JP2006033044A - Merged distribution system of broadcast and communication - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To distribute a video image efficiently by using optical fibers to be branched with no futility in a system for distributing data of a broadcast system and a communication system while merging. <P>SOLUTION: Number of systems is increased furthermore by distributing the optical fibers of a plurality of systems being connected from a plurality of optical amplifiers 9, and a first optical patch board 21 for recombining the systems arbitrarily is provided in a containing station so that the number of systems to be combined is increased. Number of branches of optical splitters 23 and 24 being provided in the way of route of each optical fiber system can be set to such that highest efficiency is attained while giving priority to the subscriber line of broadcast system. Degree of freedom can also be increased correspondingly in combination of systems on the first optical patch board 21 and use efficient of lines is enhanced. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a broadcasting and communication fusion distribution system, and is particularly suitable for use in a system that distributes broadcast information and communication information using a FTTH (Fiber to the Home) PON (Passive Optical Network) system. It is a thing.

  In Japan, terrestrial television broadcasting is being digitized. In 2011, digital terrestrial broadcasting will be implemented nationwide, and analog waves will be stopped. As part of this, terrestrial digital broadcasting started in April this year, but the target area is limited to major urban areas. On the other hand, at present, some cable TV operators are attempting to convert the contents of terrestrial digital broadcasts received in the broadcast target area into digital data and retransmit the digital broadcast data to areas that do not support broadcast. In this case, most cable TV operators transmit satellite broadcast data such as BS digital broadcasts and CS digital broadcasts as well as terrestrial digital broadcasts and original content provided by cable TV operators. .

  Therefore, the amount of data transmitted to the coaxial cable is enormous. Further, when data is transmitted using a coaxial cable, the transmission band is limited to a band of 770 MHz at the maximum, so the number of channels that can be transmitted is limited. That is, since the frequency of the UHF band radio wave used by terrestrial digital broadcasting has a frequency of 770 MHz or less, it can be transmitted to the coaxial cable at the same broadcasting frequency. On the other hand, since the frequency of radio waves used by satellite broadcasting exceeds 2 GHz, it must be converted into 770 MHz and retransmitted. As a result, broadcasting of all channels cannot be retransmitted to the coaxial cable, so the cable television company currently selects the channels to be transmitted.

  On the other hand, when looking at communication systems represented by the Internet and the like, the transition from conventional ADSL (Asymmetric Digital Subscriber Line) using a copper wire drawn for telephones to FTTH using an optical fiber as an access line is rapid. Is going on. There are two types of FTTH depending on how to connect the accommodation station and the subscriber's home. Similar to ADSL, there are two methods, the SS (Single Star) system that connects the accommodation station and the subscriber's house on a one-to-one basis, and the PON system that connects the accommodation station and the subscriber's house on a one-to-n basis. In the PON system, the optical fiber from the accommodation station is branched and delivered to a plurality of subscriber homes.

Recently, FTTH technology is being introduced to the distribution of broadcast data by the cable television operators described above. For example, a technique for realizing a high-speed LAN in a network system using an optical fiber and a coaxial cable has been proposed (see, for example, Patent Document 1). In addition, a system that provides services for individual subscribers using a conventional video broadcasting service network has also been proposed (for example, see Patent Document 2). In addition, a system that incorporates a video-on-demand service with respect to a conventional broadcast type CATV network has been proposed (see, for example, Patent Document 3).
JP 2001-285205 A JP-A-11-355750 JP-A-7-183870

  In particular, recently, a PON type FTTH service system that provides all the original content provided by the Internet connection, various types of digital broadcasting such as terrestrial / BS / CS, and cable television operators through a single optical fiber is also proposed. Has been experimentally implemented by some operators. In order to introduce this FTTH service system, it is necessary to change the coaxial cable used to distribute data to an optical fiber.

  When installing an optical fiber from the accommodation station to the subscriber's house, it is necessary to use a utility pole. To that end, it is necessary to acquire a right to use a utility pole from a communication carrier such as NTT or an electric power company such as TEPCO. However, it takes a lot of procedures to acquire the right to use the utility pole, and it takes a lot of time and cost to be approved after applying. In addition, when there are many users who wish to use a utility pole, only a specific person selected from among them acquires the right to use, so the right to use cannot often be acquired. Even if you can get it, it is extremely difficult to rent all the utility poles you want. Therefore, it is virtually impossible to newly borrow an electric pole and attach an optical fiber.

