KR20100107906A - Analog optical repeater system of double wavelength division multiplexing type - Google Patents

Abstract

PURPOSE: A double wavelength division multiplexing type analog optical repeater system is provided to match a single master unit with slave units, thereby drastically reducing the installation and maintenance costs of an optical repeater. CONSTITUTION: A forward signal from a mobile communication base station and a reverse signal from a wireless subscriber side mobile communication terminal are repeated. A single master unit is connected to at least one slave unit through an optical cable. The single master unit optically distributes and transmits the forward signal according to the slave unit(s). The single master unit combines reverse signals from each slave unit and transmits them to the mobile communication base station.

Description

Analog Optical Repeater System of Double Wavelength Division Multiplexing Type

The present invention relates to a two-wavelength multiplexing analog optical repeater system that enables optical relaying of an analog signal of two-wavelength multiplexing by allowing a single master unit to be matched with a plurality of slave units.

In general, in a mobile communication system, a wireless repeater system is installed between a mobile communication base station section and a wireless subscriber in order to solve a shadow area generated in a wireless communication interface section of a mobile communication network and to achieve high quality voice communication or wireless data communication. Is operating.

The wireless repeater system amplifies a signal received from a mobile communication base station and transmits it to a wireless subscriber side mobile communication terminal in a shaded area, and a wireless relay function amplifies a signal received from a mobile communication terminal in a shaded area and transmits a signal to a mobile communication base station. Recently, in order to minimize the signal loss of the transmission and reception signal, an optical repeater system for transmitting a signal through an optical path has been developed and applied.

1 is a view showing the configuration of a conventional analog optical repeater system.

As shown in FIG. 1, the conventional analog optical repeater system includes a mobile communication base station 10, a forward signal FWD, a reverse main signal RVS_Main, and reverse diversity with respect to the mobile communication base station 10. A plurality of master units (MU1 to MUn) for transmitting and receiving signals (RVS_Div) and respective master units (MU1 to MUn) are respectively connected to each other via an optical fiber to transmit and receive signals to and from the wireless subscriber-side mobile communication terminal. It includes a plurality of slave units (SU1 to SUn) to perform.

In the conventional analog optical repeater system, a plurality of master units MU1 to MUn are connected in a one-to-one correspondence to a plurality of slave units SU1 to SUn via optical paths to relay signals of a two wavelength division multiplexing method. I can do it.

However, since such a conventional analog optical repeater system has to be provided with a plurality of master units corresponding to one to one each for a plurality of slave units, the installation and maintenance costs of the optical repeater are inevitably increased, and wireless In order to expand the communication coverage, it is necessary to install both the master unit and the slave unit, which increases the installation cost and maintenance cost.

Accordingly, the present invention has been made to solve the above-described problems, and an object thereof is to divide and control a plurality of slave units in a single master unit in a two wavelength division multiplex optical repeater. It is to provide a multi-system analog optical repeater system.

In order to achieve the above object, according to the present invention, in the analog wavelength repeater system of the two wavelength division multiplexing method for relaying the forward signal from the mobile communication base station and the reverse signal from the wireless subscriber-side mobile communication terminal through the optical path, A single master connected to at least one slave unit through an optical path, optically distributes the forward signal according to the number of slave units, and combines the reverse signals from each slave unit to transmit the signal to the mobile communication base station. A unit, and a single master unit and a common optical connection, respectively, to transmit the optically distributed forward signal from the single master unit to a wireless subscriber side mobile communication terminal, and to transmit a reverse signal from the mobile communication terminal. Each single master unit A transmission unit for at least one slave to provide a second wavelength division multiplexing of the analog optical repeater system, characterized in that configured.

As described above, according to the present invention, a plurality of slave units can be controlled by matching a plurality of slave units with a single master unit in a two-wavelength split multi-mode analog repeater system to control transmission and reception of forward signals and reverse signals. Since a single master unit can be matched, it is possible to drastically reduce the installation and maintenance cost of the optical repeater, and it is compatible with the already installed slave unit, and only adds the slave unit. As a result, it is possible to extend the wireless coverage to reduce costs.

Hereinafter, the present invention configured as described above will be described in detail with reference to the accompanying drawings.

That is, FIG. 2 is a diagram illustrating a configuration of an analog optical repeater system of two wavelength division multiplexing according to the present invention.

