CN2456379Y - Optical receiving and transmitting terminal facility - Google Patents
Optical receiving and transmitting terminal facility Download PDFInfo
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- CN2456379Y CN2456379Y CN00245224U CN00245224U CN2456379Y CN 2456379 Y CN2456379 Y CN 2456379Y CN 00245224 U CN00245224 U CN 00245224U CN 00245224 U CN00245224 U CN 00245224U CN 2456379 Y CN2456379 Y CN 2456379Y
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Abstract
The utility model relates to an optical signal receiving and transmitting terminal facility. Audio signals are input to a subcarrier modulator; video signals are input to a video processor 3; outputs of both signals are connected with an input of a combiner of which an output is connected with an input of a baseband amplifier 4; an output of the baseband amplifier 4 is connected with an input of a modulator 5 of which an output is connected with an input of an optical emitter 6; an output of the optical emitter 6 is connected with an input of an optical receiver 8 through an optical fiber 7; an output of the optical receiver 8 is connected with an input of a demodulator of which an output of a splitter 10; one output of the splitter is connected to a subcarrier demodulator 11, and the other output is connected with a video processor 12. One path of color TV signals and two paths of audio signals can be transmitted via an optical fiber, and transmission quality achieves a high quality level for broadcast.
Description
The utility model and video, audio frequency or digital signal fiber transmission device are relevant, and be especially relevant with the light-receiving terminal with light emission terminal.
Microwave and amplitude modulation optical fiber technology etc. have been adopted in the transmission of advertisement TV signal.
1, microwave transmission is sighting distance, wireless transmission, and transmission bandwidth is narrower and be subjected to the influence of meteorology, geographical conditions very big, and transmission quality is relatively poor.
2, amplitude modulation optical fiber TV transmission program is many, the shared narrow bandwidth of every channel, but cost height, transmission range are short, as adopting the non-relay distance of 1310nm less than 30Km, are applicable to the transmission of TV downstream broadband.
The purpose of this utility model provides and a kind ofly is applicable to that 100 kilometers are passed through with interior that the light that an optical fiber transmits one road colour TV signal and two-way audio or data-signal is simultaneously received, light letter terminal.
Another purpose of the present utility model is to make the transmission signals quality reach the broadcast level level.
The utility model is achieved in that
The utility model is that a kind of light is received, the terminal of posting a letter, audio signal is respectively from A1 and A2 port input subcarrier frequecy modulation device 1, the output of subcarrier frequecy modulation device 1 connects the input of mixer 2, vision signal is from V port input video processor 3, the output of video processor 3 connects the input of mixer 2, the output of closing road circuit 2 connects the input of baseband amplifier 4, the output of baseband amplifier 4 connects the input of PFM modulator 5, the output of PFM modulator 5 connects the input that light is sent out device 6, the output that light is sent out device 6 connects the input that light is received device 8 through optical cable 7, the output of light receipts device 8 connects the input of PFM demodulator 9, the output of demodulator 9 connects the input of splitter 10, one tunnel output of splitter 10 connects subcarrier demodulator 11, and another road output of splitter 10 connects the input of video processor 12.
The audio preemphasis circuit that the input of the utility model subcarrier frequecy modulation device 1 is made up of R2, C1 and R19, C13, its output connects 14 pin of ic chip 1 and IC2, inductance T1, T2 is connected between IC1 and IC2 and 2,3 pin, IC1, the output of IC2 connects the amplifier in that transistor Q1, Q2 and Q3, Q4 form through 13 pin, and amplifier out connects the mixer 2 that R39-R41 forms through band pass filter.
The utility model video processor 3 is a low pass filter, and its output connects the mixer 2 that R39-R41 forms, and mixer output connects amplifier 4, and amplifier 4 is IC3, and the output of IC3 connects modulator-demodulator from 7 pin through emitter follower.
The utility model PFM modulator is the voltage-controlled multivibrator IC4 of integrated circuit, and its 2 pin is an input, and its 4,6 pin connects 3 pin and 4 pin of integrated temperature compensating circuit IC5, and its 6 pin connects the Q2 emitter follower, and the output of Q2 connects light and sends out device 6 through amplifier Q5 behind the Q6.
The utility model light is sent out device 6 and is sent ic chip 6 by light and form, and 9 pin of IC6 connect the collector electrode of Q5 and Q6, connect the base stage of Q7.
The light signal that the utility model sends enters light-receiving integrated package OP through optical fiber 7, be coupled to PFM FM demodulator 9 from the 4 foot meridian capacitor C2 of OP, FM demodulator 9 is made up of ic chip 7-IC11, the output of FM demodulator 9 from 13 pin of IC11 behind low pass filter, deliver to 1 pin of IC12 baseband amplifier by C20,7 of IC12,8 pin are by Q2, Q4 and Q1, the Q3 emitter follower, baseband signal is divided into two-way, and 4,5,6 pin of IC7 connect the reception indicating circuit that diode D1-D3, transistor and light-emitting diode D4 form.
The output of the utility model splitter 10 is through being capacitively coupled to 1 pin of IC15, the 8 pin output of IC15 obtains vision signal through emitter follower and low pass filter, vision signal is imported 1 pin of IC16 amplifier again, export from 8 pin, divide in addition behind Q6, Q7 and Q8, Q9 emitter follower, respectively from V10UT and V20UT output.
The utility model from the baseband signal of PFM demodulator 9 output through high pass filter with the vision signal filtering, audio baseband signal is amplified through amplifier, and is divided into A1, A2 two-way subcarrier circuit.
The utility model A1, A2 two paths of signals be respectively through band pass filter, and amplifier is again through IC17, the voltage-controlled FM demodulator of IC19, and from 14 pin output audio signals, audio signal is through emitter follower and IC18, and the IC20 audio frequency amplifier is from A1/OUT and A2/OUT output.
The utility model IC1 and IC2 are MC1374, and IC3 is NE592, and IC4 is MC1648AP, IC5 is LM358, and IC6 is LDM354SS, and OP is PFWM921, IC7 and IC8 are MC10116, IC9 and IC10 are MC10107, and IC11 is MC10125, IC12, IC15, IC16 is NE592, and IC17 and IC19 are NE564, and IC18 and IC20 are LM358.
The utlity model has good video, audio-frequency index, can be used for the small towns to the TV in county passback and long apart from live television coverage, TV close and up satellite or microwave station between, program transmission between launching tower and the studio, the transmission of industrial television, the transmission of traffic and public security TV monitoring and controlling signal, and field such as remote tv teaching.At the light-receiving terminal luminous power indicator light is housed, very convenient to monitoring, detecting.The key technical indexes of the present utility model is as follows:
1, optical wavelength: single mode, 1310nm.
2, luminous power output: 100 μ W～400 μ W.
3, optical interface: FC/PC seat or FC/APC seat (free) by the user.
4, video is signal to noise ratio (unified weighting) at random: 62dB.
5, video amplitude-frequency characteristic :≤native 1dB. (in the 5MHz).
6, look bright delay inequality :≤± 30nS.
7, look bright gain inequality :≤± 6%.
8, differential gain DG :≤± 1.5%.
9, differential phase DP :≤± 1 °.
10, video interface: 1VP-P/75 Ω.
11, audio interface: 775mV/600 Ω.
12, total harmonic distortion:＜1%.
13, audio frequency signal to noise ratio: S/N:55dB.
14, the audio frequency amplitude-frequency characteristic: (40～15KHz)≤± 1dB.
15, power supply: 220V ± 10% (50Hz).
16, transceiver power all is not more than 30VA.
17, overall dimensions: 430 * 330 * 43mm
3
Fig. 1 is a block diagram of the present utility model.
Fig. 2 is a power circuit diagram.
Fig. 3 is a subcarrier frequecy modulation device 1, video processor 3, the schematic diagram of mixer 2 and baseband amplifier 4.
Fig. 4 sends out the schematic diagram of device 6 for modulator 5 and light.
Fig. 5 receives device 8, demodulator 9 schematic diagrams for light.
Fig. 6 is splitter 10 and video processor 12 schematic diagrams.
Fig. 7 is subcarrier demodulator 11 schematic diagrams.