  By the way, when a radio wave interference occurs due to the influence of a high-rise building or topography when receiving a conventional analog television broadcast, the broadcast radio wave cannot be received well at home in the radio wave interference area. In order to avoid such inconvenience, conventionally, a common antenna has been installed at a point where radio interference is unlikely to occur, and a plurality of households in the radio interference area have been connected by the common antenna. Telephone poles are used to connect the common antenna to multiple households, and the right to use telephone poles already exists in the radio interference area. If an optical fiber is arranged using this vested right, no new application is required in the area of the vested right, so it is only necessary to rent a new utility pole only where the radio interference areas with vested rights are connected. Can be realized relatively efficiently.

  FIG. 5 is a diagram showing a configuration example on the accommodation station side in a conventional FTTH service system using the PON system. The system shown in FIG. 5 uses a single-core three-wave multiplexing WDM (optical wavelength division multiplexing) technology. From the broadcast data such as terrestrial / BS / CS sent from the head end and a network transmission device. The transmitted communication data is multiplexed through WDMMF (Optical Wavelength Multiplexing Filter). At this time, different waveforms of 1.55 μm for broadcasting (video), 1.31 μm for communication upstream, and 1.49 μm for communication downstream are coexisted in one optical fiber. In the PON system, an optical splitter is inserted in the middle of an optical fiber path so that the optical fiber is branched, and a single optical fiber can be shared by a plurality of users.

  In FIG. 5, the first mixer 1 mixes VHF band radio waves of terrestrial analog broadcasting. The second mixer 2 mixes UHF band radio waves for terrestrial analog broadcasting and UHF band radio waves for terrestrial digital broadcasting. The third mixer 3 mixes the VHF band radio wave output from the first mixer 1 and the UHF band radio wave output from the second mixer 2. The first head end 4 processes terrestrial analog / digital broadcast radio waves output from the third mixer 3 to generate terrestrial electrical signals. The second head end 5 processes satellite broadcast radio waves such as BS / CS to generate electric signals of satellite waves.

  The transmodulator 6 converts the electric signal of satellite broadcasting using the 2.6 GHz band into a 770 MHz band for a coaxial cable. The fourth mixer 7 mixes the ground wave electrical signal output from the first head end 4 and the satellite wave electrical signal output from the transmodulator 6. The electrical signals mixed here are all in the 770 MHz band. The optical modulator 8 converts an electric signal in the 770 MHz band into an optical signal of 1.55 μm. The optical amplifier 9 amplifies the intensity of the optical signal. One optical amplifier 9 outputs the amplified optical signal to 16 lines.

  An OLT (Optical Line Terminal) 10 is a station side transmission device (PON device) of an optical fiber subscriber line, and is connected to the Internet or the like to control communication. When establishing a connection with an ONU (Optical Network Unit) installed in the subscriber's home, the OLT 10 finds and authenticates the ONU of the communication partner. When receiving data, the transmission timing of the ONU is specified so that the frames do not collide. At the time of data transmission, a frame is transmitted by designating which ONU is addressed. Note that there is an upper limit on the number of ONUs that can be controlled by one OLT.

  The WDMF 11 multiplexes the broadcast (video) optical signal output from the optical amplifier 9 and the communication (network) optical signal output from the OLT 10, thereby enabling 1.55 μm broadcast and 1.31 μm upstream. Waveforms with different frequencies, such as communication and 1.49 μm downlink communication, coexist in one optical fiber.

  The optical patch panel 12 is for arbitrarily recombining a combination of a plurality of systems of optical fibers connected from a plurality of WDMMFs 11. The number of ONUs that can be controlled by one optical amplifier 9 is within a range in which the total loss on the transmission path from the optical amplifier 9 to the ONU falls within an allowable amount. The total loss on the transmission path is determined by the optical path length from the optical amplifier 9 to the ONU and the number of branches by the optical splitter 13. Therefore, the number of systems that can be controlled by one optical amplifier 9 differs depending on the path. Therefore, the optical patch panel 12 rearranges the combinations of optical fibers of a plurality of systems so that the total loss applied to each optical amplifier 9 is within an allowable range.

