KR20060068179A - Integrated optical transmission system for communication and broadcasting signals - Google Patents

Abstract

The present invention relates to a system for integrating communication and broadcast signals and optical transmission. More particularly, the present invention relates to a system for transmitting and receiving communications and broadcasting signals between a central base station and a subscriber end in an optical subscriber network including a central base station, a relay node, and a subscriber end. It relates to an optical transmission device for.

The present invention, in the subscriber network consisting of the central base station, relay node and subscriber end, the combiner for integrating some or all of the output of the switch and the distributor of the relay node to transmit signals to the subscriber end by a single optical cable Field 3; Gateways (5) for demodulating and separating the original signal from the subscriber end from the optical signal transmitted from the relay node, or modulates and outputs the optical signal to be transmitted to the central base station.

Using the present invention as described above, it is possible to provide an optical transmission for integrating and transmitting and receiving communication and broadcast signals between the central base station and the subscriber end in the optical subscriber network consisting of the central base station, relay node and the subscriber end.

Optical subscriber network, relay node, combiner, gateway

Description

Integrated Optical Transmission System for Communication and Broadcasting Signals

1 is an optical subscriber communication network according to the prior art.

Figure 2 illustrates integrating all of the relay and switch outputs of a relay node in accordance with the present invention.

3 illustrates incorporating a portion of the output of a distributor of a relay node in accordance with the present invention.

Figure 4 illustrates the use of an optical coupler combined with a distributor and an integrator in Figure 3 of the present invention.

Figure 5 illustrates incorporating some input to a relay node's distributor in accordance with the present invention.

Figure 6 illustrates incorporating all of the inputs of the relay node into the distributor in accordance with the present invention.

7 is a block diagram of an all-opto-photoelectric converter used in the present invention.

8 is a block diagram of a tube signal separator / combiner used in the present invention.

9 is a block diagram of an optical receiver separating the output from the distributor of the present invention at the subscriber end.

10 is a block diagram of an optical transceiver for separating input / output of a switch and a divider at the subscriber end of the present invention.

The present invention relates to a system for integrating communication and broadcast signals and optical transmission. More particularly, the present invention relates to a system for transmitting and receiving communications and broadcasting signals between a central base station and a subscriber end in an optical subscriber network including a central base station, a relay node, and a subscriber end. It relates to an optical transmission device for.

Conventionally, each building or apartment has a telephone cable for a telecommunication network, a coaxial cable for CATV or satellite broadcasting, and a broadband cable for a high-speed Internet network. Select to connect the device.

However, as various communication and broadcasting services are recently implemented, as shown in FIG. 1, a relay node (installed for each building or apartment building) in the central base stations (1-1 ... 1-N) providing each service. The coordinator or optical cable is connected to the switch or distributor of the network, and one line is connected to each subscriber station (4-1 ... 4-M) from the relay node switch or distributor to each subscriber station (4-1 ... 4-M). Various service equipment such as internet, CATV or satellite broadcasting are connected to each service terminal.

However, such a prior art uses each subscriber end (< / RTI > to transmit a signal of each central base station 1-1 ... 1-N from a relay node to each subscriber end 4-1 ... 4-M. Since 4-1 ... 4-M must be connected with as many cables as the central base station (1-1 ... 1-N), the relay node and the multiple subscribers (4-1 ... 4-N) A large number of cables were used between), which resulted in a price increase due to the use of a significant amount of cables, excessive cabling costs, and excessive maintenance and repair costs due to complex wiring.

On the other hand, in recent years, a variety of broadcasting (CATV, MATV, satellite broadcasting) and communication (high-speed Internet, wired telephone) services are provided, and due to the increase of these services, the integrated broadband rather than the conventional transmission method as described above The need to build a network is emerging.

In addition, in recent years, various broadband services requiring wide bandwidth have emerged, and there have been many problems in accommodating these services with existing copper wires. Therefore, the necessity of implementing the optical subscriber network using the optical cable is increasing to provide more bandwidth to the subscriber end.

SUMMARY OF THE INVENTION The present invention provides an optical transmission system for integrating and transmitting communications and broadcast signals between a central base station and a subscriber end in a subscriber communication network including a central base station, a relay node, and a subscriber end, in view of the problems of the prior art.

