CN203775344U - Bidirectional optical workstation with optical AGC function - Google Patents
Bidirectional optical workstation with optical AGC function Download PDFInfo
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- CN203775344U CN203775344U CN201420036235.1U CN201420036235U CN203775344U CN 203775344 U CN203775344 U CN 203775344U CN 201420036235 U CN201420036235 U CN 201420036235U CN 203775344 U CN203775344 U CN 203775344U
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Abstract
The utility model discloses a bidirectional optical workstation with an optical AGC function. The bidirectional optical workstation comprises a dual-path light receiving unit and a dual-path back-pass light emitting unit which are integrally arranged in a machine body, wherein each of the dual-path light receiving unit and the dual-path back-pass light emitting unit can be divided into a main path unit and a backup unit. The dual-path light receiving unit has an automatic optical AGC function, can maintain the constant output of output level of the optical workstation within the range of input optical power from minus 9 to 0 dBm, enables the user to watch television images normally and guarantees the image quality under the situation that ultra low light power is adopted in some places at remote towns and villages and urban suburbs, and solves the problem of large loss of output level in transmission. The working voltage of the machine body ranges from AC35 to 265V, each port of the machine body is additionally provided with a lightning protection tube for protection against lightning. The working power supply comprises a low-voltage feedback current with the voltage range from 35 to 95V, and the mains power supply with the voltage range from 110 to 265V, the lightning-proof power supply ensures that the normal operation of the workstation is not affected due to thunderstrike in field operation. Through the method, the bidirectional optical workstation integrates the light receiving technology and the back-pass light emitting technology in a cable television system optical workstation, increases functions of the cable television system optical workstation, simplifies the structure, reduces the cost, is more convenient to use, and has more stable safe reliability.
Description
Technical field
The utility model includes cable TV system optical transmission device field, and particularly the two-way light work-station of this money band light AGC function is a kind of requisite transmission equipment.
Background technology
With the two-way light work-station of light AGC function, refer to the TV signal of major network by after Optical Fiber Transmission, light signal is converted to radiofrequency signal, be then assigned in a net and go.
Traditional CATV broadcast allocation net, the transformation of the hybrid network (being hfc plant) combining along with optical fiber and coaxial cable, to the two-way mutual net development of communication formula, fiber optic network and passive cable distribution network are by the dominant pattern that is hfc plant framework.
The target of HFC is exactly to become to provide for Huo Zhe city, this area the wideband multimedia communications platform of much information business service; From current hfc plant developing state, there is obvious feature: optical fiber progressively extends to user, the service radius of light contact is more and more less, Double-Direction User increases gradually, the application of RF amplifier is fewer and feweri, generally also just use in secondary, the later network reliability of light contact is greatly improved.
Along with the raising of user to quality of service requirement, light contact is passive distribution network the most at last, does not adopt RF amplifier, only by optical receiving device, provides high level output signal, covers node user around.Now require equipment under adverse circumstances or luminous power is caused while changing by other factors, guarantee to remain that output level that high target is constant, to user side, can normally teleview.
Summary of the invention
The technical problem that the utility model mainly solves is to provide a kind of two-way light work-station with light AGC function, can be when input optical power be-9～0dBm variation, and the output level of descending light receiving unit is invariable all the time.Up passback Optical Transmit Unit, under the effect of two-stage anti-jamming circuit, has well solved user when more, forms the problem of influx noise.
For overcoming the above problems, the utility model solves the technical scheme that its technical problem adopts and is: a kind of two-way light work-station with light AGC function is provided, comprises: body, two-way light receiving unit, two-way passback Optical Transmit Unit; Described two-way light receiving unit, two-way passback Optical Transmit Unit one are located in described body; Described light receiving unit input is by optical fiber incoming light signal, while having light signal to enter, each frequency modulated light power indicator light of have-9～0dBm of light receiving unit, and light signal is converted to radiofrequency signal, utilize the fast conducting principle of Schottky diode and the special processing on circuit, make the output level of optical workstation remain constant output, finally by the GaAs amplifier module output signal of high target to user side.Described passback Optical Transmit Unit passes through, after the interior two-stage low frequency anti-jamming circuit filtering low-frequency noise of machine, high-speed data signal to be modulated on low channel, and by Optical Fiber Transmission, to arrive the comprehensive bearer network of front end system unit.
