CN202661760U - Novel wavelength conversion device - Google Patents
Novel wavelength conversion device Download PDFInfo
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- CN202661760U CN202661760U CN2012202852163U CN201220285216U CN202661760U CN 202661760 U CN202661760 U CN 202661760U CN 2012202852163 U CN2012202852163 U CN 2012202852163U CN 201220285216 U CN201220285216 U CN 201220285216U CN 202661760 U CN202661760 U CN 202661760U
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- photon crystal
- linear photon
- wavelength
- photonic crystal
- cavity mirror
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Abstract
The utility model discloses a novel wavelength conversion device which comprises a continuous light single frequency pump laser, an ultrashort pulse laser and a linear photonic crystal multi-wavelength conversion system. The linear photonic crystal multi-wavelength conversion system comprises a front linear photonic crystal waveguide, a front linear photonic crystal reflection cavity mirror, a linear photonic crystal resonance micro cavity, a back linear photonic crystal reflection cavity mirror and a back linear photonic crystal waveguide which are sequentially distributed on the linear photonic crystal. A first point defect is arranged at the center of the front linear photonic crystal reflection cavity mirror, and a second point defect is arranged at the center of the back linear photonic crystal reflection cavity mirror. The novel wavelength conversion device is not limited by non-linear optical materials, phase matching conditions or pump light power strength, and can achieve multi-wavelength conversion under any pump light power. Converted target wavelength can be freely manipulated by fine design of the defects of the photonic crystal resonance micro cavity and the reflection cavity mirror.
Description
Technical field
The utility model relates to wavelength conversion technology, particularly a kind of novel full light multi-wavelength conversion equipment.
Background technology
Wavelength conversion technology is the important means of obtaining new light sources, has very widely application prospect in fields such as optical fiber communication, single photon detection, high power capacity optical storage of data, biologic medical diagnosis.Since laser came out, wavelength conversion technology just was one of focus of optics circle research always, is subject to the great attention of national governments, scientist and business circles.
Wavelength conversion technology can be divided into light electro-optical type wavelength technology and All-Optical Wavelength Conversion Techniques.The former surveys and is converted to first electric signal to light signal, the recycling electric signal removes again to modulate the laser instrument of new wavelength, thereby realizes the wavelength conversion of signal.But this technology is owing to having introduced light-electrical-optical process, apparatus structure is complicated, very flexible, cost is high, power consumption is large, and the conversion of process light-electric light, and the information such as the phase place of original light signal, amplitude can be lost, can't realize the complete transparent transmission of light signal, rate-constrained is in electronic bottleneck (40Gb/s).And All-Optical Wavelength Conversion Techniques can directly be transformed into the input wavelength signal in the light territory on a certain new wavelength, and need not through the conversion of signal in light/electric territory, fast response time, compact conformation, thereby All Optical Wavelength Conversion is the development trend of current wavelength switch technology.
Current, most All Optical Wavelength Conversion all are based on nonlinear optical material, and by nonlinear optical technique (as with frequency, difference frequency, Raman frequency displacement, second harmonic, four-wave mixing effect) realize.Because the nonlinear factor of most of optical material is all lower, thus in order to produce considerable nonlinear effect, often need very high pumping light power density, this so that nonlinear optical material by body medium to optical fiber, and gradually to the micro/nano-scale future development.
Along with last century Mo photonic crystal and the in succession proposition of photonic crystal fiber concept, owing to its excellent performance enjoys attention.2003, the people such as T.Ishihara of Japan observed second harmonic generation (SHG) in the photonic crystal that is made of centro-symmetry dielectric, when pump intensity reaches 1MW/cm
2The time, SHG efficient is 10
-14After this, the domestic people such as stone Jianping realize SHG in the non-linear photon crystal fluctuation structure that the Si material consists of, under complete phase-matching condition, when pump intensity is 130MW/cm
2The time, SHG efficient reaches 0.2%.2007, people's experimental studies such as Wang Qiuguo based on the conversion of the wavelength of four-wave mixing effect in the dispersion flattene non-linear photon crystal optical fiber, obtained the wavelength conversion bandwidth of 28nm.2010, the people such as the B.Beaudou of Britain were filled with hydrogen in hollow non-linear photon crystal optical fiber, had observed the Raman frequency displacement under the pumping of low-power 1064nm laser instrument.In addition, Japan the people such as H.Fukuda from experiment confirm utilize the four-wave mixing process can Si-wire waveguide, realize the high speed full optical wavelength conversion.But along with the increase of pumping light power, Si-wire waveguide free-carrier Absorption effect is tending towards obviously gradually, and saturated phenomenon can appear in optical power density, thereby has influence on the further raising of conversion efficiency.
