KR100651507B1 - System for distributing optical line in broadcasting communication convergence system - Google Patents

Abstract

The present invention relates to a system for distributing an optical line in a broadcast communication convergence system, and receives a broadcast signal and a communication signal through an external broadcast service network and a communication service network, converts the received signals into optical signals, and converges them into optical signals. And optically converts the optical line terminal and the optical signal received from the optical line terminal into a broadcast signal and a communication signal, and amplifies the broadcast signal in the case of a broadcast signal. In the case of a communication signal, the optical line splitter performs switching and multiplexing and then transmits the optical signal, and separates the optical signal received from the optical line splitter into a broadcast signal and a communication signal for photoelectric conversion and is transmitted from the user. By processing the upstream information, the broadcast signal and the communication signal selected for each user are time slotted. The optical network unit converts the optical network unit and the time slotted optical signal transmitted from the optical network unit into photoelectric conversion, separates the time slotted signal into individual services, and distributes upstream information from the user. And an indoor gateway for optical transmission to the network unit.

Optical Line Splitter, OLT, ONU, Optical Cable, WiFi

Description

System for distributing optical line in broadcasting communication convergence system {SYSTEM FOR DISTRIBUTING OPTICAL CHANNEL IN A BROADCASTING AND TELECOMMUNICATION SYSTEM}             

1 is a view schematically showing the structure of a general broadcast communication convergence system

2 is a diagram schematically illustrating a structure of a broadcast communication convergence system for distributing optical lines according to an embodiment of the present invention.

3 is a diagram schematically illustrating a structure of an optical line splitter in a broadcast communication convergence system according to an embodiment of the present invention.

The present invention relates to a broadcast communication convergence system, and to provide a system for distributing a limited number of optical lines.

Today, 'network convergence' of broadcasting through communication networks and communication through broadcasting networks is being developed. Examples of broadcasting services through a communication network include broadcasting through the Internet, video on demand (hereinafter referred to as VOD) of existing broadcasting stations, and direct satellite broadcasting using a communication satellite. There are additional communication services such as internet service and telephone service through cable network.

In recent years, new services are often provided with features such as video, text, and voice, as well as providing communication contents. The tremendous advances in digital and network technologies have made it possible to deliver interactive information, such as telecommunications, in broadcast services that were limited to one-way information delivery. In addition, it is possible to provide broadcasting services to an unspecified number through communication, which was considered as a one-to-one communication means. As a result, the convergence of broadcasting technology and communication technology is facing a new era of media. At present, convergence of broadcasting and communication is taking place in almost every sector. The convergence of these two areas is based on the hardware aspect of the high-speed network business, the promotion of the Internet, the broadband network, the definition of High Definition TeleVision (HDTV), cable TV and satellite broadcasting. Software aspect of digitization of contents through.

Previously, the characteristics of broadcasts include unidirectionality and reception by an unspecified majority, and the matching of service and network providers. The characteristics of communication as a countermeasure are bidirectionality, one-to-one transmission, and inconsistency between service and network providers. Could be lifted. However, as advanced digital technology is applied to communication and broadcasting areas, the distinction between broadcasting and communication is becoming meaningless.

As a result, the convergence of communication and broadcasting, which is currently being carried out through the Internet due to the spread of Internet access services, is intensifying with the digital conversion of broadcasting. As broadcast programs are produced using digital technology and broadcast media are gradually changed to an interactive nature, the boundary between the broadcast area and the communication area is blurred. In other words, digitalization of information enables the bidirectional transmission of information irrespective of the type of communication network and broadcasting network, thereby making broadcasting services using communication networks and Internet services using cable networks. The broadcast communication convergence system will be described with reference to FIG. 1 below.

1 is a diagram schematically illustrating a structure of a general broadcast communication convergence system.

Referring to FIG. 1, an optical line termination (hereinafter referred to as 'OLT') from a broadcast service network 101 providing a broadcast service and a communication service network 103 providing a communication service. 105 is an optical termination device on the service providing network side as part of the optical subscriber network. A multiservice device that connects an optical subscriber network with other systems and consists of a service interface and protocol processing (hereinafter referred to as SIPP) device, a cable TV device, a transmission device, and a network management device. . In the OLT 105, broadcast services such as digital broadcasting, analog broadcasting, voice telephone, video service, and high-speed Internet of the broadcast service network 101, and communication services such as VOD signals and communication signals of the communication service network 103 are performed. To provide an optical signal, an electrical signal is converted into an optical signal. The optically-converted signal is used to bundle and send a single optical signal between the user and the service node. The OLT 105 transmits the optical signal using an optical cable between optical network units (hereinafter, referred to as 'ONU').

The ONU 107 is an optical termination device on the subscriber side of an optical communication network that provides a service interface to end users. That is, it is a network terminator for connecting to an optical subscriber system (fiber-to-the-user system) constituting the next generation communication network. Therefore, the ONU 107 implements high accessibility to users by accepting fiber to the curb (FTTC), fiber to the building (FTTB), fiber to the floor (FTTF), and fiber to the Office (FTTO). Optical and electrical signals are exchanged with each other. The ONU 107 performs photoelectric conversion for converting the optical signal into the electrical signal and transmits the photoelectrically converted signal to the user gateway 109. Here, the ONU 107 and the user gateway 109 are connected by using a bidirectional hybrid fiber coaxial cable (HFC) or a very high speed digital subscriber line (VDSL) that is a copper line. The user gateway 109 transmits the photoelectrically converted signals, that is, broadcast signals and communication signals, to user equipment using individual services, for example, TV (television), VOD, and personal computer (PC). It is connected and arbitrated to several other devices such as And a plurality of the ONUs 107 using the optical cable to the OLT 105 and exist between the OLT 105 and the user gateway 109. 1 shows that n ONUs 107 are connected to the OLT 107.

Data generated in the user device is transferred to the communication service network by performing a reverse process of the signal introduced into the user device. At this time, since the broadcast communication convergence service has the above structure, the number of optical paths between the OLT 105 and the ONUs is required as much as the number of the ONUs. For example, n optical lines were required for the n ONUs to be connected to the OLT 105. Therefore, if the number of ONUs increases, the number of optical lines, that is, the number of cores of optical cables should increase by the number of ONUs. That is, in the conventional broadcasting communication convergence system, the optical players connecting OLT and ONUs need the number of ONUs. There was a problem. In the OLT 105, the number of cores of the optical cable that the OLT 105 can accommodate is limited to 16 cores or 64 cores. For example, there is a problem in that the OLT should be added when the number of ONUs needs to increase due to an increase in subscribers of the broadcasting communication system. In addition, when using the above system, the user has a limited service area in the home, where the broadcast service and the communication service are provided in the home, so that the user cannot receive the service when the user leaves the home.

It is therefore an object of the present invention to provide a system for distributing optical lines in a broadcast communication convergence system.

Another object of the present invention is to provide a system for increasing the number of ONUs accessible in an OLT by distributing optical lines in a broadcast communication convergence system.                         

It is still another object of the present invention to provide a system for distributing optical lines such that a limited optical cable in a broadcasting communication convergence system does not increase an additional optical cable even with an increase in ONU.

The system of the present invention for achieving the above object; In a system for distributing optical lines in a broadcast communication convergence system, a broadcast signal and a communication signal are received through an external broadcast service network and a communication service network, and the received signals are converted into optical signals and converged into optical signals. An optical line terminal for transmitting in a wavelength division multiplexing scheme and an optical signal received from the optical line terminal are photoelectrically converted into a broadcast signal and a communication signal, and in the case of a broadcast signal, the broadcast signal is amplified and distributed and distributed. In the case of, the optical line splitter performs switching and multiplexing and then transmits the optical signal, and separates the optical signal received from the optical line splitter into a broadcast signal and a communication signal for photoelectric conversion, and processes upstream information transmitted from the user. Time-slots the broadcast signal and the communication signal selected for each user. Photoelectrically converts the optical network unit and the time slotted optical signal transmitted from the optical network unit, separates the time slotted signal for each service, and optically transmits upstream information from the user to the optical network unit. It is characterized by including an in-house gateway to.

Hereinafter, with reference to the accompanying drawings, preferred embodiments of the present invention will be described in detail. It should be noted that in the following description, only parts necessary for understanding the operation according to the present invention will be described, and descriptions of other parts will be omitted so as not to distract from the gist of the present invention.

2 is a diagram schematically illustrating a structure of a broadcast communication convergence system for distributing an optical line according to an embodiment of the present invention.

Referring to FIG. 2, the OLT 205 from the broadcast service network 201 providing a broadcast service and the communication service network 203 providing a communication service is an optical end device on the service providing network side as part of an optical subscriber network. to be. It is a multiservice device that connects the optical subscriber network with other systems, and is composed of a SIPP device, a cable TV device, a transmission device, and a network management device. In the OLT 205, broadcast services such as digital broadcasting, analog broadcasting, voice telephone, video service, and high-speed Internet of the broadcast service network 201, and communication services such as VOD signals and communication signals of the communication service network 203 are provided. To provide an optical signal, an electrical signal is converted into an optical signal. In this case, the OLT 205 synchronizes the digital signal based on time division multiplexing to ensure the quality of service (QoS) of the broadcast signal. A network (Synchronous Digital Hierarchy / Synchronous Optical NETwork, hereinafter referred to as SDH / SONET) signal. The communication signal is multiplexed by a Gigabit Ethernet signal.

