CN100355285C - Device for elctro/optical emitter and receiver providing combined broadcast signal via user network - Google Patents
Device for elctro/optical emitter and receiver providing combined broadcast signal via user network Download PDFInfo
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- CN100355285C CN100355285C CNB2004100869738A CN200410086973A CN100355285C CN 100355285 C CN100355285 C CN 100355285C CN B2004100869738 A CNB2004100869738 A CN B2004100869738A CN 200410086973 A CN200410086973 A CN 200410086973A CN 100355285 C CN100355285 C CN 100355285C
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Abstract
To couple and provide broadcast signals through an optical subscriber network. A photoelectric transmitter/receiver system includes: an electro-optical transmission unit for receiving a satellite broadcast signal and a CATV broadcast signal, coupling these signals into a signal of a single band, then converting the coupled signal into an optical signal of a predetermined wavelength of an optical subscriber network, and transmitting the converted optical signal; and a photoelectric reception unit for receiving an optical signal transmitted by the electro-optical transmission unit, converting the optical signal into an RF broadcast signal, separating the converted RF broadcast signal into a satellite broadcast signal and a CATV broadcast signal, and providing the broadcast signals to a subscriber. Thus, a satellite broadcast and a CATV broadcast can be simultaneously served to a subscriber by one system.
Description
Technical field
The present invention relates to the broadcast communication field, relate in particular to can simultaneous adaptation CATV a kind of device that is used for transmitter and receiver of broadcasting and satellite broadcasting.
Background technology
Nowadays, be used to communicate by letter or the foundation structure broadcasted is divided into varied.The radio network of having developed is divided into terrestrial broadcasting, CATV and satellite broadcast network, and according to position and the performance used, the communication network of having developed is divided into all kinds communication network that comprises wire/wireless communication.Because these network infrastructures can not satisfy the set service integration broadcasting in the current network that the multimedia service therein of subscriber expection is a main flow and communicate by letters, so increasing demand and expectation for the comprehensive network foundation structure that can realize gathering business.
Therefore, developed some use transmission lines and receiver so far the method for comprehensive broadcasting and communication service is provided, the realization of these methods is by using transmission channel separating and receiver that broadcasting service is offered user's method and communication service being provided the combination of this subscriber's method.And, because following user network will overcome the shortcoming of active user's network and be that the user provides bigger bandwidth and miscellaneous service with the low cost, extensively introduced for example have a little to the EPON (PON) of multipoint configuration to family optical fiber (FTTH) or (FTTC) type network structure of the kerb (curb) that arrives that Fiber To The Curb.
Make with the PON structure of light medium and be introduced into as data, picture (broadcasting) and telephone service being offered user's a kind of collective communication and the proper method of broadcasting with low cost as a FTTH or a FTTC network part.This PON structure has been used a kind of wavelength division method, uses and divides other wavelength transmission to upload and data downloaded, and in the method, by adding an independent wavelength additional broadcasting service is sent to the user easily.Owing to broadcasting service is provided to user's method be equivalent to conventional hybrid optical fiber/coaxial cable (HFC) method in a structure by adding independent wavelength, thereby this method might be used a traditional set-top box (STB).Therefore the user is familiar with using this method.
Current general domestic consumer is to use PC to obtain the Internet service and VOD service from the Internet service provider (ISPs), and uses the various media of for example direct land ripple, CATV radio network or artificial satellite to receive the multiplex broadcasting business from TV station.
But because existing broadcasting service has been used various media, when user expectation was used various broadcasting service, this user must be equipped with the suitable system at different business.That is, need the system of a cable system and for example STB to use the CATV broadcasting service; Need an independent satellite antenna and a STB to use satellite broadcast service; For example Internet protocol (IP) digital subscriber line access multiplexing (DSLAM) system and the modulator-demodulator independent with needs use the VOD business.Because various broadcasting services are not gathered as yet, thereby the user is necessary for its different broadcasting service of use and pays more expense.
Therefore, extensive exploitation receive the technology of internet and broadcasting service through TV with communicate by letter by set broadcasting, and after deliberation through and utilization a communication network that the technology of various types of broadcasting services is provided by independent medium.
In order to realize broadcasting and the set business of communicating by letter, advised a kind of method of using the existing cable network, by covering on the existing communication circuit that light signal provides the method for broadcasting service and by IP packet and online transfer agreement (RTP) being added to the method for the set broadcasting service of internet.This method is used a kind of hfc plant, and it can make the existing cable system in the radio network adapt to for example data communication service of VHSI very high speed internet business and so on.
But,,, and be not easy to adapt to the business of other method so this traditional user access network not can do with the internet message volume of sharp increase because traditional user access network is confined to bandwidth is offered the user.Because the FTTH such as PON or the network of FTTC type are proposed the narrow bandwidth that overcomes user access network, and set broadcasting provides a kind of foundation structure of optic network with communicating by letter with low cost, so the network of this FTTH or FTTC type is as the user access network in future and noticeable.
