CN104898305A - Variable-coefficient microwave photonic filter based on wavelength interval tunable laser - Google Patents
Variable-coefficient microwave photonic filter based on wavelength interval tunable laser Download PDFInfo
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- CN104898305A CN104898305A CN201510358789.2A CN201510358789A CN104898305A CN 104898305 A CN104898305 A CN 104898305A CN 201510358789 A CN201510358789 A CN 201510358789A CN 104898305 A CN104898305 A CN 104898305A
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/011—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour in optical waveguides, not otherwise provided for in this subclass
- G02F1/0115—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour in optical waveguides, not otherwise provided for in this subclass in optical fibres
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/05—Construction or shape of optical resonators; Accommodation of active medium therein; Shape of active medium
- H01S3/06—Construction or shape of active medium
- H01S3/063—Waveguide lasers, i.e. whereby the dimensions of the waveguide are of the order of the light wavelength
- H01S3/067—Fibre lasers
- H01S3/06708—Constructional details of the fibre, e.g. compositions, cross-section, shape or tapering
- H01S3/06729—Peculiar transverse fibre profile
- H01S3/06741—Photonic crystal fibre, i.e. the fibre having a photonic bandgap
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/10—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating
-
- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F2203/00—Function characteristic
- G02F2203/50—Phase-only modulation
Abstract
The invention discloses a variable-coefficient microwave photonic filter based on a wavelength interval tunable laser. The variable-coefficient microwave photonic filter based on the wavelength interval tunable laser is mainly composed of the wavelength interval tunable multi-wavelength laser and a Mach-Zehnder interferometer. According to the multi-wavelength laser, a Sagnac ring composed of pohotonic crystal fiber has a frequency selected filter effect, through changing the surrounding temperature of the pohotonic crystal fiber filled with glycerol and tuning the frequency selection characteristics of the Sagnac ring, the multi-wavelength laser outputs laser with different wavelength intervals so as to change the free spectrum range of the filter. Through regulating a variable optical delay line in the Mach-Zehnder interferometer and changing the arm length difference of the Mach-Zehnder interferometer, the transmission characteristics are changed, and carrier signals obtain different tap coefficients to obtain the variable-coefficient microwave photonic filter. The tunable and reconfigurable characteristics of the microwave photonic filter can be simultaneously realized through easily regulating the surrounding temperature of the pohotonic crystal fiber and the variable optical delay line.
Description
Technical field
The invention belongs to microwave photon filter technical field, particularly the variable microwave photon filter of a kind of coefficient based on wavelength interval tunable laser, this wave filter has tunable characteristic and restructural characteristic.
Background technology
Microwave photon filter can not only realize digital and electronic microwave filter to be made useful microwave signal pass through smoothly and suppresses the function of useless noise signal, and can realize the process of direct radio frequency signal in area of light.Microwave photon filter has high bandwidth, low-loss, electromagnetism interference, lightweight and support the features such as high sample frequency in radio system, is therefore widely used in every field.The research work of current various countries mainly concentrates on design novel microwave photon filter construction to realize negative and multiple tap coefficient, the frequency response that Q value is higher, tunable characteristic, restructural characteristic and larger dynamic range etc.But it is more difficult for designing the microwave photon filter realizing the multifrequency natures such as tunable characteristic, restructural characteristic, high Q factor simultaneously, many key technical problems wait to solve.
Multiple-wavelength laser is used as the light source of microwave photon filter, and structure is simple, reduces the complexity of wave filter.Laser wavelength interval is adjustable, the free spectral range of microwave photon filter is changed, realizes its tunable characteristic.Carrier signal after modulation is processed, changes the tap coefficient of carrier wave, the restructural characteristic of wave filter can be realized.Therefore can realize tunable characteristic and the restructural characteristic of microwave photon filter simultaneously.
Summary of the invention
The object of the invention is to solve the problem that existing microwave photon filter can not realize tunable characteristic and restructural characteristic simultaneously.Light source adopts the tunable multiple-wavelength laser in wavelength interval, by changing the temperature around the photonic crystal fiber being filled with glycerine, multiple-wavelength laser creates the multiwavelength laser of different interval, makes microwave photon filter have different free spectral ranges, realizes tunable characteristic.MZ interferometer processes the carrier signal after modulation, by regulating its arm length difference, making carrier signal obtain different tap coefficients, obtaining the microwave photon filter that tap coefficient is variable, realize its restructural characteristic.