  The conventional FTTH service system configured as described above is a system that additionally broadcasts using a PON device developed for communication. The greatest feature of the PON system is that the optical fiber is branched into a plurality of parts along the route, but the maximum number of branches that can be branched by the PON system is 32. Most optical splitters 13 have a 32-branch configuration so that the total extension of the optical fiber can be suppressed even if the number of users increases.

  However, as described above, an ONU on the subscriber side can be connected to one optical amplifier 9 only within a predetermined allowable total loss range. Therefore, even if one optical fiber is branched into 32 by the optical splitter 13, all of them are not used up, and there is a problem that waste is increased.

  In addition, when targeting a radio interference area, almost 100% of users are subscribed to the broadcasting system, but the communication system has fewer subscribers than the broadcasting system. Therefore, the communication system has a problem that even if the optical fiber is branched into 32, all of them are not used up and waste is generated.

  Further, as described above, the number of ONUs that can be controlled by one OLT 10 (PON device) is limited. Therefore, when almost all of the optical splitters 13 are branched into 32, there is a problem that the number of necessary PON devices to be installed also increases.

  In addition, since satellite broadcasting is multiplexed after frequency conversion from 2.6 GHz to 770 MHz, a transmodulator 6 is required on the accommodation station side, and a set-top box or a dedicated tuner is required on the subscriber's home side. There was also a problem.

The present invention has been made to solve such a problem, and is an optical fiber branched in a system that fuses and distributes broadcast (video) data and communication (net) data. It is an object of the present invention to enable efficient video distribution using video without waste.
Another object of the present invention is to enable efficient distribution of network data in addition to video using a branched optical fiber without waste.

It is another object of the present invention to reduce the number of PON devices (OLT) installed on the accommodation station side.
In addition, the present invention eliminates the need for installation of dedicated equipment such as a transmodulator on the accommodation station side, a set-top box or a dedicated tuner on the subscriber's home side, and allows various broadcasting of terrestrial and satellite waves without special equipment. The purpose is to allow viewing and free Internet connection.

  In order to solve the above-described problems, in the broadcasting and communication integrated distribution system according to the present invention, an optical modulator that converts an electric signal of terrestrial broadcasting and satellite broadcasting supplied from a head end into an optical signal, and an optical modulator An optical amplifier for amplifying an optical signal output from the optical amplifier, a first optical patch panel for further distributing a plurality of systems of optical fibers connected from the optical amplifier to increase the number of systems and arbitrarily recombining the systems A station-side transmission device that controls communication on the network in cooperation with a home-side transmission device installed in the subscriber's home, a broadcast optical signal output from the first optical patch panel, and a station An optical wavelength multiplexing filter is provided, which multiplexes the optical signal of the communication system output from the side transmission device so that waveforms of different frequencies coexist in one optical fiber.

  In another aspect of the present invention, the optical fiber connected from the station-side transmission device is distributed to increase the number of systems, and includes a second optical patch panel for arbitrarily reconfiguring the combination of systems. The broadcasting optical signal output from the first optical patch board and the communication optical signal output from the second patch board are multiplexed.

  In another aspect of the present invention, the optical modulator converts an electric signal of terrestrial broadcasting and satellite broadcasting supplied from the head end through a pass-through into an optical signal.

  In another aspect of the present invention, a broadcast optical signal sent via the head end and a communication optical signal sent via the station-side transmission device are multiplexed by the optical wavelength multiplexing filter to the subscriber's home. In an integrated broadcasting and communication distribution system designed for distribution, a first optical patch panel for distributing optical fibers to increase the number of systems and arbitrarily recombination of the system combinations is more effective than an optical wavelength multiplexing filter. It is arranged on the head end side.

  In another aspect of the present invention, an optical modulator for converting an electric signal of terrestrial broadcasting and satellite broadcasting supplied from the head end into an optical signal between the head end and the first optical patch panel, and optical modulation And an optical amplifier that amplifies the optical signal output from the transmitter, and the optical modulator converts an electrical signal in a frequency band of terrestrial broadcasting and a frequency band of satellite broadcasting into an optical signal.

  In another aspect of the present invention, a second optical patch panel is provided between the station-side transmission device and the optical wavelength division filter to distribute optical fibers to increase the number of systems and to arbitrarily change the combination of systems. It is characterized by that.

