KR20020004674A - 5 wave optic repeater system - Google Patents

Abstract

PURPOSE: A 5-wavelength optic repeater is provided to obtain a line saving effect and to improve diversity performance by using two remote repeaters, connected to a base station, in a drop method. CONSTITUTION: Each remote optic repeater(Remote 1,2) receives RF signals(RF0,RF1) from a portable phone doubly, converts them into optical signals(lambda 3 and 5, lambda 2 and 4), and transmits the converted signals to a base station(Master). Also each remote optic repeater(Remote 1,2) receives a signal from the base station(Master) at a wavelength of lambda 1 and transmits it to the portable phone. The base station(Master) receives the dual signals from each remote optic repeater(Remote 1/2), selects the optimum signal between them, and transfers the selected one to the portable phone. The base station(Master) also transmits a signal to each remote optic repeater(Remote 1,2) using lambda 1. A C-WDM(Compound-Wavelength Division Multiplexer) or a WIC(Wavelength Independent Coupler) is used to connect between the base station and the remote optic repeaters(Remote 1,2).

Description

5-wavelength optical repeater {5 WAVE OPTIC REPEATER SYSTEM}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical repeater, and more particularly, to a five-wavelength optical repeater of an optical path-saving type having improved diversity characteristics.

In the conventional wireless mobile communication, the optical repeater system uses a method of transmitting signals transmitted and received from a base station and a repeater to one optical fiber by using 1.3 μm and 1.5 μm (one base station and one repeater).

However, after installing the optical repeater, the maintenance cost was increased after installing the equipment because the optical cable must be used through the network of another operator. To solve this problem, a four-wavelength optical repeater using one core optical cable has been developed (one base station and three repeaters).

On the other hand, another problem of the optical repeater is that a method for carrying two wireless signals on one optical signal for diversity is used, but the call quality is poor, a repeater is required to compensate for this.

The diversity implementation of the conventional two-wavelength and four-wavelength optical repeater system converts two RF radio signals into one optical signal. In this case, two RF signals must be carried on one wavelength. On the contrary, in the process of restoring the optical signal to the original signal, the noise of the signal increases and the call quality deteriorates.

In addition, diversity implementation of an optical repeater system using three wavelengths adopts a method of dividing a received wireless signal into two wavelengths to improve call quality.

However, in the case of the four-wavelength optical repeater system, the system is made for the optical path reduction effect, and the call quality is not good because the diversity is solved wirelessly. The call quality is good by transmitting the signal, but it does not have the effect of saving the optical fiber.

Therefore, the present invention is to solve the above problems, it is to provide an optical repeater having a function of transmitting the RF radio signal to the base station to each of the two optical wavelengths to the repeater of Remote 1 and 2, and also has a line saving effect Purpose.

1 is a block diagram of a five-wavelength optical repeater according to an embodiment of the present invention.

The present invention has a line-saving effect using a drop method when constructing a 5-wavelength optical repeater system using two repeaters connected to a base station, and maximizes reception sensitivity by improving diversity performance.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

1 is a block diagram of a five wavelength optical repeater system according to the present invention.

In the drawings, Remote1 and 2 respectively communicate with a terminal, that is, a mobile phone, as a remote repeater. That is, for diversity, the signal from the mobile phone is received in duplicate (λ3 and λ5, λ2 and λ4) and transmitted to the base station. That is, each remote repeater converts the RF radio signals of Rx0 and Rx1 into optical signals of λ3 and λ5, λ2 and λ4 and transmits them to the base station. In addition, it receives a signal from the base station at a wavelength of λ 1 and transmits it to a mobile phone.

In the figure, the master is a base station, which receives a double signal transmitted from each remote repeater and selects the best signal among them and transfers it to the mobile phone. It also uses λ1 to send a signal to each remote repeater.

A C-WDM (Compound-Wavelength Division Multiplexer) or WIC (Wavelength Independent Coupler) is used to connect both devices between the base station and the remote repeater.

The communication between the base station and the remote repeater will be described using the apparatus of the present invention configured as described above.

First, the wavelengths used are optical signals of one wavelength in the 1310 nm wavelength band and 1510 nm, 1530 nm, 1550 nm, and 1570 nm in the 1500 nm band.

The base station transmits a signal of 1310 nm to each remote repeater, and each remote repeater splits wavelengths at intervals of 40 nm (1500 nm band) into 1310/1510/1550 and 1310/1530/1570 to maximize the isolation between channels. To do that.

On the other hand, the base station is a LD (laser diode) for transmitting 1310nm to each remote repeater and a PD (photo diode) for receiving wavelengths of 1510/1530/1550 / 1570nm, 20nm spacing Spacing Wavelength Division Multiplex (WDM) for distributing them This is used. In some cases, the 1500-band optical reception signal may not be distributed to the WDM, but may be received by only one PD and may be divided into circuits for use.

The remote repeater 1 converts a radio signal from a PD and a mobile phone (terminal) receiving 1310 nm into 1510 nm and 1550 nm light and transmits it to the base station.

The remote repeater 2 converts the radio signal from the PD and the terminal receiving 1310 nm into light of 1530 nm and 1570 nm and transmits it to the base station.

As described above, according to the present invention, the wavelengths used are 1310, 1510, 1530, 1550, and 1570 nm. The isolation is at least -12dB. It also implements a five-wavelength optical repeater with a bandwidth of ± 6nm.

In other words,

Wavelength used: 1310, 1510, 1530, 1550, 1570nm

Channel isolation: Min -12dB or more

Band width: ± 6nm

Has features and effects

Therefore, by installing two repeaters in its base station, it is possible to reduce the optical path, and by using different wavelengths in the repeater, it is possible to add the diversity function of the separated path to improve the noise improvement effect and the call quality.

Claims (1)

A base station for processing an optical signal of five wavelengths, A remote repeater for processing three wavelengths of optical signals, Consists of C-WDM or WIC connecting the base station and the remote repeater, All signals required for the base station to transmit to each remote repeater are transmitted and received using signals of the same wavelength, Each remote repeater receives a signal from a terminal, corresponds to a signal having two different wavelengths, then combines them, and transmits them to a base station. The base station selects an optimal signal from the signals for diversity and transmits it to the terminal. Repeater for five wavelengths, characterized in that.