The following is embodiment of the present utility model:
1, the audio frequency of posting a letter is logical powerful
The two-way audio signal is respectively from A1 and the input of A2 port, audio preemphasis circuit through R2, C1 and R19, C13 composition, the high-end frequency of audio signal is promoted, carry out the frequency modulation modulation respectively to IC1 and IC2, adjusting T1 or T2, to make modulating subcarrier be 7MHz or 8MHz.Modulated audio sub-carrier signal amplifies through Q1, Q2 and Q3, Q4 amplifier, is mixed into the baseband signal of audio sub-carrier then, to the band pass filter of being made up of L1-L7 and C23-C35, forms modulating baseband signal with vision signal again.
2, signalling video channel
Colour TV signal is from VIN port input, and the low pass filter of forming through T3-T5 and C49-C52 mixes through the mixer of R39-R41 with modulated audio sub-carrier signal, delivers to the amplification of IC3 integrated circuit, and exports baseband processor to through Q6, Q7 emitter follower.
3, the voltage-controlled frequency interleaved modulation modulator of PFM
The audio frequency and video baseband signal is delivered to 2 pin of IC1 by C1, and IC4 is voltage-controlled multivibrator, and baseband signal is by the voltage-controlled FM signal that is modulated to 30MHz of PFM.The characteristics of this circuit are: the voltage-frequency good linearity, and the frequency of oscillation height, and adjust easily.IC5 is a temperature-compensation circuit.Modulated signal is through the output of Q2 emitter follower, and Q5, Q6 form a promotion level amplifier, and modulated signal is amplified to is enough to promote optical transmitting set.
4, the light Power Generation Road
This light-emitting tube power output is 400 μ W, and wavelength is 1280-1330nm, adopts strained multiple-quantum-well structure laser tube core, good temp characteristic, and when 25-65 ℃ of temperature, optical power change is less than 2dB.The modulated signal of telecommunication is sent into the luminous device of penetrating and carried out electro-optical conversion, and is last, exports by light bump joint to optical fiber.
(2) collection of letters terminal
1, light collection of letters circuit
Modulated light signal imports collection of letters terminal into by long-distance optical fiber, and carrying out opto-electronic conversion through optical fiber receive module OP is the faint signal of telecommunication, and is amplified by the low noise amplifier of inside, is coupled to the PFM FM demodulator through C2.Optical fiber receive module can work in 1100-1650nm.Have functions such as automatic gain control and wide dynamic range, GaAs is arranged, IcAGC transimpedance amplifying circuit, working temperature is-20～+ 70 ℃.
2, the PFM FM demodulator
The PFM FM demodulator is made up of the IC7-IC11 integrated circuit, and it is reduced to baseband signal with modulated signal, and D1～D3 and Q5 form the reception indicating circuit, and whether the display light signal is received.Baseband signal after the demodulation is by L6～C8, and the low pass filter that C16～C19 forms is delivered to the 1C12 baseband amplifier with the elimination of high frequency noise jamming aliquot by C20.Baseband signal is divided into two-way by Q1, Q3 and Q2, Q4 emitter follower with the base band amplifying signal, and promptly audio base-band and video base band are delivered to picture processing path and Audio Processing passage respectively.
3, collection of letters video processing circuits
Be coupled to IC15 from the baseband signal of PFM demodulator output through C1, this baseband signal is amplified to Q1, Q2 emitter follower through the IC15 baseband amplifier, and T1～T3, and the low pass filter that C11～C17 forms obtains vision signal.Vision signal is amplified by the IC16 video amplifier again, is divided into two-way, behind Q6, Q7 and Q8, Q9 emitter follower, respectively from V10UT and 20UT output.
4, collection of letters audio frequency processing circuit
Form high pass filter from the baseband signal of PFM demodulator output through C1～C4, L1～L5, with the vision signal filtering, audio baseband signal is amplified through Q1, Q2 amplifier, and is divided into two-way, i.e. 7MHz and 8MHz subcarrier circuit.
7MHz band pass filter that audio baseband signal is formed to C5～C21, T1～T5 through the Q3 emitter follower and Q5, Q6 amplifier, obtain the 7MHz baseband signal, through the voltage-controlled FM demodulator of IC17, from P14 pin output audio signal, audio signal, is exported from the A1/OUT port to the IC2 audio frequency amplifier at last through the Q7 emitter follower.
Equally, 8MHz band pass filter that audio baseband signal is formed through Q4 to C64～C72, T6～T10 and Q9, Q10 amplifier are obtained the 8MHz baseband signal, through the voltage-controlled FM demodulator of IC19 from P14 pin output audio signal.Through the Q8 emitter follower to the IC20 amplifier.Audio signal is amplified, export another road audio signal from the P1 pin of IC4.
(3) power supply
PFM2000 optical fiber transceiver terminal all adopts AC220V, the 50Hz Alternating Current Power Supply, and rectification in the transceiver terminal, filtering and voltage stabilizing are exported respectively ± 12V, and-8V DC power supply is supplied with and is respectively given circuit.
Transceiver terminal power consumption is less than 30VA.
Claims (10)
1, a kind of light is received, the terminal of posting a letter, it is characterized in that audio signal is respectively from A1 and A2 port input subcarrier frequecy modulation device (1), the output of subcarrier frequecy modulation device (1) connects the input of mixer (2), vision signal is from V port input video processor (3), the output of video processor (3) connects the input of mixer (2), the output of closing road circuit (2) connects the input of baseband amplifier (4), the output of baseband amplifier (4) connects the input of PFM modulator (5), the output of PFM modulator (5) connects the input that light is sent out device (6), the output that light is sent out device (6) connects the input that light is received device (8) through optical cable (7), the output of light receipts devices (8) connects the input of PFM demodulator (9), the output of demodulator (9) connects the input of splitter (10), one tunnel output of splitter (10) connects subcarrier demodulator (11), and another road output of splitter (10) connects the input of video processor (12).
2, optical receiving and transmitting terminal facility according to claim 1, it is characterized in that the audio preemphasis circuit that the input of subcarrier frequecy modulation device (1) is made up of R2, C1 and R19, C13, its output connects 14 pin of ic chip 1 and IC2, inductance T1, T2 is connected between IC1 and IC2 and 2,3 pin, IC1, the output of IC2 connects the amplifier in that transistor Q1, Q2 and Q3, Q4 form through 13 pin, and amplifier out connects the mixer (2) that R39-R41 forms through band pass filter.
3, optical receiving and transmitting terminal facility according to claim 1, it is characterized in that said video processor (3) is a low pass filter, its output connects the mixer (2) that R39-R41 forms, mixer output connects amplifier (4), amplifier (4) is IC3, and the output of IC3 connects modulator-demodulator from 7 pin through emitter follower.
4, optical receiving and transmitting terminal facility according to claim 1, it is characterized in that said PFM modulator is the voltage-controlled multivibrator IC4 of integrated circuit, its 2 pin is an input, they are 4 years old, 6 pin connect 3 pin and 4 pin of integrated temperature compensating circuit IC5, its 6 pin connects the Q2 emitter follower, and the output of Q2 connects light and sends out device (6) through amplifier Q5 behind the Q6.
5, optical receiving and transmitting terminal facility according to claim 1 is characterized in that said light sends out device (6) and send ic chip 6 by light and form, and 9 pin of IC6 connect the collector electrode of Q5 and Q6, connect the base stage of Q7.
6, receive according to claim 1 or 2 or 3 or 4 or 5 described light, the terminal of posting a letter, it is characterized in that light sends out the light signal that device sends and enter light-receiving integrated package OP through optical fiber (7), be coupled to PFM FM demodulator (39) from the 4 foot meridian capacitor C2 of OP, FM demodulator (9) is made up of ic chip 7-IC11, the output of FM demodulator (9) from 13 pin of IC11 behind low pass filter, deliver to 1 pin of IC12 baseband amplifier by C20,7 of IC12,8 pin can be crossed Q2, Q4 and Q1, the Q3 emitter follower, baseband signal is divided into two-way, 4 of IC7,5,6 pin meet diode D1-D3, the reception indicating circuit that transistor and light-emitting diode D4 form.
7, according to claim 1 or 2 or 3 or 4 or 5 described optical receiving and transmitting terminal facilities, the output that it is characterized in that splitter (1D) is through being capacitively coupled to 1 pin of IC15, the 8 pin output of IC15 obtains vision signal through emitter follower and low pass filter, vision signal is imported 1 pin of IC16 amplifier again, export from 8 pin, respectively behind Q6, Q7 and Q8, Q9 emitter follower, respectively from V10UT and V20UT output.
