CN203801012U - Photoemissive transmitter for cable television system - Google Patents
Photoemissive transmitter for cable television system Download PDFInfo
- Publication number
- CN203801012U CN203801012U CN201420153105.6U CN201420153105U CN203801012U CN 203801012 U CN203801012 U CN 203801012U CN 201420153105 U CN201420153105 U CN 201420153105U CN 203801012 U CN203801012 U CN 203801012U
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- China
- Prior art keywords
- signal
- module
- laser
- television system
- cable television
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Abstract
The utility model relates to a cable television system, in particular, a photoemissive transmitter for a cable television system. The photoemissive transmitter includes a radio frequency signal input end, a signal attenuation adjustment module, a signal pre-distortion calibration module, a laser and a microprocessor; the laser is connected with an optical signal output end; and a radio frequency signal input end is connected with a radio frequency signal pre-amplifying circuit, the signal attenuation adjustment module, a power amplification circuit, the signal pre-distortion calibration module and the laser sequentially. According to the photoemissive transmitter for the cable television system provided by the utility model, radio frequency signal amplification, excitation and pre-distortion calibration can be realized through the signal attenuation adjustment module, the signal pre-distortion calibration module and a gain control module, and therefore, problems of signal distortion and incapability of satisfying long-distance transmission in the operating process of the cable television system can be solved.
Description
Technical field
The utility model relates to a kind of cable television system, relates in particular to a kind of light for cable television system and penetrates transmitter.
Background technology
Traditional Cable TV Signal Transmission is mainly to take RF-wise as main, and this mode is only suitable for short range transmission, and signal when transmission exchanges data speed is low, less stable.At present, the application of Optical Fiber Transmission is more and more extensive, and Optical Transport of CATV Signals rate into family is also more and more higher, adopts light to penetrate transmitter and carries out signal transmission, has solved classical signal transmission means distorted signals and cannot meet the defect of remote transmission.
Summary of the invention
The utility model can only closely transmit and exist that exchanges data speed is low in traditional Cable TV Signal Transmission process for prior art, the shortcoming of less stable, distorted signals etc., provides a kind of and has had distorted signals and proofread and correct and can meet the remote light for cable television system transmitting of signal and penetrate transmitter.
In order to solve the problems of the technologies described above, the utility model is solved by following technical proposals:
A kind of light for cable television system is penetrated transmitter, comprise radio-frequency (RF) signal input end, signal attenuation adjustment module, signal predistortion correction module, laser and the microprocessor being connected with laser, laser also connects light signal output end, radio-frequency (RF) signal input end connects radiofrequency signal pre-amplification circuit, signal attenuation adjustment module, power amplification circuit, signal predistortion correction module and laser successively: between radiofrequency signal pre-amplification circuit, signal attenuation adjustment module, also connect the first coupler, be also connected with radiofrequency signal tester on the first coupler; Between power amplification circuit and signal predistortion correction module, be also connected with the second coupler, between signal attenuation adjustment module and the second coupler, be connected with gain control module; Between laser and microprocessor, be also connected with the automatic power control module and the automatic temperature-adjusting control module that are in parallel.
After radiofrequency signal input optical sender, first through radiofrequency signal prime amplifier, radiofrequency signal is carried out to pre-amplification, signal after pre-amplification carries out radiofrequency signal power amplification by power amplifier again, by gain control module, signal is processed again, then pass through signal compensation and the corrective action of predistortion correction module, finally deliver to laser and be converted to light signal output., be connected with laser and the automatic power control module and the automatic temperature-adjusting control module that are connected in parallel are mutually controlled and regulate the power of laser and temperature, to guarantee job stability and the reliability of laser meanwhile.
As preferably, gain control module comprises automatic gain control circuit and/or manual gain control circuit, by automatic gain control circuit and/or the manual gain control circuit that can freely switch, signal is processed.
As preferably, on microprocessor, be provided with RS485 interface, control panel and display screen, signal and data can, from the input and output of RS232 interface, can be adjusted by control panel the signal condition parameter of optical sender input and output, and can show by display screen.
The utility model is owing to having adopted above technical scheme, there is significant technique effect: adopt light to penetrate transmitter, by signal attenuation adjustment module, signal predistortion correction module and gain control module, realize radiofrequency signal amplification, excitation and predistortion correction, effectively solved distorted signals in cable television system running and cannot meet the problem of remote transmission.
Accompanying drawing explanation
Fig. 1 is the operation principle block diagram of the utility model embodiment.
The toponym that in accompanying drawing, each number designation refers to is as follows: 1-light signal output end wherein, 2-automatic power control module, 3-automatic temperature-adjusting control module, 4-laser, 5-signal predistortion correction module, 6-power amplification circuit, 7-signal attenuation adjustment module, 8-radiofrequency signal pre-amplification circuit, 9-radio-frequency (RF) signal input end, 10-radiofrequency signal tester, the 11-the first coupler, 12-gain control module, the 13-the second coupler, 14-control panel, 15-RS485 interface, 16-display screen, 17-microprocessor, 121-automatic gain control circuit, 122-manual gain control circuit.
Embodiment
Below in conjunction with accompanying drawing and embodiment, the utility model is described in further detail.
