CN102545004A - Anomalous dispersion light filter of 1.5-micron wave band and method for filtering signals - Google Patents
Anomalous dispersion light filter of 1.5-micron wave band and method for filtering signals Download PDFInfo
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- CN102545004A CN102545004A CN2012100420348A CN201210042034A CN102545004A CN 102545004 A CN102545004 A CN 102545004A CN 2012100420348 A CN2012100420348 A CN 2012100420348A CN 201210042034 A CN201210042034 A CN 201210042034A CN 102545004 A CN102545004 A CN 102545004A
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- rubidium lamp
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- magnetostatic field
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Abstract
The invention discloses an anomalous dispersion light filter of a 1.5-micron wave band and a method for filtering signals, belonging to the technical field of optoelectronics. The method comprises the following steps of: 1) sequentially placing a first polarizer, a rubidium lamp and a second polarizer in a light-filtering light path; 2) heating the rubidium lamp to a pre-set temperature range by a heating device and carrying out temperature control; 3) providing a radio frequency power needed by the rubidium lamp and deflecting a polarization plane of a target signal light by the rubidium lamp; 4) adjusting the polarization direction of the first polarizer or the second polarizer and filtering input signal lights to obtain the target signal light. The light filter comprises the first polarizer, the rubidium lamp and the second polarizer, wherein the rubidium lamp is placed in a magnetostatic field and the light can be transmitted from two ends of the rubidium lamp, which are close to the first polarizer and the second polarizer; a radio frequency coupling coil is wound outside the rubidium lamp and the heating device is arranged. According to the invention, the volume and the cost of a system of an excitation state atom light filter are reduced and the effect of simultaneously filtering different wavelengths can be realized.
Description
Technical field
The invention belongs to the photoelectron technology field, relate to atomic light filter that a kind of anomalous dispersion phenomenon of utilizing atom in magnetic field, to produce filters and the method for using 1.5 microns flashlights of this filter filter light communication band.
Technical background
1.5 micron waveband is one of important wave band of optical communication.Light signal receives the interference of stray lights such as daylight starlight easily, and the effect of filter is exactly the stray light of other frequencies beyond the shielded signal light frequency, and is therefore essential.Utilize the filter of atom effect of dispersion to compare the filter that utilizes the Atomic Absorption effect, it is fast to have response speed, the characteristics that transmitance is big; Compare traditional interferometric filter and the birefringece crystal filter has narrower bandwidth; Better sideband rejection ratio, bigger field of view angle, bigger transmitance; And operating frequency is tunable within the specific limits, at optical communication field very big advantages for development is arranged.For the 1.5um wave band, the rubidium atom is one well to be selected, its energy level 5P3/2-4D5/2, and the jump frequency between the 5P3/2-4D3/2 is respectively 1529.37nm, 1529.26nm (vacuum wavelength) can be used for carrying out filtering for the communicate optical signal of 1529nm.These transition of rubidium atom belong to the transition between the excited level, so corresponding Anomalous Dispersion Optical Filter should be the excitation state Anomalous Dispersion Optical Filter.
Up to the present, in all in the world excited atom filter (ESFADOF) systems, the pumping laser part that all is absolutely necessary.It is used for atom from the ground state pumping to excitation state.Specifically by the ESFADOF of rubidium atom 1529nm, need laser with a branch of 780nm with atom from ground state 5S1/2 pumping to first excited state 5P3/2, just can the flashlight of 1529nm be filtered then.And the stability of laser frequency is also very big to the influential effect of pumping, so a common cover frequency stabilization system is indispensable.Pumped laser system and frequency stabilization system thereof have all increased the cost and the volume of filter system greatly.
Summary of the invention
To the problem that exists in the prior art; The objective of the invention is to reduce traditional rubidium atom 1529nm ESFADOF structure and cost; A kind of novel structure of the light filter is proposed; Adopt electrodless discharge rubidium atomic lamp, utilize the radio-frequency power of rubidium lamp that 5P3/2 excitation state is arrived in the atomic excitation in the rubidium lamp, realized saving the purpose of 780nm pumped laser system expensive in the conventional system architecture.Greatly reduce cost, volume and the complexity of filter.
