CN102722000A - Method for implementing microwave photonic filter based on photonic crystal - Google Patents
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Abstract
The invention relates to a method for implementing a microwave photonic filter based on a photonic crystal. A bent waveguide integrated coupling beam splitter and a slow light waveguide delay line are used on the same photonic crystal, so that a system function of the filter has the bandpass filter characteristic of trapped wave depth of 10dB in a free frequency spectral range of 130 GHz at 1,550 nanometers; and the function of filtering residual edge bands of a light generation millimeter wave signal can be realized. By using a bidimensional photonic crystal structure compared with an optical fiber ring structure, the size of the filter can be greatly reduced; and the method is favorable for minimizing and integrating the device.
Description
Technical field
The present invention relates to a kind of microwave photon filter implementation method, belong to the optical filter technical field based on photonic crystal.
Background technology
The most of communication service of China at present all concentrates on below the 3GHz; And existing low frequency band frequency resource is nearly all occupied; But for the less utilization of the frequency resource more than the 3GHz, particularly for the high loss window of two propagation in atmosphere of 24GHz and 60GHz frequency range.Exempt from licensed band in order to make full use of 60GHz, the RoF technology is arisen at the historic moment, and this technology fully combines the characteristics of optical fiber and high frequency radio wave transmission, and radiofrequency signal wire transmission cheaply and super wideband wireless insert.
Generally speaking, the RoF system utilizes radio-frequency oscillator to be converted to radio frequency band to baseband signal, and driven modulator is loaded into radiofrequency signal and produces the photoproduction millimeter-wave signal on the light carrier then, and light signal is transferred to the base station through single-mode fiber afterwards.In the generation and transmission course of photoproduction millimeter wave; Signal dispersion and Insertion Loss all can be introduced noise on the one hand; The transmission length and the transmission quality of undesired signal, the double-side band transmission is prone to cause peak-to-peak interference on the other hand, so the RoF system need use wave filter to come filtering noise and unnecessary sideband.Yet traditional microwave filter is because the existence of electronic bottleneck almost can't be handled the above microwave signal of 10GHz, thereby the technology of utilizing the photon method to handle high-frequency microwave has received more and more researcher's concern both at home and abroad.Microwave photon filter (MPF) has low-loss, high bandwidth, anti-electromagnetic interference (EMI), is easy to realize tunable and is easy to characteristics such as reconstruct, can significantly improve communication quality.Compare with conventional filter, microwave photon filter can be transferred to the light territory to the filtering of electric territory, thereby makes the RoF system overcome electronic bottleneck.
Whether limited according to number of taps; Microwave photon filter mainly contains based on the wave filter of finite impulse response system (FIR) (document 1; Capmany J; Ortega B, Pastor D. " A Tutorial of microwave photonic filters " .Journal of Lightwave Technology, 2006; Document 2, Chaneh.W, Minasian.R.A. " Optical source coherence controller for fiber optic delay line RF/microwave signal processors " .Optics Communications, 2005; Document 3; Yu Yan and Jianping Yao. " A tunable photonic microwave filter with a complex coefficient using an optical RF phase shifer " .Photonics Technology Letters; 2007); With wave filter (document 4, Qiaofan Xu, David Fattal based on infinite impulse response system (IIR); And Raymond G.Beansoleil. " Silicon microring resonators with 1.5 μ m radius " .Optics Express, 2011; Document 5, Zhu Wang, Kin Seng Chiang, and Qing Liu. " Microwave photonic filter based on circulating a cladding mode in a fiber ring resonator " .Optics Letters, 2010).Wherein, iir filter is with its features simple structure, and lower-price characteristic is paid close attention to deeply.Iir filter generally is made up of two parts: coupling beam splitting unit and annular delay cell.Coupling beam splitting unit can provide beam splitting and coupling function, and the light of input filter is partly introduced delay cell, after through the delay of delay cell additional cycle property, is coupled into coupling unit again, gets into next round beam splitting-delay-coupling cycle.This in theory circulation is unlimited, therefore is called unlimited response filter.Except simple fiber optic loop, iir filter can be divided into Sarnia gram ring wave filter (document 6, Xudong Wang according to the material of delay cell; Erwin H.W.Chan, and Robert A.Minasian. " Microwave photonic notch filter based on a dual-Sagnac-loop structure " .Applied Optics, 2010); Silicon ring wave filter (document 7, Magdalena S.Nawrocka, Tao Liu; Xuan Wang, and Roberto R.Panepucci. " Tunable silicon microring resonator with wide free spectral range " .Applied Physics Letters, 2006); Mach zhender interference filter (document 8; Jos é Mora, Beatriz Ortega, Antonio D í ez; Jos é Luis Cruz; Miguel V.Andr é s, Jos é Capmany, and Daniel Pastor; Journal of Lightwave Technology; 2006) with based on microwave photon filter (document 9, Weiqi Xue, the Salvador Sales of SOA; Jesper
