CN204597972U - Optical fiber communication experimental optical sending module - Google Patents
Optical fiber communication experimental optical sending module Download PDFInfo
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- CN204597972U CN204597972U CN201520307839.XU CN201520307839U CN204597972U CN 204597972 U CN204597972 U CN 204597972U CN 201520307839 U CN201520307839 U CN 201520307839U CN 204597972 U CN204597972 U CN 204597972U
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Abstract
The utility model embodiment provides a kind of optical fiber communication experimental optical sending module, comprise: adjustable bias current output circuit, adjustable modulation current output circuit, see-saw circuit, semiconductor laser tube and common emitter amplifying circuit, described adjustable bias current output circuit is in parallel with described adjustable modulation current output circuit; The modulated current that the bias current exported by adjustable bias current output circuit and adjustable modulation current output circuit export is combined into a road electric current, is input to described see-saw circuit; And electric current amplifies output through described see-saw circuit, is input to the anode of described semiconductor laser tube, send light signal for output for exciting described semiconductor laser tube.Optical fiber communication experimental optical sending module in the utility model can regulate modulated current and bias current independently respectively, and optionally regulation output analog-modulated electric current and digital modulation electric current.
Description
Technical field
The utility model belongs to technical field of optical fiber communication, particularly relates to a kind of optical fiber communication experimental optical sending module.
Background technology
Optical fiber communication utilizes fiber optic transmission signal, to realize a kind of communication mode that information is transmitted.Optical fiber communication is compared with telecommunication, have the following advantages: transmission frequency bandwidth, loss are low, loss evenly and not by temperature impact, antijamming capability is strong and fidelity is high, the host-host protocol of the high speed serialization ability that it adopts, has high reliability, high bandwidth, feature that real-time is high.Just so, optical fiber telecommunications system becomes major flow communication system gradually.
At present, China has built up backbone network based on fiber optic network and metropolitan area network.Along with the propelling that local fiber network and 4G mobile communication fiber optic network are built, the fiber optic communication field of China also has very large development space.Thus the be correlated with demand of the talent of optical fiber communication is also increasing, and each colleges and universities also pay attention to for optical fiber communication education thereupon.Along with each colleges and universities offering optical fiber communication experimental courses, the experimental facilities demand of associated optical fiber communication is also increasing, larger for the light transmitting terminal demand of testing the high optical fiber communication experimental facilities of exploitability.
Wherein, the light transmitting terminal of current optical fiber communication experiment is just made up of digital light transmitter driving circuit and simulated light transmitter driving circuit.By selector switch, the Optical Fiber Transmission of analog signal or digital signal can only be completed separately, can not output offset electric current or modulated current separately.
Utility model content
In view of this, the utility model embodiment object is to provide a kind of novel optical fiber communication experimental optical sending module.
The utility model embodiment provides a kind of optical fiber communication experimental optical sending module, comprise: adjustable bias current output circuit, adjustable modulation current output circuit, see-saw circuit, semiconductor laser tube and common emitter amplifying circuit, wherein: described adjustable bias current output circuit is in parallel with described adjustable modulation current output circuit; The modulated current that the bias current exported by described adjustable bias current output circuit and described adjustable modulation current output circuit export is combined into a road electric current, is input to described see-saw circuit; And electric current amplifies output through described see-saw circuit, is input to the anode of described semiconductor laser tube, send light signal for output for exciting described semiconductor laser tube.
Further, described adjustable bias current output circuit comprises three-terminal voltage regulator and potentiometer 1, and described potentiometer 1 is connected to the reference voltage pin place of described three-terminal voltage regulator.
Further, described adjustable modulation current output circuit comprise for receiving digital signals data collector and be connected to the potentiometer 2 of data collector output.
Further, the sensing point of the input being positioned at data collector is also comprised.
Further, described data collector is ternary output octal data transceiver.
Further, described optical transmission module also comprises the sensing point being positioned at adjustable modulation current output circuit output.
Further, the quantity of described see-saw circuit is at least two, amplifies output be provided with sensing point in see-saw circuit at different levels.
Further, described optical transmission module also comprises the sensing point of the anode tap being positioned at described semiconductor laser tube and is positioned at the sensing point of cathode terminal of described semiconductor laser tube.
Further, described optical transmission module also comprises the sensing point between the dividing potential drop protective resistance and power supply of described semiconductor laser tube.
Further, power supply coupling capacitor is all arranged in described adjustable bias current output circuit, described adjustable modulation current output circuit, described see-saw circuit and described common emitter amplifying circuit positive pole input.