Be proposed to be used in the middle of broadcasting and the conventional network structure of communicate by letter, Fig. 1 is to use the configuration schematic diagram of the traditional C ATV network that has the HFC radio network now.
This catv network comprises a generation and provides the program of broadcast program that device (PP) 101 is provided; By changing channel comprising a system operation device (SO) 102 that offers the user from the broadcasting services of PP 101 programs that receive and that produce certainly; Broadcast singal is transferred to the CATV transmission network 103 of SO 102; With a CATV user distribution network 104 that broadcast singal is transferred to user 105 from SO 102.
This CATV user distribution network 104 is referred to as hfc plant, because optical cable and coaxial cable mix use between distribution center 107 and user 105.And this CATV user distribution network 104 can provide CATV professional and internet business.
This SO 102 is that a business provides device, comprises and broadcasts funtion part 106, and the content that receives is sent to the user or the advertisement with insertion voluntarily or the received content of subtitle are sent to the user; And the distribution center 107 that is used to carry broadcast singal.
Utilize the main purpose of the catv network of HFC to provide the CATV broadcasting service, attempt the combination of internet business, VOD service and telephone service by some bandwidth of utilizing catv network, and the catv network that utilizes this HFC simultaneously provides commercial service by set broadcasting with communicating by letter in the current technology that becomes the strongest recommendation.But because this catv network is one only to be used for the network of CATV and the Internet service, so the user can not receive the broadcasting of satellite, satellite broadcasting then is that current another uses the multiplex broadcasting network of catv network.
Fig. 2 is to use the conceptual schematic view of traditional digital satellite broadcasting business of satellite.Be different from the broadcasting station and broadcast data is sent to be placed on each regional relay base and this relay base sends to this broadcast data the terrestrial broadcasting of each family again, the method for satellite broadcasting is to use artificial satellite 202 that the programs that provide device 201 to provide from the channel that calls PP are transmitted into ground by the emitting electrons ripple.This business is provided with the name of digital satellite broadcasting at present in Korea S, and for using this business, needs additional expense and equipment (satellite antenna and a STB).
But the complementary network of a telephone wire 204 provides VOD or Internet service because the design of satellite broadcasting for example needs, and needs additional cost, so this satellite broadcasting has some shortcomings providing in set broadcasting and the service of communicating by letter.And, broadcasting-satellite service can not with this CATV broadcasting service exchange message content.
Summary of the invention
The invention provides a kind of device that is used for one electricity/optical transmitter and receiver, this transmitter and receiver provide a kind of broadcast singal of combination through a smooth user network, use and for example wherein to utilize a FTTH of the optical cable of ether PON (EPON) and so on or the optical subscriber network of FTTC type, provide a service by the multiplex broadcasting of gathering for example CATV and satellite broadcasting and so on is professional.
According to an aspect of the present invention, be provided for a kind of device of one electricity/optical transmitter and receiver, it receives a satellite broadcast signal and a CATV broadcast singal, make up this two broadcast singals, and the broadcast singal of this combination is offered the user through an optical subscriber network, this device comprises: the electrical-optical transmitter, receiving satellite broadcast signal and CATV broadcast singal, these two broadcast singals are combined into the single band signal, according to this light user network this single band conversion of signals is become to have a light signal of predetermined wavelength, and send this light signal through this light user network; With a light-electric receiver, the light signal that reception sends from this electrical-optical transmitter, this light signal is converted to a RF broadcast singal, the RF broadcast singal that utilizes the difference between the frequency band of this satellite broadcast signal and this CATV broadcast singal to change is divided into satellite broadcast signal and CATV broadcast singal, and the satellite broadcast signal of this division and CATV broadcast singal are offered the user.
This electrical-optical transmitter preferably includes: a LNB module is received in the satellite broadcast signal in the predetermined frequency band; One RF combiner is combined into a frequency band to this satellite broadcasting that is received by this LNB module and this CATV broadcast singal; With an electrical to optical converter, the RF conversion of signals that will make up according to this light user network becomes one to have a wavelength light signal, and by this light user network this light signal is transmitted into this light-electric receiver.
In this case, this electrical-optical transmitter preferably further comprises: a DC bias unit, deletion can be included in by the DC composition in the RF broadcast singal of the CATV broadcast singal of this satellite broadcast signal of this LNB module reception and this reception.And this electrical-optical transmitter preferably further comprises: a RF signal level controller remains on a predetermined level with the RF signal of this satellite broadcast signal and this CATV broadcast singal.At this moment, this RF signal level controller preferably includes: a RF amplifier is amplified to a prearranged signal level to this satellite broadcast signal or this CATV broadcast singal.
And this electrical-optical transmitter preferably further comprises: a RF signal level controller, and remaining on a predetermined level by this RF signal in the single band of this RF combiner combination.This electrical-optical transmitter preferably further comprises: an impedance matching unit, and this RF broadcast singal and this electrical-optical transmitter coupling by this RF combiner combination.This electrical-optical transmitter preferably further comprises: an optical signal gain controller, control the power of this electrical to optical converter, so as according to this light user network with this power invariability remain on a predetermined level.