More specifically, by connecting the line from the relay node to each subscriber end using the optical cable, the optical transmission system can provide stable signal transmission and reduce the cable cost, cabling cost, and maintenance cost.

Now, a method of transmitting a signal from the relay node to each subscriber end using an optical cable will be described with reference to FIG. 2.

Each signal from each central base station (1-1 ... 1-N) enters the electrical switch or distributor of the relay node 2 via a cable, and the electrical signals output from each switch or distributor are integrated. The modulated signal 3 is modulated to carry a different signal for each frequency band, and then pre / optically converted and transmitted to each subscriber station 4-1 ... 4-M by an optical cable.

Each subscriber end optically / electrically converts an optical signal transmitted through one optical cable, separates and transmits various signals included in the converted electrical signal to each device, and transmits signals generated by each device to all / optical conversions. There is a gateway (5-1 .... 5-M) for transmitting to the central base station via the relay node. In this device, each signal is demodulated, and each signal is separated and sent to a terminal suitable for each device. Each device is connected to the corresponding terminal of this terminal box to receive service, and the information that the user wants to send can be sent to the central base station through each device.

In this case, when the signals transmitted from the central base station 1 are electrical signals, the switch of the relay node 2 receives an electrical signal, undergoes electrical signal processing, and then outputs a pre / light converted signal. However, when the signals transmitted from the central base station 1 are optical signals, the switch of the relay node 2 first performs optical / pre conversion, and then outputs pre / photo conversion signals after the signal processing. In the case of the splitter of the relay node 2, if the signal transmitted from the central base station 1 is an electrical signal, the pre / optically converted signal is optically distributed and output, and the signal transmitted from the central base station 1 If it is an optical signal, it is distributed without output / optical conversion.

In the subscriber station gateway (5-1 ... 5-M), if the device used at the subscriber end operates by receiving an electrical signal, optical / electric conversion is required, but the device at the subscriber end is optical. If the device requires an input and the corresponding terminal of the terminal box is an optical terminal, the gateway 5-1... 5-M should have a built-in module for separating optical signals and connecting them for each terminal.

With the above configuration, since the connection from the relay node 2 to each subscriber end 4 is made by one optical cable, it is possible to reduce the cable cost, the cabling cost, and the maintenance / repair cost. In addition, since the transmission by the optical cable can provide a wide bandwidth as compared to the case using the conventional copper wire, it is possible to transmit broadband communications and broadcast signals.

Meanwhile, in FIG. 2, all the outputs of the switch and the splitter of the relay node 2 are integrated in the integrator 3 and configured to be led to each subscriber end by one optical cable. However, as shown in FIG. Integrated in the integrator (3) and transmitted to each subscriber end (4-1 ... 4-M) in one optical cable, the output of the switch or the splitter excluded from the integrated splitters is introduced through a separate optical fiber. It is also possible to configure the configuration.

In addition, in general, the optical coupler can simultaneously perform the integration and distribution of the optical signal in accordance with the principle of operation. Thus, in the embodiment of FIG. 3, the number of devices used can be reduced by replacing the distributor and the integrator 3 with one optical coupler. This embodiment is shown in FIG.

2 and 3, the broadcast signal lines in the central base station 1 must all be introduced to the splitter of the relay node 2, so that the splitter capable of accommodating these signals has a number of input terminals. There is a large enough and expensive distributor to distribute this many inputs.

In the present invention, in order to make up for the shortcomings of the present invention according to FIGS. 2 and 3, another embodiment of the present invention proposes a method of integrating some or all of broadcast signals at each central base station and inputting them to a distributor node. This application example will be described with reference to FIGS. 5 and 6.

In FIG. 5, the signals of some broadcasting central base stations 1-2 and 1-3 having different wavelengths are integrated using the integrator 6 and transmitted to the relay node 2. In FIG. It shows the transmission of the signals of the other whole broadcasting base station (1-2 ... 1-N) by using the integrator 6 to the relay node (2).

The integrated signal as described above is transmitted to each subscriber end via a splitter of the relay node 2 as one optical cable as shown in FIGS. 2 and 3, and integrated at each subscriber end (4-1 to 4-M). The signals are separated into a plurality of signals through the gateways 5-1 ... 5-M, which are demodulated again, and output to the terminals of the terminal boxes of the respective subscribers 4-1 ... 4-M.

The photoelectric converter and the all-optical converter will now be described.

