CN2569271Y - Crystal photoelectric modulator - Google Patents
Crystal photoelectric modulator Download PDFInfo
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- CN2569271Y CN2569271Y CN 02275336 CN02275336U CN2569271Y CN 2569271 Y CN2569271 Y CN 2569271Y CN 02275336 CN02275336 CN 02275336 CN 02275336 U CN02275336 U CN 02275336U CN 2569271 Y CN2569271 Y CN 2569271Y
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- electro
- crystal
- optic crystal
- amplifier
- modulator
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Abstract
The utility model relates to a crystal photoelectric modulator which belongs to teaching appliances for institutions of higher learning. The utility model uses a semiconductor laser (18) as a light source. The crystal photoelectric modulator is formed by that a power-supply modulating part (11) is composed of a DC power supply (5), a sine-wave oscillator (7), a musical film (6) and an amplifier (4), and a modulator part (12) is composed of three rotatable polarizing sheets (1) and a block of electro-optical crystal (2); the electro-optical crystal (2) is put between two orthometric polarizing sheets (1), and the third polarizing sheet (1) is put in front of a polarizer; a receiving amplifier part (13) is composed of a photoelectric triode (3), a power amplifier (10) and a speaker (8). The utility model has the advantages of low working voltage, high safety during operation, stable performance, less power consumption, energy saving, long service life, small volume, light weight, low price, press resistance, less possibility of being damaged, and convenient packaging and transportation.
Description
Technical field
The utility model belongs to institution of higher learning's instruments used for education.
Background technology
Belonging to the most close instruments used for education with the utility model is to be published in " Physical Experiment " magazine Vol.10, and No.5 (1990) is in " experiment of electric light Modulation and Amplitude Modulation " article of P193.This instrument is made up of modulation power source, modulator and three major parts of reception amplifier, as shown in Figure 1.Among Fig. 1,11 is the modulation power source part, and 12 is the modulator part, and 13 is receiver amplifier unit.
Modulation power source part 11 is by continuously adjustable direct supply 5, and the sinusoidal wave oscillator 7 of single-frequency (the concussion frequency is about 1KHZ), musical film 6 and amplifier 4 are formed.Three and half digital panel meters are arranged on the power panel, can show dc bias value.By sinusoidal wave oscillator 7 or musical film 6 in the machine or import any electric signal by the outside by " input " jack on the rear panel and make modulation signal.By the reference signal of the output of " output " jack on the front panel, receive the signal of exporting with reception amplifier 13 on the dual beam oscilloscope 9 and compare, observe the output characteristics of modulator.
This instrument is owing to use He-Ne laser to make light source, and operating voltage is higher than 1000V, and is dangerous, unstable, makes instrument physical dimension big; Laser tube is glassware, and is frangible, packing, transportation inconvenience; The price height of laser instrument, only 1～2 year serviceable life; Power consumption is big, at tens watts to more than tens watts.
Summary of the invention
The technical problems to be solved in the utility model is, on the basis of background technology, do not make too big change, makes crystal electrooptic modulator volume little in light weight, and work safety is stable, and the life-span lattice that raise the price are low, energy-conservation, and packed and transported is convenient.
The utility model is the same with background technology, and its structure is made up of modulation power source, modulator and three parts of reception amplifier.
That is, the same with background technology, the modulation power source part is made up of continuously adjustable direct supply, sinusoidal wave oscillator, musical film and amplifier.There is digital panel meter to show dc bias value on the power panel.Sinusoidal wave oscillator or musical film provide modulation signal, also can import any electric signal by the outside by " input " jack on the rear panel and make modulation signal.By the reference signal of the output of " output " jack on the front panel, receive on the dual beam oscilloscope and compare with output signal, observe the output characteristics of modulator.The modulator part is made up of rotatable polaroid and lithium niobate electro-optic crystal, adopts horizontal modulation system.The lithium niobate electro-optic crystal is placed between the polaroid of two quadratures, and polarizing plate is parallel with the X-axis of lithium niobate electro-optic crystal.The lithium niobate electro-optic crystal is fixed on the four-dimensional adjusting bracket, can meticulously regulate, and makes the light beam strictness pass through the lithium niobate electro-optic crystal along optical axis direction.Receiver amplifier unit is made up of phototriode and power amplifier.Phototriode through opto-electronic conversion, is input to modulated light signal on the power amplifier, and the signal after the amplification is received dual beam oscilloscope, with reference signal relatively, observes the output characteristics of modulator.Receiver amplifier unit also can be adorned loudspeaker, is used for reproducing the sound of modulation signal.
With background technology different be the He-Ne laser instrument that substitutes background technology with semiconductor laser.The xsect of semiconductor laser beam is rectangular, in order to obtain the light beam as He-Ne laser, circular hole light hurdle on semiconductor laser output light window is pre-installed.
Consider the difficulty that light path is regulated, semiconductor laser is fixed on the precise 2-D adjusting bracket.