Technical scheme of the present invention:
The variable microwave photon filter of coefficient based on wavelength interval tunable laser, comprises the tunable multiple-wavelength laser in wavelength interval, phase-modulator, Mach increasing Dare interferometer, single-mode fiber B, photodetector, vector network analyzer;
Wherein, the radiofrequency signal that the multi wave length illuminating source that multiple-wavelength laser exports is exported by phase-modulator and vector network analyzer is modulated, then increase Dare interferometer through Mach and carry out light process, after single-mode fiber B transmits, arrive photodetector and carry out opto-electronic conversion, the electric signal that photodetector exports enters vector network analyzer analysis.
Multiple-wavelength laser comprises pump light source, and by a wavelength division multiplexer pumping one section of Er-doped fiber; Comprise the optoisolator of the one-way transmission for ensureing light; Comprise the controller A that shakes for regulating polarisation of light state inclined; Comprise the single-mode fiber A for frequency stabilization; Comprise the coupling mechanism A of the laser for exporting generation; Also comprise as comb filter to produce the Sagnac ring of multiwavelength laser.Wherein, pump light source is 980nm pump light source, and wavelength division multiplexer is the wavelength division multiplexer of 980nm/1550nm.Sagnac ring by two output terminal power ratios be coupling mechanism B, the Polarization Controller B of 50:50, photonic crystal fiber forms.
Liquid filling has been carried out to the photonic crystal fiber in Sagnac ring, this liquid is glycerine, during filling, in selective light photonic crystal fiber, a larger airport carries out liquid filling, remaining air hole is not filled, and by the temperature variation around photonic crystal fiber, the tunable multiwavelength laser in final generation wavelength interval.Range of temperature around photonic crystal fiber is 25 DEG C ~ 120 DEG C.
The power ratio of coupling mechanism A two output terminals is 10:90, and the port that the laser that multiple-wavelength laser (12) produces accounts for 10% by coupling mechanism A output power exports.
Mach increase Dare interferometer by output terminal power ratio be 50:50 coupling mechanism C, light vairable delay line, input end power ratio be that 50:50 coupling mechanism D is formed.
In invention, the length of Er-doped fiber is 7m, and doping content is 400ppm; The length of photonic crystal fiber is 10m; The length of single-mode fiber A is 15km; The length of single-mode fiber B is 8km.
Advantage of the present invention and excellent beneficial effect:
This microwave photon filter adopts multiple-wavelength laser as light source, and structure is simple, easy to operate.By filling glycerine in laser instrument in photonic crystal fiber airport, change photonic crystal fiber environment temperature, laser instrument can produce the multi-wavelength at different wave length interval, makes wave filter obtain different free spectral ranges, realizes tunable characteristic.By regulating the arm length difference of MZ interferometer, making the carrier signal after modulation obtain different tap coefficients, realizing the restructural characteristic of wave filter.Therefore, by regulating the arm length difference of the temperature around photonic crystal fiber and MZ interferometer just can realize the tunable of microwave photon filter and restructural characteristic simultaneously.Flexible operation, structure is simple, and cost is lower, has higher using value.
Accompanying drawing explanation
Fig. 1 is this microwave photon filter construction figure
In figure: 1. pump light source, 2. wavelength division multiplexer, 3. Er-doped fiber, 4. optoisolator, 5. Polarization Controller A, 6. single-mode fiber A, 7. output terminal power ratio is 10:90 coupling mechanism A, 8.Sagnac ring, 9. output terminal power ratio is 50:50 coupling mechanism B, 10. Polarization Controller B, 11. photonic crystal fibers, 12. multiple-wavelength lasers, 13. phase-modulators, 14. output terminal power ratios are 50:50 coupling mechanism C, 15. smooth vairable delay lines, 16. input end power ratios are 50:50 coupling mechanism D, 17. Mach increase Dare interferometer, 18. single-mode fiber B, 19. photodetectors, 20. vector network analyzers.
Embodiment:
Below in conjunction with accompanying drawing, the present invention is described in further detail:
See accompanying drawing 1, the present invention is made up of the tunable multiple-wavelength laser 12 in wavelength interval, phase-modulator 13, Mach increasing Dare interferometer (MZ interferometer) 17, single-mode fiber 18, photodetector 19, vector network analyzer 20.After the multi wave length illuminating source that multiple-wavelength laser 12 produces exports from output terminal, the radiofrequency signal exported by phase-modulator 13 and vector network analyzer 20 is modulated, then increase Dare interferometer 17 through Mach and carry out light process, after being transmitted by single-mode fiber 18, arrive photodetector 19 and carry out opto-electronic conversion, the electric signal that photodetector 19 exports enters vector network analyzer 20 and analyzes.
In tunable multiple-wavelength laser 12 structure of wavelength interval, 980nm pump light source 1 is by wavelength division multiplexer 2 pumping one section of Er-doped fiber 3 of a 980nm/1550nm, optoisolator 4 ensures the one-way transmission of light, Polarization Controller A5 regulates polarisation of light state, single-mode fiber A6 has the effect of frequency stabilization, and two output terminal power ratios are that 10:90 coupling mechanism A7 exports the laser produced.By output terminal power ratio be coupling mechanism B9, the Polarization Controller B10 of 50:50, the Sagnac ring 8 that forms of photonic crystal fiber 11 as comb filter to produce multiwavelength laser, and wavelength interval is tunable.These devices form loop by Fiber connection, and the port that the laser of generation accounts for 10% by coupling mechanism A7 output power exports.
Be filled with glycerine in the airport that of photonic crystal fiber 11 is large, under room temperature, glycerine refractive index is 1.4665, and temperature coefficient is-0.000295 DEG C
-1.When making the temperature variation around photonic crystal fiber 11, the refractive index of glycerine can change, and then changes the birefringence of photonic crystal fiber 11.The filter characteristic of Sagnac ring 8 can change because of the birefringence change of photonic crystal fiber 11, finally makes the tunable multiwavelength laser in multiple-wavelength laser 12 output wavelength interval.Change the temperature being filled with the photonic crystal fiber 11 of glycerine, make its birefraction at Δ n
1to Δ n
2adjustable in scope, the wavelength interval that multiple-wavelength laser 12 produces multiwavelength laser is
wherein λ is the centre wavelength of input light, Δ n is the birefringence of photonic crystal fiber 11, l is the effective length of photonic crystal fiber 11, therefore when effective length l fixes, as long as make the birefringence of photonic crystal fiber 11 change, the wavelength interval Δ λ of output multiwavelength laser just can be made also to change thereupon.According to the characteristic of glycerine, the tuning range of temperature is 25 DEG C ~ 120 DEG C.
The free spectral range of microwave photon filter is
wherein T is the delay introduced by the dispersion of single-mode fiber A6, and it becomes reciprocal relation with free spectral range, and D is the abbe number of single-mode fiber A6, and L is the length of single-mode fiber A6, and Δ λ is the wavelength interval of input signal light.Visible, the change of input signal light wavelength interval delta λ can cause the change of FSR, so this scheme can realize the tuning of filter transmission band centre frequency.
When the optical maser wavelength interval that multiple-wavelength laser 12 produces is tunable, different wavelength intervals makes microwave photon filter have different free spectral ranges, realizes the tunable characteristic of microwave photon filter.
MZ interferometer 17 is exported by light vairable delay line 15 and two or power input is formed than the coupling mechanism being 50:50, is mainly used in processing the carrier signal through ovennodulation.The transmission spectrum shape of MZ interferometer 17 is similar to sine and cosine curve, and when carrier signal is positioned at curve positive slope position, coefficient is just, when being positioned at negative slope position, coefficient is multiple.Regulate light vairable delay line 15 that the arm length difference of MZ interferometer about 17 two-arm is changed, the transmission spectrum shape of MZ interferometer 17 changes.When multitap carrier signal is through MZ interferometer 17, tap coefficient will change, and forms the microwave photon filter that tap coefficient is variable, realizes the restructural characteristic of wave filter.