As shown in FIG. 2, a two-wavelength split multiplex optical repeater system according to the present invention includes a base station transceiver system (BTS) 10 and a protocol conversion unit (PCU). 20, a single master unit 30, and a plurality of slave units SU1 to SUn.

The single master unit 30 transmits / receives signals by transmitting and receiving the mobile communication base station 10 and the forward signal FWD, the reverse main signal RVS_Main and the reverse diversity signal RVS_Div. Matching is performed via the slave units SU1 to SUn and the optical path, respectively.

The plurality of slave units SU1 to SUn are commonly connected to the single master unit 30 through an optical path to receive forward signals from the single master unit 30 in the form of optical signals through the optical path. After conversion, the antenna is transmitted to the wireless subscriber-side mobile communication terminal through each antenna. The reverse signal from the wireless subscriber-side mobile communication terminal is optically converted and transmitted to the single master unit 30 through the optical path.

As shown in FIG. 3, the single master unit 30 includes an RF unit 40, a main control unit 50, a laser diode (LD) 60, and an optical splitter 70. And a plurality of wavelength division multiplexers (WDMs) M1 to Mn, a plurality of photo diodes (PD) to PD1, and a signal combiner 80.

The RF unit 40 includes an RF amplifier for amplifying a signal level of an RF signal, a filter for performing filtering to remove signals other than a corresponding band from the amplified signal, and an external parallel adjustment of the signal level of the RF signal. Attenuator to reduce step by step, Signal detector to monitor the signal strength of forward RF signal, Signal mixer to output frequency of 1775MHz by intermodulating 70MHz and 1705MHz input frequency of reverse diversity signal. And a signal amplifier 45 for compensating for signal loss of the optical splitter 70.

The laser diode 60 converts the forward signal input from the RF unit 40 into an optical signal, and the optical splitter 70 converts the all-optical converted optical signal into the plurality of slave units SU1 to SUn. And distributes the number corresponding to the < RTI ID = 0.0 > Here, the laser diode 60 functions as an all-optical converter.

The laser diode 60 is set to a high input power by the signal compensation by the signal amplifier 45 in the RF unit 40, the input power is 5 ~ 6mW is about 6dB difference compared to the conventional 3mW Will have power value.

In addition, the optical splitter 70 includes a three-way divider to transmit the all-optical forward optical signal to three branches.

The plurality of wavelength division multiplexers M1 to Mn are provided in a number corresponding to the number of the plurality of slave units SU1 to SUn, and are connected to each of the slave units SU1 to SUn through an optical path. An optical signal from 70 is transmitted to each of the slave units SU1 to SUn, and an optical signal from each slave unit SU1 to SUn is received and transmitted to the plurality of photodiodes PD1 to PDn, respectively. .

The plurality of wavelength division multiplexers M1 to Mn are provided in units of three for transmitting three branches of optical signals from the optical splitter 70 formed of the three-way optical splitter.

The plurality of photodiodes PD1 to PDn are provided in a number corresponding to the plurality of wavelength division multiplexers M1 to Mn, and photoelectrically converts reverse optical signals from the respective wavelength division multiplexers M1 to Mn. Output in the form of electrical RF signal. The plurality of photodiodes PD1 to PDn respectively function as photoelectric conversion units.

The signal combiner 80 couples the reverse RF signals from the plurality of photodiodes PD1 to PDn and transmits them in the form of a reverse main signal RVS_Main and a reverse diversity signal RVS_Div.

The signal path of the signal combiner 80 from each of the photodiodes PD1 to PDn uses three units of reverse signal paths to receive three branches of reverse optical signals.

In addition, the signal combiner 80 uses two three-way combiners to receive a reverse signal from three units of a reverse signal path.

Next, Figure 4 is a view showing a light source temperature control structure in a two-wavelength multiplexing analog optical repeater system according to the present invention.

As shown in FIG. 4, each photodiode PDa and a laser diode 60a are disposed on the base structure, and an optical cable 95 is inserted and arranged.

Thermistor 92 is disposed on the base structure as a temperature sensor for sensing the temperature of the system, and a thermoelectric cooler (TEC) 90 is disposed below the base structure for controlling the light source temperature. .

In the main control unit 50 (see FIG. 3), when the temperature inside the corresponding system sensed by the thermistor 92 rises above the set temperature, the constant temperature cooler 90 is operated to set the internal temperature to the set temperature. Control to be maintained.

Next, the operation of the present invention made as described above will be described in detail with reference to FIG.

