CN201422142Y - Optical receiver based on wire television optical fiber transmission network - Google Patents
Optical receiver based on wire television optical fiber transmission network Download PDFInfo
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- CN201422142Y CN201422142Y CN2009203017672U CN200920301767U CN201422142Y CN 201422142 Y CN201422142 Y CN 201422142Y CN 2009203017672 U CN2009203017672 U CN 2009203017672U CN 200920301767 U CN200920301767 U CN 200920301767U CN 201422142 Y CN201422142 Y CN 201422142Y
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Abstract
The utility model is applicable to the optical communication field and provides an optical receiver based on a wire television optical fiber transmission network. The optical receiver comprises a photoelectric conversion unit which is used to convert the inputted optical signals into electrical signals and achieve the match of resistance, a wide range AGC output adjustment unit and an output adjustment and enlarge unit, wherein the optical receiver can carry out the automatic gain control according to the changes of signal levels outputted by the photoelectric conversion unit, when the opticalpower of the inputted optical signals fluctuates at a certain scope, the outputted electrical signal levels can keep stable without changes, and the output adjustment and enlarge unit can enlarge theRF signals outputted to the wide range AGC output adjustment unit and set the output levels and the preset slopes.
Description
Technical field
The utility model belongs to optical communication field, relates in particular to a kind of optical receiver based on the cable TV optical fiber transmission network.
Background technology
Optical receiver is the receiving equipment that a kind of light indispensable in the cable TV optical fiber transmission network changes electricity.Continuous progress along with optical fiber transmission technique, the development of Optical Fiber Transmission by optical fiber to the section, FTTC, Fiber-To-The-Building be to continuous upgrading and the refinement of optical fiber to resident family, make that the quantity of optical node is more and more, the optical signal power that optical node receives is inconsistent, simultaneously but require the power output of optical sender very big, and very stable, even improve this situation, also there are following these problems: 1, the parking space deficiency of calculator room equipment by the usage quantity that increases optical sender; 2, the difficulty of the difficulty of network design and complexity and network operation is excessive; 3, the construction cost of optical fiber transmission network is too high.At present, general common optical receiver is difficult to the high output level that assurance has the superperformance index under the situation of low received optical power.Generally connect the way that joins amplifier and solve this problem, but so both increased the networking input, increased network operation cost and networking maintenance difficulties again by increase.
The utility model content
The purpose of this utility model is: a kind of optical receiver based on the cable TV optical fiber transmission network is provided, be intended to solve existing optical receiver and under the situation of low received optical power, be difficult to the high output level that assurance has the superperformance index, need to connect the connection amplifier and address this problem, thereby cause network construction cost, network operation cost and the bigger problem of networking maintenance difficulties by increase.
The purpose of this utility model is achieved in that
A kind of optical receiver based on the cable TV optical fiber transmission network comprises:
Photoelectric conversion unit, the coupling that the light signal that is used for importing converts the signal of telecommunication to and realizes impedance;
Wide region AGC exports regulon, is used for carrying out automatic gain control according to the variation of the signal level of photoelectric conversion unit output, and when the luminous power that realizes input optical signal fluctuateed within the specific limits, the electrical signal levels of output kept stablizing constant; And
Output is regulated and amplifying unit, is used for that RF signal to the output of wide region AGC output regulon amplifies and output level is set and preset slope and sets.
Described wide region AGC output regulon comprises voltage-controlled attenuator and AGC control module, the AGC control module increases in the signal level of photoelectric conversion unit output/when reducing, the control corresponding voltage-controlled attenuator increases/reduces attenuation, remains unchanged with the level of realizing the RF signal that voltage-controlled attenuator is exported.
Described output adjusting and amplifying unit comprise:
The low noise pre-amplifying module is used for the RF radiofrequency signal of voltage-controlled attenuator output is amplified, to remedy the signal level of institute's loss in the automatic gain control process;
Output is regulated and the slope-compensation module, is used for the RF signal of low noise pre-amplifying module output is carried out the output level setting and presets the slope setting; And
Low noise merit times amplification module is used for that the RF signal that output is regulated and the slope-compensation module is exported is carried out final stage and amplifies.