This light-electric receiver preferably includes: an electro-optic detector converts an optical wavelength signal that sends by this light user network to a RF signal; With a RF distributor, utilize the difference between the frequency band of this satellite broadcast signal and this CATV broadcast singal that this RF division of signal of being changed by this electro-optic detector is become this satellite broadcast signal and this CATV broadcast singal, and the satellite broadcast signal of this division and CATV broadcast singal are provided to the associated user.
In this case, this light-electric receiver preferably further comprises: an impedance matching unit, and the RF signal of changing by this electro-optic detector and this light-electric receiver coupling.This light-electric receiver preferably further comprises: a RF amplifier is amplified to the RF signal of this conversion one level of being scheduled to and the RF signal of this amplification is sent to this RF distributor.This RF distributor preferably includes: a low frequency bandpass filter, only by this CATV broadcast singal from this input rf signal; And a high freguency bandpass filter, only by this satellite broadcast signal from this input rf signal.
This light-electric receiver preferably further comprises: a RF signal level controller remains on a predetermined level with the RF signal of this satellite broadcast signal and this CATV broadcast singal.At this moment, this RF signal level controller preferably includes: a RF amplifier is amplified to a prearranged signal level to this satellite broadcast signal or this CATV broadcast singal.
And this light-electric receiver preferably further comprises: a DC bias unit, deletion can be included in the DC composition from the RF broadcast singal of this satellite broadcast signal of this RF distributor output and this CATV broadcast singal.
Description of drawings
By the detailed description of reference accompanying drawing to most preferred embodiment, above-mentioned and further feature of the present invention and advantage will become obvious, wherein:
Fig. 1 is to use the configuration schematic diagram of the traditional C ATV network of existing HFC radio network;
Fig. 2 is to use the conceptual schematic view of traditional digital satellite broadcasting of satellite;
Fig. 3 is the block diagram of a smooth user network according to an embodiment of the invention;
Fig. 4 is the block diagram of the connecting system of the collective communication that uses in an EPON and broadcasting;
Fig. 5 is the block diagram of electrical-optical transmitter according to an embodiment of the invention; With
Fig. 6 is the block diagram of light-electric receiver according to an embodiment of the invention;
Embodiment
To more completely describe the present invention subsequently, in its accompanying drawing embodiments of the invention have been shown with reference to this accompanying drawing.
In the PON of a current suggestion, might utilize the separation simulation wavelength that the multicasting business of for example CATV broadcasting and satellite broadcasting and so on is offered a user according to the fundamental characteristics of the broadcasting in the download directions.In the network configuration of this FTTH or FTTC type, provide two kinds of methods of CATV broadcasting service and broadcasting-satellite service to exist jointly.
In first method of broadcasting service is provided, broadcasting service is divided into the optical wavelength of separation, owing to easily a new optical wavelength is added in the formation of the FTTH of PON and so on for example or FTTC type network, broadcasts (50-870MHz) and satellite broadcasting (950-2050MHz) so the optical wavelength of separating is assigned to CATV.In the method, must multiplexingly be somebody's turn to do the optical wavelength that separate owing to constitute the parts of this network, so need be used to constitute the extra charge of this network with demultiplexing.
Provide in second method of broadcasting service with single optical wavelength at the RF signal by multiplexed CATV broadcasting and satellite broadcasting, the existing parts that constitute this network needn't change because of the combination or the division of RF signal at a transmission/receiving terminal.
Nowadays, xDSL (digital subscriber line) network and hfc plant are most popular in the user access network of Internet service is provided.But owing to can offer the restriction of user's bandwidth, this xDSL network and hfc plant not can do with the sharp increase of internet business.
As the shortcoming that overcomes active user's access network and with low cost broadband and miscellaneous service are offered user's a kind of following user access network, for example the FTTH of PON and so on or FTTC network are noticeable.
The PON structure of using optical medium is divided into ATM PON (APON) and EPON.In this PON structure, a kind of use with different wavelength be used to upload with the wavelength division method of download data transmissions and a kind of multicasting business that provides by separate wavelengths being added to this network be most promising suggesting method to user's method.
A kind of method is disclosed in an embodiment of the present invention, do not use the separate broadcast circuit to provide unidirectional multichannel CATV and broadcasting-satellite service and data communication service when side by side adapting to the method for broadcasting of this CATV broadcasting and this satellite broadcasting and the set business of communicating by letter in the smooth user network at for example FTTH or FTTC network and so on uniline when using by recovery, an electrical-optical transmitter and a light-electric receiver can side by side support this CATV to broadcast and the broadcast singal of two kinds of methods of this satellite broadcasting.
Fig. 3 is the block diagram of a smooth user network according to an embodiment of the invention.Fig. 3 is illustrated in the configuration of the connecting system among the EPON and the structure of light user network.
Referring to Fig. 3, this light user network comprise one belong to be connecting system optical line terminal (OLT) 304, a wavelength division multiplexing (WDM) MUX 305, a WDM DEMUX 307, a decomposer 306, belongs to is the Optical Network Terminal (ONT) or the optical network unit (ONU) 308 of subscriber unit.
OLT 304 coupling one CATV broadcast singal 301, a satellite broadcast signal 302 and internet data 303 are distributed to the user to matched data, and are comprised broadcast transmitter 311 and data transmitter 312.
The fill order to the broadcast transmitter 311 of sending function CATV broadcast singal 301 and satellite broadcast signal 302 convert to other light signal of branch (1530nm, 1550nm) and multiplexing and send this light signal.
In this EPON, carry out the internet data communication, use download light signal (an OLT output signal) wavelength of 1490nm, and use 1310nm to upload light signal (an OLT input signal) wavelength as data as data.The output wavelength of optical signal (1550nm) of broadcast transmitter 311 also must be different from the input and output wavelength of optical signal of data transmitter 312.
The output wavelength of optical signal of this broadcast transmitter 311 is then according to collocation method and difference.Promptly, when RF light transmission/receiver module disposes with this satellite broadcast signal 302 at this CATV broadcast singal 301 respectively, (for example need two wavelength of optical signal, 1530nm and 1550nm), and when disposing the RF light transmission/receiver module of a set with this satellite broadcast signal 302, need a wavelength of optical signal (for example 1550nm) at this CATV broadcast singal 301.
The wavelength of optical signal of broadcast transmitter 311 from be included in OLT 304 and data transmitter 312 outputs is imported into this WDM MUX 305 that is used to send, by optical multiplexing in single optical fiber, and export as downloading light signal, and import the light signal of uploading by these data transmitter 312 couplings one.Therefore, in an optical link, exist three or more light signal that broadcasting and the set business of communicating by letter are provided with different wave length.That is, data and multiplexed multicasting signal are sent in single optical link by a collection of network.Decomposer 306 is passive devices, expands the number of users in PON and can expand to 1: 64.
Wherein, because EPON is used as the example of user network, wherein send and receive a separated network, for example subway (metro) Ethernet can be adapted to as user network, even and the optical fiber of this application be not that single optical fiber also well moves.And the WDM MUX 305 that is used for sending can be used as functional block and be included in this OLT 304.The WDM DEMUX 307 that is used to receive is passive devices that are placed on the user place, being divided into a broadcasting light signal and a data light signal by this broadcast transmitter 311 of WDM MUX 305 optical multiplexings and the wavelength of optical signal of this data transmitter 312.
According to the type of business, ONU or ONT 308 convert the light signal that is divided into broadcasting light signal and data light signal to the signal of telecommunication, and this signal of telecommunication is sent to a business platform, for example the satellite STB309 in the user family, CATV STB310 and PC 322.Wherein, according to characteristic separately, business platform can comprise a plurality of platforms or a platform.
Fig. 4 is the block diagram as a connecting system (OLT) of collective communication that uses in an EPON that is configured for an a kind of example of gathering the broadcasting and the FTTH network of communication service and broadcasting.
One OLT broadcast transmitter 401 comprises a CATV and satellite electrical-optical transmitter 404, an image intensifer 405, a 1*N decomposer 406 and WDM coupler 407.
OLT broadcast transmitter 401 receives a CATV broadcasting RF signal 402 and a satellite broadcasting RF signal 403, use CATV and satellite electrical-optical transmitter 404 that the frequency band of these two RF signals is merged into a RF frequency band, and a RF conversion of signals that merges is a single optical wavelength.For this single optical wavelength that will comprise CATV and satellite broadcast signal sends to EPON, this single optical wavelength is amplified by image intensifer 405 and by this 1*N decomposer 406, an input port is split into N output port.
The optical wavelength that is used for broadcasting of this separation (is uploaded: 1310nm at the upload/download data wavelength of the EPON of OLT data transmitter 409 medium access controls (MACS) 408 by this WDM coupler 407 and use, download: 1490nm) multiplexed, and send to this EPON.
According to the current broadcast characteristic, this CATV broadcasting is used different frequency bands with satellite broadcasting.That is, the frequency band of 50-87OMHz is used in CATV broadcasting, and the frequency band of 950-2050MHz is used in satellite broadcasting.This CATV and satellite electrical-optical transmitter 404 these two frequency bands of merging and a conversion of signals of merging frequency band are to single optical wavelength.
System configuration in view of the above, do not use two other optical wavelength of branch CATV broadcasting and satellite broadcasting side by side to be sent to the user to adapt to this CATV broadcasting and this satellite broadcasting owing to use single optical wavelength, so the system of wavelength compares with using respectively, can reduce because the extra expenses of using image intensifer and WDM coupler to cause.
This OLT data transmitter 409 is coupling functional blocks based on the IP data, carry out the L2/L3 translation function identical, and carry out and the identical EPON MAC host function of commercial EPON system that provides based on the business of IP/ Ethernet with the legacy system that is used for Internet service.Therefore; this OLT data transmitter 409 uses with the identical data processing method in common internet and handles internet data; and can use the identical frequency band of light signal that uses with conventional method (for example to upload: 1310nm, download: 1490nm).
According to one embodiment of the invention, a kind of device that is used for electricity/optical transmitter and receiver, it receives a satellite broadcast signal and a CATV broadcast singal, make up this two broadcast singals, and the broadcast singal of this combination is offered the user through a smooth user network, this device comprises: an electrical-optical transmitter, receiving satellite broadcast signal and CATV broadcast singal, these two broadcast singals are combined into the single band signal, according to this light user network this single band conversion of signals is become to have a light signal of predetermined wavelength, and send this light signal through this light user network; With a light-electric receiver, the light signal that reception sends from this electrical-optical transmitter, this light signal is converted to a RF broadcast singal, the RF broadcast singal that utilizes the difference between the frequency band of this satellite broadcast signal and this CATV broadcast singal to change is divided into satellite broadcast signal and CATV broadcast singal, and this satellite broadcast signal that separates and CATV broadcast singal are offered the user.Now will describe this electrical-optical transmitter and this light-electric receiver in detail.
Fig. 5 is the block diagram of electrical-optical transmitter 501 according to an embodiment of the invention.
A major function that receives and handle this electrical-optical transmitter 501 of CATV RF broadcast singal 502 and satellite RF broadcast singal 506 is to be received in this CATV RF broadcast singal 502 in the 50-87OMHz frequency band and the satellite RF broadcast singal 506 in the 950-205OMHz frequency band, the signal in the frequency band of the synthetic 50-205OMHz of these two RF sets of signals, the conversion of signals of combination is become single optical wavelength, and this single optical wavelength is sent to a network.
A DC composition that is included in the CATV RF broadcast singal (50-870MHz) 502 that coaxial cable receives is eliminated by a DC bias unit 503, and this this CATV RF broadcast singal 502 that has been eliminated the DC composition is amplified to a prearranged signal level by a RF amplifier, so that this CATV RF broadcast singal 502 is sent to a FTTH or FTTC network.Control these amplifying signals so that keep a prearranged signal level by a RF signal level controller 505.
Among Fig. 5, this RF amplifier 504 and RF signal level controller 505 are constituted respectively.But if requirement, this RF amplifier 504 can be the part of RF signal level controller 505 and an input signal is amplified to a prearranged signal level.And the position of this RF amplifier 504 and RF signal level controller 505 can be exchanged.
A LNB of antenna via satellite, this satellite RF broadcast singal (950-205OMHz) 506 is received low noise assembly transducer (LNB) module 507.This LNB module 507 realizes the operation of the LNB of this satellite antenna by the LNB that one+12V power supply is provided to satellite antenna.
A DC composition that is included in the satellite RF broadcast singal 506 that this LNB module 507 receives is eliminated by a DC bias unit 508, and be amplified to a prearranged signal level from its this satellite RF broadcast singal 506 of having eliminated the DC composition by a RF amplifier 509, so that this satellite RF broadcast singal 506 is sent to this FTTH or FTTC network.Control these amplifying signals so that keep a prearranged signal level by a RF signal level controller 510.As the correlation between RF amplifier 504 that is used for this CATV RF broadcast singal 502 and RF signal level controller 505, for satellite RF broadcast singal 506, the position of RF amplifier 509 and RF signal level controller 510 can be exchanged, and this RF amplifier 509 can be the part of this RF signal level controller 510.
This CATV RF broadcast singal 502 by above-mentioned process respectively and this satellite RF broadcast singal 506 are combined into single RF signal in the frequency band (50-205OMHz) by a RF combiner 511.The single RF signal that is combined in the frequency band can be handled by RF signal level controller 512 selectively again.
This single RF signal and this electrical-optical transmitter 501 impedance matchings, and send to an electrical to optical converter 514 by an impedance matching unit 513.Wherein, the impedance matching between this single RF signal and this electrical-optical transmitter 501 can be the impedance matching between single RF signal and this electrical to optical converter 514.Because forming the electronics and the electric component of the parts of this electrical-optical transmitter 501 is installed on the printed circuit board (PCB) (PCB), and be connected to each other and do not have separation along the circuit-line of this PCB, so the impedance matching between this single RF signal and this electrical-optical transmitter 501 means the part at the parts of this single RF signal and pie graph 5, for example impedance matching between electrical to optical converter 514 or the entire portion.Specifically, the execution of impedance matching comprises the transmission cable that is connected to this electrical to optical converter 514.
Can be calculated in advance owing to be input to the characteristic of a CATV broadcast singal of this electrical-optical transmitter 501, so the impedance of this CATV broadcast singal can be calculated in advance.Therefore, can determine a configuration at needed this impedance matching unit 513 of impedance matching.Therefore, might in the power loss that minimizes a signal by impedance matching, come transmission signals.
According to a FTTH or FTTC network, this electrical to optical converter 514 is converted to the signal of a predetermined wavelength to an input rf signal, and through a smooth user network this wavelength is sent to the user.The state of these electrical to optical converter 514 of one optical signal gain controller 515 response and control the luminous power of this electrical to optical converter 514 is so that the luminous power of this electrical to optical converter 514 of constant maintenance.