and Jos é Capmany. " Widely Tunable Microwave Photonic Notch Filter Based on Slow and Fast Light Effects " .Photonics Technology Letters, 2009).These wave filters respectively have its advantage, perhaps can form single bandwidth frequency response (document 8) like restructural (document 7), relevant chromatic dispersion low (document 9), but all have same shortcoming, and promptly delay cell is larger, is unfavorable for device miniatureization and integrated.Its reason just is that delay cell material group index is on the low side.Free spectral range (Free Spectral Range, computing formula FSR) is following: FSR=c/nL, wherein c is a light speed in a vacuum, and n is the group index of delay cell, and L is the length of delay cell.According to formula, confirm that the length of delay cell will be inversely proportional to group index in case meet the FSR of RoF system requirements, therefore use the high group refraction materials to become the effective means that reduces delay cell length.As a kind of material that has the slower rays characteristic, being introduced as of photonic crystal reduces filter size provides new scheme.
Because photonic crystal has that volume is little, locality well and the characteristics such as power transfer of can realize turning round greatly low-loss even zero loss; Thereby have huge advantage and potentiality at OEIC and PIC application; And had research group obtaining great achievement aspect the photonic crystal slower rays both at home and abroad: people such as Yun Shen had realized that group index was at (the document 10 of the coupler waveguide slower rays device more than 100 in 2009; Yun Shen; Guoping Wang.Multiple slow light bands in photonic crystal coupled resonator optical waveguides constructed with a portion of photonic quasicrystals.Physics LettersA; 2009), 2010, people such as Fang Long were with photonic crystal line waveguide slower rays device application (document 11 in buffer unit; Fang Long; Huiping Tian, and Yuefeng Ji.Buffering capability and limitations in low dispersion photonic crystal waveguides with elliptical airholes.Optics, 2010).Wherein photon crystal wave-guide slower rays structural design is flexible, can confirm different group indexs through the adjustment structural parameters, makes required precision simultaneously than low many of high Q value coupler, is the comparatively ideal scheme of making delay cell.
The present invention uses photonic crystal to make microwave photon filter first, is specially and utilizes curved waveguide that four port coupling beam dividers and slow optical wave guide lag line are integrated in the same substrate.1550nm arrowband TE polarized light is injected coupling mechanism; Because the coupled modes effect (document 12 of photonic crystal; CHIENFSS, HSU Y J.Dual wavelength demultiplexing by coupling and decoupling of photonic crystal waveguides.Optics Express, 2004); A part is directly from outlet output after the beam splitting of TE light process coupling unit; Another part then gets into down going channel, and through curved waveguide input delay unit, through re-entering coupling unit after the slow optical wave guide delay in the delay cell.The characteristic that so has trap (band resistance) wave filter through the system spectrum response that forms after infinite the circulation.
Summary of the invention
The objective of the invention is to utilize the slower rays and the waveguide-coupled characteristic of photonic crystal, the size of microwave photon filter is significantly reduced, more be applicable to the microminiaturized trend in base station of present RoF system.
The present invention utilizes two 180 ° U type curved waveguides to be integrated on the same flat board photon crystal coupled beam splitter and slow optical wave guide first; Proposed a kind of implementation method of utilizing photonic crystal to make microwave photon filter, this wave filter can obtain through the technological segmentation etching of focused particle beam (FIB) on semiconductor material substrate.1550nm wave band arrowband TE polarized light will get into coupling beam splitting W1 (removing perfect photonic crystal one emptying pore) waveguide from the entrance port; After the waveguide beam splitting; Part light output filter, another part then is coupled into another W1 waveguide arranged side by side with the incident waveguide.This part TE light gets into the delay cell that slow optical wave guide forms along curved waveguide, and through the slower rays effect of slow optical wave guide, the group velocity of TE light slows down, thereby can in shorter light path, realize bigger time delay.
The microwave photon filter of making in the present invention is made up of coupling beam divider and slow optical wave guide two parts, is connected by two 180 ° U type curved waveguides between the two.Wherein, two parallel W1 waveguides constitute four port coupling beam dividers, and interval one emptying pore carries out emulation through simulation software to its energy band diagram and transmission spectrum between the waveguide, obtains the coupling coefficient of coupling beam divider; Form slow optical wave guide through translation W1 waveguide both sides first emptying pore and the radius that changes first, second emptying pore; The slower rays energy band diagram is carried out emulation; Handle the group index curve that simulation result can obtain waveguide, thereby the group velocity that explanation 1550nmTE light is propagated is slack-off in waveguide.Article two, curved waveguide constitutes the coupling part, and its field pattern and transmission spectrum are carried out emulation, and it is good at the transmission performance of 1550nm wave band from the result, to analyze curved waveguide, can realize connecting the purpose of integrated device front and back module.At last whole field pattern of microwave photon filter and transmission spectrum are carried out emulation; Through observation TE light in wave filter transmission course and at the Frequency Response of delivery outlet; The proof wave filter has FSR and the above notch depth of 10dB of 60GHz, can be applied in the 60GHzRoF system.
The object of the invention can be realized through following measure:
A kind of microwave photon filter implementation method based on photonic crystal, wherein:
Focused Ion beam) or EBL (beamwriter lithography erosion: etching making piecemeal E-Beam Lithography) this photonic crystal microwave photon filter device is based on that triangular crystal lattice 2 D photon crystal waveguiding structure realizes, wherein the 2 D photon crystal waveguiding structure can pass through FIB (FIB:.
Saidly can realize that the integrated device of microwave photon notch filter function is to be made up of coupling beam divider, curved waveguide structure and slow optical wave guide.To be
a be the grating constant of triangular crystal lattice photonic crystal to the width of waveguide in these devices.Grating constant value a=350nm, airport radius r=123nm, the refractive index n of background material Si=3.4.
Said coupling beam divider structure Design can be accomplished through adjustment coupling regime airport radius.Adjustment coupling regime airport radius can reduce coupling regime length when realizing 1550nm wave band light wave single mode transport, effectively reduce device size thereby carry.
Said slow optical wave guide is to obtain through translation W1 waveguide both sides first emptying pore and the radius that changes first, second emptying pore.The size that wherein changes preceding two emptying pores can make the guided mode translation, is embodied in that first row's radius is more little, second row's radius is big more, and guided mode is translation more upwards, thereby realization is directed against the slower rays function of different frequency range light wave.Consider between slow optical wave guide and the simple W1 waveguide to have pattern differentials, the present invention uses the conical gradual change structure to improve pattern match.The effect of conical gradual change waveguide is inserts the intermediate structure that gradually changes between bigger slow optical wave guide of textural difference and W1 waveguide, thereby light spread modes is changed gradually.Can obviously observe the improvement of transmissison characteristic the field pattern before and after using.
Said curved waveguide structure Design designs completion through three aspects, that is: one is respectively to increase an airport at turning, two 60 ° of angles; The 2nd, the special air hole site is outwards moved along the axis of symmetry direction in three knees of waveguide; The 3rd, the radius of change knee airport.
Compare the present invention with classic method following advantage arranged:
Mentioned a kind of microwave photon filter implementation method based on photonic crystal is directly on a 2 D photon crystal flat board, to accomplish among the present invention; Through designing dull and stereotyped radius and position of going up airport, need not splicing and can directly realize 1550nm wave band TE light notch filter function.
Compare with the traditional microwave photon filter; The present invention has that the photonic crystal volume is little, loss is low, low in energy consumption, advantage such as the light field locality is good; Especially volume little aspect; Compare with the fiber optic loop lag line with the silicon ring of general use, the group index of lag line of the present invention is much larger than silicon (3.4) or optical fiber (1.42).The filter delay line of the present invention design only has 1/50 of the silicon ring that produces equal time delay or fiber optic loop length, has reduced device volume greatly.(document 13 as indicated, L.Ferrier, P.Rojo Romeo with similar photonic crystal integrated device; X.Letartre; E.Drouard and P.Viktorovitch, " 3D integration of photonic crystal devices:vertical coupling with a silicon waveguide " .Optics Express, 2010) compare; The present invention also has following several advantage: 1. in the coupling beam divider of the present invention's design; Only change the radius in coupled waveguide zone, do not changed the shape of airport, reduced manufacture difficulty; 2. the present invention can make the guided mode translation through changing the radius and the position of the preceding two emptying pores in waveguide both sides, thereby changes the working frequency range of device, has increased the dirigibility of device usable range; 3. the coupling beam divider of the present invention's design has identical grating constant and material substrate with the slower rays structure, makes it can on same flat board, utilize the direct etchings of method such as EBL, need not splicing, helps the application of device in PIC.