Described certain limit is specially+3dBm～-7dBm.
Described photoelectric conversion unit is used for that also the RF radiofrequency signal behind the transimpedence is carried out primary signal and amplifies.
Described optical receiver also comprises:
Received optical power and output level display unit are used to show the size and the optical receiver output signal level value of the luminous power of input optical signal.
Described optical receiver also comprises:
The network management interface unit is used to gather received optical power sampling, RF sample of signal, DC power supply sampling and the AC power sampling of optical receiver and sends to network management responder.
Described optical receiver also comprises:
The RF signal distribution unit is used for the way of output according to the information Control optical receiver of user's distribution network needs setting.
Described optical receiver also comprises:
Controllable electric power injection unit being used for realizing power supply control, reaches interchange 60V power supply and RF radiofrequency signal and mixes the function that passes with cable.
Outstanding advantage of the present utility model is: the utility model is by the photoelectric conversion module of configuration high-responsivity, add that low noise radio frequency amplifier guarantees the high carrier-to-noise ratio (C/N 〉=46dB) of optical fiber link network, in addition, by distinctive AGC control circuit can realize optical receiver the wide region input optical power (+3dBm～-still can export stable signal level under 7dBm) the condition, and departure only is ± 0.5dB, simultaneously, do final stage output at the PD RF Amplifier Module that output disposes low noise high-performance parameter, can guarantee that optical receiver still can have high output signal level (two-way output level 〉=110dBuV) and higher non-linearity technical indicator (CTB 〉=58dB under the condition of low received optical power, CSO 〉=56dB).
Description of drawings
Fig. 1 is the structure chart based on the optical receiver of cable TV optical fiber transmission network that the utility model first embodiment provides;
Fig. 2 is the structure chart based on the optical receiver of cable TV optical fiber transmission network that the utility model second embodiment provides.
Embodiment
In order to make the purpose of this utility model, technical scheme and advantage clearer,, the utility model is further elaborated below in conjunction with drawings and Examples.Should be appreciated that specific embodiment described herein only in order to explanation the utility model, and be not used in qualification the utility model.
The structure based on the optical receiver of cable TV optical fiber transmission network that Fig. 1 shows that the utility model first embodiment provides for convenience of explanation, only shows the part relevant with the utility model.
Photoelectric conversion unit 1 is used for the light signal of input is converted to the coupling of the signal of telecommunication and impedance, simultaneously, be used for that also the RF radiofrequency signal behind the transimpedence is carried out first time signal level and promote, with carrier-to-noise ratio (C/N) parameter index of the RF signal that guarantees output in follow-up automatic gain control (AGC) control procedure not by deterioration.
Wide region AGC output regulon 2 will be realized the control of AGC according to the variation of the signal level of photoelectric conversion unit 1 output, guarantee input optical signal power wide region (+3dBm～-when fluctuating in 7dBm), it is stable that the electrical signal levels of output can keep, and concrete AGC control procedure is:
When the light signal of input increases, the signal level of photoelectric conversion unit 1 output will increase, 22 control voltage-controlled attenuators of AGC control module 21 increase attenuation, with the signal level of counteracting photoelectric conversion unit 1 increase, thereby the RF signal level of voltage-controlled attenuator 21 outputs are remained unchanged; When the light signal of input reduces, the signal level of photoelectric conversion unit 1 output will reduce, 22 control voltage-controlled attenuators 21 of AGC control module reduce attenuation, remedying the signal level that photoelectric conversion unit 1 reduces, thereby the RF signal level of voltage-controlled attenuator 21 outputs still can be remained unchanged.
