CN203883843U - Optical communication system - Google Patents
Optical communication system Download PDFInfo
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- CN203883843U CN203883843U CN201420307885.5U CN201420307885U CN203883843U CN 203883843 U CN203883843 U CN 203883843U CN 201420307885 U CN201420307885 U CN 201420307885U CN 203883843 U CN203883843 U CN 203883843U
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Abstract
The utility model discloses an optical communication system which includes a wireless transmitting device and at least one information receiving terminal. The wireless transmitting device includes a visible light transmitting unit which is used for transmitting a visible light signal and an infrared receiving unit which is used for receiving an infrared signal. Each information receiving terminal includes a visible light receiving unit which is used for receiving the visible light signal and an infrared transmitting unit which is used for transmitting the infrared signal. The optical communication system is advantaged in that a visible light is used as a down-link transmission wave band and an infrared light is used as an up-link transmission wave band so that the visible light and the infrared light are free from interfering with each other.
Description
Technical field
The utility model relates to visible light communication technical field, relates in particular to a kind of optical communication system.
Background technology
The product such as existing LED lighting on the market, all only be to provide the required functional lighting demand in place, want the words of online, must or use the Optical Fiber Transmission that everybody knows, obtain bracing wire, arrange net, use as the wireless transmission such as bluetooth, Wi-Fi, WiMax and LTE all tool be electromagnetic wave, may be detrimental to health or disturb the running of electronic instrument, such as application such as hospital and aircrafts---under this occasion, radio frequency may disturb the signal in vital equipment.Because radio wave transmissions, plant capacity is increasing, and local electromagnetic radiation certainly will strengthen; Through walls and the mistake of wireless signal, the network information is dangerous.And in places such as hospital, aircrafts, normally use not.
Therefore utility model is a kind of (is visible optical communication technique (Visible Light Communications with visible light communication technology, VLC) LED light fixture, visible light communication can be realized illumination and the function of communicating by letter simultaneously, there is transmission data rate high, strong security, without electromagnetic interference, without advantages such as frequency spectrum authentications, be one of desirable indoor and outdoor high-speed radio access scheme.
On the other hand, approximately large 10,000 times than radio-frequency spectrum of spectrum, have larger bandwidth and the speed of Geng Gao, and visible light communication network is set needs new infrastructure hardly, can meet illumination and the demand of communicating by letter simultaneously.Therefore, with the LED light fixture of visible light communication, will in following communications field, will occupy consequence, and will promote widely the development of informationized society.
Utility model content
The technical problems to be solved in the utility model is, the problem for transmission of wireless signals safety in above-mentioned public arena and wireless signal radiation, provides a kind of optical communication system.
The utility model solves the technical scheme that its technical problem adopts: construct a kind of optical communication system, comprise a wireless launcher and at least one information receiving terminal, described wireless launcher comprises for launching the VISIBLE LIGHT EMISSION unit of visible light signal and for receiving the infrared receiver of infrared signal; Described in each, information receiving terminal comprises for receiving the visible ray receiving element of described visible light signal and for launching the infrared emission unit of described infrared signal;
Wherein, described VISIBLE LIGHT EMISSION unit comprise visible ray modulated current generator, the visible ray differential driver being electrically connected with described visible ray modulated current generator and the light source generator being electrically connected with described visible ray differential driver;
The preamplifier that described visible ray receiving element comprises photodetector, be electrically connected with described photodetector, the main amplifier being electrically connected with described preamplifier, the equalizer being electrically connected with described main amplifier, the arbiter being electrically connected with described equalizer, the decoder being electrically connected with described arbiter;
Described infrared emission unit comprises infrared modulated current feedback circuit, the infrared differential driver being electrically connected with described infrared modulated current feedback circuit and the infrared emittance being electrically connected with described infrared differential driver;
The integrated circuit that described infrared receiver comprises infrared detecting unit, is electrically connected with described infrared detecting unit.