Principle of the present invention is following:
A kind of microwave photon filter implementation method based on photonic crystal is based on triangular crystal lattice 2 D photon crystal waveguide realization among the present invention.It realizes that principle is: Port1 gets into integrated device to 1550nmTE light from the entrance port; Owing to the coupling between two W1 waveguides; After through the waveguide-coupled effect, directly from outlet Port3 output, another part then gets into down going channel Port4 to a TE light part.In order to utilize beam splitting TE light afterwards, after Port 4, add the curved waveguide structure, through the correlation parameter of adjustment curved waveguide, increase TE optical transmission rate.TE light gets into slow optical wave guide through the curved waveguide structure, because the slower rays coupling significantly reduces the group velocity of transmission light, thereby realizes very strong slow light effect.The exit of slow optical wave guide is added with the curved waveguide same with the porch, and the light that will pass through the slower rays coupling is introduced 2 mouthfuls of the Port of coupling beam divider again, continues beam splitting.So through unlimited circulation, finally the spectrogram at Light Out port reflects the notch filter characteristic.
Description of drawings
Below each photonic crystal exclusive or logic gate structural parameters of being got of figure all with embodiment in identical.
Fig. 1 is a kind of microwave photon filter implementation method model synoptic diagram based on photonic crystal, has wherein comprised three parts: photon crystal coupled beam splitter (PC-Coupler), photonic crystal lag line (PC-Delayline) and 180 ° of U type curved waveguides.Light In is the input port, and Light Out is a delivery outlet.Photonic crystal is silica-based two-dimentional triangular crystal lattice airport structure, grating constant a=350nm, normal air pore radius r=0.35a, the refractive index n of medium silicon
Si=3.4.
Fig. 2 is the structural model synoptic diagram of photon crystal coupled beam splitter; Wherein comprised two W1 waveguides, duct width is
an emptying pore at interval between two waveguides.The radius r r=0.30a of the red airport of coupling regime.Port 1 is the entrance port, and TE light is exported along Port3 through a beam splitting part, and another part gets into curved waveguide through Port4.
The last figure of Fig. 3 is the energy band diagram in the TE optically-coupled beam splitter when utilizing the rr=0.30a that plane wave expansion method obtains, and figure below is the output port transmission spectrum that utilizes the FDTD algorithm to obtain.
Fig. 4 is the slow optical wave guide structural representation, and is as shown in the figure, slow optical wave guide be with the W1 waveguide both sides first emptying pore to right translation Δ x=0.1a, lining moves Δ y=0.17a in waveguide; The first emptying pore radius is reduced to r1=0.8r, and it is r2=1.1r that the second emptying pore increases.
Fig. 5 is the group index n of TE light in slow optical wave guide
gCurve map, horizontal ordinate are the wavelength of resonance frequency, the group index n that the curve representation different wave length is corresponding
g
Fig. 6 is 180 ° of curved waveguide structural representations, and the little figure in left side is the enlarged drawing of 60 ° of curved waveguides.In order to increase TE optical transmission rate, respectively increase an airport in two turning points of 60 ° of curved waveguides, and each moves 0.15a along the direction of arrow in vertical and horizontal direction with 2 blue airports, the radius r x=0.36a of blue airport.Red airport radius is changed into ry=0.38a, and to waveguide outside translation 0.1a.
Fig. 7 is the field pattern of curved waveguide.
Fig. 8 is the synoptic diagram of slow optical wave guide taper coupled structure.Painted airport left side is common W1 waveguide, and the right side is a slow optical wave guide, and painted areas airport characteristic is gradually varied to slow optical wave guide according to linear rule by common waveguide.Be embodied in: the radius of per from left to right two adjacent red airports successively decreases with difference 0.03a/5, simultaneously with red airport along the waveguide level to the right with the vertical downward direction translation, adjacent vacant pore translation spacing is respectively Δ x/5 and Δ y/5; The radius of blue airport then increases progressively according to difference 0.03a/5 from left to right.
Fig. 9 is the TE light field figure that slow optical wave guide adds taper coupled structure front and back, and last figure is the field pattern that does not add pyramidal structure, and contrast can know that the taper coupled structure can significantly improve coupling efficiency, reduces modal dispersion up and down.
Figure 10 is the transmission spectrum that microwave photon filter is measured at Light Out place, and red dotted line is the transmission spectrum that FDTD calculates, and blue curve is the transmission spectrum that utilizes formula to draw.
Figure 11 is the field pattern of microwave photon filter different time.
Figure 12 is the synoptic diagram that microwave photon filter (MPF) is used in 60GHz light-carried wireless system, and the double-sideband signal that is produced by modulator has generated single sideband singal afterwards through MPF filtering.
Embodiment
Microwave photon filter construction based on photonic crystal is as shown in Figure 1.The silica-based two-dimentional triangular crystal lattice airport structure that this structure is used, grating constant a=350nm, normal air pore radius r=0.35a, the refractive index n of medium silicon
Si=3.4.Wherein comprise two major parts: coupling beam divider (PC Coupler) and slow optical wave guide lag line (PC Delay-line), and connect this two-part 180 ° of U type curved waveguides.1550nm TE mould narrow band light is from the input of Light In mouth, and through the filter action of narrow band filter, from the output of Light Out mouth, transmission spectrum shows the spectral characteristic of FSR=60GHz, notch depth 10dB.
Fig. 2 is the structural model synoptic diagram of photon crystal coupled beam splitter; Two W1 waveguides have wherein been comprised; Duct width is
between two a waveguides emptying pore, the radius r r=0.30a of airport at interval at interval.TE light is from Port 1 input, and a part is from Port 3 outputs, another part then because of the waveguide-coupled principle from Port 4 outputs, and get into the slow optical wave guide lag line through U type curved waveguide, the elapsed time is along Port 2 salty new entering coupling beam dividers after the delay of T.The light intensity of four ports of coupling beam divider meets formula:
E wherein
iThe field intensity of expression Port i port; R representes the energy loss of TE light through a coupling beam divider; K is the coupling constant of coupling beam divider, and physical significance is the ratio that accounts for all output intensities along the TE light of a W1 waveguide input through the light intensity of another W1 waveguide of coupling beam divider entering; δ representes the loss that curved waveguide and slower rays lag line cause; β is the propagation constant of light wave in slow optical wave guide, can pass through β=2 π fn
g/ c calculates, and f is the frequency of radiofrequency signal, n
gBe the slow optical wave guide group index, c is the speed of light in vacuum; L is the length of slow optical wave guide.Can obtain the transmissison characteristic of microwave photon filter according to formula 1-3, that is:
Therefore in order to understand the transmissison characteristic of microwave photon filter, we only need to confirm r, k, δ, n
g, five parameters of L.
At first confirm parameter r and k, as the radius that reduces airport between the two row W1 waveguides increases stiffness of coupling, thereby reduce loss through adjustment coupling beam divider structure.Through repeatedly debugging, the present invention confirms as 34a with the length of beam splitter, and waveguide intermediate air pore radius is confirmed as 0.30a.Fig. 3 is the measurement result of coupling beam divider: last figure is the energy band diagram of coupling beam divider; Normalized frequency 0.226 corresponding input wavelength 1550nm; As can be seen from the figure there are two guided modes in the 0.226 frequency range waveguide; These two guided modes exist wave vector poor, just produce the waveguide-coupled effect just because of the existence of wave vector difference; Figure below is the transmission spectrum of Port 3 and Port 4, and as can be seen from the figure the transmissivity of Port 3 at the 1550nm place is 0.564, and 4 of Port are 0.346.So the loss r=1-(0.564+0.346)=0.09 of coupling beam divider, k=0.346/ (0.564+0.346)=0.38.
Next confirm the group index of TE light in the slow optical wave guide lag line.As shown in Figure 4, the correlation parameter of adjustment waveguide both sides airport can significantly increase slower rays efficient, thereby reduces device size.Parameter adjustment is embodied in: the both sides first emptying pore radius is reduced to 80% of normal air pore radius, i.e. 0.28a is simultaneously to right translation 0.1a, to 10% of the inboard translation duct width of waveguide, i.e. 0.14a; The both sides second emptying pore radius increased be 1.1 times of the normal air pore radius, be i.e. 0.385a.Group index and wavelength relationship figure after the adjustment are as shown in Figure 5, can draw adjustment slow optical wave guide parameter from Fig. 5 and can significantly improve group index, the group index n that finally obtains
g=111.Because the notch filter that the present invention makes need be applied to the unnecessary sideband of filtering in the 60GHz RoF system, thus the free spectral range FSR of wave filter to should be the double-side band frequency range slightly wide, the present invention confirms as 130GHz with FSR.According to FSR=c/n
gL and grating constant, the length L of slow optical wave guide lag line is confirmed as 59a.