To achieve these goals, technical scheme of the present invention is:
A kind of method of Anomalous Dispersion Optical Filter trap signal of 1.5 micron wavebands the steps include:
1) in the optical filtering light path, places one first polarizer, a rubidium lamp, one second polarizer successively; Wherein, said rubidium lamp places in the magnetostatic field, and near the two ends light-permeable of said first and second polarizer;
2) through a heater said rubidium lamp is heated in the design temperature scope trip temperature of going forward side by side control;
3) for said rubidium lamp required radio-frequency power is provided, makes the rubidium lamp carry out deflection echo signal light polarization face;
4) filter the flashlight of importing the polarization direction of said first polarizer of adjustment or second polarizer, obtains this echo signal light.
Further, said magnetostatic field is an even magnetostatic field; Said magnetostatic field direction is parallel or vertical with the optical filtering direction of rubidium lamp.
Further, said magnetostatic field, rubidium lamp are positioned at a magnetic screen box.
Further, through one first magnet and one second magnet said magnetostatic field is provided, wherein said first magnet is relative with the second magnet polarity, and is parallel or place perpendicular to the optical filtering direction of said rubidium lamp.
Further, be that said rubidium lamp provides required radio-frequency power through a RF coupling loop; Wherein, said rubidium lamp is positioned at said RF coupling loop, and said heater and said RF coupling loop are positioned at said shielding box.
Further, adding galvanic RF coupling loop through one provides said magnetostatic field, and wherein said rubidium lamp is positioned in the said RF coupling loop; Said magnetostatic field is an even magnetostatic field, and said magnetostatic field and said rubidium lamp are positioned at a magnetic screen box.
Further, through on said RF coupling loop, adding an alternating current, said radio-frequency power is provided; Said heater and said RF coupling loop are positioned at said shielding box.
Further, excite the color of the light that said rubidium lamp produces, confirm the radio-frequency power that this echo signal light is required according to radio-frequency power.
Further, said flashlight with set angle from said first polarizer plane of incidence incident; Wherein, the angle of the said flashlight and the plane of incidence is less than 45 °.
Further, be provided with an interferometric filter before said second polarizer, be used for filtering environmental light.
Further, confirm the magnetic field size and Orientation of said magnetostatic field, make the filter effect of said rubidium lamp reach maximum according to rubidium atom in the said rubidium lamp and work energy state thereof.
A kind of Anomalous Dispersion Optical Filter of 1.5 micron wavebands is characterized in that comprising one first polarizer, a rubidium lamp, one second polarizer placed successively in the optical filtering light path; Wherein, said rubidium lamp places in the magnetostatic field, and near the two ends light-permeable of said first and second polarizer; Said rubidium lamp is around with a RF coupling loop, and is provided with a heater.
Further, said magnetostatic field is an even magnetostatic field; Said magnetostatic field direction is parallel or vertical with the optical filtering direction of rubidium lamp.
Further, said magnetostatic field, rubidium lamp, heater and said RF-coupled line are positioned at a magnetic screen box.
Further, through one first magnet and one second magnet said magnetostatic field is provided, wherein first magnet is relative with the second magnet polarity, and is parallel or place perpendicular to the optical filtering direction of said rubidium lamp.
Further, add an alternating current and a direct current on the said RF coupling loop respectively, wherein pass through add direct current said magnetostatic field be provided, pass through add alternating current required radio-frequency power be provided.
Further, said magnetostatic field is an even magnetostatic field; Said rubidium lamp is positioned in the said RF coupling loop; Said heater, RF coupling loop and said rubidium lamp are positioned at a magnetic screen box.
Further, be provided with an interferometric filter before said second polarizer, be used for filtering environmental light.
The novel structure of the light filter narration of 1529nm provided by the invention as follows.
Said rubidium lamp is a glass envelope, is filled with nature rubidium atom and buffer gas in the glass envelope, and glass envelope is around with RF coupling loop; Heating element is fixed on the rubidium lamp, is used to heat the rubidium lamp, the even magnetostatic field that the rubidium lamp places two magnet or energising helical coil to form; Two polarizers are placed on the two ends of rubidium lamp; The rubidium lamp also comprises a filter near the two ends light-permeable of polarizer spare, between second polarizer spare and rubidium lamp.
The present invention also provides a kind of method of said filter trap signal light, comprises the steps:
1) according to the size and Orientation of magnetostatic field in the rubidium atom in the rubidium lamp adjustment filter;
2) heating element is heated to design temperature with the rubidium lamp;
3) RF coupling loop of rubidium lamp is the radio-frequency power of 50MHz to 300MHz for the rubidium lamp provides frequency, makes the rubidium lamp luminous, and the work atom in the rubidium lamp is in excitation state;
4) size of the alternating current adjustment radio-frequency power through regulating RF coupling loop makes whole rubidium lamp body glow color be the most bright-coloured aubergine, and can assemble maximum atom on the 5P3/2 attitude this moment;
5) the flashlight incident angle that need to filter is for being the center with the filter axial direction, and in 45 ° of the deflections, flashlight sees through second polarizer spare, the flashlight after obtaining to filter after passing the rotation of rubidium lamp generation plane of polarization after the inclined to one side device incident of the first.
Compared with prior art, good effect of the present invention is:
1) than the excited atom filter of existing techniques in realizing, the frequency stabilization pumping laser has greatly reduced the system bulk and the cost of excited atom filter with ground state atom pumping band excitation state owing to utilized electrodeless lamp not need to overlap independently in the present invention.
2) the present invention is owing to utilized electrodeless lamp; The ground state of atom and a lot of excitation state all have the population layout, thus same set of atomic light filter can realize several when excitation state begins and begin to the different wave length other yuan attitude from excitation state filter effect.
Description of drawings
Fig. 1 is the rubidium atom 1529nm excitation state anomalous dispersion atomic light filter structural representation of embodiment 1;
Fig. 2 is the rubidium atom 1529nm excitation state anomalous dispersion atomic light filter structural representation of embodiment 2;
The inclined to one side device of 1-the first; 2-first permanent magnet; 3-magnetic screen shell; The 4-RF coupling loop; 5-rubidium lamp; 6-second permanent magnet; The 7-interferometric filter; 8-second polarizer spare; The 9-heating element; The 10-circuit box; The 11-electric wire;
Fig. 3 is two kinds of isotope 85Rb and the 87Rb ground state 5S and the excitation state 4P3/2 of rubidium atom, the energy diagram of 4D5/2;
Fig. 4 is the relation of filter effect with the 1529nm rubidium atom faraday anomalous dispersion atomic light filter of embodiment 1 radio-frequency power during with different voltage, and following curve is the 1529nm absorption spectra reference curve that the rubidium atom pair is answered.
Embodiment
For making the object of the invention, technical scheme and advantage clearer, will combine the accompanying drawing in the embodiment of the invention below, the technical scheme in the embodiment of the invention is carried out clear, intactly description.Based on the embodiment among the present invention, those of ordinary skills are not making the every other embodiment that is obtained under the creative work prerequisite, all belong to the scope of the present invention's protection.
A kind of enforcement structure chart of the present invention is as shown in Figure 1, and permanent magnet 2 and 6 is an annular, middle ability printing opacity, and first permanent magnet 2 and second permanent magnet, 6 polarity are placed relatively, are axially forming a parallel magnetic field.Two permanent magnets also can not adopt the modes of emplacement of Fig. 1, and are positioned over the upper and lower of rubidium lamp 5, and polarity is relative, thereby form and axial vertical magnetic field.The different size and Orientations in magnetic field can obtain through the position of adjusting first permanent magnet 2 and second permanent magnet 6.
Between first permanent magnet 2 and second permanent magnet 6 is rubidium lamp 5, and rubidium lamp 5 is a cylindrical glass bubble, is filled with rubidium atom and buffer gas in the glass envelope, and buffer gas is inert gas basically, like argon, and krypton, xenon; Rubidium lamp 5 is around with RF coupling loop 4, and circuit box 10 electrically connects as RF coupling loop 4 power supplies through electric wire 11 and RF coupling loop 4.Being fixed with heating element 9 on the rubidium lamp 5, can be heating plate, also is fixed with the temperature regulating device (not shown) heating-up temperature is controlled, and heating element 9 is electrically connected with circuit box 10 through electric wire 11 with temperature regulating device, and circuit box 10 is its power supply.
Said structure all places in the magnetic screen shell 3; One sleeve (not shown) is respectively arranged on magnetic cup shell 3 two sides; Inclined to one side together device is respectively arranged in the sleeve; Be the inclined to one side device 1 of the first and second polarizer spare 8, the folk prescription that rises of the inclined to one side device 1 of the first and second polarizer spare 8 makes the extinction ratio of non-resonant light reach optimum state to need.Also be placed with an interferometric filter 7 in the place ahead of second polarizer spare 8, let flashlight pass through, farthest stop light output.The inclined to one side device 1 of the first and second polarizer spare 8 are Glan prism.
The filter of embodiment 1 leaches the method for 1529nm flashlight:
1) according to the rubidium atom in the rubidium lamp 5 with and the work energy state confirm best magnetic field size; The position of adjustment filter first permanent magnet 2 and second permanent magnet 6; The size of regulating magnetostatic field makes filter effect reach maximum; When the direction of magnetostatic field is parallel with the light vector direction, being faraday (Faraday) filter, is Fo Getuo (Voigt) filter when the direction of magnetostatic field is vertical with the light vector direction;
2) circuit box 10 makes rubidium lamp 5 be heated to design temperature for heating element 9 power supplies, and temperature regulating device is controlled temperature;
3) circuit box 10 is RF coupling loop 4 power supply, and for rubidium lamp 5 provides the radio-frequency power of 60MHz to 200MHz, rubidium lamp 5 is lighted, and the rubidium atom is in excitation state;
4) regulate radio-frequency power, make rubidium lamp 5 glow colors be the most bright-coloured aubergine;
4) flashlight that need to filter passes rubidium lamp 5 after inclined to one side device 1 incident of the first and takes place to filter light through interferometric filter 7 after the rotation of plane of polarizations, sees through second polarizer spare 8, and acquisition needs the flashlight of frequency.Laser can also can have the incidence angle of certain relative this direction along the optical propagation direction incident shown in the figure one of filter, in about 45 °.
Other a kind of enforcement structure of the present invention is shown in accompanying drawing 2.Its structure and embodiment 1 are approaching, but than embodiment 1, are to utilize the energising helical coil to produce magnetostatic field, replace magnet.Its structure description is following.
The workflow of embodiment 2 and embodiment 1 are similar, are summarized as follows.
According to the rubidium atom with and the work energy state confirm best magnetic field size and Orientation, the direct current of design RF coupling loop 4 is adjusted the size of magnetostatic field.
Under the state that rubidium lamp 5 extinguishes adjusting Glan prism 1 and 8 play folk prescription to reaching best extinction ratio.The alternating current of regulating winding 4, the size of the radio-frequency power that adjustment is supplied with luminously is the most bright-coloured aubergine with what regulate rubidium lamp 5.Flashlight incident direction and embodiment 1 are similar.
Advantage of the present invention is, makes the volume of 1529nm rubidium atom ESFADOF significantly reduce, and less than 0.2 liter, its structure and common ground state FADOF are similar, save pumping laser, significantly reduce the cost of system.
What should explain at last is: above embodiment is only in order to technical scheme of the present invention to be described but not limit it; Although the present invention has been carried out detailed explanation with reference to preferred embodiment; Those of ordinary skill in the art is to be understood that: it still can make amendment or be equal to replacement technical scheme of the present invention, also can not make amended technical scheme break away from the spirit and the scope of technical scheme of the present invention and these are revised or be equal to replacement.
Claims (18)
1. the method for the Anomalous Dispersion Optical Filter trap signal of a micron waveband the steps include:
1) in the optical filtering light path, places one first polarizer, a rubidium lamp, one second polarizer successively; Wherein, said rubidium lamp places in the magnetostatic field, and near the two ends light-permeable of said first and second polarizer;
2) through a heater said rubidium lamp is heated in the design temperature scope trip temperature of going forward side by side control;
3) for said rubidium lamp required radio-frequency power is provided, makes the rubidium lamp carry out deflection echo signal light polarization face;
4) filter the flashlight of importing the polarization direction of said first polarizer of adjustment or second polarizer, obtains this echo signal light.
2. the method for claim 1 is characterized in that said magnetostatic field is an even magnetostatic field; Said magnetostatic field direction is parallel or vertical with the optical filtering direction of rubidium lamp.
3. according to claim 1 or claim 2 method is characterized in that said magnetostatic field, rubidium lamp are positioned at a magnetic screen box.
4. method as claimed in claim 3 is characterized in that through one first magnet and one second magnet said magnetostatic field being provided, and wherein said first magnet is relative with the second magnet polarity, and is parallel or place perpendicular to the optical filtering direction of said rubidium lamp.
5. method as claimed in claim 3 is characterized in that through a RF coupling loop being that said rubidium lamp provides required radio-frequency power; Wherein, said rubidium lamp is positioned at said RF coupling loop, and said heater and said RF coupling loop are positioned at said shielding box.
6. the method for claim 1 is characterized in that adding galvanic RF coupling loop through one provides said magnetostatic field, and wherein said rubidium lamp is positioned in the said RF coupling loop; Said magnetostatic field is an even magnetostatic field, and said magnetostatic field and said rubidium lamp are positioned at a magnetic screen box.
7. method as claimed in claim 6 is characterized in that through on said RF coupling loop, adding an alternating current said radio-frequency power being provided; Said heater and said RF coupling loop are positioned at said shielding box.
8. the method for claim 1 is characterized in that exciting according to radio-frequency power the color of the light that said rubidium lamp produces, and confirms the radio-frequency power that this echo signal light is required.
9. the method for claim 1, it is characterized in that said flashlight with set angle from said first polarizer plane of incidence incident; Wherein, the angle of the said flashlight and the plane of incidence is less than 45 °.
10. method as claimed in claim 9 is characterized in that being provided with an interferometric filter before said second polarizer, is used for filtering environmental light.
11. the method for claim 1 is characterized in that confirming the magnetic field size and Orientation of said magnetostatic field according to rubidium atom in the said rubidium lamp and work energy state thereof, makes the filter effect of said rubidium lamp reach maximum.
12. the Anomalous Dispersion Optical Filter of a micron waveband is characterized in that comprising one first polarizer, a rubidium lamp, one second polarizer placed successively in the optical filtering light path; Wherein, said rubidium lamp places in the magnetostatic field, and near the two ends light-permeable of said first and second polarizer; Said rubidium lamp is around with a RF coupling loop, and is provided with a heater.
13. filter as claimed in claim 12 is characterized in that said magnetostatic field is an even magnetostatic field; Said magnetostatic field direction is parallel or vertical with the optical filtering direction of rubidium lamp.
14. filter as claimed in claim 13 is characterized in that said magnetostatic field, rubidium lamp, heater and said RF-coupled line are positioned at a magnetic screen box.
15. like claim 12 or 13 or 14 described filters, it is characterized in that through one first magnet and one second magnet said magnetostatic field being provided, wherein first magnet is relative with the second magnet polarity, and is parallel or place perpendicular to the optical filtering direction of said rubidium lamp.
16. filter as claimed in claim 12 is characterized in that adding an alternating current and a direct current on the said RF coupling loop respectively, wherein pass through add direct current said magnetostatic field be provided, pass through add alternating current required radio-frequency power be provided.
17. filter as claimed in claim 16 is characterized in that said magnetostatic field is an even magnetostatic field; Said rubidium lamp is positioned in the said RF coupling loop; Said heater, RF coupling loop and said rubidium lamp are positioned at a magnetic screen box.
18. filter as claimed in claim 12 is characterized in that being provided with an interferometric filter before said second polarizer, is used for filtering environmental light.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2012100420348A CN102545004A (en) | 2012-02-22 | 2012-02-22 | Anomalous dispersion light filter of 1.5-micron wave band and method for filtering signals |
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| CN2012100420348A CN102545004A (en) | 2012-02-22 | 2012-02-22 | Anomalous dispersion light filter of 1.5-micron wave band and method for filtering signals |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104953460A (en) * | 2015-06-05 | 2015-09-30 | 北京大学 | Two-photon atomic optical filter and optical signal filtering method implemented by aid of same |
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2012
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| US5192978A (en) * | 1991-09-17 | 1993-03-09 | Kaman Aerospace Corporation | Apparatus and method for reducing solar noise in imaging lidar, underwater communications and lidar bathymetry systems |
| CN1301972A (en) * | 1999-12-30 | 2001-07-04 | 中国科学院武汉物理与数学研究所 | Active rubidium atom resonance light filter |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104953460A (en) * | 2015-06-05 | 2015-09-30 | 北京大学 | Two-photon atomic optical filter and optical signal filtering method implemented by aid of same |
| CN104953460B (en) * | 2015-06-05 | 2018-10-19 | 北京大学 | A kind of two-photon atomic light filter and its method for crossing optical filtering signals |
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