CN204316673U - Combination back transmission optical receiver - Google Patents
Combination back transmission optical receiver Download PDFInfo
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- CN204316673U CN204316673U CN201520061377.8U CN201520061377U CN204316673U CN 204316673 U CN204316673 U CN 204316673U CN 201520061377 U CN201520061377 U CN 201520061377U CN 204316673 U CN204316673 U CN 204316673U
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Abstract
The utility model proposes a kind of Combined back transmission optical receiver, it comprises radio frequency controlled switch S, described radio frequency controlled switch S has a radio-frequency (RF) output end OUT, multiple rf inputs and control end, described each rf inputs all connects a road optical receiving circuit, described every road optical receiving circuit includes power supply VCC, photodiode PD, resistance R, signal processing circuit A, splitter C, radio frequency amplifier AMP, radio-frequency probe RD and comparator P, the rf inputs of the output termination radio frequency controlled switch S of radio frequency amplifier AMP, the input of another output termination radio-frequency probe RD of described splitter C, an input of the output termination comparator P of described radio-frequency probe RD, another input termination threshold voltage input VREF of comparator P, the control end of the output termination radio frequency controlled switch S of comparator P.Adopt foregoing circuit can solve multi-path light receiver close road time, noise superposition problem and also take up room less.
Description
Technical field
The utility model relates to cable TV network technical field, is specifically a kind of Combined back transmission optical receiver.
Background technology
The application of cable TV (CATV) network is more and more diversified, and except increasing more digital television program, cable TV network can also provide more service, such as high-definition television programs, high speed data transfer, the networking telephone etc.Due to need provide so various and the demand for services of high power capacity and, along with user is to the demand undergoes rapid expansion of real time bidirectional interaction, catv network is towards the future development such as fiber to the home or fiber to the x, in the cable TV network of Optical Fiber Transmission, the demand for optical transceiver module or optical network unit is very huge.
Frequency range problem is obtained in order to solve cable TV network, be currently suggested radio frequency network on a kind of optical fiber (being called for short RFoG), it can be combined improve frequency range and upgrade flexibly with EPON well, and the basis not changing CATV main equipment realizes the FTTH-fiber to the home in user side meaning.On the optical station equipment of RFoG system, have multichannel back transmission optical receiver simultaneously, and only have on a road back transmission optical receiver at synchronization and have signal, owing to being that multichannel back transmission optical receiver works at present all simultaneously, so no matter Shi Na mono-road back transmission optical receiver has signal, the signal that each road back transmission optical receiver receives all can be incorporated into a road, then is exported by radio frequency, noise on the back transmission optical receiver of each like this road will superpose, and affects the signal to noise ratio of return system.And be at present all separate at Guang Zhanzhongmei road optical receiver, if there is a rf output circuit on every road, the space that so certainly will take circuit board is comparatively large, affects the expansion in follow-up space.
Utility model content
Technical problem to be solved in the utility model is, overcomes the defect of prior art, provide can solve multi-path light receiver close road time, noise superposition problem and also the less Combined back transmission optical receiver that takes up room.
For solving the problems of the technologies described above, the utility model proposes a kind of Combined back transmission optical receiver, it is characterized in that: it comprises a radio frequency controlled switch S, described radio frequency controlled switch S has a radio-frequency (RF) output end OUT, multiple rf inputs and control end, described each rf inputs all connects a road optical receiving circuit, described every road optical receiving circuit includes power supply VCC, photodiode PD, resistance R, signal processing circuit A, splitter C, radio frequency amplifier AMP, radio-frequency probe RD and comparator P, described power supply VCC connects ground connection after photodiode PD and resistance R successively, the output of described photodiode PD connects the input of splitter C by signal processing circuit A, one of described splitter C exports the input of termination radio frequency amplifier AMP, the rf inputs of the output termination radio frequency controlled switch S of radio frequency amplifier AMP, the input of another output termination radio-frequency probe RD of described splitter C, an input of the output termination comparator P of described radio-frequency probe RD, another input termination threshold voltage input VREF of comparator P, the control end of the output termination radio frequency controlled switch S of comparator P.
