CN102608825A - Method and system for realizing multi-frequency optical comb - Google Patents
Method and system for realizing multi-frequency optical comb Download PDFInfo
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Abstract
The invention discloses a method and a system for realizing multi-frequency optical comb. The method comprises the following steps: (1) a pulse laser outputs two or more optical pulse trains with different center wavelengths and different repetition frequencies, the maximum value of full width at half maximum of the neighboring optical pulse trains with different center wavelengths in the spectra being smaller than the difference of the center wavelengths; and (2) the optical pulse trains outputted by the pulse laser are subjected to a nonlinear optical process to widen the spectra of one or more optical pulse trains with different center wavelengths in the optical pulse trains, so that the spectra of the optical pulse trains with different center wavelengths overlap to form two or more optical combs with different repetition frequencies in the wavelength region of the overlapping spectra. According to the invention, the method can generate a multi-frequency optical comb by use of a multi-wavelength pulse laser, and the system is simple and low in cost, and is easy in stabilizing frequency difference.
Description
Technical field
The present invention relates to light comb field, relate in particular to a kind of method and system of realizing multifrequency light comb.
Background technology
The light comb is the light signal that a series of frequency components with fixed frequency difference in the frequency range of light wave constitute.Double frequency light comb (Dual-comb) or multifrequency light comb (Multi-comb) then be by two or more that in certain spectral range, exist have near but light tree structures of different difference on the frequency become.Multifrequency light comb system needs to export multifrequency light comb with single channel or more than the two-way.Multifrequency light comb has the prospect in a plurality of fields such as the frequency spectrum detection of being applied to, sensor measuring.
Light comb system often produces through a mode locking pulse laser instrument at present, comprises the fine femto-second laser of erbium, the fine femto-second laser of ytterbium, titanium jewel solid state laser and Gr:ZnSe solid state laser etc.Have very accurately periodic short pulse sequence because mode locking pulse can produce, the spectrum of this pulse train then is to be become by the light tree structure with repetition frequency that difference on the frequency equals pulse train.At present, proposed and the multifrequency light realized comb system all through adopting a plurality of mode locking pulse laser instruments to produce.In order to realize different difference on the frequencies, present technology all is to grow slightly different mode locking pulse laser instruments through the two or more similar but chambeies of locking and meticulous adjusting and FEEDBACK CONTROL in real time to realize.Two Er-doped fiber femto-second lasers of uses such as Liu in the Coddington of National Institute of Standards and Technology etc., Taiwan have produced double frequency light comb.Two titanium jewels of uses such as the Bartels of Uni Konstanz femto-second laser has produced double frequency light comb.Owing to use a plurality of mode-locked lasers, the cost of system is very expensive.Simultaneously in order between two laser instruments, to realize the small and stable difference on the frequency much lower with respect to pulse repetition rate; Usually need feedback control circuit very accurately; Make that system is complicated more, cost is higher, equipment volume is big and the chamber journey by raft down the Yangtze River such as is moved at relatively sensitivity; The demonstration that can only in high-end laboratory, experimentize at present is unfavorable for the practical application of system.
Summary of the invention
To the problems referred to above that exist in the prior art, the invention provides a kind of method and system that generates multifrequency light comb.
The invention provides a kind of method that generates multifrequency light comb, comprising:
Step 1, pulsed laser output have different centre wavelengths and different repetition frequencys more than two and two light pulse sequence, the maximal value of the full width at half maximum of the light pulse sequence of adjacent different centre wavelengths poor less than its centre wavelength in the spectrum;
Step 2; Light pulse sequence process nonlinear optical process with pulsed laser output with different centre wavelengths and different repetition frequencys; Make the light pulse sequence generation spectrum widening of the one or more different centre wavelengths in the light pulse sequence; Making that the spectrum of the light pulse sequence of different centre wavelengths produces behind the broadening overlaps, thus the light comb that in the wavelength region may that spectrum overlaps, has two or more different repetition frequencys.
In one example; The light pulse sequence that will have different centre wavelengths and different repetition frequencys in the step 2 is together simultaneously through the identical element that can produce nonlinear optical process; Spectrum widening takes place, and makes that the spectrum of first light pulse sequence and the spectrum of second light pulse sequence overlap behind the broadening.
