CN207782814U - One kind being used for photoreceiver bandwidth adjustment device - Google Patents
One kind being used for photoreceiver bandwidth adjustment device Download PDFInfo
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- CN207782814U CN207782814U CN201820111315.7U CN201820111315U CN207782814U CN 207782814 U CN207782814 U CN 207782814U CN 201820111315 U CN201820111315 U CN 201820111315U CN 207782814 U CN207782814 U CN 207782814U
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Abstract
One kind of the utility model is used for photoreceiver bandwidth adjustment device, and upstream bandwidth frequency detection circuit and downlink bandwidth frequency detection circuit are all connected with bandwidth frequency control circuit, and bandwidth frequency control circuit connects bandwidth frequency and adjusts circuit；Efficiently solving current photoreceiver takes permanent circuit structure to realize filtering, and the signal bandwidth of output is fixed, the problem of can not adjusting.The upstream bandwidth frequency that high-pass filter and low-pass filter detect and downlink bandwidth frequency are calculated bandwidth by the utility model by difference operation, and enters window circuit and analyze and determine, when bandwidth is normal, window circuit exports low level, bandwidth signal is output to photoreceiver by relay normally closed contact, otherwise, bandwidth signal is coupled to the first-stage frequency modulation circuit that triode Q2 is core, enter the frequency-selective circuit of inductance L5, capacitance C10 compositions later, the modulation frequency of necessary requirement is generated, realizes that bandwidth frequency is adjusted.
Description
Technical field
The utility model is related to photoreceiver technical fields, are filled for photoreceiver bandwidth adjustment more particularly to one kind
It sets.
Background technology
Photoreceiver is the equipment for receiving optical signal, photodetector, filter and amplifier is generally included, in fiber optic communication
In system, the task of photoreceiver is recovered after optical fiber transmits entrained by light carrier with minimum additional noise and distortion
Information, therefore the output characteristics concentrated expression of the photoreceiver performance of entire optical fiber telecommunications system, photodetector it is main
Effect is that optical signal is changed into electric signal using photoelectric effect, currently, common photodetector is photodiode, snowslide light
Electric diode, since the signal that photoreceiver receives is very faint, and in addition in the disturbed condition of high background noise field
Under, receiving terminal signal-to-noise ratio S/N can be caused<1, so being very necessary to the processing of signal, filter and amplification is usually taken
The electric signal that device exports photodetector is handled.
The filter of existing photoreceiver generally takes permanent circuit structure to realize filtering, that is to say, that its frequency filtering
It is fixed, so the signal bandwidth of final output is fixed, it is unfavorable for the docking collection of letters number in this way and is adjusted, it is difficult to accomplish to believe
Number distortion factor drop to level off to it is minimum.
So the utility model provides a kind of new scheme to solve the problems, such as this.
Invention content
For the above situation, to overcome the defect of the prior art, being designed to provide for the utility model a kind of for light
Receiver bandwidth regulating device has and is skillfully constructed and the characteristic of human oriented design, efficiently solves current photoreceiver and adopt
Permanent circuit structure is taken to realize filtering, the signal bandwidth of output is fixed, the problem of can not adjusting.
Its technical solution solved is, including upstream bandwidth frequency detection circuit, downlink bandwidth frequency detection circuit, bandwidth
Frequency control circuit, bandwidth frequency adjust circuit, which is characterized in that upstream bandwidth frequency detection circuit and the inspection of downlink bandwidth frequency
Slowdown monitoring circuit is all connected with bandwidth frequency control circuit, and bandwidth frequency control circuit connects bandwidth frequency and adjusts circuit；
The bandwidth frequency control circuit includes operational amplifier A R3, and the in-phase input end of operational amplifier A R3 connects respectively
Connect one end of ground resistance R10, one end of resistance R9, one end of the other end connection grounded inductor L1 of resistance R9, operation amplifier
The inverting input of device AR3 be separately connected one end of resistance R8, resistance R11 one end, the other end of resistance R11 is separately connected fortune
Calculate output end, the common end of relay K1, the inverting input of operational amplifier A R4, the operational amplifier A R5 of amplifier AR3
Inverting input, the in-phase input end of operational amplifier A R4 be separately connected one end of resistance R14, resistance R13 one end, fortune
Calculate amplifier AR5 in-phase input end be separately connected one end of resistance R12, resistance R13 the other end, the other end of resistance R14
Power supply+5V is connected, the output end of operational amplifier A R4 and the output end of operational amplifier A R5 are all connected with the base stage of triode Q1,
The emitter connection ground of triode Q1, the collector of triode Q1 are separately connected the anode of diode D1, relay K1 coils
One end, the cathode of diode D1, the other end of relay K1 coils are all connected with power supply+12V；
It includes triode Q2 that the bandwidth frequency, which adjusts circuit, the base stage of triode Q2 be separately connected one end of resistance R15,
One end of capacitance C7, the normally opened contact of the other end connection relay K1 of capacitance C7, the emitter of triode Q2, which is separately connected, to be connect
The collector of one end of ground capacitance C8, one end of ground resistance R16, triode Q2 is separately connected one end of resistance R17, inductance L3
One end, the other end of inductance L3 be separately connected one end of inductance L4, one end of capacitance C10, grounded inductor L5 one end, inductance
The other end of L4 be separately connected one end of ground capacity C9, ground resistance R18 one end, the other end and relay of capacitance C10
The normally-closed contact of K1 is the output end that bandwidth frequency adjusts circuit.