After adopting aforesaid way, original independently multi-path light receiver is combined in a product, switched by a radio frequency controlled switch and export, in the optical receiving circuit of every road, if there is light signal to input, then convert light signal to radiofrequency signal by photodiode PD and signal processing circuit A, and give rf detector by splitter by a part of along separate routes for radiofrequency signal, if rf detector detects radiofrequency signal, then convert the signal of telecommunication to, compared with a threshold voltage by comparator, if exceed this threshold voltage, then output a control signal to the control end of radio frequency controlled switch, if namely have light signal to input in this road optical receiving circuit, then radio frequency controlled switch just receives the control signal on this road, thus the radio frequency amplifier Shi Gai road radiofrequency signal connecting this road exports radiofrequency signal by radio-frequency (RF) output end OUT.Solve the problem of original noise superposition like this, reduce the signal to noise ratio of return system, and due to original independently multi-path light receiver is combined in a product, this product only has a radio frequency to export, so decrease the space hold of optical receiver, and simplify the wiring problems originally connecing external radio frequency equipment, namely original needs many lines, only need single line now.
As preferably, described radio frequency controlled switch S has 4 rf inputs, described optical receiving circuit has 4 tunnels, 4 rf inputs of the output termination radio frequency controlled switch S of the radio frequency amplifier AMP of each optical receiving circuit, the output of the comparator P of each optical receiving circuit all connects the control end of radio frequency controlled switch S.Adopting in this way, is be grouped together by 4 road optical receiving circuits.
The control end of described radio frequency controlled switch S also connects an encoder, and the input of described encoder is connected with every road optical receiving circuit, and the output of encoder is connected with the control end of radio frequency controlled switch S.Adopt in this way, when there being the optical receiving circuit of more multichannel to be grouped together, expansion interface can be carried out by encoder and such as adopt 8-3 line encoder, radio frequency controlled switch S only needs 3 control ends just can control 8 road optical receiving circuits, 16-4 line encoder, radio frequency controlled switch needs 4 control ends to control 16 road optical receiving circuits.
Accompanying drawing explanation
Fig. 1 is the circuit diagram of the utility model embodiment;
Embodiment
Below in conjunction with the drawings and specific embodiments, the utility model is described in further detail:
As shown in Figure 1, for embodiment, a kind of Combined back transmission optical receiver, it comprises a radio frequency controlled switch S, described radio frequency controlled switch S has a radio-frequency (RF) output end OUT, 4 rf inputs and control end, described each rf inputs all connects a road optical receiving circuit, described every road optical receiving circuit includes power supply VCC, photodiode PD, resistance R, signal processing circuit A, splitter C, radio frequency amplifier AMP, radio-frequency probe RD and comparator P, described power supply VCC connects ground connection after photodiode PD and resistance R successively, the output of described photodiode PD connects the input of splitter C by signal processing circuit A, one of described splitter C exports the input of termination radio frequency amplifier AMP, the rf inputs of the output termination radio frequency controlled switch S of radio frequency amplifier AMP, the input of another output termination radio-frequency probe RD of described splitter C, an input of the output termination comparator P of described radio-frequency probe RD, another input termination threshold voltage input VREF of comparator P, the control end of the output termination radio frequency controlled switch S of comparator P.
The output of the comparator P of described 4 road optical receiving circuits is respectively control1, control2, control3, control4, the control end of radio frequency controlled switch S also has 4, be connected with control1, control2, control3, control4 respectively, when have have signal on the way time, radio frequency controlled switch S just controls radio-frequency (RF) output end OUT and is communicated with the output of the radio frequency amplifier on this road, and radio-frequency (RF) output end OUT just exports the radiofrequency signal on this road.Because in fact each just only has a road optical receiver job, therefore, this circuit can ensure that optical receiver normally works completely.