In microwave photon filter construction, the length of Er-doped fiber 3 is 7m, and doping content is 400ppm; The length of photonic crystal fiber 11 is 10m; The length of single-mode fiber A6 and single-mode fiber B18 is respectively 15km and 8km.
The microwave photon filter that the present invention proposes mainly comprises two-part structure, the tunable multiple-wavelength laser 12 in wavelength interval and MZ interferometer 17.The Sagnac ring 8 be made up of photonic crystal fiber 11 is as the frequency-selecting structure of multiple-wavelength laser, by changing the temperature around the photonic crystal fiber 11 being filled with glycerine, the selecting frequency characteristic of tuning Sagnac ring 8, multiple-wavelength laser 12 is made to export the laser at different wave length interval, thus change the free spectral range of wave filter, realize tunable characteristic.Regulate the light vairable delay line in MZ interferometer 17, change the arm length difference of MZ interferometer 17, its transmissison characteristic is changed, thus carrier signal obtains different tap coefficients, obtain the microwave photon filter that coefficient is variable, realize restructural characteristic.Just can realize the tunable of microwave photon filter and restructural characteristic by simply regulating the temperature and light vairable delay line 15 around photonic crystal fiber 11 simultaneously.Structure of the present invention is simple, and flexible operation, cost is lower, is applicable to the fields such as communication, radar, commercial production.
Claims (9)
1. based on the variable microwave photon filter of coefficient of wavelength interval tunable laser, it is characterized in that: comprise the tunable multiple-wavelength laser in wavelength interval (12), phase-modulator (13), Mach increasing Dare interferometer (17), single-mode fiber B (18), photodetector (19), vector network analyzer (20);
Wherein, the radiofrequency signal that the multi wave length illuminating source that multiple-wavelength laser (12) exports is exported by phase-modulator (13) and vector network analyzer (20) is modulated, then increase Dare interferometer (17) through Mach and carry out light process, after single-mode fiber B (18) transmission, arrive photodetector (19) and carry out opto-electronic conversion, the electric signal that photodetector (19) exports enters vector network analyzer (20) and analyzes.
2. the microwave photon filter according to claims 1, it is characterized in that: described multiple-wavelength laser (12) comprising: pump light source (1), and by a wavelength division multiplexer (2) pumping one section of Er-doped fiber (3); Comprise the optoisolator (4) of the one-way transmission for ensureing light; Comprise the controller A (5) that shakes for regulating polarisation of light state inclined; Comprise the single-mode fiber A (6) for frequency stabilization; Comprise the coupling mechanism A (7) of the laser for exporting generation; Also comprise as comb filter to produce the Sagnac ring (8) of multiwavelength laser.
3. the microwave photon filter according to claims 2, is characterized in that: described Sagnac ring (8) by two output terminal power ratios be coupling mechanism B (9), the Polarization Controller B (10) of 50:50, photonic crystal fiber (11) forms.
4. the microwave photon filter according to claims 1, is characterized in that: described Mach increase Dare interferometer (17) by output terminal power ratio be 50:50 coupling mechanism C (14), light vairable delay line (15), input end power ratio be that 50:50 coupling mechanism D (16) is formed.
5. the microwave photon filter according to claims 2, is characterized in that: described pump light source (1) is 980nm pump light source, the wavelength division multiplexer that described wavelength division multiplexer (2) is 980nm/1550nm.
6. the microwave photon filter according to claims 2 or 3, it is characterized in that: liquid filling has been carried out to the photonic crystal fiber (11) in Sagnac ring (8), this liquid is glycerine, during filling, in selective light photonic crystal fiber (11), a larger airport carries out liquid filling, remaining air hole is not filled, and by photonic crystal fiber (11) temperature variation around, the tunable multiwavelength laser in final generation wavelength interval.
7. the microwave photon filter according to claims 6, is characterized in that: photonic crystal fiber (11) range of temperature is around 25 DEG C ~ 120 DEG C.
8. the microwave photon filter according to claims 7, it is characterized in that: the power ratio of coupling mechanism A (7) two output terminals is 10:90, the port that the laser that multiple-wavelength laser (12) produces accounts for 10% by coupling mechanism A (7) power exports.
9. the microwave photon filter according to claims 2, is characterized in that: the length of described Er-doped fiber (3) is 7m, and doping content is 400ppm; The length of photonic crystal fiber (11) is 10m; The length of single-mode fiber A (6) is 15km; The length of single-mode fiber B (18) is 8km.
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105204121A (en) * | 2015-10-23 | 2015-12-30 | 哈尔滨工业大学 | Tunable optical filter based on dual-ring interferometer |
| CN106200015A (en) * | 2016-08-01 | 2016-12-07 | 天津理工大学 | Microwave photon filter based on high double-refraction photon crystal fiber multiple-wavelength laser Yu dispersion cascode device |
| CN106200014A (en) * | 2016-08-01 | 2016-12-07 | 天津理工大学 | Super wideband and tunable microwave photon filter based on high double-refraction photon crystal fiber Yu fiber optic loop |
| CN106226923A (en) * | 2016-08-01 | 2016-12-14 | 天津理工大学 | Smooth microwave photon filter based on MZ interferometer with the cascade of erbium-doped nonlinear fiber grating ring |
| CN106547119A (en) * | 2016-11-07 | 2017-03-29 | 北京大学 | A kind of tunable multi-wavelength light source microwave photon filter and filtering method |
| CN107910736A (en) * | 2017-12-19 | 2018-04-13 | 成都师范学院 | Increase the chirped laser pulse frequency spectrum shaping system of Dare interferometer based on Mach |
| CN109031702A (en) * | 2018-07-13 | 2018-12-18 | 安徽大学 | A kind of complex coefficient microwave photon filter based on Wavelength tunable laser |
| CN110783804A (en) * | 2019-07-19 | 2020-02-11 | 杭州电子科技大学 | Tunable multi-wavelength fiber laser based on polarization hole burning effect and Sagnac ring |
| CN112834070A (en) * | 2020-12-30 | 2021-05-25 | 上海第二工业大学 | Method for measuring temperature of optical fiber end face contact gas by using microwave photon filter |
| CN113703200A (en) * | 2021-08-18 | 2021-11-26 | 天津理工大学 | Tunable microwave photonic filter based on few-mode photonic crystal fiber mode multiplexing |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105204121A (en) * | 2015-10-23 | 2015-12-30 | 哈尔滨工业大学 | Tunable optical filter based on dual-ring interferometer |
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| CN106226923A (en) * | 2016-08-01 | 2016-12-14 | 天津理工大学 | Smooth microwave photon filter based on MZ interferometer with the cascade of erbium-doped nonlinear fiber grating ring |
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| CN106200015A (en) * | 2016-08-01 | 2016-12-07 | 天津理工大学 | Microwave photon filter based on high double-refraction photon crystal fiber multiple-wavelength laser Yu dispersion cascode device |
| CN106547119A (en) * | 2016-11-07 | 2017-03-29 | 北京大学 | A kind of tunable multi-wavelength light source microwave photon filter and filtering method |
| CN106547119B (en) * | 2016-11-07 | 2019-05-21 | 北京大学 | A kind of tunable multi-wavelength light source microwave photon filter and filtering method |
| CN107910736A (en) * | 2017-12-19 | 2018-04-13 | 成都师范学院 | Increase the chirped laser pulse frequency spectrum shaping system of Dare interferometer based on Mach |
| CN109031702A (en) * | 2018-07-13 | 2018-12-18 | 安徽大学 | A kind of complex coefficient microwave photon filter based on Wavelength tunable laser |
| CN110783804A (en) * | 2019-07-19 | 2020-02-11 | 杭州电子科技大学 | Tunable multi-wavelength fiber laser based on polarization hole burning effect and Sagnac ring |
| CN112834070A (en) * | 2020-12-30 | 2021-05-25 | 上海第二工业大学 | Method for measuring temperature of optical fiber end face contact gas by using microwave photon filter |
| CN112834070B (en) * | 2020-12-30 | 2023-09-22 | 上海第二工业大学 | Method for measuring contact gas temperature of optical fiber end face by utilizing microwave photon filter |
| CN113703200A (en) * | 2021-08-18 | 2021-11-26 | 天津理工大学 | Tunable microwave photonic filter based on few-mode photonic crystal fiber mode multiplexing |
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