  In another aspect of the present invention, a broadcast optical signal sent via a head end, an optical modulator and an optical amplifier in a receiving station, and a communication optical signal sent via a station side transmission device in the receiving station, In an integrated broadcasting and communication distribution system that distributes optical fiber to subscriber's homes, an optical patch panel for distributing optical fibers to increase the number of systems and arbitrarily recombination of system combinations is provided at the subsequent stage of the optical amplifier. It is characterized by being arranged.

  According to the present invention configured as described above, an optical patch panel for arbitrarily changing the combination of systems is provided immediately after the optical amplifier, and the number of systems is increased by distributing optical fibers in the optical patch panel. Therefore, the number of optical fiber systems to be combined increases as compared with the conventional case. As a result, the degree of freedom of combination of systems in the optical patch panel is increased, and the number of branches by the optical splitter provided in the middle of the path of each system ahead of the optical patch panel is given the highest priority over the line of the broadcasting subscriber. Each can be set to a number that improves efficiency, and the line usage efficiency can be improved.

  In addition, according to the present invention, a communication system line with fewer subscribers than the broadcast system is used in accordance with the number of branches by the optical splitter provided in the path of each system ahead of the optical patch panel. In combination with these lines, multiplexing can be performed by an optical wavelength multiplexing filter. As a result, communication data can be efficiently distributed using the branched optical fiber without waste.

  According to another feature of the present invention, as described above, the number of branches by the optical splitter in the middle of a plurality of paths is set to an appropriate number, and can be controlled by the station side transmission device. There are places where the number of branches is less than the maximum. An optical patch panel for distributing optical fibers to increase the number of systems and arbitrarily recombining the systems is also provided at the rear stage of the station-side transmission device. It can be arbitrarily selected according to the number of branches by the splitter. Thereby, it becomes possible to control more systems with one station side transmission apparatus, and the number of station side transmission apparatuses can be reduced.

  According to another aspect of the present invention, the optical modulator provided between the head end and the optical patch panel is an electrical signal in a frequency band corresponding to both a frequency band for terrestrial broadcasting and a frequency band for satellite broadcasting. Therefore, a transmodulator for converting the satellite broadcast frequency into the frequency for the coaxial cable becomes unnecessary on the accommodating station side. Further, since the satellite broadcast signal is optically transmitted to the subscriber's home without being frequency-converted, the number of channels is not limited, and all satellite broadcast channels can be transmitted. As a result, the subscriber's home can select and view a favorite channel from all the channels that have flowed, and there is no need to install a set-top box or a dedicated tuner. Therefore, it is possible to view various broadcasts of terrestrial and satellite waves without a special device, and the Internet connection can be freely made.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a diagram illustrating a configuration example on the accommodation station side of a combined broadcasting and communication distribution system according to the present embodiment using the PON system. In FIG. 1, components having the same functions as those shown in FIG. 5 are denoted by the same reference numerals. FIG. 2 is a diagram showing an overall schematic configuration of the broadcast and communication fusion distribution system according to the present embodiment. In FIG. 2, illustration of a part of the configuration shown in FIG. 1 is omitted for simplification of description.

  First, it demonstrates based on FIG. As shown in FIG. 2, the broadcasting / communication integrated distribution system according to the present embodiment uses a PON type single-core three-wave WDM technology, and includes a device on the accommodation station 100 side and a device on the subscriber's home 200 side. Are connected via an optical fiber 300.

  On the accommodation station 100 side, various broadcast data (video signals) such as terrestrial / BS / CS sent from the head end 51, and communication data (data signals) sent from the OLT 52, which is a network transmission device, Are multiplexed by WDMMF53. At this time, different waveforms of 1.55 μm for broadcasting, 1.31 μm for communication upstream, and 1.49 μm for communication downstream are coexisted in one optical fiber 300.

  In the optical communication system of the PON system, by inserting the optical splitter 54 in the middle of the path of the optical fiber 300, one optical fiber 300 is branched into a plurality of lines, and one optical fiber 300 is connected to a plurality of subscriber homes 200. (Only one is shown in FIG. 2).

