CN101478108B - Method and apparatus for enhancing purity of microwave spectrum generated by rational number harmonic mode lock laser - Google Patents
Method and apparatus for enhancing purity of microwave spectrum generated by rational number harmonic mode lock laser Download PDFInfo
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Abstract
The invention discloses a method for improving the purity of microwave spectrum generated by a rational harmonic mode-locked laser and a device thereof. A comb filter with the characteristics of periodic filtration is adopted between the rational harmonic mode-locked laser and a photodetector. The comb filter filtrates the output spectra of the rational harmonic mode-locked laser and removes unnecessary low-order harmonic waves, and improves the spectrum purity of high-frequency microwave signals through beat frequency.
Description
Technical field
The present invention relates to photoelectron and microwave photon and learn the field, especially relate to a kind of raising purity of microwave spectrum generated by rational number harmonic mode lock laser method and device.
Background technology
Along with the fast development of information technology, the every aspects such as national defense construction of people's productive life, country all grow with each passing day to the demand of information.Simultaneously, the kind of information also is tending towards variation, as data, voice, video, multimedia etc.The bandwidth of the surge inevitable requirement communication system of data volume improves thereupon.As the most frequently used instrument of communication, wireless communication system is in equal extensive application in aspect such as data service, voice, radars.In wireless communication system,, just must improve the operating frequency of wireless carrier in order to obtain higher message transmission rate.The operating frequency of present most of radio communication services all concentrates on below the 5GHz, if adopt high-frequency microwave signal as carrier wave, power system capacity will be promoted greatly.On the other hand, (Radio-over-Fiber, RoF) the continuous development of technology and trend are ripe, have solved the excessive problem of high-frequency microwave loss in atmosphere, make the fusion development that gos deep into of optical fiber and radio communication become possibility along with optical fiber radio communication.Under this background, become more urgent for the demand of high-frequency microwave.
Because the restriction of electronic bottleneck, the microwave signal frequency that electrical method produces are difficult to promote.By contrast, optical means is unrestricted on frequency, becomes an important channel that produces high-frequency microwave signal.The optical generation method of high-frequency microwave has multiple, and wherein utilizing the longitudinal mode of rational number harmonic mode-locking laser output is one of basic production method by beat frequency generation high-frequency microwave.In this method, because there is low-order harmonic inevitably in the output spectrum of rational number harmonic mode-locking laser, these harmonic waves can produce other low frequency microwave by beat frequency, form noise.Therefore, take effective ways that the output spectrum of rational number harmonic mode-locking laser is handled, thereby it is very necessary to improve the microwave spectrum purity that produces.
Summary of the invention
The object of the present invention is to provide a kind of raising purity of microwave spectrum generated by rational number harmonic mode lock laser method and device.
The technical solution used in the present invention is:
One, a kind of method that improves purity of microwave spectrum generated by rational number harmonic mode lock laser:
The comb filtering device that employing has a periodic filter characteristic carries out filtering to the output spectrum of rational number harmonic mode-locking laser, removes unnecessary low-order harmonic, obtains the high-frequency microwave signal of high spectrum purity then by beat frequency.
Two, a kind of device that improves purity of microwave spectrum generated by rational number harmonic mode lock laser:
This device comprises rational number harmonic mode-locking laser, photodetector and has the comb filter of periodic filter characteristic; Between rational number harmonic mode-locking laser and photodetector, introduce comb filtering apparatus with periodic filter characteristic.
Described comb filter is Mach-Zehnder interferometer, Sagnac ring or Fabry Perot resonator.
The beneficial effect that the present invention has is:
The comb filtering device that employing has a periodic filter characteristic carries out effective filtering to the output spectrum of rational number harmonic mode-locking laser, removes low-order harmonic, has improved the spectral purity of high-frequency microwave signal by beat frequency.
Description of drawings
Fig. 1 is the method schematic diagram that improves purity of microwave spectrum generated by rational number harmonic mode lock laser.
Fig. 2 is the device schematic diagram that improves purity of microwave spectrum generated by rational number harmonic mode lock laser.
Fig. 3 is the output pulse diagram of rational number harmonic mode-locking laser.
Fig. 4 is the output spectrum figure of rational number harmonic mode-locking laser.
Fig. 5 is the spectrogram that the direct beat frequency of output light of rational number harmonic mode-locking laser obtains.
Fig. 6 is the transmission spectrum of comb filter.
Fig. 7 is filtered rational number harmonic mode-locking laser output pulse diagram.
Fig. 8 is filtered rational number harmonic mode-locking laser output spectrum figure.
Fig. 9 is the spectrogram that the output light of rational number harmonic mode-locking laser obtains through beat frequency after the filtering.
Among the figure: 1. Polarization Controller, 2. electrooptic modulator, 3. low frequency signal source, 4. image intensifer, 5. isolator, 6. filter, 7. coupler/beam splitter, 8. comb filter, 9. photodetector.
Embodiment
The method of the microwave spectrum purity that the raising rational number harmonic mode-locking laser that the present invention proposes produces can be described with system block diagram shown in Figure 1, optical beat before taking place in the output spectrum of rational number harmonic mode-locking laser, at first pass through comb filter filtering, the cycle of regulating filter is consistent with the repetition rate of laser, fully the filtering low-order harmonic can obtain highly purified microwave spectrum by optical beat then.
According to principle shown in Figure 1, the device of the microwave spectrum purity that raising rational number harmonic mode-locking laser produces has been introduced the comb filter 8 with periodic filter characteristic as shown in Figure 2 between rational number harmonic mode-locking laser and photodetector 9.Part among Fig. 2 shown in the block diagram is a kind of structure of rational number harmonic mode-locking laser, comprises Polarization Controller 1, intensity modulator 2, low frequency signal source 3, image intensifer 4, isolator 5, filter 6, coupler/beam splitter 7.In this laser, apply the drive signal f of a low frequency by intensity modulator 2
Mod, adjust this signal frequency and make it depart from basic chamber frequency f
CavIntegral multiple f
Cav/ p, i.e. f
Mod=(the f of n ± 1/p)
Cav, wherein n, p are positive integer, and then the repetition rate of laser output pulse sequence is (np ± 1) f
Cav=pf
Mod, the p that is driving signal frequency doubly.The output laser of rational number harmonic mode-locking laser is carried out optical beat on photodetector, the microwave frequency of generation is identical with the repetition rate of laser pulse, also is pf
ModBut, in the rational number harmonic mode-locking laser, because the loss difference that each pulse is experienced, thereby have the unbalanced problem of output pulse amplitude, being embodied on the frequency domain is exactly to export the frequency spectrum of pulse except rational harmonic wave pf
ModOutside, also there are other low-order harmonics.Utilize such laser output carrying out beat frequency, its result be exactly in the microwave signal that produces except needed high-frequency signal, also have other low frequency microwave noises, thereby influence produces the purity of microwave signal.
Can be improved by filtering by the microwave signal spectral purity that the rational number harmonic mode-locking laser produces.Adopt a comb filter, for example Mach-Zehnder interferometer, Sagnac ring, Fabry Perot resonator etc. are regulated the relevant parameter of comb filter, and the cycle of the feasible filtering spectrum that produces is pf just
Mod, then can effectively suppress the low-order harmonic in the rational number harmonic mode-locking laser output spectrum, observing from time domain is exactly that the amplitude of pulse has obtained equilibrium.Through after the filter, on photodetector, carry out the microwave signal that beat frequency can obtain high spectrum purity.
Embodiment 1:
In a chamber is about rational number harmonic mode-locking laser into 45.4m, when being 2.495GHz, the driving signal frequency that applies on the modulator (is equivalent to 566 subharmonic), can obtain conventional active mode locking laser pulse.With 1/4 of the frequency shift base chamber frequency of drive signal, by rational number harmonic mode-locking, can obtain the pulse output that a repetition rate is about 10GHz, its time domain waveform and frequency spectrum are respectively as shown in Figure 3 and Figure 4.Directly at the photodetector upper beat frequency, the microwave spectrum that obtains as shown in Figure 5 with this laser pulse.As seen, because the unbalanced decline that has caused producing microwave signal purity of pulse strength.
Embodiment 2:
After the output of rational number harmonic mode-locking laser in embodiment 1, adopt a Mach-Zehnder interferometer to carry out filtering, the transmission spectrum of this interferometer as shown in Figure 6, its cycle is about 10GHz, matches with the rational harmonic frequency of laser.Through after the filtering, the time domain waveform of pulse and frequency spectrum are respectively as shown in Figure 7 and Figure 8.At the photodetector upper beat frequency, the microwave spectrum that obtains as shown in Figure 9 with filtered laser pulse.As seen, the filtering by comb filter has effectively suppressed the low-order harmonic in the output pulse, realized the equilibrium of pulse strength, thereby the microwave signal spectral purity that makes beat frequency produce improves greatly.
In the present invention, Polarization Controller, electrooptic modulator, low frequency signal source, image intensifer, all can select various commercialization components and parts for use for isolator, filter, coupler/beam splitter, comb filter and photodetector.
Claims (3)
1. method that improves purity of microwave spectrum generated by rational number harmonic mode lock laser, it is characterized in that: adopt comb filtering device that the output spectrum of rational number harmonic mode-locking laser is carried out filtering with periodic filter characteristic, remove unnecessary low-order harmonic, obtain the high-frequency microwave signal of high spectrum purity then by beat frequency.
2. the device that is used for the described raising purity of microwave spectrum generated by rational number harmonic mode lock laser of claim 1 method, comprise rational number harmonic mode-locking laser, photodetector (9) and have the comb filter (8) of periodic filter characteristic, it is characterized in that: between rational number harmonic mode-locking laser and photodetector (9), introduce comb filter (8) with periodic filter characteristic.
3. the device of raising purity of microwave spectrum generated by rational number harmonic mode lock laser method according to claim 2 is characterized in that: described comb filter (8) is Mach-Zehnder interferometer, Sagnac ring or Fabry Perot resonator.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR3111023A1 (en) * | 2020-05-28 | 2021-12-03 | Thales | Device for generating radiofrequency pulse trains |
| WO2022251057A1 (en) * | 2021-05-26 | 2022-12-01 | Raytheon Company | High power mmw synthesizer with truly continuous ultra wide bandwidth tuning range |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109520637B (en) * | 2019-01-23 | 2021-04-02 | 国网江西省电力有限公司信息通信分公司 | Temperature sensing demodulation device and demodulation method based on mode-locked fiber laser |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR3111023A1 (en) * | 2020-05-28 | 2021-12-03 | Thales | Device for generating radiofrequency pulse trains |
| WO2022251057A1 (en) * | 2021-05-26 | 2022-12-01 | Raytheon Company | High power mmw synthesizer with truly continuous ultra wide bandwidth tuning range |
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