CN201122374Y - Wavelength division multiplexing optical fiber communication experiment demonstration instrument - Google Patents
Wavelength division multiplexing optical fiber communication experiment demonstration instrument Download PDFInfo
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- CN201122374Y CN201122374Y CNU2007201921964U CN200720192196U CN201122374Y CN 201122374 Y CN201122374 Y CN 201122374Y CN U2007201921964 U CNU2007201921964 U CN U2007201921964U CN 200720192196 U CN200720192196 U CN 200720192196U CN 201122374 Y CN201122374 Y CN 201122374Y
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Abstract
The utility model discloses an experiment demonstration instrument for wavelength division multiplexing fiber optic communication. Electric signals of analog signals, audio signals and digital signals are transformed into optical signals through an electric signal input socket, an electro-optical modulation circuit and a light emitting diode, the optical signals are focused at a multimode plastic fiber port via a first focusing lens, and transformed into parallel light beams via a second focusing lens after being transmitted by the optical fiber, light splitting is performed to the optical signals by reflecting grating, then the optical signals are focused to an isolation light aperture via a third focusing lens, and are transformed into electric signals via a light-sensitive sensor, and the electric signals are transmitted to a signal output socket through a preamplifier circuit and a power amplifying circuit. The experiment demonstration instrument has the advantages that the experiment demonstration instrument is used for teaching and experiments, can demonstrate the principle of the wavelength division multiplexing fiber optic communication technology, and can overcome the problems that the experiment demonstration instrument is associated with the actual technology, but is not suitable for the teaching demonstration, and the wavelength division multiplexing technology experiment demonstration instrument produced by applying the structure can intuitively demonstrate the overall process of communication and transmission in the optical communication theoretical teaching in colleges and universities or in the popular science teaching in primary and middle schools, to ensure the communication technology for wavelength division multiplexing to be popularized.
Description
Technical field
The utility model relates to optical fiber communication, relates in particular to a kind of division multiplex fibre-optic communication wave experimental demonstration instrument.
Background technology
Optical communication field wave division multiplexing WDM (wavelength division multiplex) technology, be that optical carrier (carrying various information) with two or more different wave lengths merges together through multiplexer at transmitting terminal, and be coupled to the technology of transmitting in the same optical fiber on the optical link; At receiving end, separate through the light carrier of demodulation multiplexer various wavelength, be for further processing to recover original signal by photoreceiver then.This technology of transmitting two or numerous different wave length light signals in same optical fiber simultaneously is called wavelength-division multiplex.In the actual light communications applications technology, article one, information transmitted is thousands of in the optical fiber, use therein carrier wave light source is generally the infrared laser light source that wavelength is 1310nm or 1550nm, signal is many to be transmitted with digitally coded form, the optical fiber of transmission signals considers that long factor apart from loss often adopts quartzy single-mode fiber, the multiplexer of carrier signal and demodulation multiplexer are general at present to adopt array waveguide grating (AWG), and special optical fiber coupling device is arranged.
But problem that be not suitable for experimental demonstration relevant with actual techniques has: 1, many signals electrooptic modulator circuit complexity, cost of manufacture height; 2, the optical carrier source needs tunable infrared laser, the equipment cost height, and light is invisible; 3, Transmission Fibers is the single mode silica fibre, needs the special signal coupling mechanism, the cost of manufacture height, and transmission signals is invisible; 4, multiplexer and demodulation multiplexer, array waveguide grating (AWG) volume is little, structure is meticulous, is not suitable for observing on the principle; 5, total system complex structure, mechanism huge, cost an arm and a leg, can not be used for teaching or experimental demonstration.
Summary of the invention
The purpose of this utility model provide a kind of simple in structure, make division multiplex fibre-optic communication wave experimental demonstration instrument easy, with low cost, demonstrating visual.
Simulation in the division multiplex fibre-optic communication wave experimental demonstration instrument, audio frequency, digital three road electric signal are imported socket, electrooptical modulating circuit, light emitting diode by electric signal and are become light signal, optical signals first condenser lens focuses on multimode plastic optical fiber port, after Optical Fiber Transmission, change parallel beam into by second condenser lens, by the reflection grating beam split, focus to the isolation unthreaded hole through the 3rd condenser lens, transfer electric signal to by light sensor again, electric signal through pre-amplification circuit, power amplification circuit to the signal output socket.
It is the multimode plastic optical fiber of 2mm that described optical fiber adopts diameter.First condenser lens is a microcobjective.Light emitting diode is red, green, blue three look Led.The microcobjective interface is provided with the red, green, blue three look Led of rounded projections arranged.Reflection grating is 1200 lines/mm plane reflection grating.
The utility model is used for teaching and experiment, can demonstrate the principle of this optical communication technique of wavelength-division multiplex, the formation of demonstrator has overcome relevant with actual techniques but has been not suitable for the problem of teaching demonstration, use this kind structure fabrication the wavelength-division multiplex technique teaching experimental can the optical communication theory teaching of institution of higher education or in, the overall process of demonstration communication intuitively in primary school's science popularization teaching, transmission, make the communication technology universalness of wavelength-division multiplex.
