CN207664985U - Optical-fiber network rate detection circuit - Google Patents
Optical-fiber network rate detection circuit Download PDFInfo
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- CN207664985U CN207664985U CN201820110372.3U CN201820110372U CN207664985U CN 207664985 U CN207664985 U CN 207664985U CN 201820110372 U CN201820110372 U CN 201820110372U CN 207664985 U CN207664985 U CN 207664985U
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- 239000013307 optical fiber Substances 0.000 title claims abstract description 22
- 238000001514 detection method Methods 0.000 title claims abstract description 12
- 238000012360 testing method Methods 0.000 claims abstract description 6
- 230000005611 electricity Effects 0.000 claims 1
- 230000003287 optical effect Effects 0.000 abstract description 10
- 239000000203 mixture Substances 0.000 abstract description 3
- 238000005516 engineering process Methods 0.000 description 3
- 230000005622 photoelectricity Effects 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 2
- 230000008878 coupling Effects 0.000 description 2
- 238000010168 coupling process Methods 0.000 description 2
- 238000005859 coupling reaction Methods 0.000 description 2
- 210000001367 artery Anatomy 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
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Abstract
The optical-fiber network rate detection circuit of the utility model, including optical-fiber network rate switching frequency circuit, frequency selective network, filter circuit, optical-fiber network rate switching frequency circuit rate of connections selection circuit, frequency selective network connect filter circuit；It efficiently solves and uses tester frequency test signal at present, the signal frequency error tested out is big, the problem of can not achieve effective detection.The rate of optical signal is converted to switching frequency by the utility model photoelectrical coupler, driving triode Q1 is converted into determining switching frequency electric signal, is converted to pulse duration frequency signal through the electric voltage/frequency converter that NE555 chips U2 is core, the frequency signal consistent with pulse duration frequency signal frequency is selected by the frequency selective network of resistance R8, resistance R9 and capacitance C3, capacitance C4 compositions later, bandpass filter most afterwards through capacitance C5, capacitance C6, inductance L1 compositions filters out external interference noise, exports stable frequency signal waveform to tester.
Description
Technical field
The utility model is related to optical-fiber network technical fields, more particularly to optical-fiber network rate detection circuit.
Background technology
Optical-fiber network（Optical Network）Refer generally to the wide area network, the Metropolitan Area Network (MAN) that use optical fiber as prevailing transmission medium
Or newly-built large-scale LAN is realized using RFC2544 testers to optical-fiber network at present in fiber optic communication systems
The rate for receiving optical signal is converted to the switching frequency of electrooptical device, is shown by display screen by rate test and analysis
Out, but the switching frequency of electrooptical device is easily influenced by extraneous frequency interferences, measurement circuit, and not only frequency can be by dry
Generation frequency deviation is disturbed, and the amplitude of frequency signal also decays, causes the signal rate error that tester tests out big, it cannot
Realize effective detection.
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, the utility model to be designed to provide optical-fiber network rate
Detection circuit has and is skillfully constructed and the characteristic of human oriented design, efficiently solves at present using tester test signal frequency
Rate, the signal frequency error tested out is big, the problem of can not achieve effective detection.
Its technical solution solved is, including optical-fiber network rate switching frequency circuit, frequency selective network, filter circuit,
It is characterized in that, optical-fiber network rate switching frequency circuit rate of connections selection circuit, frequency selective network connects filter circuit；
The optical-fiber network rate switching frequency circuit includes photoelectrical coupler U1, and the pin 1 of photoelectrical coupler U1 connects respectively
The other end of one end of connecting resistance R1, one end of capacitance C1, resistance R1 connects power supply+5V, the other end and photoelectricity coupling of capacitance C1
The connection of pin 2 ground of clutch U1, the pin 4 of photoelectrical coupler U1 are separately connected the one end resistance R2, the one end resistance R3, resistance R2's
The other end connects power supply+5V, the base stage of the other end connecting triode Q1 of resistance R3, and the emitter of triode Q1 passes through resistance
R11 connections ground, the connection of pin 3 ground of photoelectrical coupler U1, the collector of triode Q1 are separately connected one end of resistance R4, chip
The pin 2 of U2, the pin 6 of chip U2, the pin 7 of chip U2, one end of ground resistance R5, ground capacity C2 one end, resistance
The other end of R4 connects power supply+5V, and pin 4, the pin 8 of chip U2 are all connected with power supply+5V, the connection of pin 1 ground of chip U2, core
The pin 5 of piece U2 connects the adjustable end of potentiometer RP1, and one end of the upper end connection resistance R6 of potentiometer RP1, resistance R6's is another
End connection power supply+5V, the pin 3 of chip U2 be separately connected the lower end of potentiometer RP1, ground resistance R7 one end.