Optical fiber communication experimental optical sending module in the utility model can regulate modulated current and bias current independently respectively, and optionally regulation output analog-modulated electric current and digital modulation electric current.
Accompanying drawing explanation
Fig. 1 is the structural representation of optical fiber communication experimental optical sending module of the present utility model;
Fig. 2 is the circuit theory diagrams of optical fiber communication experimental optical sending module of the present utility model.
Drawing reference numeral illustrates:
1, adjustable bias current output circuit; 2, adjustable modulation current output circuit;
31, potentiometer 1; 32, potentiometer 2;
41, first order see-saw circuit; 42, second level see-saw circuit;
43, third level see-saw circuit; 51-59, sensing point;
6, common emitter amplifying circuit; 7, reference resistance; 8, semiconductor laser tube.
Embodiment
Below in conjunction with accompanying drawing in the utility model embodiment, be clearly and completely described the technical scheme in the utility model embodiment, obviously, described embodiment is only the utility model part embodiment, instead of whole embodiments.The assembly of the utility model embodiment describing and illustrate in usual accompanying drawing herein can be arranged with various different configuration and design.
Refer to Fig. 1 and Fig. 2, the utility model embodiment provides a kind of optical fiber communication experimental optical sending module 10, comprising: adjustable bias current output circuit 1, adjustable modulation current output circuit 2, multistage see-saw circuit 41-43, common emitter amplifying circuit 6, reference resistance 7 and semiconductor laser tube 8.
Concrete, in the present embodiment, described adjustable bias current output circuit 1 is in parallel with adjustable modulation current output circuit 2, the modulated current that the bias current exported by adjustable bias current output circuit 1 and adjustable modulation current output circuit 2 export, also tie-point in this two output circuit is combined into a road electric current, be input to described multistage see-saw circuit 41-43, electric current amplifies output through described multistage see-saw circuit 41-43, be input to the anode of described semiconductor laser tube 8, described semiconductor laser tube 8 is excited to send light signal, light signal transmits through described optical fiber pigtail.
Concrete, in the present embodiment, multistage see-saw circuit 41-43 comprises first order see-saw circuit 41, second level see-saw circuit 42 and third level see-saw circuit 43; Wherein, electric current enters through the inverting input of first order see-saw circuit 41, first order see-saw circuit 41 output gain amplifies after-current subsequently, this electric current part returns first order see-saw circuit 41 inverting input as negative feedback current, promote the stability of gain amplification and prevent from exporting distortion, gain is amplified after-current major part and is transmitted to second level see-saw circuit 42.Circuit is the same with above-mentioned first order see-saw circuit 41 at the transport process of second level see-saw circuit 42, third level see-saw circuit 43.Through three grades of see-saw circuits, finally from the gain amplified current of third level see-saw circuit 43 stable output.
Further, power supply coupling capacitor is all arranged in each element and circuit anode input, can prevent vibration, and impulsive noise is switched to ground; Can play energy storage effect in addition, can prevent circuit power consumption from increasing suddenly, supply voltage moment is dragged down, and produces noise and ring.
Further, adjustable bias current output circuit 1 comprises three-terminal voltage regulator and potentiometer 1, and potentiometer 1 is connected to the reference voltage pin place of three-terminal voltage regulator, and the input of adjustable bias current output circuit 1 power supply is connected to power supply coupling capacitor in addition.
Further, adjustable modulation current circuit 2, can using digital signal as modulated current by metal optical cable input incoming digital signal, thus the selection realizing analog-modulated electric current and digital modulation electric current exports.