The utility model is simple in structure, is skillfully constructed, the upstream bandwidth frequency that high-pass filter and low-pass filter are detected
Rate and downlink bandwidth frequency calculate bandwidth by difference operation, and enter window circuit and analyze and determine, when bandwidth is normal, window
Mouth circuit output low level, bandwidth signal are output to photoreceiver by relay normally closed contact, and otherwise, bandwidth signal is coupled to
Triode Q2 is the first-stage frequency modulation circuit of core, enters the frequency-selective circuit of inductance L5, capacitance C10 compositions later, required for generation
The modulation frequency asked realizes that bandwidth frequency is adjusted.
Description of the drawings
Fig. 1 is the circuit link block figure of the utility model.
Fig. 2 is the circuit catenation principle figure of the utility model signal processing.
Specific implementation mode
Aforementioned and other technology contents, feature and effect in relation to the utility model, in following cooperation with reference to figures 1 through figure
In the detailed description of 2 pairs of embodiments, can clearly it present.The structure content being previously mentioned in following embodiment is with explanation
Book attached drawing is reference.
Each exemplary embodiment of the utility model is described below with reference to accompanying drawings.
Embodiment one, one kind being used for photoreceiver bandwidth adjustment device, including upstream bandwidth frequency detection circuit passes through height
The upstream bandwidth frequency of detection is transmitted to bandwidth frequency control circuit by bandpass filter, and downlink bandwidth frequency detection circuit passes through low
The downlink bandwidth frequency of detection is transmitted to bandwidth frequency control circuit by bandpass filter, and bandwidth frequency control circuit passes through subtracter
It carries out difference operation and calculates bandwidth, and enter window circuit and analyze and determine, when bandwidth is normal, window circuit exports low electricity
Flat, bandwidth frequency adjusts circuit and does not work, and bandwidth signal is output to photoreceiver by relay normally closed contact, and otherwise output is high
Level, triode Q1 conducting, relay K1 coils obtain electric, and bandwidth signal, which is coupled to bandwidth frequency and adjusts triode Q2 in circuit, is
The first-stage frequency modulation circuit of core enters the frequency-selective circuit of inductance L5, capacitance C10 compositions, generates the frequency modulation frequency of necessary requirement later
It is normal to realize that bandwidth frequency is adjusted for rate；The bandwidth frequency control circuit carries out difference operation by subtracter and calculates bandwidth, and
It is analyzed and determined into window circuit, when bandwidth is normal, window circuit exports low level, otherwise exports high level, passes through driving
Triode Q1 control relay K1 coils power failure state, including operational amplifier A R3, operational amplifier A R3, resistance R8,
Resistance R9, resistance R10, resistance R11 constitute subtracter, by the upstream bandwidth frequency of the inverting input of operational amplifier A R3 and
The downlink bandwidth frequency of the in-phase input end of operational amplifier A R3 carries out subtraction, defeated from the output end of operational amplifier A R3
Go out bandwidth signal, this bandwidth signal is sent into the common end of relay K1 all the way, and another way enters operational amplifier A R4, operation is put
The inverting input of the window circuit of big device AR5 compositions, the in-phase input end of operational amplifier A R4 and operational amplifier A R5's
In-phase input end is threshold voltage end（The bound threshold value end for allowing bandwidth signal to fluctuate）, by resistance R14, resistance R13, electricity
The bleeder circuit for hindering R12 compositions provides, and when bandwidth is normal, the output end of operational amplifier A R4 and operational amplifier A R5's is defeated
Outlet exports low level, and triode Q1 cut-offs, relay K1 coils must not be electric, and bandwidth frequency adjusts circuit and do not work, bandwidth letter
Number photoreceiver is directly output to by relay normally closed contact, otherwise, the output end and operational amplifier of operational amplifier A R4
The output end of AR5 exports high level, and triode Q1 conductings, relay K1 coils obtain electric, relay K1 normally opened contacts closure, bandwidth
Signal is coupled to the base stage that bandwidth frequency adjusts triode Q2 in circuit；The bandwidth frequency adjusts circuit
The first-stage frequency modulation circuit of core enters the frequency-selective circuit of inductance L5, capacitance C10 compositions, generates the frequency modulation frequency of necessary requirement later
Rate realizes that bandwidth frequency is adjusted, including triode Q2, and bandwidth signal is added to triode Q2 through capacitance C7 couplings, resistance R15 biasings
Base stage, the emitter of triode Q2 be separately connected one end of shunt capacitance C8, emitter resistance R16 one end, triode Q2
Collector output, the other end connection inductance L4 upper ends of inductance L3, resistance R18 and capacitance after the connection of the lower ends inductance L4 is in parallel
The upper end of the RC circuits of C9 compositions, generates resonant frequency, that is, bandwidth frequency signal, and bandwidth frequency signal at this time is easily by extraneous frequency
Rate, noise signal interference, the frequency-selective circuit through inductance L5 and capacitance C10 compositions, to obtain the optimum bandwidth frequency of necessary requirement
Rate realizes that bandwidth frequency is adjusted.