In one example, step 2 further is divided into again:
Step 21; Light-splitting device is divided into first light pulse sequence and second light pulse sequence with the light pulse sequence of pulsed laser output; The centre wavelength of first light pulse sequence is first wavelength; The repetition frequency of first light pulse sequence is a first frequency, and the centre wavelength of second light pulse sequence is second wavelength, and the repetition frequency of second light pulse sequence is a second frequency;
Step 22, separated first light pulse sequence and/or second light pulse sequence pass through nonlinear optical process respectively, and spectrum widening takes place, and make that the spectrum of first light pulse sequence and the spectrum of second light pulse sequence overlap behind the broadening.
In one example, nonlinear optical process is based on four-wave mixing, from the nonlinear optical process of the modulation of phase modulation (PM), cross-phase, stimulated Raman scattering effect or its various combination.
The invention provides a kind of multifrequency light and comb system, comprising:
A pulsed laser; Export two or more light pulse sequences with different centre wavelengths; The maximal value of the full width at half maximum of the light pulse sequence of adjacent different centre wavelengths poor less than its centre wavelength in the spectrum; Average group velocity in the laser cavity of pulsed laser is inequality to different output center wavelengths, thereby the repetition frequency of the light pulse sequence of different centre wavelengths is different;
The light pulse sequence of pulsed laser output is through nonlinear optical system; Make the light pulse sequence generation spectrum widening of the one or more different centre wavelengths in the light pulse sequence, make that the spectrum of the light pulse sequence of different centre wavelengths produces behind the broadening to overlap.
In one example, nonlinear optical system comprises:
Nonlinear optical element is used for the light pulse sequence generation spectrum widening of one or more different centre wavelengths of light pulse sequence, makes that the spectrum of the light pulse sequence of different centre wavelengths produces behind the broadening to overlap.
In one example, nonlinear optical system comprises:
Light-splitting device is used for the light pulse sequence of pulsed laser output is divided into a plurality of light pulse sequences.The centre wavelength of each light pulse sequence is different, and the full width at half maximum of spectrum is poor less than the adjacent center wavelength;
Nonlinear optical element is used for the light pulse sequence generation spectrum widening of one or more different centre wavelengths of light pulse sequence, makes that the spectrum of the light pulse sequence of different centre wavelengths produces behind the broadening to overlap.
In one example, the cavity structure of pulsed laser is line style chamber, folded cavity, ring cavity and figure of eight chamber.
In one example, pulsed laser is active mode laser instrument, laser with active-passive lock mould or mixes mode-locked laser.
In one example, nonlinear optical element is single-mode transmission optical fiber, highly nonlinear optical fiber, gain fibre, photonic crystal fiber or nonlinear optics integrated waveguide.
In one example, light-splitting device is fiber coupler, beam splitter prism, beam splitting chip, optical filter, BPF. or wavelength division multiplexer.
The present invention can utilize a multi-wavelength pulsed laser; Difference through the group velocity between the different wave length signal in design and the realization laser chamber; Realization has the output of the pulse train of different repetition frequencys, different centre wavelengths; But the spectrum component with the pulse train on the different centre wavelengths is in the different wavelengths scope basically, and it is very little to overlap.Through utilizing four-wave mixing, coming the spectrum of stretched pulse sequence, then can on the zone that overlaps on the spectrum, produce light comb with different frequency difference from nonlinear optical effects such as phase modulation (PM), mutual position modulation, stimulated Raman scatterings.The method and system that the present invention relates to only needs a laser instrument, and cost is low, and volume is little, and the frequency difference of the light comb of generation is by the decision of the GVD in the laser chamber, and it is little to receive the chamber journey by raft down the Yangtze River to move the influence of variation, practical application more easily.The light comb that this method and system produces also can carry out frequency lock through existing light comb technology, and produces more stable light comb.
Description of drawings
Come the present invention is done further explain below in conjunction with accompanying drawing, wherein:
Fig. 1 is a kind of system construction drawing of multifrequency light comb; The light pulse sequence with different centre wavelengths and different repetition frequencys of multi-wavelength pulsed laser output; Through behind the nonlinear optical system; Light pulse sequence generation spectrum widening makes that the spectrum of the light pulse sequence of different centre wavelengths produces behind the broadening to overlap, thus the light comb that in the wavelength region may that spectrum overlaps, has two or more different repetition frequencys.
Fig. 2 is the another kind of system construction drawing of multifrequency light comb; The light pulse sequence that the output of multi-wavelength pulsed laser has different centre wavelengths and different repetition frequencys; Through behind the light-splitting device, be divided into centre wavelength and frequency two light pulse sequences all inequality, at least one road is through nonlinear optical element in the two paths of signals; Make the spectrum of this road signal obtain broadening, the spectrum of latter two light pulse sequence of broadening overlaps.
Fig. 3 is the system construction drawing of multi-wavelength pulsed laser;
Fig. 4 adopts the multi-wavelength pulsed laser to realize the system construction drawing of multifrequency light comb;
Fig. 5 is multi-wavelength pulsed laser output spectrum figure;
Fig. 6 is the spectrogram of multi-wavelength pulsed laser output through the signal after the light-to-current inversion;
Fig. 7 is that the centre wavelength that multi-wavelength pulsed laser output light is exported behind wave filter is the spectrogram of the light pulse of 1535nm;
Fig. 8 is that the centre wavelength that multi-wavelength pulsed laser output light is exported behind wave filter is the spectrogram of the light pulse of 1557nm;
Fig. 9 be with centre wavelength be the light pulse of 1557nm through image intensifer and single-mode transmission optical fiber, carry out the spectrogram behind power amplification and the spectrum widening;
Figure 10 is that the former centre wavelength behind the spectrum widening is that the light pulse of 1557nm is the spectrogram of output light behind the BPF. of 1528nm-1536nm through passband;
Figure 11 is the spectrogram after output amplifier and the single-mode transmission optical fiber of multi-wavelength pulsed laser carried out power amplification and spectrum widening;
Figure 12 is the spectrogram of the signal of output after the process light-to-current inversion of the comb of the realization multifrequency light after amplifier and the Transmission Fibers of multi-wavelength pulsed laser;
Embodiment
Instance one
The multi-wavelength mode-locked laser that uses in this instance comes gain characteristic in the tuning cavity through the loss in the control chamber, makes that the gain at different wave length place is identical, and then realizes the pulse laser output of multi-wavelength.The structure of laser instrument is as shown in Figure 3, and laser instrument is for adopting the optical fiber laser with active-passive lock mould of ring cavity structure.Pump light source is the semiconductor laser 303 of wavelength 1480nm, and the pump light that is sent is coupled into 5 meters long Er-doped fibers (EDF) 301 through 1480/1550 wavelength division multiplexer 302.This EDF is 6.1dB/m at the absorption coefficient of 1530nm.EDF connects optoisolator 308, guarantees light one way propagation in optical fiber cavity.Add Polarization Controller 306 in the chamber and control polarization state.Locked mode device in the chamber is a carbon nano tube/polyamide 6 imines film 303, and film thickness is 40 microns, and the loss that sandwiches behind the FC/PC joint is about 3.5dB, and the total length of general single mode fiber 304 is 6.1m in the chamber.80/20 fiber coupler 307 outputs to 20% laser in the chamber outside the chamber, in 80% the laser return cavity.Loss in the chamber make EDF 1530 and 1560nm near have two gain peak, satisfy the condition that dual wavelength produces.The centre wavelength that realizes the dual wavelength locked mode is respectively 1535nm and 1557nm, and the spectrum that obtains is as shown in Figure 5.Use quick optical electric explorer and frequency spectrograph to detect the spectrogram of exporting pulse, as shown in Figure 6.Owing to the chromatic dispersion that devices such as optical fiber in optical fiber cavity exist, the group velocity of two wavelength is different, so the repetition frequency of the light pulse sequence of these two different wave lengths (being the difference on the frequency of light comb) is also different.From spectrogram, can see the repetition frequency f of 1535nm wavelength pulse
1Be 14.489145MHz, and the repetition frequency f of 1557nm wavelength pulse
2Be 14.488649MHz, difference on the frequency Δ f is 496Hz.The output of dual laser 401 is leached two pulse trains that centre wavelength is respectively 1535nm and 1557nm by beam split filtering device 403 respectively at two output ports after fiber amplifier 402 amplifies, its spectrogram is respectively like Fig. 7 and shown in Figure 8.The light pulse sequence of 1557nm utilizes the third-order non-linear effect (from phase modulation (PM), four-wave mixing etc.) in gain fibre and the single-mode transmission optical fiber to realize spectrum widening through fiber amplifier 404 and single-mode transmission optical fiber 405, and spectrum is as shown in Figure 9.Behind filter filtering 406, near the spectral components the 1535nm is shown in figure 10.Thereby this system has realized two-way simultaneously and has had the light comb output of different frequency difference in the wavelength coverage near 1535nm.The effect of the image intensifer in the system is an amplifying optical signals; Making it spectrum behind broadening can be produced with the spectrum of other one road signal through nonlinear effect overlaps; But image intensifer not necessarily, particularly before amplification, just is enough to make spectrum to produce situation about overlapping for light signal.
Instance two
This instance adopts the multi-wavelength mode-locked laser identical with instance one.Its output is directly through amplifier and single-mode transmission optical fiber; Utilize the third-order non-linear effect (from phase modulation (PM), four-wave mixing etc.) in gain fibre and the single-mode transmission optical fiber; Make the light pulse sequence generation spectrum widening of the different centre wavelengths in the light pulse sequence; Making that the spectrum of the light pulse sequence of different centre wavelengths produces behind the broadening overlaps, thus the light comb that in the wavelength region may that spectrum overlaps, has two kinds of different frequency differences, and the spectrum behind its broadening is shown in figure 11; The frequency spectrum of the signal of spectrum overlapping region after opto-electronic conversion is shown in figure 12, can find out that system has realized having the light comb output of different frequency difference simultaneously.The effect of the image intensifer in the system is an amplifying optical signals, make it spectrum behind broadening produced and overlap through nonlinear effect, image intensifer not necessarily, if particularly light signal just is enough to make spectrum to produce before amplification to overlap.
The above is merely preferred implementation of the present invention, but protection domain of the present invention is not limited thereto.Any those skilled in the art all can carry out suitable change or variation to it in technical scope disclosed by the invention, and this change or variation all should be encompassed within protection scope of the present invention.
Claims (10)
1. a method that realizes multifrequency light comb is characterized in that, comprising:
Step 1, pulsed laser output have different centre wavelengths and different repetition frequencys more than two and two light pulse sequence, the maximal value of the full width at half maximum of the light pulse sequence of adjacent different centre wavelengths poor less than its centre wavelength in the spectrum;
Step 2; Light pulse sequence process nonlinear optical process with pulsed laser output with different centre wavelengths and different repetition frequencys; Make the light pulse sequence generation spectrum widening of the one or more different centre wavelengths in the light pulse sequence; Making that the spectrum of the light pulse sequence of different centre wavelengths produces behind the broadening overlaps, thus the light comb that in the wavelength region may that spectrum overlaps, has two or more different repetition frequencys.
2. the production method of multifrequency light comb as claimed in claim 1; It is characterized in that; The light pulse sequence that has different centre wavelengths and different repetition frequencys in the said step 2 is together simultaneously through the identical element that can produce nonlinear optical process; Spectrum widening takes place, and makes that the spectrum of first light pulse sequence and the spectrum of second light pulse sequence overlap behind the broadening.
3. the method for realization multifrequency light comb as claimed in claim 1 is characterized in that said step 2 further is divided into again:
Step 21; Light-splitting device is divided into first light pulse sequence and second light pulse sequence with the light pulse sequence of pulsed laser output; The centre wavelength of first light pulse sequence is first wavelength; The repetition frequency of first light pulse sequence is a first frequency, and the centre wavelength of second light pulse sequence is second wavelength, and the repetition frequency of second light pulse sequence is a second frequency;
Step 22, separated first light pulse sequence and/or second light pulse sequence pass through nonlinear optical process respectively, and spectrum widening takes place, and make that the spectrum of first light pulse sequence and the spectrum of second light pulse sequence overlap behind the broadening.
4. the production method of multifrequency light as claimed in claim 1 comb is characterized in that, said nonlinear optical process be based on four-wave mixing, from phase modulation (PM), cross-phase modulate, the nonlinear optical process of stimulated Raman scattering effect or its various combination.
5. a multifrequency light comb system is characterized in that, comprising:
A pulsed laser; Export two or more light pulse sequences with different centre wavelengths; The maximal value of the full width at half maximum of the light pulse sequence of adjacent different centre wavelengths poor less than its centre wavelength in the spectrum; Average group velocity in the laser cavity of pulsed laser is inequality to different output center wavelengths, thereby the repetition frequency of the light pulse sequence of different centre wavelengths is different;
The light pulse sequence of pulsed laser output is through nonlinear optical system; Make the light pulse sequence generation spectrum widening of the one or more different centre wavelengths in the light pulse sequence, make that the spectrum of the light pulse sequence of different centre wavelengths produces behind the broadening to overlap.
6. multifrequency light as claimed in claim 5 is combed system, it is characterized in that nonlinear optical system comprises:
Nonlinear optical element is used for the light pulse sequence generation spectrum widening of one or more different centre wavelengths of light pulse sequence, makes that the spectrum of the light pulse sequence of different centre wavelengths produces behind the broadening to overlap.
7. multifrequency light as claimed in claim 5 is combed system, it is characterized in that nonlinear optical system comprises:
Light-splitting device is used for the light pulse sequence of pulsed laser output is divided into a plurality of light pulse sequences.The centre wavelength of each light pulse sequence is different, and the full width at half maximum of spectrum is poor less than the adjacent center wavelength;
Nonlinear optical element is used for the light pulse sequence generation spectrum widening of one or more different centre wavelengths of light pulse sequence, makes that the spectrum of the light pulse sequence of different centre wavelengths produces behind the broadening to overlap.
8. multifrequency light as claimed in claim 5 is combed system, it is characterized in that, said pulsed laser is active mode laser instrument, laser with active-passive lock mould or mixes mode-locked laser.
9. comb system like claim 6 and 7 described multifrequency light, it is characterized in that said nonlinear optical element is single-mode transmission optical fiber, highly nonlinear optical fiber, gain fibre, photonic crystal fiber or nonlinear optics integrated waveguide.
10. multifrequency light as claimed in claim 7 is combed system, it is characterized in that said light-splitting device is fiber coupler, beam splitter prism, beam splitting chip, optical filter, BPF. or wavelength division multiplexer.
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| CN201210052680.2A CN102608825B (en) | 2012-03-02 | 2012-03-02 | Method and system for realizing multi-frequency optical comb |
| PCT/CN2013/072093 WO2013127370A1 (en) | 2012-03-02 | 2013-03-01 | Method and system for measuring optical asynchronous sampled signal |
| US14/382,333 US9250128B2 (en) | 2012-03-02 | 2013-03-01 | Method and apparatus for optical asynchronous sampling signal measurements |
| US14/475,434 US9273994B2 (en) | 2012-03-02 | 2014-09-02 | Method and apparatus for optical asynchronous sampling signal measurements |
| US14/968,289 US9863815B2 (en) | 2012-03-02 | 2015-12-14 | Method and apparatus for multifrequency optical comb generation |
| US14/968,237 US9885614B2 (en) | 2012-03-02 | 2015-12-14 | Method and apparatus for multifrequency optical comb generation |
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| WO2013127370A1 (en) * | 2012-03-02 | 2013-09-06 | 北京航空航天大学 | Method and system for measuring optical asynchronous sampled signal |
| CN104765218A (en) * | 2015-04-10 | 2015-07-08 | 中国科学院半导体研究所 | Tunable optical frequency comb generation system based on single-chip integrated microcavity laser |
| CN104765217A (en) * | 2015-04-09 | 2015-07-08 | 中国科学院半导体研究所 | Tunable light-frequency comb based on dual-mode square micro-cavity laser |
| WO2018206006A1 (en) * | 2017-05-12 | 2018-11-15 | 北京航空航天大学 | System and method for measuring time-frequency characteristic of high-frequency electromagnetic signal |
| CN108919588A (en) * | 2018-07-18 | 2018-11-30 | 上海理工大学 | Optical-fiber laser four-wave mixing driving generates broadband Tunable FIR light comb device |
| CN110212399A (en) * | 2019-06-10 | 2019-09-06 | 江苏师范大学 | A kind of broadband noise like laser and the production method of broadband noise like pulse |
| WO2020073766A1 (en) * | 2018-10-12 | 2020-04-16 | 华为技术有限公司 | Multi-wavelength laser |
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| WO2013127370A1 (en) * | 2012-03-02 | 2013-09-06 | 北京航空航天大学 | Method and system for measuring optical asynchronous sampled signal |
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| WO2020073766A1 (en) * | 2018-10-12 | 2020-04-16 | 华为技术有限公司 | Multi-wavelength laser |
| CN111796469A (en) * | 2019-04-09 | 2020-10-20 | 华为技术有限公司 | Optical frequency comb light source and method of generating an optical frequency comb |
| CN111796469B (en) * | 2019-04-09 | 2022-08-19 | 华为技术有限公司 | Optical frequency comb light source and method for generating optical frequency comb |
| US11914268B2 (en) | 2019-04-09 | 2024-02-27 | Huawei Technologies Co., Ltd. | Optical frequency comb light source and optical frequency comb generation method |
| CN110212399A (en) * | 2019-06-10 | 2019-09-06 | 江苏师范大学 | A kind of broadband noise like laser and the production method of broadband noise like pulse |
| CN110212399B (en) * | 2019-06-10 | 2021-09-17 | 江苏师范大学 | Broadband noise-like laser and method for generating broadband noise-like pulse |
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