Embodiment 1
A kind of light for cable television system is penetrated transmitter, as shown in Figure 1, comprise radio-frequency (RF) signal input end 9, signal attenuation adjustment module 7, signal predistortion correction module 5, laser 4 and the microprocessor 17 being connected with laser 4, laser 4 also connects light signal output end 1, and radio-frequency (RF) signal input end 9 connects radiofrequency signal pre-amplification circuit 8, signal attenuation adjustment module 7, power amplification circuit 6, signal predistortion correction module 5 and laser 4 successively; Between radiofrequency signal pre-amplification circuit 8, signal attenuation adjustment module 7, also connect on the first coupler 11, the first couplers 11 and be also connected with radiofrequency signal tester 10; Between power amplification circuit 6 and signal predistortion correction module 5, be also connected with the second coupler 13, between signal attenuation adjustment module 7 and the second coupler 13, be connected with gain control module 12, between laser 4 and microprocessor 17, be also connected with the automatic power control module 2 and the automatic temperature-adjusting control module 3 that are in parallel, on microprocessor 17, be provided with RS485 interface 15, control panel 14 and display screen 16.
In the present embodiment, gain control module 12 also comprises automatic gain control circuit 121 and manual gain control circuit 122, and certainly gain control module 12 only comprises that automatic gain control circuit 121 or manual gain control circuit 122 also can.
Radiofrequency signal is from radio-frequency (RF) signal input end 9 input optical senders, first through 8 pairs of radiofrequency signals of radiofrequency signal pre-amplification circuit, carry out pre-amplification, signal after pre-amplification carries out radiofrequency signal power amplification by power amplification circuit 6 again, by the automatic gain control circuit 121 in gain control module 12 and/or 122 pairs of signals of manual gain control circuit, process again, then pass through signal compensation and the corrective action of signal predistortion correction module 5, finally deliver to laser 4 and be converted to light signal from light signal output end 1 output., be connected with laser 4 and the automatic power control module 2 that is connected in parallel mutually and power and the temperature of 3 pairs of lasers 4 of automatic temperature-adjusting control module are controlled and regulate, to guarantee job stability and the reliability of laser 4 meanwhile.Signal and data can, from 15 input and output of RS232 interface, can be adjusted the signal condition parameter of optical sender input and output by control panel 14, and can show by display screen 16.
In a word, the foregoing is only preferred embodiment of the present utility model, all equalizations of doing according to the utility model claim change and modify, and all should belong to the covering scope of the utility model patent.
Claims (3)
1. the light for cable television system is penetrated transmitter, comprise radio-frequency (RF) signal input end (9), laser (4) and the microprocessor (17) being connected with laser (4), laser (4) also connects light signal output end (1), it is characterized in that: also comprise signal attenuation adjustment module (7), signal predistortion correction module (5), radiofrequency signal pre-amplification circuit (8) and power amplification circuit (6); Radio-frequency (RF) signal input end (9) connects radiofrequency signal pre-amplification circuit (8), signal attenuation adjustment module (7), power amplification circuit (6), signal predistortion correction module (5) and laser (4) successively, between radiofrequency signal pre-amplification circuit (8), signal attenuation adjustment module (7), also connect the first coupler (11), on the first coupler (11), be also connected with radiofrequency signal tester (10); Between power amplification circuit (6) and signal predistortion correction module (5), be also connected with the second coupler (13), between signal attenuation adjustment module (7) and the second coupler (13), be connected with gain control module (12); Between laser (4) and microprocessor (17), be also connected with the automatic power control module (2) and the automatic temperature-adjusting control module (3) that are in parallel.
2. a kind of light for cable television system according to claim 1 is penetrated transmitter, it is characterized in that: gain control module (12) comprises automatic gain control circuit (121) and/or manual gain control circuit (122).
3. a kind of light for cable television system according to claim 1 is penetrated transmitter, it is characterized in that: on microprocessor (17), be provided with RS485(15), control panel (14) and display screen (16) interface.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420153105.6U CN203801012U (en) | 2014-03-31 | 2014-03-31 | Photoemissive transmitter for cable television system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420153105.6U CN203801012U (en) | 2014-03-31 | 2014-03-31 | Photoemissive transmitter for cable television system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203801012U true CN203801012U (en) | 2014-08-27 |
Family
ID=51383196
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420153105.6U Expired - Fee Related CN203801012U (en) | 2014-03-31 | 2014-03-31 | Photoemissive transmitter for cable television system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203801012U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105245285A (en) * | 2015-09-24 | 2016-01-13 | 江苏阿尔特光电科技有限公司 | Laser transmitter |
| CN106597346A (en) * | 2016-12-08 | 2017-04-26 | 中国电力科学研究院 | Electronic current transformer laser energy supply self-diagnosis method and system thereof |
| CN108377168A (en) * | 2018-01-02 | 2018-08-07 | 杭州万隆光电设备股份有限公司 | A kind of optical sender |
-
2014
- 2014-03-31 CN CN201420153105.6U patent/CN203801012U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105245285A (en) * | 2015-09-24 | 2016-01-13 | 江苏阿尔特光电科技有限公司 | Laser transmitter |
| CN106597346A (en) * | 2016-12-08 | 2017-04-26 | 中国电力科学研究院 | Electronic current transformer laser energy supply self-diagnosis method and system thereof |
| CN108377168A (en) * | 2018-01-02 | 2018-08-07 | 杭州万隆光电设备股份有限公司 | A kind of optical sender |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20140827 Termination date: 20190331 |