CN102520559A - Method for generating arbitrary waveforms on basis of optical injection locking - Google Patents
Method for generating arbitrary waveforms on basis of optical injection locking Download PDFInfo
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- CN102520559A CN102520559A CN2011104288245A CN201110428824A CN102520559A CN 102520559 A CN102520559 A CN 102520559A CN 2011104288245 A CN2011104288245 A CN 2011104288245A CN 201110428824 A CN201110428824 A CN 201110428824A CN 102520559 A CN102520559 A CN 102520559A
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Abstract
The invention provides a new method for generating arbitrary waveforms on the basis of optical injection locking, which adopts the optical injection locking technology to keep multiple channels of optical signals stable relatively so as to generate arbitrary waveforms according to different harmonic components which are composed of difference frequencies of the optical signals. A wide-band light source is injected into multiple distributed feedback semiconductor lasers through an optical isolator and a series of beam splitter prisms sequentially, and mode locking is realized after working temperature and current of each laser are regulated. Phase and amplitude of output optical signals of the lasers are changed respectively by regulating the spatial positions of the lasers and dimmable power attenuators in output optical paths. Different channels of difference-frequency signals with adjusted phase and amplitude are coupled through the optical paths, so that arbitrary waveforms are generated finally. The method can be used for generation of arbitrary waveforms in the frequency ranging from several Ghz to dozens of Ghz, and can be applied to multiple fields of manufacturing of ultrahigh signal generation equipment, testing of communicating systems, radar communication and the like widely.
Description
Technical field:
The invention belongs to the microwave signal source technical field, relate to a kind of method of the generation random waveform based on optics injection locking.
Background technology:
Waveform generator is to use a lot of a kind of signal generation apparatus and signal source in circuit design, debugging and in measuring.General signal source only can produce the waveform of several kinds of solid shapes; And any waveform that it is contemplated that can created and produce to AWG (Arbitrary Waveform Generator), it is guiding, ease for use and dirigibility are convenient for people to greatly design and debugging.AWG can produce various waveforms for simulated field signal and various signal are synthetic.
Along with deepening continuously and the field expansion of science and technology research, the signal that requirement is used to simulate is complicated, various more.For example, each step development of communication all requires different test signals.The raising of automobile function and reliability also is accompanied by more, the more complicated signals of use.Numerous areas such as material science, life science all requires to produce complicated signal with AWG.
AWG is a kind of special signal source, and at present the main implementation method that takes place of signal has two kinds of direct modeling method and Direct Digital methods.
One, direct modeling method
Tradition function generator structure is as shown in Figure 1, generally all is to produce original waveform by the free oscillation device, converts original waveform to other waveform through change-over circuit then.Triangular wave is produced by oscillator, and square wave is that triangular wave forms through comparator transition, and sine wave is that triangular wave passes through a waveform shaping circuit (sine wave shaper) and develops; Needed waveform is through amplifying and decay output; Obvious this mode simple in structure implements than is easier to, and is mainly used in the generation that frequency is the waveform of tens MHz; But the waveform catalog of its generation is limited; A kind of waveform of every increase all will increase corresponding change-over circuit, and it is very complicated that entire circuit becomes.
Two, Direct Digital method
The Direct Digital method is to adopt the method for the synthetic DDS (direct digital synthesis) of Direct Digital to realize that signal produces.Based on the basic structure and the principle of DDS AWG, as shown in Figure 2: every through a clock period, phase accumulator (PAR) all increases a new phase place in total phase place.All phase places among the current PAR all are used to visit the reference waveform storer.The capacity of PAR is generally much bigger than the capacity of wave memorizer.The actual of its wave memorizer but is to be rounded up to or to block and visit the result in the next address with reference to output.Increased after the continuous phase of some, PAR will overflow, and whenever overflows an excess phase and has different values, and this just makes the address of output waveform in the reference waveform storer, constantly push ahead.Although a certain single circulation is just accurately approximate, average output frequency can reach very high resolution.Therefore; The advantage of this mode is its very high frequency resolution and exports transfer capability fast; But its phase jitter is many than in traditional AWG of the phase jitter under the high frequency output state especially; So, generally be inappropriate for based on the AWG of DDS and be used for producing high speed arbitrary waveform.
Can find out that through top introduction the method for designing of existing AWG respectively has relative merits, generally can only reach tens MHz but the defective that all exists is the highest frequency that produces signal.
Summary of the invention:
The present invention seeks to solve the low problem that generally can only reach tens MHz of highest frequency that existing AWG produces signal; A kind of AWG based on optics injection locking is proposed; Method through optics injection locking; Be injected into broadband pectination spectrum signal in each Distributed Feedback Laser, phase place, frequency, the amplitude stabilization of the difference frequency signal of the light signal generating that the Distributed Feedback Laser of process mode locking produces, and can be adjusted respectively through simple method; Carry out the synthetic of each harmonic then, the waveform that so just can obtain wanting.
The method of the generation random waveform based on optics injection locking provided by the invention, the generator that utilizes this method to constitute mainly comprise wide spectrum light source, the optoisolator of injection locking and the distributed feedback type semiconductor laser array that is made up of a component cloth feedback type semiconductor laser (DFB-LD), depolarization Amici prism and adjustable light power attenuator; The first, the wide spectrum light source of injection locking is through behind the optoisolator, through being injected in one group of laser instrument after the beam splitting of one group of depolarization Amici prism.The second, regulate the working temperature and the electric current of each laser instrument, make its light-emitting mode wavelength and want that the spectral line that locks carries out mode locking in lock-in range.The 3rd, the laser instrument after the locking is through the locus of regulating laser instrument and phase place and the amplitude that the adjustable light power attenuator in the output light path changes signal respectively.At last, each road signal of having adjusted phase place and amplitude carries out the light path coupling through the depolarization Amici prism and obtains difference frequency signal, promptly is the each harmonic component, so just can realize the generation of random waveform.
Described distributed feedback type semiconductor laser array comprises 2
nIndividual distributed feedback type semiconductor laser, 2
N+1-1 depolarization Amici prism and 2
nIndividual adjustable light power attenuator, n>=1, in case the value of given n, then above-mentioned device number is confirmed; Wide spectrum light source passes through optoisolator through 2
N+1Inject each laser instrument after the beam splitting in 1: 1 of-1 depolarization Amici prism, n+1 depolarization Amici prism arranged between each laser instrument and the wide spectrum light source, the light signal of each laser instrument output carries out the light path coupling with the depolarization Amici prism and gathers back output.The depolarization Amici prism when injection laser and laser instrument output the time be respectively beam splitting and the effect of closing bundle, the Amici prism quantity through overcoupling during each laser instrument output can be different perhaps identical.The described wide spectrum light source that is used for injection locking can be that directly modulated lasers, the mode-locked laser modulated through microwave signal also can be other frequency comb light sources with wide range characteristic.
Described depolarization Amici prism can be polarization branch, bundling device, also can be any have light path is carried out beam splitting and the device that closes bundle and do not influence the function of polarization state of light replaces.
Said adjustable light power attenuator can be the gradual change neutral density filter, also can be the device that can regulate spatial beam power arbitrarily.
Said design can be the system that is made up by discrete component fully, also can part of devices be made up of the optical integrated chip based on waveguiding structure, and wherein depolarization Amici prism, laser instrument are can monolithic integrated.
The broadband pectination spectrum signal that the present invention is used for injection locking is the beam splitting of carrying out light through the depolarization Amici prism, and the signal of Distributed Feedback Laser output also carries out the bundle that closes of light through the depolarization Amici prism.With adopting ordinary optic fibre beam splitting, bundling device to compare, the elimination that space optical path is big as far as possible the influence of polarization state.
The depolarization Amici prism of bundle is closed in the beam splitting that is used for light is not almost had influence to phase place, the polarization state of light signal, and reflection, transmitted optical power ratio are 1: 1, guarantees that the signal power that is injected in each Distributed Feedback Laser is almost equal, is convenient to system initialization and debugging.
The signal waveform that Distributed Feedback Laser after the locking sends, the relative displacement that can pass through adjusting laser instrument and system's output terminal changes the phase place of signal waveform, can change the amplitude of signal waveform through the adjustable light power attenuator of regulating laser instrument output place.
The only phase place of said each blocked Distributed Feedback Laser output, the light signal of amplitude stabilization.
The number of said blocked Distributed Feedback Laser is many more, and the difference frequency signal that obtains is just many more, and promptly harmonic component is just many more, and the signal waveform quality that produces at last is also high more, and is just high more with the degree of fitting of the waveform of wanting to produce.
The wavelength tuning of said Distributed Feedback Laser can be realized through regulating temperature, also can realize through regulating electric current.
Said active device only comprises laser instrument, microwave source, and other is passive device, so this system has high stability, almost Maintenance free.
Advantage of the present invention and beneficial effect:
The present invention utilizes the optics injection locking technique to design a kind of method that produces random waveform; This design system has simple in structure; Degree of stability is high, and expansibility is strong, the signal complexity advantages of higher of generation; Compare with existing design of Random Waveform Generator method, have following some advantage: it is high one, to produce the signal waveform frequency.The Distributed Feedback Laser operation wavelength that is injected into locking among the design is all near 1550nm, and the difference frequency of the light wave that each road laser instrument sends is as the harmonic wave of composite wave, and the signal waveform frequency after therefore synthetic can reach several GHz even tens GHz.Two, produce signal waveform and purpose waveform fitting degree height.Can increase the number of Distributed Feedback Laser among the design, thereby increase the number of participating in synthetic harmonic wave, the details of waveform is also just good more, and then improves last signal waveform and the purpose waveform fitting degree that produces.Three, produce signal waveform degree of stability height.All light paths after pectination spectrum signal in broadband produces among the design are all transmitted in the space, the beam splitting of all light paths, close Shu Jun and realize through the depolarization Amici prism, have overcome the degree of stability influence of polarization state of light to signal waveform.And, through the method for injection locking, the optical signal line width that each Distributed Feedback Laser sends, phase place, amplitude stabilization.Thereby guaranteed that each difference frequency signal waveform that obtains has very high degree of stability.Based on above-mentioned advantage, the present invention can be widely used in ultrahigh frequency arbitrary signal generation device fabrication, the test of communication system, radar communication, numerous areas such as material science, life science.
Description of drawings:
Fig. 1 is traditional function generator structure.
Fig. 2 is the structure based on the AWG of DDS.
Fig. 3 is the AWG synoptic diagram based on optics injection locking.
Fig. 4 is the AWG structural drawing based on optics injection locking.(a) for the laser instrument number being 8 structure, (b) is 4 structure for the laser instrument number.
Among the figure, 1DFB laser instrument, 2 adjustable light power attenuators, 3 depolarization Amici prisms, 4 microwave sources, 5 directly modulated lasers, 6 optoisolators.
Below will combine embodiment to describe the present invention.The invention is not restricted to this embodiment.
Embodiment:
Embodiment 1, (the Distributed Feedback Laser number is 8, n=3)
Be depicted as the composition frame chart of a kind of AWG of this method like (a) among Fig. 4, comprising directly modulated lasers, microwave source, optoisolator, 22 depolarization Amici prisms (comprising preflood 15 with the output coupling 7), 8 distributed feedback semiconductor lasers (DFB-LD), 8 adjustable light power attenuators.
Directly modulated lasers forms the signal of the pectination spectrum with broadband through microwave source modulation back; The bandwidth that can be used for injection locking in the present embodiment is made as 400GHz between the 500GHz; This signal is injected in 8 Distributed Feedback Lasers through 15 depolarization Amici prisms through behind the optoisolator again; 4 depolarization Amici prisms are all arranged between each laser instrument and the directly modulated lasers; The effect of optoisolator is to prevent that the light that Distributed Feedback Laser sends from turning back in the directly modulated lasers; The effect that the depolarization Amici prism that uses among the design only plays the beam splitting of light and closes bundle light path; Be that transmitted light and reflected optical power ratio are 1: 1 under the situation of beam splitting, guaranteed that like this power that is injected into each Distributed Feedback Laser from the injection signal that directly modulated lasers sends almost is 1/16 of injection signal power, regulates the working temperature and the electric current of each Distributed Feedback Laser then; Make its light-emitting mode wavelength and want that the spectral line that locks carries out mode locking in lock-in range; The spectral line of two adjacent laser instruments differs about 50GHz among the design, and corresponding its operation wavelength differs about 4nm, can produce each harmonic components such as 50GHz, 100GHz, 150GHz after the light signal process light path coupling that each laser instrument sends like this.
Suppose that wherein the light wavelength that two Distributed Feedback Lasers send is respectively λ
1, λ
2, corresponding frequency is respectively f
1, f
2, the Electric Field Distribution expression formula of establishing two light waves is:
E
1, E
2Be respectively the amplitude of two light waves, f
1, f
2Be respectively the frequency of two light waves,
Be respectively the initial phase of two light waves.The field intensity of closing of two light waves is:
E(t)＝E
1(t)+E
2(t)
Luminous power Theoretical Calculation in the photodetector response is following:
In conjunction with the physical process analysis of photodetector, f
1, f
2All be the higher light signal of frequency, preceding two in the formula is the spectral response item, and they represent two DC components.Next two have the different of essence with two of fronts, back two be luminous power the time become response, relevant with the frequency response of detector, be spectral response no longer.But (f
1+ f
2) frequency too high, and do not exist in physically high like this frequency, photodetector does not respond.That is to say that this part light wave composition and detector do not interact, in fact do not have this.Difference frequency term (f
1-f
2) with respect to (f
1+ f
2) be a power component that slowly changes, as long as difference frequency term (f
1-f
2) frequency less than photodetector by response frequency, corresponding photocurrent output is just arranged on the photodetector.Consider that in conjunction with mathematical operation and above-mentioned physical process the output of photodetector has only difference frequency term (f
1-f
2).
So the light that per two laser instruments send all can produce a difference frequency signal, because the difference on the frequency of two adjacent laser instruments is 50GHz; Be designated as F, then these 8 laser instruments can produce frequency and be respectively F, 2F; 3F, 4F, 5F; 6F, the signal of 7F is the each harmonic component of these difference frequency signals as composite wave.
The cycle of supposing the signal f (t) that we want to produce is T, and angular frequency can be decomposed into according to Fourier series for
:
This shows that periodic signal can be decomposed into the each harmonic component; Conversely; We can come match f (t) through limited harmonic wave; Locus through adjusting each laser instrument and adjustable light power attenuator change the phase place and the amplitude of the light signal that each laser instrument sends, and then change the phase place and the amplitude of each harmonic, so just can realize the generation of random waveform.
Embodiment 2, (the Distributed Feedback Laser number is 4, n=2)
Be depicted as the composition frame chart of the another kind of AWG of this method like (b) among Fig. 4, comprising directly modulated lasers, microwave source, optoisolator, 10 depolarization Amici prisms (comprising preflood 7 with the output coupling 3), 4 distributed feedback semiconductor lasers (DFB-LD), 4 adjustable light power attenuators.
It is preferred embodiment of the present invention that foregoing only provides.Those skilled in the art can be easy to expect according to text description provided by the present invention, accompanying drawing and claims; Under the condition of design of the present invention that does not break away from claims and limited and scope, can make multiple variation and change.Every foundation technical spirit of the present invention is done any simple modification, equivalent variations and modification to the foregoing description, in the protection domain that all belongs to claim of the present invention and limited.