Preferably, the frequency selective network includes resistance R8, the pin 3 of the upper end connection chip U2 of resistance R8, resistance
The lower end of R8 be separately connected one end of capacitance C3, resistance R10 one end, the other end of capacitance C3 is separately connected the one of resistance R9
It holds, one end of capacitance C4, the other end of resistance R9 connects ground with the other end of capacitance C4；
The filter circuit includes capacitance C5, the other end of one end connection resistance R10 of capacitance C5, the other end of capacitance C5
Be separately connected the upper end of inductance L1, the upper end of capacitance C6, rate test instrument input terminal, under the lower end and capacitance C6 of inductance L1
End is all connected with ground.
The utility model is simple in structure, is skillfully constructed, and the rate of optical signal is converted to switching frequency by photoelectrical coupler, drives
Dynamic triode Q1 is converted into determining switching frequency electric signal, is converted through the electric voltage/frequency converter that NE555 chips U2 is core
For pulse duration frequency signal, selected later by the frequency selective network of resistance R8, resistance R9 and capacitance C3, capacitance C4 compositions and arteries and veins
The consistent frequency signal of frequency signal frequency is rushed, the bandpass filter most formed afterwards through capacitance C5, capacitance C6, inductance L1 filters out outer
Boundary's interference noise exports stable frequency signal waveform to tester, and can effectively solve the problem that frequency is disturbed causes tester to be surveyed
Try out the problem of signal frequency error come is big, and rate can not achieve effective detection.
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, optical-fiber network rate detection circuit, optical-fiber network rate switching frequency circuit receive photoelectrical coupler
Optical signal rate is converted to pulse duration frequency signal, is sent into frequency selective network and selects the frequency consistent with pulse duration frequency signal frequency
Signal, last filtered circuit filter out external interference noise, export stable frequency signal waveform to tester；The optical-fiber network
Rate switching frequency circuit is used to that the rate of optical signal to be converted to switching frequency electric signal by photoelectrical coupler, drives three poles
Pipe Q1 is converted into determining switching frequency electric signal, and pulse is converted to through the electric voltage/frequency converter that NE555 chips U2 is core
Frequency signal, including photoelectrical coupler U1, the pin 1 of photoelectrical coupler U1 be separately connected one end of resistance R1, capacitance C1 one
The other end at end, resistance R1 connects power supply+5V, the other end of capacitance C1 and the connection of pin 2 ground of photoelectrical coupler U1, resistance
R1, capacitance C1 provide stable operating voltage, when receiving tube-launched strong optical signal, photoelectricity for photoelectrical coupler U1
Coupler U1 conductings, since the pin 4 of the connection of pin 3 ground of photoelectrical coupler U1, photoelectrical coupler U1 are connected by resistance R2
The pin 4 of power supply+5V, photoelectrical coupler U1 are low level, the base stage of triode Q1 are connected to by resistance R3, due to triode
The emitter of Q1 passes through resistance R11 connections ground, triode Q1 saturation conductions, resistance R4 and resistance R11 branch pressure voltages（Low level,
The resistance value that resistance R11 resistance values are much smaller than resistance R4 is set）The pin 2 of chip U2, the pin 6 of chip U2, chip U2 is added to draw
Foot 7, otherwise, when receiving tube-launched faint optical signal, high level is added to the pin 2 of chip U2, chip U2 draws
The pin 7 of foot 6, chip U2, chip U2, resistance R5, capacitance C2, potentiometer RP1, resistance R6, resistance R7 component frequency voltages turn
Change circuit, 3 Output pulse frequency signal of pin of chip U2.
Embodiment two, on the basis of embodiment one, the frequency selective network is for selecting and pulse duration frequency signal frequency
The consistent frequency signal of rate allows pulse duration frequency signal to rear class circuit transmission, and the other frequency signals interfered filter out, and wraps
Resistance R8 is included, resistance R8, capacitance C3, resistance R9, capacitance C4 form RC frequency-selective networks, select single-frequency signals, regulation resistance
The size of frequency is adjusted in the size of any value in R8, capacitance C3, resistance R9, capacitance C4；The filter circuit is outer for filtering out
Boundary's interference noise, including capacitance C5, capacitance C5, inductance L1, capacitance C6 form bandwidth-limited circuit, frequency selective network are allowed to select
The pulse duration frequency signal gone out passes through, and filters out external interference noise, and the input terminal of frequency rate tester exports stable frequency letter
Number waveform is to tester.
When the utility model is specifically used, when receiving tube-launched strong optical signal, photoelectrical coupler U1 conductings,
Since the pin 4 of the connection of pin 3 ground of photoelectrical coupler U1, photoelectrical coupler U1 pass through resistance R2 connection power supply+5V, photoelectricity coupling
The pin 4 of clutch U1 is low level, the base stage of triode Q1 is connected to by resistance R3, since the emitter of triode Q1 passes through
Resistance R11 connections ground, triode Q1 saturation conductions, resistance R4 and resistance R11 branch pressure voltages（Resistance R11 resistance values are arranged in low level
Much smaller than the resistance value of resistance R4）Be added to the pin 2 of chip U2, the pin 6 of chip U2, chip U2 pin 7 otherwise work as reception
When to tube-launched faint optical signal, high level is added to the pin of the pin 2 of chip U2, the pin 6 of chip U2, chip U2
7, chip U2, resistance R5, capacitance C2, potentiometer RP1, resistance R6, resistance R7 component frequency voltage conversion circuits, chip U2's draws
3 Output pulse frequency signal of foot forms RC frequency-selective networks into resistance R8, capacitance C3, resistance R9, capacitance C4, selects single frequency
Rate signal, the size of any value in regulation resistance R8, capacitance C3, resistance R9, capacitance C4, is adjusted the size of frequency, most passes through afterwards
Capacitance C5, inductance L1, capacitance C6 form bandwidth-limited circuit, and the pulse duration frequency signal that frequency selective network is selected is allowed to pass through,
External interference noise is filtered out, the input terminal of frequency rate tester exports stable frequency signal waveform to tester.
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. optical-fiber network rate detection circuit, including optical-fiber network rate switching frequency circuit, frequency selective network, filter circuit,
It is characterized in that, optical-fiber network rate switching frequency circuit rate of connections selection circuit, frequency selective network connects filter circuit；
The optical-fiber network rate switching frequency circuit includes photoelectrical coupler U1, and the pin 1 of photoelectrical coupler U1 is separately connected electricity
One end of R1, one end of capacitance C1 are hindered, the other end of resistance R1 connects power supply+5V, the other end and photoelectrical coupler of capacitance C1
The connection of pin 2 ground of U1, the pin 4 of photoelectrical coupler U1 are separately connected the one end resistance R2, the one end resistance R3, and resistance R2's is another
End connection power supply+5V, the base stage of the other end connecting triode Q1 of resistance R3, the emitter of triode Q1 are connected by resistance R11
Ground connection, the connection of pin 3 ground of photoelectrical coupler U1, the collector of triode Q1 are separately connected one end of resistance R4, chip U2
Pin 2, the pin 6 of chip U2, the pin 7 of chip U2, one end of ground resistance R5, ground capacity C2 one end, resistance R4's
The other end connects power supply+5V, and pin 4, the pin 8 of chip U2 are all connected with power supply+5V, the connection of pin 1 ground of chip U2, chip U2
Pin 5 connect the adjustable end of potentiometer RP1, one end of the upper end connection resistance R6 of potentiometer RP1, the other end of resistance R6 connects
Meet power supply+5V, the pin 3 of chip U2 be separately connected the lower end of potentiometer RP1, ground resistance R7 one end.
2. optical-fiber network rate detection circuit as described in claim 1, which is characterized in that the frequency selective network includes resistance
The pin 3 of the upper end connection chip U2 of R8, resistance R8, the lower end of resistance R8 be separately connected one end of capacitance C3, resistance R10 one
End, the other end of capacitance C3 be separately connected one end of resistance R9, capacitance C4 one end, the other end of resistance R9 and capacitance C4's is another
One end connection ground；
The filter circuit includes capacitance C5, the other end of one end connection resistance R10 of capacitance C5, the other end difference of capacitance C5
Connect the upper end of inductance L1, the upper end of capacitance C6, rate test instrument input terminal, the lower end of inductance L1 and the lower end of capacitance C6 are equal
Connection ground.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820110372.3U CN207664985U (en) | 2018-01-23 | 2018-01-23 | Optical-fiber network rate detection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820110372.3U CN207664985U (en) | 2018-01-23 | 2018-01-23 | Optical-fiber network rate detection circuit |
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| CN207664985U true CN207664985U (en) | 2018-07-27 |
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| CN201820110372.3U Active CN207664985U (en) | 2018-01-23 | 2018-01-23 | Optical-fiber network rate detection circuit |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110233780A (en) * | 2019-07-30 | 2019-09-13 | 漯河医学高等专科学校 | A kind of computer network signal supervisory instrument |
| CN112565942A (en) * | 2020-12-15 | 2021-03-26 | 安徽皖通邮电股份有限公司 | Equipment self-package sending method based on optical transport network |
-
2018
- 2018-01-23 CN CN201820110372.3U patent/CN207664985U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110233780A (en) * | 2019-07-30 | 2019-09-13 | 漯河医学高等专科学校 | A kind of computer network signal supervisory instrument |
| CN112565942A (en) * | 2020-12-15 | 2021-03-26 | 安徽皖通邮电股份有限公司 | Equipment self-package sending method based on optical transport network |
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