Embodiment two, on the basis of embodiment one, the upstream bandwidth frequency detection circuit will by high-pass filter
The upstream bandwidth frequency of detection is transmitted to bandwidth frequency control circuit, including operational amplifier A R1, the band of model DS2400Q
The photoreceiver bandwidth signal of wide tester detection is sent to the same mutually defeated of operational amplifier A R1 after resistance R1, capacitance C1 filtering
Enter end, the inverting input of operational amplifier A R1 is frequency modulation(PFM) end, passes through electricity in parallel by operational amplifier A R1 output ends
R3, capacitance C1 is hindered to constitute, regulation resistance R3, capacitance C1 the adjustable bandwidth passed through of value frequency, after through inductance L1, capacitance
It is exported after C3 filtering；The upstream bandwidth frequency of detection is transmitted to by the downlink bandwidth frequency detection circuit by low-pass filter
Bandwidth frequency control circuit includes operational amplifier A R2, the photoreceiver bandwidth of the bandwidth test instrument detection of model DS2400Q
Signal enters the low-pass filter of operational amplifier A R2, capacitance C4, capacitance C5, resistance R5, resistance R6, resistance R7 compositions, adjusts
The frequency of the adjustable bandwidth passed through of value of resistance R7, capacitance C4, capacitance C5, after exported after inductance L2, capacitance C6 filtering.
When the utility model is specifically used, the photoreceiver bandwidth signal of the bandwidth test instrument detection of model DS2400Q
The high-pass filtering circuit constituted into operational amplifier A R1, resistance R1, capacitance C1, resistance R3, capacitance C1, detects uplink band
After broadband bandwidth frequency control circuit, the bandwidth test instrument of model DS2400Q are output to after inductance L1, capacitance C3 filtering
The photoreceiver bandwidth signal of detection enters operational amplifier A R2, capacitance C4, capacitance C5, resistance R5, resistance R6, resistance R7 groups
At low-pass filter, detect to export after inductance L2, capacitance C6 filtering after downlink bandwidth frequency, bandwidth frequency control circuit
Difference operation is carried out by subtracter and calculates bandwidth, and is entered window circuit and analyzed and determined, when bandwidth is normal, window circuit
Low level is exported, bandwidth frequency adjusts circuit and do not work, and bandwidth signal is output to photoreceiver by relay normally closed contact, no
Then export high level, triode Q1 conductings, relay K1 coils obtain electric, and bandwidth signal is coupled to bandwidth frequency and adjusts three in circuit
Pole pipe Q2 is the first-stage frequency modulation circuit of core, enters the frequency-selective circuit of inductance L5, capacitance C10 compositions later, generates necessary requirement
Modulation frequency, it is normal to realize that bandwidth frequency is adjusted.
The above is to combine specific implementation mode further detailed description of the utility model, and it cannot be said that originally
Utility model specific implementation is limited only to this；For belonging to the utility model and for those skilled in the technology concerned,
Under the premise of technical solutions of the utility model thinking, made by expand and operating method, data replacement, should all fall
Within scope of protection of the utility model.
Claims (2)
1. one kind being used for photoreceiver bandwidth adjustment device, including upstream bandwidth frequency detection circuit, downlink bandwidth frequency detecting
Circuit, bandwidth frequency control circuit, bandwidth frequency adjust circuit, which is characterized in that upstream bandwidth frequency detection circuit and downlink
Bandwidth frequency detection circuit is all connected with bandwidth frequency control circuit, and bandwidth frequency control circuit connects bandwidth frequency and adjusts circuit；
The bandwidth frequency control circuit includes operational amplifier A R3, and the in-phase input end of operational amplifier A R3, which is separately connected, to be connect
One end of ground resistance R10, one end of resistance R9, one end of the other end connection grounded inductor L1 of resistance R9, operational amplifier A R3
Inverting input be separately connected one end of resistance R8, resistance R11 one end, the other end of resistance R11 is separately connected operation and puts
The output end of big device AR3, the common end of relay K1, the inverting input of operational amplifier A R4, operational amplifier A R5 it is anti-
Phase input terminal, the in-phase input end of operational amplifier A R4 be separately connected one end of resistance R14, resistance R13 one end, operation puts
The in-phase input end of big device AR5 be separately connected one end of resistance R12, resistance R13 the other end, the other end connection of resistance R14
The output end of power supply+5V, operational amplifier A R4 and the output end of operational amplifier A R5 are all connected with the base stage of triode Q1, three poles
The emitter connection ground of pipe Q1, the collector of triode Q1 are separately connected one end of the anode of diode D1, relay K1 coils,
The cathode of diode D1, the other end of relay K1 coils are all connected with power supply+12V；
It includes triode Q2 that the bandwidth frequency, which adjusts circuit, and the base stage of triode Q2 is separately connected one end of resistance R15, capacitance
One end of C7, the normally opened contact of the other end connection relay K1 of capacitance C7, the emitter of triode Q2 are separately connected ground connection electricity
Hold one end of C8, ground resistance R16 one end, the collector of triode Q2 be separately connected one end of resistance R17, inductance L3 one
End, the other end of inductance L3 be separately connected one end of inductance L4, one end of capacitance C10, grounded inductor L5 one end, inductance L4's
The other end be separately connected one end of ground capacity C9, ground resistance R18 one end, the other end of capacitance C10 and relay K1's
Normally-closed contact is the output end that bandwidth frequency adjusts circuit.
2. according to claim 1 a kind of for photoreceiver bandwidth adjustment device, which is characterized in that the upstream bandwidth
Frequency detection circuit includes operational amplifier A R1, and the in-phase input end of operational amplifier A R1 is separately connected the one of ground resistance R1
It holds, one end of capacitance C1, the photoreceiver bandwidth of the bandwidth test instrument detection of the other end connection model DS2400Q of capacitance C1
Signal, the inverting input of operational amplifier A R1 are separately connected one end of ground resistance R2, one end of resistance R3, capacitance C1
One end, the other end of resistance R3, the other end of capacitance C1 are separately connected one end of the output end of operational amplifier A R1, resistance R4,
One end of the other end connection inductance L1 of resistance R4, one end of the grounded capacitance C3 of the other end of inductance L1；
The downlink bandwidth frequency detection circuit includes operational amplifier A R2, and the in-phase input end of operational amplifier A R2 connects respectively
One end of ground capacity C5, one end of resistance R7 are connect, the other end of resistance R7 is separately connected the bandwidth test of model DS2400Q
The photoreceiver bandwidth signal of instrument detection, one end of capacitance C4, the other end of capacitance C4 are separately connected operational amplifier A R2's
Output end, one end of resistance R6, capacitance C6 one end, the reverse phase that the other end of resistance R6 is separately connected operational amplifier A R2 is defeated
Enter end, ground resistance R5 one end, one end of the other end connection grounded inductor L1 of capacitance C3.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820111315.7U CN207782814U (en) | 2018-01-23 | 2018-01-23 | One kind being used for photoreceiver bandwidth adjustment device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820111315.7U CN207782814U (en) | 2018-01-23 | 2018-01-23 | One kind being used for photoreceiver bandwidth adjustment device |
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| CN207782814U true CN207782814U (en) | 2018-08-28 |
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| CN201820111315.7U Active CN207782814U (en) | 2018-01-23 | 2018-01-23 | One kind being used for photoreceiver bandwidth adjustment device |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109194294A (en) * | 2018-09-21 | 2019-01-11 | 河南元祖信息技术有限公司 | Real estate payment is issued licence integrated equipment wisdom terminal system |
| CN109361536A (en) * | 2018-09-30 | 2019-02-19 | 郑州航空工业管理学院 | A kind of Analysis of Network Information system |
| CN112781571A (en) * | 2020-12-30 | 2021-05-11 | 郑州铁路职业技术学院 | Detecting and receiving device for surveying and mapping geographic information signal |
-
2018
- 2018-01-23 CN CN201820111315.7U patent/CN207782814U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109194294A (en) * | 2018-09-21 | 2019-01-11 | 河南元祖信息技术有限公司 | Real estate payment is issued licence integrated equipment wisdom terminal system |
| CN109194294B (en) * | 2018-09-21 | 2022-09-16 | 上海瀚泰智能科技有限公司 | Real estate payment and certificate issuing integrated equipment intelligent terminal system |
| CN109361536A (en) * | 2018-09-30 | 2019-02-19 | 郑州航空工业管理学院 | A kind of Analysis of Network Information system |
| CN112781571A (en) * | 2020-12-30 | 2021-05-11 | 郑州铁路职业技术学院 | Detecting and receiving device for surveying and mapping geographic information signal |
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