For the present invention described in FIGS. 2-6 of the present invention, when each central base station, each switch and distributor, and the subscriber end are all electrical devices, the connection between these devices must be made of optical cables. The same all-optical converter or photoelectric transducer is required.

For example, an all-optical converter should be used at the output part of the central base station 1 for each broadcast, a photoelectric converter should be used at each subscriber end, and a switch of a relay node (because it is a line such as the Internet, etc.). The optoelectronic converter and the optoelectronic converter shall be used in pairs at both ends, and the optoelectronic converter and the all-optical converter may be used at both ends of the relay node distributor (only transmission from the central base station to the subscriber end).

However, when the photoelectric converter and the all-optical converter as shown in FIG. 7 are used for a switch that transmits a bidirectional signal, two strands of optical cables must be used at both ends, thereby increasing the number of wirings, thereby increasing installation and maintenance costs. .

In order to compensate for this disadvantage, an optical transmitter as shown in FIG. 8 may be used. The optical transceiver performs a function of converting an electrical signal into an optical signal and a function of converting an optical signal into an electrical signal at the same time, and further includes an optical signal separator / combiner for input and output of the optical signal. The combiner not only outputs the optical signal through one terminal but also receives the optical signal at the same time. An example of such an optical signal splitter / combiner is the DWTC series (model name DWTC11AP0001211) of Oplink (www.oplink.com).

Now, the integration of each signal in the integrators 3 and 6 and the separation of each signal in the gateway 5 will be described in detail.

In FIG. 3, in order to reduce the number of optical cables between the relay node 2 and the subscriber end 4, the outputs of two or more distributors are integrated and transmitted to the subscriber end 4, in order to integrate the signals of each channel by frequency band. The optical signal splitter (e.g., optical signal separator including an optical band filter having a center frequency in the frequency bands f1 and f2) as shown in FIG. Using Oplink's MWDM sries model name MWDM13150001P211 A method of separating signals using a band pass filter can be used.

Next, in FIG. 2, in order to reduce the number of optical cables between the relay node 2 and the subscriber end 4, two or more distributors and one switch are integrated and transmitted to the subscriber end 4. In order to input and output signals, the output of the switch and the output of the divider must be in different frequency bands f1 and f2, and the switch input must use the same band f1 as the switch output or the output of the switch or the output of the divider. Must use a different band f3. 10 illustrates an optical transmitter and receiver at the subscriber end 4. As shown in FIG.

The optical signals at the central base stations shown in Figs. 5 and 6 are integrated in the relay node and input to the splitter. In this case, for example, the subscriber 4 is used with the optical receiver as shown in Fig. 9.

Although the preferred embodiments of the present invention have been described above, the present invention is not limited to the above embodiments, but various improvements, modifications, substitutions or additions can be made without departing from the gist of the present invention. Those skilled in the art will readily understand.

Using the present invention as described above, it is possible to provide an optical transmission for integrating and transmitting and receiving communication and broadcast signals between the central base station and the subscriber end in the subscriber network consisting of the central base station, relay node and subscriber end.

Claims (7)

In a subscriber optical communication network composed of central base stations, relay nodes and subscribers, Combiners (3) for modulating and integrating some or all of the outputs of the switches and distributors of the relay node to transmit signals to each subscriber end with a single optical cable; And a plurality of gateways (5) installed at each subscriber end to demodulate and separate the original signal from the optical signal received by the combiner (3). The method of claim 1, Wherein said modulation and integration modulate each signal by frequency bands, and wherein said demodulation and separation separates signals in each frequency band. The method of claim 1, And an integrator (6) at the input of the switches and distributors of the relay node for modulating and combining some or all of the outputs at each central base station. The method of claim 1, And a photoelectric converter and an all-optical converter, respectively, at both ends of the splitters of the relay node. The method of claim 1, Subscriber optical communication network, characterized in that the optical signal separator / combiner is used for the switch of the relay node. The method of claim 2, And the optical signal separator for separating the original signal in different frequency bands (f1, f2). The method of claim 1, In the gateway, The output signals of the switches and dividers received at different frequencies are separated in mutually different frequency bands f1 and f2, and the input signal to the switch is in the frequency band f1 at the time of separation of the switch output signal or the switch and output signals. And an optical signal splitter / combiner for separating the frequency bands f1 and f2 into a different frequency band f3 at the time of separation.

Images