First, when the forward signal FWD from the mobile communication base station 10 is received, the single master unit 30 amplifies and filters the forward RF signal through the RF unit 40 and applies it to the laser diode 60. The laser diode 60 converts the forward RF signal into full light to output an optical signal to the optical splitter 70.

The optical splitter 70 divides the optical signal into respective light splitting multiplexers M1 to Mn, and outputs the respective optical signals through optical paths. Transfers to the corresponding slave units SU1 to SUn.

Meanwhile, the plurality of wavelength division multiplexers M1 to Mn receive the reverse optical signals from the slave units SU1 to SUn through the optical path, and each of the photodiodes PD1 corresponding to the received optical signals, respectively. To PDn).

The plurality of photodiodes PD1 to PDn photoelectrically convert the optical signals from the respective wavelength division multiplexers M1 to MN and output them in the form of an electrical RF signal. The reverse RF signal photoelectrically converted from the PDn is signal-coupled and transmitted to the RF unit 40 as a reverse main signal RVS_Main and a reverse diversity signal RVS_Div.

The RF unit 40 outputs a frequency of 1775 MHz by intermodulating an input frequency of 70 MHz and a local frequency of 1705 MHz of the reverse diversity signal.

While specific embodiments of the present invention have been described and illustrated above, it will be apparent that the present invention may be embodied in various modifications by those skilled in the art. Such modified embodiments should not be understood individually from the technical spirit or the prospect of the present invention, but should fall within the claims appended to the present invention.

1 is a view showing a configuration for a conventional analog optical repeater system,

2 is a view showing the configuration of an analog optical repeater system of two wavelength division multiplexing method according to the present invention,

3 shows a detailed configuration of a single master unit according to a preferred embodiment of the present invention;

4 is a view showing a light source temperature control structure in an analog optical repeater system of two wavelength division multiplex according to the present invention. One

<Explanation of symbols for main parts of the drawings>

10: mobile communication base station, 20: protocol conversion unit,

30: single master unit, 40: RF unit,

50: main control unit, 60: laser diode,

70: optical splitter, 80: signal combiner,

SU1 to SUn: slave unit, M1 to Mn: wavelength division multiplexer,

PD1-PDn: photodiode.

Claims (5)

In an analog optical repeater system of two wavelength division multiplexing method, which relays a forward signal from a mobile communication base station and a reverse signal from a wireless subscriber station mobile communication terminal through an optical path, A single master connected to at least one slave unit through an optical path, optically distributes the forward signal according to the number of slave units, and combines the reverse signals from each slave unit to transmit them to the mobile communication base station. A unit; Each of which is commonly connected through the single master unit and the optical path, and transmits the optically distributed forward signal from the single master unit to a wireless subscriber side mobile communication terminal, and transmits a reverse signal from the mobile communication terminal to the single mobile terminal, respectively. And at least one slave unit transmitting to the master unit of the 2 wavelength division multiplex analog repeater system. The method of claim 1, The single master unit includes: an RF unit for amplifying and filtering the forward signal and providing the reverse signal by intermodulating the reverse signal with a local frequency; An all-optical conversion unit for converting the forward signal from the RF unit into an all-optical signal and outputting it in the form of an optical signal; An optical splitter configured to optically distribute the all-optical converted forward optical signal according to the number of the at least one slave unit; At least one wavelength division multiplexer, each receiving an optical signal distributed from the optical splitter, transmitting the optical signals to a corresponding slave unit through an optical path, and receiving a reverse optical signal from each slave unit; At least one photoelectric conversion unit for receiving a reverse optical signal from each of the wavelength division multiplexers, respectively, for photoelectric conversion and outputting the reverse optical signal; And a signal combiner for signal-combining the reverse signal output from each photodiode and outputting the reverse signal to the RF unit. The method of claim 2, And said all-optical converter is a laser diode and said photoelectric converter is a photodiode. The method of claim 2, The optical splitter is a three-way divider for transmitting an optical signal of three branches, and the signal combiner is two three-way combiners for receiving three branch reverse signals of three paths. The at least one wavelength division multiplexer is divided into three units for transmitting and receiving optical signals of three branches, two wavelength division multiplex analog optical repeater system. The method of claim 2, A thermistor for sensing a temperature inside the structure in which the system is disposed, a constant temperature cooler operated to adjust the temperature in the structure in which the system is disposed, and a temperature inside the system detected from the thermistor to rise above a set temperature. And a main control unit for controlling the operation of the constant temperature cooler.

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