From above-mentioned report, these, need solve but still be faced with some basic difficult Kei although obtained remarkable progress based on the All-Optical Wavelength Conversion Techniques of nonlinear optical material.For example, realize that the wavelength conversion needs specific incident light frequency, sufficiently high pumping light power density, the strict position condition etc. that is complementary, and, can be used at present the nonlinear optical material that wavelength changes also more limited, this so that the wave band of All Optical Wavelength Conversion and range of application thereof be restricted.
The utility model content
For the above-mentioned shortcoming and deficiency that overcomes prior art, the purpose of this utility model is to provide a kind of full light multi-wavelength conversion equipment based on linear photon crystal, do not need by nonlinear optical effect, therefore be not subjected to the be complementary restriction of condition and pumping light power of nonlinear optical material, position.
The purpose of this utility model is achieved through the following technical solutions:
A kind of novel Wavelength converter, comprise continuous light single-frequency pump laser, ultrashort pulse laser, linear photon crystal multi-wavelength converting system, described linear photon crystal multi-wavelength converting system comprises by the front side linear photon crystal waveguide that is arranged in order at linear photon crystal, front side linear photon crystal reflecting cavity mirror, linear photon crystal resonant microcavity, rear side linear photon crystal reflecting cavity mirror, the waveguide of rear side linear photon crystal and forming; The central authorities of described front side linear photon crystal reflecting cavity mirror are provided with the first point defect; The central authorities of described rear side linear photon crystal reflecting cavity mirror are provided with the second point defective;
The linear photon crystal waveguide of described front side is used for the pump light of input continuous light single-frequency pump laser output;
The waveguide of described rear side linear photon crystal is used for the ultra-short pulse laser of input ultrashort pulse laser output, and is used for the resonant mode of output linearity photonic crystal resonant microcavity;
The wavelength of the Defect Modes of described the first point defect equates with the pumping light wavelength of continuous light single-frequency pump laser output; The wavelength of the Defect Modes of described second point defective equates with the resonant mode wavelength of the required output of linear photon crystal resonant microcavity.
Described linear photon crystal resonant microcavity is multimode cavity.
Described linear photon crystal resonant microcavity is square resonator cavity.
The distance at the center of described linear photon crystal resonant microcavity and the first point defect center is 5a, and the distance of the center of described linear photon crystal resonant microcavity and second point defect center is 5a; Wherein a is the grating constant of linear photon crystal.
The operation wavelength of described continuous light single-frequency pump laser is positioned at the linear photon crystal bandgap range.
Principle of the present utility model is as follows: after ultrashort laser pulse is injected from the waveguide of rear side linear photon crystal, because ultrashort pulse has wider frequency spectrum (its spectrum width and pulse time domain width are inversely proportional to), the Defect Modes of the point defect at rear side linear photon crystal reflecting cavity mirror center can be encouraged out, and that these Defect Modes wavelength are designed to is identical with some resonant mode wavelength in the linear photon crystal resonant microcavity, therefore these Defect Modes can be coupled in the linear photon crystal resonant microcavity efficiently.At this moment, the single-frequency continuous laser that is positioned at the linear photon crystal bandgap range with frequency again carries out pumping to the linear photon crystal resonant microcavity, thereby pump energy is transferred in many modes of resonance that already encourage continuously.In addition, front side linear photon crystal reflecting cavity mirror central authorities introduce point defect, its Defect Modes wavelength is equated with the pump light wavelength, but be different from chamber mould resonance wavelength, therefore thoroughly high to pump light, and it is high anti-to the light with resonant mode wavelength that motivates, thereby guarantee that these resonant modes that encourage out are reflected back the rear side of linear photon crystal resonant microcavity (being outgoing side) efficiently, and via the output (because the Defect Modes wavelength of this point defect and resonant mode wavelength that these encourage out are in full accord) that is coupled efficiently of the point defect at rear side linear photon crystal reflecting cavity mirror center, and the pumping continuous light is reflected back the linear photon crystal resonant microcavity efficiently by rear side linear photon crystal reflecting cavity mirror, and continue to transfer the energy in the mode of resonance that already encourages in the microcavity, thereby further improve the multi-wavelength conversion efficiency, realize efficient multi-wavelength frequency-selecting output.
Compared with prior art, the utlity model has following advantage and beneficial effect:
(1) the utility model need to be by nonlinear optical effect and technology, therefore be not subjected to the be complementary restriction of condition and pumping light power intensity of nonlinear optical material, position, can realize the wavelength conversion under the pumping light power arbitrarily.
(2) target wavelength of the utility model multi-wavelength conversion (being the resonance wavelength of each chamber mould in the linear photon crystal resonant microcavity) can freely be controlled by the Fine design to linear photon crystal resonant microcavity and reflecting cavity mirror point defect, thereby has higher dirigibility and degree of freedom than traditional wavelength conversion technology based on nonlinear optical material.
(3) the utility model utilizes the forbidden band reflection effect of mirror central point, chamber, microcavity front side defective, and the coupling effect between multimode cavity and mirror central point, microcavity rear side chamber defective, can realize efficient multi-wavelength frequency-selecting output.
(4) the utility model is based on the full light multi-wavelength conversion equipment of linear photon crystal, it is of a size of micron dimension, simple and compact for structure, and can use the semi-conducting material manufacturings such as silicon, be easy to other photonic devices integrated, (for example photonic computer, photon chip etc.) will have important using value in future full light Microsystems Design.
(5) the utility model not only can be realized full light multi-wavelength conversion, also can be used for laser frequency stabilization.
Description of drawings
Fig. 1 is the schematic diagram of the Wavelength converter of embodiment 1.
Fig. 2 is the schematic diagram of the Wavelength conversion system of embodiment 1.
Fig. 3 is the schematic diagram of the Wavelength conversion system of embodiment 2.
Embodiment
Below in conjunction with embodiment and accompanying drawing, the utility model is described in further detail, but embodiment of the present utility model is not limited to this.
Embodiment 1
As shown in Figure 1, the Wavelength converter of the present embodiment, comprise continuous light single-frequency pump laser (CWLD) 1, ultrashort pulse laser (Pulsed LD) 2, linear photon crystal multi-wavelength converting system (PCMWCS) 3, be provided with successively 50 * microcobjective 4,50 * microcobjective 5 along optical path direction between continuous light single-frequency pump laser 1 and the linear photon crystal multi-wavelength converting system 3; Be provided with successively 50 * microcobjective 6, semi-transparent semi-reflecting lens 8,50 * microcobjective 7 along optical path direction between linear photon crystal multi-wavelength converting system 3 and the ultrashort pulse laser 2.The operation wavelength of continuous light single-frequency pump laser 1 is λ=(1550 ± 1) nm, and the centre wavelength of ultrashort pulse laser 2 is λ=(1550 ± 2) nm, and pulsewidth is 200fs, and repetition frequency is 350MHz.
As shown in Figure 2, the linear photon crystal multi-wavelength converting system 3 of the present embodiment is made of the circular medium post of 25 * 9 Si material, arranges along the xy plane, and the refractive index of every medium post is n
0=3.4, (perpendicular to the xy plane) h=2 μ m highly, diameter d=0.4a, wherein a=635nm is grating constant, its forbidden band scope is 1502nm-2226nm.Linear photon crystal multi-wavelength converting system comprises by the front side linear photon crystal waveguide 9 that is arranged in order at linear photon crystal, front side linear photon crystal reflecting cavity mirror 12, linear photon crystal resonant microcavity 11, rear side linear photon crystal reflecting cavity mirror 13, rear side linear photon crystal waveguide 10 and forming; The central authorities of described front side linear photon crystal reflecting cavity mirror 12 are provided with the first point defect 14; The central authorities of described rear side linear photon crystal reflecting cavity mirror 13 are provided with second point defective 15.
The linear photon crystal resonant microcavity 11 of the present embodiment is square resonator cavity, is replaced original this locational circular medium post and is formed by the square medium post of 0.8a * 0.8a, and its refractive index still is n
0=3.4, two resonant mode wavelength of linear photon crystal resonant microcavity are respectively λ
01=1517nm and λ
02=1584nm.
Front side linear photon crystal reflecting cavity mirror 12, rear side linear photon crystal reflecting cavity mirror 13 lay respectively at the both sides, front and back of linear photon crystal resonant microcavity, and its grating constant and medium column parameter and former linear photon crystal structure are identical.It is that square medium post with 0.44a * 0.44a replaces the circular medium post on original relevant position to form that the central authorities of front side linear photon crystal reflecting cavity mirror 12 introduce the first point defect 14, the first point defects 14, and its refractive index still is n
0=3.4, its Defect Modes wavelength is 1550nm, and the distance at the center of the center of point defect 14 and linear photon crystal reflecting cavity mirror 13 is l
1=5a.Second point defective 15 is introduced at the center of rear side linear photon crystal reflecting cavity mirror 13, replaces original this locational circular medium post to form by the square medium post of 0.8a * 0.8a, and its refractive index still is n
0=3.4, two resonant mode wavelength of linear photon crystal resonant microcavity are respectively λ
01=1517nm and λ
02=1584nm; Second point defective 15 is identical with linear photon crystal resonant microcavity 13, therefore the resonant mode wavelength of its Defect Modes wavelength and linear photon crystal resonant microcavity 11 is identical, the distance at the center of the center of second point defective 15 and linear photon crystal reflecting cavity mirror 13 is l
2=5a.
Front side linear photon crystal waveguide 9 is positioned at the front side of front side linear photon crystal reflecting cavity mirror 12, is used for the pump light of input continuous light single-frequency pump laser output; The waveguide of rear side linear photon crystal is positioned at the rear side of rear side linear photon crystal reflecting cavity mirror 13, is used for the ultra-short pulse laser of input ultrashort pulse laser output, and is used for the resonant mode of output linearity photonic crystal resonant microcavity.
The present embodiment may further comprise the steps based on the full light multi-wavelength conversion method of linear photon crystal:
The S1 ultra-short pulse laser incides rear side linear photon crystal reflecting cavity mirror by the waveguide of rear side linear photon crystal, in rear side linear photon crystal reflecting cavity mirror, motivate the Defect Modes of second point defective, the Defect Modes of second point defective is coupled into the linear photon crystal resonant microcavity, forms resonant mode; The wavelength of the Defect Modes of described second point defective equates with the wavelength of the resonant mode of the required output of linear photon crystal resonant microcavity, and concrete steps are:
S11 utilizes all property photonic crystal medium post directions (being transverse magnetic wave, the TM polarization) along the line of electric field polarization that polaroid makes continuous light pump laser 1 and ultrashort pulse laser 2;
S12 opens ultrashort pulse laser 2, pulse laser beam is after the reflection of microcobjective 6 collimations and semi-transparent semi-reflecting lens 8, after microcobjective 5 focuses on, inject again the rear side linear photon crystal waveguide 10 of linear photon crystal multi-wavelength converting system 3 along 2 dimensional linear photonic crystal planes (being the xy face), and (its wavelength is respectively λ with two Defect Modes of the second point defective 15 of rear side linear photon crystal reflecting cavity mirror central authorities
01=1517nm and λ
02=1584nm) encourage out; Because the Defect Modes wavelength of second point defective 15 and the resonant mode wavelength of linear photon crystal resonant microcavity 11 are identical, therefore two Defect Modes that are energized out in the second point defective 15 can be coupled in the linear photon crystal resonant microcavity 11 efficiently.
The S2 frequency is positioned at the in the past side line photon crystal wave-guide incident of single-frequency continuous laser of linear photon crystal bandgap range, after seeing through front side linear photon crystal reflecting cavity mirror the linear photon crystal resonant microcavity is carried out pumping, pump energy is transferred in the resonant mode, and by rear side linear photon crystal waveguide export resonance mould; The wavelength of the Defect Modes of the first point defect in the wavelength of described single-frequency continuous laser and the front side linear photon crystal reflecting cavity mirror equates, is specially:
Open single-frequency continuous light pump laser 1, laser beam is through microcobjective 4, the collimation of microcobjective 5, inject the front side waveguide 9 of injecting linear photon crystal optical frequency converting system 3 along 2 dimensional linear photonic crystal planes (being the xy face) after the gathering, because the Defect Modes wavelength of the first point defect 14 of front side linear photon crystal reflecting cavity mirror 12 central authorities is 1550nm, just identical with the operation wavelength of continuous light pump laser, therefore the pumping continuous light can efficiently see through reflecting cavity mirror 12 (100%), enter and carry out pumping in the linear photon crystal resonant microcavity 11, thereby make pump energy transfer to continuously the mode of resonance λ that already encourages in the linear photon crystal resonant microcavity
01And λ
02In.Simultaneously, because λ
01And λ
02Different from the Defect Modes wavelength of the first point defect 14, front side linear photon crystal reflecting cavity mirror 12 will have a resonant mode wavelength X to what motivate in the linear photon crystal resonant microcavity 11
01And λ
02Light high anti-, thereby guarantee that these resonant modes that encourage out are reflected back linear photon crystal resonant microcavity 11 rear sides (being outgoing side) efficiently, and via the output (because the Defect Modes wavelength of point defect 15 and resonant mode wavelength that these encourage out are in full accord) that is coupled efficiently of the second point defective 15 of the central authorities of the linear photon crystal reflecting cavity mirror 13 of linear photon crystal resonant microcavity 11 rear sides, and the pumping continuous light is reflected back linear photon crystal resonant microcavity 11(because the continuous light wavelength of pumping is different from the Defect Modes wavelength of second point defective 15 efficiently by rear side linear photon crystal reflecting cavity mirror 13), and continue to transfer the energy in the mode of resonance that already encourages in the linear photon crystal resonant microcavity 11, thereby further improve the multi-wavelength conversion efficiency.Like this, just, can realize efficient multi-wavelength (λ
01And λ
02) simultaneously output.