8, according to claim 1 or 2 or 3 or 4 or 5 described optical receiving and transmitting terminal facilities, it is characterized in that baseband signal from PFM demodulator (9) output through high pass filter with the vision signal filtering, audio baseband signal is amplified through amplifier, and is divided into A1, A2 two-way subcarrier circuit.
9, optical receiving and transmitting terminal facility according to claim 8, it is characterized in that said A1, the A2 two paths of signals is respectively through band pass filter, amplifier is again through IC17, the voltage-controlled FM demodulator of IC19, from 14 pin output audio signals, audio signal is through emitter follower and IC18, the IC20 audio frequency amplifier is from A1/OUT and A2/OUT output.
10, according to claim 2 or 3 or 4 or 5 or 9 described optical receiving and transmitting terminal facilities, it is characterized in that said IC1 and IC2 are MC1374, IC3 is NE592, IC4 is MC1648AP, and IC5 is LM358, and IC6 is LDM354SS, OP is PFWM921, and 1C7 and 1C8 are MC10116, and IC9 and IC10 are MC10107, IC11 is MC10125, IC12, IC15, IC16 are NE592, IC17 and IC19 are NE564, and IC18 and IC20 are LM358.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN00245224U CN2456379Y (en) | 2000-12-07 | 2000-12-07 | Optical receiving and transmitting terminal facility |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN00245224U CN2456379Y (en) | 2000-12-07 | 2000-12-07 | Optical receiving and transmitting terminal facility |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2456379Y true CN2456379Y (en) | 2001-10-24 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN00245224U Expired - Fee Related CN2456379Y (en) | 2000-12-07 | 2000-12-07 | Optical receiving and transmitting terminal facility |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2456379Y (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101895357A (en) * | 2010-07-12 | 2010-11-24 | 上海新干通通信设备有限公司 | Multi-frequency frequency modulation broadcast system capable of switching in critical alarm speech signal |
| CN101233705B (en) * | 2006-05-12 | 2011-12-14 | 吉加塞特通信有限责任公司 | Device and method for sending optical transmission data through wireless aerial |
| CN102624477A (en) * | 2012-03-22 | 2012-08-01 | 北京恒星科通科技发展有限公司 | Optical fiber synchronous broadcasting system and method |
| CN103001698A (en) * | 2012-09-29 | 2013-03-27 | 吉视传媒股份有限公司 | Optical transmission system |
| CN103595474A (en) * | 2013-11-12 | 2014-02-19 | 宁波环球广电科技有限公司 | Node device for optical fiber radio frequency transmission |
| CN104683033A (en) * | 2013-11-28 | 2015-06-03 | 哈尔滨市三和佳美科技发展有限公司 | Bidirectional remote laser communication apparatus |
-
2000
- 2000-12-07 CN CN00245224U patent/CN2456379Y/en not_active Expired - Fee Related
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101233705B (en) * | 2006-05-12 | 2011-12-14 | 吉加塞特通信有限责任公司 | Device and method for sending optical transmission data through wireless aerial |
| CN101895357A (en) * | 2010-07-12 | 2010-11-24 | 上海新干通通信设备有限公司 | Multi-frequency frequency modulation broadcast system capable of switching in critical alarm speech signal |
| CN102624477A (en) * | 2012-03-22 | 2012-08-01 | 北京恒星科通科技发展有限公司 | Optical fiber synchronous broadcasting system and method |
| CN103001698A (en) * | 2012-09-29 | 2013-03-27 | 吉视传媒股份有限公司 | Optical transmission system |
| CN103001698B (en) * | 2012-09-29 | 2018-02-13 | 北京吉视汇通科技有限责任公司 | Optical transmission system |
| CN103595474A (en) * | 2013-11-12 | 2014-02-19 | 宁波环球广电科技有限公司 | Node device for optical fiber radio frequency transmission |
| CN103595474B (en) * | 2013-11-12 | 2015-11-11 | 宁波环球广电科技有限公司 | Node device for optical fiber radio frequency transmission |
| CN104683033A (en) * | 2013-11-28 | 2015-06-03 | 哈尔滨市三和佳美科技发展有限公司 | Bidirectional remote laser communication apparatus |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |