CN201515468U - Laser receiving and transmitting integral machine - Google Patents
Laser receiving and transmitting integral machine Download PDFInfo
- Publication number
- CN201515468U CN201515468U CN2009203100222U CN200920310022U CN201515468U CN 201515468 U CN201515468 U CN 201515468U CN 2009203100222 U CN2009203100222 U CN 2009203100222U CN 200920310022 U CN200920310022 U CN 200920310022U CN 201515468 U CN201515468 U CN 201515468U
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- laser
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Abstract
The utility model discloses a laser receiving and transmitting integral machine which comprises an optical receiving system and an optical transmitting system; the optical receiving system comprises an optical detector, an input amplifying circuit, a control circuit and an output amplifying circuit, which are connected in sequence, wherein an optical signal is converted into an electrical signal through the optical detector, after being amplified by the input amplifying circuit, the electrical signal passes through the control circuit, an electric control attenuator and the output amplifying circuit and then is divided into two paths of signals through an allocator to access to a user; and the optical transmitting system comprises a radio frequency exciting circuit, a predistortion circuit and a laser, which are connected in sequence, a radio frequency signal accesses to the radio frequency exciting circuit and then accesses to the laser through the predistortion circuit for modulation, and the modulated laser is transmitted through an optical fiber. The laser receiving and transmitting integral machine has the advantages that the laser receiving and transmitting integral machine has the functions of the amplitude-modulation laser transmitter and the amplitude-modulation laser receiver for a cable television system, can fully utilize the prior back-up optical fiber for the hybrid fiber and coax network to return the uplink signal and is convenient and practical.
Description
Technical field
The utility model relates to a kind of cable television system optical transmission device, especially relates to a kind of laser transmitting-receiving all-in-one of cable television system.
Background technology
Normal optical equipment only has the unit single-shot or the unit list is received function.And the electric conversion performance of common photoelectric pipe receiver is inaccurate, and linear reducing property is bad; Can not low-power receiving, signal is lower than-will produce serious distortion, the problem that can not watch during 3dB; Because use general module to amplify, its caloric value is huge, and the useful life of complete machine and stability in use are affected; Since adopt conventional attenuator, the spoilage height, and also adjusting all will be opened cover at every turn, makes network operation become complicated; Owing to be built-in power, so when power supply damages, must the complete machine maintenance.
The light emission system efficient of traditional laser transmitting-receiving all-in-one is lower, and stability is not high, and has strong noise, signal quality deteriorates after the secondary light modulation; Signal receiving and transmitting system can not separate processes, thereby can have influence on the RF level of downlink optical signal when regulating output level; Local insertion signal can transmit the signal that gets off to front end and cause disturb worsens.
The utility model content
The utility model has overcome shortcoming of the prior art, a kind of convenience, the laser transmitter via amplitude modulation with cable television system of practicality and the laser transmitting-receiving all-in-one of amplitude modulation laser receiver function are provided, can make full use of the existing backup optical fiber of Hybrid Fiber and Coax Network HFC (HFC) passback upward signal, dexterously laser transmission technology and laser pick-off technology being melted is in the equipment.
The technical solution of the utility model is: a kind of laser transmitting-receiving all-in-one, comprise light transmission/reception system and light emission system, described optical receiver system is connected successively by photodetector, input amplifying circuit, control circuit and output amplifier, light signal changes the signal of telecommunication into through photodetector, after input amplifying circuit amplifies, again through control circuit after electricity is transferred decay, be assigned with device through output amplifier and be divided into two paths of signals and enter the user; Described light emission system is connected successively by RF excited circuit, predistortion circuit and laser, and radiofrequency signal enters the RF excited circuit, enters laser through predistortion circuit again and modulates, and the laser that modulates sends by optical fiber.
In the inside of described laser ATC circuit and biasing circuit are arranged.
Between described predistortion circuit and laser microprocessor is set, described microprocessor links to each other with the LD LCD.
Described photodetector is connected to display circuit and power supply adaptor respectively.
In described optical receiver system, also be provided with a plurality of adjustment devices.
Compared with prior art, the utility model has the advantages that:
1, the optical receiver system that has high-technology index guarantees that the technical indicator in continuing transmission course is good.
2, have the signal that front end is received and carry out laser amplitude modulation once more, continue to transmit, can make the light contact become a signal relay station thereby make the RF signal become light signal, make under effective acceptable conditions, the RF signal transmits fartherly, and index technology at different levels is good, can guarantee that the user normally watches.
3, have multi-functional local signal insertion system, local signal is inserted in the front end signal transmits, and transmit and also can in light emission system, transmit in this machine RF output.
4, light emission system efficient is higher, the stability height, and have high broadband, and low noise, characteristics such as low mutual accent have fundamentally solved the signal quality deteriorates problem that the secondary light modulation brings.
Though it is 5, signal receiving and transmitting system is that a passage but is a separate processes, constant thereby assurance does not influence the RF level of downlink optical signal when allowing this machine of adjusting output level.
6, the high mixting circuit of isolating of local insertion system employing makes local insertion signal can not transmit the signal that gets off to front end and causes disturb worsens.
Description of drawings
The utility model will illustrate by example and with reference to the mode of accompanying drawing, wherein:
Fig. 1 is a signal flow schematic diagram of the present utility model.
Embodiment
Disclosed all features in this specification, or the step in disclosed all methods or the process except mutually exclusive feature and/or step, all can make up by any way.
Disclosed arbitrary feature in this specification (comprising any accessory claim, summary and accompanying drawing) is unless special narration all can be replaced by other equivalences or the alternative features with similar purpose.That is, unless special narration, each feature is an example in a series of equivalences or the similar characteristics.
