CN201491166U - Radio frequency network on optical fiber - Google Patents
Radio frequency network on optical fiber Download PDFInfo
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- CN201491166U CN201491166U CN2009201907966U CN200920190796U CN201491166U CN 201491166 U CN201491166 U CN 201491166U CN 2009201907966 U CN2009201907966 U CN 2009201907966U CN 200920190796 U CN200920190796 U CN 200920190796U CN 201491166 U CN201491166 U CN 201491166U
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Abstract
The utility model relates to a radio frequency network on an optical fiber and belongs to the transmission technical field of wired networks. The radio frequency network comprises a down optical transmitter, an upper optical receiver, an optical splitter, a wavelength division multiplexer and a plurality of transceivers, wherein the down optical transmitter is used for modulating a to-be-transmitted down radio frequency signal into an optical signal; the upper optical receiver is used for demodulating the optical signal into an upper radio frequency signal; the optical splitter is used for averagely distributing the energies of optical signals with identical wavelengths to a plurality of output ports; one end of the wavelength division multiplexer is connected with the down optical transmitter and the upper optical receiver to compound a down optical signal and an upper optical signal, and the other end of the wavelength division multiplexer is connected with the optical splitter; each transceiver is connected with one output port of the optical splitter to receive the optical signal and demodulate the optical signal into the down upper radio frequency signal for transmission and simultaneously modulate the upper radio frequency signal into the optical signal for transmission. The utility model can remarkably improve the problem of noise return, save a large amount of optical fiber and upper optical receiver resources, reduce the maintenance workload and save the cable network improvement cost by adopting the bidirectional cable TV network new improvement technology.
Description
Technical field
The utility model belongs to the cable network transmission technique field, especially relates to two-wayization cable television network system.
Background technology
The main cable television operators in the whole world quicken to stride forward towards the fiberize step, the radio frequency network on the optical fiber) or the various PON that arrange in pairs or groups (PON: passive all optical network by RFoG (RFoG:, be a kind of broadband access technology that adopts point-to-multipoint network structure, passive fiber transmission means, multiple integrated service is provided based on Fast Ethernet platform and time-division media interviews control mode) technology, reach the frequency range upgrading, save benefit such as operation cost.
The RFOG standard can continue to keep existing headend equipment, top box of digital machine, Docsis wire line MODEM and emerging multimedia terminal adapter products such as (E-MTA), and the user only need install an optical-electrical converter just can view and admire high definition and other programs.RFOG can allow operator build the FTTP network in newly-built sub-district and commercial and residential building, also can provide upgrade service for original HFC user.
At present; the HFC two-way cable TV network network (HFC: Hybrid Fiber Coaxial of widespread usage; often refer to utilize Hybrid Fiber Coax to carry out the cable TV network of wideband digital communication); because there are shortcomings such as big, the active transmission equipment of passback influx noise is many, maintenance workload is big in it, scale successful Application at home seldom.In addition, the passback optical transmission chain in the HFC bilateral network is unfavorable for that with the characteristic that point-to-point mode realizes two-way cable TV network network light advances the development that copper moves back.
Summary of the invention
For solving defectives such as big, the active transmission equipment of prior art cable television network system passback influx noise is many, maintenance workload is big, the purpose of this utility model is to provide a kind of radio frequency network, because whole Network Transmission is all finished with optical fiber link, be referred to as the radio frequency network on the optical fiber, be called for short the RFoG network.
The technical scheme that its technical problem that solves the utility model adopts:
Radio frequency network on a kind of optical fiber is characterized in that comprising:
Descending optical sender, the downlink radio-frequency signal that is used for transmitting is modulated to light signal;
Up optical receiver is used for light signal is demodulated to up radiofrequency signal;
Optical branching device is used for energy mean allocation with the light signal of same wavelength to a plurality of output ports;
Wavelength division multiplexer is used for composite downstream light signal and uplink optical signal,
A plurality of transceivers in order to receive the light signal that descending optical sender sends, are demodulated to downlink radio-frequency signal and transmission, simultaneously up radiofrequency signal are modulated into the light signal emission
One end of wavelength division multiplexer is connected with up optical receiver with descending optical sender, and its other end is connected with described optical branching device; Each transceiver links to each other with an output port of described optical branching device.
Further, the operation wavelength of described descending optical sender is 1550nm.
Described up optical receiver is ultralow luminous power receiver, luminous power range of receiving-13dBm～-27dBm.
Transceiver is made up of second wavelength division multiplexer, descending optical receiver, up optical sender,
Described wavelength division multiplexer is given descending optical receiver in order to solve the 1550nm light signal, is demodulated to downlink radio-frequency signal and sends on the coaxial cable;
Described up optical sender in order to up radiofrequency signal is modulated into the light signal of 1310nm or 1590nm, is synthesized to upwards transmission in the optical fiber by second wavelength division multiplexer;
Second wavelength division multiplexer is connected with up optical sender with descending optical receiver.
Up optical sender in the above-mentioned transceiver is the transmitter of burst mode work, and the emission light signal did not have light signal during no radio-frequency transmission signals and sends when radio-frequency transmission signals was arranged.The characteristics of this burst mode work are the prerequisites that uplink optical signal is able to the multichannel mixed transport.
The quantity of described transceiver is 2～32.
The beneficial effects of the utility model mainly show:
1, the radio frequency network on the utility model optical fiber is equally applicable to descending optical sender, optical branching device and the fiber optic network of the existing two-way net of HFC, can satisfy wired operator and in Full Fibre Network architecture evolution process seamless evolution and reduction operation be paid joint demand.
2, maintenance workload still less, the long-distance transmissions of RFoG network partly is passive all optical network, does not use active equipment such as optical workstation, amplifier etc.This means that outdoor test maintaining work has not just had substantially, need not electric power system in the RFoG transmission network, equipment is simple.
3, the noise of the noise ratio hfc plant of RFoG network is little.The burst transfer pattern of return path is the key of the excellent noise performance of RFoG network.When ustomer premises access equipment is worked, have only a laser works in the RFoG transceiver in the RFoG network, transmit return path signal, influx noise significantly reduces like this.Idle transceiver has shielded influx noise.
4, the up optical link of RFoG network adopts the mode of point-to-multipoint, mates fully with the point-to-multipoint mode of descending optical link, and the network architecture is simple more, reasonable.Meet light and advance the network development requirement that copper moves back.
5, RFoG network support other technologies.If the descending use of RFoG network 1550nm wavelength, up use 1590nm, the PON system can shared RFoG network, and (the PON system uses 1310nm﹠amp; The 1490nm wavelength can wavelength division multiplexing transmits to same optical fiber), thus the bandwidth and the redundant Ethernet capacity of the Gbit order of magnitude obtained, so that further business service to be provided.
Description of drawings
Fig. 1 is a structural representation of the present utility model.
Embodiment
Below in conjunction with accompanying drawing the utility model is further described.
With reference to Fig. 1, the radio frequency network on a kind of optical fiber comprises descending optical sender 1, up optical receiver 2, wavelength division multiplexer 3, optical branching device 4 and several RFoG transceivers 5.
Descending optical sender 1, the downlink radio-frequency signal that is used for transmitting is modulated to light signal, and the operation wavelength of described descending optical sender is 1550nm.
Up optical receiver 2 is demodulated to up radiofrequency signal with light signal.Receiver wavelength range: 1290～1610nm, reference optical power :-13dBm～-27dBm.
The radio frequency network course of work on the utility model optical fiber is described below:
Descender: downlink radio-frequency signal converts the 1550nm light signal to by descending optical sender, through wavelength division multiplexer (behind the multiplexing up 1310nm light signal of wavelength division multiplexer, realize carrying out long-distance transmissions with an optical fiber) be transferred to optical branching device near user side, optical branching device is divided into 32 road light signals with 1 road downlink optical signal, insert 32 RFoG transceivers then respectively, the RFoG transceiver carries out the wavelength-division demultiplexing earlier, isolate downlink optical signal, convert light signal to radiofrequency signal then and pass to user side.
Ascender: import the RFoG transceiver from the radiofrequency signal that user side is uploaded, the RFoG transceiver carries out the electric light conversion earlier, produce the light signal of 1310nm, then with descending 1550nm light signal wavelength division multiplexing, in an optical fiber, transmit, 32 road uplink optical signals of 32 RFoG transceiver outputs blend together 1 road light signal and pass back to sub-headend at a distance behind optical branching device, isolate the 1310nm light signal and import up optical receiver behind the sub-headend demultiplexing, up optical receiver realizes that opto-electronic conversion demodulates up radiofrequency signal.
In descending optical sender, optical branching device and optical fiber in the radio frequency network on the utility model optical fiber and the prior art in the HFC bilateral network equipment the same.Therefore need not to change these equipment and optical fiber the upgrading from the HFC bilateral network to the RFoG network, realize seamless evolution, reduce the upgrading cost.
Distance can reach 20km to radio frequency network on the utility model optical fiber from sub-headend to the user side Optical Fiber Transmission.Only use a passive optical splitter in the remote fiber transmission link, need not active equipment, network is simple, reliable, has significantly reduced maintenance workload.
RFoG transceiver in the radio frequency network on the utility model optical fiber, up smooth radiating portion adopts burst mode work, 32 RFoG transceivers have only 1 what synchronization produced light signal, that is to say and have only 1 family user's noise to pass back to sub-headend, all the other 31 family users' noise conductively-closed has significantly reduced the noise of upward signal.If use HFC bilateral network framework, the noise that then passes back to sub-headend is 32 family users' a influx noise.
Radio frequency network on the utility model optical fiber, up optical link is realized the mode of point-to-multipoint by optical branching device, make 32 tunnel passback light signals of 32 RFoG transceivers blend together 1 tunnel transmission, insert 1 optical fiber at sub-headend and use 1 passback optical receiver just can realize Network Transmission.If use HFC bilateral network pattern, then need insert 32 optical fiber and use 32 passback optical receivers to realize at sub-headend.
Radio frequency network on the utility model optical fiber has the network architecture feature of 1: 32 point-to-multipoint, and particularly the EPON network is consistent with the PON network for this.The up optical wavelength of RFoG network is changed into 1590nm, just can realize that two nets of RFoG network and EPON network merge.The RFoG network uses 1550nm and 1590nm wavelength, and the EPON network uses 1310nm and 1490nm wavelength, and the mode by wavelength division multiplexing is implemented in same the optical networking to be transmitted.
Claims (6)
1. the radio frequency network on the optical fiber is characterized in that comprising:
Descending optical sender, the downlink radio-frequency signal that is used for transmitting is modulated to light signal;
Up optical receiver is used for light signal is demodulated to up radiofrequency signal;
Optical branching device is used for energy mean allocation with the light signal of same wavelength to a plurality of output ports;
Wavelength division multiplexer is used for composite downstream light signal and uplink optical signal,
A plurality of transceivers in order to receive the light signal that descending optical sender sends, are demodulated to downlink radio-frequency signal and transmission, simultaneously up radiofrequency signal are modulated into the light signal emission,
One end of wavelength division multiplexer is connected with up optical receiver with descending optical sender, and its other end is connected with described optical branching device; Each transceiver links to each other with an output port of described optical branching device.
2. the radio frequency network on the optical fiber according to claim 1 is characterized in that: the operation wavelength of described descending optical sender is 1550nm.
3. the radio frequency network on the optical fiber according to claim 1 is characterized in that: described up optical receiver is ultralow luminous power receiver, luminous power range of receiving-13dBm～-27dBm.
4. the radio frequency network on the optical fiber according to claim 1 is characterized in that: transceiver is made up of second wavelength division multiplexer, descending optical receiver, up optical sender,
Described wavelength division multiplexer is given descending optical receiver in order to solve the 1550nm light signal, is demodulated to downlink radio-frequency signal and sends on the coaxial cable;
Described up optical sender in order to up radiofrequency signal is modulated into the light signal of 1310nm or 1590nm, is synthesized to upwards transmission in the optical fiber by second wavelength division multiplexer;
Second wavelength division multiplexer is connected with up optical sender with descending optical receiver.
5. the radio frequency network on the optical fiber according to claim 4 is characterized in that: the up optical sender in the described transceiver is the up optical sender of burst mode work.
6. the radio frequency network on the optical fiber according to claim 1 is characterized in that: the quantity of described transceiver is 2～32.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009201907966U CN201491166U (en) | 2009-08-06 | 2009-08-06 | Radio frequency network on optical fiber |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009201907966U CN201491166U (en) | 2009-08-06 | 2009-08-06 | Radio frequency network on optical fiber |
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| CN201491166U true CN201491166U (en) | 2010-05-26 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2009201907966U Expired - Fee Related CN201491166U (en) | 2009-08-06 | 2009-08-06 | Radio frequency network on optical fiber |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102137406A (en) * | 2010-10-29 | 2011-07-27 | 北京汉铭通信有限公司 | Main device for wireless communication multi-network integration, expansion device and remote device |
| CN103457666A (en) * | 2012-05-29 | 2013-12-18 | 鸿富锦精密工业（深圳）有限公司 | Bidirectional dual-frequency light transmission module and transmission component thereof |
| CN113785537A (en) * | 2019-02-27 | 2021-12-10 | 迈凌亚洲新加坡私人有限公司 | Copper return for hybrid fiber coaxial network |
-
2009
- 2009-08-06 CN CN2009201907966U patent/CN201491166U/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102137406A (en) * | 2010-10-29 | 2011-07-27 | 北京汉铭通信有限公司 | Main device for wireless communication multi-network integration, expansion device and remote device |
| CN102137406B (en) * | 2010-10-29 | 2013-09-18 | 北京汉铭通信有限公司 | Main device for wireless communication multi-network integration, expansion device and remote device |
| CN103457666A (en) * | 2012-05-29 | 2013-12-18 | 鸿富锦精密工业（深圳）有限公司 | Bidirectional dual-frequency light transmission module and transmission component thereof |
| CN113785537A (en) * | 2019-02-27 | 2021-12-10 | 迈凌亚洲新加坡私人有限公司 | Copper return for hybrid fiber coaxial network |
| CN113785537B (en) * | 2019-02-27 | 2023-04-04 | 迈凌亚洲新加坡私人有限公司 | Copper backhaul for hybrid fiber coaxial networks |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20100526 Termination date: 20180806 |
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| CF01 | Termination of patent right due to non-payment of annual fee |