CN103235374A - Microwave photon filter of multi-wavelength light source and tuning and reconfiguring method of microwave photon filter - Google Patents
Microwave photon filter of multi-wavelength light source and tuning and reconfiguring method of microwave photon filter Download PDFInfo
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- CN103235374A CN103235374A CN2013101294135A CN201310129413A CN103235374A CN 103235374 A CN103235374 A CN 103235374A CN 2013101294135 A CN2013101294135 A CN 2013101294135A CN 201310129413 A CN201310129413 A CN 201310129413A CN 103235374 A CN103235374 A CN 103235374A
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Abstract
The invention discloses a microwave photon filter of a multi-wavelength light source and a tuning and reconfiguring method of the microwave photon filter. The microwave photon filter of the multi-wavelength light source comprises a multi-wavelength light source generator and a microwave filter device. The microwave filter device comprises a phase modulator, an adjustable dispersion compensator, a first erbium-doped optical fiber amplifier, a photoelectric detector and a vector network analyzer. A comb-shaped optical fiber of the multi-wavelength light source generator is a programmable optical filter. By observing response curve of the network analyzer, dispersion value of the adjustable dispersion compensator is adjusted, time delay between adjacent optical wavelengths of adjacent multi-wavelength light is changed continuously, and central continuous tuning of the microwave photon filter can be realized. The number of comb-shaped pass bands is set by the programmable optical filter to change the number of emitting wavelengths, and adjustment of the bandwidth of the microwave photon filter is realized. Tunable capacity and reconfigurability of the microwave photon filter are realized, and the microwave photon filter can be more flexibly used for the microwave signal processing system.
Description
Technical field
The present invention relates to a kind of microwave photon filter and tuning, reconstructing method thereof of multi wave length illuminating source.
Background technology
Microwave photon filter is the important branch that microwave photon is learned, and it is to utilize optical means microwave signal to be carried out the optical system of filtering.Based on method of optics microwave signal is handled Inherent advantages such as can utilizing optical device is in light weight, volume is little, loss is little, bandwidth is big, anti-electromagnetic interference (EMI).In addition, based on the microwave filter of photon, also have tuning performance good, have the good characteristic that electronic microwave wave filter such as reconfigurability is not easy to realize, can overcome electronic bottleneck.In recent years, the fast development along with microwave photon filter is widely used in microwave filtering, fields such as photon mixing and transient microwave frequency measurement.From the light-source angle of microwave photon filter use, can be divided into single light source microwave photon filter and multiple light courcess microwave photon filter two classes.
Because the horizontal microwave photon filter of traditional multiple light courcess, tap coefficient all is positive, therefore has baseband response, and what obtain is a low-pass filter rather than bandpass filter.Propose to utilize the phase place of phase-modulator to the transformation of intensity (PM – IM) afterwards, can eliminate baseband response, formed the bandpass filter of equivalence.As everyone knows, depend on the number of tap based on the bandwidth of the microwave photon filter of multi-wavelength, Free Spectral Range (FSR) depends on wavelength interval and the dispersive medium between the tap.Yet be subject to factors such as number of taps, wavelength interval and dispersive medium, aspect tunability and the reconfigurability, have certain deficiency based on the microwave photon filter of multiple light courcess.
Summary of the invention
Technical matters to be solved by this invention provides a kind of tunable, reconfigurable microwave photon filter based on multi wave length illuminating source, can overcome the deficiency that traditional multiple light courcess microwave photon filter exists tuning performance and reconfigurability.
For solving the problems of the technologies described above, the invention provides a kind of microwave photon filter based on multi wave length illuminating source, comprise multi-wavelength light source generator and microwave filtering device, described microwave filtering device comprises phase-modulator, adjustable dispersion compensator, first Erbium-Doped Fiber Amplifier (EDFA), photodetector and vector network analyzer; After the multi-wavelength light of described multi-wavelength light source generator output successively amplifies through described phase-modulator modulation, adjustable dispersion compensator, first Erbium-Doped Fiber Amplifier (EDFA), enter described photodetector and enter described network analyzer after by opto-electronic conversion; Described adjustable dispersion compensator is used for changing continuously between the adjacent wavelength of multi-wavelength light because the time delay that chromatic dispersion is introduced.The phase place that described phase-modulator has to eliminate baseband response, makes described microwave filtering device form the bandpass filter of equivalence to the changing function of intensity.
Further optimized technical scheme is, described multi-wavelength light source generator comprises comb optical filter, and described comb optical filter is programmable optical filter, and described programmable optical filter is used for arranging neatly number and the whole envelope of pectination passband.
Described multi-wavelength light source generator also comprises second Erbium-Doped Fiber Amplifier (EDFA) and highly nonlinear optical fiber.The high-power second Erbium-Doped Fiber Amplifier (EDFA) EDFA is as gain media, and the nonlinear effect of highly nonlinear optical fiber suppresses the mode competition of EDFA, realizes the stable adjustable multi wave length illuminating source of wavelength number.
Know-why of the present invention is: the response curve function based on the microwave photon filter of multi wave length illuminating source, phase place modulation is as follows:
Wherein χ represents the dispersion values by the dispersion compensator introducing,
The centre wavelength of expression multi wave length illuminating source, Δ λ represents adjacent wavelength interval, f is the microwave frequency of modulation, P
nThe luminous power of representing n wavelength.The response function of total system can be divided into H
1(f), H
2(f) two parts, H
1(f) the expression phase place is modulated to the response function that intensity changes, and first peak value is positioned at
Have depression at the direct current place, this is owing to phase place modulation first order side band exists anti-phase characteristic to cause.H
2(f) the horizontal microwave photon filter response function of the typical many taps positive coefficient of expression has periodic response curve, FSR=1 Δ λ χ.Utilize the phase place phase modulation to the transformation of intensity, can eliminate baseband response, form the logical microwave photon filter of band of equivalence.
Tunability: the passband center that refers to microwave photon filter can be regulated.Band leads to the 1 Δ λ χ that is centered close to of microwave photon filter.The present invention utilizes the continuously adjustable dispersion compensator of dispersion values as dispersive medium, by changing the dispersion values of dispersion compensator, just can realize the continuously adjustable at passband center within the specific limits.
Reconfigurability: the passband shapes that refers to microwave photon filter can be regulated.According to theoretical analysis, the bandwidth of microwave photon filter depends primarily on number of taps, i.e. the number of multi wave length illuminating source medium wavelength.Number of taps is more many, and the bandwidth of microwave photon filter is just more narrow.In multi wave length illuminating source of the present invention, utilize programmable optical filter that the number of pectination passband is set, change the number of outgoing wavelength, realize the adjusting of microwave photon filter bandwidth.In addition, by the envelope of whole smooth pectination passband is set, be equivalent to windowing, can also change the main side valve suppression ratio (MSR) of microwave photon filter.
The present invention provides the tuning methods of above-mentioned microwave photon filter simultaneously, comprise: by observing the response curve on the network analyzer, adjust the dispersion values of adjustable dispersion compensator, then change the time delay of introducing owing to chromatic dispersion between the adjacent taps continuously, realize the center continuously adjustable of microwave photon filter.
The present invention also provides the reconstructing method of above-mentioned microwave photon filter simultaneously, comprising: by utilizing programmable optical filter the number of pectination passband is set, changes the number of outgoing wavelength, realize the adjusting of microwave photon filter bandwidth.
The present invention has proposed tunable dispersion compensator first as dispersive medium, adopted programmable optical filter in the multi-wavelength light source generator, realize the tunable and reconfigurability of microwave photon filter, can be used for the microwave signal disposal system more flexibly.
Description of drawings
Below in conjunction with the drawings and specific embodiments technical scheme of the present invention is further described in detail.
Fig. 1 is the structural representation of multi-wavelength light source generator of the present invention.
Fig. 2 is the structural representation of microwave photon filter of the present invention.
Among the figure, 1-the second Erbium-Doped Fiber Amplifier (EDFA) EDFA, 2-optoisolator, 3-highly nonlinear optical fiber HNLF, 4-Polarization Controller, 5-90:10 fiber coupler, 6-programmable optical filter, the multi-wavelength light source generator of 7-generation multi wave length illuminating source, 8-phase-modulator PM, 9-adjustable dispersion compensator, 10-the first Erbium-Doped Fiber Amplifier (EDFA) EDFA, 11-photodetector, 12-network analyzer.
Embodiment
The structural representation of multi-wavelength light source generator as shown in Figure 1, comprise second Erbium-Doped Fiber Amplifier (EDFA) 1, optoisolator 2, highly nonlinear optical fiber HNLF3, Polarization Controller 4,90:10 fiber coupler 5, pectination light filtering 6, comb optical filter 6 is programmable optical filter, and programmable optical filter can arrange number and the whole envelope of pectination passband neatly.High-power EDFA1 regulates its output power to excite the nonlinear effect in the highly nonlinear optical fiber as gain media, suppresses the mode competition of EDFA.Programmable optical filter 6 arranges number and the whole envelope of pectination passband as comb optical filter, the equally spaced lasing light emitter of final coupling output multi-wavelength.
As shown in Figure 2, the multi wave length illuminating source input microwave filtering device of multi-wavelength light source generator 7 generations.Described microwave filtering device comprises phase-modulator 8, adjustable dispersion compensator 9, the first Erbium-Doped Fiber Amplifier (EDFA)s 10, photodetector 11 and vector network analyzer 12.Multi-wavelength light enters phase-modulator through Polarization Controller, carries out the phase place modulation, and modulation signal is produced by port of network analyzer.After the modulation, through dispersion compensator each wavelength is introduced chromatic dispersion, enter the PD11 detection finally by crossing the EDFA10 amplification, the electric signal of detection enters network analyzer 12 another port.Suitably the output power of regulating networks analyser is tested the S parameter between the two-port, observes the response curve of microwave photon filter.By the dispersion values of wavelength number and change dispersion compensator is set, observe response curve and change accordingly then.
It should be noted last that, above embodiment is only unrestricted in order to technical scheme of the present invention to be described, although with reference to preferred embodiment the present invention is had been described in detail, those of ordinary skill in the art is to be understood that, can make amendment or be equal to replacement technical scheme of the present invention, and not breaking away from the spirit and scope of technical solution of the present invention, it all should be encompassed in the middle of the claim scope of the present invention.
Claims (6)
1. the microwave photon filter of a multi wave length illuminating source comprises multi-wavelength light source generator and microwave filtering device, it is characterized in that, described microwave filtering device comprises phase-modulator, adjustable dispersion compensator, first Erbium-Doped Fiber Amplifier (EDFA), photodetector and vector network analyzer; After the multi-wavelength light of described multi-wavelength light source generator output successively amplifies through described phase-modulator modulation, adjustable dispersion compensator, first Erbium-Doped Fiber Amplifier (EDFA), enter described photodetector and enter described network analyzer after by opto-electronic conversion; Described adjustable dispersion compensator is used for changing continuously between the adjacent wavelength of multi-wavelength light because the time delay that chromatic dispersion is introduced.
2. the microwave photon filter of multi wave length illuminating source according to claim 1, it is characterized in that, described multi-wavelength light source generator comprises comb optical filter, described comb optical filter is programmable optical filter, and described programmable optical filter is used for arranging neatly number and the whole envelope of pectination passband.
3. the microwave photon filter of multi wave length illuminating source according to claim 2 is characterized in that, described multi-wavelength light source generator also comprises second Erbium-Doped Fiber Amplifier (EDFA) and highly nonlinear optical fiber.
4. tuning methods according to the microwave photon filter of one of claim 1-3 described multi wave length illuminating source, it is characterized in that, by observing the response curve on the described network analyzer, adjust the dispersion values of described adjustable dispersion compensator, then change the time delay between the adjacent wavelength of adjacent multi-wavelength light continuously, realize the center continuously adjustable of described microwave photon filter.
5. the tuning methods of the microwave photon filter of multi wave length illuminating source according to claim 4, it is characterized in that, also comprise, by utilizing described programmable optical filter the number of pectination passband is set, change the number of outgoing wavelength, realize that the reconstruct of microwave photon filter bandwidth is regulated.
6. reconstructing method according to the microwave photon filter of claim 2 or 3 described multi wave length illuminating sources, it is characterized in that, comprise: by utilizing described programmable optical filter the number of pectination passband is set, changes the number of outgoing wavelength, realize the adjusting of microwave photon filter bandwidth.
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Cited By (13)
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| CN104048685A (en) * | 2014-07-01 | 2014-09-17 | 华中科技大学 | Quasi-distributed optical fiber sensing system based on spectrum limitation chaos optical signals |
| CN104333419A (en) * | 2014-09-25 | 2015-02-04 | 华中科技大学 | Tunable multi-wavelength light source and modulation method thereof |
| CN104898305A (en) * | 2015-06-25 | 2015-09-09 | 天津理工大学 | Variable-coefficient microwave photonic filter based on wavelength interval tunable laser |
| CN105846901A (en) * | 2016-03-11 | 2016-08-10 | 北京邮电大学 | High carrier-to-noise ratio optical carrier wireless system and method based on spectrum vector signal processing |
| 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 |
| CN107367880A (en) * | 2017-07-26 | 2017-11-21 | 中国科学院半导体研究所 | Microwave photon filter based on double parallel Mach zehnder modulators |
| CN108449132A (en) * | 2018-03-18 | 2018-08-24 | 肖世涛 | A kind of measurement method of high-accuracy light-adjustable filter wavelength tuning amount |
| CN111427172A (en) * | 2020-04-09 | 2020-07-17 | 大连理工大学 | Microwave photon filter based on spectrum segmentation light source |
| CN111948837A (en) * | 2020-08-24 | 2020-11-17 | 南京航空航天大学 | Microwave photon filtering method and microwave photon filtering device |
| CN112886372A (en) * | 2021-01-13 | 2021-06-01 | 电子科技大学 | Multi-port output multi-wavelength laser pulse generation system |
| CN113381815A (en) * | 2021-04-27 | 2021-09-10 | 中国人民解放军空军预警学院 | Dispersion-induced radio frequency power attenuation compensation method and system in optical fiber |
| CN113660039A (en) * | 2021-08-17 | 2021-11-16 | 广东工业大学 | Programmable controlled multi-dimensional multiplexing microwave photon filter and filtering method thereof |
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Cited By (19)
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| CN104048685A (en) * | 2014-07-01 | 2014-09-17 | 华中科技大学 | Quasi-distributed optical fiber sensing system based on spectrum limitation chaos optical signals |
| CN104048685B (en) * | 2014-07-01 | 2017-01-11 | 华中科技大学 | Quasi-distributed optical fiber sensing system based on spectrum limitation chaos optical signals |
| CN104333419A (en) * | 2014-09-25 | 2015-02-04 | 华中科技大学 | Tunable multi-wavelength light source and modulation method thereof |
| CN104898305A (en) * | 2015-06-25 | 2015-09-09 | 天津理工大学 | Variable-coefficient microwave photonic filter based on wavelength interval tunable laser |
| CN105846901B (en) * | 2016-03-11 | 2018-05-18 | 北京邮电大学 | A kind of method that high carrier-to-noise ratio light-carried wireless link is realized based on spectrum vector sensor signal processing technology |
| CN105846901A (en) * | 2016-03-11 | 2016-08-10 | 北京邮电大学 | High carrier-to-noise ratio optical carrier wireless system and method based on spectrum vector signal processing |
| 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 |
| 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 |
| CN107367880A (en) * | 2017-07-26 | 2017-11-21 | 中国科学院半导体研究所 | Microwave photon filter based on double parallel Mach zehnder modulators |
| CN107367880B (en) * | 2017-07-26 | 2019-12-03 | 中国科学院半导体研究所 | Microwave photon filter based on double parallel Mach zehnder modulators |
| CN108449132A (en) * | 2018-03-18 | 2018-08-24 | 肖世涛 | A kind of measurement method of high-accuracy light-adjustable filter wavelength tuning amount |
| CN111427172A (en) * | 2020-04-09 | 2020-07-17 | 大连理工大学 | Microwave photon filter based on spectrum segmentation light source |
| CN111948837A (en) * | 2020-08-24 | 2020-11-17 | 南京航空航天大学 | Microwave photon filtering method and microwave photon filtering device |
| CN112886372A (en) * | 2021-01-13 | 2021-06-01 | 电子科技大学 | Multi-port output multi-wavelength laser pulse generation system |
| CN112886372B (en) * | 2021-01-13 | 2021-11-09 | 电子科技大学 | Multi-port output multi-wavelength laser pulse generation system |
| CN113381815A (en) * | 2021-04-27 | 2021-09-10 | 中国人民解放军空军预警学院 | Dispersion-induced radio frequency power attenuation compensation method and system in optical fiber |
| CN113381815B (en) * | 2021-04-27 | 2022-09-02 | 中国人民解放军空军预警学院 | Dispersion-induced radio frequency power attenuation compensation method and system in optical fiber |
| CN113660039A (en) * | 2021-08-17 | 2021-11-16 | 广东工业大学 | Programmable controlled multi-dimensional multiplexing microwave photon filter and filtering method thereof |
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