Embodiment 2
As shown in Figure 3, the present embodiment is except following characteristics, and all the other features are all same with embodiment 1.
The point defect 16 of the rear side linear photon crystal reflecting cavity mirror of linear photon crystal multi-wavelength converting system replaces original this locational circular medium post to form by the square medium post of 0.42a * 0.42a or 0.46a * 0.46a.
The present embodiment has been realized multi-wavelength is carried out frequency-selecting output and since this moment point defect the length of side to be reduced into 0.42a * corresponding Defect Modes wavelength of 0.42a(by 0.8a * 0.8a be λ
01) or 0.46a * corresponding Defect Modes wavelength of 0.46a(be λ
02), so that the multimode (λ of point defect mould
01And λ
02) single mode (λ that becomes
01Or λ
02).When ultra-short pulse laser during from waveguide incident, the individual defect mould in the point defect 16 can only be encouraged out (is λ
01Or λ
02), and be coupled into efficiently in the linear photon crystal resonant microcavity.(wavelength is 1550nm) finally realizes multi-wavelength frequency-selecting (λ under the pumping of single-frequency continuous light
01Or λ
02) output.
Above-described embodiment is the better embodiment of the utility model, but embodiment of the present utility model is not limited by the examples, as, the linear photon crystal resonant microcavity can also be circular resonant chamber, rectangular cavity and oval resonator cavity etc.; Other any do not deviate from change, the modification done under Spirit Essence of the present utility model and the principle, substitutes, combination, simplify, and all should be the substitute mode of equivalence, is included within the protection domain of the present utility model.
Claims (5)
1. novel Wavelength converter, it is characterized in that, comprise continuous light single-frequency pump laser, ultrashort pulse laser, linear photon crystal multi-wavelength converting system, described linear photon crystal multi-wavelength converting system comprises by the front side linear photon crystal waveguide that is arranged in order at linear photon crystal, front side linear photon crystal reflecting cavity mirror, linear photon crystal resonant microcavity, rear side linear photon crystal reflecting cavity mirror, the waveguide of rear side linear photon crystal and forming; The central authorities of described front side linear photon crystal reflecting cavity mirror are provided with the first point defect; The central authorities of described rear side linear photon crystal reflecting cavity mirror are provided with the second point defective;
The wavelength of the Defect Modes of described the first point defect equates with the pumping light wavelength of continuous light single-frequency pump laser output; The wavelength of the Defect Modes of described second point defective equates with the resonant mode wavelength of the required output of linear photon crystal resonant microcavity.
2. novel Wavelength converter according to claim 1 is characterized in that, described linear photon crystal resonant microcavity is multimode cavity.
3. the novel Wavelength converter of stating according to claim 1 and 2 is characterized in that, described linear photon crystal resonant microcavity is square resonator cavity.
4. the novel Wavelength converter of stating according to claim 1, it is characterized in that, the distance at the center of described linear photon crystal resonant microcavity and the first point defect center is 5a, and the distance of the center of described linear photon crystal resonant microcavity and second point defect center is 5a; Wherein a is the grating constant of linear photon crystal.
5. novel Wavelength converter according to claim 1 is characterized in that, the operation wavelength of described continuous light single-frequency pump laser is positioned at the linear photon crystal bandgap range.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2012202852163U CN202661760U (en) | 2012-06-15 | 2012-06-15 | Novel wavelength conversion device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012202852163U CN202661760U (en) | 2012-06-15 | 2012-06-15 | Novel wavelength conversion device |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102722061A (en) * | 2012-06-15 | 2012-10-10 | 华南理工大学 | All-optical multi-wavelength conversing method and device based on photonic crystal |
| CN112995804A (en) * | 2020-12-29 | 2021-06-18 | 北京理工大学 | Optical switching method, device and system |
-
2012
- 2012-06-15 CN CN2012202852163U patent/CN202661760U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102722061A (en) * | 2012-06-15 | 2012-10-10 | 华南理工大学 | All-optical multi-wavelength conversing method and device based on photonic crystal |
| CN112995804A (en) * | 2020-12-29 | 2021-06-18 | 北京理工大学 | Optical switching method, device and system |
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| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130109 Termination date: 20150615 |
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| EXPY | Termination of patent right or utility model |