Claims (5)
1. based on the method for the generation random waveform of optics injection locking, it is characterized in that: the generator that utilizes this method to constitute mainly comprises wide spectrum light source, the optoisolator of injection locking and the distributed feedback type semiconductor laser array that is made up of a component cloth feedback type semiconductor laser (DFB-LD), depolarization Amici prism and adjustable light power attenuator;
The first, the wide spectrum light source of injection locking is through behind the optoisolator, through being injected into after the beam splitting of one group of depolarization Amici prism in one group of laser instrument;
The second, regulate the working temperature and the electric current of each laser instrument, make its light-emitting mode wavelength and want that the spectral line that locks carries out mode locking in lock-in range;
The 3rd, the laser instrument after the locking is through the locus of regulating laser instrument and phase place and the amplitude that the adjustable light power attenuator in the output light path changes signal respectively;
At last, each road signal of having adjusted phase place and amplitude carries out the light path coupling through the depolarization Amici prism and obtains difference frequency signal, promptly is the each harmonic component, so just can realize the generation of random waveform;
Described distributed feedback type semiconductor laser array comprises 2
nIndividual distributed feedback type semiconductor laser, 2
N+1-1 depolarization Amici prism and 2
nIndividual adjustable light power attenuator, n>=1, in case the value of given n, then above-mentioned device number is confirmed; Wide spectrum light source passes through optoisolator through 2
N+1Inject each laser instrument after the beam splitting in 1: 1 of-1 depolarization Amici prism, n+1 depolarization Amici prism arranged between each laser instrument and the wide spectrum light source, the light signal of each laser instrument output carries out the light path coupling with the depolarization Amici prism and gathers back output; The depolarization Amici prism when injection laser and laser instrument output the time be respectively beam splitting and the effect of closing bundle, the Amici prism quantity through overcoupling during each laser instrument output can be different perhaps identical.
2. method according to claim 1 is characterized in that, the described wide spectrum light source that is used for injection locking can be that directly modulated lasers, the mode-locked laser modulated through microwave signal also can be other frequency comb light sources with wide range characteristic.
3. method according to claim 1 is characterized in that, described depolarization Amici prism can be polarization branch, bundling device, also can be any have light path is carried out beam splitting and the device that closes bundle and do not influence the function of polarization state of light replaces.
4. the method for claim 1 is characterized in that, said adjustable light power attenuator can be the gradual change neutral density filter, also can be the device that can regulate spatial beam power arbitrarily.
5. the method for claim 1 is characterized in that, said design can be the system that is made up by discrete component fully, also can part of devices be made up of the optical integrated chip based on waveguiding structure, and wherein depolarization Amici prism, laser instrument are can monolithic integrated.
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| CN104270096A (en) * | 2014-09-05 | 2015-01-07 | 贵州大学 | All-optical arbitrary waveform generator |
| CN107247381A (en) * | 2017-07-11 | 2017-10-13 | 中国科学院半导体研究所 | A kind of integrated arbitrary waveform signal generator of silicon substrate |
| CN113612109A (en) * | 2021-07-30 | 2021-11-05 | 华中科技大学 | Semiconductor laser device for realizing electro-optical latching function and information loading/latching method |
| CN114142940A (en) * | 2021-12-13 | 2022-03-04 | 上海交通大学 | Distributed optical millimeter wave/terahertz transmission system and transmission method |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104270096A (en) * | 2014-09-05 | 2015-01-07 | 贵州大学 | All-optical arbitrary waveform generator |
| CN107247381A (en) * | 2017-07-11 | 2017-10-13 | 中国科学院半导体研究所 | A kind of integrated arbitrary waveform signal generator of silicon substrate |
| CN107247381B (en) * | 2017-07-11 | 2019-09-24 | 中国科学院半导体研究所 | A kind of integrated arbitrary waveform signal generator of silicon substrate |
| CN113612109A (en) * | 2021-07-30 | 2021-11-05 | 华中科技大学 | Semiconductor laser device for realizing electro-optical latching function and information loading/latching method |
| CN114142940A (en) * | 2021-12-13 | 2022-03-04 | 上海交通大学 | Distributed optical millimeter wave/terahertz transmission system and transmission method |
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