Low noise pre-amplifying module 31 in output adjusting and the amplifying unit 3 will carry out the second time to the RF radiofrequency signal of voltage-controlled attenuator 21 outputs and amplify, to remedy the signal level of institute's loss in the above-mentioned AGC control procedure.The signal of low noise pre-amplifying module 31 outputs is finished the output level setting of optical receiver and is preset the slope setting through output adjusting and slope-compensation module 32, preset the RF radiofrequency signal that slope sets by 33 pairs of processes of low noise merit times amplification module again and amplify output for the third time, to promote the output signal of optical receiver, and the nonlinear technology index that improves output RF radiofrequency signal: the parameter value of three poor proportionings of carrier combination (CTB) and carrier combination second difference proportioning (CSO), in order to guarantee the high output level of optical receiver output high target.
The corresponding relation between control change in optical signal amount and the optical-electrical converter bias voltage is mainly passed through in the realization of departure precision in the above-mentioned AGC control module 22, and the suitable circuit structure of arranging in pairs or groups is realized.
The structure that Fig. 2 shows that the utility model second embodiment provides based on the optical receiver of cable TV optical fiber transmission network.
In the utility model embodiment, described optical receiver comprises that also received optical power and output level display unit 4, network management interface unit 5, RF signal distribution unit 6 and controllable electric power inject unit 7.
Network management interface unit 5 is as the communication interface of optical receiver and network management responder, its included received optical power sampling module 51, RF sample of signal module 52, direct current sampling module 53 and alternating current sampling module 54 are gathered respectively and are provided received optical power sampling, RF sample of signal, DC power supply sampling and AC power sampling to network management responder, and network management responder is sent the configuration information that receives into network management system.
4 signals of gathering according to received optical power sampling module 51 of received optical power and output level display unit, the size and the optical receiver output signal level value that show the luminous power of input optical signal, for example can carry out digitlization by the resolution of 0.1dBm shows, its displayable reference optical power is :-7dBm～+ 3dBm, the output level value of changeable display light receiver simultaneously.
6 way of outputs of RF signal distribution unit according to the information Control optical receiver of user's distribution network needs setting.
Controllable electric power injects 7 of unit and is used for realizing power supply control, and exchanges 60V power supply and RF radiofrequency signal are mixed biography with cable function.
The utility model provide based on the optical receiver of cable TV optical fiber transmission network photoelectric conversion module by the configuration high-responsivity, add that low noise radio frequency amplifier guarantees the high carrier-to-noise ratio (C/N 〉=46dB) of optical fiber link network, in addition, by distinctive AGC control circuit can realize optical receiver the wide region input optical power (+3dBm～-still can export stable signal level under 7dBm) the condition, and departure only is ± 0.5dB, simultaneously, do final stage output at the PD RF Amplifier Module that output disposes low noise high-performance parameter, can guarantee that optical receiver still can have high output signal level (two-way output level 〉=110dBuV) and higher non-linearity technical indicator (CTB 〉=58dB under the condition of low received optical power, CSO 〉=56dB).
The use of this equipment can be exempted the calculating of loaded down with trivial details splitting ratio in the design of networking, can obtain high output signal level again than high target, transmit the effective of signal, stability is high, and network design is simple, project cost is low, can satisfy fiber optic network well and develop into Lou Dong, and fiber optic network arrives the needs of resident family, the wired TV amplifier of direct alternate user end, reduce network design difficulty and network construction cost, reduce the network operation input.
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 (9)
1. the optical receiver based on the cable TV optical fiber transmission network is characterized in that, comprising:
Photoelectric conversion unit, the coupling that the light signal that is used for importing converts the signal of telecommunication to and realizes impedance;
Wide region AGC exports regulon, is used for carrying out automatic gain control according to the variation of the signal level of photoelectric conversion unit output, and when the luminous power that realizes input optical signal fluctuateed within the specific limits, the electrical signal levels of output kept stablizing constant; And
Output is regulated and amplifying unit, is used for that RF signal to the output of wide region AGC output regulon amplifies and output level is set and preset slope and sets.
2. the optical receiver based on the cable TV optical fiber transmission network as claimed in claim 1, it is characterized in that, described wide region AGC output regulon comprises voltage-controlled attenuator and AGC control module, the AGC control module increases in the signal level of photoelectric conversion unit output/when reducing, the control corresponding voltage-controlled attenuator increases/reduces attenuation, remains unchanged with the level of realizing the RF signal that voltage-controlled attenuator is exported.
3. the optical receiver based on the cable TV optical fiber transmission network as claimed in claim 2 is characterized in that, described output adjusting and amplifying unit comprise:
The low noise pre-amplifying module is used for the RF radiofrequency signal of voltage-controlled attenuator output is amplified, to remedy the signal level of institute's loss in the automatic gain control process;
Output is regulated and the slope-compensation module, is used for the RF signal of low noise pre-amplifying module output is carried out the output level setting and presets the slope setting; And
Low noise merit times amplification module is used for that the RF signal that output is regulated and the slope-compensation module is exported is carried out final stage and amplifies.
4. the optical receiver based on the cable TV optical fiber transmission network as claimed in claim 1 is characterized in that, described certain limit is specially+and 3dBm～-7dBm.
5. the optical receiver based on the cable TV optical fiber transmission network as claimed in claim 1 is characterized in that, described photoelectric conversion unit is used for that also the RF radiofrequency signal behind the transimpedence is carried out primary signal and amplifies.
6. the optical receiver based on the cable TV optical fiber transmission network as claimed in claim 1 is characterized in that, described optical receiver also comprises:
Received optical power and output level display unit are used to show the size and the optical receiver output signal level value of the luminous power of input optical signal.
7. the optical receiver based on the cable TV optical fiber transmission network as claimed in claim 1 is characterized in that, described optical receiver also comprises:
The network management interface unit is used to gather received optical power sampling, RF sample of signal, DC power supply sampling and the AC power sampling of optical receiver and sends to network management responder.
8. the optical receiver based on the cable TV optical fiber transmission network as claimed in claim 7 is characterized in that, described optical receiver also comprises:
The RF signal distribution unit is used for the way of output according to the information Control optical receiver of user's distribution network needs setting.
9. the optical receiver based on the cable TV optical fiber transmission network as claimed in claim 1 is characterized in that, described optical receiver also comprises:
Controllable electric power injection unit being used for realizing power supply control, reaches interchange 60V power supply and RF radiofrequency signal and mixes the function that passes with cable.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009203017672U CN201422142Y (en) | 2009-03-31 | 2009-03-31 | Optical receiver based on wire television optical fiber transmission network |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009203017672U CN201422142Y (en) | 2009-03-31 | 2009-03-31 | Optical receiver based on wire television optical fiber transmission network |
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| CN201422142Y true CN201422142Y (en) | 2010-03-10 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2009203017672U Expired - Fee Related CN201422142Y (en) | 2009-03-31 | 2009-03-31 | Optical receiver based on wire television optical fiber transmission network |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102088318A (en) * | 2010-12-16 | 2011-06-08 | 四川九州电子科技股份有限公司 | Optical AGC control circuit and attenuation value acquisition method thereof |
| CN106572318A (en) * | 2016-10-19 | 2017-04-19 | 深圳市茁壮网络股份有限公司 | Cable television network fiber signal processing device and processing method |
-
2009
- 2009-03-31 CN CN2009203017672U patent/CN201422142Y/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102088318A (en) * | 2010-12-16 | 2011-06-08 | 四川九州电子科技股份有限公司 | Optical AGC control circuit and attenuation value acquisition method thereof |
| CN106572318A (en) * | 2016-10-19 | 2017-04-19 | 深圳市茁壮网络股份有限公司 | Cable television network fiber signal processing device and processing method |
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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 | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20100310 Termination date: 20170331 |