KR20050032244A - The method of gain setting of optical repeater using pilot signal - Google Patents

Abstract

A gain setting method of an optical repeater by using pilot signals is provided to confirm a current gain with controlling a remote pilot signal by a repeater centralized managing center, and to control a backward gain by a centralized monitoring system, thereby setting the backward gain by the optical repeater according to a command of the centralized monitoring system. The first and the second couplers combine random pilot signals generated from the remote unit. A remote optical receiving unit converts the random pilot signals into optical signals, and transmits the converted optical signals to a donor unit through an optical cable(S100). A donor optical receiving unit converts the optical signals transmitted from the remote optical receiving unit into RF signals(S110). The first and the second separators of the donor unit separate pilot signals from the converted RF signals(S120). A local generator of the donor unit detects an intensity of the separated pilot signals(S130).

Description

The method of gain setting of optical repeater using pilot signal}

The present invention relates to a gain setting method of a mobile communication optical repeater. More particularly, the present invention relates to a method for setting a gain of an optical repeater using a pilot signal that can provide a low-cost optical repeater and provide convenience of maintenance of the optical repeater.

Optical repeaters, which are widely used in cellular and PCS, are now being used in terms of coverage expansion of base stations to extend mobile phone services to shadowed areas where signals from base stations are difficult to reach.

Such an optical repeater is connected between the base station and the optical repeater by an optical cable, converts the RF signal of the base station into an optical signal and transmits the optical signal to the optical repeater, and the optical repeater restores and amplifies the RF signal back to provide a service to the user.

In particular, setting the reverse gain of the optical repeater to an appropriate value and inputting an appropriate signal level to the base station is an important factor in facility operation. Such commercially available optical repeater systems suffer from such setup and maintenance. Some of the reasons are as follows.

First, in the current commercial repeater system, the reverse gain can be set only when at least two people in the home country and the home country are dispatched to the field.

Second, in order to set the gain, expensive and inexpensive measuring equipment, that is, a signal generator (Signal Generator) capable of generating a signal and a spectrum analyzer (Spectrum Analyzer) capable of measuring a signal, are required.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and an object of the present invention is to provide a low cost optical repeater and the convenience of optical repeater maintenance, thereby providing a high quality service of a mobile communication optical repeater. It is to provide a setting method.

As the technical idea for achieving the above object of the present invention

In the gain setting method of the optical repeater having a donor portion and a remote portion connected via an optical line,

Combining any pilot signals generated from the remote unit and converting them into optical signals;

Transmitting the converted optical signal to a donor unit through an optical line;

Converting an optical signal transmitted from the remote unit into an RF signal at a donor unit;

Separating a pilot signal from the converted RF signal;

It provides a gain setting method of the optical repeater comprising the step of detecting the intensity of the separated pilot signal.

Hereinafter, with reference to the accompanying drawings, the configuration and operation of the embodiment of the present invention will be described in detail.

1 is a schematic diagram of an optical relay system according to the present invention. 2 is a detailed block diagram of an optical relay system for setting a reverse gain according to the present invention.

As shown in FIG. 1, the optical relay system receives a signal of the base station 10, converts the signal into an optical signal, and transmits the same to a remote, and an optical signal of the donor 20. Received through the optical cable 30 is divided into a remote unit 40 to convert and amplify again to the RF signal.

Here, the donor part 20 includes a donor light receiver 21 serving as a light / electric conversion as shown in FIG. 2; First and second couplers 22a and 22b; Amplifier 23; First and second variable attenuators 24a and 24b; First and second dividers 25a and 25b; First and second attenuators 26a and 26b for reverse gain control; Local generator 27; And a donor control unit 28.

The remote unit 40 includes first, second and third variable attenuators 41a, 41b and 41c; First and second remote signal generators 42a and 42b for generating pilot signals; First and second couplers 43a and 43b; First and second dividers 44a and 44b; And a remote light receiving unit 45.

Looking at the above operation process, after combining the arbitrary pilot signal generated in the remote unit 40 of the optical repeater to convert the optical signal, and transmits to the donor unit 20 through the optical cable 30.

The donor unit 20 converts an optical signal into an RF signal and then separates the pilot signal, and detects the strength of the separated pilot signal.

At this time, the difference between the pilot signal transmitted from the remote unit 40 and the pilot signal received from the donor unit 20 becomes the reverse gain, so that the desired level can be obtained. The first and second attenuators 26a and 26b are automatically adjusted.

Therefore, in the optical repeater according to the present invention, it is possible to set a desired reverse gain between the remote unit 40 and the donor unit 20.

3 is a flowchart illustrating a reverse gain setting process in the optical repeater according to the present invention.

First, any pilot signal generated by the first and second remote signal generators 42a and 42b of the remote unit 40 is transferred to the first and second combiners 43a and 43b and the first and second separators 44a and 44b. Combine and separate.

Then, after converting the optical signal in the remote optical receiver 45, the converted optical signal is transmitted to the donor unit 20 through the optical cable 30 (S100).

Thereafter, the optical signal transmitted from the remote unit 40 is converted into an RF signal by the donor light receiving unit 45 of the donor unit 20 (S110), and then the pilot signal is converted into a first signal from the converted RF signal. It is separated from the two separators (25a, 25b) (S120).

Thereafter, after detecting the strength of the separated pilot signal in the local generator 27, the first and second attenuators 26a and 26b are automatically controlled through the donor controller 28 (S130).

At this time, since the difference between the pilot signal transmitted from the remote unit 40 and the pilot signal received from the donor unit 20 becomes a reverse gain, the first and second attenuators 26a and 26b may be at a specific level. ) Is adjusted automatically.

As a result, in the optical repeater of the present invention, a desired call quality using the optical repeater is maintained by setting a desired reverse gain between the remote unit 40 and the donor unit 20.

As described above, according to the present invention, the operator can check the current gain through the control of the remote pilot signal in the repeater centralized management center, not the field, the centralized monitoring system for the desired reverse gain when the reverse gain needs to be reset When controlled at, the command is executed at the optical repeater to allow the operator to set the desired reverse gain.

This provides the accuracy of the reverse gain setting of the optical repeater and the convenience of maintenance, thereby ensuring a good quality using the optical repeater.

1 is a schematic diagram of an optical relay system according to the present invention.

2 is a detailed block diagram of an optical relay system for setting a reverse gain according to the present invention.

3 is a flowchart illustrating a reverse gain setting process in the optical repeater according to the present invention.

Claims (3)

In the gain setting method of the optical repeater having a donor portion and a remote portion connected via an optical line, Combining any pilot signals generated from the remote unit and converting them into optical signals; Transmitting the converted optical signal to a donor unit through an optical line; Converting an optical signal transmitted from the remote unit into an RF signal at a donor unit; Separating a pilot signal from the converted RF signal; And detecting the intensity of the separated pilot signal. The method according to claim 1, And setting the reverse gain of the optical repeater using the difference between the pilot signal of the remote unit and the pilot signal received from the donor unit. The method according to claim 2, The gain setting method of the optical repeater, characterized in that the reverse gain of the optical repeater is automatically adjusted by an attenuator (ATT) to be a certain level.