Further, in the present embodiment, optical transmission module 10 also comprises multiple sensing point 51-59, concrete, please refer to Fig. 1 and Fig. 2:
Wherein, sensing point 51 is positioned at adjustable modulation current output circuit 2 input, by sensing point 51, can carry out analog signal and digital signal input signal is observed to the metal optical cable input in adjustable modulation current output circuit 2;
Sensing point 52 is positioned at adjustable modulation current output circuit 2 output, by sensing point 52, the signal observation of modulated current can be carried out to adjustable modulation current output circuit 2 output, contrast with sensing point 51 signal simultaneously, reach inspection effect, adjustable potentiometer 2 carries out the adjustment of modulated current in addition;
Sensing point 53 is positioned at adjustable bias current output circuit 1 output, by sensing point 53, can carry out signal observation to adjustable bias current output circuit 1 output, understands the change of bias current, and adjustable potentiometer 2 carries out the adjustment of bias current simultaneously;
Sensing point 54 is positioned at first order see-saw circuit 41 output, sensing point 55 is positioned at second level see-saw circuit 42 output, sensing point 56 is positioned at third level see-saw circuit 43 output, by sensing point 54, sensing point 55, sensing point 56, output can be amplified to see-saw circuit 41-43 at different levels and carry out signal observation, understand the signal magnification ratio of inverting amplifier 41-43 at different levels, the gain performance inspection effect to inverting amplifier 41-43 at different levels can be played simultaneously, for digital signal, the wave form varies of observable signal;
Sensing point 57 is positioned at common emitter amplifying circuit 6 output, sensing point 58 is between semiconductor laser tube 8 and reference resistance 7, by sensing point 57, sensing point 58, signal observation can be carried out to semiconductor laser tube 8 dividing potential drop reference resistance 7 two ends, and by calculating the excitation current of known semiconductor laser tube 8, thus can be related experiment such as carrying out laser threshold current data is provided, ensure that semiconductor laser tube 8 is operated in rational current range simultaneously, play ensureing and safeguard and inspection effect;
Sensing point 59 is positioned at semiconductor laser tube 8 cathode terminal, and each sensing point 51-59 can play signal and observe and channel check effect; By sensing point 58, sensing point 59, signal observation can be carried out to semiconductor laser tube 8 anode tap and semiconductor laser tube 8 cathode terminal two ends, semiconductor laser tube 8 voltage can be measured, ensure that semiconductor laser tube 8 is operated within the scope of reasonable voltage simultaneously.
Further, all with negative-feedback circuit in see-saw circuit 41-43 at different levels, negative-feedback circuit can play raising gain stability, reduces nonlinear distortion, suppresses the effect of noise in feedback loop.
Further, the optical transmission module 10 that the present embodiment provides also comprises potentiometer 1 and potentiometer 2, and potentiometer 1 is positioned at the output of adjustable bias current output circuit 1, and potentiometer 2 is positioned at the output of adjustable modulation current output circuit 2.Wherein, turn clockwise potentiometer 2 time, modulated current can be made to reduce, minimumly can be 0 peace (A), turn clockwise potentiometer 1 time, bias current can be made to reduce, minimumly can be 0 peace (A).
Optical transmission module 10 in the present embodiment, when coming into operation, carries out according to the following step:
The first step, inspection, debug circuit: whether the signal wiring of inspection adjustable bias current output circuit 1, adjustable modulation current output circuit 2, sensing point 51-59, multistage see-saw circuit 41-43, semiconductor laser tube 8, power circuit is normal, if there is exception, corrected.
Second step, add electric test equipment: start power supply, confirm that semiconductor laser tube 8 drive current does not exceed 30 milliamperes (mA), confirm optical biasing and modulated current adjustable, whether optical fiber communication experiment optical transmission module operating state is normal, just comes into operation after normal.
The utility model can regulate separately modulated current and bias current: by regulating bias current, makes semiconductor laser tube 8 be operated in suitable direct current biasing point; By regulating modulated current, the output optical signal of semiconductor laser tube 8 is made to carry modulation intelligence.
Such as, when carrying out the test of P-I-V curve, owing to not needing load information, by regulator potentiometer 2, separately modulated current is adjusted to 0A, then regulates bias current separately, and when recording different bias currents, the Output optical power of semiconductor laser tube 8 and bias voltage, complete the test of P-I-V curve;
Under being the condition of zero at bias current, when carrying out modulated current to the impact of output optical signal experiment, by regulator potentiometer 1, separately bias current is adjusted to 0A, then modulated current is regulated separately, and when recording different modulating electric current, the Output optical power of semiconductor laser tube 8 and voltage;
Under keep certain condition at modulated current, when carrying out bias current to the impact of output optical signal experiment, by regulator potentiometer 2, separately modulated current is adjusted to certain current value, then bias current is regulated separately, and when recording different bias currents, the Output optical power of semiconductor laser tube 8 and bias voltage;
Under keep certain condition at bias current, carry out modulated current to test the impact of output optical signal, by regulator potentiometer 1, separately bias current is adjusted to certain current value, then modulated current is regulated separately, and when recording different modulating electric current, the Output optical power of semiconductor laser tube 8 and voltage.
Further, in the present embodiment, semiconductor laser tube 8 tail optical fiber is by access light power meter, average light power and extinction ratio experiment can be realized: the connector of semiconductor laser tube 8 tail optical fiber is inserted light power meter, open light power meter, arranging light power meter measurement wavelength is 1550nm, can measure the average light power P of semiconductor laser tube 8.