As shown in Figure 1, a kind of laser transmitting-receiving all-in-one comprises light transmission/reception system and light emission system.
Optical receiver system comprises photodetector, input amplifying circuit, control circuit, output amplifier, display circuit and power circuit.Be transformed into the photodetector of optical receiver through ring flange by the light signal of stern fast input, it is photodiode, change light signal into the signal of telecommunication, enter pre-amplification circuit through electric coupling, amplifying signal passes through electrically controlled attenuator again, be assigned with device through two-stage amplification later and be divided into two paths of signals, enter the user.Display circuit can show the luminous power of receiver.Power supply adaptor is mainly complete machine DC power supply is provided.Also be provided with a plurality of adjustment devices in optical receiver system, can adjust flexibly according to user's needs, wherein return local RF input port bandwidth (or selected by the user), the user can carry out more service items.
Light emission system comprises: RF excited circuit, predistortion circuit, laser have ATC circuit and biasing circuit in the inside of laser.At first the RF signal enters the RF excited circuit, enters laser through predistortion circuit again and modulates, and the laser that modulates sends by optical fiber.Automatic APC (automated power control) is arranged in the inside of laser, automatic ATC (automatic temperature-adjusting control), this circuit has accurate biasing circuit, makes the luminous power of output constant.Microprocessor is set between predistortion circuit and laser carries out real-time monitoring management, indexs such as digital display light power, bias current, operating voltage, cooling and warming electric current, the indication of reporting to the police on the liquid crystal display screen, and adjust state neatly, make Laser emission be in optimum state.
The CATV system that the utility model also is provided with the level detecting mouth of panel, RF delivery outlet that the light radiating portion is used, branching networks center (or secondary station) manages program (or increasing program) input port etc. by oneself, can realize uploading and passing down of various signals easily.
Operation principle of the present utility model is:
1, front end send here after effectively receiving optical signals enters the laser transmitting-receiving all-in-one, receive and convert to the RF signal by optical receiver systems, mix generation RF composite signal with local signal through the preposition signal inserter that is amplified into.
2, the RF signal that has inserted local signal is divided into two-way, and one the tunnel is sent by optical receiver after amplifying, and another road enters light emission module and carries out continuing descending transmission again after the amplitude modulation once more.
The above only is preferred embodiment of the present utility model; not in order to restriction the utility model; all any modifications of within spirit of the present utility model and principle, being done, be equal to and replace and improvement etc., all should be included within the protection range of the present utility model.
Claims (5)
1. laser transmitting-receiving all-in-one, it is characterized in that: comprise light transmission/reception system and light emission system, described optical receiver system is connected successively by photodetector, input amplifying circuit, control circuit and output amplifier, light signal changes the signal of telecommunication into through photodetector, after input amplifying circuit amplifies, again through control circuit after electricity is transferred decay, be assigned with device through output amplifier and be divided into two paths of signals and enter the user; Described light emission system is connected successively by RF excited circuit, predistortion circuit and laser, and radiofrequency signal enters the RF excited circuit, enters laser through predistortion circuit again and modulates, and the laser that modulates sends by optical fiber.
2. laser transmitting-receiving all-in-one according to claim 1 is characterized in that: in the inside of described laser ATC circuit and biasing circuit are arranged.
3. laser transmitting-receiving all-in-one according to claim 1 is characterized in that: between described predistortion circuit and laser microprocessor is set, described microprocessor links to each other with the LD LCD.
4. laser transmitting-receiving all-in-one according to claim 1 is characterized in that: described photodetector is connected to display circuit and power supply adaptor respectively.
5. laser transmitting-receiving all-in-one according to claim 1 is characterized in that: also be provided with a plurality of adjustment devices in described optical receiver system.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009203100222U CN201515468U (en) | 2009-09-09 | 2009-09-09 | Laser receiving and transmitting integral machine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009203100222U CN201515468U (en) | 2009-09-09 | 2009-09-09 | Laser receiving and transmitting integral machine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201515468U true CN201515468U (en) | 2010-06-23 |
Family
ID=42486879
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2009203100222U Expired - Fee Related CN201515468U (en) | 2009-09-09 | 2009-09-09 | Laser receiving and transmitting integral machine |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201515468U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102386979A (en) * | 2011-10-26 | 2012-03-21 | 常熟市高事达光电科技有限公司 | Optical receiver uplink laser control circuit transformed by wired television bilateral network |
| CN102831367A (en) * | 2012-06-25 | 2012-12-19 | 深圳市捷顺科技实业股份有限公司 | Radio frequency identification device and radio frequency identification system |
| CN103516432A (en) * | 2012-06-25 | 2014-01-15 | 杭州通兴电子有限公司 | Continuous optical receiver |
-
2009
- 2009-09-09 CN CN2009203100222U patent/CN201515468U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102386979A (en) * | 2011-10-26 | 2012-03-21 | 常熟市高事达光电科技有限公司 | Optical receiver uplink laser control circuit transformed by wired television bilateral network |
| CN102386979B (en) * | 2011-10-26 | 2012-11-21 | 常熟市高事达光电科技有限公司 | Optical receiver uplink laser control circuit transformed by wired television bilateral network |
| CN102831367A (en) * | 2012-06-25 | 2012-12-19 | 深圳市捷顺科技实业股份有限公司 | Radio frequency identification device and radio frequency identification system |
| CN103516432A (en) * | 2012-06-25 | 2014-01-15 | 杭州通兴电子有限公司 | Continuous optical receiver |
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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 |
Granted publication date: 20100623 Termination date: 20150909 |
|
| EXPY | Termination of patent right or utility model |