In the structure of Fig. 5, if the level of input broadcast singal is stabilized within the preset range, then can not use this RF signal level controller 512, and those skilled in the art will appreciate that, this RF signal level controller 512 can be placed on other position except the position of Fig. 5, even for example use this RF signal level controller 512, it can be placed on after the impedance matching unit 513 or other position.
Equally, this DC bias unit 503 and 508 and impedance matching unit 513 can maybe can be used in the another location, and if necessary, this optical signal gain controller 515 can not use yet.
Fig. 6 is the block diagram of light-electric receiver 601 according to an embodiment of the invention.
This light-electric receiver 601 can be included among the ONU or ONT of a user side, or be placed in the user side separately.
One electro-optic detector 602 is a light wavelength conversion of the multicasting that comprises CATV broadcasting and satellite broadcasting of FTTH by for example EPON and so on or the input of FTTC type network the one RF signal of telecommunication, and the RF signal of telecommunication that sends this conversion is to an impedance matching unit 603.
Impedance between these impedance matching unit 603 these RF signals of telecommunication of coupling and this light-electric receiver 601.Description to this impedance matching unit is identical with the description of the impedance matching unit 512 of Fig. 5.
The RF signal of telecommunication of this impedance matching is amplified to a prearranged signals level by a RF amplifier 604, and sends to a RF distributor 605.
Wherein, this impedance matching and this RF amplify and can realize selectively.This impedance matching is preferably carried out after a light signal is converted into a RF signal of telecommunication.
This RF distributor 605 comprises a low pass filter 608 of a CATV RF broadcast singal that only passes through this input rf signal and only passes through a high pass filter 612 of a satellite RF broadcast singal of this input rf signal, and this input rf signal is divided into two RF broadcast singals.Among Fig. 6, this RF distributor 605 and two filters are illustrated respectively so that help understand, and this configured separate is possible.And the realization of this RF distributor 605 can comprise this low pass filter 608 and this high pass filter 612.Now will describe an example, wherein this low pass filter 608 and this high pass filter 612 are realized outside this RF distributor 605 respectively.
The RF signal of telecommunication that is distributed by this RF distributor 605 is imported into a CATV broadcasting processing unit 606 and a satellite broadcasting processing unit 607.
When this RF signal of telecommunication that is input to this CATV broadcasting processing unit 606 is low pass filtering device 608 filtering, because what pass through is a low frequency signal that is lower than 87OMHz, so only this CATV RF broadcast singal in a RF frequency band (50-87OMHz) is sent to a RF signal level controller 609.
The CATV RF broadcast singal of these RF signal level controller 609 these inputs of control is so that a RF signal level that keeps a RF signal level of being scheduled to or be scheduled to by operator.The CATV RF broadcast singal of this level control can be amplified by an additional RF amplifier 610.
A DC composition of this CATV RF broadcast singal by said process is eliminated by a DC bias unit 611, and this CATV RF broadcast singal of having eliminated the DC composition is sent to a user TV or CATV STB through the medium of for example coaxial cable and so on.Send to this user from this CATV RF broadcast singal of these DC bias unit 611 outputs by a dispensing device (not shown).
When this RF signal of telecommunication that is input to this CATV satellite broadcasting processing unit 607 during by high pass filter 612 filtering, because what pass through is a high-frequency signal that is higher than 90OMHz, so only this satellite RF broadcast singal in a RF frequency band (950-205OMHz) is sent to a RF signal level controller 613.
The satellite RF broadcast singal of these RF signal level controller 613 these inputs of control is so that a RF signal level that keeps a RF signal level of being scheduled to or be scheduled to by operator.The CATV RF broadcast singal of this level control can be amplified by an additional RF amplifier 614.
Identical with the situation of Fig. 5, this RF signal level controlled function and this RF enlarging function can be carried out as required selectively.
A DC composition of this satellite RF broadcast singal by said process is eliminated by a DC bias unit 615, and this satellite RF broadcast singal of having eliminated the DC composition is sent to a user TV or satellite STB through the medium of for example coaxial cable and so on.Send to this user from this satellite RF broadcast singal of these DC bias unit 615 outputs by a dispensing device (not shown).
This FTTH or FTTC network are illustrated the example as above-mentioned smooth user network.Even but it will be appreciated by the skilled addressee that the light user network that uses other type, the spirit and scope of the present invention can be used in the same old way.
And, it will be appreciated by the skilled addressee that each step of the present invention can use a kind of common programmed method diversely to be realized by software or hardware.
As mentioned above, according to the embodiment of the invention, receive a satellite broadcast signal and a CATV broadcast singal and can side by side be provided to this user to the device that the broadcast singal of this reception offers the user to this satellite broadcasting and this CATV broadcasting by a smooth user network, this device comprises an electrical-optical transmitter, receiving satellite broadcast signal and CATV broadcast singal, these two broadcast singals are combined into the single band signal, according to this light user network this single band conversion of signals is become to have a light signal of predetermined wavelength, and send this light signal through this light user network; An and light-electric receiver, the light signal that reception sends from this electrical-optical transmitter, this light signal is converted to a RF broadcast singal, the RF broadcast singal that the difference of utilization between the frequency band of this satellite broadcast signal and this CATV broadcast singal will be changed is divided into satellite broadcast signal and CATV broadcast singal, and this satellite broadcast signal that separates and CATV broadcast singal are offered the user.These features are not included in the traditional broadcasting service and have a plurality of advantages.
At first, because the CATV broadcast singal uses different frequency bands with satellite broadcast signal, so multiplexed easy realization, and because the easy multiplexing technique of using according to digital broadcasting, so realization of the present invention is than simple by broadcasting set broadcasting and method for communicating in the band.
Second, because CATV broadcasting and satellite broadcasting are multiplexed in the RF frequency band and use the light signal of single wavelength to send, so it is a lot of that transmission WDM coupler that is divided and the wavelength number that receives the WDM coupler can reduce than the method for common FTTH that is applied to PON and so on for example or FTTC, and the number that need come to send respectively the image intensifer of this CATV broadcasting and this satellite broadcasting can be lowered.Therefore, being used for configuration set broadcasts more cheap with the expense of a network of communicating by letter.
The 3rd, because only the satellite broadcasting that sends via satellite can be a kind of light user network transmission of the Internet by belonging to, so constitute single network by broadcasting with the set of communicating by letter easily.That is, the Internet, CATV broadcasting and satellite broadcasting can side by side be served through single fiber optic cable.
The 4th, because each user must not install a system (antenna) that is used for receiving satellite broadcast, so can reduce to be used for the Master Cost of broadcasting-satellite service, and, can from a receiver structure, delete so drive the required functional part of this antenna owing to do not need antenna.Therefore, can realize a receiver more simply.
The 5th, because the sat LNB module is included in the transmitter architecture,, simplified this transmitter architecture so do not need to be used to drive the power supply of exterior antenna.Correspondingly, owing to system configuration can change neatly along with reducing price, so this system configuration is economical.
Though show particularly and described the present invention, it will be apparent to one skilled in the art that the change that under the condition of the spirit and scope of the present invention that do not deviate from appended claim definition, can do on various forms and the details with reference to preferred embodiment.Preferred embodiment should only consider to be used for the purpose of describing significance rather than restriction.Therefore, scope of the present invention is not to describe institute by detailed description of the present invention to limit but limited by appending claims, and the whole differences in this scope all are interpreted as comprising in the present invention.
Claims (13)
1. device that is used for electricity/optical transmitter and receiver, it receives a satellite broadcast signal and a CATV broadcast singal, makes up this two broadcast singals, and the broadcast singal of this combination is offered the user through a smooth user network, and this device comprises:
One electrical-optical transmitter, receiving satellite broadcast signal and CATV broadcast singal, these two broadcast singals are combined into a single band signal, this single band conversion of signals is become to have a light signal of predetermined wavelength according to this light user network, and send this light signal through this light user network, described electrical-optical transmitter comprises:
One LNB module is received in the satellite broadcast signal in the predetermined frequency band,
One RF combiner, this satellite broadcast signal that receives by this LNB module and this CATV broadcast singal be combined into a frequency band and
One electrical to optical converter, the RF conversion of signals that will make up according to this light user network become a light signal with a wavelength, and by this light user network this light signal are transmitted into this light-electric receiver; And
One light-electric receiver, the light signal that reception sends from this electrical-optical transmitter, this light signal is converted to a RF broadcast singal, the RF broadcast singal that the difference of utilization between the frequency band of this satellite broadcast signal and this CATV broadcast singal will be changed is divided into satellite broadcast signal and CATV broadcast singal, and the satellite broadcast signal of this division and CATV broadcast singal are offered the user, and described light-electric receiver comprises:
One electro-optic detector converts an optical wavelength signal that sends by this light user network to a RF signal; With
One RF distributor, utilize the difference between the frequency band of this satellite broadcast signal and this CATV broadcast singal that this RF division of signal of being changed by this electro-optic detector is become this satellite broadcast signal and this CATV broadcast singal, and the satellite broadcast signal of this division and CATV broadcast singal are offered the associated user.
2. device as claimed in claim 1, wherein this electrical-optical transmitter also comprises:
One RF signal level controller, the RF signal of this satellite broadcast signal that will be received by this LNB module and this CATV broadcast singal of reception remains on a predetermined level.
3. device as claimed in claim 2, wherein this RF signal level controller comprises:
One RF amplifier is amplified to a prearranged signal level to this satellite broadcast signal or this CATV broadcast singal.
4. device as claimed in claim 1, wherein this electrical-optical transmitter also comprises:
One RF signal level controller is remaining on a predetermined level by this RF signal in the single band of this RF combiner combination.