In sum, compared with the light transmitting terminal of existing fiber communication experiment case, the utility model has following beneficial effect:
1. the light transmitting terminal of the optical fiber communication experiment of prior art is just merely defined as the transmit block of light signal, the external relative closure of light transmitting terminal interior lights signal, cannot effectively observe light signal transmitting terminal internal signal, thus the transmission situation of light transmitting terminal light signal at different levels can not be known, cannot realize fast optical receiving end inspection and maintenance.Scheme of the present utility model arranges multistage sensing point 51-59, effectively observes signal at different levels, helps to understand the problems in teaching such as signal amplification, Signal transmissions and laser threshold, can realize fast to channel check at different levels and maintenance simultaneously, have durability with maintainable;
2. modulated current and bias current all can save by Independent adjustable, current stabilization without High-frequency Interference, optionally regulation output analog-modulated electric current and digital modulation electric current;
3. structure understands, experimental implementation is strong, independently can form optical-fiber laser and send related experiment, and light power meter only need be coordinated operate lasers P-I characteristic, average light power and extinction ratio to test, and experimental implementation is strong.
Although more employ circuit Essential Terms herein, do not get rid of the possibility using other term.These terms are used to be only used to describe and explain essence of the present utility model more easily; The restriction that they are construed to any one additional is all contrary with the utility model spirit.
Claims (10)
1. an optical fiber communication experimental optical sending module, is characterized in that, comprising: adjustable bias current output circuit, adjustable modulation current output circuit, see-saw circuit, semiconductor laser tube and common emitter amplifying circuit, wherein:
Described adjustable bias current output circuit is in parallel with described adjustable modulation current output circuit;
The modulated current that the bias current exported by described adjustable bias current output circuit and described adjustable modulation current output circuit export is combined into a road electric current, is input to described see-saw circuit; And
Electric current amplifies output through described see-saw circuit, is input to the anode of described semiconductor laser tube, sends light signal for output for exciting described semiconductor laser tube.
2. optical fiber communication experimental optical sending module according to claim 1, it is characterized in that, described adjustable bias current output circuit comprises three-terminal voltage regulator and potentiometer 1, and described potentiometer 1 is connected to the reference voltage pin place of described three-terminal voltage regulator.
3. optical fiber communication experimental optical sending module according to claim 1, is characterized in that, described adjustable modulation current output circuit comprise for receiving digital signals data collector and be connected to the potentiometer 2 of data collector output.
4. optical fiber communication experimental optical sending module according to claim 3, is characterized in that, also comprise the sensing point of the input being positioned at data collector.
5. optical fiber communication experimental optical sending module according to claim 3, is characterized in that, described data collector is ternary output octal data transceiver.
6. optical fiber communication experimental optical sending module according to claim 1, is characterized in that, also comprises the sensing point being positioned at adjustable modulation current output circuit output.
7. optical fiber communication experimental optical sending module according to claim 1, it is characterized in that, the quantity of described see-saw circuit is at least two, amplifies output be provided with sensing point in see-saw circuit at different levels.
8. optical fiber communication experimental optical sending module according to claim 1, is characterized in that, the sensing point of the sensing point also comprising the anode tap being positioned at described semiconductor laser tube and the cathode terminal that is positioned at described semiconductor laser tube.
9. optical fiber communication experimental optical sending module according to claim 1, is characterized in that, also comprises the sensing point between the dividing potential drop protective resistance and power supply of described semiconductor laser tube.
10. optical fiber communication experimental optical sending module according to claim 1, it is characterized in that, power supply coupling capacitor is all arranged in described adjustable bias current output circuit, described adjustable modulation current output circuit, described see-saw circuit and described common emitter amplifying circuit positive pole input.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520307839.XU CN204597972U (en) | 2015-05-13 | 2015-05-13 | Optical fiber communication experimental optical sending module |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201520307839.XU CN204597972U (en) | 2015-05-13 | 2015-05-13 | Optical fiber communication experimental optical sending module |
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| CN204597972U true CN204597972U (en) | 2015-08-26 |
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| CN201520307839.XU Expired - Fee Related CN204597972U (en) | 2015-05-13 | 2015-05-13 | Optical fiber communication experimental optical sending module |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107317650A (en) * | 2017-07-03 | 2017-11-03 | 华南师范大学 | Device, method and system for time-division division multiplex fibre-optic communication wave experimental teaching |
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2015
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107317650A (en) * | 2017-07-03 | 2017-11-03 | 华南师范大学 | Device, method and system for time-division division multiplex fibre-optic communication wave experimental teaching |
| CN107317650B (en) * | 2017-07-03 | 2019-04-19 | 华南师范大学 | Device, method and system for time-division division multiplex fibre-optic communication wave experimental teaching |
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| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20150826 Termination date: 20160513 |
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| CF01 | Termination of patent right due to non-payment of annual fee |