After adopting aforesaid way, original independently multi-path light receiver is combined in a product, switched by a radio frequency controlled switch and export, in the optical receiving circuit of every road, if there is light signal to input, then convert light signal to radiofrequency signal by photodiode PD and signal processing circuit A, and give rf detector by splitter by a part of along separate routes for radiofrequency signal, if rf detector detects radiofrequency signal, then convert the signal of telecommunication to, compared with a threshold voltage by comparator, if exceed this threshold voltage, then output a control signal to the control end of radio frequency controlled switch, if namely have light signal to input in this road optical receiving circuit, then radio frequency controlled switch just receives the control signal on this road, thus the radio frequency amplifier Shi Gai road radiofrequency signal connecting this road exports radiofrequency signal by radio-frequency (RF) output end OUT.Solve the problem of original noise superposition like this, reduce the signal to noise ratio of return system, and due to original independently multi-path light receiver is combined in a product, this product only has a radio frequency to export, so decrease the space hold of optical receiver, and simplify the wiring problems originally connecing external radio frequency equipment, namely original needs many lines, only need single line now.
As the improvement of a nearlyer step, the control end of described radio frequency controlled switch S also connects an encoder, and the input of described encoder is connected with every road optical receiving circuit, and the output of encoder is connected with the control end of radio frequency controlled switch S.Adopt in this way, when there being the optical receiving circuit of more multichannel to be grouped together, expansion interface can be carried out by encoder and such as adopt 8-3 line encoder, radio frequency controlled switch S only needs 3 control ends just can control 8 road optical receiving circuits, 16-4 line encoder, radio frequency controlled switch needs 4 control ends to control 16 road optical receiving circuits.
Claims (3)
1. a Combined back transmission optical receiver, it is characterized in that: it comprises a radio frequency controlled switch S, described radio frequency controlled switch S has a radio-frequency (RF) output end OUT, multiple rf inputs and control end, described each rf inputs all connects a road optical receiving circuit, described every road optical receiving circuit includes power supply VCC, photodiode PD, resistance R, signal processing circuit A, splitter C, radio frequency amplifier AMP, radio-frequency probe RD and comparator P, described power supply VCC connects ground connection after photodiode PD and resistance R successively, the output of described photodiode PD connects the input of splitter C by signal processing circuit A, one of described splitter C exports the input of termination radio frequency amplifier AMP, the rf inputs of the output termination radio frequency controlled switch S of radio frequency amplifier AMP, the input of another output termination radio-frequency probe RD of described splitter C, an input of the output termination comparator P of described radio-frequency probe RD, another input termination threshold voltage input VREF of comparator P, the control end of the output termination radio frequency controlled switch S of comparator P.
2. Combined back transmission optical receiver according to claim 1, it is characterized in that: described radio frequency controlled switch S has 4 rf inputs, described optical receiving circuit has 4 tunnels, 4 rf inputs of the output termination radio frequency controlled switch S of the radio frequency amplifier AMP of each optical receiving circuit, the output of the comparator P of each optical receiving circuit all connects the control end of radio frequency controlled switch S.
3. Combined back transmission optical receiver according to claim 1, it is characterized in that: the control end of described radio frequency controlled switch S also connects an encoder, the input of described encoder is connected with every road optical receiving circuit, and the output of encoder is connected with the control end of radio frequency controlled switch S.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520061377.8U CN204316673U (en) | 2015-01-28 | 2015-01-28 | Combination back transmission optical receiver |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520061377.8U CN204316673U (en) | 2015-01-28 | 2015-01-28 | Combination back transmission optical receiver |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204316673U true CN204316673U (en) | 2015-05-06 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520061377.8U Active CN204316673U (en) | 2015-01-28 | 2015-01-28 | Combination back transmission optical receiver |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN204316673U (en) |
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2015
- 2015-01-28 CN CN201520061377.8U patent/CN204316673U/en active Active
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| C14 | Grant of patent or utility model | ||
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