  On the subscriber's home 200 side, a signal (a mixture of a video signal and a data signal) sent through the optical fiber 300 is input to the WDMF 55 and separated into a video signal and a data signal. The separated data signal (downstream signal of 1.49 μm) is processed by the D-ONU 56 and supplied to the personal computer 57 for display. Conversely, the data signal (1.31 μm upstream signal) supplied from the personal computer 57 to the D-ONU 56 is output to the optical fiber 300 via the WDMF 55 and delivered to the OLT 52 of the accommodation station 100. On the other hand, the video signal separated by the WDMF 55 in the subscriber's home 200 is processed by the V-ONU 58 and supplied to the television receiver 59 for display.

  Here, the D-ONU 56 and the V-ONU 58 notify the OLT 52 of their existence when establishing a connection with the OLT 52 installed in the accommodating station 100. At the time of data transmission, a frame is transmitted so as not to collide with data transmitted from other ONUs by measuring timing. At the time of data reception, only the frame addressed to itself is taken out and sent to the personal computer 57 or the television receiver 59.

  Next, the configuration in the accommodation station will be described with reference to FIG. In FIG. 1, a first mixer 1 mixes VHF band radio waves of terrestrial analog broadcasting. The second mixer 2 mixes UHF band radio waves for terrestrial analog broadcasting and UHF band radio waves for terrestrial digital broadcasting. The third mixer 3 mixes the VHF band radio wave output from the first mixer 1 and the UHF band radio wave output from the second mixer 2.

  The first head end 4 processes terrestrial analog / digital broadcast radio waves output from the third mixer 3 to generate terrestrial electrical signals. The second head end 5 processes satellite broadcast radio waves such as BS / CS to generate electric signals of satellite waves. These first and second head ends 4, 5 correspond to the head end 51 shown in FIG.

  The fourth mixer 7 mixes the ground wave electrical signal output from the first head end 4 and the satellite wave electrical signal output from the second head end 5. In this embodiment, the transmodulator 6 shown in FIG. 5 is not provided. An electric signal of satellite broadcasting using the 2.6 GHz band is transmitted to the fourth mixer 7 through the pass-through without changing the frequency band. Therefore, among the electric signals mixed by the fourth mixer 7, the ground wave electric signal is in the 770 MHz band, and the satellite wave electric signal is in the 2.6 GHz band.

  The optical modulator 18 converts the electrical signal output from the fourth mixer 7 into a 1.55 μm optical signal. The optical modulator 18 of the present embodiment converts the electric signals of terrestrial broadcasting and satellite broadcasting supplied from the first and second head ends 4 and 5 to the fourth mixer 7 by pass-through into optical signals. That is, the optical modulator 18 converts an electric signal including a frequency band for terrestrial broadcasting and a frequency band for satellite broadcasting into an optical signal of 1.55 μm. The optical amplifier 9 amplifies the optical signal output from the optical modulator 18. One optical amplifier 9 outputs the amplified optical signal to 16 lines.

  The first optical patch panel 21 further distributes a plurality of systems of optical fibers connected from the plurality of optical amplifiers 9 to increase the number of systems (in the example of FIG. 1, the number of systems is increased four times). This is for arbitrarily rearranging the combinations. The number of ONUs in the subscriber's house that can be controlled by one optical amplifier 9 is within a range where the total loss on the transmission path from the optical amplifier 9 to the ONU is within an allowable amount. The total loss on the transmission path is determined by the optical path length from the optical amplifier 9 to the ONU and the number of branches by the optical splitter. Therefore, the number of systems that can be controlled by one optical amplifier 9 differs depending on the path. Therefore, the first optical patch panel 21 recombines a combination of a plurality of systems of optical fibers so that the total loss applied to each optical amplifier 9 is within an allowable range.

  The OLT 10 (corresponding to the OLT 52 shown in FIG. 2) is a station side transmission device (PON device) of an optical fiber subscriber line, and is connected to the Internet and controls communication. When establishing a connection with an ONU installed in a subscriber's home, the OLT 10 finds and authenticates a communication partner ONU. When receiving data, the transmission timing of the ONU is specified so that the frames do not collide. At the time of data transmission, a frame is transmitted by designating which ONU is addressed. There is an upper limit to the number of ONUs that can be controlled by one OLT 10.

  The second optical patch panel 22 further distributes a plurality of optical fibers connected from the OLT 10 to increase the number of systems (in the example of FIG. 1, the number of systems is increased four times), and any combination of systems is possible. It is for rearranging. In general, the communication system has fewer subscribers than the broadcast system. When an optical fiber is attached to a radio interference area, video subscribers are almost 100%, whereas communication (net) subscribers are about 30%. Therefore, in the second optical patch panel 22, the range of the number of branches that can be controlled by one OLT 10 based on the number of branches by the optical splitter provided in the route from the OLT 10 to the ONU and the number of communication subscribers. Recombination of a plurality of optical fiber combinations so as to be inside.

  The WDMF 11 multiplexes the broadcast optical signal output from the first optical patch board 21 and the communication optical signal output from the second optical patch board 22, thereby transmitting a 1.55 μm broadcast. (Video), waveforms having different frequencies such as 1.31 μm upstream communication and 1.49 μm downstream communication coexist in one optical fiber. One of the plurality of WDMMFs 11 shown in FIG. 1 corresponds to the WDMF 53 shown in FIG.

  The third optical patch panel 12 is for arbitrarily recombining a combination of a plurality of systems of optical fibers connected from a plurality of WDMMFs 11 so that the total loss applied to each optical amplifier 9 is within an allowable range.

  In the broadcasting / communication integrated distribution system according to the present embodiment configured as described above, the first optical patch panel 21 is provided in the preceding stage (head end 4, 5 side) of the WDMF 11, and the number of systems is increased there. Therefore, the number of systems to be combined by the optical patch board is increased compared to the conventional system. Thereby, the number of branches by the optical splitter provided in the path of each system outside the accommodating station can be set to the most efficient number with priority given to the broadcast subscriber line. In the example of FIG. 1, an 8-branch optical splitter 23 and a 16-branch optical splitter 24 are connected to an optical fiber of an arbitrary system.

  For example, when an optical fiber is attached to a radio interference area, the area is relatively small, and the number of subscriber houses included in the area may be 32 or less, 16 or less, or 8 or less. Even in such an area, it is wasteful to uniformly use the 32-branch optical splitter 13 as in the prior art, and the use efficiency of the line is extremely deteriorated.

  On the other hand, in the case of this embodiment, unlike the conventional method in which many branches are secured by the optical splitter 13 immediately before the subscriber's house and a large number of lines are secured, the branches are previously taken inside the accommodation station. Increasing the number of systems. For this reason, the total number of lines can be ensured in the same way as before, without taking so many branches at the optical splitters 23 and 24 immediately before the subscriber's house. In addition, the number of branches of the optical splitters 23 and 24 is determined according to the number of lines actually used in the radio wave interference area, and the first optical patch panel 21 is considered in consideration of the number of branches and the optical path length of the transmission path. A combination of systems can be arbitrarily determined. Thereby, the freedom degree of the combination of a system | strain becomes high and the use efficiency of a line | wire can be improved significantly.

  Further, according to the present embodiment, since the second optical patch panel 22 is also provided between the OLT 10 and the WDMF 11, communication lines having fewer subscribers than the broadcast system are connected to the optical splitters 23 and 24. It is possible to multiplex a broadcast signal and a communication signal by the WDMF 11 in combination with an appropriate broadcast line according to the number of branches. For example, an 8-branch optical splitter 23 is used for an area where the number of communication subscribers is 8 or less, and a 16-branch optical splitter 24 is used for an area where the number of communication subscribers is 16 or less. The combination can be selected as follows. Thereby, it is possible to improve the use efficiency of a line by using an optical fiber without waste even for communication data. Moreover, it becomes possible to control more systems with one OLT 10, and the number of installed OLTs 10 can be reduced.

  In the present embodiment, the optical modulator 18 converts the electrical signal into an optical signal in a frequency band corresponding to both the frequency band of the terrestrial broadcast and the frequency band of the satellite broadcast. A transmodulator that converts the frequency to the frequency for the coaxial cable becomes unnecessary on the accommodation station side. Further, since the satellite broadcast signal is optically transmitted to the subscriber's home without being frequency-converted, the number of channels is not limited, and all satellite broadcast channels can be transmitted. As a result, the subscriber's home can select and view a favorite channel from all the channels that have flowed, and there is no need to install a set-top box or a dedicated tuner. Therefore, it is possible to view various broadcasts of terrestrial and satellite waves without a special device, and the Internet connection can be freely made.

  In the above-described embodiment, the system using the single-core three-wave multiplexing WDM technology as shown in FIG. 2 has been described, but the present invention is not limited to this. For example, the present invention can be applied to a two-core video / data separation type system as shown in FIG.

  In the case of the two-core video / data separation type system shown in FIG. 3, on the accommodating station 100 side, various broadcast data (video signals) such as terrestrial / BS / CS sent from the head end 51 and sent from the OLT 52 are sent. Communication data (data signal) is transmitted to separate optical fibers 300a and 300b without multiplexing.

  Then, by inserting the optical splitters 54a and 54b in the middle of the paths of the optical fibers 300a and 300b, the optical fibers 300a and 300b are branched into a plurality of pieces, respectively, and the two optical fibers 300a and 300b are divided into a plurality of subscriber homes. 200 (only one is shown in FIG. 2).

  At the subscriber's home 200 side, the video signal transmitted through the optical fiber 300a is input to the V-ONU 58, and the data signal transmitted through the optical fiber 300b is input to the D-ONU 56. The video signal processed by the V-ONU 58 is supplied to the television receiver 59 and displayed. The data signal processed by the D-ONU 56 is supplied to the personal computer 57 and displayed.

  When the system is configured as shown in FIG. 3, the interior of the accommodation station 100 side is configured as shown in FIG. The configuration shown in FIG. 4 corresponds to a configuration in which the WDMF 11 is omitted from the configuration of FIG. 1 and the broadcasting system and the communication system are separated. In this case, a plurality of optical splitters 23 and 24 are individually connected to a plurality of optical fibers extending from the second optical patch panel 22. In the case of such a two-core system, the WDMMF 11 is unnecessary as compared with the single-core system, so that the distribution / communication distance is long and the number of branches to the subscriber's home is less likely to occur.

  Also in such a two-core system, the first optical patch panel 21 is provided in the subsequent stage of the optical amplifier 9 in the broadcasting system as in the single-core system, so that the optical splitters 23 and 24 are provided. The number of branches can be set to a number that gives the highest efficiency by giving priority to the broadcast subscriber line. Since the combination of systems in the first optical patch panel 21 can be arbitrarily determined in consideration of the number of branches of the optical splitters 23 and 24 and the optical path length of the transmission path, the degree of freedom of combination of systems is increased. The line usage efficiency can be greatly improved.

  Also, in the two-core system shown in FIG. 4, since the second optical patch panel 22 is provided at the subsequent stage of the OLT 10, the number of branches by the optical splitters 23 and 24 is also determined for the communication system subscriber. Can be set to the most efficient numbers in consideration of the number of lines. Then, the combination of systems in the second optical patch panel 22 can be arbitrarily determined in consideration of the number of branches of the optical splitters 23 and 24 and the number of communication system subscribers. The use efficiency of the line can be improved by using the fiber without waste. In addition, the number of installed OLTs 10 can be reduced.

  In the two-core system shown in FIG. 4, the optical modulator 18 converts an electrical signal into an optical signal in a frequency band corresponding to both the frequency band of terrestrial broadcasting and the frequency band of satellite broadcasting. Therefore, a transmodulator that converts the frequency of satellite broadcasting into a frequency for a coaxial cable becomes unnecessary on the accommodating station side. Further, since the satellite broadcast signal is optically transmitted to the subscriber's home without being frequency-converted, the number of channels is not limited, and all satellite broadcast channels can be transmitted. As a result, the subscriber's home can select and view a favorite channel from all the channels that have flowed, and there is no need to install a set-top box or a dedicated tuner. Therefore, it is possible to view various broadcasts of terrestrial and satellite waves without a special device, and the Internet connection can be freely made.

  Moreover, although the said embodiment demonstrated the example which provides the 2nd optical patch panel 22 for the purpose of reducing the installation number of OLT10, this invention is not limited to this. For example, the second optical patch panel 22 may not be provided if the purpose is to at least increase the use efficiency of the broadcasting line.

  Further, in the above embodiment, the optical modulator 18 corresponding to the frequency band of satellite broadcasting is provided in order to eliminate the need for dedicated equipment such as a transmodulator on the accommodation station side and a set-top box on the subscriber premises side. However, the present invention is not limited to this. For example, the conventional optical modulator 8 may be used in place of the optical modulator 18 if the purpose is to at least increase the use efficiency of the broadcast system line.

  Moreover, in the said embodiment, although the 3rd optical patch board 12 is also provided in the back | latter stage side of the 1st optical patch board 21, the 3rd optical patch board 12 is not an essential structure for this invention.

  In addition, each of the above-described embodiments is merely an example of the embodiment for carrying out the present invention, and the technical scope of the present invention should not be construed in a limited manner. In other words, the present invention can be implemented in various forms without departing from the spirit or main features thereof.

  The present invention is useful for a system that distributes broadcast information and communication information using the FTTH PON system.

It is a figure which shows the structural example by the side of the accommodation station of the broadcasting and communication integrated delivery system by this embodiment using a PON system. It is a figure which shows the whole schematic structure of the fusion delivery system of broadcasting and communication by this embodiment. It is a figure which shows the modification of the whole schematic structure of the fusion delivery system of broadcasting and communication by this embodiment. It is a figure which shows the structural example by the side of the accommodation station of the fusion | distribution delivery system of broadcasting and communication which concerns on the modification shown in FIG. It is a figure which shows the structural example by the side of the accommodation station in the conventional FTTH service system.

Explanation of symbols

Headend 9 Optical amplifier 10 OLT
11 WDMMF
18 Optical Modulator 21 First Optical Patch Panel 22 Second Optical Patch Panel 23 8-Branch Optical Splitter 24 16-Branch Optical Splitter

Claims (7)

An optical modulator that converts an electric signal of terrestrial broadcasting and satellite broadcasting supplied from the head end into an optical signal;
An optical amplifier for amplifying an optical signal output from the optical modulator;
A first optical patch panel for further distributing a plurality of optical fibers connected from the optical amplifier to increase the number of systems, and arbitrarily recombining the combinations of systems;
A station-side transmission device that controls communication on a network in cooperation with a home-side transmission device installed in a subscriber's house;
By multiplexing the broadcast optical signal output from the first optical patch panel and the communication optical signal output from the station-side transmission device, waveforms of different frequencies can be obtained with one optical fiber. A broadcasting and communication fusion distribution system characterized by comprising an optical wavelength multiplexing filter that coexists in the network. Distributing the optical fiber connected from the station-side transmission device to increase the number of systems, comprising a second optical patch panel for arbitrarily reconfiguring the combination of systems,
The optical wavelength multiplexing filter multiplexes a broadcast optical signal output from the first optical patch board and a communication optical signal output from the second patch board. The integrated distribution system for broadcasting and communication according to claim 1. The broadcast and communication fusion distribution according to claim 1 or 2, wherein the optical modulator converts an electric signal of terrestrial broadcasting and satellite broadcasting supplied from the head end through a pass-through into an optical signal. system. Broadcasting configured to multiplex a broadcast optical signal sent via the head end and a communication optical signal sent via the station-side transmission device by an optical wavelength multiplexing filter and deliver it to the subscriber's home. In the fusion distribution system of communication and communication,
Broadcasting characterized in that a first optical patch panel for distributing optical fibers to increase the number of systems and arbitrarily recombining the systems is disposed on the head end side with respect to the optical wavelength multiplexing filter. Communication fusion distribution system. An optical modulator that converts an electric signal of terrestrial broadcasting and satellite broadcasting supplied from the head end into an optical signal between the head end and the first optical patch panel;
An optical amplifier that amplifies the optical signal output from the optical modulator,
5. The broadcast and communication fusion distribution system according to claim 4, wherein the optical modulator converts an electric signal in the frequency band of the terrestrial broadcast and the frequency band of the satellite broadcast into an optical signal. A second optical patch panel is provided between the station-side transmission device and the optical wavelength division filter to distribute optical fibers to increase the number of systems and to arbitrarily change the combination of systems. The fusion distribution system for broadcasting and communication according to claim 4 or 5. Broadcast-system optical signals sent via the head end, optical modulator and optical amplifier in the accommodation station and communication-system optical signals sent via the station-side transmission device in the accommodation station are distributed to the subscriber's home. In the integrated broadcasting and communication distribution system,
An integrated broadcasting and communication distribution system characterized in that an optical patch panel for distributing optical fibers to increase the number of systems and arbitrarily recombining the systems is disposed after the optical amplifier.

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