Connect coupling beam divider and slow optical wave guide lag line through 180 ° of U type curved waveguides then.The structure of curved waveguide is as shown in Figure 6; In order to increase TE optical transmission rate; Two turning points at 60 ° of curved waveguides respectively increase an airport, and each moves 0.15a along the direction of arrow in vertical and horizontal direction with 2 blue airports, the radius r x=0.36a of blue airport.Red airport radius is changed into ry=0.38a, and to waveguide outside translation 0.1a.Utilize the FDTD algorithm that curved waveguide is carried out emulation, as can beappreciated from fig. 7 TE light transmits in curved waveguide well.Because 1550nmTE light is in the edge of slow optical wave guide cutoff frequency, there is the pattern mismatch problem between slow optical wave guide and the common W1 waveguide simultaneously.Therefore need increase the transmissison characteristic that pyramidal structure is improved waveguide in the waveguide both sides.Pyramidal structure is as shown in Figure 8, and painted airport left side is common W1 waveguide, and the right side is a slow optical wave guide, and painted areas airport characteristic is gradually varied to slow optical wave guide according to linear rule by common waveguide.Be embodied in: the semidiameter of per from left to right two adjacent red airports is 0.03a/5, simultaneously with red airport along waveguide level and vertical direction translation, adjacent vacant pore translation spacing is respectively Δ x/5 and Δ y/5; The radius of blue airport then successively decreases according to difference 0.03a/5 from left to right.Utilize the FDTD algorithm simulating equally, simulation result is as shown in Figure 9: last figure is the field pattern that does not add tapered transmission line, can see that 1550nmTE light local is difficult to introduce common waveguide in slow optical wave guide; Figure below then is to increase tapered transmission line field pattern afterwards, from figure, can see that transmissison characteristic is significantly improved.
At last the overall permanence of microwave filter is analyzed.Shown in figure 10; Red curve is the transmission spectrum that FDTD calculates; Blue curve is the transmission spectrum that utilizes formula to draw; Red curve and blue curve are represented that FDTD calculates and the spectral characteristic output terminal Light Out that utilizes formula to draw respectively, coincide each other between the two, show FSR=130GHz, the above trap characteristic of notch depth 10dB.When importing light source is the 1550nmTE light time, and the electric field space distribution plan of different time is shown in figure 11.This wave filter is adapted at 60GHz RoF system and uses, and shown in figure 12, wave filter can the unnecessary sideband of filtering.
In sum, the present invention has designed a kind of microwave photon filter implementation method based on photonic crystal.The present invention on a photonic crystal, utilize 180 ° of U type curved waveguides integrated coupling beam divider and slow optical wave guide lag line; Be formed on 1550nm wave band FSR=130GHz; The notch filter that notch depth 10dB is above can obtain good application in the 60GHz in future light-carried wireless system.
Claims (5)
1. microwave photon filter implementation method based on photonic crystal; Wherein: this microwave photon filter is based on triangular crystal lattice airport structure fabrication, i.e. airport silicon medium background, and wherein the refractive index of silicon is 3.4; Grating constant a=350nm, normal air pore radius r=0.35a.
2. microwave photon filter according to claim 1 it is characterized in that wave filter is made up of the coupling beam divider on same substrate and slow optical wave guide lag line two parts, and two parts is connected by 180 ° of U type curved waveguides.
3. microwave photon filter according to claim 1; The concrete method for designing that it is characterized in that photonic crystal slow optical wave guide lag line; Slow optical wave guide in this programme is to form through radius and the position of regulating W1 waveguide (taking out the waveguide that perfect photonic crystal one emptying pore forms) first, second emptying pore of both sides, and the group index of slow optical wave guide reaches 111.
4. microwave photon filter according to claim 1; The concrete method for designing that it is characterized in that 80 ° of U types of photon crystal 1 curved waveguide; Curved waveguide in this programme is quantity, radii size and the position through change knee airport, thereby realizes the transmission of 1550nm TE light.
5. microwave photon filter according to claim 1 is characterized in that the free spectral range of wave filter is designed to 130GHz, and notch depth can be applicable to the unnecessary sideband of 60GHz light-carried wireless system filtering more than 10dB.
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