink optical signal through the optical line to the optical module 340. To send).

As such, the optical module according to another embodiment of the present invention reduces the number of optical lines required by using the wavelength division multiplexer.

The foregoing description of the present invention is intended for illustration, and it will be understood by those skilled in the art that the present invention may be easily modified in other specific forms without changing the technical spirit or essential features of the present invention. will be. It is therefore to be understood that the above-described embodiments are illustrative in all aspects and not restrictive. For example, each component described as a single type may be implemented in a distributed manner, and similarly, components described as distributed may be implemented in a combined form.

The scope of the present invention is shown by the following claims rather than the above description, and all changes or modifications derived from the meaning and scope of the claims and their equivalents should be construed as being included in the scope of the present invention. do.

1 is a block diagram showing the configuration of an optical relay device according to the prior art;

2 is a block diagram showing a configuration of an optical relay apparatus using an antenna distributed installation according to the prior art;

3 is a block diagram showing the configuration of an optical repeater for distributing and installing antennas using a combiner and a divider according to the prior art;

4 is a block diagram showing the configuration of an optical module device included in a master unit and a slave unit according to the prior art;

5 is a block diagram showing the configuration of an optical module device using a wavelength division multiplexer according to the prior art;

6 is a block diagram showing the configuration of a multi-band optical relay system according to an embodiment of the present invention;

7 is a block diagram showing a configuration of a host unit according to an embodiment of the present invention;

8 is a block diagram showing the configuration of a band module according to an embodiment of the present invention;

9 is a block diagram showing the configuration of a remote unit according to an embodiment of the present invention;

10 is a block diagram showing a configuration of an optical module according to an embodiment of the present invention;

11 is a block diagram showing the configuration of an optical module according to another embodiment of the present invention.

Claims (8)

delete delete In the host unit of the multi-band optical relay system, A band module including an attenuator and an amplifier for controlling levels of a plurality of downlink RF signals having respective service bands, A combiner for combining the plurality of level controlled downlink RF signals to generate a downlink RF signal having a plurality of service bands; An optical module for converting the downlink RF signal having the plurality of service bands into a downlink optical signal having a plurality of service bands; A distributor connected between the band module and the optical module, The downlink optical signal having the plurality of service bands is transmitted to at least one remote unit of the multi-band optical relay system, The optical module converts an uplink optical signal having a plurality of service bands from the at least one remote unit into an uplink RF signal having a plurality of service bands, The splitter splits the RF signal having the plurality of service bands into a plurality of uplink RF signals having each service band, And the band module performs at least one of attenuation, amplification, and band filtering on the uplink RF signal having the respective service band. The method of claim 3, wherein The optical module A laser diode for converting a downlink RF signal having the plurality of service bands into a downlink optical signal having the plurality of service bands; A photo diode converting an uplink optical signal having the plurality of service bands into an uplink RF signal having the plurality of service bands. The host unit comprising a. The method of claim 4, wherein The optical module A wavelength division multiplexer for wavelength division of the downlink optical signal having the plurality of service bands and transmitting the wavelength to the remote unit, and a wavelength division multiplexer for wavelength division of the uplink optical signal having the plurality of service bands and transmitting the wavelength to the photodiode. host unit further comprising multiplexer (WDM). In the remote unit of a multi-band optical relay system, An optical module for converting a downlink optical signal having a plurality of service bands received from a host unit into a downlink RF signal having a plurality of service bands, A splitter for separating the downlink RF signals having the plurality of service bands and converting the downlink RF signals into a plurality of downlink RF signals having respective service bands; A downlink radio frequency (RF) module for performing at least one signal processing among attenuation, amplification, and band filtering on the downlink RF signals having the respective service bands; An antenna feeding circuit for mixing and supplying the signal-processed downlink RF signal to an antenna through a feeding circuit including a hybrid coupler having a matrix structure; An uplink RF module performing signal processing of at least one of attenuation, amplification, and band filtering on a plurality of uplink RF signals having respective service bands; and A combiner for combining the signal-processed uplink RF signal into a uplink RF signal having a plurality of service bands, The downlink optical signal received from the host unit, the level control is performed in the state of the RF signal before being converted into the optical signal, And the optical module converts an uplink RF signal having the plurality of service bands into an uplink optical signal having the plurality of service bands and transmits the uplink RF signal to the host unit. The method of claim 6, The optical module A photo diode converting a downlink optical signal having the plurality of service bands into a downlink RF signal having the plurality of service bands; A laser diode converting an uplink RF signal having the plurality of service bands into an uplink optical signal having the plurality of service bands. Remote unit comprising a. The method of claim 7, wherein The optical module A wavelength division multiplexer for wavelength division of the downlink optical signals having the plurality of service bands and transmitting them to the photodiode, and wavelength division of the uplink optical signals having the plurality of service bands and transmitting them to the host unit; a remote unit further comprising multiplexer, WDM).

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