In preferred embodiment of the utility model, the downlink radio-frequency signal that the radiofrequency signal of described light receiving unit output output is 87-1000MHz, up return path signal is 15-65MHz.In preferred embodiment of the utility model, the power of described light signal is-9～0dBm, and every frequency modulated light power all has the luminous indication of corresponding indicator light.
In preferred embodiment of the utility model, the described two-way light work-station with light AGC function, when input optical power is-9～0dBm, has output level and protects all the time special constant function.
In preferred embodiment of the utility model, described body operating voltage is AC35～265V, and body and power supply all have anti-lightning defencive function.
In preferred embodiment of the utility model, described body also comprises a network management interface, and network management interface is connected with passback Optical Transmit Unit with light receiving unit respectively, and complete monitoring is realized in two unit, easy to use, safe and reliable.
Be exactly in addition in of paramount importance embodiment of the utility model, the two-way light receiving unit of described body and two-way passback light bill unit are divided into main road unit and backup units, during normal use, it is main road unit, main road output level once forward declines or no-output, diverter switch in optical workstation can automatically switch in backup units, be convenient to TV signal and be not interrupted, keep continuous wave output; When the very large or unglazed power stage of optical power change appears in the main road Optical Transmit Unit of passback, in like manner the passback main path signal in optical workstation also can be switched to backup units.Exactly because have the existence of main road unit and backup units in optical workstation, thereby effectively guaranteed that the TV signal in use is not interrupted.
Accompanying drawing explanation
Fig. 1 is the theory diagram of two-way light work-station one preferred embodiment of the utility model band light AGC function:
Embodiment
Below in conjunction with accompanying drawing, preferred embodiment of the present utility model is described in detail, thereby so that advantage of the present utility model and feature are easier to be it will be appreciated by those skilled in the art that, protection range of the present utility model is made to more explicit defining.
Refer to Fig. 1, the utility model embodiment comprises:
A two-way light work-station with light AGC function, comprising: body, two-way light receiving unit, two-way passback Optical Transmit Unit, described two-way light receiving unit, two-way passback Optical Transmit Unit one are located in described body.
Described light receiving unit input is by optical fiber incoming light signal, while having light signal to enter, each frequency modulated light power indicator light of have-9～0dBm of light receiving unit, and light signal is converted to radiofrequency signal, finally by the GaAs amplifier module output signal of high target to user side.Described passback Optical Transmit Unit passes through, after the interior two-stage low frequency anti-jamming circuit filtering low-frequency noise of machine, high-speed data signal to be modulated on low channel, and by optical fiber, to pass to the comprehensive bearer network of front end system unit.
Light receiving unit is by optical fiber receiving optical signals, and the power of described light signal is at-9～0dBm.Light signal is converted to radiofrequency signal, exports the downstream signal that this radiofrequency signal is 87-1000MHz by described light receiving unit output.
The input power of described light signal is-9～0dBm, and every frequency modulated light power all has the luminous indication of corresponding indicator light.
The described two-way light work-station with light AGC function, when input optical power is-9～0dBm, has output level and protects all the time special constant function.
Described body operating voltage is that AC35～265V all has anti-lightning defencive function.
Described body also comprises a network management interface, and network management interface is connected with passback Optical Transmit Unit with light receiving unit respectively, and complete monitoring is realized in two unit, easy to use, safe and reliable.