In the OLT 205, the all-optical converted signal is used to bundle and transmit a single optical signal and is located between the user and the service node. The OLT 205 transmits the optical signal using an optical cable between the ONUs 209. At this time, the optical line divider 207 exists between the OLT 205 and the plurality of ONUs 209. Thus, the optical line divider 207 is used to divide a broadcast signal and a communication signal of an existing optical cable, distribute the line of the optical cable, and transmit the same to each ONU 209. Here, the optical line divider 207 will be described with reference to FIG. 3. The OLT 205 transmits the all-optical converted signal to the optical line splitter using the optical cable. Thus, the signal passing through the optical line splitter 207 is input to each ONU 209.

The ONU 209 is an optical termination device on the subscriber side of an optical communication network that provides a service interface to end users. That is, it is a network terminator for connecting to an optical subscriber system (fiber-to-the-user system) constituting the next generation communication network. Therefore, the ONU 209 implements high accessibility to users by accepting fiber to the curb (FTTC), fiber to the building (FTTB), fiber to the floor (FTTF), and fiber to the Office (FTTO). Optical and electrical signals are exchanged with each other.

The ONU 209 performing the above operation multiplexes the optical signal transmitted through the optical line splitter 207 into a broadcast signal and a communication signal, processes it, and then converts the optical signal into an optical signal having a type slot (Time Solt). Multiplexing is delivered to the user gateway 211. Herein, the operation of the ONU 209 will be described in detail.

In the ONU 209, a wavelength division multiplex (WDM) optical signal transmitted from the OLT 205 is demultiplexed and separated into a wavelength-specific signal, and photoelectric conversion is performed. The WDM optical signal is divided into a broadcast signal and a communication signal, and the broadcast signal transmits only the broadcast signal selected by the user using channel information selected for each user receiving the broadcast signal using a zapping protocol. The broadcast signal and the communication signal processed using the zapping protocol signal are time slotted and multiplexed into an optical signal and output. Ethernet upstream information from the user is optically converted and transmitted to the OLT 205. Thus, in the ONU 209, a broadcast signal and a communication signal desired by the user are provided to the user gateway 211.

 A plurality of ONUs 209 are connected to the OLT 205 using the optical cable and exist between the OLT 205 and the user gateway 211. 2 shows that n ONUs 209 are connected to the OLT 205.

Thus, the user gateway 211 receives an optical signal from the ONU, photoelectrically converts it into a time slotted signal, and distributes it to individual services, that is, to individual user equipments.

The user gateway 211 is distributed to respective devices of the user. The upstream information transmitted from the user and the broadcast channel information selected by the user are transmitted to the ONU 209. At this time, it is also possible to provide the broadcast service and the communication service to each device by using a wired method as in the conventional gateway. In addition, a wireless LAN wireless access device is additionally installed and used to provide the information to the user devices within a certain distance by wireless. In order to support the WLAN, a transcoder and an IP streamer (hereinafter, referred to as an 'IP Steramer') are used. The format of the information is converted for each service. The conversion of the format is an example of converting a video format such as ASF (Advanced Streaming File), MPEG (Motion Picture Experts Group) -2, etc. into a signal such as MPEG-4. The converted signal may again provide the wireless service to a user device provided with an individual service using the IP streamer. The user device may be an HDTV, a VOD, a computer, an audio, an internet home, a web pad, or the like. Thus, the user can expand and use the user service area received through the user gateway.

In addition, in the broadcast communication convergence system, a first optical cable connecting the OLT 205 and the optical line splitter 207, the optical line splitter 207, and the ONU are transmitted as the user signal is transmitted using the optical signal. And a second optical cable connecting the 209 and a third optical cable connecting the ONU 209 and the user gateway 211.

3 is a diagram schematically illustrating a structure of an optical line splitter in a broadcast communication convergence system according to an embodiment of the present invention.

Referring to FIG. 3, an optical WDM signal of the OLT 205 may be transmitted using the optical cable, and the optical line splitter 207 may be connected to a plurality of ONUs 209 using the received optical signal. It serves to distribute the optical line. In this case, the optical line splitter 207 will be described below.

Accordingly, the optical / electric converter 301 converts the optical signal input to the optical line splitter 207 into an electrical signal and outputs the optical / pre-converted signal to the demultiplexer 303. The demultiplexed signal is demultiplexed into a broadcast signal and a communication signal by the demultiplexer 303 to distinguish the signal. The demultiplexed broadcast signal is output to the amplifier 305 and the communication signal is output to the switch 309, respectively.

The amplifier 305 inputs the broadcast signal to amplify the broadcast signal. The reason for performing the amplification is to compensate for the strength of the signal lost in the transmission process. The amplified signal is output to the divider 307 again, and the divider 307 outputs the signal to each multiplexer using the amplified broadcast signal.

The demultiplexed communication signal is inputted from the switch 309 to switch the communication signal for each ONU 209 receiving the communication signal. Here it is possible to ensure the communication speed at the time of reception through the switch, the switch is applied a gigabit switch.

The output signals of the splitter 307 and the switch 309 are output to the multiplexer for input to the ONU 209, and the multiplexer 311 multiplexes the broadcast signal and the communication signal to the pre / optical converter 313. Will output The all-optical converter 313 receives the multiplexed signal, converts it into an optical signal, and transmits it to the ONU 209 through an optical cable.

 The optical line splitter 207 is used to distribute the optical line of the optical cable between the OLT 505 and the ONU 209, and the optical splitter is connected to the OLT 205 to connect the ONU 107. It is possible to increase the number, and the OLT 205 in accordance with the increase in the ONU 209 by expanding only the ray between the ONU 209 and the optical line splitter 207 in accordance with the increase in the ONU 209. You do not need to increase). Therefore, the number k of the ONUs 209 of the present invention to which the optical line splitter is applied has a larger value than the number n of the existing ONUs 107.

In addition, according to the present invention, it is possible to provide the broadcast service and the communication service to the user device through the same structure as that of the existing user gateway. In addition, it is preferable to apply the WLAN to the user service area. Not only can the user be provided with the service in the home, but the user can use the respective user devices by extending the service area near the house.

Meanwhile, in the detailed description of the present invention, specific embodiments have been described, but various modifications are possible without departing from the scope of the present invention. Therefore, the scope of the present invention should not be limited to the described embodiments, but should be defined not only by the scope of the following claims, but also by the equivalents of the claims.

The present invention as described above, by applying the optical line splitter and wireless LAN to the broadcast communication convergence system to distribute the limited optical line of the existing optical cable to play a role of increasing the acceptance limit of the ONU connected to the OLT. In addition, as the ONU increases, an optical path may be added to the optical line splitter and the ONU section, and the OLT may not be additionally installed. In addition, by applying a wireless LAN to the user gateway, it is possible for a user to extend a limited service area.

Claims (4)

A system for distributing optical lines in a broadcast communication convergence system, An optical line terminal for receiving a broadcast signal and a communication signal through an external broadcast service network and a communication service network, converting the received signals into an optical signal and fusing them into optical signals, and transmitting the optical signals by optical wavelength division multiplexing; The optical signal received from the optical line terminal is photoelectrically converted into a broadcast signal and a communication signal, and in the case of a broadcast signal, the broadcast signal is amplified and distributed. With optical line splitter to transmit, An optical network that optically converts an optical signal received from the optical line splitter into a broadcast signal and a communication signal, performs photoelectric conversion, processes upstream information transmitted from a user, and optically transmits the broadcast signal and communication signal selected for each user by time slotting the optical signal. Unit, An indoor gateway for photoelectrically converting the time slotted optical signal transmitted from the optical network unit, separating the time slotted signal for each service, and optically transmitting upstream information from the user to the optical network unit. A system for distributing optical lines in a broadcast communication convergence system. The method of claim 1, The optical line splitter includes a photoelectric converter for converting a wavelength division multiplexed optical signal transmitted from the optical line terminal into an electrical signal; A demultiplexer which receives a signal of the photoelectric converter and separates a communication signal from a broadcast signal; An amplifier for amplifying the broadcast signal separated by the demultiplexer; A distributor for distributing the amplified broadcast signal to each optical network unit; A switch for switching communication signals separated by the demultiplexer to each optical network unit; A multiplexer for multiplexing the broadcast signal of the distributor and the communication signal of the switch; And an all-optical converter for converting the signal multiplexed with the broadcast signal and the communication signal into an optical signal. The method of claim 2, And said switch uses a gigabit switch. The method of claim 1, And a transmission section from the optical line terminal to the user gateway comprises an optical cable.

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