5. device as claimed in claim 1, wherein this electrical-optical transmitter also comprises:
One DC bias unit, deletion can be included in from the DC composition in the RF broadcast singal of the CATV broadcast singal of this satellite broadcast signal and this reception.
6. device as claimed in claim 1, wherein this electrical-optical transmitter also comprises:
One impedance matching unit is this RF broadcast singal and this electrical-optical transmitter coupling by this RF combiner combination.
7. device as claimed in claim 1, wherein this electrical-optical transmitter also comprises:
One optical signal gain controller is controlled the power of this electrical to optical converter, so as according to this light user network with this power invariability remain on a predetermined level.
8. device as claimed in claim 1, wherein this light-electric receiver also comprises:
One impedance matching unit is this RF signal of being changed by this electro-optic detector and this light-electric receiver coupling.
9. device as claimed in claim 1, wherein this light-electric receiver also comprises:
One RF amplifier is amplified to the RF signal of this conversion one level of being scheduled to and the RF signal of this amplification is sent to this RF distributor.
10. device as claimed in claim 1, wherein this RF distributor comprises:
One low frequency bandpass filter is only by this CATV broadcast singal from this input rf signal; With
One high freguency bandpass filter is only by this satellite broadcast signal from this input rf signal.
11. device as claimed in claim 1, wherein this light-electric receiver also comprises:
One RF signal level controller remains on a predetermined level with the RF signal of this satellite broadcast signal and this CATV broadcast singal.
12. as the device of claim 11, wherein this RF signal level controller comprises:
One RF amplifier is amplified to a prearranged signal level to this satellite broadcast signal or this CATV broadcast singal.
13. device as claimed in claim 1, wherein this light-electric receiver also comprises:
One DC bias unit, deletion can be included in the DC composition from the RF broadcast singal of this satellite broadcast signal of this RF distributor output and this CATV broadcast singal.
Applications Claiming Priority (6)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR20040009024 | 2004-02-11 | ||
| KR9024/04 | 2004-02-11 | ||
| KR9024/2004 | 2004-02-11 | ||
| KR1020040038718A KR100687708B1 (en) | 2004-02-11 | 2004-05-29 | Apparatus for electric/optic transmitter and receiver providing the combined broadcasting signal through optical subscriber network |
| KR38718/2004 | 2004-05-29 | ||
| KR38718/04 | 2004-05-29 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1655614A CN1655614A (en) | 2005-08-17 |
| CN100355285C true CN100355285C (en) | 2007-12-12 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2004100869738A Expired - Fee Related CN100355285C (en) | 2004-02-11 | 2004-10-20 | Device for elctro/optical emitter and receiver providing combined broadcast signal via user network |
Country Status (2)
| Country | Link |
|---|---|
| JP (1) | JP2005229572A (en) |
| CN (1) | CN100355285C (en) |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2067289B1 (en) * | 2006-09-22 | 2016-09-07 | Alvarion Ltd. | Wireless over pon |
| CN100452873C (en) * | 2006-12-29 | 2009-01-14 | 蒋金甫 | Rural broadcasting TV system based on FM optical termining machine and implementing method |
| US7965939B2 (en) * | 2007-06-15 | 2011-06-21 | Northpeak Enterprises, Inc. | Passive optical network system for the delivery of bi-directional RF services |
| KR100887156B1 (en) * | 2007-10-25 | 2009-03-04 | 호서대학교 산학협력단 | Distortion and noise cancellation system for an hybrid fiber-coax network |
| JP5346675B2 (en) * | 2009-05-07 | 2013-11-20 | シンクレイヤ株式会社 | FTTH CATV system |
| CN108696711A (en) * | 2017-04-10 | 2018-10-23 | 珠海全志科技股份有限公司 | Master-slave mode Video transmission system with mongline two-way communication function |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20020063924A1 (en) * | 2000-03-02 | 2002-05-30 | Kimbrough Mahlon D. | Fiber to the home (FTTH) multimedia access system with reflection PON |
| US20030076560A1 (en) * | 2001-07-20 | 2003-04-24 | Pratt Michael K. | Single fiber passive optical network wavelength division multiplex overlay |
| WO2004002001A2 (en) * | 2002-06-21 | 2003-12-31 | Pulse-Link, Inc. | Ultra-wideband communication through a wire medium |
-
2004
- 2004-10-20 CN CNB2004100869738A patent/CN100355285C/en not_active Expired - Fee Related
- 2004-10-28 JP JP2004314532A patent/JP2005229572A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20020063924A1 (en) * | 2000-03-02 | 2002-05-30 | Kimbrough Mahlon D. | Fiber to the home (FTTH) multimedia access system with reflection PON |
| US20030076560A1 (en) * | 2001-07-20 | 2003-04-24 | Pratt Michael K. | Single fiber passive optical network wavelength division multiplex overlay |
| WO2004002001A2 (en) * | 2002-06-21 | 2003-12-31 | Pulse-Link, Inc. | Ultra-wideband communication through a wire medium |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2005229572A (en) | 2005-08-25 |
| CN1655614A (en) | 2005-08-17 |
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