CN2515878Y - Optical transmitter-receiver - Google Patents
Optical transmitter-receiver Download PDFInfo
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- CN2515878Y CN2515878Y CN01258021U CN01258021U CN2515878Y CN 2515878 Y CN2515878 Y CN 2515878Y CN 01258021 U CN01258021 U CN 01258021U CN 01258021 U CN01258021 U CN 01258021U CN 2515878 Y CN2515878 Y CN 2515878Y
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- optical
- amplifier
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- digital signal
- video
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Abstract
The utility model relates to an optical terminal which is used for a technical grade special optical fiber communication network, and comprises an optical transmitter and an optical receiver, wherein the optical transmitter comprises a digital signal receiving channel and a video signal transmitting channel which comprises a two-stage amplifier and an optical transmitter D7; the receiving channel is composed of an optical receiver D8, a preamplifier, a main amplifier and an RS422 inverse transformer. The optical receiver comprises a digital signal transmitting channel and a video signal receiving channel which comprises an optical receiver D1, a high-frequency amplifier, a feedback amplifier, a video amplifier and a simultaneous embedding position circuit; the transmitting channel is composed of an RS422 transformer, a power amplifier and an optical transmitter D9. The utility model is split into two separate modular structures convenient for usage and maintenance, and can be directly accessed into the existing video digital system, with the advantages of low power consumption, small harmonic distortion, large band width, 60 db of signal to noise ratio and good anti-interference ability. The probation on site proves that the utility model has stable running, 10 to 6 bit error rate and transmission range of over 5 km.
Description
Technical field
The utility model relates to the optical transceiver that is used for technical grade special optic fibre communication network.
Background technology
In the general industry transmission system, 4km uses coaxial cable, twisted-pair feeder etc. with interior transmission means more at present, uses coaxial cable, the decay of twisted-pair feeder transmission signals greatly, and transmission range is short, poor anti jamming capability.
Summary of the invention
The purpose of this utility model is to overcome the above-mentioned deficiency of prior art, is provided for the optical transceiver of technical grade special optic fibre communication network, i.e. optical sender and optical receiver are to satisfy the demand of broadband communication network.
The utility model optical transceiver comprises optical sender and optical receiver two parts, and optical sender, optical receiver are an independently modular construction, and both corresponding input/output terminals connect by a pair of optical fiber.
Optical sender comprises vision signal sendaisle and digital signal receive path, its vision signal transmission channel is made up of amplifier 1, power amplifier 2 and optical transmitting set D7 (LD), optical transmitting set D7 is connected to power amplifier 2 output loops, vision signal (VIDEO IN) is amplified by described amplifier 1,2, is transformed into light signal by optical transmitting set D7 and sends;
Its digital signal receive path is made up of optical receiver D8 (LD), preposition amplification 3, main amplifier 4 and RS422 inverse transform circuit 6, optical receiver D8 is connected to preposition amplification 3 input circuits, and main amplifier 4 output digital signals are received RS422 inverse transform circuit 6 inputs.
Optical receiver comprises video reception passage and digital signal transmission channel, its video reception passage is made up of feedback amplifier 11, the video amplifier 14 and the synchronous clamped circuit 13 of optical receiver D1 (LD), high-frequency amplifier 10, compensatory network, described each circuit unit connects successively, and the synchronizing signal of synchronous clamped circuit 13 outputs is returned the video amplifier 14 another inputs makes synchronizing signal clamped;
Its digital signal transmission channel is made up of RS422 converter 15, power amplifier 16 and the optical transmitting set D9 (LD) that driven by power amplifier.
The optical sender of the utility model optical transceiver, optical receiver are an independently modular construction, compact conformation, and input/output port connects by plug connector, use, easy to maintenance.It is low in energy consumption, and harmonic distortion is little, bandwidth wide (5HZ-10MHZ), DG＜5%, DP＜5%, signal to noise ratio are 60db, number compatible RS232, RS422, TTL transformer (NRZ1, Manchester, two-phase), data transmission bauds is: DC-100 baud (NRZ), it is good to do jamming performance.
Optical transceiver is used for optical fiber communication, and it is stable through on-the-spot probationary certificate, and the error rate is 10-6, and transmission range can reach 5km, installs and simply can directly insert existing digital video treatment system, product price ratio height.It utilizes wavelength-division multiplex technique to send video on one standard 62.5/125 multimode optical cable and receives data, power output 25 μ W receiving sensitivity 14db.
Description of drawings
Fig. 1 is a structure chart of the present utility model;
Fig. 2 is its schematic diagram;
Fig. 3 is the typical circuit figure of its optical sender;
Fig. 4 is the typical circuit figure of its optical receiver;
Fig. 5 is that it uses schematic diagram.
Embodiment
Shown in Figure 1 as structure, this optical transceiver comprises optical sender and optical receiver two parts, optical sender and optical receiver are an independently modular construction, Fig. 1 a, Fig. 1 b are respectively optical transmitter module and optical receiver module, input/output end port connects by plug connector, use, easy to maintenance.
The principle of its optical receiver and optical sender, enforcement circuit are referring to Fig. 2-4.
Optical sender comprises vision signal sendaisle and digital signal receive path.Its vision signal transmission channel is made up of amplifier 1, power amplifier 2 and optical transmitting set D7 (LD), vision signal (VIDEO IN) is amplified by described amplifier 1,2, be transformed into light signal by optical transmitting set D7 and send out, by the video reception passage of Optical Fiber Transmission to optical receiver.
Its digital signal receive path comprises optical receiver D8 (LD), preposition amplification 3, main amplifier 4 and RS422 inverse transform circuit 6; Also can comprise recommending and amplify change-over circuit 7 or RS232 transducer 9, or recommend and amplify change-over circuit 7 and RS232 transducer 9.Optical receiver D8 is connected to preposition amplification 3 input circuits, and RS422 inverse transform circuit 6 inputs are received in main amplifier 4 outputs, recommend amplification change-over circuit 7 and RS232 transducer 9 inputs and are connected to RS422 inverse transform circuit 6 outputs.Main amplifier 4 output signals via RS422 inverse transform circuit 6 be transformed to the RS422 signal directly output carry out line traffic control, or the RS422 signal is transformed into the output of RS232 signal through RS232 transducer 9 again and carries out line traffic control; Or the RS422 signal sends into to recommend again and amplifies change-over circuit 7 and be converted to coaxial signal, is output as the coaxial control of looking through coaxial line.
With reference to figure 3, amplifier 1, power amplifier 2 are that triode (Q1, Q2) and peripheral Resistor-Capacitor Unit thereof are formed the common emitter amplifying circuit, and Q2 emitter-base bandgap grading access potentiometer CW and two resistance circuits can make things convenient for the adjusting of power.
Above-mentioned preposition amplification 5 is made up of triode Q5-Q8 and corresponding Resistor-Capacitor Unit, and optical receiver D8 is connected between Q5 base stage and the emitter.Main amplifier 4 is formed feedback by Resistor-Capacitor Units such as Q9-Q11 and is amplified, and the Q11 output signal feeds back to the Q9 base stage through R25, and two amplifiers adopt capacitive coupling.Recommending amplification change-over circuit 7 mainly is made up of metal-oxide-semiconductor Q3, Q4.RS422 inverse transformation 6 can adopt circuit such as SN75179.RS232 transducer 9 can be selected HIN232 etc. for use.
Optical receiver comprises video reception passage and digital signal transmission channel.Its video reception passage is made up of feedback amplifier 11, the video amplifier 14 and the synchronous clamped circuit 13 of optical receiver D1 (LD), high-frequency amplifier 10, compensatory network, described each circuit unit connects successively, and the synchronizing signal of synchronous clamped circuit 13 outputs is returned the video amplifier 14 another inputs makes synchronizing signal clamped.Its digital signal transmission channel is made up of RS422 converter 15, power amplifier 16 and the optical transmitting set D9 (LD) that driven by power amplifier.
With reference to figure 4, Q1 ', Q3 ' etc. form amplifier 10, Q3 ' forms feedback and amplifies 11, Q3 ' emitter-base bandgap grading connects by L1, C2, R17 forms compensating network, vision signal after the compensation is exported one the tunnel and is input to dedicated video amplifier AD0842, AD0842 output also compares through the 3 pin input that C19 feeds back to TL082, and output is regulated Q4 ', makes synchronizing signal clamped.RS422 converter 15 adopts circuit such as LTC490CN8.Power amplifier 16 is made up of the resistance R 37 and the light-emitting tube D9 of metal-oxide-semiconductor Q5 ' and output loop thereof.
Its course of work is as follows:
In transmitter, the vision signal (VIDEO IN) of coming from the outside is input to amplifier Q1 base stage through J2, and after Q1, Q2 common emitter amplified, output signal was transformed into light signal to optical transmitting set D7 and sends.
And the digital signal that optical receiver D8 receives (light signal becomes the signal of telecommunication) is through the preposition amplification of base stage input carrying out of Q5, and carry out AGC control with the base stage that the emitter feedback signal of Q7 is returned Q5, signal after the amplification amplifies through (Q9, Q10, Q11) master behind the C18 differential again, Q11 output feeds back to the Q9 base stage through R25 and carries out AGC control, output signal to recommend and amplify change-over circuit (Q3, Q4) and amplify conversion, export through coaxial line, or carry out the RS422 contravariant via SN75179 and change RS422 signal output into, or be transformed into RS232 output through HIN232.
In receiver, optical receiver D1 receiver, video is after height is put the pipe amplification, form by Q2 ', Q3 ' again and amplify feedback loop, vision signal output after the compensation divides two-way, one the tunnel is input to the special-purpose chip AD0842 that amplifies carries out video amplification output, and output signal also compares through the 3 pin input that C19 feeds back to TL082, and output is regulated Q4 ', makes synchronizing signal clamped.Another road is carried out AGC control through TL082 by another comparison signal end input and through R30, R29 and return light receiver D1.
In receiver, digital signal is transformed into the RS422 signal by LTC490CN8, is launched by optical transmitting set D9 behind the power amplifier.
Fig. 5 is that it uses schematic diagram.Product can directly insert and have now in the CCTV system, and energy is transmission of video and reception data-signal simultaneously, and the vision signal that transmits from Video source can pass to receiver by optical fiber through transmitter, and outputs to the Monitor demonstration by VIDEO OUT.Digital controlled signal is then handled by receiver input, and is sent to the input of transmitter through optical fiber, through amplifying, outputing to front end after the conversion.
This product uses optical fiber communication, and it is stable to use proof through the scene, and the error rate is 10-6, and transmission range can reach 5km, and easy to use, installs and simply can directly insert existing digital video treatment system, product price ratio height.This product utilization wavelength-division multiplex technique sends video and receives data, power output 25 μ W receiving sensitivity 14db on one standard 62.5/125 multimode optical cable.
Claims (5)
1, a kind of optical transceiver comprises optical sender and optical receiver two parts, it is characterized in that:
Optical sender comprises vision signal transmission channel and digital signal receive path, its vision signal transmission channel is made up of amplifier (1), power amplifier (2) and optical transmitting set D7, optical transmitting set D7 is connected to power amplifier (2) output loop, vision signal (VIDEO IN) is amplified by described amplifier (1,2), is transformed into light signal by optical transmitting set D7 and sends; Its digital signal receive path is made up of optical receiver D8, preposition amplification (3), main amplifier (4) and RS422 inverse transform circuit (6), optical receiver D8 is connected to preposition amplification (3) input circuit, and main amplifier (4) output digital signal is received RS422 inverse transform circuit (6) input;
Optical receiver comprises video reception passage and digital signal transmission channel, its video reception passage is made up of feedback amplifier (11), the video amplifier (14) and the synchronous clamped circuit (13) of optical receiver D1, high-frequency amplifier (10), compensatory network, described each circuit unit connects successively, the synchronizing signal of synchronous clamped circuit (13) output is returned the video amplifier (14), and another input makes synchronizing signal clamped; Its digital signal transmission channel is made up of RS422 converter (15), power amplifier (16) and the optical transmitting set D9 that driven by power amplifier.
2, according to the described optical transceiver of claim 1, it is characterized in that: described optical sender, optical receiver are an independently modular construction, and both channel video signals are connected by a pair of optical cable with the digital signal passage.
3, according to the described optical transceiver of claim 1, it is characterized in that: the RS422 inverse transform circuit (6) of the digital signal receive path of described optical sender adopts the SN75179 circuit.
4, according to the described optical transceiver of claim 1, it is characterized in that: the digital signal receive path of described optical sender also comprises recommends amplification change-over circuit (7), or RS232 transducer (9), or recommend and amplify change-over circuit (7) and RS232 transducer (9), recommend the output that amplification change-over circuit (7) and RS232 transducer (9) all are connected to RS422 inverse transform circuit (6).
5, according to the described optical transceiver of claim 4, it is characterized in that: the RS232 transducer (9) of the digital signal receive path of described optical sender adopts the HIN232 circuit, recommends amplification change-over circuit (7) and is made up of metal-oxide-semiconductor Q3, Q4.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN01258021U CN2515878Y (en) | 2001-11-13 | 2001-11-13 | Optical transmitter-receiver |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN01258021U CN2515878Y (en) | 2001-11-13 | 2001-11-13 | Optical transmitter-receiver |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2515878Y true CN2515878Y (en) | 2002-10-09 |
Family
ID=33666670
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN01258021U Expired - Fee Related CN2515878Y (en) | 2001-11-13 | 2001-11-13 | Optical transmitter-receiver |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2515878Y (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100439650C (en) * | 2003-06-12 | 2008-12-03 | 上海光导传输技术研究所 | Deep well detection optical-fiber transmission system |
| CN100452873C (en) * | 2006-12-29 | 2009-01-14 | 蒋金甫 | Rural broadcasting TV system based on FM optical termining machine and implementing method |
-
2001
- 2001-11-13 CN CN01258021U patent/CN2515878Y/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100439650C (en) * | 2003-06-12 | 2008-12-03 | 上海光导传输技术研究所 | Deep well detection optical-fiber transmission system |
| CN100452873C (en) * | 2006-12-29 | 2009-01-14 | 蒋金甫 | Rural broadcasting TV system based on FM optical termining machine and implementing method |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20021009 Termination date: 20101113 |