Description of drawings
Fig. 1 is a division multiplex fibre-optic communication wave experimental demonstration instrument structural representation;
Fig. 2 is light emitting diode of the present utility model, first condenser lens, multimode plastic optical fiber structural representation;
Among the figure: electric signal input socket 1, electrooptical modulating circuit 2, light emitting diode 3, first condenser lens 4, multimode plastic optical fiber 5, second condenser lens 6, reflection grating 7, the 3rd condenser lens 8, isolation unthreaded hole 9, light sensor 10, pre-amplification circuit 11, power amplification circuit 12, signal output socket 13.
Embodiment
As Fig. 1,2 is described, simulation in the division multiplex fibre-optic communication wave experimental demonstration instrument, audio frequency, numeral three road electric signal are by electric signal input socket 1, electrooptical modulating circuit 2, light emitting diode 3 becomes light signal, optical signals first condenser lens 4 focuses on multimode plastic optical fiber 5 ports, after optical fiber 5 transmission, change parallel beam into by second condenser lens 6, by reflection grating 7 beam split, focus to isolation unthreaded hole 9 through the 3rd condenser lens 8, transfer electric signal to by light sensor 10 again, electric signal is through pre-amplification circuit 11, power amplification circuit 12 is to signal output socket 13.
It is the multimode plastic optical fiber of 2mm that described optical fiber 5 adopts diameter.First condenser lens 4 is a microcobjective.Light emitting diode 3 is red, green, blue three look Led.The microcobjective interface is provided with the red, green, blue three look Led of rounded projections arranged.Reflection grating 7 is 1200 lines/mm plane reflection grating.
The utility model adopts red, green, and the light emitting diode of blue three-color (LED) is modulated respectively three kinds of different signals of sound signal, voice signal and switch (numeral) signal as modulated light source.Three light sources are pressed certain angle and are arranged, through short focal length lens optically focused, place the input end of optical fiber on focal point.Composite optical signal is after Optical Fiber Transmission, earlier convert emergent light to parallel beam at output terminal by convex lens, through grating complex light is opened by the different wave length chromatic dispersion again, by another convex lens three-beam is focused on, through isolating unthreaded hole, make the three-beam interference-free be restored out by the light sensor demodulation respectively at the focus place.
Method for making of the present utility model is:
1. the electrooptical modulation of three tunnel exemplary electrical signal (simulation, audio frequency, numeral)
Adopt in the making of demonstrator three tunnel typical electric signal are carried out electrooptical modulation, (a) simulating signal; (b) sound signal; (c) digital signal.With electrical signal conversion is the most basic modulation circuit of light signal, and what adopt here is the method for direct sunshine modulation, and this method is exactly the drive current with the direct modulated luminescence diode of electric signal, and the output light intensity is realized with change in electric.This scheme technology is simple, and cost is lower, realizes easily.If will modulate AC signal,, play the effect of stopping direct current at electric capacity of input end serial connection.
2. with the carrier wave light source of the Led that launches red, green, blue three coloured light as transmission signals
Adopted the red, green, blue three-color LED as the carrier wave light source in the making.Relatively use LASER Light Source, led light source has taken bigger bandwidth.But the LASER Light Source that is used for optical communication often is infrared band, belong to invisible light, and price is not suitable as the light source of demonstrator than the LED height.This experiment instrument has adopted red, green, blue three-color LED light as the carrier wave light source.Though because the bandwidth that they take separately big (for about 50nm), it is far away that this three coloured light wavelength is separated by, and do not influence between this three coloured light of carrier as three road signals.Secondly led light source is a visible light, seems more directly perceived as the light source of demonstrator.
3. utilize short focal length microcobjective to focus on the mode of coupling with signal coupled into optical fibres end face
Utilize the optically focused principle of convex lens during this experiment instrument is made, will be converged to a bit through convex lens from the light that LED sends, and this point is dropped on the end face of optical fiber, carried out the coupling of multiple beam.
4. adopting diameter is the transmission of the multimode plastic optical fiber of 2mm as the Transmission Fibers realization signal of demonstrator
Focus on the utilization of coupling technique for fit lens, need to select fibre diameter thicker optical fiber relatively, it is the Transmission Fibers of the multimode plastic optical fiber of 2mm as experiment instrument that present technique is selected diameter for use, its advantage has: (1) coupling easily, as long as the spot diameter of three road light focusings is about 1mm, luminous energy just can major part enter optical fiber, and contraposition is easy; (2) end face is handled conveniently, behind fiber cut, only needs polish the loss that just can reduce luminous energy slightly to end face; (3) the plastic optical fiber scattering loss is big than silica fibre, can observe the light of transmission from optical fiber side, the demonstration of favourable and transmission course; (4) 2mm plastic optical fiber rupture strength is big, and is not fragile.