The utility model is owing to the He-Ne laser instrument that substitutes background technology with semiconductor laser, so have following advantage: (1) operating voltage is 3.5 volts, safe in utilization, stable performance; And the He-Ne laser operating voltage is greater than 1000 volts.(2) energy-conservation, during output power 3mW, the about 0.5W of power consumption; And during He-Ne laser instrument (the long 230mm in chamber) output power 3mW, power consumption is greater than 20W.(3) life-span is long more than 10,000 hours the working time; And about 1～2 year of He-Ne laser life-span.(4) volume is little, in light weight, price is low.(5) semiconductor laser is a metal shell, and not to be stowed under heavy cargo is not perishable, and packed and transported is convenient; And the laser tube of He-Ne laser instrument is a glassware, and is frangible, the packed and transported inconvenience.
The utility model can be used for following Physical Experiment: the variation of the crystal optics character that (1) observation electrooptical effect causes; (2) measure direct current output characteristic curve, i.e. T-V curve; (3) mensuration of the half-wave voltage of crystal and electrooptical coefficient; (4) observation of modulator ac modulation output characteristics; (5) select the working point with quarter wave plate; (6) demonstration of laser communications.
Embodiment
In Fig. 2, by direct supply 5, sinusoidal wave oscillator 7, musical film 6 and amplifier 4 are formed modulation power source part 11.Any one provides modulation signal by sinusoidal wave oscillator 7 or musical film 6 in the machine or by the outside is imported in any electric signal by " input " jack on the rear panel.
Form receiver amplifier unit 13 by phototriode 3 and power amplifier 10.Loudspeaker 8 is housed in the reception amplifier 13.
Oscillograph 9 is used to observe the modulation signal that reference signal that amplifier 4 sends and power amplifier 10 send.
Annexation between each several part and each element is identical with background technology.
The installation of embodiment 2 aluminium electrodes.
The aluminium electrode of lithium niobate electro-optic crystal 2 tops is processed into the rectangular parallelepiped with the identical size of lithium niobate electro-optic crystal 2 upper surfaces, prevents compressing with spring leaf on lithium niobate electro-optic crystal 2, can make crystal moistureproof dustproof.
Among Fig. 2,16 is the aluminium electrode.Compress among the spring leaf of usefulness and the contact conductor figure and do not draw.
Description of drawings
Fig. 1 is the structured flowchart of background technology.
Fig. 2 is a structured flowchart of the present utility model.
Claims (3)
1, a kind of crystal current photomodulator comprises light source, modulation power source part (11), modulator part (12), receiver amplifier unit (13); Modulation power source part (11) is made up of direct supply (5), sinusoidal wave oscillator (7), musical film (6) and amplifier (4); Modulator part (12) is made up of three rotatable polaroids (1) and an electro-optic crystal (2), electro-optic crystal (2) is placed between the polaroid (1) of two quadratures, the polarizer is parallel with the X-axis of electro-optic crystal (2), analyzer and electro-optic crystal insert quarter wave plate between (2), before the 3rd polaroid (1) is placed on the polarizer; Receiver amplifier unit (13) is made up of phototriode (3) and power amplifier (10), loudspeaker (8); It is characterized in that said light source is semiconductor laser (18), before semiconductor laser (18) output light window, circular hole light hurdle (17) is housed.
According to the described crystal current photomodulator of claim 1, it is characterized in that 2, semiconductor laser (18) is fixed on the two-dimensional adjustment frame.
According to claim 1 or 2 described crystal current photomodulators, it is characterized in that 3, aluminium electrode (16) is and the rectangular parallelepiped of the identical size of lithium niobate electro-optic crystal (2) upper surface, be placed on above the lithium niobate electro-optic crystal (2), compress by spring leaf.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 02275336 CN2569271Y (en) | 2002-09-18 | 2002-09-18 | Crystal photoelectric modulator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 02275336 CN2569271Y (en) | 2002-09-18 | 2002-09-18 | Crystal photoelectric modulator |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2569271Y true CN2569271Y (en) | 2003-08-27 |
Family
ID=33739410
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 02275336 Expired - Fee Related CN2569271Y (en) | 2002-09-18 | 2002-09-18 | Crystal photoelectric modulator |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2569271Y (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102033334A (en) * | 2010-12-14 | 2011-04-27 | 江汉大学 | Electro-optic modulator based on gamma 51 and realization method |
| CN108847091A (en) * | 2018-04-24 | 2018-11-20 | 山东大学 | A kind of instrument and meter and automated integrated experimental device |
| CN110907136A (en) * | 2019-11-21 | 2020-03-24 | 山西大学 | Temperature-controllable electro-optic amplitude modulator and test method |
-
2002
- 2002-09-18 CN CN 02275336 patent/CN2569271Y/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102033334A (en) * | 2010-12-14 | 2011-04-27 | 江汉大学 | Electro-optic modulator based on gamma 51 and realization method |
| CN108847091A (en) * | 2018-04-24 | 2018-11-20 | 山东大学 | A kind of instrument and meter and automated integrated experimental device |
| CN108847091B (en) * | 2018-04-24 | 2020-08-28 | 山东大学 | Instrument and meter and automatic comprehensive experiment device |
| CN110907136A (en) * | 2019-11-21 | 2020-03-24 | 山西大学 | Temperature-controllable electro-optic amplitude modulator and test method |
| CN110907136B (en) * | 2019-11-21 | 2020-11-10 | 山西大学 | Temperature-controllable electro-optic amplitude modulator and test method |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| 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 |