In system of the present invention, described arbiter is also electrically connected with described preamplifier, with the clock signal of extracting described preamplification signal to carry out electrical level discrimination.
In system of the present invention, described preamplifier comprises trans-impedance amplifier, the differential signal transducer being electrically connected with described trans-impedance amplifier and the differential amplification output unit being electrically connected with described differential signal transducer.
In system of the present invention, described main amplifier comprises input buffer, the casacade multi-amplifier being electrically connected with described input buffer and the output buffer cell being electrically connected with described casacade multi-amplifier.
In system of the present invention, described preamplifier and described main amplifier carry out resistance-capacitance coupling.
Implement a kind of optical communication system of the present utility model, there is following beneficial effect: adopt visible ray as downlink transmission wave band, adopt infrared light as ul transmissions wave band, both can phase mutual interference.
Accompanying drawing explanation
Below in conjunction with drawings and Examples, the utility model is described in further detail, in accompanying drawing:
The optical communication system block diagram that Fig. 1 provides for the utility model;
The optical communication system schematic diagram that Fig. 2 provides for the utility model;
The structural representation of the VISIBLE LIGHT EMISSION unit that Fig. 3 provides for the utility model;
The block diagram of the visible ray receiving element that Fig. 4 provides for the utility model;
Fig. 5 is the structural representation of preamplifier;
Fig. 6 is the structural representation of main amplifier;
Fig. 7 is the connection diagram of preamplifier and main amplifier;
The structural representation of the infrared emission unit that Fig. 8 provides for the utility model;
The structural representation of the infrared receiver that Fig. 9 provides for the utility model.
Embodiment
For technical characterictic of the present utility model, object and effect being had more clearly, understand, now contrast accompanying drawing and describe embodiment of the present utility model in detail.
The utility model is by installing in public a wireless launcher 1, in the transmitting visible light signal information receiving terminal 2 that extremely a plurality of users hold, simultaneously, information receiving terminal 2 returns to an infrared signal to wireless launcher 1, thereby wireless launcher 1 reaches the effect that wireless routing divides photos and sending messages.Scheme provided by the utility model not only more traditional communication has larger bandwidth, has also increased the fail safe of signal transmission.
The optical communication system block diagram that Fig. 1 provides for the utility model, as shown in Figure 1, this system comprises a wireless launcher 1 and at least one information receiving terminal 2, pass through visible light communication, information is emitted to from wireless launcher 1 at least one information receiving terminal 2, visible light communication technology is that the high speed light and shade flash signal being invisible to the naked eye of utilizing fluorescent lamp or light-emitting diode etc. to send is carried out transmission information, the wire device of high-speed Internet is connected on lighting device, inserts attaching plug and can use.
Therefore described wireless launcher 1 comprises VISIBLE LIGHT EMISSION unit 11 and infrared receiver 12; Described in each, information receiving terminal 2 comprises visible ray receiving element 21 and infrared emission unit 22;
Described VISIBLE LIGHT EMISSION unit 11 is for launching visible light signal to described visible ray receiving element; Described visible ray receiving element 21 is for receiving described visible light signal; Described infrared emission unit 22 is for launching infrared signal to described infrared receiver 12; Described infrared receiver 12 is for receiving described infrared signal.
For example: by generation, launch the signal of telecommunication, such as " 1 ", " 0 ", control corresponding LED light fixture and send corresponding light signal, this signal can be by obtaining from the Internet, also can by control circuit, produce voluntarily, because it is the wireless technology of zero electromagnetic wave, zero radiation that LED light fixture provides visible light communication, LED lamp is applicable to doing the light source of visible light communication very much, realizes the optical communication of higher rate in illumination.LED is luminous is in fact flickering, because flash very high frequency, our naked eyes " function " too difference can not be distinguished out, this flashing is exactly a kind of open and close process in fact, and this one open-one close of LED just can have been born the task of transmission information, such as, open just representative " 1 ", close just representative " 0 ", by namely 0 and 1 various combinations of information coding, just can transmit by light.Using light as VISIBLE LIGHT EMISSION unit 11, can be applied to aircraft waiting hall for airplanes, hospital waits hall, or directly apply in aircraft, by being arranged in the LED reading lamp on birdman's seat, using this LED reading lamp as a Network Access Point, place below and just can pass through corresponding receiving system receiving broadcasting information; Or in hospital, the radio communication of frequency electromagnetic waves type is disturbed and may be caused damage to some instrument, particularly, in operation, also can control safely, efficiently some equipment or transmission x-ray image etc. with visible light communication this time so.