5. utilize reflection grating diffraction light splitting technology with three kinds of signal chromatic dispersions to different locus
The demultiplexing device has then adopted the plane reflection grating in the technology, after incident illumination was mapped on the grating, because the angular dispersion effect of grating, wavelength optical signals was with different angle reflections, converge to different locus through lens then, thereby finish wavelength selection function.Grating will carry out beam split to R, G, B three coloured light from the optical fiber outgoing, and reflex to different angles, carry out the demultiplexing of signal.The plane reflection grating that uses in the present technique is 1200 lines/mm grating.
6. by isolating unthreaded hole, receive the light intensity signal of each wavelength light source by three light sensors, after opto-electronic conversion, finish separating of signal and be in harmonious proportion and restore
Make the three-beam behind grating beam splitting can be received the machine reception with not influencing each other, need behind grating, to add a condenser lens, make from the directional light of grating outgoing and focus on the photoreceiver, because of the locus of three-beam focus point very approaching, and the photoreceiver volume is bigger, so need add the isolation unthreaded hole before receiving sensor.The isolation unthreaded hole from left to right is followed successively by the light hole of red, green, blue.Spacing is 5cm between wherein red green two holes, is 2.5cm between turquoise two holes.The size of back photodiode is 10cm*10cm.The employing stepped construction is placed, and middle photodiode is stacked in below the left and right photodiode.
Claims (6)
1, a kind of division multiplex fibre-optic communication wave experimental demonstration instrument, it is characterized in that simulation, audio frequency, numeral three road electric signal are imported socket (1) by electric signal, electrooptical modulating circuit (2), light emitting diode (3) becomes light signal, optical signals first condenser lens (4) focuses on multimode plastic optical fiber (5) port, after optical fiber (5) transmission, change parallel beam into by second condenser lens (6), by reflection grating (7) beam split, focus to isolation unthreaded hole (9) through the 3rd condenser lens (8), transfer electric signal to by light sensor (10) again, electric signal is through pre-amplification circuit (11), power amplification circuit (12) is to signal output socket (13).
2, a kind of division multiplex fibre-optic communication wave experimental demonstration instrument according to claim 1 is characterized in that it is the multimode plastic optical fiber of 2mm that described optical fiber (5) adopts diameter.
3, a kind of division multiplex fibre-optic communication wave experimental demonstration instrument according to claim 1 is characterized in that described first condenser lens 4) be microcobjective.
4, a kind of division multiplex fibre-optic communication wave experimental demonstration instrument according to claim 1 is characterized in that described light emitting diode (3) is red, green, blue three look Led.
5,, it is characterized in that described microcobjective interface is provided with the red, green, blue three look Led of rounded projections arranged according to claim 3 or 4 described a kind of division multiplex fibre-optic communication wave experimental demonstration instrument.
6, a kind of division multiplex fibre-optic communication wave experimental demonstration instrument according to claim 1 is characterized in that described reflection grating (7) is 1200 lines/mm plane reflection grating.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2007201921964U CN201122374Y (en) | 2007-11-01 | 2007-11-01 | Wavelength division multiplexing optical fiber communication experiment demonstration instrument |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2007201921964U CN201122374Y (en) | 2007-11-01 | 2007-11-01 | Wavelength division multiplexing optical fiber communication experiment demonstration instrument |
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| Publication Number | Publication Date |
|---|---|
| CN201122374Y true CN201122374Y (en) | 2008-09-24 |
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| CNU2007201921964U Expired - Fee Related CN201122374Y (en) | 2007-11-01 | 2007-11-01 | Wavelength division multiplexing optical fiber communication experiment demonstration instrument |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2011104721A1 (en) * | 2010-02-23 | 2011-09-01 | Hitesh Mehta | Device, system and method for fiber optic training kit |
| CN102820927A (en) * | 2012-08-23 | 2012-12-12 | 安徽省科普产品工程研究中心有限责任公司 | Analog optical-fiber channel device and analog optical-fiber channel method |
| CN103036619A (en) * | 2012-12-21 | 2013-04-10 | 中国电力科学研究院 | Single-core optical transceiver and single-core optical transmission intelligent communication module and application thereof |
| CN105761592A (en) * | 2016-04-15 | 2016-07-13 | 中国科学院上海技术物理研究所 | Visible light communication demonstration teaching aid |
-
2007
- 2007-11-01 CN CNU2007201921964U patent/CN201122374Y/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2011104721A1 (en) * | 2010-02-23 | 2011-09-01 | Hitesh Mehta | Device, system and method for fiber optic training kit |
| CN102820927A (en) * | 2012-08-23 | 2012-12-12 | 安徽省科普产品工程研究中心有限责任公司 | Analog optical-fiber channel device and analog optical-fiber channel method |
| CN103036619A (en) * | 2012-12-21 | 2013-04-10 | 中国电力科学研究院 | Single-core optical transceiver and single-core optical transmission intelligent communication module and application thereof |
| CN103036619B (en) * | 2012-12-21 | 2018-01-16 | 中国电力科学研究院 | Single optical transport intelligent communication module and its application process |
| CN105761592A (en) * | 2016-04-15 | 2016-07-13 | 中国科学院上海技术物理研究所 | Visible light communication demonstration teaching aid |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |