CN103235374B - 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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- CN103235374B CN103235374B CN201310129413.5A CN201310129413A CN103235374B CN 103235374 B CN103235374 B CN 103235374B CN 201310129413 A CN201310129413 A CN 201310129413A CN 103235374 B CN103235374 B CN 103235374B
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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 of multi wave length illuminating source and tuning, reconstructing method thereof.
Background technology
Microwave photon filter is an important branch of Microwave photonics, and it utilizes optical means to carry out the optical system of filtering to microwave signal.Method based on optics is carried out process to microwave signal and can be utilized the Inherent advantages such as optical device is lightweight, volume is little, loss is little, it is roomy to be with, electromagnetism interference.In addition, based on the microwave filter of photon, also have tuning performance good, have the electronic microwave wave filters such as reconfigurability institute be not easy realization good characteristic, can electronic bottleneck be overcome.In recent years, along with the fast development of microwave photon filter, be widely used in microwave filtering, the fields such as photon mixing and transient microwave frequency measurement.From the light-source angle that microwave photon filter uses, single light source microwave photon filter and multiple light courcess microwave photon filter two class can be divided into.
Due to the horizontal miniwave photon filter of traditional multiple light courcess, tap coefficient is all positive, therefore there is baseband response, and what obtain is a low-pass filter instead of bandpass filter.Propose the transformation utilizing the phase place of phase-modulator to intensity (PM – IM) afterwards, can baseband response be eliminated, form the bandpass filter of equivalence.As everyone knows, the bandwidth based on the microwave photon filter of multi-wavelength depends on the number of tap, and Free Spectral Range (FSR) depends on wavelength interval between tap and dispersive medium.But be limited to the factors such as number of taps, wavelength interval and dispersive medium, based on the microwave photon filter of multiple light courcess in tunability and reconfigurability, there is certain deficiency.
Summary of the invention
Technical matters to be solved by this invention is to provide 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; The multi-wavelength light that described multi-wavelength light source generator exports successively, after described phase modulator modulation, adjustable dispersion compensator, the first Erbium-Doped Fiber Amplifier (EDFA) amplify, enters after described photodetector is photoelectrically converted and enters described network analyzer; Described adjustable dispersion compensator, for changing the time delay due to dispersion introducing between the adjacent wavelength of multi-wavelength light continuously.The phase place that described phase-modulator has, to the changing function of intensity, to eliminate baseband response, makes described microwave filtering device form the bandpass filter of equivalence.
Preferred technical scheme is that described multi-wavelength light source generator comprises comb optical filter further, and described comb optical filter is programmable optical filter, and described programmable optical filter is used for arranging the number of pectination passband and whole envelope neatly.
Described multi-wavelength light source generator also comprises the second Erbium-Doped Fiber Amplifier (EDFA) and highly nonlinear optical fiber.High-power second erbium-doped optical fiber amplifier EDFA is as gain media, and the nonlinear effect of highly nonlinear optical fiber suppresses the mode competition of EDFA, realizes the adjustable multi wave length illuminating source of stable 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-modulation is as follows:
Wherein χ represents the dispersion values introduced by dispersion compensator,
represent the centre wavelength of multi wave length illuminating source, Δ λ represents adjacent wavelength interval, and f is the microwave frequency of modulation, P
nrepresent the luminous power of the n-th wavelength.The response function of whole system can be divided into H
1(f), H
2(f) two parts, H
1f () represents the response function that phase-modulation changes to intensity, first peak value is positioned at
there is depression at direct current place, this causes because phase-modulation first order side band exists reversed nature.H
2f () represents typical many taps positive coefficient horizontal miniwave photon filter response function, have periodic response curve, FSR=1 Δ λ χ.Utilize phase-modulation phase place to the transformation of intensity, can eliminate baseband response, the band forming equivalence leads to microwave photon filter.
Tunability: refer to that the bandpass center of microwave photon filter can regulate.That is with logical microwave photon filter is centrally located at 1 Δ λ χ.The present invention utilizes the continuously adjustable dispersion compensator of dispersion values as dispersive medium, by changing the dispersion values of dispersion compensator, just within the specific limits, can realize the continuously adjustable of bandpass center.
Reconfigurability: refer to that the passband shapes of microwave photon filter can regulate.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, and the bandwidth of microwave photon filter is narrower.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 adjustment of microwave photon filter bandwidth.In addition, by arranging the envelope of whole smooth pectination passband, being equivalent to windowing, the main side valve suppression ratio (MSR) of microwave photon filter can also be changed.
Invention also provides the tuning methods of above-mentioned microwave photon filter, comprise: by observing the response curve on network analyzer, adjust the dispersion values of adjustable dispersion compensator, then change the time delay due to dispersion introducing between 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 the number utilizing programmable optical filter to arrange pectination passband, changes the number of outgoing wavelength, realizes the adjustment of microwave photon filter bandwidth.
The present invention proposes tunable dispersion compensator first as dispersive medium, programmable optical filter is have employed in multi-wavelength light source generator, achieve the tunable of microwave photon filter and reconfigurability, can more flexibly for microwave signal process system.
Accompanying drawing explanation
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.
In figure, the 1-the second erbium-doped optical fiber amplifier 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, the 10-the first erbium-doped optical fiber amplifier EDFA, 11-photodetector, 12-network analyzer.
Embodiment
The structural representation of multi-wavelength light source generator as shown in Figure 1, comprise the 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 the number of pectination passband and whole envelope neatly.High-power EDFA1, as gain media, regulates its output power to excite the nonlinear effect in highly nonlinear optical fiber, suppresses the mode competition of EDFA.Programmable optical filter 6, as comb optical filter, arranges the number of pectination passband and whole envelope, the equally spaced lasing light emitter of final coupling output multi-wavelength.
As shown in Figure 2, the multi wave length illuminating source that multi-wavelength light source generator 7 produces inputs microwave filtering device.Described microwave filtering device comprises phase-modulator 8, adjustable dispersion compensator 9, first Erbium-Doped Fiber Amplifier (EDFA) 10, photodetector 11 and vector network analyzer 12.Multi-wavelength light enters phase-modulator through Polarization Controller, carries out phase-modulation, and modulation signal is produced by network analyzer port.After modulation, introduce dispersion through dispersion compensator to each wavelength, eventually pass EDFA10 amplification and enter PD11 detection, the electric signal of detection enters network analyzer 12 another port.The output power of suitable regulating networks analyser, the S parameter between test two-port, observes the response curve of microwave photon filter.Then by arranging the dispersion values of wavelength number and change dispersion compensator, observing response curve and changing accordingly.
It should be noted last that, above embodiment is only in order to illustrate technical scheme of the present invention and unrestricted, although with reference to preferred embodiment to invention has been detailed description, those of ordinary skill in the art is to be understood that, can modify to technical scheme of the present invention or equivalent replacement, and not departing from the spirit and scope of technical solution of the present invention, it all should be encompassed in the middle of right of the present invention.
Claims (3)
1. the tuning methods of the microwave photon filter of a 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; It is characterized in that, the multi-wavelength light that described multi-wavelength light source generator exports successively, after described phase modulator modulation, adjustable dispersion compensator, the first Erbium-Doped Fiber Amplifier (EDFA) amplify, enters after described photodetector is photoelectrically converted and enters described vector network analyzer;
By observing the response curve on described vector 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.
2. the tuning methods of 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, described programmable optical filter arranges the number of pectination passband and the envelope of pectination passband neatly, and the reconstruct realizing microwave photon filter bandwidth regulates.
3. the tuning methods of 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 the second Erbium-Doped Fiber Amplifier (EDFA) and highly nonlinear optical fiber.
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| 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 |
| 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 |
| 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 |
| 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 |
| CN108449132B (en) * | 2018-03-18 | 2021-01-26 | 中山市威晟光通科技有限公司 | Method for measuring wavelength tuning quantity of high-precision tunable optical filter |
| CN111427172A (en) * | 2020-04-09 | 2020-07-17 | 大连理工大学 | Microwave photon filter based on spectrum segmentation light source |
| CN111948837B (en) * | 2020-08-24 | 2021-08-13 | 南京航空航天大学 | Microwave photon filtering method and microwave photon filtering device |
| CN112886372B (en) * | 2021-01-13 | 2021-11-09 | 电子科技大学 | Multi-port output multi-wavelength laser pulse generation system |
| 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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| US20090207470A1 (en) * | 2008-01-08 | 2009-08-20 | Vance Joseph D | Two-photon-absorption optical filter |
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