In addition, with infrared light emission unit 22, data are sent to the infrared receiver 12 in VISIBLE LIGHT EMISSION device 1 to realizing wireless data by the mutual conversion between data electric pulse and infrared light pulse.Reach two-way communication and realize transfer of data, can avoid the light signal of two-way visible light communication to disturb.
The optical communication system schematic diagram that Fig. 2 provides for the utility model, as shown in Figure 2, wireless launcher 1 can carry out the transmission of one-way visible light and unidirectional infrared transmission with a plurality of information receiving terminals 2, concrete, down link adopts transmission of visible light, and down link adopts infrared transmission.
Referring to Fig. 3, the structural representation of the VISIBLE LIGHT EMISSION unit that Fig. 3 provides for the utility model, described VISIBLE LIGHT EMISSION unit 11 comprises modulated current generator 111, the differential driver 112 being electrically connected with described modulated current generator 111 and the light source generator 113 being electrically connected with described differential driver 112; Described current feedback circuit 111 is for modulating the operating current of described differential driver 112 according to the described transmitting signal of telecommunication; Described differential driver 112 is for adjusting the operating state of described light source generator 113 according to described operating current; Described light source generator 113 is for producing described visible light signal according to described operating state.For example: modulated current generator 111 is controlled and exported to the general LED light source or big or small for the current amplitude of array light source that adopts of light source generator 113, and modulated current generator 111 consists of an integrated operational amplifier, a NPN type triode.The in-phase input end of integrated operational amplifier connects reference voltage generator, and reverse input end is directly linked transistor emitter and formed negative feedback, and the input voltage value of reverse input end is chosen the current potential of transistor emitter.The effect of resistance R 1 is exactly that reverse input end for integrated operational amplifier provides input voltage.The operation principle of modulated current generator is: integrated transporting discharging, by comparison reference voltage and transistor emitter voltage (reference voltage is greater than transistor emitter voltage), amplifies output, then driving N PN type triode by the difference of two voltages.The size of current when collector current of modulated current generator is further controlled the work of differential driver.Therefore, by choosing the size of resistance R 1, just can obtain the collector current of different sizes, and then obtain the drive current of the different sizes of differential driver output.Differential driver consists of two NPN triode T1 and T2, and the collector electrode of T1 connects LED light source, and the collector electrode of T2 connects power supply by a resistance.Q2 is inverting amplifier, and the detection signal of input comparator is become to differential signal, and provides gain to amplify.Differential signal is controlled the base stage of triode T1 and T2, when input comparator detection numerical value is " 1 ", and T1 conducting, T2 cut-off, now LED is luminous, sends signal " 1 "; When input comparator detection numerical value is " 0 ", T1 cut-off, T2 conducting, now LED is not luminous, is equivalent to send signal " 0 ".Differential driver is controlled the opening and closing of array light source by the mutual conduction of two triode T1 and T2, by optical signal modulation to LED array light source.No matter be which triode conducting can both keep stable electric current output, effectively reducing noise and electromagnetic interference.Differential driver is just equivalent to a gating switch, is subject to the control of input buffer detection signal.
Described visible ray receiving element 21 is for receiving described visible light signal; As shown in Figure 4, the block diagram of the visible ray receiving element that Fig. 4 provides for the utility model, the preamplifier 212 that described receiving element 21 comprises photodetector 211, be electrically connected with described photodetector 211, the main amplifier 213 being electrically connected with described preamplifier 212, the equalizer 214 being electrically connected with described main amplifier 213, the arbiter 215 being electrically connected with described equalizer 214, the decoder 216 being electrically connected with described arbiter 215;
Described photodetector 211 is for receiving described visible light signal and described visible light signal being converted into raw electrical signal; For example photodetector 211 adopts PIN photodiode receiving optical signals and changes into current signal.
Described preamplifier 212 is for being enlarged into preamplification signal by described raw electrical signal; As shown in Figure 5, described preamplifier 212 comprise trans-impedance amplifier 212A, the differential signal transducer 212B being electrically connected with described trans-impedance amplifier 212A and the differential amplification output unit 212C being electrically connected with described differential signal transducer 212B.As shown in Figure 7, described preamplifier 212 carries out resistance-capacitance coupling with described main amplifier 213.Resistance-capacitance coupling mode can be brought a lot of benefits: because electric capacity is infinity to the reactance of DC quantity, each does not communicate DC channel between two-stage, quiescent point at different levels is separate, therefore reduced the difficulty of circuit design, and due to the logical high frequency of electric capacity, the characteristic of resistance low frequency, can play the effect of filtering low-frequency interference signal.
Described trans-impedance amplifier 212A is used for amplifying described raw electrical signal; Described differential signal transducer 212B is for being converted to differential signal by the raw electrical signal after amplifying; Described differential amplification output unit 212C is for being converted to described preamplification signal by described differential signal.Wherein, in trans-impedance amplifier 212A, adopt amplifier A1 to form transimpedance amplifier.Feedback resistance R2 is connected across amplifier reverse input end and output, forms negative feedback in parallel, converts input current to voltage.The effect of two diode D1 in parallel and D2 is clamper, the in the situation that of large input current, and the amplitude of restriction output signal, thus reach the object that increases optical receiver dynamic range.After trans-impedance amplifier 212A amplifies, then convert differential signal to through differential signal transducer 212B, then by differential amplification output unit 212C, export.
Described main amplifier 213 is for being enlarged into level amplifying signal by described preamplification signal; As shown in Figure 6, described main amplifier 213 comprise input buffer 213A, the casacade multi-amplifier 213B being electrically connected with described input buffer 213A and the output buffer cell 213C being electrically connected with described casacade multi-amplifier 213B.Wherein, 213 pairs of signals of main amplifier carry out multistage amplification, make signal strength signal intensity meet the needs of judgement regeneration.Preferably, main amplifier 213 has automatic gain (AGC) function, the variation of input signal is made to compensation and control, and keeps amplitude stable of output signal.From the differential signal of preamplifier 212, by input pin IN+ and IN-, enter input buffer, be amplified.Then, signal further amplifies and processes at casacade multi-amplifier 213B place, by AGC function, controls its output amplitude, makes it output amplitude and remains unchanged.Finally, from output buffer cell 213C output.
Input buffer 213A is comprised of a pair of emitter follower and a pair of differential pair tube.Differential signal is according to the Numerical Control transistor T 1 of input and conducting and the cut-off of T2.Then, by transistorized emitter-base bandgap grading output, control the work of differential amplifier.Output buffer is a common emitter differential pair tube, and it is to be controlled by the on-off action of differential pair tube that the low and high level of output signal switches.
Described equalizer 214 is for carrying out wave shape equalization processing to described level amplifying signal; Equalizer is a kind of electronic equipment that can regulate respectively various frequency content signal of telecommunication amplification quantity, by the adjusting of the signal of telecommunication of various different frequencies being compensated to the defect of loud speaker and sound field, compensate and modify various sound sources and other special role, the equalizer on general sound console only can regulate respectively high frequency, intermediate frequency, the low frequency three band frequency signals of telecommunication.In communication system, in strapping system, insert the impact that equalizer can reduce intersymbol interference.
Described arbiter 215 is for the described level amplifying signal carrying out after equilibrium treatment is carried out to electrical level discrimination, to obtain judgment signal; Wherein, described arbiter 215 is also electrically connected with described preamplifier 212, described arbiter 215 also for the clock signal of extracting described preamplification signal to carry out electrical level discrimination.Clock signal is the basis of sequential logic, and when it upgrades for the state of decision logic unit.In edging trigger mechanism, only have rising edge or trailing edge to be only useful signal, the change of ability control logic location mode amount.As for be on earth rising edge or trailing edge as effective triggering signal, depend on the technology of logical design.
Described decoder 216 is for decoding to obtain receiving the signal of telecommunication to described judgment signal.Decoder 216 generally, by the signal after differentiating is decoded, obtains receiving the signal of telecommunication, and this reception signal generally only has two kinds of level, as " 1 ", " 0 ", i.e. digital signal.
The structural representation of the infrared emission unit that Fig. 8 provides for the utility model, as shown in Figure 8, described infrared emission unit 22 comprise infrared modulated current feedback circuit 221, the infrared differential driver 222 being electrically connected with described infrared modulated current feedback circuit 221 and the infrared emittance 223 being electrically connected with described infrared differential driver 222;
Described infrared modulated current feedback circuit 221 is for modulating the operating current of described infrared differential driver 222;
Described infrared differential driver 222 is for adjusting the operating state of described infrared emittance 223 according to described operating current;
Described infrared emittance 223 is for producing described infrared signal according to described operating state.
The structural representation of the infrared receiver that Fig. 9 provides for the utility model, as shown in Figure 9, the integrated circuit 122 that described infrared receiver 12 comprises infrared detecting unit 121, is electrically connected with described infrared detecting unit 121;
Described infrared detecting unit 121 is for being converted into raw electrical signal by described infrared signal;
Described integrated circuit 122 is for identifying described raw electrical signal to receive described infrared signal.
In addition, can also be by adding described in a processing unit processing unit for the described reception signal of telecommunication is converted to play signal in information receiving terminal 2.Arbitrary described information receiving terminal 2 also comprises the playing device being electrically connected with described processing unit, and described playing device is used for playing described play signal.For example, in broadcast system, the play signal receiving can be audio signal, can be also vision signal, or audio-video signal all has, and playing device 23 selects corresponding video player or audio player to play according to the kind of signal.
Simultaneously, can be in the interior installation one visible ray control module of wireless launcher 1, to control specially the transmitting of visible light signal and the reception of infrared signal, this visible ray control module also can be arranged at outside wireless launcher 1, independent of the transmitting of visible light signal and a reception for infrared signal of installing to control this wireless launcher 1; Same, at interior installation one infrared control module of information receiving terminal 2, to control specially the transmitting of infrared signal and the reception of visible light signal, this infrared control module also can be arranged at outside information receiving terminal 2, independent of the transmitting of infrared signal and a reception for visible light signal of installing to control this information receiving terminal 2.
The beneficial effect of the utility model embodiment is:
1, fail safe is good, convenient: adopt room lighting LED light source to realize.
2, transmitting power is high.
3, without radio-frequency spectrum, authenticate.Radio Spectrum Resource is owing to being seemed very limited by control, the current radio frequency that can distribute is wretched insufficiency.
4, without electromagnetic interference.Can be for the occasion to the strict restriction of magnetic disturbance.As hospital, airport etc.
5, communication security is reliable.Due to visible ray is logical can not be through walls, therefore that its communication has strictly been limited in is indoor, make the indoor communication data of outdoor eavesdropping very difficult.
6, channel strip is roomy.Visible optical wavelength scope is larger, and therefore 380-780nm has larger bandwidth.
7, transmission rate is high.The response speed of LED is very fast, therefore can carry out high-speed data communication with LED.Be equipped with appropriate coding and Driving technique, LED can be used in high-speed digital communication more than 100Mb/s.
8, with infrared light, data are sent to the infrared receiver 12 in wireless launcher 1 to realizing wireless data by the mutual conversion between data electric pulse and infrared light pulse.Reach two-way communication and realize transfer of data, avoid the light signal of two-way visible light communication to disturb simultaneously.
By reference to the accompanying drawings embodiment of the present utility model is described above; but the utility model is not limited to above-mentioned embodiment; above-mentioned embodiment is only schematic; rather than restrictive; those of ordinary skill in the art is under enlightenment of the present utility model; not departing from the scope situation that the utility model aim and claim protect, also can make a lot of forms, within these all belong to protection of the present utility model.
Claims (5)
1. an optical communication system, comprises a wireless launcher (1) and at least one information receiving terminal (2), it is characterized in that,
Described wireless launcher (1) comprises for launching the VISIBLE LIGHT EMISSION unit (11) of visible light signal and for receiving the infrared receiver (12) of infrared signal; Information receiving terminal described in each (2) comprises for receiving the visible ray receiving element (21) of described visible light signal and for launching the infrared emission unit (22) of described infrared signal;
Wherein, described VISIBLE LIGHT EMISSION unit (11) comprise visible ray modulated current generator (111), the visible ray differential driver (112) being electrically connected with described visible ray modulated current generator (111) and the light source generator (113) being electrically connected with described visible ray differential driver (112);
The preamplifier (212) that described visible ray receiving element (21) comprises photodetector (211), be electrically connected with described photodetector (211), the main amplifier (213) being electrically connected with described preamplifier (212), the equalizer (214) being electrically connected with described main amplifier (213), the arbiter (215) being electrically connected with described equalizer (214), the decoder (216) being electrically connected with described arbiter (215);
Described infrared emission unit (22) comprises infrared modulated current feedback circuit (221), the infrared differential driver (222) being electrically connected with described infrared modulated current feedback circuit (221) and the infrared emittance (223) being electrically connected with described infrared differential driver (222);
The integrated circuit (122) that described infrared receiver (12) comprises infrared detecting unit (121), is electrically connected with described infrared detecting unit (121).
2. system according to claim 1, is characterized in that, described arbiter (215) is also electrically connected with described preamplifier (212), with the clock signal of extracting described preamplification signal to carry out electrical level discrimination.
3. system according to claim 2, it is characterized in that, described preamplifier (212) comprises trans-impedance amplifier (212A), the differential signal transducer (212B) being electrically connected with described trans-impedance amplifier (212A) and the differential amplification output unit (212C) being electrically connected with described differential signal transducer (212B).
4. system according to claim 3, it is characterized in that, described main amplifier (213) comprises input buffer (213A), the casacade multi-amplifier (213B) being electrically connected with described input buffer (213A) and the output buffer cell (213C) being electrically connected with described casacade multi-amplifier (213B).
5. system according to claim 4, is characterized in that, described preamplifier (212) carries out resistance-capacitance coupling with described main amplifier (213).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420307885.5U CN203883843U (en) | 2014-06-10 | 2014-06-10 | Optical communication system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420307885.5U CN203883843U (en) | 2014-06-10 | 2014-06-10 | Optical communication system |
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| Publication Number | Publication Date |
|---|---|
| CN203883843U true CN203883843U (en) | 2014-10-15 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420307885.5U Active CN203883843U (en) | 2014-06-10 | 2014-06-10 | Optical communication system |
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| CN (1) | CN203883843U (en) |
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- 2014-06-10 CN CN201420307885.5U patent/CN203883843U/en active Active
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Address after: 518040 West, 3rd floor, block B1, building f5.8, Tianji building, Tian'an Digital City, chegongmiao, Futian District, Shenzhen City, Guangdong Province Patentee after: Shenzhen Date Culture Technology Co.,Ltd. Address before: 518040 West, 3rd floor, block B1, building F58, Tianji building, Tian'an Digital City, chegongmiao, Futian District, Shenzhen City, Guangdong Province Patentee before: SHENZHEN DART ILLUMINATION Co.,Ltd. |
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