CN100433834C - Multi-point video transmitting system with single optical fiber - Google Patents
Multi-point video transmitting system with single optical fiber Download PDFInfo
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- CN100433834C CN100433834C CNB2006100130087A CN200610013008A CN100433834C CN 100433834 C CN100433834 C CN 100433834C CN B2006100130087 A CNB2006100130087 A CN B2006100130087A CN 200610013008 A CN200610013008 A CN 200610013008A CN 100433834 C CN100433834 C CN 100433834C
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Abstract
The present invention relates to the technical field of optical fiber transmission and the video monitoring field, particularly to a single-fiber multi-point video transmission system. For realizing long-distance, wide-range and real-time monitoring, solving the problem of bandwidth resources, and enhancing the availability ratio of optical fiber passages, and meanwhile for solving the problem that the number of access nodes is limited and overcoming the disadvantage of inflexible access modes, the present invention takes the technical proposals that video signals collected by a camera are converted into optical signals by a video sending module for transmitting; the optical signals and video signals in nodes asynchronously accessed on the way are divided in frequency and multiplexed by the video sending module in the transmission process; an OADM is used for unloading and processing signals; then the signals are loaded to divide wave and multiplex (WDM). The present invention is mainly used for distributed video monitoring.
Description
Technical field
The present invention relates to optical fiber transmission technique field and field of video monitoring, specifically relate to multi-point video transmitting system with single optical fiber.
Background technology
The application of video monitoring is divided into two big classes in general: the one, and centralized monitor, being characterized in that the control point is distributed in the small range or from certain scope can regard the circuit of point-to-point as (such as long-range unmanned guard machine room, the control point is distributed in the less machine room, Surveillance center and unmanned machine room just can be regarded point-to-point as), this moment is just passable with the transmission technology of point-to-point.Present product is used this field that mainly concentrates on, and it is also relatively good that relevant technical problem solves, and market is ripe relatively.Traditional analog video supervisory control system can be adopted, also digital video technology (compression or incompressible) can be adopted.
It is distributed video monitoring that other one big class of video monitoring is used.The control point is dispersed in the very big scope (as the monitoring on highway, railway, long distance line, border etc.), is example with the highway, if every kilometer is provided with 1 control point, just needs 100 control points on 100 kilometers the highway.Because traditional analog video transmission technology can't be networked, and can only adopt point-to-point mode on-site supervision for each control point, causes the wiring installation amount very big, basically can not practical application.Incompressible digital video technology needs very high system bandwidth and the whole network synchronous under the more situation of access point, causes each node very complicated, and cost is too high, substantially also is difficult to practical application.Have only the transmission technology that adopts the digital video signal that compresses to constitute computer network in conjunction with TCP/IP similarly in the distributed video monitoring system application being arranged at present, but because each node all must have processes such as compression, protocol conversion, each node is still too complicated, cost height (present estimation, each node is about 100,000 RMB); System's speed is subjected to the restriction of computing capability (mainly being protocol processes) and is difficult to improve, and has limited the popularization of this application greatly.In addition, what computer network adopted is that bandwidth is monopolized scheme, when access node more for a long time, the real-time of image is difficult to guarantee, for a lot of real-time demanding occasions, also can't satisfy system requirements.
In invention " highway communication video monitoring system " (number of patent application is 200420028435), " a kind of highway communication video monitoring system has been proposed; it is characterized in that: have monitor to connect audio switch; have spherical camera to connect decoder; audio switch, decoder and video camera are connected the video/audio switching matrix; the video/audio switching matrix connects video wall, figure control terminal, master keyboard, secondary master keyboard and colored 16 image splitters, colored 16 image splitters connect time lapse imaging recorder.Colored 16 image splitters connect optical transceiver, and optical transceiver connects optical fiber, and optical fiber connects the far-end optical transceiver, and the far-end optical transceiver connects the far-end control appliance.Integrate vehicle detection, road monitoring, weather monitoring, traffic statistics, wireless telecommunications, transfer of data, online enquiries, dispatch control, form comprehensive video monitoring subsystem.Advanced, practical, reliable, safety, maintain secrecy and be convenient to and safeguard." (drawing from this patent of invention summary)
The scheme that video transmission is adopted in the above supervisory control system is that two optical transceiver point-to-points connect, this connected mode is applicable to the video monitoring in the concentrated scope of single-point, and for multiple spot distributed video monitoring on a large scale, adopt the Optical Fiber Transmission mode of point-to-point, then can cause great construction volume and thing followed significant cost.
To sum up, the Optical Fiber Transmission of the point-to-point that adopts in present video Optical Fiber Transmission and the monitoring field, although can accomplish long Distance Transmission monitoring like this, but but exist the shortcoming that can not insert new monitor node flexibly and can't realize large-scale distributed monitoring, and wavelength of transmission in the optical fiber in the point-to-point Optical Fiber Transmission, the wide bandwidth characteristic of optical fiber is not utilized effectively.In addition, in the video transfer scheme that adopts the computer network transmission technology, exist bandwidth resources and be difficult to be guaranteed, the deficiency that the access node number is restricted.
Summary of the invention
For overcoming the deficiencies in the prior art, the objective of the invention is to realize the monitoring in real time on a large scale of long distance, solve the problem of bandwidth resources; Simultaneously, also to solve the access node number and be restricted, overcome the inflexible shortcoming of access way.Realize multiple signals can be on 1 optical fiber real-time Transmission simultaneously, realize the flexible access of large-scale video monitoring and monitor node, solved the limited and the whole network stationary problem of bandwidth resources simultaneously, improve the utilance of optical-fibre channel.
The technical solution used in the present invention is:
A kind of multi-point video transmitting system with single optical fiber, comprise node and with the node camera collection to the receiving node that finally on display, shows of image, described node comprises the camera of gathering vision signal, carry out under the signal road and carry out the optical add/drop multiplexer OADM that wavelength division multiplexing is set out on a journey signal, the vision signal in the node of the output of aforementioned camera and asynchronous access on the way in transmission course is carried out the video transmission module of frequency division multiplexing.
Constituting of described video transmission module: the following road signal that receives described optical add/drop multiplexer output is the photodetector of the signal of telecommunication with this time road conversion of signals also, the amplifying circuit that will amplify from the signal of telecommunication of photodetector, with described camera collection to picture signal carry out the mixer of frequency division multiplexing through the FM visual modulator modulation back and the output of signal amplification circuit, with the output of above-mentioned mixer carry out the direct sunshine intensity modulated and with described time road signal have identical wavelength laser.
Described node is 100, in the node 1～25, FM visual modulator carrier frequency is f1, laser wavelength is respectively λ 1～λ 25 and corresponding one by one with node, in the node 26～50, FM visual modulator carrier frequency is f2, laser wavelength is respectively λ 1～λ 25 and corresponding one by one with node, in the node 51～75, FM visual modulator carrier frequency is f3, laser wavelength is respectively λ 1～λ 25 and corresponding one by one with node, in the node 76～100, FM visual modulator carrier frequency is f4, and laser wavelength is respectively λ 1～λ 25 and corresponding one by one with node, and the road is consistent with the laser wavelength of this intranodal with the wavelength of setting out on a journey under each node.
The present invention possesses following effect: the mode that the present invention combines by frequency division multiplexing and wavelength division multiplexing has realized distributed asynchronous access, final wavelength-division multiplex signals is sent to receiving node, camera collection to image finally on display, show, so not only increased the flexibility that the number that can insert the video monitoring node and node insert greatly, and realize multiple signals can be on 1 optical fiber real-time Transmission simultaneously, improved the optical-fibre channel utilance.
Description of drawings
Figure one: the system topology figure that adopts distributed asynchronous access technology
Figure two: the video transmission module frame chart
Figure three: individual node composition frame chart in the node 1～100
Figure four: scheme implementation example embodiment
Embodiment
Further specify the present invention below in conjunction with drawings and Examples.
Basic functional principle of the present invention: the vision signal by camera collection is that light signal transmits through the video transmission module converts, in transmission course with the node of asynchronous access on the way in vision signal carry out frequency division multiplexing by the video transmission module, (OADM) carries out road under the signal by optical add/drop multiplexer, signal processing, and then set out on a journey by signal and to carry out wavelength division multiplexing (WDM).Thereby realized distributed asynchronous access by the mode that frequency division multiplexing and wavelength division multiplexing combine, final wavelength-division multiplex signals is sent to receiving node, camera collection to image finally on display, show.So not only increase the flexibility that the number that can insert the video monitoring node and node insert greatly, and improved the optical-fibre channel utilance.
The present invention proposes a kind of node apparatus that is applicable to distributed asynchronous access video Optical Fiber Transmission, as figure three.This node apparatus is formed the video transmission module by optical add/drop multiplexer module and video transmission module as figure two.The video transmission module is by the FM visual modulator, photodetector, amplifying circuit, mixer and laser constitution.
When this node apparatus inserted monitor network, a certain specific wavelength signal that optical add/drop multiplexer will need to handle descended the road, is input to photodetector, carried out signal through amplifying circuit then and amplified; On the other hand, the vision signal that arrives of camera collection is through FM visual modulator modulation output video modulation signal; It is one road signal of telecommunication that the amplifying signal of video modulation signal and amplifying circuit output is input to the mixer frequency division multiplexing, this signal of telecommunication is input to the laser input that has identical wavelength with former road signal down and carries out the direct sunshine intensity modulated, the light signal that obtains is through setting out on a journey and carrying out wavelength division multiplexing by other wavelength signals of OADM, and multiplexed signals continues to transmit to next node.
The present invention proposes the distributed asynchronous access scheme that a kind of frequency division multiplexing combines with wavelength division multiplexing, this scheme is specific as follows: form the video fiber optic transmission system by the video transmission device that 100 the present invention propose as node and a receiving node, internodal phase mutual edge distance is 1km, as accompanying drawing one.100 nodes are divided into four groups: in the node 1～25, FM visual modulator carrier frequency is f1, and laser wavelength is respectively λ 1～λ 25, corresponding one by one with each node, that is: the wavelength of laser is λ 1 in the node 1, and the wavelength of the laser in the node 2 is λ 2, and the rest may be inferred; In the node 26～50, FM visual modulator carrier frequency is f2, laser wavelength is respectively λ 1～λ 25 and corresponding one by one with node, that is: the wavelength of node 26 lasers is λ 1, the wavelength of node 27 lasers is λ 2, the rest may be inferred, and the following road of OADM module is consistent with the laser wavelength of this intranodal with the wavelength of setting out on a journey simultaneously; In the node 51～75, FM visual modulator carrier frequency is f3, laser wavelength is respectively λ 1～λ 25 and corresponding one by one with node, that is: the wavelength of node 51 lasers is λ 1, the wavelength of node 52 lasers is λ 2, the rest may be inferred, and the following road of OADM module is consistent with the laser wavelength of this intranodal with the wavelength of setting out on a journey simultaneously; In the node 76～100, FM visual modulator carrier frequency is f4, laser wavelength is respectively λ 1～λ 25 and corresponding one by one with node, that is: the wavelength of node 51 lasers is λ 1, the wavelength of node 52 lasers is λ 2, the rest may be inferred, and the following road of OADM module is consistent with the laser wavelength of this intranodal with the wavelength of setting out on a journey simultaneously.
When the video optical fiber telecommunications system is carried out the signal transmission, the FM visual modulator is modulated to video input signals separately on the carrier wave that frequency is f1 respectively in the node 1～25, then FM signal is outputed to the input of laser separately, (λ 1 with separately optical wavelength for the laser on each node ... λ 25) FM signal is modulated on the light carrier.Pass through the cascade of node then, signal carries out wavelength division multiplexing along the optical add/drop multiplexer of optical fiber by each node to be transmitted to next node; When the light signal that includes 25 different carrier wavelength of node 25 output transmits through node 26～50 downwards, carrier wave is that the light signal of λ 1 is on road under optical add/drop multiplexer, node 26 places, carry out opto-electronic conversion, amplification and carrier frequency are that the FM signal of f2 is carried out frequency division multiplexing, this multiplexed signals be similarly through wavelength λ 1 laser modulate the outgoing carrier wavelength be λ 1 light signal through set out on a journey with optical add/drop multiplexer in the light signal that transmits carry out wavelength division multiplexing, and transmit to next node, in like manner the carrier wavelength of the light signal on road is λ 2 under node 27 places, behind the signal processing identical with node 26, through carrier wavelength is the laser modulation of λ 2, set out on a journey then with optical add/drop multiplexer in light signal carry out wavelength division multiplexing and transmit, other nodes to next node; Signal is similar to node 76～100 o'clock working condition through node 51～75, just in node 51～75, the carrier frequency of amplifying the multiplexing FM signal of output signal with amplifying circuit is f3, and the carrier frequency of amplifying the multiplexing FM signal of output signal with amplifying circuit in 76～100 is f4.The light signal that contains 25 different carrier wavelength in the light signal of node 100 output is loaded with the video FM signal of 4 different carrier frequency on each light signal.This light signal finally is transferred to receiving node, and at the receiving node place, this light signal finally is reduced to raw video signal through the demultiplexing demodulation, and is presented on the monitor.
Shown in figure four, be the present invention program and the concrete example of implementing of emitter.This system is a long-distance highway monitoring system.Adopt V3939APT at the control point camera, the FM visual modulator adopts FMG2220, and photodetector adopts JZPIPP FC/APC, amplifying circuit is made of MAX series amplifier, mixer adopts XXH-204, and laser adopts JZD1XX0, and the OADM module adopts OADM-0200.Adopt distributed asynchronous access technology to connect between each node by optical fiber, the monitoring image that each control point collects finally is transferred to receiving node Control Room place, carry out demultiplexing by demodulation multiplexer, then through multi-channel demodulator machine demodulation output, restore raw video signal, final monitoring image shows that on the Control Room monitor final the realization monitored in real time.
What system adopted is the single fiber scheme; And what each node adopted is the mode of asynchronous access, and transparent for signal format, greatly reduces the complexity of node and cost (demo system＜30,000 yuan/node).The reduction greatly of system cost has solved vision signal occupied bandwidth resource problem, has improved the utilance of fiber bandwidth.Because system adopts asynchronous access way, therefore the flexibility that inserts of the node that has is the expansion of the system condition of providing convenience.
Claims (3)
1. multi-point video transmitting system with single optical fiber, it is characterized in that, comprise node and with the node camera collection to the receiving node that finally on display, shows of image, described node comprises the camera of gathering vision signal, carry out under the signal road and carry out the optical add/drop multiplexer OADM that wavelength division multiplexing is set out on a journey signal, the vision signal in the node of the output of aforementioned camera and asynchronous access on the way in transmission course is carried out the video transmission module of frequency division multiplexing.
2. a kind of multi-point video transmitting system with single optical fiber according to claim 1, it is characterized in that, constituting of described video transmission module: the following road signal that receives described optical add/drop multiplexer output is the photodetector of the signal of telecommunication with this time road conversion of signals also, the amplifying circuit that will amplify from the signal of telecommunication of photodetector, with described camera collection to picture signal carry out the mixer of frequency division multiplexing through the FM visual modulator modulation back and the output of signal amplification circuit, the output of above-mentioned mixer is carried out the direct sunshine intensity modulated and is had the laser of identical wavelength with described time road signal.
3. a kind of multi-point video transmitting system with single optical fiber according to claim 1, it is characterized in that, described node is 100, in the node 1～25, FM visual modulator carrier frequency is f1, laser wavelength is respectively λ 1～λ 25 and corresponding one by one with node, in the node 26～50, FM visual modulator carrier frequency is f2, laser wavelength is respectively λ 1～λ 25 and corresponding one by one with node, in the node 51～75, FM visual modulator carrier frequency is f3, and laser wavelength is respectively λ 1～λ 25 and corresponding one by one with node, in the node 76～100, FM visual modulator carrier frequency is f4, and laser wavelength is respectively λ 1～λ 25 and corresponding one by one with node, and the road is consistent with the laser wavelength of this intranodal with the wavelength of setting out on a journey under each node.
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| CNB2006100130087A CN100433834C (en) | 2006-01-04 | 2006-01-04 | Multi-point video transmitting system with single optical fiber |
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| CNB2006100130087A CN100433834C (en) | 2006-01-04 | 2006-01-04 | Multi-point video transmitting system with single optical fiber |
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| CN100433834C true CN100433834C (en) | 2008-11-12 |
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Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106197495B (en) * | 2013-11-21 | 2018-05-11 | 佛山市冰蓝科技有限公司 | Using fibre optic isolater and the laser sensor frequency division multiplexing device of fiber grating |
| CN107295429B (en) * | 2017-05-26 | 2020-04-28 | 清华大学 | Optical switching node device using wavelength as address label |
| CN110557613A (en) * | 2019-09-04 | 2019-12-10 | 深圳供电规划设计院有限公司 | Distributed video monitoring system and method |
| CN114619962A (en) * | 2022-03-15 | 2022-06-14 | 上海赫千电子科技有限公司 | Automatic driving system with asymmetric transmission |
| CN115035667B (en) * | 2022-05-13 | 2024-09-13 | 南京邮电大学 | Photon fence system for optical fiber mode division multiplexing real-time video transmission |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5321540A (en) * | 1990-11-30 | 1994-06-14 | Hitachi, Ltd. | Optical frequency division multiplexing network |
| CN1383277A (en) * | 2002-06-13 | 2002-12-04 | 上海交通大学 | Method for multiplexing optical marker by co-channel subcarriers |
| CN1458752A (en) * | 2003-06-25 | 2003-11-26 | 北京邮电大学 | Light carrier frequence division multiplex transmission system |
| CN1694387A (en) * | 2005-05-23 | 2005-11-09 | 电子科技大学 | Wave-division frequency division multiplex system of optics fiber fabry-perot sensor |
| EP1608097A2 (en) * | 2004-06-16 | 2005-12-21 | Lucent Technologies Inc. | Optical add/drop multiplexer having a banded channel configuration |
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2006
- 2006-01-04 CN CNB2006100130087A patent/CN100433834C/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5321540A (en) * | 1990-11-30 | 1994-06-14 | Hitachi, Ltd. | Optical frequency division multiplexing network |
| CN1383277A (en) * | 2002-06-13 | 2002-12-04 | 上海交通大学 | Method for multiplexing optical marker by co-channel subcarriers |
| CN1458752A (en) * | 2003-06-25 | 2003-11-26 | 北京邮电大学 | Light carrier frequence division multiplex transmission system |
| EP1608097A2 (en) * | 2004-06-16 | 2005-12-21 | Lucent Technologies Inc. | Optical add/drop multiplexer having a banded channel configuration |
| CN1694387A (en) * | 2005-05-23 | 2005-11-09 | 电子科技大学 | Wave-division frequency division multiplex system of optics fiber fabry-perot sensor |
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