The two-way light receiving unit of described body and two-way passback light bill unit are divided into main road unit and backup units, are main road unit, once the decline of main road output level or the no-output of forward, the diverter switch meeting in optical workstation while normally using
Automatically switch in backup units, be convenient to TV signal and be not interrupted, keep continuous wave output; When the very large or unglazed power stage of optical power change appears in the main road Optical Transmit Unit of passback, in like manner the passback main path signal in optical workstation also can be switched to backup units.Exactly because have the existence of main road unit and backup units in optical workstation, thereby effectively guaranteed that the TV signal in use is not interrupted.
The foregoing is only embodiment of the present utility model, not thereby limit the scope of the claims of the present utility model, every equivalent structure or conversion of equivalent flow process that utilizes the utility model explanation and accompanying drawing content to do, is directly or indirectly used in other
Relevant technical field, is all in like manner included in scope of patent protection of the present utility model.
Claims (7)
1. with a two-way light work-station for light AGC function, its feature comprises: body, two-way light receiving unit, two-way passback Optical Transmit Unit; Described two-way light receiving unit, two-way passback Optical Transmit Unit one are located in described body; Described light receiving unit input is by optical fiber incoming light signal, when having light signal input, each frequency modulated light power indicator light of have-9～0dBm of light receiving unit, and light signal is converted to radiofrequency signal, finally by the GaAs amplifier module outgoing television signal of high target to user side; Described passback Optical Transmit Unit passes through, after the two-stage low frequency anti-jamming circuit filtering low-frequency noise in machine, high-speed data signal to be modulated on low channel, and by Optical Fiber Transmission, to arrive the comprehensive bearer network of front end system unit.
2. the two-way light work-station with light AGC function according to claim 1, is characterized in that: the downlink radio-frequency signal that the radiofrequency signal of described light receiving unit output output is 87-1000MHz; The up radiofrequency signal that the radiofrequency signal of passback light bill unit is 15-65MHz.
3. the two-way light work-station with light AGC function according to claim 1, is characterized in that: the input optical power scope of described input optical signal is-9～0dBm, and every frequency modulated light power all has the luminous indication of corresponding indicator light.
4. the two-way light work-station with light AGC function according to claim 1, it is characterized in that: described two-way light work-station has automatic light AGC function, it can, in the scope of-9～0dBm input optical power, make the output level of optical workstation keep the function of constant output.
5. the two-way light work-station with light AGC function according to claim 1, is characterized in that: described body operating voltage is AC35～265V, and in body, every port is all added with anti-thunder tube, plays protection anti-lightning function; Working power comprises low pressure feedback electricity, and voltage range is 35-95V; Mains-supplied, voltage range is 110-265V, when anti-lightning power supply has guaranteed that work station is worked in the wild, avoids being struck by lightning and affects normal work.
6. the two-way light work-station with light AGC function according to claim 1, it is characterized in that: described body has network management interface, network management interface is connected with passback Optical Transmit Unit with light receiving unit respectively, complete monitoring can be realized in two unit, easy to use, safe and reliable.
7. the two-way light work-station with light AGC function according to claim 1, is characterized in that: described body comprises two-way light receiving unit and two-way passback Optical Transmit Unit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420036235.1U CN203775344U (en) | 2014-01-21 | 2014-01-21 | Bidirectional optical workstation with optical AGC function |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201420036235.1U CN203775344U (en) | 2014-01-21 | 2014-01-21 | Bidirectional optical workstation with optical AGC function |
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| CN203775344U true CN203775344U (en) | 2014-08-13 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201420036235.1U Expired - Fee Related CN203775344U (en) | 2014-01-21 | 2014-01-21 | Bidirectional optical workstation with optical AGC function |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104320639A (en) * | 2014-10-30 | 2015-01-28 | 成都康特电子高新科技有限责任公司 | Optical work station based on radio and television network system |
-
2014
- 2014-01-21 CN CN201420036235.1U patent/CN203775344U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104320639A (en) * | 2014-10-30 | 2015-01-28 | 成都康特电子高新科技有限责任公司 | Optical work station based on radio and television network system |
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| Date | Code | Title | Description |
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| 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: 20140813 Termination date: 20170121 |
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| CF01 | Termination of patent right due to non-payment of annual fee |